CAJ | 학술논문

为了克服电力电子器件尤其是绝缘栅双极晶体管（IGBT）对风电机组功率容量和电压等级的束缚,提出了一种适用于六相双Y永磁同步发电机的风力发电变流装置。该装置将变拓扑结构的晶闸管整流桥和三电平逆变器分别作为前端和后端。前端整流器中,2个三相晶闸管整流桥之间的串并联关系可通过二极管与开关组成的辅助电路在运行过程中进行动态切换。在低风速时,2个整流桥串联,提升输入电压;在高风速时,2个整流桥并联,扩大功率容量,以适应风力发电机输出电压的宽范围变化。新型电流峰值控制方法替代了传统比例积分（PI）控制方法,消除了变结构可能造成的电流突变,实现了动态运行中拓扑结构的无缝切换。三电平逆变器在发电机接近额定功率时根据风力机转速线性提高母线电压,使得整流器相位移因数保持稳定,提高功率因数。实验结果验证了原理的正确性和装置的可行性。
위료극복전력전자기건우기시절연책쌍겁정체관（IGBT）대풍전궤조공솔용량화전압등급적속박,제출료일충괄용우륙상쌍Y영자동보발전궤적풍력발전변류장치。해장치장변탁복결구적정갑관정류교화삼전평역변기분별작위전단화후단。전단정류기중,2개삼상정갑관정류교지간적천병련관계가통과이겁관여개관조성적보조전로재운행과정중진행동태절환。재저풍속시,2개정류교천련,제승수입전압;재고풍속시,2개정류교병련,확대공솔용량,이괄응풍력발전궤수출전압적관범위변화。신형전류봉치공제방법체대료전통비례적분（PI）공제방법,소제료변결구가능조성적전류돌변,실현료동태운행중탁복결구적무봉절환。삼전평역변기재발전궤접근액정공솔시근거풍력궤전속선성제고모선전압,사득정류기상위이인수보지은정,제고공솔인수。실험결과험증료원리적정학성화장치적가행성。
A novel converter is proposed for wind turbines to free the converter＇ s power range from insulated gate bipolar transistors （IGBTs）. A flexible phase-controlled thyristor rectifier and a 3-level inverter are used as generator and grid interface separately. The rectifier is composed of two 3-phase thyristor rectifiers. The two parts can operate in either parallel mode or series mode. By using an auxiliary circuit with two diodes and a switch, the mode can be changed dynamically during the operation. The switching of topology during operation is to boost voltage under low wind speed and to extend the capacity in high speed. A novel peak current predictive controller substitutes the traditional proportional-integral （PI）, and a seamless switching transition during topology changing is realised. The 3-level inverter improves the DC-link voltage linearly when the output reaches the rated level, thus a constant displacement power factor （DPF） is achieved. Simulations and experiments verify the improved dynamic response and the seamless transition during topology switching.