Multi-energy complementary microgrid multi-master-slave control structure and method based on micro-source and load cooperative support

Abstract

The invention relates to the technical field of microgrids, in particular to a multi-energy complementary microgrid multi-master-slave control structure and method based on micro-source and load cooperative support. The structure comprises a photovoltaic system, a super capacitor, a wind driven generator, a battery, a gas turbine, a charging pile and a thermal load. All the micro-sources are provided with controllers, and each cold load and each heat load are also provided with controllers. When the demand is greater than the supply limit, a heat supply network converts heat energy back to electric energy, the heat supply network and the micro-source jointly provide energy for the load through a microgrid bus, the charging pile transmits the electric energy from an AC bus of the microgridto the electric vehicle battery in a bidirectional mode through bidirectional AC-DC, idle energy is fully utilized, and the output power pressure of the micro-source is reduced. And a virtual droop control strategy is adopted, so that the voltage and the frequency of the microgrid are always stabilized at the same value. Thus, the stability and the adaptability of the multi-energy complementary microgrid are improved, and the power quality of the system is improved.

Description

Technical field [0001] The invention relates to the technical field of microgrids, in particular to a multi-energy complementary microgrid multi-master-slave control structure and method based on the collaborative support of micro-sources and loads. Background technique [0002] The traditional master-slave control strategy has been widely put into practical use, mainly because its control strategy is simple and easy to use, but the overall form of a master micro source and the other as a slave micro source is too single. With the rapid development of new energy, more The scale of complementary microgrids is expanding and the micro sources are gradually becoming diversified. It is particularly difficult to use a single micro source to support its voltage and frequency benchmarks. When a multi-master-slave micro-grid structure is adopted, the main micro-source adopts the traditional droop control strategy. When the load fluctuates in the multi-energy complementary micro-grid, the ...

AI Technical Summary

Problems solved by technology

This implementation method has a single main and micro source, often requires a large storage battery, and the cost is high

[0004] If multiple master-slave forms are adopted, multiple master and micro-sources are connected to the grid, which is equivalent to multiple inverters with controlled voltage and frequency being directly connected to the same grid connection point, which will cause serious circulation

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