Coordinated scheduling strategy for multi-element energy storage in distributed microgrid system for optical storage

A technology of multiple energy storage and coordinated scheduling, applied in the direction of AC network load balancing, reducing/preventing power oscillation, etc., can solve the problem of low energy storage power density and other issues

CN104184159BInactive Publication Date: 2016-08-24GUANGDONG YUANJING ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

A coordinated scheduling strategy for multiple energy storage in an optical storage distributed microgrid system, based on a two-stage converter topology structure for multiple 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 battery and the bidirectional DC / DC conversion unit for the super capacitor share a DC bus, and are connected to the load and the large power grid through the DC / AC conversion unit through the LC filter. The method for coordinated scheduling of two-stage converters for multiple energy storage is as follows: in the grid-connected mode of the distributed optical storage microgrid system, double filtering control is performed on the two-stage converters for multiple energy storage, and the energy storage elements are controlled. It is used to smooth the fluctuation of photovoltaic output power, and adjust the respective filtering parameters according to the state of charge of the supercapacitor and the state of charge of the battery; when the distributed optical storage microgrid system is off-grid, the energy storage element is controlled to be distributed optical storage. The microgrid system provides voltage and frequency support, and the distributed optical storage microgrid system jointly supplies power for the load; the energy storage elements are batteries and supercapacitors.
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Description

Technical field

[0001] The invention relates to a multi-element energy storage coordinated scheduling method of a distributed optical storage micro-network system. Background technique

[0002] Distributed grid-connected photovoltaics are located in the vicinity of users, which can solve the power consumption of users nearby, reduce users’ dependence on grid power supply, and reduce grid line losses; and under appropriate conditions, with the energy storage system, combined with coordinated control strategies, it can be isolated from the grid. The net 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, and ensure that photovoltaic power generation can be reliably integrated into the conventional grid. In the island operation mode, the rapid response capability of ...

Examples

Embodiment Construction

[0068] The present invention will be further described below with reference to the drawings and specific embodiments.

[0069] figure 1 It is the topological structure of the two-stage converter for multi-element energy storage used in the method of the present invention. The two-stage converter for multiple energy storage includes a front-stage bidirectional DC / DC conversion unit and a rear-stage DC / AC conversion unit. The two-way DC / DC conversion unit for the battery and the two-way DC / DC conversion unit for the super capacitor share a DC bus. The battery and the super capacitor are connected to the two-way DC / DC conversion unit for the battery and the two-way DC / DC conversion unit for the super capacitor respectively. 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.

[0070] figure 2 Is the second filter parameter T 2 Adjustment flow chart, when P hes > At 0, the...