Off-network control method for micro-grid

Abstract

The invention relates to an off-network control method for a micro-grid. The method comprises the following steps of traversing five small photovoltaic power sources and then traversing pair-wise combinations of the five small photovoltaic power sources when Ppcs is greater than 20kW; removing the small photovoltaic power sources exceeding a certain power range; traversing three large photovoltaic power sources, and then traversing pair-wise combinations of the three large photovoltaic power sources; removing the large photovoltaic power sources exceeding a certain power range; feeding all the photovoltaic power sources when the Ppcs is smaller than minus 20kW; and removing loads exceeding a certain power range. According to the method, the renewable energy in the micro-grid is regulated, the loads in the micro-grid are removed when in necessary, and PCS power is in a suitable work range. The problems that the isolated grid frequency control difficulty and the voltage control difficulty of the micro-grid are high, and the running safety and the running safety of the micro-grid are affected are solved.

Description

technical field [0001] The invention relates to the field of microgrid technology, in particular to an off-grid control method of the microgrid. Background technique [0002] A microgrid is a small power system composed of distributed power sources, energy conversion devices, loads, monitoring and protection devices, etc. A microgrid can either run in parallel with the larger power grid or independently supply the electricity needs of local loads. The microgrid can operate both on-grid and off-grid, which greatly improves the reliability of power supply on the load side. By connecting the microgrid to the power grid, the internal fluctuations of the microgrid can be stabilized and absorbed, and the impact of the distributed power supply connected to the grid can be reduced. In addition, the optimal combination of distributed power supply and distributed energy storage can improve the consumption of distributed power supply. Therefore, the microgrid has become one of the be...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a microgrid off-grid control method to ensure that the power of the energy storage management system is within the appropriate working range, so that the microgrid can operate stably and reliably, so as to solve the frequency and voltage control of the isolated microgrid Difficult, affecting the reliability and security of microgrid operation

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