Method and device for detecting unbalanced current

The invention relates to the technical field of current detection, in particular to an unbalanced current detection method and device. When the unbalanced current is detected, the neutral point of the SVG device is transferred by injecting the zero-sequence voltage component into the SVG device, so that the regenerated voltage vector is vertical to the current vector, and the detection of the three-phase unbalanced current is realized; and the condition that the compensation fails when the SVG device compensates the unbalanced current under special conditions is avoided. 本发明涉及电流检测技术领域，尤其是涉及不平衡电流的检测方法及装置；本发明在不平衡电流检测时，通过在SVG装置中注入零序电压分量的方式，使得SVG装置的中性点转移，进而使重新产生的电压向量与电流向量垂直，以实现三相不平衡电流的检测；避免了特殊情况下SVG装置对不平衡电流补偿时补偿失败的情况。