摘要
受限于多端直流配电系统运行点的多样性与阻抗环境的复杂性,基于换流站单点配置的有源阻尼控制往往难以提供足够的稳定性提升效果。为满足复杂系统中有源阻尼的多源配置需求,从负载角度出发,以移相全桥直流变换器为例,在建立其平均等效电路、阻抗降阶模型与输入输出侧并联阻抗低频换算关系的基础上,对输入电压前馈有阻尼控制策略进行了溯源,并提出了输出电压反馈有源阻尼控制策略。最后,以双端直流配电系统为应用对象,通过时域仿真、小信号特征值轨迹对比以及对应硬件在环实验,验证了移相全桥直流变换器阻抗降阶模型的准确性与有源阻尼策略的有效性。
In multi-terminal DC distribution system,due to the diversity of operating points and the complexity of impedance environ⁃ment,it is often difficult to provide sufficient improvement effect of stability by the active damping control with single point configuration in the converter station.In order to meet the multi-source configuration requirements of active damping in complex system,this paper takes the phase-shifted full-bridge DC converter as the research object from the perspective of load.On the basis of establishing the average equivalent circuit,the reduced-order impedance model and the transformation relation between input side and output side parallel impedances in low-frequency range,the origin of active damping control strategy using input voltage feedforward is traced,and the active damping control strategy of output voltage feedback is proposed.Finally,the dual-terminal DC distribution system is taken as the application abject,the accuracy of the reduced-order impedance model for the phase-shifted full-bridge DC converter and the effectiveness of the active damping strategy are verified by the time-domain simulation results,the small-signal eigenvalue trajectories and hardware-in-the-loop experiments.
作者
李欢
姜文伟
陈鹏伟
李昊键
LI Huan;JIANG Wenwei;CHEN Pengwei;LI Haojian(State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China;Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《南方电网技术》
CSCD
北大核心
2023年第11期22-32,共11页
Southern Power System Technology
基金
直流输电技术全国重点实验室开放基金项目(SKLHVDC-2021-KF-10)。
关键词
直流配电系统
移相全桥变换器
有源阻尼
降阶阻抗
DC distribution system
phase-shifted full-bridge converter
active damping
reduced-order impedance
