Adopt MVD synchronous switching between power frequency and variable frequency, realizing bumpless switch, realizing soft start of multi-motor in sequence, and adjust speed of one motor, reaches the control target, and it has better energy efficiency, one-drive-more also reduce much equipment cost.
The water injection in the mining technology of an oil field of Jiangsu Province, Sinopecis driven by a 6KV / 630KW motor, the water injection rate in each block of the oil field needs to be adjusted according to the mining conditions, the company uses a return valve to control the flow, which has caused serious energy waste and brought other problems, such as serious equipment wear and tear, low control accuracy.
A petrochemical company in Shandong is one of China's top 500 enterprises based on the oil refining, the circulating gas compressor of the enterprise propylene production workshop is driven by a 6kV / 450kW motor, the scene compressor belongs to heavy load start, and the start is very difficult, there are still large noise, large start current, pressure mutation and other issues. In addition, due to the greater volatility of load, the pressure adjusting only relies on the valve opening, causing serious energy waste.
The 1st oil production factory of Daqing oil field is the largest oil production plant in China and the first oil production plant to achieve the cumulative production of 500 million tons crude oil, an oil depot of the oil production plant is configured with two sets 6kV / 315kW and two sets 6kV / 280kW oil pumps with dual pump parallel operation, the valve opening does not exceed 30%, which are the most important energy-consuming equipment in the oil tank production and operation.