CAJ | 학술논문

双馈(DFIG)风电机组低电压穿越(LVRT)是风电厂并网运行的重要条件,提出了一种集成Crowbar硬件电路与网侧变流器不对称加强控制的LVRT综合控制策略.该策略中Crowbar优化投切判据根据电网故障类型自动判断投入切出时间,具有更强的灵活性及适用性;网侧变流器(GSC)在改进不对称预测电流控制的基础上增加了无功输出补偿控制,具有控制模型精确、控制效果好、具备无功支撑能力的特点.采用RTDS(实时数字仿真器)和自主开发的DSP控制器,开发了DFIG风电机组LVRT的数字/物理混合实时仿真系统,并对一台2 MW风电机组进行了电网三相短路与两相短路下的LVRT数字/物理混合实时仿真,验证了所提综合策略的正确性和混合仿真方案的有效性.
쌍궤(DFIG)풍전궤조저전압천월(LVRT)시풍전엄병망운행적중요조건,제출료일충집성Crowbar경건전로여망측변류기불대칭가강공제적LVRT종합공제책략.해책략중Crowbar우화투절판거근거전망고장류형자동판단투입절출시간,구유경강적령활성급괄용성;망측변류기(GSC)재개진불대칭예측전류공제적기출상증가료무공수출보상공제,구유공제모형정학、공제효과호、구비무공지탱능력적특점.채용RTDS(실시수자방진기)화자주개발적DSP공제기,개발료DFIG풍전궤조LVRT적수자/물리혼합실시방진계통,병대일태2 MW풍전궤조진행료전망삼상단로여량상단로하적LVRT수자/물리혼합실시방진,험증료소제종합책략적정학성화혼합방진방안적유효성.
@@@@The low voltage ride through (LVRT) of DFIG is an irreplaceable requirement for the wind power plant connection. Based on the analysis of the LVRT on the current DFIG, this paper proposes a comprehensive LVRT control strategy integrated with asymmetric strengthen control of GSC and optimized switching of Crowbar. In this strategy, the time of cut in and off for Crowbar can be determined automatically, which is more flexible and valid. Based on the improvement of the predictive control on asymmetrical conditions, the reactive power compensating output is added to the GSC, which has a more accuracy model, a better control effect and a perfect reactive supporting ability. In order to verify the accuracy and practicability of the LVRT control strategy, a digital/physical hybrid real time simulation (D/PHS) of LVRT, by using the RTDS (real time digital simulator) and independent developed DSP controller, is developed. A 2 MW wind turbine is simulated on this system during three-phase and two-phase short-circuit fault, which verifies the availability and practicability of the proposed strategy.