The switch frequency is increased and the output harmonic is decreased while the overcurrent protection is ensured.

保证过电流保护的同时，还提高了开关频率，减小了输出谐波。

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Because of the ripple of the DC power supply, the output harmonic amplitude of the voltage controlled SPWM inverter is higher.

由于直流供电电源纹波的影响，电压控制SPWM逆变电路的输出谐波分量幅值较大。

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Also, optimized SAPWM modulation wave has been utilized, improving the utility ratio of DC voltage and restraining effectively the output harmonic current of inverter.

并采用优化的SAPWM调制信号，提高了直流电压的利用率，并能有效地抑制逆变器输出的谐波电流。

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