CAJ | 학술논문

针对电压源型换流器多端直流系统，提出了一种直流电压自适应斜率控制策略。该控制策略考虑了换流站运行工况及功率裕度，将稳定直流电压的任务分配给多个换流站，保证了功率裕度较少的换流站分担较少的不平衡功率，功率裕度较大的换流站则承担较多的不平衡功率，实现了不平衡功率的合理分配，避免换流站在按照固定直流电压斜率运行时因满载无法对直流网络潮流变化进行响应的情况。最后在 PSCAD/EMTDC 中以一个四端柔性直流输电系统为例进行仿真，验证了所提出的控制策略的有效性。
침대전압원형환류기다단직류계통，제출료일충직류전압자괄응사솔공제책략。해공제책략고필료환류참운행공황급공솔유도，장은정직류전압적임무분배급다개환류참，보증료공솔유도교소적환류참분담교소적불평형공솔，공솔유도교대적환류참칙승담교다적불평형공솔，실현료불평형공솔적합리분배，피면환류참재안조고정직류전압사솔운행시인만재무법대직류망락조류변화진행향응적정황。최후재 PSCAD/EMTDC 중이일개사단유성직류수전계통위례진행방진，험증료소제출적공제책략적유효성。
An adaptive direct current (DC) voltage droop control strategy for sharing the unbalanced power according to the available headroom of each converter station is proposed for the voltage source converter based multi-terminal high voltage direct current(VSC-MTDC) system.The converters already operating close to the rating would share less unbalanced power than the extent of the other converters with more spare headroom,thus avoiding out of action to DC system changes which may take place with a fixed value of power-voltage droop.Finally,simulations are performed in PSCAD/EMTDC to verify the validity of the control strategy under different operating conditions.Simulation results show that the adaptive droop control strategy performs well when the VSC-MTDC system is operating under different conditions.