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    • 4. 发明授权
    • Active power conditioner for reactive and harmonic compensation having
PWM and stepped-wave inverters
    • 有功功率调节器,用于具有PWM和阶跃波逆变器的无功和谐波补偿
    • US5751138A
    • 1998-05-12
    • US667924
    • 1996-06-20
    • Subrahmanyam S. VenkataN. Ravisekhar RajuRaxit A. KagalwalaVedula V. Sastry
    • Subrahmanyam S. VenkataN. Ravisekhar RajuRaxit A. KagalwalaVedula V. Sastry
    • H02J3/01H02J3/18G05F1/70H02M1/12
    • H02M5/4585H02J3/01H02J3/1842Y02E40/22Y02E40/40
    • An active power quality conditioner for compensating reactive power and harmonic distortion in power systems. A pulse width modulated (PWM) inverter (70) for each phase is controlled to produce a harmonic distortion compensation signal that is coupled to an inductor. The inductor is connected in series between a stepped-wave inverter (84) and one phase of the power line. A current produced by the stepped-wave inverter compensates for the reactance of a load coupled to the power line. The PWM inverter operates at a frequency that is substantially greater than the fundamental frequency of the power line and is not exposed to the full power line voltage; it can be constructed using components of relatively low power and voltage rating. In contrast, the stepped-wave inverter, which is decoupled from the PWM inverter, operates at the fundamental frequency and is subjected to most of the stress. Both shunt coupled and series coupled compensators are described. Compensation for an unbalanced load is provided using a compensator (364) that includes a 24-pulse stepped-wave inverter (366).
    • 一种有源电力质量调节器,用于补偿电力系统中的无功功率和谐波失真。 控制用于每相的脉冲宽度调制(PWM)逆变器(70)以产生耦合到电感器的谐波失真补偿信号。 电感器串联连接在阶梯式逆变器(84)和电力线的一相之间。 由阶梯波逆变器产生的电流补偿耦合到电力线的负载的电抗。 PWM逆变器以基本上大于电力线的基频的频率工作,并且不暴露于全电源线电压; 它可以使用相对低功率和额定电压的组件来构造。 相比之下,与PWM逆变器分离的阶跃式逆变器工作在基频,并受到大部分的应力。 描述了并联耦合和串联耦合补偿器。 使用包括24脉冲阶梯波逆变器(366)的补偿器(364)来提供不平衡负载的补偿。