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| Topology and Control Strategy of New Electromagnetic Hybrid Power Flow Controller |
| Jia Jiaoxin1, Li Haomai1, Shao Chen2, Yang Shifang3, Yan Xiangwu1, Zhang Bo1 |
1. Hebei Provincial Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding 071003 China;
2. College of Mechanical and Electrical Engineering Hebei Agricultural University Baoding 071001 China;
3. Department of Electrical Engineering North China Electric Power University Baoding 071003 China |
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Abstract With the high proportion of distributed energy access and the development of power supply systems at both ends, some medium and high voltage distribution networks have uneven power flow distribution and feeder overload. Aiming at the problem that the power flow of medium and high voltage distribution networks is difficult to accurately control, this paper proposes a solution using electromagnetic hybrid power flow controller (EHPFC), which has the advantages of strong applicability, low cost and high reliability.
Firstly, the topology and working principle of ‘Sen’ transformer (ST) are analyzed. ST is an electromagnetic power flow controller based on on-load tap changer, which can control the line power discretely. In order to make it have more flexible power flow control ability, this paper proposes a hybrid power flow controller (EHPFC) topology based on large capacity ST and small capacity RPFC. Furthermore, the topology and working principle of the RPFC are analyzed. The RPFC is composed of two rotor phase shift transformers RPST1 and RPST2. Based on the principle of electromagnetic induction, the rotor angle rotation of the two RPSTs is used to synthesize a stator voltage phasor with constant amplitude and adjustable phase angle 360°. The two stator voltage phasors are superimposed, and a series voltage with adjustable amplitude and phase angle is injected into the line. After the two sets of RPST rotor windings are connected in series, one end is connected to the ST and the other end is connected to the line. At this time, the voltage of the ST and RPFC in the line is the compensation voltage of the system.
Secondly, the capacity coordination relationship between ST and RPFC is derived. Based on the equivalent voltage source model of ST and RPFC, the steady-state voltage source model of EHPFC is further established. Then, the EHPFC power decoupling model based on instantaneous reactive power theory is constructed. The two-stage control strategy of EHPFC is studied, including the tap control of ST and the double rotor angle control method of RPFC. In order to ensure the error-free control of the overall control system of EHPFC, a double closed-loop PI control strategy is selected in RPFC control, and URPFCref is used as the outer loop control target value. At the same time, the two sets of rotation transfer phase transformer angles α1ref and α2ref are taken as the target of inner loop control, and the actual values of α1 and α2 are output through a speed limit module. Finally, the EHPFC achieves accurate control of line power flow by collaboratively controlling the ST gear and the RPFC rotor angle.
Finally, a simulation model based on 35 kV distribution system is built in Matlab/Simulink, and its control effect is verified under power decoupling and power balance conditions. The influence of line parameters on EHPFC power decoupling is studied. The simulation results show that compared with the single adjustment of ST, the access of EHPFC can effectively improve the accuracy of line power flow control, and the adjustment error is less than 3%, which verifies the feasibility and effectiveness of the proposed topology and control strategy.
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Received: 30 August 2024
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2025, Vol. 40 
