In the case of distributed photovoltaic access to power grid,the large fluctuations in the amount of data and the existence of uncertainty in the net load of power grid may lead to a large relative error in the average of the voltage magnitude,phase angle,active and reactive current expectation and standard deviation in the trend calculation.For this reason,the net load uncertainty current calculation method for distributed photovoltaic access to power grid is proposed.After calculating the current parameters after distributed photovoltaic access to power grid,photovoltaic and net load uncertainty probability models are established.Beta distribution is introduced to approximate the description of light intensity variation.The median Latin hypercubic sampling method is used to collect samples,and serial computation is replaced with parallel computation.Through the improved Newton-Raphson method,multiple current calculations are executed,and the probability density curves of relevant indicators are plotted in order to realize the net load uncertainty current calculation for distributed photovoltaic access to power grid.The experimental results show that the proposed method has a small average relative error in voltage magnitude,phase angle,active and reactive current expectation and standard deviation,and the time used for calculation is short.The method can converge quickly and efficiently with strong robustness.
关键词
电网/分布式光伏/净负荷不确定性/潮流计算/牛顿-拉夫逊法/中值拉丁超立方采样法
Key words
Power grid/Distributed photovoltaic/Net load uncertainty/Current calculation/Newton-Raphson method/Median Latin hypercubic sampling method
维普
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