CAJ | 학술논문

为了避免多端直流输电系统(multi-terminal DC，MTDC)对各换流站之间高速通信的要求，实现各换流站间的自主协调控制，基于电压源型换流器的电压-电流特性和故障时减少风功率注入的思想，提出了一种应用于大规模海上风电场功率远距离外送的多端直流输电系统协调控制策略。在多端直流输电系统正常运行时，网侧换流器不仅可以控制直流电压的稳定，而且可灵活对电网进行风电功率传输。在多端直流输电系统故障运行时，风场侧换流器来保持直流电压的稳定和协调风场间各风机出力。最后，搭建了Matlab/Simulink仿真模型，针对所提出控制策略的动态性能进行了仿真验证，结果表明所提控制策略能够保持直流电压在交直流故障等大扰动下相对稳定，维持系统正常运行。
위료피면다단직류수전계통(multi-terminal DC，MTDC)대각환류참지간고속통신적요구，실현각환류참간적자주협조공제，기우전압원형환류기적전압-전류특성화고장시감소풍공솔주입적사상，제출료일충응용우대규모해상풍전장공솔원거리외송적다단직류수전계통협조공제책략。재다단직류수전계통정상운행시，망측환류기불부가이공제직류전압적은정，이차가령활대전망진행풍전공솔전수。재다단직류수전계통고장운행시，풍장측환류기래보지직류전압적은정화협조풍장간각풍궤출력。최후，탑건료Matlab/Simulink방진모형，침대소제출공제책략적동태성능진행료방진험증，결과표명소제공제책략능구보지직류전압재교직류고장등대우동하상대은정，유지계통정상운행。
To avoid the high-speed communication between multi-terminal DC (MTDC) transmission system and converter stations and to implement the autonomous coordinated control among converter stations, based on the voltage-current characteristic of voltage source converters and the idea of reducing the wind power injected into power grid during faults, a coordinated control strategy applied in large-scale offshore wind farm to outward transmit wind power via MTDC transmission system is proposed. When MTDC transmission system is operated under normal condition, not only the stability of DC voltage can be controlled by converters at power grid side, but also the wind power transmitted to power grid can be flexibly controlled. When MTDC transmission system is operated under abnormal condition, the stability of DC voltage can be sustained by converters at wind farm side. Matlab/Simulink based simulation verification for dynamic performance of the proposed control strategy is performed, and simulation results show that using the proposed control strategy the DC voltage can be kept relative stable under large disturbance such as faults occurred in AC or DC system to sustain normal operation of MTDC transmission system.