åé¢å¨æ§å¶æ¹å¼
ããä½åéç¨åé¢è¾åºçµå为380ï½650Vï¼
è¾åºåç为0.75ï½400kWï¼å·¥ä½é¢ç为0ï½400Hzï¼å®ç主çµè·¯é½éç¨äº¤ç´äº¤çµè·¯ãå
¶æ§å¶æ¹å¼ç»åäºä»¥ä¸å代ã
ãã1 U/f=Cçæ£å¼¦è宽è°å¶ï¼SPWMï¼æ§å¶æ¹å¼
ããå
¶ç¹ç¹æ¯æ§å¶çµè·¯ç»æç®åãææ¬è¾ä½ï¼æºæ¢°ç¹æ§ç¡¬åº¦ä¹è¾å¥½ï¼è½å¤æ»¡è¶³ä¸è¬ä¼ å¨çå¹³æ»è°éè¦æ±ï¼å·²å¨äº§ä¸çå个é¢åå¾å°å¹¿æ³åºç¨ãä½æ¯ï¼è¿ç§æ§å¶æ¹å¼å¨ä½é¢æ¶ï¼ç±äºè¾åºçµåè¾ä½ï¼è½¬ç©åå®åçµé»åéçå½±åæ¯è¾æ¾èï¼ä½¿è¾åºæ大转ç©åå°ãå¦å¤ï¼å
¶æºæ¢°ç¹æ§ç»ç©¶æ²¡æ
ç´æµçµå¨æºç¡¬ï¼å¨æ转ç©è½ååéæè°éæ§è½é½è¿ä¸å°½å¦äººæï¼ä¸ç³»ç»æ§è½ä¸é«ãæ§å¶æ²çº¿ä¼éè´è½½çååèååï¼è½¬ç©ååºæ
¢ã
çµæºè½¬ç©å©ç¨çä¸é«ï¼ä½éæ¶å å®åçµé»å
éåå¨æ»åºæåºçåå¨èæ§è½ä¸éï¼ç¨³å®æ§åå·®çãå æ¤äººä»¬åç 究åºç¢éæ§å¶åé¢è°éã
ãã2 çµå空é´ç¢éï¼SVPWMï¼æ§å¶æ¹å¼
ããå®æ¯ä»¥ä¸ç¸æ³¢å½¢æ´ä½çæææ为åæï¼ä»¥é¼è¿çµæºæ°éççæ³åå½¢æ转ç£åºè½¨è¿¹ä¸ºç®çï¼ä¸æ¬¡çæä¸ç¸è°å¶æ³¢å½¢ï¼ä»¥å
å
å¤è¾¹å½¢é¼è¿åçæ¹å¼è¿è¡æ§å¶çãç»å®è·µä½¿ç¨ååæææ¹è¿ï¼å³å¼å
¥é¢çè¡¥å¿ï¼è½æ¶é¤é度æ§å¶ç误差ï¼éè¿åé¦ä¼°ç®
ç£é¾å¹
å¼ï¼æ¶é¤ä½éæ¶å®åçµé»çå½±åï¼å°è¾åºçµåãçµæµéç¯ï¼ä»¥æé«å¨æç精度å稳å®åº¦ãä½æ§å¶çµè·¯ç¯èè¾å¤ï¼ä¸æ²¡æå¼å
¥è½¬ç©çè°èï¼æ以系ç»æ§è½æ²¡æå¾å°æ ¹æ¬æ¹åã
ãã3 ç¢éæ§å¶ï¼VCï¼æ¹å¼
ããç¢éæ§å¶åé¢è°éçåæ³æ¯å°
å¼æ¥çµå¨æºå¨ä¸ç¸
åæ ç³»ä¸çå®åçµæµIaãIbãIcãéè¿ä¸ç¸ï¼äºç¸åæ¢ï¼çææ两ç¸éæ¢åæ ç³»ä¸ç交æµçµæµIa1Ib1ï¼åéè¿æ转åç£åºå®åæ转åæ¢ï¼çææåæ¥æ转åæ ç³»ä¸çç´æµçµæµIm1ãIt1ï¼Im1ç¸å½äºç´æµçµå¨æºç
å±ç£çµæµï¼It1ç¸å½äºä¸è½¬ç©ææ£æ¯ççµæ¢çµæµï¼ï¼ç¶å模仿ç´æµçµå¨æºçæ§å¶æ¹æ³ï¼æ±å¾ç´æµçµå¨æºçæ§å¶éï¼ç»è¿ç¸åºçåæ ååæ¢ï¼å®ç°å¯¹å¼æ¥çµå¨æºçæ§å¶ãå
¶å®è´¨æ¯å°äº¤æµçµå¨æºçæ为ç´æµçµå¨æºï¼åå«å¯¹é度ï¼ç£åºä¸¤ä¸ªåéè¿è¡ç¬ç«æ§å¶ãéè¿æ§å¶è½¬åç£é¾ï¼ç¶åå解å®åçµæµèè·å¾è½¬ç©åç£åºä¸¤ä¸ªåéï¼ç»åæ åæ¢ï¼å®ç°æ£äº¤æ解è¦æ§å¶ãç¢éæ§å¶æ¹æ³çæåºå
·æåæ¶ä»£çæä¹ãç¶èå¨å®é
åºç¨ä¸ï¼ç±äºè½¬åç£é¾é¾ä»¥åç¡®è§æµï¼ç³»ç»ç¹æ§åçµå¨æºåæ°çå½±åè¾å¤§ï¼ä¸å¨çæç´æµçµå¨æºæ§å¶è¿ç¨ä¸æç¨ç¢éæ转åæ¢è¾å¤æï¼ä½¿å¾å®é
çæ§å¶ææé¾ä»¥è¾¾å°çæ³åæçç»æ