Over-charging and over-discharging protection apparatus-equipped mixed energy storage power distribution system and method

Abstract

The invention belongs to the fields of electric power system energy storage optimization and new energy energy-storage optimization, and relates to an over-charging and over-discharging protection apparatus-equipped mixed energy storage power distribution system and method having a variable time constant. The system comprises a mixed energy storage power distribution module with a variable time constant controller, a state of charge-based mixed energy storage over-charging and over-discharging protection apparatus, a storage battery energy storage module, a supercapacitor energy storage module, a photovoltaic power generation module and a direct current load. By virtue of the mixed energy storage power distribution system and method, the storage battery power high fluctuation can be lowered effectively, and the service life can be prolonged; and meanwhile, operation of the system in the fault direction can be avoided according to a power instruction and an energy storage element statematching degree over-charging and over-discharging protection strategy, so that risk of accidents can be lowered.

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...

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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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