A pre-charge control method for a hybrid multilevel power converter comprises steps of: (a) controlling access of the current-limiting resistor unit, limiting current from the AC power via the current-limiting resistor unit, and outputting the current; (b) controlling the second capacitor unit to by
A pre-charge control method for a hybrid multilevel power converter comprises steps of: (a) controlling access of the current-limiting resistor unit, limiting current from the AC power via the current-limiting resistor unit, and outputting the current; (b) controlling the second capacitor unit to bypass, and charging the first capacitor unit; (c) controlling the access of the second capacitor unit when the first capacitor unit is charged to a third preset voltage, and charging the first and second capacitor units at the same time; (d) controlling the first capacitor unit to bypass when the second capacitor unit is charged to a fourth preset voltage, or the first capacitor unit is charged to a first preset voltage, and charging the second capacitor unit; and (e) controlling the access of the first capacitor units and the current-limiting resistor unit to bypass when the second capacitor unit is charged to a second preset voltage.
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1. A pre-charge control method for a hybrid multilevel power converter, wherein the hybrid multilevel power converter comprises a first converter, a second converter and a current-limiting resistor unit, the first converter comprises three H-bridge modules, each of the three H-bridge modules compris
1. A pre-charge control method for a hybrid multilevel power converter, wherein the hybrid multilevel power converter comprises a first converter, a second converter and a current-limiting resistor unit, the first converter comprises three H-bridge modules, each of the three H-bridge modules comprises at least one H-bridge circuit, each the H-bridge circuit comprises a first capacitor unit, and the second converter comprises a second capacitor unit, wherein the three H-bridge modules are electrically connected with the second converter, and the three H-bridge modules are connected with the AC power by the current-limiting resistor unit, the pre-charge control method comprising steps of: (a) controlling the access of the current-limiting resistor unit, and limiting a current outputted from the AC power via the current-limiting resistor unit, and outputting the current;(b) controlling the second capacitor unit to bypass, and charging the first capacitor unit using the current;(c) controlling the access of the second capacitor unit when the first capacitor unit is charged to a third preset voltage, and allowing the current to charge the first capacitor unit and the second capacitor unit at the same time;(d) controlling the first capacitor unit to bypass when the second capacitor unit is charged to a fourth preset voltage or the first capacitor unit is charged to a first preset voltage, and charging the second capacitor unit using the current; and(e) controlling the access of the first capacitor unit and the current-limiting resistor unit to bypass when the second capacitor unit is charged to a second preset voltage. 2. The pre-charge control method according to claim 1, wherein the current-limiting resistor unit includes three current-limiting circuits, and each of three current-limiting circuits comprises a first switch, a second switch and a resistor unit, wherein the second switch is connected in parallel with the resistor unit to form a parallel branch, and the parallel branch is connected in series with the first switch; wherein the step (a) further comprises the step of: controlling the first switch of each of three current-limiting circuits to turn on and the second switch of each of three current-limiting circuits to turn off respectively for performing the access of the resistor unit of each of three current-limiting circuits, and limiting the current via the resistor unit of each of three current-limiting circuits,wherein the step (e) further comprises step of: controlling the second switch of each of three current-limiting circuits to turn on for bypassing the resistor unit of each of three current-limiting circuits. 3. The pre-charge control method according to claim 1, wherein the current-limiting resistor unit includes three current-limiting circuits, and each of three current-limiting circuits comprises a third switch, a fourth switch and a resistor unit, and the fourth switch is connected in series with the resistor unit to form a series branch, and the series branch is connected in parallel with the third switch; wherein the step (a) further comprises step of: controlling the fourth switch of each of three current-limiting circuits to turn on and the third switch of each of three current-limiting circuits to turn off respectively for performing the access of the resistor unit of each of three current-limiting circuits, and limiting the current via the resistor unit of each of three current-limiting circuits,wherein the step (e) further comprises step of: controlling the third switch of each of three current-limiting circuits to turn on for bypassing the resistor unit of each of three current-limiting circuits. 4. The pre-charge control method according to claim 1, wherein the second converter is a two-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of three bridge legs comprises an upper leg including a two-level first switch unit and a lower leg including a two-level second switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the two-level first switch units of the second converter to turn on, controlling the two-level second switch units of the second converter to turn on, or controlling the two-level first switch units and the two-level second switch units of the second converter to alternately turn on so as to bypass the second capacitor unit, wherein the step (d) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to alternately turn on for bypassing the first capacitor unit. 5. The pre-charge control method according to claim 4, further comprising the step of: (f) performing the close-loop control to control the two-level first switch units and the two-level second switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 6. The pre-charge control method according to claim 5, wherein the ratio of the first preset voltage to the first rated voltage is ranged from 0.5 to 0.9, and the ratio of the second preset voltage to the second rated voltage is ranged from 0.5 to 0.9. 7. The pre-charge control method according to claim 5, wherein the ratio of the first preset voltage to the first rated voltage is equal to the ratio of the second preset voltage to the second rated voltage. 8. The pre-charge control method according to claim 1, wherein the second converter is a three-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of three bridge legs comprises an upper leg including a three-level first switch unit and a three-level second switch unit and a lower leg including a three-level third switch unit and a three-level fourth switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit, wherein the step (b) further comprises step of: controlling the three-level first switch units and the three-level second switch units of the second converter to turn on, controlling the three-level third switch units and the three-level fourth switch units of the second converter to turn on, controlling the three-level second switch units and the three-level third switch units of the second converter to turn on, or controlling at least two groups including the group of the three-level first switch units and the three-level second switch units of the second converter, the group of the three-level third switch units and the three-level fourth switch units of the second converter and the group of the three-level second switch units and the three-level third switch units of the second converter to alternately turn on so as to bypass the second capacitor unit, wherein the step (d) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to alternately turn on for bypassing the first capacitor unit. 9. The pre-charge control method according to claim 8, further comprising the step of: (f) performing the close-loop control to control the three-level first switch units, the three-level second switch units, the three-level third switch units and the three-level fourth switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 10. The pre-charge control method according to claim 9, wherein the ratio of the first preset voltage to the first rated voltage is ranged from 0.5 to 0.9, and the ratio of the second preset voltage to the second rated voltage is ranged from 0.5 to 0.9. 11. The pre-charge control method according to claim 9, wherein the ratio of the first preset voltage to the first rated voltage is equal to the ratio of the second preset voltage to the second rated voltage. 12. A pre-charge control method for a hybrid multilevel power converter, wherein the hybrid multilevel power converter comprises a first converter, a second converter and a current-limiting resistor unit, the first converter comprises three H-bridge modules, each of the three H-bridge modules comprises at least one H-bridge circuit, each H-bridge circuit comprises a first capacitor unit, and the second converter comprises a second capacitor unit, wherein the three H-bridge modules are electrically connected with the second converter, and the three H-bridge modules are connected with the AC power by the current-limiting resistor unit, the pre-charge control method comprising steps of: (a) controlling the access of the current-limiting resistor unit, and limiting a current outputted from the AC power via the current-limiting resistor unit, and outputting the current;(b) controlling the second capacitor unit to bypass, and charging the first capacitor unit using the current;(c) controlling the access of the second capacitor unit when the first capacitor unit is charged to a fifth preset voltage, and allowing the current to charge the first capacitor unit and the second capacitor unit at the same time;(d) controlling the first capacitor unit to bypass periodically when the second capacitor unit is charged to a sixth preset voltage or the first capacitor unit is charged to a seventh preset voltage, and allowing the current to charge the first capacitor unit and the second capacitor unit; and(e) controlling the access of the first capacitor unit and the current-limiting resistor unit to bypass when the second capacitor unit is charged to a second preset voltage or the first capacitor unit is charged to a first preset voltage. 13. The pre-charge control method according to claim 12, wherein the second converter is a two-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of three bridge legs comprises an upper leg including a two-level first switch unit and a lower leg including a two-level second switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the two-level first switch units of the second converter to turn on, controlling the two-level second switch units of the second converter to turn on, or controlling the two-level first switch units and the two-level second switch units of the second converter to alternately turn on so as to bypass the second capacitor unit, wherein the step (d) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on periodically, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on periodically, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to periodically and alternately turn on for bypassing the first capacitor unit. 14. The pre-charge control method according to claim 13, further comprising the step of: (f) performing the close-loop control to control the two-level first switch units and the two-level second switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 15. The pre-charge control method according to claim 12, wherein the second converter is a three-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of the three bridge legs comprises an upper leg including a three-level first switch unit and a three-level second switch unit and a lower leg including a three-level third switch unit and a three-level fourth switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the three-level first switch units and the three-level second switch units of the second converter to turn on, controlling the three-level third switch units and the three-level fourth switch units of the second converter to turn on, controlling the three-level second switch units and the three-level third switch units of the second converter to turn on, or controlling at least two groups including the group of the three-level first switch units and the three-level second switch units of the second converter, the group of the three-level third switch units and the three-level fourth switch units of the second converter and the group of the three-level second switch units and the three-level third switch units of the second converter to alternately turn on so as to bypass the second capacitor unit, wherein the step (d) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on periodically, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on periodically, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to periodically and alternately turn on for bypassing the first capacitor unit. 16. The pre-charge control method according to claim 15, further comprising the step of: (f) performing the close-loop control to control the three-level first switch units, the three-level second switch units, the three-level third switch units and the three-level fourth switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 17. A pre-charge control method for a hybrid multilevel power converter, wherein the hybrid multilevel power converter comprises a first converter, a second converter and a current-limiting resistor unit, the first converter comprises three H-bridge modules, each of the three H-bridge modules comprises at least one H-bridge circuit, each H-bridge circuit comprises a first capacitor unit, and the second converter comprises a second capacitor unit, wherein the three H-bridge modules are electrically connected with the second converter, and the three H-bridge modules are connected with the AC power by the current-limiting resistor unit, the pre-charge control method comprising steps of: (a) controlling the access of the current-limiting resistor unit, and limiting a current outputted from the AC power via the current-limiting resistor unit, and outputting the current;(b) controlling the first capacitor unit to bypass, and charging the second capacitor unit using the current;(c) controlling the access of the first capacitor unit when the second capacitor unit is charged to an eighth preset voltage, and allowing the current to charge the first capacitor unit and the second capacitor unit at the same time;(d) controlling the second capacitor unit to bypass when the first capacitor unit is charged to a ninth preset voltage or the second capacitor unit is charged to a second preset voltage, and charging the first capacitor unit using the current; and(e) controlling the access of the second capacitor unit and the current-limiting resistor unit to bypass when the first capacitor unit is charged to a first preset voltage. 18. The pre-charge control method according to claim 17, wherein the second converter is a two-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of three bridge legs comprises an upper leg including a two-level first switch unit and a lower leg including a two-level second switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to alternately turn on for bypassing the first capacitor unit, wherein the step (d) further comprises step of: controlling the two-level first switch units of the second converter to turn on, controlling the two-level second switch units of the second converter to turn on, or controlling the two-level first switch units of the second converter and the two-level second switch units of the second converter to alternately turn on so as to bypass the second capacitor unit. 19. The pre-charge control method according to claim 18, further comprising the step of: (f) performing the close-loop control to control the two-level first switch units and the two-level second switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 20. The pre-charge control method according to claim 18, wherein the second converter is a three-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of the three bridge legs comprises an upper leg including a three-level first switch unit and a three-level second switch unit and a lower leg including a three-level third switch unit and a three-level fourth switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to alternately turn on for bypassing the first capacitor unit, wherein the step (d) further comprises step of: controlling the three-level first switch units and the three-level second switch units of the second converter to turn on, controlling the three-level third switch units and the three-level fourth switch units of the second converter to turn on, controlling the three-level second switch units and the three-level third switch units of the second converter to turn on, or controlling at least two groups including the group of the three-level first switch units and the three-level second switch units of the second converter, the group of the three-level third switch units and the three-level fourth switch units of the second converter and the group of the three-level second switch units and the three-level third switch units of the second converter to alternately turn on so as to bypass the second capacitor unit. 21. The pre-charge control method according to claim 20, further comprising the step of: (f) performing the close-loop control to control the three-level first switch units, the three-level second switch units, the three-level third switch units and the three-level fourth switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 22. A pre-charge control method for a hybrid multilevel power converter, wherein the hybrid multilevel power converter comprises a first converter, a second converter and a current-limiting resistor unit, the first converter comprises three H-bridge modules, each of the three H-bridge modules comprises at least one H-bridge circuit, each H-bridge circuit comprises a first capacitor unit, and the second converter comprises a second capacitor unit, wherein the three H-bridge modules are electrically connected with the second converter, and the three H-bridge modules are connected with the AC power by the current-limiting resistor unit, the pre-charge control method comprising steps of: (a) controlling the access of the current-limiting resistor unit, and limiting a current outputted from the AC power via the current-limiting resistor unit, and outputting the current;(b) controlling the first capacitor unit to bypass periodically, and charging the first capacitor unit and the second capacitor unit using the current;(c) controlling the access of the first capacitor unit when the second capacitor unit is charged to a tenth preset voltage or the first capacitor unit is charged to an eleventh preset voltage, and allowing the current to charge the first capacitor unit and the second capacitor unit;(d) controlling the second capacitor unit to bypass and charging the first capacitor unit using current when the first capacitor unit is charged to a twelfth preset voltage or the second capacitor unit is charged to a second preset voltage; and(e) controlling the access of the second capacitor unit and the current-limiting resistor unit to bypass when the first capacitor unit is charged to a first preset voltage. 23. The pre-charge control method according to claim 22, wherein the second converter is a two-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of three bridge legs comprises an upper leg including a two-level first switch unit and a lower leg including a two-level second switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridge legs comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on periodically, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on periodically, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to periodically and alternately turn on for bypassing the first capacitor unit, wherein the step (d) further comprises step of: controlling the two-level first switch units of the second converter to turn on, controlling the two-level second switch units of the second converter to turn on, or controlling the two-level first switch units and the two-level second switch units of the second converter to alternately turn on so as to bypass the second capacitor unit. 24. The pre-charge control method according to claim 23, further comprising the step of: (f) performing the close-loop control to control the two-level first switch units and the two-level second switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage. 25. The pre-charge control method according to claim 22, wherein the second converter is a three-level inverter, and comprises three bridge legs which are electrically connected in parallel with the second capacitor unit, each of the three bridge legs comprises an upper leg including a three-level first switch unit and a three-level second switch unit and a lower leg including a three-level third switch unit and a three-level fourth switch unit, wherein each of the H-bridge circuits comprises two bridge legs, the two bridge legs are connected in parallel with the first capacitor unit, each of the two bridges comprises an upper leg and a lower leg, wherein one upper leg includes a first H-bridge switch unit and the other upper leg includes a third H-bridge switch unit; and one lower leg includes a second H-bridge switch unit and the other lower leg includes a fourth H-bridge switch unit; wherein the step (b) further comprises step of: controlling the first H-bridge switch units and the third H-bridge switch units of the first converter to turn on periodically, controlling the second H-bridge switch units and the fourth H-bridge switch units of the first converter to turn on periodically, or controlling the group of the first H-bridge switch units and the third H-bridge switch units of the first converter and the group of the second H-bridge switch units and the fourth H-bridge switch units of the first converter to periodically and alternately turn on for bypassing the first capacitor unit, wherein the step (d) further comprises step of: controlling the three-level first switch units and the three-level second switch units of the second converter to turn on, controlling the three-level third switch units and the three-level fourth switch units of the second converter to turn on, controlling the three-level second switch units and the three-level third switch units of the second converter to turn on, or controlling at least two groups including the group of the three-level first switch units and the three-level second switch units of the second converter, the group of the three-level third switch units and the three-level fourth switch units of the second converter and the group of the three-level second switch units and the three-level third switch units of the second converter to alternately turn on so as to bypass the second capacitor unit. 26. The pre-charge control method according to claim 25, further comprising the step of: (f) performing the close-loop control to control the three-level first switch units, the three-level second switch units, the three-level third switch units and the three-level fourth switch units of the second converter, and the first H-bridge switch units, the second H-bridge switch units, the third H-bridge switch units and the fourth H-bridge switch units of the first converter for charging the first capacitor unit to a first rated voltage and charging the second capacitor unit to a second rated voltage.
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Hasler, Jean-Philippe, Arrangement for exchanging power.
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