1.Application background

The development and utilization of coal bed methane (gas) not only ensures the safe production of China's basic energy coal, but also effectively promotes the realization of the goal of "carbon peak and carbon neutrality", and plays a positive role in promoting the healthy and sustainable development of coal and coal bed methane (gas) resources. Mine gas power generation technology is suitable for coal mines with a pure gas extraction volume of 1 million cubic meters/year and a gas concentration of 6%-25% in the gas extraction system. The underground gas is discharged to the ground by the gas extraction equipment and transported to the gas power station. The electricity emitted by the gas power station is generally connected to the power supply system of the mine substation nearby. On the one hand, it can be used by itself to reduce the electricity received by the mine substation from the area, reduce the line loss, and save the line investment on the other hand.

2.Problems of gas power generation

Since the gas generator set has a small capacity and is greatly affected by load fluctuations, it must be connected to the system to operate stably. If the gas power station is required to operate in isolation, it is necessary to ensure that the load fluctuation carried by the gas power station is within the permissible range of the generator set. The power quality problem is prominent.

After the installation of gas power generation system, the user takes less active power from the grid, resulting in low power factor;

When the power load is small, there will be surplus power back to the grid, reverse reactive power, resulting in force adjustment of electricity costs, affecting the efficiency of enterprises.

3.FGI solution

The high voltage dynamic reactive power compensation SVG device produced by FGI, a subsidiary of Shandong Energy Group, can perfectly solve the power quality problem of coal mine gas power generation system.

The FGI Static Var Generator(SVG) device is connected in parallel to the power grid, collects the system voltage and current signals, calculates the reactive power and power factor of the system, and automatically adjusts the output according to the changes of the system, so that the power factor is stable within the set range. The whole adjustment process is smooth and accurate, and there will be no overfill or underfill, which can effectively improve the system power factor and avoid the electricity penalty.

FGI Static Var Generator(SVG) products have standardized interfaces, can be connected with the integrated automation system of the station, upload the equipment running status and fault information, operation and maintenance is more convenient.

4.Program advantage

FGI Static Var Generator(SVG) has high performance, high reliability, easy operation, excellent grid applicability and environmental adaptability, and can provide a variety of personalized solutions such as buck/direct hanging, indoor/outdoor, air cooling/water cooling/air cooling for traditional large power enterprises such as mining, petroleum, petrochemical, metallurgy and so on.

When the power grid voltage falls instantaneously, rises instantaneously, and the plant power network switches large loads, it can ensure that it does not run off the network within the range of standard requirements.

It has the function of negative sequence unbalance compensation and harmonic control. 

In the next step, FGI will focus on the use of mature and internationally leading energy storage emergency power supply technology in coal mines, and carry out research and application of key technologies for emergency power supply and disaster resistance improvement of distribution network based on energy storage system with high-gas mining areas, and increase the promotion of multi-machine parallel networking operation control technology and switching control technology in the off-grid mode of new energy storage system. The application of seamless switching technology under different operating modes in parallel/off-grid.

Adhering to the service concept of "service everywhere, customer always first", FGI provides customers with first-class power electronic equipment and services to help customers use and maintain safely, reliably and efficiently, and has been fully reflected in the application of gas power generation and power supply systems. In the future, FGI will continue to increase technological innovation, constantly promote product upgrades, and lead the development of the industry. To help the green, low-carbon and high-quality development of industry.