分析了用于有源补偿器的现有无功及谐波电流检测方法，提出基于同步旋转坐标系下广义瞬时无功功率新理论的广义瞬时无功电流实时检测方法及实现原理。理论分析及仿真结果表明，采用该方法可有效地检出三相广义瞬时无功电流，并可分离出三相瞬时有功电流、基波正序瞬时无功电流和基波不对称及高次谐波瞬时无功电流。 The current reactive power and harmonic current detection methods for active compensator are analyzed and a real-time generalized instantaneous reactive current detection method based on generalized instantaneous reactive power theory under synchronous rotating coordinate system is proposed. Theoretical analysis and simulation results show that this method can effectively detect three-phase generalized instantaneous reactive current, and can separate three-phase instantaneous active current, fundamental positive sequence instantaneous reactive current and fundamental wave asymmetry and higher harmonic Instantaneous reactive current wave.