关于屏蔽小电流、高电阻和高阻电压电路的更多信息，可参考第5章。
Further information on shielding low current, high resistance, and high impedance voltage circuits can be found in Section 5.
本文第二章详细介绍、分析了电压型Z源逆变器的拓扑、工作原理、控制方法和应用等。
The second chapter of the thesis introduces and analyzes the topology, operating principle, control method and application of the voltage-fed Z-source inverter.
第一章简单介绍了目前电网存在的几种问题，包括谐波问题、无功问题、三相不平衡问题、用电峰谷差过大的问题以及电压异常、断电问题等；
Several issues of power quality are presented, including harmonics, reactive power, three phase unbalance, large difference between peak load and vale load, voltage disturbance and so on.
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