Closed loop control method comprising multi-microgrid power distribution network

Abstract

The invention discloses a closed loop control method comprising a multi-microgrid power distribution network. A micorgrid is subjected to equivalence processing to establish a power distribution network closed loop optimization control model which takes the microgrid into the account; active and reactive output of the microgrid is used as a control variable; the minimum voltage difference of two sides of a switching-on point is used as a control target; a constraint condition comprises power balance constraint, node voltage upper and lower limit constraint, the limiting value of the active and reactive output of the microgrid and the maximum allowing tide constraint of a line; the genetic algorithm of a belt sparse block migration strategy is combined to carry out optimization regulation on the operation state of each microgrid; and the voltage difference of two sides of a closed loop point can be effectively reduced so as to reduce closed loop current and improve the success rate of the loop closing operation. The closed loop control method has the advantage of comprehensive model, the microgrid controllability can be fully utilized, and the theoretical basis can be provided for the thermal conductivity loop closing operation after the microgrid is accessed into the power distribution network.

Description

technical field [0001] The invention relates to a control method for loop closing of a distribution network, in particular to a loop closing control method for a distribution network containing multiple microgrids. Background technique [0002] Since the microgrid integrates a variety of distributed power sources, loads, energy storage devices and control systems, it has self-organizing characteristics and good flexibility. After connecting to the distribution network, it can realize nearby power supply, which can effectively avoid the power generated by long-distance transmission. loss. Therefore, the microgrid is recognized as a scientific way for distributed power to connect to the distribution network. Under the current trend of vigorously developing UHV large power grids in my country, the microgrid is still regarded as a beneficial supplement to the traditional power system by the academic and engineering circles, and As a research direction with considerable developme...

AI Technical Summary

Problems solved by technology

From a mathematical point of view, loop closing optimization control is a typical nonlinear multi-objective multi-constraint optimization problem. For this kind of problem, people have proposed a variety of artificial intelligence optimization methods such as genetic algorithm, particle swarm algorithm, and ant colony algorithm. Among them, genetic algorithm It is the earliest and most well-developed method proposed, but like other population evolutionary algorithms, the genetic algorithm still has a precocious phenomenon that is difficult to overcome, and it is easy to fall into a local optimum, which affects the global convergence performance of the algorithm.

In short, at present, the research on microgrid is in the ascendant at home and abroad, but there are few studies on the influence of microgrid on distribution network closure, and there is even a lack of quantitative analysis and control methods for distribution network closure including microgrid. Theories, models and methods to guide practice

Images