电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2015年
1期
69-75
,共7页
四象限级联型变频器%功率单元%母线电压波动%瞬时功率平衡%有功电流前馈控制
四象限級聯型變頻器%功率單元%母線電壓波動%瞬時功率平衡%有功電流前饋控製
사상한급련형변빈기%공솔단원%모선전압파동%순시공솔평형%유공전류전궤공제
four-quadrant cascade converter%power cell%DC bus voltage ripple%instantaneous power balance%active current feed-forward control
四象限级联型变频器功率单元 H 桥的瞬时输出功率以2倍和4倍频率脉动，使得直流母线产生2次和4次纹波电压。单个功率单元输入端PWM整流器采用前馈控制策略能有效抑制母线电压波动，且总的并网电流无低次谐波。从功率单元的数学模型出发，推导出输入输出的瞬时有功功率，提出了基于瞬时 abc 理论的瞬时有功电流前馈控制来抑制直流母线电压波动，同时建立了基于Kalman滤波的负载电流估计模型。最后通过功率单元实验测试，验证了控制策略的可行性。
四象限級聯型變頻器功率單元 H 橋的瞬時輸齣功率以2倍和4倍頻率脈動，使得直流母線產生2次和4次紋波電壓。單箇功率單元輸入耑PWM整流器採用前饋控製策略能有效抑製母線電壓波動，且總的併網電流無低次諧波。從功率單元的數學模型齣髮，推導齣輸入輸齣的瞬時有功功率，提齣瞭基于瞬時 abc 理論的瞬時有功電流前饋控製來抑製直流母線電壓波動，同時建立瞭基于Kalman濾波的負載電流估計模型。最後通過功率單元實驗測試，驗證瞭控製策略的可行性。
사상한급련형변빈기공솔단원 H 교적순시수출공솔이2배화4배빈솔맥동，사득직류모선산생2차화4차문파전압。단개공솔단원수입단PWM정류기채용전궤공제책략능유효억제모선전압파동，차총적병망전류무저차해파。종공솔단원적수학모형출발，추도출수입수출적순시유공공솔，제출료기우순시 abc 이론적순시유공전류전궤공제래억제직류모선전압파동，동시건립료기우Kalman려파적부재전류고계모형。최후통과공솔단원실험측시，험증료공제책략적가행성。
The instantaneous output power of the power cell H-bridge in four-quadrant cascade converter pulsates at twice and quadruple the output frequency, generating the second and fourth harmonic DC bus voltage. Using feed-forward control scheme in PWM rectifier of single power cell can effectively restrain DC bus voltage ripple and make the total grid-connected current without low-order harmonics. From the mathematical model of power cell, the instantaneous active power is derived. Based on instantaneous abc theory, instantaneous active current feed-forward control have been proposed to restrain the DC bus voltage ripple. Moreover, load current estimation model based on Kalman theory is established. Finally, the experimental results are given to prove the effectiveness of the proposed control scheme.
