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A seamless switching control system and method based on a hybrid control strategy

A control system and seamless switching technology, which is applied in the direction of AC network circuits, electrical components, single-network parallel feeding arrangements, etc., can solve the problems of micro-grid systems that cannot work, and achieve the effect of improving reliability and improving the quality of load voltage

Inactive Publication Date: 2019-10-11
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned problem that the main inverter fails and the whole microgrid system cannot work in the improved indirect current control, and proposes a seamless switching control system and method based on a hybrid control strategy, which can realize inverters in parallel The seamless switching between the grid mode and the island mode improves the quality of the load voltage during the switching process, and in the island mode, the microgrid system operates in a multi-master and multi-slave structure, which improves the reliability of the system

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  • A seamless switching control system and method based on a hybrid control strategy

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] A seamless switching control system based on a hybrid control strategy includes a three-phase inverter, the output of the three-phase inverter is connected to an LC filter, and the capacitor C of the LC filter f There is a load in parallel, and the downstream of the LC filter passes the line impedance L g Connect the grid switch S i , grid-connected switch S i Downstream through the grid protection switch S u Connected to the grid, the inverter includes a single master inverter and two slave inverters, and a single master inverter and two slave inverters operate in parallel.

[0025] A seamless switching control system based on a hybrid control strategy is, when the power grid is normal, the grid-connected switch S i and grid protection switch S u Both are closed, the inverter runs in parallel with the grid, and flows through the grid-connected inductance L...

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Abstract

The invention discloses a seamless switching control system and method based on a hybrid control strategy. The system and method can realize automatic switching from current source control to voltage source control based on droop control of an inverter when switching from grid-connected operation to isolated island operation, thereby improving load voltage quality in the process of switching from a grid-connected mode to an isolated island mode. Slave inverters are divided into two kinds, wherein the first kind of slave inverters are based on conventional PQ control and adopt current source control, and are named as slave inverters-type 1; and the other kind of slave inverters are based on PQ control and droop control, and are named as slave inverters-type 2. When island occurs, the slave inverter-type 2 is switched from the PQ control to the droop control and operates in a voltage source mode, and can realize power equalization without fast communication lines; and the slave inverter-type 2 can serve as a main inverter after switching to the droop control, thereby playing a role in maintaining grid voltage amplitude and frequency stability. Existence of a plurality of main inverters enhances reliability of a micro-grid system during isolated island operation.

Description

technical field [0001] The invention belongs to the research field of grid-connected inverter control, and in particular relates to a seamless switching control system and method based on a hybrid control strategy. Background technique [0002] With the deepening of the environmental and energy crisis, new energy power generation has received more and more attention and application, and the grid-connected inverter is an indispensable interface device for the new energy power generation system to transmit electric energy to the grid. The performance of the inverter will have an important impact on the stability of the power generation system and the grid. [0003] When the grid is normal, the grid-connected inverter should be able to run in parallel with the grid, and supply power to the load together with the grid. When the grid fails, the distributed generation unit should immediately disconnect from the grid and supply power to the load independently, forming an island ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/44
CPCH02J3/381H02J3/388H02J3/44
Inventor 刘进军孟鑫刘增武腾王施珂刘宝谨
Owner XI AN JIAOTONG UNIV
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