Integrated Control Method for Suppressing Whole-Process Overvoltage in HPFC Systems Combining Reactive Power Adaptive Regulation with Improved LADRC Strategy
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding 071003 China; 2. State Grid Hebei Electric Power Co Ltd. Economic and Technological Research Institute Shijiazhuang 050000 China
Abstract：Hybrid power flow controller (HPFC) is an advanced power system device that has garnered significant attention for its potential applications in modern power systems, primarily due to its capability to achieve continuous and precise power flow regulation. However, under the fault scenarios, the HPFC may experience overvoltage issues, which pose a threat to the safe operation of the HPFC device and may compromise the stability of the entire power system. To address this critical challenge, this paper proposes a novel control strategy that integrates linear active disturbance rejection control (LADRC) with adaptive reactive power regulation and adaptive bandwidth parameter regulation, aiming to effectively suppress overvoltage throughout the entire process. The study begins with an in-depth analysis of the topology and working principle of the HPFC, focusing on the internal power characteristics of the system and the mechanism of overvoltage generation. By examining the power flow relationships within the HPFC system and the coupling between reactive power and voltage, an adaptive reactive power control (ARPC) strategy is developed. This strategy dynamically regulates reactive power during system faults to effectively mitigate overvoltage. Additionally, to address the potential short-term overvoltage issue at the initial stage of overvoltage suppression, linear active disturbance rejection control (LADRC) is introduced to enhance the dynamic response characteristics of the system. Traditional fixed-bandwidth LADRC, however, has limitations in suppressing overvoltage caused by faults. Therefore, this paper further investigates the relationship between the bandwidth parameter of LADRC and its dynamic response characteristics. An improved LADRC method, termed adaptive LADRC (A-LADRC), is proposed. This method optimizes the bandwidth parameter in real-time based on the difference between the reactive power reference value and the actual output. By dynamically adjusting the controller bandwidth, the proposed method can rapidly suppress overvoltage while maintaining system stability, thereby achieving comprehensive overvoltage suppression. The integration of ARPC and A-LADRC enables coordinated control across all operational stages, from the onset of a fault to its recovery. Finally, based on RT-LAB real-time simulator and actual controller, a controller level hardware-in-the-loop test platform was built to verify the overvoltage suppression strategy under different fault scenarios. The experiment compares and validates the ARPC combined PI control and the proposed A-LADRC strategy. The experimental results show that the inhibition time of ARPC combined with A-LADRC under different working conditions is shorter, which is 0.11 s and 0.12 s, and 0.28 s and 0.3 s under PI control, which is about 50% shorter than that under PI control. In the simulation experiment of fault overvoltage, the short-time overvoltage exists in the initial stage of fault under PI control, which can be effectively avoided by using the proposed A-LADRC. The peak value of overvoltage suppression under PI control is 1.17 and 1.31, and the peak value of overvoltage suppression using the proposed method is 1.09 and 1.02, which shows that the suppression effect is obviously better. The results show that the proposed method can effectively improve the speed of overvoltage suppression, reduce the peak value of overvoltage suppression, and realize the whole process of overvoltage suppression from the control level.
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2026, Vol. 41 
