A reliable virtual synchronous machine multi-machine parallel synchronous grid connection method and system

A virtual synchronous machine, a reliable technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of multi-virtual synchronous machine output unevenness, failure, multi-machine synchronization time is long, etc., to achieve uniform output, ensure effectiveness, improve The effect of simultaneous success rate

Active Publication Date: 2021-05-07
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, the present invention provides a reliable multi-machine parallel synchronous grid connection method and system of virtual synchronous machines, which solves the problem of uneven output between multiple virtual synchronous machines and synchronous failure caused by too long multi-machine synchronous time The problem

Method used

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  • A reliable virtual synchronous machine multi-machine parallel synchronous grid connection method and system
  • A reliable virtual synchronous machine multi-machine parallel synchronous grid connection method and system
  • A reliable virtual synchronous machine multi-machine parallel synchronous grid connection method and system

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Experimental program
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Effect test

Embodiment 1

[0047] A reliable virtual synchronous machine multi-machine parallel synchronous grid connection method, including steps:

[0048] Step 1: After the synchronous device receives the synchronous grid-connected command, it sets the synchronous adjustment flag, and starts synchronous timing, reads the voltage and frequency on both sides of the grid-connected switch, and according to the voltage difference and frequency difference between the two sides and the set voltage difference The relationship between the frequency difference threshold and the broadcast information content is obtained, and the communication broadcast is performed to multiple virtual synchronous machines participating in the same period;

[0049] The broadcast information includes synchronous adjustment signs, increase / decrease / maintain frequency commands, increase / decrease / maintain voltage commands, frequency increase times, frequency decrease times, boost times, voltage drop times, adjustment times (including...

Embodiment 2

[0085] The present invention will be described by taking the synchronous grid connection of multiple virtual synchronous machine parallel microgrid systems as an example.

[0086] The synchronization system consists of a synchronization device installed near the grid-connected switch and multiple virtual synchronization machines scattered in the microgrid. The synchronization device and virtual synchronization machines are connected through communication lines.

[0087] Step 1: The synchronous device receives the synchronous grid-connected closing command from the background, first sets the synchronous adjustment flag, starts the synchronous timing, and reads the grid voltage Ug, grid frequency Fg, and micro-grid voltage Um on both sides of the grid-connected switch. Micro-grid frequency Fg, and judge the frequency difference of pressure difference on both sides, the judgment is: Um-Ug<-Uset1, then set the voltage boost command, and add 1 to the voltage boost times; Fm-Fg<-Fset...

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Abstract

The invention discloses a reliable method and system for multi-machine parallel synchronous grid connection of virtual synchronous machines. The synchronous device reads the voltage and frequency on both sides of the grid-connected switch, and according to the voltage difference and frequency difference between the two sides and the set voltage difference and The relationship between the frequency difference thresholds, the content of the broadcast information is obtained, and the virtual synchronous machine communicates and broadcasts; each virtual synchronous machine analyzes the broadcast information, and if it has been set, it comprehensively judges the voltage and frequency targets that need to be adjusted according to the broadcast information , and adjust the voltage and frequency according to the target; then the synchronizing device waits for the specified time to judge whether the current synchronization is overtime, and the synchronization ends when the timeout expires. Then check the synchronization point and close the gate, otherwise, check the adjustment effect, perform single machine polling or repeat the last broadcast or repeat the above process according to the check result. The invention can ensure the uniform output of each virtual synchronous machine and improve the success rate of synchronizing.

Description

technical field [0001] The invention relates to the technical field of new energy power generation and smart micro-grid, in particular to a method and system for reliable multi-machine parallel connection and synchronous grid connection of virtual synchronous machines. Background technique [0002] The power electronic converter device using virtual synchronous machine technology (hereinafter referred to as virtual synchronous machine) has been widely used in application scenarios such as new energy generation side, power distribution side, and smart microgrid. Usually, the above application scenarios require virtual The synchronous machine can operate in both grid-connected mode and off-grid mode, and can realize online seamless switching of these two modes. Generally speaking, the transition from off-grid mode to grid-connected mode requires synchronous adjustment of the virtual synchronous machine, and the off-grid bus can be integrated into the grid only after it meets t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/42
CPCH02J3/42
Inventor 王俊辉王腾飞宋飞孙海洋曹鹏刘良尹航王小红侯凯杨合民
Owner NARI TECH CO LTD
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