基于PSASP/UPI的VSC-HVDC系统潮流控制建模与仿真

Modeling and simulation of power flow control for VSC-HVDC based on PSASP/UPI

提出一种采用节点电流注入法含双端VSC-HVDC的交直流混合系统潮流控制交替求解新方法,交流系统与VSC-HVDC系统通过注入电流接口并交替求解,VSC-HVDC系统根据不同控制方式计算注入电流.对定交流母线电压控制通过无功注入电流反馈控制解决了交流母线电压参考值在交流系统潮流计算中不能直接给定的问题.本文所提新方法可借助电力系统分析综合程序(PSASP)的用户程序接口(UPI)功能实现含VSC-HVDC系统的潮流控制计算.通过新英格兰系统验证了本文所提方法的可行性及有效性.所提方法无需针对VSC-HVDC的各种控制方式改变VSC-HVDC两侧交流母线的节点类型,控制灵活;无需修改常规潮流计算的雅可比矩阵,程序编写量小,交直流接口清晰且通用性好;对利用商业软件进行含VSC-HVDC的实际电网潮流控制计算有参考价值.

Based on the nodal current-injection method,this paper proposes a novel alternate solution algorithm which is applied to power flow calculation of AC-DC hybrid power system with two-terminal VSCHVDC. AC system and VSC-HVDC system are interfaced through the injected currents and realize alternate solution. According to the different control modes,VSC-HVDC system calculates the corresponding injected currents. For constant AC bus voltage control mode,the problem that the reference value of AC bus voltage is not directly given in AC system power flow calculation is solved by using the reactive injected current feedback control method. Using the User Program Interface（ UPI） function of Power System Analysis Software Package（ PSASP）,the power flow control calculation of VSC-HVDC is achieved. The results of New England system verify the feasibility and validity of the proposed method. No change of the VSC-HVDC bus type of both sides is needed in the method,which makes the control flexible. No need to modify the Jacobian matrix during VSC-HVDC power flow calculation makes the program convenient with clear AC-DC interface and good versatility. This method is instructive for using commercial software to calculate the power flow control of real-world systems equipped with the VSC-HVDC.