Reliable virtual synchronous machine multi-machine parallel synchronous grid connection method and system
A virtual synchronous machine and reliable technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of uneven output, failure, and long synchronization time of multiple virtual synchronous machines, so as to achieve uniform output, ensure effectiveness, and improve Concurrent success rate effect
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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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