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

A technology of over-discharge protection and hybrid energy storage, applied in battery over-charge protection, battery over-discharge protection, circuit devices, etc., can solve the problems of over-charge and over-discharge of batteries and supercapacitors, without considering batteries and supercapacitors, etc.

Active Publication Date: 2018-05-08
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 betwee

Method used

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

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Embodiment

[0098] In this example, if figure 1 As shown, the photovoltaic is used as the internal distributed power supply of the system; the DC load is used as the load terminal; the lithium battery is used as the energy unit; the supercapacitor is used as the power unit; the energy storage element controller uses a DC-DC converter.

[0099] The lithium battery energy storage unit and its control module and the supercapacitor energy storage unit and its control module are connected in parallel to the DC bus;

[0100] The hybrid energy storage overcharge and overdischarge protection device based on the state of charge collects state data from the battery and super capacitor, formulates an overcharge and overdischarge protection strategy, forms a power correction control command, and inputs it to the hybrid energy storage power distribution module with a variable time constant controller. ;

[0101] The hybrid energy storage power distribution module with a variable time constant control...

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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...

Claims

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Application Information

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IPC IPC(8): H02J7/35H02J7/00
CPCH02J7/0077H02J7/0029H02J7/345H02J7/35H02J7/00302H02J7/00306Y02E10/56
Inventor 葛维春张艳军高凯葛延峰苏安龙何晓洋韩子娇曾辉史航睿杨珺孙秋野肖军刘鑫蕊张涛张强刘罡
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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