一种适用于混合多馈入直流输电系统的附加虚拟电阻阻尼控制方法  

A Supplementary Virtual-resistor Damping Control for Hybrid Multi-infeed HVDC System

作　　者：郭春义[1] 赵剑[1] 刘炜[1] 赵成勇[1] GUO Chunyi;ZHAO Jian;LIU Wei;ZHAO Chengyong(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Changping District, Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学)

出　　处：《中国电机工程学报》2019年第12期3400-3408,共9页Proceedings of the CSEE

摘　　要：针对混合双馈入直流输电系统由于交流系统强度下降而造成的系统小干扰失稳现象,提出一种附加虚拟电阻阻尼控制(supplementary virtual-resistor damping control,SVRDC)。该控制基于联络线上流过的电流和引入的虚拟电阻,将产生的附加分量反馈到电压源换流器子系统定交流母线电压外环控制器上,通过增加虚拟阻尼电阻和增强电气联系紧密度,来提高系统阻尼特性。采用特征根分析法研究交流系统强度对混合双馈入直流输电系统小干扰稳定性的影响;建立包含SVRDC控制的混合双馈入直流输电系统的小干扰动态模型,并通过与PSCAD详细电磁暂态模型仿真结果的对比,验证了小干扰动态模型的正确性。对比研究了有无SVRDC控制时对系统小干扰稳定性的影响。结果表明,SVRDC控制可以有效抑制由于交流系统强度下降而造成的系统小干扰失稳现象,在不增加系统实际损耗的前提下增强了系统的小干扰稳定运行能力。As for the instability issue of hybrid dual-infeed HVDC system caused by the decreased strength of AC system,this paper proposed a supplementary virtual-resistor damping control(SVRDC). Based on the current flowing through the tie-line and introduced virtual resistor, the SVRDC approach introduced an additional component to the input of AC voltage controller of voltage source converter(VSC) subsystem,improved the system damping characteristics by enhancing the virtual damping and electrical coupling. Firstly, the impact of the strength of AC system on the small signal stability of hybrid dual-infeed HVDC system was investigated by eigenvalue analysis. Then, a small-signal model of hybrid dualinfeed HVDC system with the proposed SVRDC approach was developed, and validated by the detailed electromagnetic transient(EMT) simulation. Finally, this paper investigated the impact of the SVRDC approach on the small signal stability of hybrid dual-infeed HVDC system. The results show that the proposed SVRDC approach can effectively mitigate the instability issue caused by the decreased strength of AC system, and thus enhance the stability of the system without increasing the power loss of the overall system.

关 键 词：混合双馈入直流输电系统 附加虚拟电阻阻尼控制 小干扰稳定性 

分 类 号：TM731[电气工程—电力系统及自动化]