coefficient adj. 共同作用的。 n. 1.共同作用;協(xié)同因素。 2.【數(shù),物】系數(shù),率;程度。 coefficient of absorption 吸收率[系數(shù)]。 coefficient of expansion 膨脹系數(shù)。 coefficient of displacement 排水量[系數(shù)]。
Based on the investigation with several voltage control methods , such as venturini method , instantaneous double - voltage synthesis method and space vector modulation method ( svm ) , three new control strategies are put forward . firstly , a time - varying modulation coefficient svm method is proposed to improve mc ' s anti - disturbance performance under the asymmetry input voltage . secondly , a 5 - state switching strategy is presented for mc controlled by the svm method , which reduces the commutation number and switching losses remarkably 在分析了venturini控制法、瞬時雙電壓法、空間矢量法等電壓控制方法的基礎(chǔ)上,提出了在非對稱輸入條件下矩陣變換器空間矢量法的時變調(diào)制比改進(jìn)控制策略,提高了變換器的抗干擾性能;對空間矢量法的開關(guān)策略進(jìn)行了研究,提出了新型5狀態(tài)開關(guān)策略,在保證其他性能不受影響的條件下,減少了變換器的換流次數(shù)和開關(guān)損耗;提出了一種矩陣變換器單電壓合成的新方法,它不僅使得變換器的控制簡單,計算量減少,而且使得開關(guān)損耗達(dá)到最少。