초록 ▼

An instantaneous voltage-drop compensation circuit including: a first voltage detector detecting three-phase voltages to be input to a power converter converting three-phase AC to DC based on control pulse signals, and outputting three-phase voltage signals; a first three-phase to two-phase converte

An instantaneous voltage-drop compensation circuit including: a first voltage detector detecting three-phase voltages to be input to a power converter converting three-phase AC to DC based on control pulse signals, and outputting three-phase voltage signals; a first three-phase to two-phase converter converting the detected signals to two-phase voltage signals; a first current detector detecting three-phase currents to be input to the power converter and outputting three-phase current signals; a second three-phase to two-phase converter converting the detected current signals to two-phase current signals; a first subtracter generating a first deviation signal from input current command signals and the two-phase current signals; an input current controller generating input current control signals based on the first deviation signal; and a first adder adding the two-phase voltage signals to the input current control signals, to generate control pulse signals for the power converter.

대표청구항 ▼

What is claimed is: 1. An instantaneous voltage-drop compensation circuit comprising: a first voltage detector which detects three-phase voltages to be input to a power converter and outputs three-phase voltage signals, the converter converting three-phase alternating current to direct current, bas

What is claimed is: 1. An instantaneous voltage-drop compensation circuit comprising: a first voltage detector which detects three-phase voltages to be input to a power converter and outputs three-phase voltage signals, the converter converting three-phase alternating current to direct current, based on control pulse signals; a first three-phase to two-phase converter which converts the detected three-phase voltage signals to two-phase voltage signals; a first current detector which detects three-phase currents to be input to the power converter and outputs three-phase current signals; a second three-phase to two-phase converter which converts the detected three-phase current signals to two-phase current signals; a first subtracter which generates a first deviation signal from input current command signals and the two-phase current signals; an input current controller which generates input current control signals based on the first deviation signal; a first adder which adds the two-phase voltage signals to the input current control signals; a first two-phase to three-phase converter which converts input current control signals, to which the two-phase voltage signals have been added, to three-phase control signals; a control pulse signal generator which generates the control pulse signals for the power converter based on the three-phase control signals and outputs the control pulse signals to the power converter; a positive-phase negative-phase separator which separates the converted two-phase voltage signals into positive-phase components and negative-phase components; a second two-phase to three-phase converter which converts the separated negative-phase components of the two-phase voltage signals to negative-phase components of the three-phase voltage signals; a zero-phase voltage extractor which extracts a zero-phase voltage signal from the detected three-phase voltage signals; and a second adder which adds the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal to the three-phase control signals, wherein the first adder adds the separated positive-phase components of the two-phase voltage signals to the input current control signals, and the control pulse signal generator generates the control pulse signals based on three-phase control signals resulted from the sum of the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal. 2. The instantaneous voltage-drop compensation circuit according to claim 1, further comprising: a second voltage detector which detects a DC voltage output from the power converter and outputs a DC voltage signal; a second subtracter which generates a second deviation signal from a voltage commanding value signal and the DC voltage signal; a DC voltage controller which generates a DC voltage control signal based on the second deviation signal; and an input current command converter which generates the input current command signals based on the DC voltage control signal and the positive-phase components of the two-phase voltage signals. 3. The instantaneous voltage-drop compensation circuit according to claim 2, further comprising: a second current detector which detects a DC current output from the power converter and outputs a DC current signal; a multiplier which multiplies the DC voltage signal by the DC current signal and outputs a DC power signal; and a third adder which adds the DC power signal to the DC voltage control signal, wherein the input current command converter generates the input current command signals based on DC voltage control signal to which the DC power signal has been added, and the positive-phase components of the two-phase voltage signals. 4. The instantaneous voltage-drop compensation circuit according to claim 1, further comprising: a phase voltage extractor which extracts a phase voltage signal from the three-phase voltage signals; and a synchronous signal generator which generates and outputs a synchronous signal from the extracted phase voltage signal, wherein the first three-phase to two-phase converter, the second three-phase to two-phase converter, the first two-phase to three-phase converter and the second two-phase to three-phase converter operate in synchronism with the synchronous signal. 5. The instantaneous voltage-drop compensation circuit according to claim 1, wherein the first voltage detector comprises: a line voltage detector which detects three-phase line voltages to be input to the power converter and outputs three-phase line voltage signals; and a line-to-line phase voltage converter which converts the detected three-phase line voltage signals to three phase voltage signals. 6. A power conversion apparatus comprising: the power converter; and the instantaneous voltage-drop compensation circuit according to claim 1. 7. An instantaneous voltage-drop compensation method comprising: a first voltage detecting step to detect three-phase voltages to be input to a power converter and to output three-phase voltage signals, the converter converting three-phase alternating current to direct current, based on control pulse signals; a first three-phase to two-phase converting step to convert the detected three-phase voltage signals to two-phase voltage signals; a first current detecting step to detect three-phase currents to be input to the power converter and to output three-phase current signals; a second three-phase to two-phase converting step to convert the detected three-phase current signals to two-phase current signals; a first subtracting step to generate a first deviation signal from input current command signals and the two-phase current signals; an input current controlling step to generate input current control signals based on the first deviation signal; a first adding step to add the two-phase voltage signals to the input current control signals; a first two-phase to three-phase converting step to convert input current control signals to which the two-phase voltage signals have been added, to three-phase control signals; a control pulse signal generating step to generate the control pulse signals for the power converter based on the three-phase control signals and to output the control pulse signals to the power converter; a positive-phase negative-phase separating step to separate the converted two-phase voltage signals into positive-phase components and negative-phase components; a second two-phase to three-phase converting step to convert the separated negative-phase components of the two-phase voltage signals to negative-phase components of the three-phase voltage signals; a zero-phase voltage extracting step to extract a zero-phase voltage signal from the detected three-phase voltage signals; and a second adding step to add the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal to the three-phase control signals, wherein in the first adding step, the separated positive-phase components of the two-phase voltage signals are added to the input current control signals, and in the control pulse signal generating step, the control pulse signals are generated based on three-phase control signals resulted from the sum of the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal. 8. The instantaneous voltage-drop compensation method according to claim 7, further comprising: a second voltage detecting step to detect a DC voltage output from the power converter and to output a DC voltage signal; a second subtracting step to generate a second deviation signal from a voltage commanding value signal and the DC voltage signal; a DC voltage control step to generate a DC voltage control signal based on the second deviation signal; and an input current command converting step to generate the input current command signals based on the DC voltage control signal and the positive-phase components of the two-phase voltage signals. 9. The instantaneous voltage-drop compensation method according to claim 8, further comprising: a second current detecting step to detect a DC current output from the power converter and to output a DC current signal; a multiplying step to multiply the DC voltage signal by the DC current signal and to output a DC power signal; and a third adding step to add the DC power signal to the DC voltage control signal, wherein in the input current command converting step, the input current command signals are generated based on DC voltage control signal to which the DC power signal has been added, and the positive-phase components of the two-phase voltage signals. 10. The instantaneous voltage-drop compensation method according to claim 7, further comprising: a phase voltage extracting step to extract a phase voltage signal from the three-phase voltage signals; and a synchronous signal generating step to generate and output a synchronous signal from the extracted phase voltage signal, wherein the first three-phase to two-phase converting step, the second three-phase to two-phase converting step, the first two-phase to three-phase converting step and the second two-phase to three-phase converting step are performed in synchronism with the synchronous signal. 11. The instantaneous voltage-drop compensation method according to claim 7, wherein the first voltage detecting step comprises: a line voltage detecting step to detect three-phase line voltages to be input to the power converter and to output three-phase line voltage signals; and a line-to-line phase voltage converting step to convert the detected three-phase line voltage signals to three phase voltage signals. 12. A computer readable medium storing a program for making a computer perform steps comprising: a first voltage detecting step to detect three-phase voltages to be input to a power converter and to output three-phase voltage signals, the converter converting three-phase alternating current to direct current, based on control pulse signals; a first three-phase to two-phase converting step to convert the detected three-phase voltage signals to two-phase voltage signals; a first current detecting step to detect three-phase currents to be input to the power converter and to output three-phase current signals; a second three-phase to two-phase converting step to convert the detected three-phase current signals to two-phase current signals; a first subtracting step to generate a first deviation signal from input current command signals and the two-phase current signals; an input current controlling step to generate input current control signals based on the first deviation signal; a first adding step to add the two-phase voltage signals to the input current control signals; a first two-phase to three-phase converting step to convert input current control signals, to which the two-phase voltage signals have been added, to three-phase control signals; a control pulse signal generating step to generate the control pulse signals for the power converter based on the three-phase control signals and to output the control pulse signals to the power converter; a positive-phase negative-phase separating step to separate the converted two-phase voltage signals into positive-phase components and negative-phase components; a second two-phase to three-phase converting step to convert the separated negative-phase components of the two-phase voltage signals to negative-phase components of the three-phase voltage signals; a zero-phase voltage extracting step to extract a zero-phase voltage signal from the detected three-phase voltage signals; and a second adding step to add the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal to the three-phase control signals, wherein in the first adding step, the separated positive-phase components of the two-phase voltage signals are added to the input current control signals, and in the control pulse signal generating step, the control pulse signals are generated based on three-phase control signals resulted from the sum of the negative-phase components of the three-phase voltage signals and the zero-phase voltage signal. 13. The computer readable medium according to claim 12, wherein the program further makes the computer perform steps comprising: a second voltage detecting step to detect a DC voltage output from the power converter and to output a DC voltage signal; a second subtracting step to generate a second deviation signal from a voltage commanding value signal and the DC voltage signal; a DC voltage controlling step to generate a DC voltage control signal based on the second deviation signal; and an input current command converting step to generate the input current command signals based on the DC voltage control signal and the positive-phase components of the two-phase voltage signals. 14. The computer readable medium according to claim 13, wherein the program further makes the computer perform steps comprising: a second current detecting step to detect a DC current output from the power converter and to output a DC current signal; a multiplying step to multiply the DC voltage signal by the DC current signal and to output a DC power signal; and a third adding step to add the DC power signal to the DC voltage control signal, wherein in the input current command converting step, the input current command signals are generated based on DC voltage control signal to which the DC power signal has been added, and the positive-phase components of the two-phase voltage signals. 15. The computer readable medium according to claim 12, wherein the program further makes the computer perform steps comprising: a phase voltage extracting step to extract a phase voltage signal from the three-phase voltage signals; and a synchronous signal generating step to generate and output a synchronous signal from the extracted phase voltage signal, wherein the first three-phase to two-phase converting step, the second three-phase to two-phase converting step, the first two-phase to three-phase converting step and the second two-phase to three-phase converting step are performed in synchronism with the synchronous signal. 16. The computer readable medium according to claim 12, wherein the first voltage detecting step comprises: a line voltage detecting step to detect three-phase line voltages to be input to the power converter and to output three-phase line voltage signals; and a line-to-line phase voltage converting step to convert the detected three-phase line voltage signals to three phase voltage signals.