| 引用本文: | 孙毅超,赵剑锋,季振东.并网型级联H桥变换器直流电压平衡和功率均衡控制策略[J].电力自动化设备,2014,34(1): |
| SUN Yichao,ZHAO Jianfeng,JI Zhendong.Control strategy of DC voltage balance and power equilibrium for grid-connected cascaded H-bridge converters[J].Electric Power Automation Equipment,2014,34(1): |
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| 摘要: |
| 通过建立级联型H桥变换器的数学模型，详细分析了各个H桥之间直流侧电压、传输功率产生不平衡的原因和机理，并提出了一种新的基于调制波矢量重构技术的电压平衡和功率均衡控制策略。该方法在传统级联型H桥变换器双闭环控制以及直流电压平衡控制的基础上，通过引入调制波矢量误差分量对初始调制波矢量进行重构，不仅保证了直流侧电压平衡，而且能够使得各个H桥之间有功功率按需分配、无功功率等量分配。同时，基于线性调制理论，所提方法与直接修改调制比的电压平衡方法相比具有更宽的约束范围，能适用于更大负载不平衡度工况；MATLAB／Simulink仿真验证了所提控制策略的正确性与有效性。 |
| 关键词: 多电平技术 级联H桥 变换器 直流电压平衡 功率均衡 调制波矢量重构 电压控制 |
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| 基金项目:江苏省产学研前瞻性联合研究项目（BY2011156）；江苏省普通高校研究生科研创新计划资助项目（CXZZ13_0094） |
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| Control strategy of DC voltage balance and power equilibrium for grid-connected cascaded H-bridge converters |
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SUN Yichao, ZHAO Jianfeng, JI Zhendong
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College of Electrical Engineering，Southeast University，Nanjing 210096，China
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| Abstract: |
| The mathematical model of cascaded H-bridge converters is established and the causes of unbalanced DC voltage between H-bridges and inequilibrium power transfer are discussed in detail. A control scheme is proposed based on the vector reconstruction of modulation wave，which，by introducing the modulation wave error component to traditional double closed loop control and DC voltage balance control，reconstructs the initial modulation wave to distribute the active power as required and the reactive power equally among H-bridges for ensuring the DC voltage balance. The restraint area of the proposed control scheme based on linear modulation theory is wider than that based on direct modulation ratio adjustment，suitable for larger load unbalance. Its correctness and effectiveness are tested and verified by simulation with MATLAB／Simulink. |
| Key words: multilevel technology cascaded H-bridge electric converters DC voltage balance power equilibrium modulation wave reconstruction voltage control |
