An AC and DC dual-purpose energy storage power adjustment device and its control method

An AC and DC dual-purpose, power regulation technology, applied in the direction of AC network load balancing, DC network load balancing, energy industry, etc., can solve the problem that the energy storage power adjustment device cannot meet the AC and DC power conversion at the same time

Inactive Publication Date: 2018-03-09
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the traditional energy storage power adjustment device cannot satisfy the AC-DC power conversion at the same time, and proposes an AC-DC dual-purpose energy storage power adjustment device and its control method, in order to be able to be directly connected to the AC-DC bus and flexibly realized Energy conversion realizes flexible configuration and management of the energy storage system, so that the conversion of electric energy between the AC and DC buses can be used more efficiently, the efficiency of electric energy storage and transfer can be improved, and it is more beneficial to improve the stability of the AC-DC hybrid microgrid system

Method used

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  • An AC and DC dual-purpose energy storage power adjustment device and its control method
  • An AC and DC dual-purpose energy storage power adjustment device and its control method
  • An AC and DC dual-purpose energy storage power adjustment device and its control method

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Embodiment Construction

[0080] In this embodiment, an AC-DC dual-purpose energy storage power adjustment device is applied to an AC-DC hybrid microgrid, and mainly includes a power adjustment main circuit and a central controller unit;

[0081] Such as figure 1 As shown, the power regulation main circuit includes 6 cascaded H-bridge units, 6 energy storage units, AC output interface circuit and DC output interface circuit; 1≤i≤2;

[0082] 6 cascaded H-bridge units including 2 a-phase cascaded H-bridge units (H a1 ~H a2 ), 2 b-phase cascaded H-bridge units (H b1 ~H b2 ) and 2 c-phase cascaded H-bridge units (H c1 ~H c2 ); wherein, the i-th a-phase cascaded H-bridge unit includes the i-th a-phase full-bridge inverter and the i-th a-phase filter capacitor (C ai ); the i-th b-phase cascaded H-bridge unit includes the i-th b-phase full-bridge inverter and the i-th b-phase filter capacitor (C bi ); the i-th c-phase cascaded H-bridge unit includes the i-th c-phase full-bridge inverter and the i-th c-...

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Abstract

The invention discloses an AC and DC dual-purpose energy storage power regulating device and a control method thereof, including 3n cascaded H-bridge units, 3n energy storage units, an AC output interface circuit, a DC output interface circuit, and a central controller unit; The central controller unit controls the switching status of the AC circuit breaker of the AC output interface circuit and the DC circuit breaker of the DC output interface circuit, so that the energy storage device works in the energy storage inverter mode to connect to the AC grid, or works in the energy storage DC conversion mode The controller mode is used to connect to the DC grid; the central controller unit adopts the corresponding control strategy according to the working mode of the energy storage device to realize the two-way controllable flow of power. The invention can realize the flexible configuration and management of the energy storage system connected to the AC-DC hybrid microgrid by controlling the different working modes of the energy storage device, more efficiently utilize the conversion of electric energy between the AC and DC buses, and improve the efficiency of electric energy storage and transfer. Efficiency, easy to improve the stability of the AC-DC hybrid microgrid system.

Description

technical field [0001] The invention relates to the technical field of energy storage in a microgrid system, and more specifically relates to an AC and DC dual-purpose energy storage power regulating device and a control method thereof. Background technique [0002] As a new energy network supply and management technology, microgrid integrates distributed power generation units, renewable energy, energy storage devices, loads, monitoring and protection systems, etc., which can effectively optimize the operation and management of renewable energy and improve the efficiency of large power grids. The level of consumption of renewable energy. Microgrids can be divided into AC microgrids, DC microgrids, and AC-DC hybrid microgrids according to their structural characteristics. Among them, the AC-DC hybrid microgrid integrates the characteristics of the AC microgrid and the DC microgrid. The AC power supply and the AC load are connected in parallel to the AC bus, and the DC power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32H02J1/14
CPCY02P80/14
Inventor 丁明吴杰陈中朱灿赵波张雪松周金辉
Owner HEFEI UNIV OF TECH
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