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| The Co-Phase Traction Power Supply System Based on Parallel Rotary Negative Compensator |
| Yan Xiangwu1, Li Bingzhen2, Yi Xingping1, Zhen Tianze1, Yu Jiahao1, Sheng Hanzhu1, Jia Jiaoxin1 |
1. Hebei Provincial Key Laboratory of Distributed Energy Storage and Micro-Grid North China Electric Power University Baoding 071003 China;
2. State Grid Taizhou Electric Power Supply Company Taizhou 318000 China |
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Abstract Single-phase industrial frequency AC power supply is widely used in China's electrified railways. Negative sequence currents from electric locomotives and phase separation from phase rotation threaten the safe operation for traction power supply systems. Co-phase power supply technology can address these issues. However, most solutions are based on power electronic converters, with few studies on electromagnetic compensators for co-phase power supply. A parallel rotary negative compensator (PRNC) based on two sets of rotary phase shifting transformers (RPSTs) can output voltages with continuously adjustable amplitude and phase, offering significant cost advantages per unit capacity and showing promise for addressing negative sequence and co-phase power supply challenges in electrified railways.
The PRNC mainly consists of two RPSTs, with rotor windings connected in positive sequence and stator windings connected in negative sequence. By driving the rotor winding with a servomotor, the phase difference between the stator and rotor voltages can be adjusted. The stator voltages of the two RPSTs synthesize a series negative sequence voltage with continuously adjustable amplitude and phase, thereby adjusting the negative sequence compensation current injected by the PRNC into the line.
First, the relationship between the phase shifting angles of the two RPSTs and the negative sequence compensation current was derived based on the PRNC topology. Next, a traction substation system with co-phase power supply and a dedicated high voltage transmission line was proposed, using a single-phase transformer with a center tap on the secondary side as the traction transformer, along with centralized compensation by the PRNC at the point of common coupling (PCC). Then, two dq transformations were used to extract positive and negative sequence components of electrical quantities, calculate the set values of the two RPSTs, and control the RPSTs to reach corresponding mechanical positions to compensate for load negative sequence currents. Additionally, the PRNC equipment was designed by calculating the per phase currents of the stator and rotor windings, thereby determining the stator side capacitance and device capacity. Finally, the effectiveness of the proposed topology and control strategy was verified through simulation and experimentation. The results showed that the PRNC can significantly reduce three phase voltage unbalance on the grid side under both constant and fluctuating load conditions in a co-phase traction power supply system.
The main contributions and conclusions are as follows: (1) The PRNC uses two RPSTs with rotor windings connected in positive sequence and stator windings connected in negative sequence. By adjusting the phase shifting angles, it enables continuous regulation of grid side negative sequence currents. (2) The stator side capacitance is determined based on the relationship between the compensation current provided by the PRNC and the phase shifting angle. The PRNC capacity is determined based on the maximum power of the electric locomotive. (3) The co-phase traction power supply scheme for electrified railways based on the PRNC and single-phase transformers can eliminate phase rotation and reduce three phase voltage unbalance at the PCC, offering a new solution for co-phase traction power supply systems. Future work will focus on optimizing the PRNC prototype parameters to improve its response speed and better address the time varying and impulsive nature of electrified railway loads. It is expected that these improvements will further enhance the reliability and efficiency of the co-phase power supply system in practical applications.
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Received: 23 January 2025
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2026, Vol. 41 
