A smooth output method of wind-solar-storage combined power generation system

Abstract

The invention provides a smooth output method of a wind-power combined power generation system. The smooth output method comprises the following steps of separately acquiring a power forecast value of wind power generation and a power forecast value of photovoltaic power generation, adding the power forecast value of wind power generation into the power forecast value of photovoltaic power generation to obtain total power generation power forecast value so as to form a comprehensive data set; fitting the comprehensive data set by a polynomial fitting algorithm to obtain a smooth output formula; calculating a smooth output value according to the smooth output formula; and determining an output mode and a power output value of an energy storage system according to the size relation between the smooth output value and the total power forecast value of wind-power generation and the absolute value of a different value. According to the method, the smooth output formula is obtained by polynomial fitting on the power forecast value of wind-power generation, the whole planning output section can be considered, the smooth 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 invention relates to the field of electric power technology, in particular to a method for smoothing output of a wind-solar-storage combined power generation system. Background technique [0002] Wind energy and solar energy resources are 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 wind power and 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, a large-scale energy storage system can be configured for joint operation in the system of joint power generation of wind turbines and photovoltaic power plants. figure 1 It is a schematic diagram of a wind-solar-storage combined power generation system. ...

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Problems solved by technology

[0010] The main purpose of the embodiments of the present invention is to provide a smoothing output method of wind-solar-storage combined power generation system to solve the smooth output curve obtained by using the first-order low-pass filter algorithm to smooth the power fluctuation of wind power and photovoltaic combined power generation in the prior art There is a problem with delay

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