对空间电压矢量方法进行了改进，在不改变系统输出特性的前提下，使开关频率降低了50%。
Maintaining the output character of the system, the voltage space vector control was improved which made the switching frequency decrease 50%.
作出对应的状态轨迹图，通过仿真和实测，求出相应的电压、电流波形及输出特性，从中得出有益的结论。
Through simulation and measuring, a corresponding state locus diagram and a voltage and current waveform and output characteristics are thus made, from which a useful conclusion is reached.
恒功率输出特性避免高压钠灯在高于220v标准电压时会产生超亮度浪费。
Constant power output characteristics can avoid prodigality caused by super-brightness when voltage of high-voltage sodium lamp exceeds 220v.
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