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

A distributed and micro-system technology, applied in solar energy new energy power generation and application, distributed power generation and control, and wind energy fields, can solve problems such as unfavorable system security and stability, system transient power imbalance, and non-dispatchability , to achieve simple plug-and-play use, reduce electricity costs, and improve power generation efficiency

Inactive Publication Date: 2012-02-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1. An implementation diagram of an intelligent micro-grid system using rooftop solar energy systems and small wind generators as various distributed power sources. There are two main types of distributed power sources: one uses solar energy (mainly uses the roof solar energy of each building in the community, the typical power is 3.2KW, composed of solar panels 200W×16) as the energy source, and the other uses small fans as the energy source , which is characterized in that the DC bus power is provided by solar energy and energy storage devices or wind turbines and energy storage devices, so that the control complexity of the controller is reduced. Compared with the system where the DC bus power is provided by various distributed power sources and energy storage devices, And it contains both DC bus and AC bus, such as image 3 shown.

[0035] The hardware connection is to place solar panels and fans on the roof of each building in the community. The distribu...

Embodiment 2

[0046] Embodiment 2, another implementation diagram of an intelligent micro-grid system including an energy storage device. Its distributed power supply is mainly composed of wind energy, solar energy and other energy sources. The energy storage device is a lead-acid battery or a lithium battery discarded by an electric vehicle. The control complexity of the controller increases, but the cost is relatively low, such as Figure 4 shown.

[0047] The hardware connection is to place solar panels and fans on the roof of each building in the community. The distributed energy generation device, energy storage device, and bidirectional DC / DC module control the energy storage device on each building in the entire community. The AC power of the fan is provided by the rectifier For direct current, the distributed solar energy and wind energy of each building are concentrated through the DC junction box, and connected to the user load through the bidirectional grid-connected inverter. ...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/38
CPCY02E70/30
Inventor 陈宗海王智灵陈永环
Owner UNIV OF SCI & TECH OF CHINA
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