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Coordination control method of bipolar direct-current microgrid hybrid energy storage system

A hybrid energy storage system, DC microgrid technology, applied in AC network circuits, AC network load balancing, electrical components and other directions, can solve the problem of lack of bipolar DC bus voltage stability control methods, etc., to solve bus voltage fluctuations, Avoid frequent actions and improve power quality

Active Publication Date: 2017-05-31
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of lack of bipolar DC bus voltage stability control method at present, the present invention provides a hybrid energy storage system coordination control method suitable for bipolar DC microgrid

Method used

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  • Coordination control method of bipolar direct-current microgrid hybrid energy storage system
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  • Coordination control method of bipolar direct-current microgrid hybrid energy storage system

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Embodiment Construction

[0032] figure 1 As shown, a hybrid energy storage system of a bipolar DC microgrid includes lithium batteries, supercapacitors P and N, and converters.

[0033] The converters are three bidirectional DC / DC converters and a voltage balancer.

[0034] The lithium battery is connected to the bipolar DC bus PN with a bidirectional DC / DC converter I; the supercapacitor P is connected to the bus PO through a DC / DC converter II; the supercapacitor N is connected to the busbar PO through a DC / DC converter III On the busbar ON; the three busbars of the bipolar DC busbar are connected through a voltage balancer.

[0035] The DC / DC converter I, DC / DC converter II, and DC / DC converter III all adopt a bidirectional Boost-Buck circuit structure; the voltage balancer adopts a reverse polarity buck-boost converter circuit structure.

[0036] A control method for a hybrid energy storage system of a bipolar DC microgrid, comprising the following content:

[0037]1. The bipolar DC bus is comp...

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Abstract

The invention discloses a coordination control method of a bipolar direct-current microgrid hybrid energy storage system, and belongs to the stable operation field of bipolar direct-current microgrids. The bipolar direct-current microgrid hybrid energy storage system comprises a lithium battery, a first super-capacitor and a second super-capacitor, wherein the lithium battery is connected onto the positive line and the negative line of a bipolar direct-current bus PN through a first bi-directional DC / DC converter; the first super-capacitor is connected onto the positive line and the negative line of a bipolar direct-current bus PO through a second bi-directional DC / DC converter; the second super-capacitor is connected onto the positive line and the negative line of a bipolar direct-current bus ON through a third bi-directional DC / DC converter; and the three bipolar direct-current buses are connected through a voltage balancer. According to the coordination control method, the electric energy quality of the bipolar direct-current microgrid is improved; and frequent actions of the voltage balancer are avoided.

Description

technical field [0001] The invention belongs to the field of stable operation of a bipolar direct current microgrid, and in particular relates to a coordinated control method for a hybrid energy storage system of a bipolar direct current microgrid. Background technique [0002] At present, with the rapid development of power demand, the DC microgrid built with distributed power sources does not need to consider complex parameters such as reactive power and frequency, and has low line loss and high reliability. important way. However, distributed power generation represented by wind energy and solar energy is inherently unpredictable and intermittent; coupled with a large number of fluctuating loads in the microgrid, the quality of the grid is degraded, and even the power is seriously unbalanced. In order to improve the reliability of micro-grid operation and optimize power quality, electric energy storage technology has emerged as the times require and has become a key link...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38
CPCY02P80/14H02J3/32H02J3/382
Inventor 秦文萍张宋杰韩肖清王鹏王英贾燕冰任春光张海涛
Owner TAIYUAN UNIV OF TECH
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