CAJ | 학술논문

在大功率风力发电应用场合,将虚拟电网磁链作为定向矢量的方法应用于网侧变流器的控制中.建立了三电平网侧变流器的开关函数模型,并在简化三电平SVPWM算法的基础上,提出一种交流侧相电压重构方法.引入三阶级联低通滤波器代替积分环节,以保证所观测的磁链幅值和相位无偏差.针对传统虚拟磁链定向中初始定向角不准确的问题,采用了一种基于预充电回路的新型初始定向角观测方法.同时结合虚拟磁链定向技术,采用定频直接功率控制策略,实现网侧变流器的高动态性能运行.最后在双三电平双馈式风力发电对拖平台上进行了实验研究,实验结果验证了控制策略的正确性及可行性.
재대공솔풍력발전응용장합,장허의전망자련작위정향시량적방법응용우망측변류기적공제중.건립료삼전평망측변류기적개관함수모형,병재간화삼전평SVPWM산법적기출상,제출일충교류측상전압중구방법.인입삼계급련저통려파기대체적분배절,이보증소관측적자련폭치화상위무편차.침대전통허의자련정향중초시정향각불준학적문제,채용료일충기우예충전회로적신형초시정향각관측방법.동시결합허의자련정향기술,채용정빈직접공솔공제책략,실현망측변류기적고동태성능운행.최후재쌍삼전평쌍궤식풍력발전대타평태상진행료실험연구,실험결과험증료공제책략적정학성급가행성.
@@@@In high power wind generation applications, virtual flux orientation is applied in grid -side converter control. Switching function model of three-level grid-side converter is established. One method of AC-side phase voltage reconsitution is proposed based on simplified three-level SVPWM algorithm. In order to steady the phase and amplitude, three -order low pass filter is introduced. In allusion to the issue of inaccurate initial angle in traditional virtual flux, a novel initial angle observation method based on pre-charge circuit is applied. On the base of virtual flux orientation, high dynamic performance of converter is achieved using fixed-frequency direct power control strategy. The experiment study is taken on the platform of dual three-level DFIG system. The results verify the correctness and feasibility of the control strategy.