CAJ | 학술논문

输入电压不平衡会导致三相电压型PWM整流器谐波增加、损耗增大,严重时可以烧坏整流器.针对传统的解决方案结构较复杂、运算量大,提出虚拟导纳控制法.根据三相电压型PWM整流器不平衡时瞬时功率平衡理论,找到虚拟导纳这一核心控制量,引入可实现电流无静差控制的广义积分器,形成两相静止坐标系下电流控制简化方法,由此设计了虚拟导纳控制系统.通过Matlab仿真和实验验证表明该控制方法不仅性能稳定,实现三相电压不平衡时电压无波纹控制和实时可控的功率因数,而且不需要对正负序电流进行独立检测,提高了系统的快速性.引入的广义积分器具有的简单离散迭代算法也大幅减少了计算量.
수입전압불평형회도치삼상전압형PWM정류기해파증가、손모증대,엄중시가이소배정류기.침대전통적해결방안결구교복잡、운산량대,제출허의도납공제법.근거삼상전압형PWM정류기불평형시순시공솔평형이론,조도허의도납저일핵심공제량,인입가실현전류무정차공제적엄의적분기,형성량상정지좌표계하전류공제간화방법,유차설계료허의도납공제계통.통과Matlab방진화실험험증표명해공제방법불부성능은정,실현삼상전압불평형시전압무파문공제화실시가공적공솔인수,이차불수요대정부서전류진행독립검측,제고료계통적쾌속성.인입적엄의적분기구유적간단리산질대산법야대폭감소료계산량.
Unbalanced input voltage leads to the increase of harmonic and loss in three-phase PWM rectifier. As the traditional solutions to it have relatively complex structure and large calculation load,a simplified current control under two-phase stationary frame is proposed,which takes the virtual admittance as the key control variable based on the balanced instantaneous power theory of three-phase PWM rectifier under unbalanced input voltage conditions ,and applies the generalized integrator to realize zero-steady state error. The virtual admittance control system is designed accordingly. Matlab simulation and experiments verify that,the control strategy can not only realize no-ripple voltage control and real-time controllable power factor under unbalanced three-phase voltage with its stable performance,hut also need not to detect three-phase positive and negative sequence ac currents respectively, resulting in the improvement of system speediness. The introduced generalized integrator also has simple discrete iterative algorithm to greatly reduce calculation time.