CAJ | 학술논문

以西北电网千万千瓦级风场为背景，提出了采用相控换流器与STATCOM结合的多端直流输电技术进行大规模风电并网的方法。从两个层面上进行控制器的设计，一是从含有STATCOM的整流器交流侧子系统角度，针对策略的快速响应能力以及良好的控制特性。STATCOM非线性特性，引入逆系统方法设计其控制器并推导整流器直流侧电流与STATCOM直流侧电压的关系，提出适合于整流器的控制策略，保证交流侧功率平衡。其次从 MTDC整体性能出发，设计相应的控制策略来确保系统稳定运行。在PSCAD/EMTDC中的仿真结果验证了所提控制策略的快速响应能力以及良好的控制特性。
이서북전망천만천와급풍장위배경，제출료채용상공환류기여STATCOM결합적다단직류수전기술진행대규모풍전병망적방법。종량개층면상진행공제기적설계，일시종함유STATCOM적정류기교류측자계통각도，침대책략적쾌속향응능력이급량호적공제특성。STATCOM비선성특성，인입역계통방법설계기공제기병추도정류기직류측전류여STATCOM직류측전압적관계，제출괄합우정류기적공제책략，보증교류측공솔평형。기차종 MTDC정체성능출발，설계상응적공제책략래학보계통은정운행。재PSCAD/EMTDC중적방진결과험증료소제공제책략적쾌속향응능력이급량호적공제특성。
This paper proposes the line-commutated converter based multi-terminal HVDC (LCC-MTDC) combining with the static synchronous compensator (STATCOM) for doubly-fed induction generator (DFIG) based wind farms integration in the context of Northwest Grid (NG) in China. The control strategies design is approached from two aspects. One aims to the AC system on the rectifier side. To coordinate the wind farm, STATCOM and rectifier, the inverse system method is introduced to design the controller in view of the nonlinear characteristic of STATCOM. Meanwhile, the control strategy for the rectifier is proposed to balance the active power in the subsystem and ensure the DC link voltage of STATCOM constant. On the other hand, the single-point voltage control strategy suitable for LCC-MTDC is conceived to guarantee the stable operation of the system by considering the control characteristics of both rectifiers and inverters. Simulations carried out in PSCAD/EMTDC have proven that the proposed control strategies possess favorable control performance and fast response speed.