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Synchronous detection controller and control method for grid connection of micro-grid

A technology of synchronous detection and micro-grid, applied in the direction of single-network parallel feeding arrangement, climate change adaptation, etc., can solve the problems of unsuitable micro-grid grid-connected control, poor flexibility, high cost, etc., to achieve enhanced safety and stability, The effect of simple wiring and low cost

Inactive Publication Date: 2014-01-08
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0002] Among the existing synchronous detection and control technologies for power grids, transformer-type detection methods and grid-connected relays are commonly used, which are mainly used for grid-connected control of high-voltage large power grids or large-scale power generation equipment. These devices are large in size, high in cost, and poor in flexibility. Not suitable for grid-connected control of microgrid

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  • Synchronous detection controller and control method for grid connection of micro-grid
  • Synchronous detection controller and control method for grid connection of micro-grid

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with specific embodiments.

[0020] refer to figure 1 , a microgrid grid-connected synchronous detection controller, each phase of the three-phase circuit includes a conditioning circuit module, a first-order anti-aliasing filter differential operation module, a first-order low-pass filter, a detector, a A comparator, a D flip-flop; the synchronous detection controller also includes an OR logic operation module;

[0021] The main circuit is a three-phase (A-phase, B-phase and C-phase) AC circuit, and the conditioning circuit module measures the three-phase voltage signal Vgabc of the voltage transformers PT1 and PT2 on both sides of the grid-connected control switch, that is, the micro-grid side and the public grid side Conditioned with the three-phase voltage signal Vmabc, the output signal amplitude (Vga, Vma, Vgb, Vmb, Vgc, Vmc). Vga, Vgb, Vgc The three-phase voltage signal Vgabc measured by the...

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Abstract

The invention discloses a synchronous detection controller and control method for grid connection of a micro-grid. Each phase of a three-phase circuit comprises a conditioning circuit module, a first-order anti-aliasing filter difference operation module, a first-order low-pass filter, a detector, a comparator and a D trigger. The synchronous detection controller further comprises a NOR-logic operation module; the synchronous detection controller is applied to the grid connection control of the micro-grid and a public electric network and can effectively ensure the synchronous grid connection, out-of-sync rate is limited within the acceptable range, a large transient state of the micro-grid is avoided, misoperation of a relaying protection system is avoided, safety and stability of operation of the micro-grid are enhanced, and quality of electric energy of the micro-grid is improved. Meanwhile, detection precision is high, wiring is easy, size is small, weight is light, energy consumption and cost are low, high flexibility is achieved, and the synchronous detection controller and control method for the grid connection of the micro-grid are applicable to the grid connection control of the micro-grid.

Description

technical field [0001] The present invention relates to micro-grid grid-connected control, in particular to a micro-grid grid-connected synchronous detection controller and a control method. Background technique [0002] Among the existing synchronous detection and control technologies for power grids, transformer-type detection methods and grid-connected relays are commonly used, which are mainly used for grid-connected control of high-voltage large power grids or large-scale power generation equipment. These devices are large in size, high in cost, and poor in flexibility. Not suitable for grid-connected control of microgrids. Contents of the invention [0003] The purpose of the present invention is to provide a micro-grid grid-connected synchronous detection controller and control method, which can effectively ensure synchronous grid-connected, avoid large transient occurrence of micro-grid and malfunction of relay protection system, and enhance the reliability of micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02A30/60
Inventor 苏海滨高孟泽苏丹刘江伟张璐陈振华
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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