| 摘要 |
PROBLEM TO BE SOLVED: To prevent influences of non-linear operations caused by detection gains of distorted wave components at the time when a distorted wave compensation voltage is generated and a waveform compensation power supply while keeping a DC side capacitor voltage of a series inverter constant, when generating the distorted wave compensation voltage at the series inverter for the purpose of waveform improvement of a distorted wave voltage source.SOLUTION: A method of controlling a voltage source active filter is provided. In the voltage source active filter, an inverter circuit 2 and a passive filter circuit 3 are connected between a distorted wave voltage source 1 and a load 4 to generate a compensation voltage for cancelling harmonic component voltages of the distorted wave voltage source 1 at an AC side of the inverter circuit 2. A series inverter is connected to the distorted wave voltage source 1, and distorted wave components included in a load terminal voltage are detected to obtain a distorted wave compensation signal so that no distorted wave component appears in an output voltage waveform. The series inverter is PWM-controlled by a signal obtained by adding a DC voltage control signal proportional to a fundamental wave component of the load terminal voltage so that a DC voltage of the series inverter accords with a predetermined reference value. |
