考虑风电调度策略的电力系统随机潮流计算

针对风电并网系统，提出了一种考虑风电调度策略的多点线性化随机潮流计算方法。该方法以半不变量和Gram-charlier级数为基础，综合计及风电出力、传统发电和负荷的不确定性，借助多点线性技术保证计算结果的准确性；同时，借助安全约束经济调度方法，在随机潮流计算中嵌入了风电的调度策略。算例仿真表明，与模拟法相比，所提方法可有效改善基于半不变量和Gram-charlier级数的随机潮流计算方法应用于含风电电力系统时的计算精度；同时，克服了传统随机潮流计算中，风电大范围波动引起的不平衡功率完全由平衡机承担的缺陷，所得结果更为贴近实际。

Probabilistic Load Flow Calculation of Power Systems Considering Wind Power Dispatching Strategies

The paper proposes a method to calculate multi-point linearization probabilistic power flow of power systems considering the dispatching strategies of wind power. The proposed approach is based on the theory of Cumulant and Gram-charlier series, and takes into account the uncertainty of wind power, conventional power generation and load. To ensure accuracy, multi-point linearization technology is applied. In addition, the dispatching strategies of wind power are also considered in power flow calculation, as it did in power system economic power dispatching. Compared with simulation-based methods, the proposed approach can not only effectively improve the calculation accuracy compared with Cumulant and Gram-charlier series methods, but also can overcome the disadvantage of conventional probabilistic power flow calculation, i.e., the unbalanced power fluctuations are entirely absorbed by the slack bus. Therefore, the calculation results obtained through the proposed method is more consistent to reality.