Control voltage of DC energy storage unit in universal power quality compensator based on ZVT-PWM

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies Pub Date : 2008-04-06 DOI:10.1109/DRPT.2008.4523739

Zhu En-guo, Wu Guo-liang, Yang Gong-xun

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Abstract

Supply power for DC energy storage unit by rectifier circuit produced harmonic and decreased power factor. Active power factor correction (APFC) resolved these problems, but this kind of hard switching circuit produced much consumption. It proposed a strategy that using soft switching power transformation technology to control switching devices. An improved scheme based on zero voltage transition (ZVT) PWM converter was presented and corresponding circuit was designed. The dynamic operation courses of circuit and switching states of power devices were researched. The strategy realized zero voltage transition by controlling power devices. Main switching device was conducted and turned off when voltage of resonance network was zero. The results have verified validity and feasibility of the strategy. It can decrease power consumption of switching devices, reduce harmonic, improve power factor and further perfect operation performance of universal power quality compensator.

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基于ZVT-PWM的通用电能质量补偿器直流储能单元电压控制

整流电路为直流储能装置供电产生谐波，降低了功率因数。有源功率因数校正(APFC)解决了这些问题，但这种硬开关电路的功耗很大。提出了一种利用软开关功率变换技术控制开关器件的策略。提出了一种基于零电压转换(ZVT) PWM变换器的改进方案，并设计了相应的电路。研究了电路的动态运行过程和功率器件的开关状态。该策略通过控制电源器件实现零电压转换。当谐振网络电压为零时，主开关装置导通并关断。结果验证了该策略的有效性和可行性。它可以降低开关器件的功耗，减少谐波，提高功率因数，进一步完善通用电能质量补偿器的工作性能。

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2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

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