The allocation of capacity of distributed photovoltaic energy storage System has always been an urgent problem to be solved, and reasonable capacity allocation plays an important role in stabilizing the power fluctuation of PCC node and smoothing the load output. In order to reasonably configure energy storage, this paper establishes an energy storage model based on the analysis of random error, which combines load prediction error and the randomness of photovoltaic output prediction error to meet the characteristics of normal distribution, and estimates the random error not considered by the original model, so that the results calculated by the model are more accurate. Combining with the example of the Liaoning branch of China Tower, and the capacity configuration of the photovoltaic energy storage system is verified by combining its load power and photovoltaic power curve.
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