共直流母线并联型风电变流器环流分析  

MODELING OF CIRCULATING CURRENT IN PARALLEL WIND POWER GENERATION SYSTEMS

作　　者：李泉峰[1] 陈明亮[2] 肖飞[2] 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《太阳能学报》2017年第5期1333-1338,共6页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2012CB215103;2013CB035601);国家高技术研究发展(863)计划(2013AA050404)

摘　　要：该文研究共直流母线并联型风电变流器的环流问题。对于共直流母线并联变流器,采用载波移相技术后,由于变流器输出瞬时电压的差异,此时会产生不流经电机和电网,只在变流器之间流动的环流,因此,针对该情况,首先分析环流的特性,并根据分析结果设计基于PR控制的环流抑制策略,仿真与实验都验证了该策略的有效性。This paper presents circulating current control strategies wind power generator with parallel-operating converters linked by with a common dc bus, when carrier phase shifting parallel is used, for a muhi-megawatt direct-drive permanent-magnet common dc bus. For multiple converters in parallel the switching status of the converters in parallel will differ from each other. This creates currents that flow among power switching devices and will flows in a circular loop between the power converters and not affect the net current in either the generator or the power grid. In the paper, A circulating current model is derived and analyzed. The PR controllers are designed to suppress the circulating current. The simulation and experiment results of parallel full power converters show the feasibility of the proposed theory and control scheme.

关 键 词：载波移相 环流 PR控制 风电变流器 设备并联 

分 类 号：TM711[电气工程—电力系统及自动化] TM76