计及DG出力相关性的孤岛微电网蒙特卡洛法概率潮流

Islanded Microgrids Probabilistic Load Flow Considering Correlated DG Output Based on Monte-carlo Method

孤岛微电网缺乏主网的支撑,分布式电源(distributed generator,DG)出力的随机性以及负荷的波动性都将对系统频率及电压造成影响。为准确分析孤岛模式下微电网的运行状态,提出一种计及DG出力相关性的孤岛微电网概率潮流计算方法。首先简化孤岛微电网节点分类,将潮流方程表达成统一形式;其次,在考虑DG出力的相关性下运用蒙特卡洛法进行抽样计算,从而获得概率潮流结果;最终以Benchmark 0.4 kV低压微电网系统作为算例,验证了文中方法的有效性。

Islanded microgrids lack of the support from upper power grid,so the frequency and voltage of microgrid will be influenced by the randomness of DG and the volatility of the load.Islanded microgrids probabilistic load flow calculation method considering correlated DG output based on monte-carlo method is presented,which can accurately analyze the operating state of microgrids in the islanded mode.First of all,the classification of gisle microgrid nodes is simplified,and the uniform expressions of island microgrid power flow are worked out;then the Monte Carlo method is used to calculate the result of probability flow considering correlated DG output.Finally,the Benchmark 0.4 kV low voltage microgrid system is taken as an example to verify the validity of the calculation method.