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In order to solve the electric capacity of oil field reactive power compensation device, based on the existing problems of reactive power compensation device, a compensation scheme combining thyristor switching capacitor and static var generator is proposed in this paper. And the SOGI-FLL algorithm is applied to the exact calculation of the voltage precision lock-in and reactive power. The outcome are used to determine the capacitor input time of the Matlab simulation model of thyristor switching capacitor and to provide the control reference signal of the static var generator, So as to realize effective control of harmonic and reactive current. The simulation results show that the scheme not only realizes the reactive power compensation effectively, but also reduces the reactive power loss of oil field distribution network and improves the power factor.