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发明公开
CN104868774A LCL与多LC支路相结合的并网逆变器及电流控制方法 无效 - 驳回

LCL与多LC支路相结合的并网逆变器及电流控制方法
摘要：
本发明公开了一种LCL与多LC支路相结合的并网逆变器，包括PWM逆变器、LCL-LC滤波器、用于监测并网电流的两个电流互感器和用于并网控制的含电流加权计算、电流误差计算以及比例积分调节的电流控制环和PWM驱动电路，PWM逆变器连接LCL-LC滤波器，LCL-LC滤波器连接电流控制环，电流控制环连接PWM驱动电路，PWM驱动电路连接PWM逆变器；两个电流互感器分别测量流经C支路与LC串联谐振支路的中间电流和网侧串联电感的电流，按照一定的权重系数相加所得作为逆变器输出电流的反馈控制信号，与电流指令信号比较，得到的误差值经过PI调节器后的输出信号作为逆变器PWM调制信号，控制LCL-LC并网逆变器的输出电流波形和幅值。
摘要（英）：

The invention discloses a grid-connected inverter of combination of LCL and multiple LC branches. The inverter comprises a PWM inverter, a LCL-LC filter, two current transformers used for monitoring a grid-connected current, a current control loop and a PWM driving circuit, wherein the current control loop is used for grid-connected control and contains current weight calculation, current error calculation and proportional-integral control. The PWM inverter is connected to the LCL-LC filter. The LCL-LC filter is connected to the current control loop. The current control loop is connected to the PWM driving circuit. The PWM driving circuit is connected to the PWM inverter. The two current transformers measure an intermediate current which flows through a C branch and a LC series resonance branch and a current flowing through network side series inductors respectively. The intermediate current is added to the current according to a certain weight coefficient and the sum is served as a feedback control signal of an inverter output current. The feedback control signal is compared to a current instruction signal so as to acquire an error value. An output signal after the obtained error value passes through a PI regulator is served as an inverter PWM modulating signal so as to control an output current waveform and an amplitude of a LCL-LC grid-connected inverter.

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