应对并补电网下DFIG系统高频谐振的宽频阻抗重塑策略  

Reshaping Strategy of Wide Frequency Impedance for DFIG System to Suppress High Frequency Resonance Under Parallel Compensation Grid

作　　者：年珩[1] 庞博[1] 许国东 邱纪星 NIAN Heng;PANG Bo;XU Guodong;QIU Jiixing(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang Windey Co.Ltd.,Hangzhou 310012,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]浙江运达风电股份有限公司,浙江省杭州市310012

出　　处：《电力系统自动化》2018年第18期48-56,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51622706)~~

摘　　要：并联补偿在电力系统中广泛用于无功补偿及提高电网电压供电质量,当基于双馈式感应发电机(DFIG)的风电机组接入并补电网时,若其阻抗与并补电网阻抗不匹配,则风电机组与电网的互联系统会引发高频谐振,恶化系统运行性能。提出一种基于阻抗重塑技术的DFIG系统高频谐振抑制策略,在分析DFIG机侧和网侧阻抗的基础上,在网侧变流器中引入了基于切比雪夫滤波器的阻抗重塑控制器,对DFIG系统高频段阻抗特性进行宽频域范围重塑,从而避免了已有高频谐振控制策略中的谐振检测环节,改善了目前基于谐振频率检测的谐振抑制策略中存在的在并补度改变时谐振抑制性能下降的问题,提高了DFIG系统对并补电网的适应能力。进而,分析了所提出的谐振抑制策略对基频控制的影响,并对所提DFIG系统高频谐振抑制策略进行了仿真验证。Parallel compensation has been widely used to compensate reactive power and improve power quality of grid voltage.When doubly fed induction generator（DFIG）based wind turbine is connected to parallel compensation grid,due to the unmatched impedance of DFIG system with parallel compensation grid,the interconnected system suffers high frequency resonance,which will further degrade the operation performance of DFIG system.An impedance reshaping strategy for DFIG system to mitigate high frequency resonance is proposed,which introduces a controller based on Chybeshev filter at grid-side converter to reshape high frequency impedance of DFIG system and can avoid the resonance frequency detection in existing methods.The proposed control strategy can solve the problem of control performance degradation that happens when compensation degree changes,thus the adaptability of DFIG system to compensation grid can be improved.In addition,the influences on fundamental frequency control caused by the proposed resonance damping strategy are analyzed.And the simulation of the high frequency harmonic suppression strategy for DFIG system is validated.

关 键 词：并联补偿 双馈感应发电机 高频谐振 阻抗重塑 

分 类 号：TM614[电气工程—电力系统及自动化]