| 摘要 |
PURPOSE: A parallel control system of a single-phase inverter is provided to minimize the intensity of the circulating current by controlling the current applied to each inverter. CONSTITUTION: A parallel control system of a single-phase inverter includes a first and a second inverter system and a parallel operation control unit(300). The parallel operation control unit(300) includes a first and a second zero crossing circuit(305,310), a DPLL(320), a clock selection circuit(330), a timer(340), an effective power control unit(380), a reactive power controller(350), an output voltage control unit(360), a PWM generator(370), and an IGBT driver(390). The first and the second zero crossing circuits(305,310) are used for converting the first and the second current of the first and the second inverter systems to square waves. The DPLL(320) is used for determining output frequencies of the square waves. The clock selection circuit(330) is used for selecting clocks of the output frequencies. The timer(340) is used for performing a buffering operation to remove the circulation current. The effective power control unit(380) controls the effective power. The reactive power controller(350) controls the reactive power. The output voltage control unit(360) generates a voltage command value by controlling the voltages of the first and the second inverter systems. The PWM generator(370) is used for generating a control signal to operate a first and a second inverter IGBT. The IGBT driver(390) is used for transmitting control signals of the PWM generator to the first and the second inverter IGBTs. |
