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Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system

An optical storage microgrid and multi-energy storage technology, which is applied in the direction of AC network load balancing, reducing/preventing power oscillation, etc., and can solve the problems of low energy storage power density and other issues

Inactive Publication Date: 2014-12-03
GUANGDONG YUANJING ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage of low power density of the existing single battery energy storage, and propose a coordinated scheduling strategy for multi-element energy storage in a distributed optical storage micro-grid system

Method used

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Embodiment Construction

[0072] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0073] figure 1 The topology of the dual-stage converter for hybrid energy storage used in the method of the present invention. The dual-stage converter for hybrid energy storage includes a front-stage bidirectional DC / DC conversion unit and a rear-stage DC / AC conversion unit. The bidirectional DC / DC conversion unit for the storage battery and the bidirectional DC / DC conversion unit for the supercapacitor share a DC bus. Connect the DC / AC conversion unit, connect the AC bus through the DC / AC conversion unit, and then connect the load and the large power grid through the LC filter.

[0074] figure 2 is the second filter parameter T 2 regulation flow chart, when P hes When >0, the supercapacitor is in the discharge state, and the second filter parameter T 2 According to the state of charge SOCsc of the supercapacitor, the adjustment is divided into the...

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Abstract

Provided is a co-scheduling strategy for multiple energy storage in a distributed light storage micro-gird system. The based multiple energy storage adopts a two-stage converter topology structure comprising a preceding-stage bidirectional DC / DC conversion unit and a back-stage DC / AC conversion unit. A bidirectional DC / DC conversion unit for a storage battery and a bidirectional DC / DC conversion unit for a super capacitor share a DC bus, and are connected with a load and a large power grid through the DC / AC conversion unit and via an LC filter. The co-scheduling method of a two-stage converter for multiple energy storage is characterized by when the distributed light storage micro-gird system is in a grid-connected mode, carrying out double filter control on the two-stage converter for multiple energy storage, controlling the energy-storage element to carry out smooth photovoltaic output power fluctuation, and carrying out adjustment on filtering parameters according to the charge state of the super capacitor and the charge state of a storage battery; and when the distributed light storage micro-gird system is in an off-grid state, controlling the energy-storage element to provide voltage and frequency support to the distributed light storage micro-gird system, the distributed light storage micro-gird system jointly providing power for the load, wherein the energy-storage element is the storage battery and the super capacitor.

Description

technical field [0001] The invention relates to a multi-element energy storage collaborative scheduling method for a distributed optical storage micro-grid system. Background technique [0002] Distributed grid-connected photovoltaics are located near the user, which can solve the user's electricity consumption nearby, reduce the user's dependence on the grid power supply, and reduce the loss of the grid line; and under appropriate conditions, with the energy storage system and the coordinated control strategy, it can be separated from the grid to form an isolated The network operates independently. [0003] When distributed photovoltaic power generation is connected to the grid, the energy storage system can be used to effectively reduce the negative impact of grid-connected photovoltaic power generation output power fluctuations on the grid, ensuring that photovoltaic power generation can be reliably integrated into the conventional power grid. In the island operation mod...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/24
Inventor 戴学济孙志强
Owner GUANGDONG YUANJING ENERGY
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