Low-Frequency Pulse Power Active Suppression Method Based on Voltage Compensation for Airborne Pulse Loads
Zhang Zuoqian1, Yang Fan2, Jin Xin1,3, Xing Yan1, Wu Hongfei1
1. Center for More Electric Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing 210016 China; 2. College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China; 3. Aviation Industry Corporation of China Leihua Electronic Technology Research Institute Wuxi 214125 China
Abstract：The high peak-to-average ratio of low-frequency pulse power loads seriously affects the safe and stable operation of airborne power supply systems. The conventional approach requires stacking numerous energy storage capacitors due to the DC bus voltage ripple limitation, which substantially increases the system’s volume. Although current active pulse power suppression method can reduce the required capacitance by increasing voltage fluctuations, the considerable power ratings and additional power processing stages of active suppression circuits impact system efficiency significantly. This paper presents a low-frequency pulse power active suppression method based on voltage compensation. The active suppression circuit is inserted between the DC bus and the energy storage capacitor Cd. By compensating for the voltage difference between Cd and DC bus with the output voltage vs of the active suppression circuit, the voltage range of Cd is not constrained by the DC bus, allowing for a reduction in Cd. Since the active suppression circuit only compensates for capacitor voltage fluctuations, its power rating and losses are much smaller than the average power of pulse loads, which greatly reduces the volume, weight, and losses. The active suppression circuit takes power from the DC bus. Considering that its input and output terminals are non-common ground and have a wide output voltage range, the LLC-DC transformer (DCX) cascaded Buck converter is chosen for the active suppression circuit. The LLC-DCX functions operate in an open loop as a high- frequency DC transformer, and a dual-loop control strategy is implemented for the Buck converter. The outer voltage loop adjusts the voltage fluctuation range of Cd, while the inner current loop suppresses the input current ripple. The design guidelines for key parameters are also presented, with size and efficiency as the main considerations. The size of the power supply is influenced by Cd, while the power rating of the active suppression circuit affects system efficiency. Therefore, a detailed study of both aspects is conducted. The results reveal that once the load is determined, Cd decreases as the voltage fluctuation Δvd increases, and the decreasing rate gradually slows. Additionally, the power rating of the active suppression circuit increases linearly with the average voltage Vdav and Δvd. The lower limit of Vdav is also affected by Δvd to ensure that the output voltage of the Buck converter remains positive. Therefore, a balance must be achieved between Vdav and Δvd to optimize capacitance and power rating. An experimental prototype is constructed. The experimental results are consistent with the theoretical analysis, and the active suppression circuit effectively regulates the voltage fluctuation range of Cd and suppresses the input current. Efficiency tests reveal that the active suppression scheme maintains an efficiency above 98.1% throughout the entire range, with a peak efficiency reaching 99.1%. This scheme is compared with existing active suppression schemes, showing clear advantages. In addition, results from various literature are normalized and compared.
张佐乾, 杨帆, 金鑫, 邢岩, 吴红飞. 面向机载脉冲负载的电压补偿型低频脉冲功率主动平抑方法[J]. 电工技术学报, 2025, 40(10): 3251-3259.
Zhang Zuoqian, Yang Fan, Jin Xin, Xing Yan, Wu Hongfei. Low-Frequency Pulse Power Active Suppression Method Based on Voltage Compensation for Airborne Pulse Loads. Transactions of China Electrotechnical Society, 2025, 40(10): 3251-3259.
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