含VSC-HVDC交直流混合系统机电暂态仿真研究  

Electromechanical transient simulation of AC-DC hybrid systems containing VSC-HVDC

作　　者：张芳[1] 李静远[1] 李传栋[2] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]福建省电力有限公司电力科学研究院,福建福州350007

出　　处：《电力自动化设备》2016年第2期17-24,共8页Electric Power Automation Equipment

摘　　要：对含基于电压源型变流器的高压直流输电(VSC-HVDC)交直流混合系统进行机电暂态仿真研究。VSC-HVDC系统的外环功率、电压控制器采用PI控制,以产生内环电流参考值。针对dq同步旋转坐标系下VSC-HVDC交流侧数学模型不能精确解耦的问题,建立基于αβ静止坐标系的VSC-HVDC数学模型,引入比例谐振(PR)控制改进了内环电流控制器,可以无静差跟踪内环电流信号。采用以上控制策略实现VSCHVDC系统的精确解耦控制,并采用双时步仿真方法对VSC-HVDC系统的动态响应进行准确模拟。通过在新英格兰系统上进行仿真实验,验证了所提VSC-HVDC机电暂态控制模型的正确性和双时步混合仿真方法的有效性。The electromechanical transient simulation is studied for the AC-DC hybrid system containing VSC-HVDC（Voltage Source Converter based High Voltage Direct Current）. The outer-loop power / voltage controller of VSC-HVDC applies the PI（Proportional Integral） control to generate the inner-loop current reference. Since the AC-side mathematical model of VSC-HVDC on the dq synchronous rotating coordinates cannot be accurately decoupled,its mathematical model on the αβ stationary coordinates is established and the PR（Proportional Resonant） control is introduced to the inner-loop current controller to track the innerloop current signal with zero steady-error,which realizes the decoupled precise control of VSC-HVDC. The dual time-step method is used to accurately simulate the dynamic response of VSC-HVDC. The correctness of the VSC-HVDC electromechanical transient model and the validity of the proposed dual time-step hybrid simulation method are verified by the simulative results of New England system.

关 键 词：VSC-HVDC 高压直流输电 机电暂态 比例谐振控制 双时步混合仿真 交直流混合系统 

分 类 号：TM721[电气工程—电力系统及自动化]