Photovoltaic power supply hybrid energy storage system

Abstract

The invention relates to a photovoltaic power supply hybrid energy storage system which comprises a super capacitor, a storage battery pack, a backup energy storage system, three energy storage inductances, six IGBTs (Insulated Gate Bipolar Transistors) with antiparallel diodes and a state monitor. After the super capacitor is connected in series with a first energy storage inductance, one end of the super capacitor is connected with a cathode of a photovoltaic power supply DC (Direct Current) bus and the other end of the super capacitor is respectively connected with the cathode and an anode of the DC bus by a first IGBT and a second IGBT; after the storage battery pack is connected in series with a second energy storage inductance, one end of the storage battery pack is connected with the cathode of the DC bus and the other end of the storage battery pack is respectively connected with the cathode and the anode of the DC bus by a third IGBT and a fourth IGBT; and after the backup energy storage system is connected in series with a third energy storage inductance, one end of the backup energy storage system is connected with the cathode of the DC bus and the other end of the backup energy storage system is respectively connected with the cathode and the anode of the DC bus by a fifth IGBT and a sixth IGBT. According to the invention, the advantages of three types of energy storage units are complemented; power supply quality and utilization rate of light energy are improved; operating life of the system is effectively prolonged; and operating cost is reduced.

Description

technical field [0001] The invention relates to a hybrid energy storage system for adjusting the operating state of a photovoltaic power generation system, which belongs to the technical field of power generation. Background technique [0002] Solar photovoltaic power generation is a way to effectively use solar energy. It has the advantages of no consumption of primary energy during operation, no pollution, no noise, and the construction scale can be large or small. However, the photovoltaic power generation system also has the disadvantages of poor power quality and low utilization rate of light energy during operation, which affects the practical application of photovoltaic power generation technology. The main reason for these problems is that the power generation capacity of photovoltaic cells will change non-linearly in the same direction as the sunlight illuminance changes, and change in the opposite direction as the temperature changes, and the maximum output can onl...

AI Technical Summary

Problems solved by technology

In fact, the sunny or rainy days in the area where the photovoltaic power generation system is installed occasionally happen. Simply relying on supercapacitors and battery packs to meet the long-term continuous charging or discharging needs is very difficult in terms of the investment utilization rate of the energy storage system. uneconomical

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