The structure of the sine wave inverter is given, the working principles of the control circuit and voltage feedforward are analyzed.

给出了正弦波逆变器的主电路结构，分析了控制电路及电压前馈的工作原理。

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The speed adjusting system with field weakening with voltage feedforward, current closed negative feedback and speed closed loop was designed by adopting digital signal processor (DSP).

采用数字信号处理器（DSP）控制器，设计了具有电压前馈和电流截止负反馈的转速闭环弱磁调速系统。

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Feedforward signal includes the information of both grid voltage and DC side load. Power balance between the input and output can be maintained by adjusting AC side currents.

前馈信号同时包含了电网电压和负载的信息，通过快速调节交流侧进线电流，使得系统功率平衡得以维持。

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