风力发电系统正弦波逆变器设计

　　为了提高小型风力发电系统输出电能质量，设计了高效、可靠、低成本的正弦波逆变器。主电路由推挽升压变换器和单相逆变桥组成，采用高频变压器实现电压比调整和电气隔离，降低了噪声，提高了效率、减小了输出电压纹波。逆变器功率开关管采用了RCVD缓冲电路，确保逆变桥安全工作。控制部分采用集成脉宽调制芯片SG3524和正弦函数发生芯片ICL8038实现正弦波脉宽调制(SPWM)，简单可靠、易于调试。实验样机体积减小到传统逆变器的1/4，效率达到86%。实验结果表明输出电压波形失真度小于5%，在复杂的工况下实现了220 V/50 Hz的市电输出。

　　Abstract:

　　To improve electric energy quality of small scale wind power generating system output a high efficiency， credible and low cost sine-wave inverter is presented in this paper， High frequency inverter technology is selected. It contains high frequency transformer， which can fulfill voltage ratio regulation and electricity isolation， push-pull converter and single-phase bridge circuit as the main circuit， degrade noise， raise efficiency， reduce voltage ripple. Power switching tube adopts a RCVD cushion circuit to ensure safety working. Sine pulse width modulation control form is selected by using integrated circuit SG3524 and ICL8038， and simple， credibility， easy debug. The experimental model machine reduces the volume to 1/4 of the traditional inverter， system efficiency reach 86%. The experimental result indicates the distortion factor of the output voltage waveform less than 5% and output is 220V/50Hz commercial power in complicated operating mode.