Supercapacitor and storage battery mixed energy-storing energy management circuit in photovoltaic grid-connected power generation

Abstract

The invention discloses a supercapacitor and storage battery mixed energy-storing energy management circuit in photovoltaic grid-connected power generation and relates to the technical field of control and application of new energy. The supercapacitor and storage battery mixed energy-storing energy management circuit is characterized in that a first detection and control circuit is connected between a storage battery and a direct-current bus, and a supercapacitor is connected between an anode and a cathode of the direct-current bus through a second detection and control circuit. Effective energy management for the storage battery and the supercapacitor is achieved by simultaneously using the storage battery and the supercapacitor as energy storing devices of a photovoltaic grid-connected power generation system and taking advantages of high storing capacity and low cost of the storage battery and high power density and long service life of the supercapacitor, and accordingly charge-discharge times of the storage battery are greatly decreased, and the service life of the storage battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of new energy control and application, in particular to a supercapacitor and battery hybrid energy storage energy management circuit for photovoltaic grid-connected power generation. Background technique [0002] In the photovoltaic grid-connected power generation system, the photovoltaic array cannot continuously and stably output electric energy due to changes in natural conditions such as sunlight intensity and ambient temperature, resulting in stability problems in the photovoltaic power generation system, making it difficult to track load changes well. Therefore, it is of great significance to configure an energy storage device with a certain capacity in the system for photovoltaic grid-connected power generation systems. The energy storage device can stabilize the output power of the photovoltaic power generation system, so that when the power generation or load power fluctuates greatly It can still ma...

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Problems solved by technology

[0004] However, because battery energy storage is achieved through chemical reactions, its aging speed is directly related to charge and discharge sensitivity, and its service life is directly related to the number of charge and discharge times. In photovoltaic grid-connected power generation systems, the output power of photovoltaic arrays will vary with the intensity of Due to frequent changes in natural conditions such as ambient temperature, the battery will be charged and discharged frequently, resulting in the disadvantages of fast aging, short life and high system maintenance costs in the battery in the photovoltaic grid-connected power generation system.

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