摘要
谐振对低压直流配电系统有负面影响,是导致电压崩溃的潜在原因。提出了分布式控制下低压直流配电系统的基于阻抗的单母线谐振分析方法和系统级谐振分析方法,并给出了一种有源阻尼补偿器。对各子系统建立了考虑控制器影响的阻抗模型,结合系统的阻抗模型和节点阻抗矩阵分别提出了分布式控制下系统的单母线和系统级谐振分析方法,并对单母线谐振机理进行分析,通过时域小信号模型分析该方法的正确性;系统级谐振分析方法适用于多并联、多级联和环型的低压直流配电系统。研究了部分影响因素对谐振的影响。根据谐振机理提出了有源阻尼补偿器,能够有效降低谐振频段输出阻抗的幅值,提高系统的稳定性。仿真结果证明所提分析方法和阻尼补偿器的有效性。
Resonance, imposing negative impact on LVDC distribution systems, is a potential factor of voltage collapse. A single-bus resonance analysis method and a system-level analysis method based on impedance for distributed controlled LVDC distribution system are proposed; and an active damping compensator is presented. Considering influence of the controllers, equivalent impedance of each subsystem is derived. Combined with system impedance model and node impedance matrix, with the proposed single-bus analysis method, the resonance mechanism under single-bus condition is analyzed. Correctness of the method is verified with a time-domain small signal model. The system-level analysis method is used to analyze stability of LVDC distribution system with multiparallel, multi-cascade and ring-type structures. Influence of some factors on the resonance is studied. According to the resonance mechanism, an active damping compensator is proposed to effectively suppress the amplitude of output impedance at resonance-frequency band and improve system stability. Simulation results prove effectiveness of the proposed analysis method and damping compensator.
出处
《电网技术》
EI
CSCD
北大核心
2017年第10期3358-3364,共7页
Power System Technology
基金
科技部国际合作项目(2015DFR70850)
湖南省科技重大专项(2015GK1002)
湖湘青年英才项目(2015RS4022)~~
关键词
低压直流配电系统
分布式控制
谐振稳定性
阻抗模型
有源抑制
LVDC distribution system
distributed control strategy
resonance stability
impedance model
active suppression
