考虑VSC控制策略的交直流混合电网潮流计算  

Power Flow Calculation of AC/DC Hybrid Power Grid Considering VSC Control Strategy

作　　者：王学奎 彭春华 孙惠娟 WANG Xuekui;PENG Chunhua;SUN Huijuan(School of Electric and Automation Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi Province,China)

机构地区：[1]华东交通大学电气与自动化工程学院,江西省南昌市330013

出　　处：《中国电机工程学报》2023年第10期3731-3741,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52167009,52267007);江西省主要学科学术和技术带头人项目(20204BCJL22038);江西省教育厅科技项目(GJJ210646)。

摘　　要：鉴于电压源换流器(voltage source converter,VSC)的控制策略会对含VSC交直流混合电网潮流产生直接影响,该文构建考虑多种VSC控制策略的交直流混合电网潮流计算模型。该模型通过构造等效电路建立换流站内VSC控制参数与交流电网输出功率的直接联系,以实现完整VSC电路模型下潮流方程的统一;并通过引入VSC自适应下垂控制系数作为潮流计算变量,以弥补现有方法无法适用于VSC自适应下垂控制策略电网的不足;此外,该模型将VSC调制度作为求解变量,并考虑调制度的约束问题,有效限制了调制度越限情形,还可实现调制度不同设定值下的潮流计算。基于上述模型,采用统一迭代法最终实现考虑各种VSC控制策略的交直流混合电网潮流计算,并通过算例验证模型的有效性与计算方法的快速收敛性。In view of the voltage source converter(VSC)control strategy will have a direct impact on the power flow of the AC/DC hybrid power grid containing VSC,this paper constructs a power flow calculation model for the AC/DC hybrid power grid that considers multiple VSC control strategies.This model establishes a direct connection between the VSC control parameters in the converter station and the output power of the AC grid by constructing an equivalent circuit to realize the unification of the power flow equations under the complete VSC circuit model;and by introducing the VSC adaptive droop control coefficient as a power flow calculation variable,to make up the shortcomings of the existing methods that cannot be applied to the VSC adaptive droop control strategy power grid;in addition,this model takes the VSC modulation index as the solution variable,and considers the constraint of modulation index,which effectively limits the over-limit situation of the modulation index,and can also realize power flow calculation under different set values of the modulation index.Based on the above model,the unified iterative method is used to finally realize the power flow calculation of the AC/DC hybrid power grid considering various VSC control strategies,and the validity of the model and the rapid convergence of the calculation method are verified through calculation examples.

关 键 词：电压源换流器控制策略 交直流混合电网 潮流计算 自适应下垂控制 调制度 

分 类 号：TM744[电气工程—电力系统及自动化]