A design method of an energy storage device of a microgrid system and the microgrid system

Abstract

The invention discloses a design method of an energy storage device of a microgrid system and the microgrid system, The method comprises the following steps: based on the daily photovoltaic power generation output curve and the load demand power curve in the corresponding period of time in the microgrid system, utilizing a preset dual-battery energy storage device operation model to analyze the ratio of the energy storage energy of each battery group to the total energy used by the energy storage device; Based on this, the number of batteries required for each battery pack to satisfy the powerbalance condition in the first period and the second period is determined, and the optimal number of batteries in series for each battery pack is obtained. The microgrid system comprises a load, a photovoltaic power generation device, a dispatching device storing a preset operation model of a dual-battery energy storage device and an energy storage device obtained according to the design method.The invention improves the use efficiency of the energy storage device in the microgrid system, prolongs the use time of the battery and slows down the aging condition.

Description

technical field [0001] The invention relates to the technical field of micro-grid system control, in particular to a design method for an energy storage device of a micro-grid system and a micro-grid system. Background technique [0002] Photovoltaic island microgrid balances power generation and load power with electric energy storage equipment. Lead batteries will continue to dominate this segment due to economic factors and technological maturity. Battery energy storage systems typically take up more than 50% of the total system investment. In the solar island microgrid, the lead storage battery plays an important role in maintaining the instantaneous power balance between power generation and electricity consumption, but the intermittent nature of solar energy makes the battery energy storage system need to charge and discharge in a short time, so , In some cases, it will prevent the battery from being fully charged, resulting in the formation of lead sulfate, which wi...

AI Technical Summary

Problems solved by technology

In the solar island microgrid, the lead storage battery plays an important role in maintaining the instantaneous power balance between power generation and electricity consumption, but the intermittent nature of solar energy makes the battery energy storage system need to charge and discharge in a short time, so , In some cases, it will prevent the battery from being fully charged, resulting in the formation of lead sulfate, which will reduce the efficiency of the battery, shorten its life, and may cause battery failure, so that the service life of the lead-acid battery is generally not high, limiting the use of island microgrids. long run

[0003] In the existing technology, using a dispatchable power source (usually a diesel generator) to generate electricity can alleviate this problem, but it will increase the operating cost of the system

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