Alternating current and direct current hybrid microgrid networking system applicable to large power wind/photoelectricity absorption

Abstract

The invention discloses an alternating current and direct current hybrid microgrid networking system applicable to large power wind / photoelectricity absorption. The alternating current and direct current hybrid microgrid networking system comprises at least one wind power plant, at least one photoelectric power station, at least one large-capacity power transformation system, at least one DC / DC converter, a first alternating current bus, a first direct current bus, a wind power delivery wire, a photoelectric delivery wire, at least two microgird units and a system-level dispatching center. Thefirst alternating current bus is connected into the wind power plant through the large-capacity electric transformation system, and then electric energy is transmitted to all microgrid units throughthe wind power delivery wire; the first direct current bus is connected into the photoelectric power station through the DC / DC converter, and the electric energy is transmitted to all the microgrid units through the photoelectric delivery wire. By means of the alternating current and direct current hybrid microgrid networking system, multiple microgrid units which have a poor new energy absorbingcapability can be networked, a multilayer control structure is adopted, wind / light complementation is fully utilized, support is provided for absorption of the large-capacity wind power, the capacity-expansion requirement of an electric vehicle for a power grid is met, various renewable energy sources can also be utilized to the greatest extent, the influence of new energy absorption on a large power grid is lowered, and the system reliability and stability are improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to an AC-DC hybrid micro-grid networking system suitable for high-power wind / photoelectric consumption. Background technique [0002] In recent years, in the power system around the world, the contribution ratio of each power generation mode to the total power generation is constantly changing, and the proportion of new energy power generation in the total power generation is gradually increasing, and there is a continuous upward trend. At the same time, the development of electric vehicles has been valued by various countries, and policies related to electric vehicles have also emerged in due course. Therefore, vigorously develop new energy power generation and electric vehicles, replace traditional thermal power generation with wind power and photovoltaic power generation that are not polluting to the environment, and replace traditional fuel vehicles with zero-emi...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies existing in the prior art, in order to solve the problems that high-power wind power is difficult to accommodate, and the charging load of electric vehicles requires high distribution network capacity and power generation capacity, the present invention proposes an AC-DC system suitable for high-power wind / photoelectric consumption. The hybrid micro-grid networking system combines multiple micro-grid units that are not strong in absorbing new energy into a network, adopts a multi-layer control structure, and makes full use of wind / solar complementarity, which not only provides support for large-capacity wind power consumption, but also satisfies The capacity increase requirements of electric vehicles on the power grid can also maximize the use of various renewable energy sources, reduce the impact of new energy consumption on the large power grid, and improve the reliability and stability of the system

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