Application of FGI Static Var Generator in coal mine gas power generation system
1.Application background
Coal bed methane (gas) mining can not only ensure the safe production of coal, the basic energy of the country, but also effectively promote the goal of "carbon peak, carbon neutrality", which is of great significance for promoting the healthy and sustainable development of coal and coal bed methane (gas). 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. Through the gas extraction unit, the gas from the mine is discharged to the surface and delivered to the gas-fired power plant. The electric energy of the gas-fired power plant is usually directly connected to the grid of the mine substation, which can not only reduce the power supply capacity of the substation, but also reduce the loss of the grid, but also save the line investment.
2. Several problems of gas power generation
Because of its small capacity and easy to be affected by load fluctuations, the gas generator set needs to be connected to the power grid to achieve its smooth operation. If it wants to achieve independent operation, it must make its load fluctuation not exceed the allowable limit of the unit. In terms of power quality, there are outstanding problems.
After the installation of gas power generation system, the active power obtained by users from the grid will be reduced, resulting in the reduction of power factors;
When the power load is small, there is the phenomenon of surplus power backflow in the power system, resulting in reverse reactive power, which leads to the increase of power regulation costs, and thus reduces the economic benefits of enterprises.
3.FGI solution
Shandong energy company FGI Company introduced a high voltage dynamic and reactive power compensation Static Var Generator(SVG) which can solve the power quality problem in mine gas power generation system.
FGI Static Var Generator(SVG) is connected to the power grid in parallel, through collecting the voltage and current signal of the system, and calculating the reactive power and power factor of the system, it can be adjusted according to the changes of the system, so as to keep its power factor within the set range. The whole adjustment process is smooth and accurate, and there is no overfill or insufficient phenomenon, which can effectively improve the power factor of the system and prevent electricity fines.
FGI Static Var Generator(SVG) products have a standardized interface, can be connected with the substation integrated automation system, to achieve the equipment operating status and fault information upload, easy to maintain and maintain.
4. Program advantage
FGI Static Var Generator(SVG) has the characteristics of high performance, high reliability, easy operation, good power grid adaptability and environmental adaptability, and can provide personalized solutions such as buck/direct hanging, indoor/outdoor, air cooling/cooling/air cooling for traditional large power users (such as coal mine, petroleum, petrochemical, metallurgy, etc.).
In the case of instantaneous voltage drop, instantaneous rise and large load switching of the power network, it can ensure that the power grid does not jump the network within the scope of the specification.
With the power grid negative sequence imbalance, harmonic governance and other functions.
On the basis of the previous work, FGI will combine the domestic advanced mine energy storage emergency power supply technology, carry out the research and application of the key technologies of emergency power supply and disaster prevention and reduction based on energy storage under high gas mine, promote the development of multi-machine parallel operation control technology and switching control technology under off-grid operation mode, and realize the seamless switching technology application of multiple parallel/off-grid operation modes.
