As the field for electricity from the original gateway metering into a single well (point) measurement, so the single well (point) power factor can not be achieved. In 2003, Linpan oil production plant to pay only 1.5 million yuan more power factor adjustment. To this end, taken a variety of measures to improve the power factor, reached the purpose of saving energy and reducing consumption. First, the impact of permanent magnet synchronous motor power factor The permanent magnet synchronous motor used in the pumping unit is an asynchronous start synchronous motor, driven by rotor AC synchronous pull into operation, similar to the AC synchronous motor. Its operation is based on the stator coil in the air gap generated by the rotating magnetic field and magnet on the rotor mutual attraction, the rotor and stator air gap magnetic field synchronous rotation work. The rotor is equivalent to the resistance circuit, so the high power factor. Because of no excitation current, its no-load loss is small. Motor efficiency up to 96%, higher than the three-phase asynchronous motor. The factors that affect PMSM power factor are voltage quality (voltage magnitude) and load factor. When the grid voltage is higher than the back electromotive force point of the motor, the permanent magnet motor operates in inductive load; on the contrary, the motor is in capacitive load operation. Therefore, the grid voltage fluctuations will cause the motor power factor fluctuations, compensation difficulties. If the voltage amplitude and motor back EMF point close to ± 2% deviation within the voltage range, the motor power factor greater than or equal to 0.9, otherwise, the power factor is low; In addition, when the permanent magnet synchronous motor load is less than 25% Motor power factor is also low. Second, improve the permanent magnet motor power factor method Through the single well point power factor analysis of low, respectively, to take the following methods to be adjusted. 1 according to the actual load rate of the appropriate exchange motor, in order to ensure the appropriate load rate. 2. Stabilize system voltage, especially overloaded line ends, generally low voltage. 3. Stabilize the single-well voltage close to the no-load back EMF of the permanent magnet synchronous motor. 4. When the operating voltage is higher than the permanent magnet motor back EMF point, according to the size of the inductive reactive power, plus capacitor compensation to improve the power factor. 5. When the operating voltage is lower than the permanent magnet motor back EMF point, the transformer tap changers can be adjusted to properly increase the secondary voltage amplitude, so that the motor operating voltage near the back-EMF point to improve the power factor. 6. For heavy load long lines, adjust the transformer tap, the transformer secondary voltage amplitude is still lower than the permanent magnet motor back EMF point, you can replace the permanent magnet synchronous motor, the use of capacitor compensation. Third, the adjustment of the situation and effect analysis Through the adjustment test of some wells in the sixth generation of production, so that the power factor of non-compliance of the basic standards. First of all, the substation and line capacitance have been adjusted so that the terminal voltage has increased. Secondly, according to the test results of single well, the corresponding countermeasures are taken, some increase the capacitance, and some adjust the transformer gear, adjust the motor power for some wells. Test results show that the use of permanent magnet synchronous motor well in addition to one of the power factor, all the other qualified, power factor adjustment electricity dropped significantly. After the success of the six oil production team, the solution has now been applied throughout the plant. At present, Linpan oil production plant power factor adjustment of electricity from 500,000 yuan in early 2004 dropped to 50,000 yuan, and achieved good results.
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