面向风电并网运行稳定性的SMES-FCL控制策略研究  

Research on SMES-FCL Control Strategy for Operating Stability of Wind Farm Integrated System

作　　者：谭逸雪 苏小林[1] 米警伟 李丹丹[2] 曲彤[1] 

机构地区：[1]山西大学电力工程系,太原030013 [2]国网山西省电力公司临汾供电公司,山西临汾041000

出　　处：《南方电网技术》2017年第7期68-77,共10页Southern Power System Technology

摘　　要：针对双馈风电机组存在低电压穿越能力弱和功率输出不稳定的问题,构建和分析了适合于双馈风电机组并网的超导储能—限流系统(SMES-FCL),实现了储能和故障限流双重功能。针对含SMES-FCL的双馈风电机组并网系统的非线性特性,将模糊PI(Fuzzy-PI)控制策略引入SMES-FCL逆变器的电压电流双闭环控制系统,并实现与斩波器的协调控制,克服了传统PI控制参数整定困难且控制鲁棒性差的不足。在MATLAB/Simulink环境下建立了含SMES-FCL的双馈风电机组并网系统的仿真模型,分别对电网正常运行和外部短路故障多种场景进行了仿真分析。仿真结果表明本文所提方法不仅能改善双馈风电机组并网的输出功率平稳问题,而且还能改善其低电压穿越能力。Aiming at the problem of weak low voltage ride-through performance and unstable output power of doubly-fed induction generator （DFIG） , the superconducting magnetic energy storage-fault current limiter system（SMES-FCL） suitable for grid-connected DFIG is constructed and analyzed, which achieves dual functions of energy storage and fault current limiting. Considering the nonlin- ear characteristics of the grid-connected DFIG with SMES-FCL, fuzzy-PI control strategy is used to establish a voltage and current double closed-loop control system of the SMES-FCL inverter and realize coordinated control with chopper, which overcomes the short- comings of traditional PI control including difficult parameter tuning and poor robustness. Simulation model of DFIG with SMES-FCL is established by MATLAB/Simulink, simulation analysis and research are carried out under multi-conditions, such as normal opera- tion and short circuit fault. Results show that the proposed method can not only improve the output power stability of DFIG, but also enhance the low voltage ride-through capability.

关 键 词：双馈风电机组 低电压穿越 超导储能系统 超导限流器 模糊PI控制 

分 类 号：TM721.3[电气工程—电力系统及自动化]