A method for smoothing joint power generation of photovoltaic power plants and energy storage systems

Abstract

The invention provides a combined power generation smooth output method of a photovoltaic power station and an energy storage system. The method comprises the following steps of acquiring a data set comprising power forecast values of the photovoltaic power station; fitting the data set by using a polynomial fitting algorithm to obtain a combined power generation smooth output formula; calculating a combined power generation smooth output value according to the combined power generation smooth output formula; and determining an output mode and a power output value of the energy storage system according to the size relation between the combined power generation smooth output value and the power forecast values of the photovoltaic power station and the absolute value of a different value. According to the method, the output value of smooth power fluctuation of the photovoltaic power station is determined by a polynomial fitting method, the whole planning output section can be considered, the output value after optimization is more moderate, and the inertia time of a first-order lowpass filtering method is reduced. Compared with the prior art, the method provided by the embodiment of the invention has the advantages of more optimal smooth output effect.

Description

technical field [0001] The present invention relates to the field of electric power technology, in particular to a method for smoothing output of combined power generation of a photovoltaic power station and an energy storage system. Background technique [0002] Solar energy is a clean and renewable energy, but there are problems of randomness and volatility, which bring a series of impacts to the power grid. The degree of power fluctuation directly affects the original power flow distribution of the power grid. When the penetration rate of photovoltaic power generation is at a high level, the volatility and randomness will have a huge impact on the original operation mode of the power grid. In order to reduce this impact, large-scale energy storage systems can be configured in photovoltaic power plants for joint operation. figure 1 It is a schematic diagram of a photovoltaic power station and large-scale energy storage combined power generation system. Multiple photovolta...

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Problems solved by technology

[0010] The main purpose of the embodiments of the present invention is to provide a method for smoothing the joint power generation of photovoltaic power plants and energy storage systems, so as to solve the delay phenomenon in the smooth output curve obtained by using the first-order low-pass filter algorithm to stabilize the power fluctuations of photovoltaic power plants in the prior art The problem

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