Energy storage subsystem used for batch-type renewable energy source power generation system and control method of energy storage subsystem

Abstract

The invention belongs to the field of energy storage of electric system micro-grids, and particularly relates to an energy storage subsystem used for a batch-type renewable energy source power generation system and a control method of the energy storage subsystem. The energy storage subsystem used for the batch-type renewable energy source power generation system comprises independent storage batteries, bidirectional DC power conversion devices, a storage battery charging and discharging controller, a storage battery state monitor device, an energy storage system concentrated control device and a connection line. By the utilization of all the storage batteries, instantaneous power balance between the batch-type new energy resource power generation and electric loads is finished, the utilization rate of resources is improved to the maximum extent, the idle waste of the storage batteries is avoided, the performance of the storage batteries is effectively protected, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of energy storage of a power system micro-grid, and in particular relates to an energy storage subsystem of an energy storage system in a micro-grid for an intermittent renewable energy power generation system and a control method thereof. Background technique [0002] New energy power generation equipment such as wind and light has the characteristics of intermittent and random power generation. In order to meet the continuous and stable power supply needs of such high-permeability systems, energy storage equipment must be equipped. Under the current technical conditions, large-capacity energy storage is still dominated by lead-acid batteries. However, during the use of lead-acid batteries, if the control strategy is not appropriate, the service life of the battery will be significantly shortened, and the energy storage capacity should be greatly reduced. However, the intermittent, distributed and random power gener...

AI Technical Summary

Problems solved by technology

However, in order to meet the purpose of protecting the battery, this patent largely sacrifices the overall performance of the energy storage system

Its control strategy can only realize charging and discharging of a single set of batteries at a certain moment, and the remaining battery sets will be in an idle state. Therefore, in order to meet the large power demand, it is necessary to increase the overall capacity of the energy storage system, which increases the construction cost. cause unnecessary waste

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