| 引用本文: | 高志强,纪延超,王建赜,谭光慧.Z源光伏逆变器中感性负载的改进控制方法[J].电力自动化设备,2011,31(7): |
| GAO Zhiqiang,JI Yanchao,WANG Jianze,TAN Guanghui.Improved control of Z-source PV inverter with inductive load[J].Electric Power Automation Equipment,2011,31(7): |
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| 摘要: |
| 简单Z源逆变器的控制方法通过在普通SPWM零状态中插入固定直通占空比来获得。该方法虽然实现简单，但是在感性负载情况下，由于换向过程中无法提供续流通道，给输出电压和电流造成严重的畸变。基于产生畸变的机理，提出了一种改进的SPWM控制方法。该方法在换向时提供续流通道，不仅消除由于感性负载引起的输出交流波形的畸变，而且减少了周期内开关管动作个数和次数，有效降低了输出交流的THD和能量的损耗，提高了逆变的效率和质量。通过Matlab／Simulink 对改进控制方法进行了仿真，仿真结果证明该方法理论分析的正确性与可行性。 |
| 关键词: Z源 逆变器 光伏 脉冲宽度调制 感性负载 电压畸变 |
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| 基金项目:黑龙江省青年科学技术专项资金项目（G010303） |
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| Improved control of Z-source PV inverter with inductive load |
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GAO Zhiqiang, JI Yanchao, WANG Jianze, TAN Guanghui
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School of Electrical Engineering and Automation，Harbin Institute of Technology，Harbin 150001，China
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| Abstract: |
| Z-source inverter is normally controlled by simply inserting the fixed shoot-through state into the zero state of SPWM. Because there is no any free-wheel path，serious distortion of output voltage and current may be induced by inductive load. An improved SPWM control is proposed to support the free-wheel path， which not only eliminates the output voltage and current distortion of Z-source inverter with inductive load， but also lowers the switching frequency and decreases the operating switches in one cycle. Simulation with Matlab／Simulink verifies its effectiveness and feasibility. |
| Key words: Z-source electric inverters photovoltaic pulse width modulation inductive load voltage distortion |
