In accordance with the current status on urban fuel gas supply in our country the reason of losses in fuel gas business is analyzed and the major loss coming from metering is stated.
针对国内城市燃气供应的现状，分析了燃气经营的亏损原因，指出计量亏损乃是主导方面。
Test results proved that the motor had lower current harmonic, more efficient use of DC supply voltage than SPWM, less switch loss of power switch.
实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。
Test results proved that the motor had lower current harmonic, more efficient use of DC supply voltage than SPWM, less switch loss of power switch.
实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。
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