Electromagnetic hybrid compensation method of three-phase unbalance for high-speed railway traction supply system

For power quality in V/V traction system of the high-speed railway, a kind of electromagnetic hybrid compensation system (EHCS) is proposed. The EHCS is constituted by small-capacity railway static power conditioner (RPC) and high-capacity magnetic static var compensation (MSVC). By utilizing the transient power transfer capability of RPC reasonably, EHSC overcomes the problem of high installation capacity in the traditional SVC compensation system. Because RPC is completely autonomous and disconnected from MSVC, the reliability of EHCS is improved. Under the premise of meeting corresponding standard requirement of power quality, the mathematical model for hybrid compensation method is proposed and further optimized to make the compensating capacity of MSVC smaller. The simulation and experimental results verify that hybrid optimized compensation method can limit the negative-sequence current and power factor within the desired bounds efficiently.