Recently, FGI Science And Technology Co., LTD., "to solve the problem of long-distance power supply of mining face power grid comprehensive regulation system project development" passed the scientific and technological achievements appraisal of Shandong Coal Society, and was highly recognized by the appraisal committee.
Shandong Coal Society organized relevant experts to set up a scientific and technological achievements appraisal committee, with Xu Junxiang, professor senior engineer of Shandong Electric Power Engineering Consulting Institute, as the chairman of the appraisal committee, by the relevant experts of various units of the committee, reaching the domestic leading level, which can provide reference for 5000 domestic coal mining enterprises. The successful acceptance of the power grid comprehensive regulation system means that the technical scheme can be widely used in the domestic and foreign coal mine underground driving face and even the coal face where remote power supply is needed, so as to improve the inefficient means of the current driving production process, and has a broad market application scenario.
The project of "Development of Power grid Comprehensive regulation System to solve the problem of long-distance power supply of mining face" aims to solve the problem of long-distance power supply of mining face, solve the problem of long-distance line voltage drop without using parallel cables, mobile transformers and other measures, and realize long-distance power supply of 1000-3000 meters of mining face.
The program mainly includes the following aspects of innovation:
(1)There are many control modes for reactive power compensation of long-distance power supply integrated treatment device, including constant device reactive power mode and constant test point reactive power mode. It can improve the power factor of the working face to 0.99 from the system level, filter out the harmonics of the grid, improve the transmission and power supply capacity of the power supply line, and save energy and reduce consumption.
(2) Developed a compound control strategy design combining load voltage feedback control with phase compensation and load line voltage drop feedforward control, which can greatly improve the response speed of voltage compensation under the premise of ensuring the stable accuracy of the power supply end voltage, and the dynamic response time is not more than 20 ms.
(3) Research line impedance voltage drop adaptive algorithm, which can perform line impedance voltage drop adaptive calculation according to line diameter specifications, line length and load current, can improve the adaptability of the device to different application sites, and ensure that the voltage compensation of downhole equipment when starting up to 97% of the rated power grid voltage. The grid voltage value can be compensated to 99% of the rated grid voltage during full load operation.
Technological innovation is the source for enterprises to form core competitive ability and maintain competitive advantage. The integrated power grid regulation system developed by FGI to solve the problem of long-distance power supply at the mining face will completely solve the phenomenon of significant voltage reduction caused by the operation or start-up of the equipment in the driving face, and avoid various problems caused by the failure of equipment start-up or unstable operation due to the voltage reduction. It realizes the direct start and stable operation of the driving motor on the 1.2kV power supply line above 2500m. It not only helps to improve coal production efficiency, reduce production costs and improve the reliability of power supply, but also improves the traditional coal mining production process, effectively reduces the labor intensity of miners, reduces the number of underground workers, and greatly improves work safety.
FGI will keep in mind the mission of "mastering the core technology and continuously promoting the industry of power electronic equipment iot", and continuously improve the technical level of the power grid integrated regulation system to solve the problem of long-distance power supply at the mining face, and provide customers with more reliable and efficient "explosion-proof electricity" solutions.
