CAJ | 학술논문

在双馈风机(DFIG)中使用 Crowbar 电路是提高风机低电压穿越能力的一种常用措施,为协调 Crowbar 与风电场集电线路保护动作之间的关系,提出了集电线路电流保护新的整定方法与控制策略.在 Matlab/Simulink 中建立了含有 Crowbar 电路的风电场并网模型,投入 Crowbar 能够有效提高风机抵御电网电压跌落的性能,但使得风电场集电线路故障电流峰值减小并迅速衰减.对此针对电流速断保护提出采用功率方向元件判断故障区结合快速保护算法,并对整定值进行修正,后备保护采用自保持电路并增加电压判据的控制策略.仿真结果表明,该策略能够满足风电场联络线故障的可靠切除及主网故障时低电压穿越运行的要求.
재쌍궤풍궤(DFIG)중사용 Crowbar 전로시제고풍궤저전압천월능력적일충상용조시,위협조 Crowbar 여풍전장집전선로보호동작지간적관계,제출료집전선로전류보호신적정정방법여공제책략.재 Matlab/Simulink 중건립료함유 Crowbar 전로적풍전장병망모형,투입 Crowbar 능구유효제고풍궤저어전망전압질락적성능,단사득풍전장집전선로고장전류봉치감소병신속쇠감.대차침대전류속단보호제출채용공솔방향원건판단고장구결합쾌속보호산법,병대정정치진행수정,후비보호채용자보지전로병증가전압판거적공제책략.방진결과표명,해책략능구만족풍전장련락선고장적가고절제급주망고장시저전압천월운행적요구.
Crowbar is commonly used in doubly fed induction generator (DFIG) to raise low voltage ride through capability. To coordinate Crowbar and contact line protection in wind farm, a new setting method and control strategy are proposed. Crowbar simulation model is built up in MATLAB/Simulink. Crowbar circuit can improve the LVRT capability of the wind farm, but the current of the protection devices on the contact line decreases rapidly. In order to make protection act correctly, a control strategy is proposed, which combines power flow directional element with fast protection algorithms, corrects setting value for the instantaneous over-current protection, adopts self-maintaining circuit for the back-up protection and adds voltage criteria. The simulation result shows this strategy can make the fault on connection line be cut reliably and raise LVRT capability when faults are on the grid.