Wind and light complement distributed micro-grid system for comprehensively utilizing commercial power

Abstract

The invention provides a wind and light complementing distributed micro-grid system for comprehensively utilizing commercial power. The system comprises a distributed wind-light energy micro-system, a user load, a bidirectional power meter, an alternating-current bus, a high / low-voltage transformer, a power grid, a superior scheduling management system, a micrometeorological interaction device, a clock interaction device and a switch, wherein the distributed wind-light energy micro-system and the user load are connected to the alternating-current bus through the bidirectional power meter, and access the conventional power grid through the high / low-voltage transformer; the switch refers to an isolating switch and a circuit breaker; and the superior scheduling management system is used for detecting the state of the wind-light energy micro-system, deciding the power generation / power supply state of the wind-light energy micro-system according to the states of the micrometeorological micro-prediction interaction device, the clock interaction device, an energy storage device and the user load, and deciding the interaction state of the wind-light energy micro-system and the power grid. According to the system, power can be independently supplied to the user load, grid-connected power generation with the power grid can be performed according to the processing result of urban micrometeorological interaction information, time-of-use power price is supported simultaneously, the power supply demand of a user is met, the cost is lowered, the power generation benefit is increased, the power utilization cost is lowered, and the reliability of the power grid is enhanced.

Description

technical field [0001] The invention relates to the field of wind energy and light energy new energy power generation and application, and to the technical field of distributed power generation and control. In particular, it relates to a distributed micro-grid system that utilizes wind energy and light energy to complement each other and comprehensively utilize mains power. The invention is applicable to a micro-grid system composed of solar energy and wind energy on the roof of a residential area, and is also applicable to an intelligent power consumption residential area system such as an urban community and a remote area. Background technique [0002] On the one hand, due to the rapid growth of power load in the conventional power supply mode widely used at present, it is necessary to build an ultra-high voltage extra-large power system with a large-capacity generator set as the main power source to ensure the reliability and stability of power supply. The inherent disad...

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Problems solved by technology

[0005] (1) The characteristics of distributed power sources determine that the output of some power sources will change with changes in external conditions, showing intermittent and random characteristics, making it difficult for these power sources to meet the power balance of the load only relying on their own adjustment capabilities. And it cannot be dispatched, and needs the cooperation of other power sources or energy storage devices to provide support and backup

[0006] (2) The grid-connected operation of distributed power generation changes the power flow distribution in the system. For the distribution network, due to the access of distributed power generation, there is a bidirectional power flow in the system, which brings great challenges to voltage regulation, protection coordination and energy optimization. new question

At present, some distributed power sources automatically exit operation when a fault occurs on the system side, which exacerbates the transient power imbalance of the system, which is not conducive to the security and stability of the system

[0007] (3) It needs to be integrated into the power grid through the power electronic interface. The introduction of a large number of power electronic equipment and capacitors and inductors can easily affect the quality of power supply for surrounding users. External interference may cause the frequency and voltage to be out of sync, thus dragging down the entire system

[0008] (4) A large number of distributed power sources in various forms and unschedulable will bring greater difficulties to system operators who rely on traditional centralized power dispatching methods for management. Lack of effective management will lead to failures in the operation of distributed power sources. "Arbitrariness" poses hidden dangers to the security and stability of the system

At present, there is no patent application in this field in China

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