摘要
为实现分布式光伏对配电网电压质量影响的精准评估,提出了一种基于半不变量的概率潮流计算方法。通过结合Gram-Charlier等级数展开理论,计算电压的概率密度函数以及相应节点的电压越限概率。最后,以IEEE 34节点辐射型配电系统为仿真算例,分析不同光伏渗透率下的电压质量水平,得出半不变量法在电压分布曲线拟合准确性与计算速度方面明显优于蒙特卡洛法,并精准量化电压越限风险水平,进而验证所提方法评估配电网电压质量的可行性与有效性。
In order to achieve an accurate assessment of the influence of distributed photovoltaics on the voltage quality of the distribution network,a semi-invariant probabilistic flow calculation method was proposed.By combining the Gram-Charlier rank number expansion theory,the probability density function of the voltage and the voltage over-limit probability of the corresponding node were calculated.Finally,taking the IEEE-34-node radial distribution system as a simulation example to analyze the voltage quality levels under different photovoltaic penetration rates,it is concluded that the semi-invariant method is significantly better than Monte-Carlo method in terms of voltage distribution curve fitting accuracy and calculation speed,and the risk level of voltage over-limit can be accurately quantified,and then the feasibility and effectiveness of the proposed method is verified for evaluation of the voltage quality of the distribution network.
作者
徐啸天
庞宇琦
刘勋宇
张新源
马刚
Xu Xiaotian;Pang Yuqi;Liu Xunyu;Zhang Xinyuan;Ma Gang(School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing Jiangsu 210046,China)
出处
《电气自动化》
2022年第2期11-14,共4页
Electrical Automation
关键词
分布式电源
半不变量
概率潮流
概率评估
电压质量
distributed power
semi-invariant
probabilistic flow
probability assessment
voltage quality
