Energy control method for independent photovoltaic hybrid energy storage system

Abstract

The invention discloses an energy control method for an independent photovoltaic hybrid energy storage system. The hybrid energy storage system comprises a storage battery, a super capacitor, a photovoltaic power generation unit, a DC bus and a DC load. The storage battery and the super capacitor are connected in parallel with the DC bus through respective bidirectional DC / DC converters. The photovoltaic power generation unit is connected to the DC bus through a BOOST converter. After data acquisition, an energy control processor calculates the power that should be borne by the hybrid energy storage system, and then the power passes through a first-order low-pass filter. According to limit control methods of different sections, the hybrid energy storage system, under different control conditions, achieves power distribution to the storage battery and the super capacitor, maintains the stability of the DC bus, stabilizes photovoltaic output power fluctuation, maintains in-system power balance, optimizes the work of energy storage equipment to a certain extent, and prolongs the service life of the energy storage equipment.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic power generation microgrid energy storage systems, in particular to an independent photovoltaic hybrid energy storage system energy control method, which is suitable for photovoltaic power generation microgrids and stabilizes DC bus voltage. Background technique [0002] The output power of photovoltaic power generation is intermittent, random and volatile. In order to realize the grid-connected operation of the planned power, it is necessary to effectively control the power of photovoltaic output. For example, the adjustment of the photovoltaic power generation system itself will reduce its power utilization rate and limit the flexibility of energy utilization. In order to improve the operating capacity of the photovoltaic power generation system, it is necessary to use the energy storage system to smoothly control the photovoltaic output power to meet the grid-connected operation requirements. ...

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the photovoltaic power generation micro-grid lacks the energy control method of the hybrid energy storage system. On the basis of considering the state of charge of the energy storage equipment, it provides an energy control method of the hybrid energy storage system, which can smooth the photovoltaic output power. control

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