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An AC-DC hybrid microgrid system and its control method

An AC-DC hybrid and control method technology, which is applied to the AC-DC hybrid microgrid system and its control field, can solve the problems of the complex structure of the AC-DC hybrid microgrid system, the inability to complete the DC microgrid, and the development limitations, so as to improve the reception capacity. , Improve the service life and improve the effect of operating efficiency

Active Publication Date: 2016-12-28
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

Due to the complex structure and numerous components of the AC-DC hybrid microgrid system, its control is difficult, which limits its development to a certain extent.
[0003] At present, the existing microgrid control methods are mainly aimed at the control of traditional AC microgrids, and these methods cannot complete the control of DC microgrids.

Method used

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  • An AC-DC hybrid microgrid system and its control method
  • An AC-DC hybrid microgrid system and its control method

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] See attached figure 1 , the AC-DC hybrid microgrid system consists of a DC microgrid and an AC microgrid, wherein the DC sub-microgrid includes a DC converter, a first photovoltaic module, a first storage battery, a DC load, and a microgrid DC bus. The first photovoltaic module and the first storage battery are respectively connected to the DC bus through the DC converter and the tie switch in sequence, and the DC load is connected to the DC bus through the tie switch;

[0028] The AC sub-microgrid includes an inverter, a second photovoltaic module, a supercapacitor, a second battery, an AC load, a static var compensation device (SVG), an active filter device (APF) and an AC busbar of the microgrid. The second photovoltaic module, supercapacitor, and second storage battery are respectively connected to the AC bus through the inverter and the tie switch, the sta...

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Abstract

The invention discloses an AC-DC hybrid micro-grid system and a control method thereof. The system includes a photovoltaic module, an inverter, a DC converter, a storage battery, a super capacitor, an AC load, a DC load, a DC bus, an AC bus, SVG and APF, etc.; the control method includes the following steps: first detect the voltage and frequency of the main grid, and if it is normal, the system adopts grid-connected operation; otherwise, it adopts island operation; Constant voltage control is adopted. If the system operates in an isolated island, the energy storage inverter and supercapacitor with the largest capacity shall be controlled by V / F, the rest of the inverters shall be controlled by PQ, and the DC converter shall be controlled by constant voltage; finally, to ensure the normal operation of the system To ensure that the energy storage capacity is within the optimal range. The invention solves the operation control of a typical AC-DC hybrid micro-grid system, improves the reliability, safety and economy of the system, and improves the utilization efficiency of renewable energy.

Description

technical field [0001] The invention belongs to the technical fields of renewable energy power generation, AC-DC hybrid micro-grid control and micro-grid application, and relates to a micro-grid control method, in particular to an AC-DC hybrid micro-grid system and a control method thereof. Background technique [0002] With the promotion and utilization of renewable energy, the microgrid has developed rapidly due to its advantages of flexible dispatchability, reliability of power supply efficiency, and independence of local electricity demand. The DC microgrid has also attracted widespread attention due to its significant advantages such as high utilization rate of renewable energy and low investment cost. However, since most of the current domestic loads are AC loads, there is less demand for a separate DC microgrid, so it has both The advantages of the AC-DC hybrid microgrid will be born because of this. Due to the complex structure and numerous components of the AC-DC h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/02
CPCH02J3/32Y02E70/30H02J2300/24H02J3/381Y02E10/56Y04S20/222Y02B70/3225H02J3/388
Inventor 高志强孟良梁宾范辉胡文平李宣义李士林徐俊杰
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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