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一种三角形联结串联H桥SVG直流侧电压控制方法研究

, PP. 70-78

Keywords: 三角形联结,级联H桥SVG,直流侧电压控制

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Abstract:

通过对三角形联结串联H桥SVG直流侧电压均衡控制进行深入研究,建立三层直流侧电压均衡控制系统。第一层为总直流侧电压,通过产生基波正序有功电流维持三相所有H桥模块直流侧电压之和恒定;第二层为三相之间均衡控制,通过在变流器指令电压中注入零序电压产生零序电流实现三相功率的再分配,实现三相均衡;第三层为每相内部各H桥模块均衡控制,通过沿电流方向微调每相各模块指令电压实现各模块吸收的功率重新分配,进而保证模块直流侧电压等于给定值。最后通过实验验证了该控制方法的可靠性和有效性。

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