IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0214636
(2011-08-22)
|
등록번호 |
US-8513911
(2013-08-20)
|
우선권정보 |
GB-0709094.7 (2007-05-11) |
발명자
/ 주소 |
- Jones, Rodney
- Newton, Christopher
|
출원인 / 주소 |
- Converteam Technology Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
12 |
초록
▼
A power converter that interfaces a motor requiring variable voltage/frequency to a supply network providing a nominally fixed voltage/frequency includes a first rectifier/inverter connected to a stator and a second rectifier/inverter. Both rectifier/inverters are interconnected by a dc link and inc
A power converter that interfaces a motor requiring variable voltage/frequency to a supply network providing a nominally fixed voltage/frequency includes a first rectifier/inverter connected to a stator and a second rectifier/inverter. Both rectifier/inverters are interconnected by a dc link and include switching devices. A filter is connected between the second rectifier/inverter and the network. A first controller for the first rectifier/inverter uses a dc link voltage demand signal indicative of a desired dc link voltage to control the switching devices of the first rectifier/inverter. A second controller for the second rectifier/inverter uses a power demand signal indicative of the level of power to be transferred to the dc link from the network through the second rectifier/inverter, and a voltage demand signal indicative of the voltage to be achieved at network terminals of the filter to control the switching devices of the second rectifier/inverter.
대표청구항
▼
1. A power converter that can be used to interface a motor that requires variable voltage at variable frequency to a supply network providing a nominally fixed voltage and nominally fixed frequency, the power converter comprising: a first active rectifier/inverter electrically connected to a stator
1. A power converter that can be used to interface a motor that requires variable voltage at variable frequency to a supply network providing a nominally fixed voltage and nominally fixed frequency, the power converter comprising: a first active rectifier/inverter electrically connected to a stator of the motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the first controller uses a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal; andwherein the second controller uses a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network. 2. A power converter according to claim 1, wherein the first controller uses a flux demand signal indicative of a desired level of flux to be achieved in the motor to control the semiconductor power switching devices of the first active rectifier/inverter to produce stator electrical quantities that achieve the desired flux in the motor. 3. A power converter according to claim 1, wherein the first controller compares the dc link voltage demand signal indicative of a desired dc link voltage to a dc link voltage feedback signal to determine a torque demand signal indicative of a desired level of torque to be achieved in the motor, and controls the semiconductor power switching devices of the first active rectifier/inverter to produce stator electrical quantities that achieve the desired torque in the motor. 4. A power converter according to claim 1, wherein the first controller supplies a control signal that varies in accordance with the prevailing motor conditions to the second controller and the second controller uses the control signal to limit the level of power that is transferred to the dc link from the supply network through the second active rectifier/inverter. 5. A power converter according to claim 1, wherein the first demand signal is based on a motor demand and the second controller uses the first demand signal to produce desired motor electrical and mechanical quantities. 6. A power converter according to claim 1, wherein the second controller uses the first demand signal to determine a quadrature axis current demand signal for the second active rectifier/inverter indicative of a desired quadrature axis current to be achieved in the supply network, and controls the semiconductor power switching devices of the second active rectifier/inverter to produce filter/supply network electrical quantities that achieve the desired quadrature axis current in the supply network. 7. A power converter according to claim 1, wherein the first demand signal is provided by a controller. 8. A power converter according to claim 7, wherein the controller receives one or more of a power reference, a speed reference, torque reference, and a current reference from a vessel control system. 9. A power converter according to claim 1, wherein the second controller uses the second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to produce desired filter/supply network electrical quantities. 10. A power converter according to claim 1, wherein the second controller uses the second demand signal to determine a direct axis current demand signal for the second active rectifier/inverter, and controls the semiconductor power switching devices of the second active rectifier/inverter to produce filter/supply network electrical quantities that achieve the desired direct axis current in the supply network. 11. A power converter according to claim 10, wherein the second controller modifies the direct axis current demand signal in accordance with the prevailing supply network voltage conditions. 12. A power converter according to claim 1, wherein the second demand signal is provided by a power management system. 13. A power converter according to claim 1, wherein a signal indicative of the supply network power is supplied to the first controller from the second controller. 14. A power converter according to claim 13, wherein the signal indicative of the supply network power is added to the output of a dc link controller in the first controller and used to determine a desired level of torque in the motor. 15. A power converter according to claim 1, further comprising a filter connected between the second active rectifier/inverter and the supply network, the filter including network terminals. 16. An arrangement comprising a plurality of power converters connected to a common supply bus of a supply network providing a nominally fixed voltage and nominally fixed frequency, each power converter comprising: a first active rectifier/inverter electrically connected to a stator of a motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the first controller uses a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal;wherein the second controller uses a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network; andwherein the second demand signal is supplied to the second controller of each power converter from a power management system. 17. An arrangement according to claim 16, wherein each individual power converter includes a step-down transformer electrically connected between the associated filter and the common supply bus. 18. A propulsion unit comprising: a motor having a stator and rotor;a propeller assembly including at least one blade rotated by the rotor of the motor; anda power converter for interfacing the motor to a supply network, the power converter comprising: a first active rectifier/inverter electrically connected to the stator of the motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the first controller uses a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal; andwherein the second controller uses a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network. 19. A marine vessel comprising: a supply network providing a nominally fixed voltage and nominally fixed frequency and having a common supply bus; anda plurality of propulsion units, each propulsion unit comprising a motor having a stator and rotor, a propeller assembly including at least one blade rotated by the rotor of the motor, and a power converter for interfacing the motor to the supply network, the power converter comprising: a first active rectifier/inverter electrically connected to the stator of the motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the first controller uses a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal; andwherein the second controller uses a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network;wherein the respective power converters of the plurality of propulsion units are connected to the common supply bus and wherein the second demand signal is supplied by a power management system. 20. A method of operating a power converter that can be used to interface a motor that requires variable voltage at variable frequency to a supply network providing a nominally fixed voltage and nominally fixed frequency, the power converter comprising: a first active rectifier/inverter electrically connected to a stator of the motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the method comprises the steps of:the first controller using a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal; andthe second controller using a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network. 21. A method according to claim 20, further comprising the step of the first controller using a flux demand signal indicative of a desired level of flux to be achieved in the motor to control the semiconductor power switching devices of the first active rectifier/inverter to produce stator electrical quantities that achieve the desired flux in the motor. 22. A method according to claim 20, further comprising the step of first controller comparing the dc link voltage demand signal indicative of a desired dc link voltage to a dc link voltage feedback signal to determine a torque demand signal indicative of a desired level of torque to be achieved in the motor, and controlling the semiconductor power switching devices of the first active rectifier/inverter to produce stator electrical quantities that achieve the desired torque in the motor. 23. A method according to claim 20, further comprising the steps of the first controller supplying a control signal that varies in accordance with the prevailing motor conditions to the second controller and the second controller using the control signal to limit the level of power that is transferred to the dc link from the supply network through the second active rectifier/inverter. 24. A method according to claim 20, wherein the first demand signal is based on a motor demand and further comprising the step of the second controller using the first demand signal to produce desired motor electrical and mechanical quantities. 25. A method according to claim 20, further comprising the step of the second controller using the first demand signal to determine a quadrature axis current demand signal for the second active rectifier/inverter indicative of a desired quadrature axis current to be achieved in the supply network, and controlling the semiconductor power switching devices of the second active rectifier/inverter to produce filter/supply network electrical quantities that achieve the desired quadrature axis current in the supply network. 26. A method according to claim 20, wherein the first demand signal is provided by a controller. 27. A method according to claim 26, further comprising the step of the controller receiving one or more of a power reference, a speed reference, a torque reference, and a current reference from a vessel control system. 28. A method according to claim 20, further comprising the step of the second controller using the second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to produce desired filter/supply network electrical quantities. 29. A method according to claim 20, further comprising the step of the second controller using the second demand signal to determine a direct axis current demand signal for the second active rectifier/inverter, and controlling the semiconductor power switching devices of the second active rectifier/inverter to produce filter/supply network electrical quantities that achieve the desired direct axis current in the supply network during a supply network voltage dip situation. 30. A method according to claim 29, wherein the second controller modifies the direct axis current demand signal in accordance with the prevailing supply network voltage conditions during a supply network voltage dip situation. 31. A method according to claim 20, wherein the second demand signal is provided by a power management system. 32. A method according to claim 20, further comprising the step of supplying a signal indicative of the supply network power to the first controller from the second controller. 33. A method according to claim 32, wherein the signal indicative of the supply network power is added to the output of a dc link controller in the first controller and used to determine a desired level of torque in the motor. 34. A method of operating a plurality of power converters connected to a common supply bus of a supply network providing a nominally fixed voltage and nominally fixed frequency, each power converter comprising: a first active rectifier/inverter electrically connected to a stator of a motor and including a plurality of semiconductor power switching devices;a second active rectifier/inverter electrically connected to the supply network and including a plurality of semiconductor power switching devices;a dc link connected between the first active rectifier/inverter and the second active rectifier/inverter;a first controller for the first active rectifier/inverter; anda second controller for the second active rectifier/inverter;wherein the first controller uses a dc link voltage demand signal indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal;wherein the second controller uses a first demand signal to control the semiconductor power switches of the second active rectifier/inverter to control the level of real power to be transferred into and out of the dc link through the second active rectifier/inverter, and a second demand signal to control the semiconductor power switching devices of the second active rectifier/inverter to control the level of reactive power and/or ac voltage at the supply network;the method comprising the step of supplying the second demand signal to the second controller of each power converter from a power management system.
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