AC micro-grid based on positive and negative impedance relay protection

Abstract

The invention discloses an alternating-current micro-grid based on forward and reverse impedance relay protection, and the micro-grid is characterized in that a forward and reverse impedance relay protection control system and an energy management system (a meteorological data acquisition system and a video monitoring workstation) are introduced to regulate and control the alternating-current micro-grid, a distributed power supply is used as an energy source, and multi-energy complementation is adopted; through the supplement of photovoltaic power generation or fan power generation and diesel engine power generation, a miniature power supply system with rated capacity is scientifically and reasonably output outwards, and the control schematic diagram of the miniature power supply system is shown in the abstract figure 1. By constructing the alternating-current micro-grid based on forward and reverse impedance relay protection, the power supply reliability of the micro-grid is improved, the power supply problem of regions where new energy can be utilized is effectively solved, the investment and operation cost can be reduced as much as possible, the generation of harmful gas is reduced, and the micro-grid is a scientific and reasonable effective power supply mode for new energy available areas in China.

Description

technical field [0001] The invention relates to an AC microgrid based on forward and reverse direction impedance relay protection, and belongs to the technical field of electric power industry. Background technique [0002] In China, the research on microgrid started relatively late, and it is still lagging behind compared with other developed countries in the world. Areas not covered by large power grids generally adopt diesel power generation and implement power supply within an independent area. This power supply method has many disadvantages, such as: poor reliability of power supply, high power supply cost, loud power generation noise, and at the same time, a large amount of harmful gases are generated, polluting the regional environment. [0003] The existing microgrid forms include AC microgrid, DC microgrid and AC / DC hybrid microgrid. This AC microgrid based on forward and reverse impedance relay protection is a useful supplement to power supply in areas where new e...

AI Technical Summary

Problems solved by technology

Areas not covered by large power grids generally use diesel power generation to implement power supply in an independent area. This power supply method has many disadvantages, such as: poor reliability of power supply, high power supply cost, loud power generation noise, and a large amount of harmful gases at the same time, polluting the regional environment

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