Micro-grid system

Abstract

The invention discloses a micro-grid system, and relates to a power grid technology, in particular to a micro-grid system. A micro-grid low-voltage power supply bus is connected in parallel through agrid-connected inverter, boosted to 10KV through a power supply transformer, and connected in a state grid. The microgrid system not only can realize stable power supply in the grid, but also can be stably butted with a large power grid system. The system comprises a photovoltaic power generation system, a diesel generator system and a battery energy storage system, wherein the photovoltaic powergeneration system and the diesel generator system are used as distributed power supplies; the whole microgrid system is divided into six modules. The system comprises a reference power supply module,a photovoltaic power generation and grid-connected control module, a diesel generator and an intelligent control system module thereof, an energy storage system and an intelligent management module thereof, a load intelligent management module and a system grid-connected module. As a complete power system, functions of power balance control, system operation optimization, fault detection and protection, electric energy quality management and the like are realized by means of self-control and management energy supply.

Description

technical field [0001] The invention relates to a grid technology, in particular to a micro grid system. Background technique [0002] Power balance is the basis for the stable operation of the power system. Once the power is seriously unbalanced due to a fault, the system may lose stability and cause a large-scale power outage, which will cause major economic losses and serious social impact. In order to solve this problem, the traditional method It uses relay protection and safety and stability control devices to perform operations such as machine cut-off, load cut-off, or system de-loading when the system fails, so as to alleviate the power imbalance problem caused by the fault in the system as much as possible. This kind of stability control measure is called Passive stabilization, if there is such a device, it can feel the unbalanced power of the system in real time online, and directly compensate and adjust it, so as to solve the problem of power system stability cause...

AI Technical Summary

Problems solved by technology

Studies have shown that the superconducting magnetic energy storage technology SMES is very suitable for power system stability control, but SMES is expensive, device design, operation and maintenance are very different from the existing various radiation equipment in the power system, and its long-term Safe and stable operation is being explored, and supercapacitor energy storage technology has not yet reached the experimental stage due to the cost of counterfeiting and low energy storage density of a single capacitor

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