CAJ | 학술논문

基于双馈风机的风电场大规模并网将导致电网等效惯量降低、一次调频能力不足.为了使双馈风机同时具备惯性调频和一次调频能力,并解决传统模拟惯性控制方法容易引起的二次频率冲击问题,提出了一种结合超速备用和模拟惯性的双馈风机有功频率控制策略.双馈风机在电网频率正常时运行在超速减载状态,获得一定的调频备用容量并提高转子存储动能;在系统频率变化时,通过检测电网频率偏差、调节参考转速来改变输出功率,参与系统调频.该策略可以使双馈风机具有和常规机组类似的静态调频特性,能有效支持系统的惯性调频,减小静态频率误差,并避免转速恢复对系统频率的二次冲击.最后通过仿真验证了所提控制策略的有效性.
기우쌍궤풍궤적풍전장대규모병망장도치전망등효관량강저、일차조빈능력불족.위료사쌍궤풍궤동시구비관성조빈화일차조빈능력,병해결전통모의관성공제방법용역인기적이차빈솔충격문제,제출료일충결합초속비용화모의관성적쌍궤풍궤유공빈솔공제책략.쌍궤풍궤재전망빈솔정상시운행재초속감재상태,획득일정적조빈비용용량병제고전자존저동능;재계통빈솔변화시,통과검측전망빈솔편차、조절삼고전속래개변수출공솔,삼여계통조빈.해책략가이사쌍궤풍궤구유화상규궤조유사적정태조빈특성,능유효지지계통적관성조빈,감소정태빈솔오차,병피면전속회복대계통빈솔적이차충격.최후통과방진험증료소제공제책략적유효성.
Large scale integration of DFIGs-based wind farms in power system would reduce system equivalent inertia and capability of primary frequency control. To enhance DFIG frequency control ability and avoid secondary frequency drop, this paper presents a new frequency control strategy based on combination of virtual inertia and over-speed control. DFIGs work at higher speed using over-speed control to store more kinetic energy and gain reserve capacity, and their active power output can be changed with virtual inertia control to respond frequency deviation after system disturbance. Using this proposed method, DFIGs achieve frequency regulation performance similar to that of synchronous generators, providing effective inertia support and certain reserved capacity and reducing risk of secondary frequency drop. Simulations performed verified validity of the proposed method.