| 摘要 |
<p>An apparatus and method for compensating a polyphase electrical power supply for reactive power loads on an AC supply line includes a transistorized inverter (20), connected between the AC supply (24) and a constant voltage (22), that has switches to control the instantaneous current on each phase line of the AC power supply. By modulating the inverter switches at a high frequency, the instantaneous currents flowing through each of the phase lines can be modulated for precise control of the real and the reactive power. A voltage waveform is obtained from each phase of the utility grid, and used as a reference waveform to create two waveforms: a real waveform and an imaginary waveform for each phase. The imaginary waveform is multiplied by a VAR multiplier M1 to supply the desired number of VARs, the real waveform is multiplied by a real multiplier M2 that is derived to control the constant voltage source (22), and resultant waveforms are added together to provide a current control waveform for each phase that is applied to the inverter (20) through a current regulator and drive circuits.</p> |
