提高系统暂态稳定性的风电直流协调控制策略  

Coordinated Control Strategy for Wind Power and HVDC to Improve the Transient Stability of Power System

作　　者：姜惠兰[1] 肖瑞[1] 周照清 李政[1] JIANG Huilan;XIAO Rui;ZHOU Zhaoqing;LI Zheng(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统及其自动化学报》2021年第10期145-150,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51477115)。

摘　　要：风电规模的扩大和直流线路的增多,风火打捆交直流混联系统的暂态稳定性受到关注。本文从风火打捆交直流混联系统的实际网络拓扑结构出发,通过对节点导纳矩阵的收缩变换获取风电和直流输电功率外特性与系统等值机械功率间的关联关系,在此基础上基于扩展等面积定则,确定出DFIG和VSC-HVDC接入网络拓扑位置和输出特性对风火打捆交直流混联系统的暂态稳定的影响规律。进一步利用DFIG和VSC-HVDC对功率的可控性提出一种协调阻尼控制策略,利用风电和直流本身的灵活调节能力实时调节功率输出,促进系统快速恢复稳定。仿真结果表明,所提控制策略使得系统功角摆幅更小,恢复更快,在不添加额外硬件设备的情况下,有效提升了系统的暂态稳定性。With the scale expansion of wind power and the increase in DC lines,the transient stability of a wind-thermal bundled AC/DC system has attracted wide attention.From the actual network topology of this system,the correlation between the external characteristics of wind power and DC transmission power and the equivalent mechanical power of the system is obtained through the contraction transformation of the nodal admittance matrix.Afterwards,based on the extended equal area criterion,the influencing law of the access positions of doubly-fed induction generator(DFIG)and VSC-HVDC in the network topology and the output characteristics on the transient stability of the wind-thermal bundled AC/DC system is determined.Furthermore,the power controllability of DFIG and VSC-HVDC is utilized to propose a coordinated damping control strategy,i.e.,the flexible adjustment capabilities of wind power and DC are used to adjust the power output in real time,which is helpful for the system to quickly restore stability.Simulation results show that under the proposed control strategy,the system’s power angle swings less and recovers faster,thus effectively improving the transient stability of the system without adding additional hardware devices.

关 键 词：双馈风机 柔性直流输电 风火打捆 暂态稳定性 阻尼控制 

分 类 号：TM712[电气工程—电力系统及自动化]