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AC and DC dual-use energy storage and power regulation device and control method thereof

An AC-DC dual-purpose, power regulation technology, applied in the direction of AC network load balancing, load balancing in DC network, energy industry, etc.

Inactive Publication Date: 2016-05-11
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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  • AC and DC dual-use energy storage and power regulation device and control method thereof

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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-use energy storage and power regulation device and a control method thereof. The device comprises 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 on-off state of an AC circuit breaker of the AC output interface circuit and a DC circuit breaker of the DC output interface circuit is controlled through the central controller unit, the energy storage device works in an energy storage inverter mode to be accessed to an AC power grid, or works in an energy storage DC converter mode to be accessed to a DC power grid; and the central controller unit adopts a corresponding control strategy to realize power dual-way controllable flow according to the work mode of the energy storage device. Through controlling different work modes of the energy storage device, the phenomenon that the energy storage system is accessed to an AC and DC hybrid microgrid is configured and managed flexibly, conversion of the power between AC and DC buses is realized more high efficiently, the power storage and transfer efficiency is improved, and the stability of the AC and DC hybrid microgrid is improved.

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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IPC IPC(8): H02J3/32H02J1/14
CPCY02P80/14H02J3/32H02J1/14
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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