Multiple time scale control method of exchange power of microgrid and power distribution network

Abstract

The invention discloses a multiple time scale control method of exchange power of a micro grid and a power distribution network. The multiple time scale control method comprises the following steps of formulating a micro grid exchange power control curve at present and issuing to a micro grid energy management system according to operating data of the micro grid and daily scheduling plans of the power distribution network; and enabling the micro grid energy management system to judge whether output power of each power supply in the micro grid is scheduled or not to enable real-time exchange power to meet scheduling requirements in a setting adjustment period. The multiple time scale control method controls the exchange power of the micro grid and the power distribution network in multiple time scales, effectively reduces adverse effects on the power distribution network caused by micro grid connection, improves acceptance capability of the power distribution network on renewable energy sources, promotes development of using of the renewable energy sources, improves issuing mode of scheduling instructions, meets actual scheduling habits of power distribution automation, introduces super-short-term power generation prediction and super-short-term load prediction during true time control, and can effectively avoid problems such as adjusted oscillation and frequent adjustment.

Description

Technical field [0001] The invention belongs to the technical field of power distribution network dispatching and management, renewable energy power generation and microgrid applications, and relates to a method for controlling power exchange between a microgrid and a power Time scale control method. Background technique [0002] Microgrid is a low-voltage system composed of distributed power generation, energy storage and load. The power supply inside the microgrid is mainly realized by power electronic equipment to realize the conversion of electric energy and provide necessary control. Compared with the external grid, the microgrid is a single autonomous controlled unit, which can be regarded as a load or a power source. [0003] However, because the traditional power distribution network has been formed for a long time, the general construction of the power distribution network does not consider connecting the power supply to the feeder line. The access of microgrids has...

AI Technical Summary

Problems solved by technology

However, the control method proposed in this patent is limited to a single time scale, that is, real-time adjustment, and dispatching instructions are issued according to time periods, which cannot meet the actual dispatching needs of distribution automation for microgrids

Moreover, the patent only bases on the current system operation data when performing real-time adjustment, and does not perform ultra-short-term power generation forecast and ultra-short-term load forecast. In the actual process, problems such as adjustment oscillation and frequent adjustment are prone to occur.

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