Micro-grid frequency adjustment control method and system

Abstract

The invention relates to a micro-grid frequency adjustment control method and system. When a micro-grid is operated in an off-grid isolated island mode, distributed measurement elements are used for measuring voltage, frequency and power real-time signals in real time, and the signals are uploaded to a computer; the computer is used for analyzing and processing the uploaded signals; when output power of a power supply is greater than a load power, a signal for reducing the output power of the power supply is sent out; when the load requirement cannot be met, a signal for removing a certain unimportant load is sent out; distributed power supply power control equipment or load control equipment acts respectively according to the signals sent by the computer, and the frequency adjustment of the micro-grid is realized. With the adoption of the micro-grid frequency adjustment control method and system disclosed by the invention, the equipment capable of quickly releasing energy can release energy instantaneously at the moment that the micro-grid is operated in an off-grid isolated island mode, rapid fluctuation of voltage and frequency is suppressed; and when the micro-grid is stably operated in an off-grid isolated island mode, frequency stabilization of the micro-grid is maintained by controlling the output power of the distributed power supply and removing the load, so that the power generated by the power supply of the micro-grid is balanced with the power among the loads of the micro-grid.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and relates to a micro-grid frequency adjustment control method and system. Background technique [0002] At present, photovoltaic power generation, wind power generation, biomass power generation, tidal power generation, and energy storage systems represented by batteries and supercapacitors have been widely used. These power generation systems and the loads in their areas together constitute a micro-grid. There are two different operation modes of the microgrid, namely the network operation mode and the island operation mode. In the network operation mode, the distributed generation system is in the grid-connected operation state. Run at maximum output. Since the capacity of the existing distributed power generation system is small compared to the entire grid of the system, the main grid is fully capable of effectively controlling the voltage and frequency. At this time, the voltage...

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Problems solved by technology

When there is a failure outside the microgrid and the main grid cannot supply power to the microgrid, or even its failure will threaten the safety of the microgrid, it is necessary to isolate the system from the microgrid in time, form an island and operate independently (island operation), island operation mode The lower micro-grid is very fragile. When the output power of the power supply is less than the rated load power, the frequency and voltage in the micro-grid will decrease; Stable operation, even if the output power is just equal to the rated power of the load at this time, the increase or decrease of the load will still cause the system to be unstable

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