交直流电力系统概率潮流计算

基于概率理论的解析法，提出了包含直流系统的概率潮流模型。以节点注入功率和PV节点电压运行曲线构成系统的多运行方式，并计及节点注入之间的相关性，对交直流电力系统进行概率潮流计算，获得了节点电压及直流系统变量的均值和协方差。由随机变量数字特征的基本性质和交流系统概率潮流计算的原理，在直角坐标系下推导了不同直流控制方式的交直流概率潮流算式。以整流器定电流控制、逆变器定电压控制为例，在改造后的新英格兰39节点系统上计算了节点电压及换流器各角度的均值和标准差，分析结果表明了所提算法的有效性。

Probabilistic Load Flow Calculation for AC/DC Power Grid

Based on the analytical method of probabilistic theory, a probabilistic load flow model considering DC systems is proposed. In the proposed model, multi-operating modes are constituted by nodal injected power and the operation curves of PV nodes and the correlativity among injected nodes is taken into account. Through probabilistic load flow calculation for AC/DC power grid the expectations and covariances of nodal voltages and DC system variables are obtained. According to the basic property of digital characteristics of probabilistic variables and the principle of probabilistic power flow calculation of AC power system, the AC and DC probabilistic power flow calculation equations in rectangular coordinates under different DC control modes are derived. Taking constant current control of rectifiers and constant voltage control of inverters for example, the expectations and standard deviation of nodal voltage and that of converter under different controlling angles are calculated, analysis results show that the proposed algorithm is effective.