中国电机工程学报Issue(21)：9-17,9.
零序和负序电压注入的级联型并网逆变器直流侧电压平衡控制
DC Voltage Balancing Control for Cascaded Grid-connected Inverters by Injecting Zero-sequence and Negative-sequence Voltages
摘要
Abstract
Cascaded grid-connected inverters can be transformerlessly connected to the high voltage grid and have the advantages of large-capacity and high-efficiency. It is of great significance to provide grid connection for large-scale renewable energy and to enhance the stability of power systems. However, the output performance and reliability of cascaded grid-connected inverters are seriously influenced by the DC voltage balancing problem which exists in cascaded configuration. Aiming at DC voltage balancing among phases of three-phase wye configuration, active power models of three phases are analyzed and compared by injecting zero-sequence and negative-sequence voltages. Considering the output performance and the power adjustment ability of inverters, the paper presents an interphase DC voltage balancing method and its applicable condition, which is combined using zero-sequence and negative-sequence voltages. This method can balance the DC voltages among phases even under the unbalanced system. Simulation and experimental results verify the feasibility and validity of the interphase DC voltage balancing method.关键词
级联型并网逆变器/三相星形结构/相间直流侧平衡/零序电压/负序电压Key words
cascaded grid-connected inverter/three-phase wye configuration/interphase DC voltage balancing/zero- sequence voltage/negative-sequence voltage分类
信息技术与安全科学引用本文复制引用
季振东,赵剑锋,孙毅超,姚晓君,朱泽安..零序和负序电压注入的级联型并网逆变器直流侧电压平衡控制[J].中国电机工程学报,2013,(21):9-17,9.基金项目
江苏省产学研前瞻性联合研究项目(BY2011156)。The Research Institutes Association Innovative Program of Jiangsu Province(BY2011156) （BY2011156）
