Harmonic Suppression in the Power System of Electric Drilling Rig

The paper presents a hybrid power filter for suppressing harmonics caused by the nonlinear load in drilling rig electric power system, and analyzes the impact and the harm of the harmonic. The principle and the control method of system are discussed. A composite control model is adopted. The experimental results show that the hybrid power filter has the good characters of harmonics elimination and reactive power compensation, can raised the power factor effectively, decreased the harmonic current and improved the current waveshape. It has proved the system safety and steady, and has good cost performance with deserving extensive use.