第一部分讨论各种谐波问题，如使供电电压畸变，降低功率因数，增加能量损耗，干扰通讯系统等。
The harmonic problems, such as distorting supply voltage, decreasing power factor, increasing energy loss, interfering with communication systems etc. are discussed in the part one.
软开关技术能够有效改善功率开关管的工作环境，降低开关损耗，提高变换器的效率。
Soft switching technique could improve the circumstance of the power switch, reduce the losses and increase the efficiency of the converter.
无功补偿是保持电力系统无功功率平衡、降低损耗、提高供电质量的一种重要手段。
Reactive compensation is an important way which maintains the reactive power balance of the electric power system, reduces the loss and increases supply quality.
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