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MMC-MG grid-connected micro-source power coordinated optimization method based on adaptive genetic algorithm

A genetic algorithm and coordinated optimization technology, applied in the field of micro-source power coordinated optimization control, can solve the problems of low micro-source utilization rate and inconsistent switching time of power generation modules, and achieve the effect of improving utilization rate

Pending Publication Date: 2022-06-03
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the grid-connected operation mode of this system, when the carrier cascading modulation (Phase disposition SPWM, PD-SPWM) method is adopted, the switching time of the power generation module in the bridge arm is inconsistent, which will reduce the utilization rate of the micro-source

Method used

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  • MMC-MG grid-connected micro-source power coordinated optimization method based on adaptive genetic algorithm
  • MMC-MG grid-connected micro-source power coordinated optimization method based on adaptive genetic algorithm
  • MMC-MG grid-connected micro-source power coordinated optimization method based on adaptive genetic algorithm

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Embodiment Construction

[0007] figure 1 It is a structural topology diagram of the bridge arm N micro-source MMC-MG according to an embodiment of the present invention. A phase (including A-phase upper arm, A-phase lower arm), B-phase (including B-phase upper arm, B-phase lower arm), C-phase (including C-phase upper arm, C-phase lower arm) ), filters, loads, static switches, etc. The three-phase subsystems in this system are symmetrical. like figure 2 As shown, in each bridge arm, the power generation module GM is connected in parallel to the DC side of the micro-source half-bridge converter from the wind micro-source and the photovoltaic micro-source through the AC / DC rectifier circuit or the DC / DC DC conversion circuit respectively.

[0008] In order to improve the utilization rate of renewable energy, the present invention provides an MMC-MG grid-connected micro-source power coordination optimization method based on an adaptive genetic algorithm. The method takes the total number of power gen...

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Abstract

The invention discloses an MMC-MG grid-connected micro-source power coordinated optimization method based on an adaptive genetic algorithm. The method takes the total number of power generation modules needing to be input into each phase, output current and micro-source power as constraint conditions. The maximum output power of the micro-source is used as a main factor for constructing a fitness function. And in combination with the mean value of N fitness functions in the bridge arm and the variable quantity of the switching quantity of the power generation module, switching or replacing operation is performed on the power generation module according to the principle that the smaller the fitness function is, the more the number of times of input is, and the larger the fitness function is, the less the number of times of input is. According to the method, the power coordination optimization control of the micro-source is realized, the utilization rate of the micro-source is improved, and the stable operation of the system is not influenced.

Description

technical field [0001] The invention relates to a micro-grid control technology, in particular to a micro-source power coordinated optimal control method under the grid-connected operation mode of an MMC half-bridge series-structured microgrid (Modular Multilevel Converter Microgrids, MMC-MG). Background technique [0002] In the context of increasing energy demand, microgrid technology has become an important means to solve problems such as environmental pollution, energy shortage, and the centralized grid connection of a large number of distributed generation units. The grid-connected microgrid needs to use a reasonable generation module (GM) switching optimization strategy to improve the utilization rate of the micro-source, so as to provide as much energy to the grid and load as possible, and to realize the power of the micro-grid and the grid at the same time. balance. Most of the existing power coordination control methods are based on the carrier phase-shift modulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46G06N3/12G06Q10/04G06Q50/06
CPCH02J3/46H02J3/466H02J3/472H02J3/381G06N3/126G06Q10/04G06Q50/06H02J2203/10H02J2203/20H02J2300/24H02J2300/28H02J2300/40Y02E10/56
Inventor 王兴贵王海亮薛晟郭永吉郭群杨维满李晓英王琢玲
Owner LANZHOU UNIVERSITY OF TECHNOLOGY