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A DC microgrid secondary voltage regulation system and its control method

A DC micro-grid and secondary voltage regulation technology, applied in the direction of parallel operation of DC power supplies, can solve problems such as the inability to adjust the DC bus voltage to its rated value, and improve the quality of load power supply and system operation efficiency, fast response, The effect of long cycle life

Active Publication Date: 2018-08-21
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the traditional DC microgrid droop voltage regulation system cannot adjust the DC bus voltage to its rated value, the present invention provides a DC microgrid secondary voltage regulation system and its control method

Method used

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  • A DC microgrid secondary voltage regulation system and its control method
  • A DC microgrid secondary voltage regulation system and its control method
  • A DC microgrid secondary voltage regulation system and its control method

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Embodiment Construction

[0048] A secondary voltage regulation system for DC microgrid, including a vanadium battery energy storage system and a voltage regulation controller;

[0049] The vanadium battery energy storage system includes a vanadium battery, a bidirectional DC / DC converter, and a vanadium battery detector;

[0050] The vanadium battery is connected to the DC bus through a bidirectional DC / DC converter; the vanadium battery detector is connected to the vanadium battery;

[0051] The voltage regulating controller is connected with the DC bus, the vanadium battery detector, the bidirectional DC / DC converter in the vanadium battery energy storage system, the second bidirectional DC / DC converter in the hybrid energy storage system, and the bidirectional DC in the grid-connected system. / AC converter connection.

[0052] A control method of a DC microgrid secondary voltage regulation system (the method is implemented based on the DC microgrid secondary voltage regulation system of the present inventi...

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PUM

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Abstract

The invention relates to a direct-current micro-grid voltage regulation system and particularly relates to a direct-current micro-grid secondary voltage regulation system and a control method thereof, aiming at the solving the problem that voltage of a direct-current bus cannot be regulated to a rated value by a traditional direct-current micro-grid droop voltage regulation system. The direct-current micro-grid voltage regulation system comprises a vanadium battery energy storage system and a voltage regulation controller, wherein the vanadium battery energy storage system comprises a vanadium battery, a bidirectional DC / DC (Direct Current / Direct Current) converter and a vanadium battery detector; the vanadium battery is connected with the direct-current bus through the bidirectional DC / DC converter; the vanadium battery detector is connected with the vanadium battery; and the voltage regulation controller is connected with the direct-current bus, the vanadium battery detector, the bidirectional DC / DC converter in the vanadium battery energy storage system, a second bidirectional DC / DC converter in a mixed energy storage system, and a bidirectional DC / AC (Direct Current / Alternating Current) converter in a connected-grid system. The direct-current micro-grid secondary voltage regulation system is suitable for direct-current micro-grids.

Description

Technical field [0001] The invention relates to a DC micro-grid voltage regulation system, in particular to a DC micro-grid secondary voltage regulation system and a control method thereof. Background technique [0002] Because of its simple control method, DC microgrid does not need to consider reactive power, frequency, phase synchronization, and can operate in islands and grid-connected operation. It has received extensive attention in recent years. Such as figure 1 As shown, the DC microgrid involved in the present invention is composed of a DC bus, a photovoltaic power generation system, a hybrid energy storage system (HESS), a grid-connected system and a load part. Among them, the photovoltaic power generation system is composed of photovoltaic arrays and boost converters. The hybrid energy storage system consists of a lithium battery pack, a first bidirectional DC / DC converter, a super capacitor, and a second bidirectional DC / DC converter. The grid-connected system consi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/12
CPCH02J1/12
Inventor 韩肖清任春光米芝昌王鹏
Owner TAIYUAN UNIV OF TECH
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