基于瞬时无功理论和平衡变压器的牵引变电所

针对变电所平衡变压器的特点,结合三相瞬时无功检测理论,提出了一种针对平衡变压器的两相电流瞬时无功检测方法?该方法应用于牵引变电所二次侧两供电臂电流的动态综合补偿,使两臂电流达到平衡,以确保一次侧三相系统侧电流对称,同时可以抑制谐波和无功分量?尤其在两供电臂电流对称的情况下,该检测方法和有功分离检测法或FBD检测法相比,只需1 / 4个电源周期,极大加快了响应速度?其次提出了直流侧电压和两变流器电流的控制策略?仿真结果证明了该检测方法的正确性和实时性?

Compensation based on instantaneous reactive current detection theory and balance transformer for traction substation

Based on the characteristics of balance transformer in traction substation and combined with three-phase instantaneous reactive current detection principle,the two-phase instantaneous reactive current detection is proposed for the balance transformer,which is applied in the dynamic compensation of two arm currents at secondary side to balance the arm currents for ensuring the symmetry of primary currents at three-phase side and suppressing the harmonics and reactive components. When two arm currents are symmetric,the detection time is a quarter of power period,much faster than that of the active separation method or FBD method. The DC voltage control and the current control for two inverters are also presented. The simulative results show its correctness and real-time performance.