CAJ | 학술논문

控制系统对于柔性直流输电系统的运行性能起着至关重要的作用，因此对控制策略的研究有着重要的意义。推导了基于两相静止坐标系的模块化多电平换流器高压直流输电(modular multilevel converter-high voltage direct current transmission，MMC-HVDC)系统的数学模型，再结合比例谐振(proportional resonant，PR)控制器的特性，提出了基于两相静止坐标系的 MMC-HVDC 系统稳态控制策略。该策略避免了两相旋转坐标系中的电流交叉耦合项，不需要前馈解耦，整个控制系统更加简单。在电磁暂态仿真软件PSCAD/EMTDC中对上述控制策略进行仿真研究，仿真结果验证了所提策略的正确性与有效性。
공제계통대우유성직류수전계통적운행성능기착지관중요적작용，인차대공제책략적연구유착중요적의의。추도료기우량상정지좌표계적모괴화다전평환류기고압직류수전(modular multilevel converter-high voltage direct current transmission，MMC-HVDC)계통적수학모형，재결합비례해진(proportional resonant，PR)공제기적특성，제출료기우량상정지좌표계적 MMC-HVDC 계통은태공제책략。해책략피면료량상선전좌표계중적전류교차우합항，불수요전궤해우，정개공제계통경가간단。재전자잠태방진연건PSCAD/EMTDC중대상술공제책략진행방진연구，방진결과험증료소제책략적정학성여유효성。
Control system plays crucial role in the operation of flexible high voltage direct current transmission system, so it is significant to research its control strategy. A two-phase stationary reference frame-based mathematical model of modular multilevel converter-high voltage direct current (MMC-HVDC) transmission system is deduced, and combining with the characteristics of proportional resonant (PR) controller a steady-state control strategy for two-phase stationary reference frame-based MMC-HVDC transmission system is proposed. In the proposed control strategy the cross-coupled term of current in two-phase stationary reference frame is avoided, thus the feed-forward decoupling is not needed and it makes the whole control system simpler. The proposed control strategy is simulated in the environment of PSCAD/ EMTDC and simulation results show that the proposed control strategy is correct and effective.