Reactive power compensating apparatus with higher harmonic supressing function

摘要

Higher harmonic power components (P_h, Q_h) and fundamental wave reactive power components (Q_o) are derived from a load voltage (V_S) and current (i_L), using theory (instantaneous p-q theory) regarding instantaneous real power and instantaneous imaginary power. Gains are then obtained which make the higher harmonic power components (P_h, Q_h) and fundamental wave reactive power components (Q_o) not exceed predetermined limit values. The higher harmonic power components (P_h, Q_h) and fundamental wave reactive power components (Q_o) are respectively multiplied by the gains to obtain limited higher harmonic power components (P_h', Q_h') and fundamental wave reactive power components (Q_o'). An output current command is generated in accordance with the limited higher harmonic power components (P_h', Q_h') and fundamental wave reactive power components (Q_o'). The output current command is supplied to an inverter which in turn supplies a compensation current (i_c) to the power system.