基于PCI控制的MMC-HVDC系统稳态控制策略研究

摘要

模块化多电平柔性直流输电系统MMC-HVDC常规采用比例积分双闭环控制,在两相旋转坐标系下存在电流耦合项需要加入前馈解耦控制,为了简化控制器,采用比例复数积分PCI控制在两相静止坐标系下对电流内环进行设计.将PCI内环与功率外环结合,提出基于PCI控制的稳态控制策略.通过电磁暂态仿真软件PSCAD/EMTDC对上述控制策略进行仿真研究.仿真结果表明,所设计控制器稳态跟踪性能好,且外环功率控制相互影响更小,控制策略是有效的.%The MMC-HVDC(modular multilevel converter-high voltage direct current)system usually adopts double closed-loop control based on PI controller,but in the two-phase rotating reference frame,there is cross-coupled term of current that needs to join the feedforward decoupling control.In order to make the whole control system simpler, PCI(proportional complex integral)control is needed to design the inner loop in two-phases stationary reference frame,then a steady-state control strategy based on PCI inner-cycle and power outer-cycle was built.The above control strategy was simulated by electromagnetic transient simulation software PSCAD/EMTDC,and the simulation results show that the designed controller has good steady-state tracking performance,and the active power and reactive power control are less affected by each other.The control strategy is effective.