基于频率同步控制的VSC-HVDC在弱交流系统下的动态特性研究

发布时间：2018-01-14 13:24

本文关键词：基于频率同步控制的VSC-HVDC在弱交流系统下的动态特性研究　出处：《中国电机工程学报》2017年15期 　论文类型：期刊论文

【摘要】：该文研究适用于电压源型换流器高压直流输电(voltage source converter based HVDC,VSC-HVDC)连接弱交流系统的频率同步控制方法(frequency based synchronization control,FSC)对系统运行特性的影响。建立采用FSC控制的VSC-HVDC连接弱受端交流系统时的小信号模型,并将其与PSCAD/EMTDC中的电磁暂态仿真结果进行对比,验证了小信号模型的正确性。然后,基于小信号模型分析FSC控制中功率阻尼系数和功率同步系数对VSC系统小信号稳定性的影响。最后,针对交流系统频率变化、负荷阶跃和三相短路故障3种暂态运行工况,研究FSC控制下VSC系统的动态特性。结果表明,FSC控制不仅可提高VSC连接弱交流系统时的小信号稳定性,而且使系统具有良好的频率跟踪响应和过电流限制能力。
[Abstract]:This paper presents a study on voltage source converter for high voltage direct current transmission (HVDC) source converter based HVDC. Frequency based synchronization control (VSC-HVDC) frequency synchronization control method for weak AC system. The influence of FSC on the operating characteristics of the system. The small signal model of VSC-HVDC connected to the weak receiving AC system with FSC control is established. It is compared with the electromagnetic transient simulation results in PSCAD/EMTDC to verify the correctness of the small signal model. The influence of power damping coefficient and power synchronization coefficient on small signal stability of VSC system is analyzed based on small signal model. Finally, the frequency variation of AC system is analyzed. The dynamic characteristics of VSC system under FSC control are studied under three transient operating conditions of load step and three-phase short circuit fault. FSC control can not only improve the stability of small signal when VSC is connected to weak AC system, but also make the system have good frequency tracking response and over-current limiting capability.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);先进输电技术国家重点实验室(全球能源互联网研究院);
【基金】：国家自然科学基金项目(51507060) 先进输电技术国家重点实验室开放课题资助中央高校基本科研业务费专项资金资助(2016MS07)~~
【分类号】：TM721.1
【正文快照】： 0引言电压源型换流器高压直流输电(voltage sourceconverter based HVDC,VSC-HVDC)凭借其控制方法灵活方便、潮流反转易实现、能工作在无源逆变方式及可动态补偿无功功率等技术特点得以快速发展,其中供电弱受端系统是其应用场合之一[1-2]。目前,VSC-HVDC广泛采用电流矢量控制(

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