Hybrid energy storage power distribution method with overcharge and overdischarge protection device

Abstract

The invention belongs to the field of power system energy storage optimization and new energy storage optimization, and relates to a variable time constant hybrid energy storage power distribution system and method with an overcharge and overdischarge protection device. The system includes a variable time constant controller. Hybrid energy storage power distribution module, hybrid energy storage overcharge and overdischarge protection device based on state of charge, battery energy storage module, super capacitor energy storage module, photovoltaic power generation module, and DC load. The invention can effectively reduce large fluctuations in battery power and increase the service life; at the same time, the overcharge and overdischarge protection strategy based on the power command and the state matching degree of the energy storage element can prevent the system from running in the direction of failure and reduce the risk of accidents.

Description

technical field [0001] The invention relates to a power distribution system and method of a hybrid energy storage system, in particular to a hybrid energy storage power distribution system and method with an overcharge and overdischarge protection device, and belongs to the fields of power system energy storage optimization and new energy storage optimization. Background technique [0002] Due to the increasing shortage of fossil fuels and the increasing environmental pollution caused by them, people pay more and more attention to the development and utilization of new energy. However, many renewable energy power generation technologies are limited by the environment, and the power they generate will show randomness and volatility to the outside world, which will affect the power balance, power supply reliability and power quality of the AC side when they are connected to the medium and low voltage distribution network. . For the shortcomings of renewable energy, energy sto...

AI Technical Summary

Problems solved by technology

[0003] Traditional hybrid energy storage system power allocation methods, such as the literature "Supercapacitor state adjustment method based on lithium battery charge and discharge state", this method considers the overall charge and discharge capacity of the hybrid energy storage system, when the charge and discharge state of the battery is determined, Adjust the size of the low-pass filter constant and redistribute power through the state of charge of the supercapacitor and its reference compensation power direction. At the same time, the overcharge and overdischarge and maximum power limitation between the battery and the supercapacitor are also detailed. According to the analysis, under various circumstances, by coordinating the power reference value of the battery and the supercapacitor, the overcharge and overdischarge of the battery and the supercapacitor are avoided, and the smoothing effect of the fluctuating power is also guaranteed, but its overcharge and overdischarge protection It does not consider the actual reference power of the battery and supercapacitor, which may still lead to overcharge and overdischarge of the battery and supercapacitor, which is difficult to apply to actual projects

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