摘要
基于电压源换流器的柔性直流输电(voltagesourceconverterHVDC,VSC-HVDC),其与弱交流电网构成的混联系统的稳定问题,是当前工程界关注的重点和学术界研究的热点。该文首先建立计及限幅环节、故障穿越策略,以及保护闭锁逻辑的VSC-HVDC机电暂态仿真模型;提出VSC换流器非线性功率特性的大扰动测辨方法,分析和识别影响VSC功率特性的关键因素。在此基础上,揭示大扰动冲击下混联系统存在的不同形式的失稳现象及其行为机理,并提出稳定控制策略。VSC-HVDC与弱交流电网混联系统的大扰动时域仿真结果验证了机理分析的正确性以及控制策略的有效性。
The stability problem of the voltage source converter based HVDC(VSC-HVDC) and weak AC network hybrid system is the focus of attention in the current engineering field and the hot spot of academic research. In this paper, the electromechanical transient simulation model of VSC-HVDC was established firstly with considering the limit amplitude link, fault ride through strategy and blocking logic. A large disturbance test method for the nonlinear power characteristics of VSC converter was proposed, and the power characteristics and key factors of the converter were analyzed. On this basis, the different forms of instability phenomenon and the behavior mechanism of the hybrid system under the large disturbance were revealed, and the countermeasures were put forward. The validity of the mechanism analysis and the effectiveness of the control measures were verified by the time domain simulation of the hybrid system with VSC-HVDC and weak AC network.
引文
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