Control method and controller of hybrid energy storage

Abstract

The invention relates to a control method and controller of hybrid energy storage, belonging to the field of a wind and light supplementary power generation technology. The technical scheme is as follows: current and voltage signals of a super capacitor (4), a storage battery (9) and a load (7) are collected by a main controller (1) through a voltage and current sampling circuit (2) of the super capacitor, the voltage and current sampling circuit (3) of the storage battery and the voltage and current sampling circuit (6) of the load, respectively; after the current and voltage signals are processed by the main controller, a bidirectional DC/DC (Direct Current/Direct Current) converter (8) is controlled through a driving circuit (5), so that the power generation work and the energy storage work of the super capacitor, the storage battery and the load are at the maximum power point. The control method and the controller of the hybrid energy storage, provided by the invention, have the advantages that: the storage battery is at an optimized charging/discharging working state all the time and is hardly influenced by external factors, working conditions of the storage battery are improved, and the charging/discharging time of the storage battery is reduced, so that the service life of the storage battery is prolonged, and the stability and the whole conversion efficiency of a wind and light supplementary power generation and energy storage system are improved.

Description

technical field [0001] The invention relates to a hybrid energy storage control method and a controller, belonging to the technical field of wind-solar hybrid power generation. Background technique [0002] With the rapid development of wind-solar hybrid power generation and energy storage systems, lead-acid batteries have been rapidly developed as energy storage devices. However, energy storage devices in renewable energy systems not only face the problem of load power pulsation, but also often suffer from unstable power generation. Or pulsating state, the particularity of this load exposes the inherent shortcomings of the battery such as short cycle life, strict charge and discharge current limit, environmental problems, etc., leading to premature failure or capacity loss of the battery, shortening the cycle life , restricting the large-scale development of the system. In addition, the capacity configured to meet the peak power demand of the load has caused a large waste ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of wind-solar hybrid power generation and energy storage systems, lead-acid batteries have been rapidly developed as energy storage devices. However, energy storage devices in renewable energy systems not only face the problem of load power pulsation, but also often suffer from unstable power generation. Or pulsating state, the particularity of this load exposes the inherent shortcomings of the battery such as short cycle life, strict charge and discharge current limit, environmental problems, etc., leading to premature failure or capacity loss of the battery, shortening the cycle life , restricting the large-scale development of the system

In addition, the capacity configured to meet the peak power demand of the load causes a large waste and leads to the battery pack being too large and heavy

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