A Fuzzy Control Method Applied to Wind-solar Hybrid Energy Storage Microgrid System

Abstract

The invention discloses a fuzzy control method applied to a wind-solar hybrid energy storage microgrid system. This method first designs an independent microgrid structure based on wind power generation, solar energy, hybrid energy storage system, and AC and DC loads. Then, the low-frequency and high-frequency parts of the power fluctuations are obtained by using the mixed energy storage power through a low-pass filtering algorithm, and the power of low-frequency fluctuations is distributed to the storage battery, and the power of high-frequency fluctuations is distributed to supercapacitors. Then calculate the state of charge SOC of the supercapacitor sc , the state of charge of the supercapacitor and the hybrid energy storage power P hess Input the fuzzy controller, the output is the correction value of the filter time constant, dynamically adjust the filter time constant, so that the hybrid energy storage power can be allocated reasonably, so that the energy can flow efficiently in the energy storage device, reducing the number of charging and discharging of the battery, reducing the The charging and discharging depth of the battery increases the controllability of the energy storage system and further improves the economy of the microgrid.

Description

technical field [0001] The invention relates to a coordinated control method for a wind-solar-storage micro-grid system, in particular to a fuzzy control-based power coordinated distribution method. Background technique [0002] Affected by environmental and energy issues, the development and application of renewable energy has become an inevitable trend in the development of smart grids, and the efficient use of renewable energy has become a hot topic in energy research at home and abroad. Wind energy and solar energy are two commonly used green new energy sources, which have the advantages of wide distribution, environmental protection and cleanliness. The micro-grid system composed of wind and solar complementary distributed power generation units, energy storage systems, loads and control devices can maximize the use efficiency of wind and solar energy according to the characteristics of renewable energy. [0003] Due to the randomness and intermittency of the output po...

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Problems solved by technology

[0005] Aiming at the problem of maintaining the power balance of the independent wind-solar energy storage micro-grid system and keeping the DC bus voltage constant, the present invention proposes a fuzzy control method applied to the wind-solar hybrid energy storage micro-grid system, which is based on a variable filter time constant power Coordinate allocation strategy

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