CAJ | 학술논문

双馈风力发电场经柔性高压直流输电系统（ VSC-HVDC ）把风电大规模外送。针对电网交流侧输出端出现故障以及VSC-HVDC输出功率能力下降将导致直流侧功率过剩，直流侧电压上升等问题，提出一种能够维持传输功率平衡，并能够实现风电场低电压穿越（ LVRT ）的应用方法。该方法在直流侧加装卸荷装置，消耗VSC-HVDC两端不平衡引起的“功率差”能量，使风机组不脱网稳定运行。结合新疆某风场算例进行仿真分析，仿真结果验证了该方法的有效性。
쌍궤풍력발전장경유성고압직류수전계통（ VSC-HVDC ）파풍전대규모외송。침대전망교류측수출단출현고장이급VSC-HVDC수출공솔능력하강장도치직류측공솔과잉，직류측전압상승등문제，제출일충능구유지전수공솔평형，병능구실현풍전장저전압천월（ LVRT ）적응용방법。해방법재직류측가장사하장치，소모VSC-HVDC량단불평형인기적“공솔차”능량，사풍궤조불탈망은정운행。결합신강모풍장산례진행방진분석，방진결과험증료해방법적유효성。
Double-fed wind farms use the VSC-HVDC grid system to deliver large-scale power .If the fault occurs at the output terminal of the AC sideand the power output capacity of the VSC-HVDC decreases , then power surplus and voltage rise will occur at the DC side .In view of these problems , this paper proposed a method to maintain the bal-ance of power transmission and achieve the LVRT of the wind farm .An unloading device was installed at the DC side to consume the “power gap” energy caused by the imbalance of both ends of the VSC-HVDC so that the blower set would not run off-grid and keep the system stable .With a Xinjiang wind field as the example ,simulations were made and the results verified the effectiveness of the method .