A Novel Method for Calculating the Three-phase Unbalanced Shunt Compensation Current in the Low Voltage Distribution Network

In order to compensate unbalanced and non-linear loads of the low-voltage distribution network into the symmetric and pure resistive loads, a novel method is proposed, where the compensation current calculation is performed based on the instantaneous voltage space vector orientation. The proposed method is capable of making the waveform and phase of the compensated current consistent with those of the grid voltage, so as to achieve the minimum instantaneous reactive power consumption under the asymmetric and distorted background of the grid. It is found that this method has considerable advantages, including the low computational expense, adaptive phase sequence and the automatic frequency following, over the conventional methods. The accuracy and effectiveness of the proposed method are verified through simulation and experiments. It is concluded that the proposed method is an accurate and effective method for shunt comprehensive compensation in the low voltage distribution network.