Economic dispatching method for AC/DC hybrid micro-grid considering prediction errors

Abstract

An economic dispatching method for an AC / DC hybrid micro-grid considering prediction errors belongs to the field of AC / DC hybrid micro-grid. The economic dispatching method includes a day-ahead dispatching stage, an intra-day pre-dispatching stage and an intra-day dispatching stage. The day-ahead dispatching stage includes the following contents: (1) a day is divided into 24 periods according to hours, and the power output and absorption of each distributed unit in each period are fixed; (2) the generating power of wind turbines, the photovoltaic generating power, the fluctuation of AC important loads and the fluctuation of DC important loads in each period of the next day are predicted; and (3) a mathematical model of distributed generation is established. The problems of incomplete consideration of the operation state of the AC-DC hybrid micro-grid in the existing research, errors in prediction of the distributed generation and load of the AC-DC hybrid micro-grid, and difficulty in realizing intra-day economic dispatch of the AC-DC hybrid micro-grid are solved.

Description

technical field [0001] The invention belongs to the field of AC-DC hybrid micro-grids, and in particular relates to an AC-DC hybrid micro-grid economic scheduling method considering prediction errors. Background technique [0002] The AC-DC hybrid microgrid can not only efficiently solve the problem of large-scale decentralized access of distributed power sources, but also serve as a useful supplement to the traditional power grid. It is an effective carrier for distributed power generation to be accepted and utilized by traditional power grids. The AC-DC hybrid microgrid is divided into an AC area and a DC area, and the AC area and the DC area coordinate with each other. Under the premise of power balance, each distributed system conducts optimal power dispatch among distributed power generation (DER), energy storage and load, so as to optimize the operation of the AC-DC hybrid microgrid. [0003] For the economically optimized operation of the AC / DC hybrid microgrid, the ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that there is an error between the day-ahead forecast of distributed power sources and loads in the AC-DC hybrid microgrid and the actual operation of the day, which makes the microgrid unable to achieve economic dispatch within the day

The invention takes into account the coordinated control of the AC area and the DC area in the AC-DC hybrid microgrid and the economy and reliability of the operation of the microgrid. In view of the existing research, there are errors in the day-ahead prediction and intraday operation of the AC-DC hybrid microgrid, and the operating state is not considered. In order to solve the problems of comprehensiveness and insufficient economic efficiency of intraday dispatching strategy of AC / DC hybrid microgrid, an economical dispatching method of AC / DC hybrid microgrid considering prediction error was established.

Images