Micro-Grid, also translated as micro-grid, refers to a small power generation and distribution system composed of distributed power supply, energy storage device, energy conversion device, load, monitoring and protection device. The proposed microgrid aims to realize the flexible and efficient application of distributed power supply, and solve the problem of connecting a large number and various forms of distributed power supply to the grid. The development and extension of microgrid can fully promote the large-scale access of distributed power and renewable energy, and realize the high reliable supply of multiple energy forms of load, which is an effective way to realize the active distribution network, and make the traditional power grid transition to the smart grid.

1. Project overview

FGI's new generation of industrial and commercial energy storage devices have been successfully applied to a microgrid project in Hefei, mainly providing power support for field exploration projects. This project is mainly a field operation, and the power supply company cannot provide temporary lines to ensure power supply, so it is necessary for the owner to form a micro-grid and solve the problems of power load independently. Therefore, the owner configured 1MW distributed photovoltaic power supply, FGI1MW/2MWh industrial and commercial energy storage device, standby diesel generator set, while equipped with charging piles, air conditioning and other flexible loads, to achieve related load and monitoring, energy scheduling management and distribution and other functions, constitute a typical microgrid application system. Based on the load curve of new energy generation, user production load curve and flexible controllable load curve, the energy management and dispatching system of our company uses the energy storage system as a reservoir, which can dynamically dispatch energy and maximize the energy digestion, absorption and power consumption stability of the microgrid.

2.Characteristic of project

Realized the power load protection of the field work project department, completely separated from the power supply of the grid, verified the feasibility of off-grid microgrid, and has a very good demonstration value;

Implements new energy application in the micro grid case to explore, in the case of off-grid work, new energy consumption using can and perfect combination of energy storage system;

Energy storage system can be in low price period (such as night), and in high electricity prices during the discharge (such as the peak period of time during the day), to help users reduce electricity bills, and reduce the power peak load, achieve the balance of power supply and demand.

Energy storage system can stabilize the voltage and frequency, and improve the quality of electric power, quick response to the change of the power grid frequency, to improve the stability of the power system. At the same time, it can also provide reactive power support, improve voltage quality, and ensure the normal operation of equipment. 

During power failure or in energy storage system can provide standby power, sustain a continuous supply of critical load, especially in remote areas or critical infrastructure is particularly important.

Energy storage system can store the intermittent renewable energy sources such as wind power and solar energy to produce electricity, and in the absence of wind or insufficient light power, so as to realize steady output, reduce our dependence on traditional power grid, improve the utilization of renewable energy.

3.Eco-efficiency value

The paper explores the relevant operating conditions of the reliable operation of the microgrid in the off-grid working environment, and verifies the value of the application of the energy storage system in the microgrid.

realized from the power grid applications, has a good demonstration and application value, open the energy storage system for the next step in the application of the micro grid laid a solid foundation.

Energy storage system can continue to provide power in power grid failure, ensure the normal operation of the critical load, to ensure the security and stability of the power supply.

Energy storage system is one of the important technical support for energy transformation, promote the extensive application of renewable energy and energy structure optimization.