首页|Simplified Cluster Voltage Balancing Control Based on Zero-sequence Voltage Injection for Star-connected Cascaded H-bridge STATCOM
Simplified Cluster Voltage Balancing Control Based on Zero-sequence Voltage Injection for Star-connected Cascaded H-bridge STATCOM
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The cluster DC voltage balancing control adopting zero-sequence voltage injection is appropriate for the star-connected cascaded H-bridge STATCOM because no zero-sequence currents are generated in the three-phase three-wire system.However,as the zero-sequence voltage is expressed in trigonometric form,traditional control methods involve many complicated operations,such as the square-root,trigonometric operations,and inverse tangent operations.To simplify cluster voltage balancing control,this paper converts the zero-sequence voltage to the dq frame in a DC representation by introducing a virtually orthogonal variable,and the DC components of the zero-sequence voltage in the dq frame are regulated linearly by proportional integral regulators,rather than being calculated from uneven active powers in traditional controls.This removes all complicated operations.Finally,this paper presents simulation and experimental results for a 400 V/±7.5 kvar star-connected STATCOM,in balanced and unbalanced scenarios,thereby verifying the effectiveness of the proposed control.
Cluster DC voltage balancing controlDC representation of zero-sequence voltagestar-connected cascaded H-bridge STATCOMzero-sequence voltage injection
Kai Hu、Guoliang Zhao、Daorong Lu、Zhengang Lu、Nianwen Xiang、Shulai Wang、Jintian Lin
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School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China
State Grid Smart Grid Research Institute(SGRI),Beijing 102209,China
School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210023,China
Power grid Technology Center of State Grid Zhejiang Electric Power Research Institute,Hangzhou 310004,China
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National Key R&D Program of ChinaScience and Technology Project of State Grid Corporation of China
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