Distributed hybrid power supply intelligent grid system and control method

Abstract

The present invention relates to a distributed hybrid powered smart grid system and control method thereof, which belongs to the technical field of new energy power generation and electrical technology. A flywheel set is used to adjust the frequency of grid-connected inverter power of the system so that power frequency fluctuation, compared with that of other grid-connected inverter power generation system, is reduced by 10%. Switching between constant charge and floating charge of batteries is realized by reasonable arrangement of the batteries, so service life of the batteries is extended by 20%. Capabilities of fault recovery and fault detection of the system are enhanced by control of the protective system, and service life of the system is 1000 h longer than that of systems without the protective system. Black start control of the system can enable the system to successfully and safely recover operation after the system completely shuts down, so recovery capability of the system is further improved, and impact to system loads and the grid because of overvoltage and overcurrent during system start is reduced. That smart grid system comprises as an essential component a battery storage having layers of battery packs connected to each other so that groups of them can be appropriately charged.

Description

technical field [0001] The invention belongs to the field of new energy power generation and electrical technology, and in particular relates to a distributed hybrid power supply type smart grid system and a control method. Background technique [0002] With the increasingly severe energy crisis and increasingly prominent environmental problems, clean and renewable new energy power generation technology has become a hot spot of concern. As a way to utilize new energy—the development of new energy distributed power generation systems is a hot spot among hot spots . The characteristic of the new energy distributed power generation system is that the power capacity generated by the system itself is very small, distributed near the load, and it is mainly a power generation system for the purpose of satisfying the power consumption of the surrounding load. Different from the traditional centralized power generation, power transmission and power distribution, the distributed powe...

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Problems solved by technology

The technology of wind-solar complementary distributed grid-connected power generation system is still in the research stage. Problems such as poor quality of inverter output power, large power fluctuations, and unstable power frequency have always been the main obstacles to the development of wind-solar complementary distributed grid-connected power generation systems. factor

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