3 . the dissertation proposes the extended kalman filter based to estimate the fundamental symmetrical component of the ps and the frequency while the frequency is unknown 在電動機變頻調(diào)速系統(tǒng)的頻率未知條件下,給出了基本正序?qū)ΨQ分量和頻率估計的擴展卡爾曼濾波方法。
At first , this paper use the theory of symmetrical components method analyse varieties of symmetrical and asymmetrical faults of motor , and adopt the measuring method of negative and zero sequence . especially study deeply in the overload protection 本文首先采用對稱分量法理論分析了電機的各種對稱性故障和不對稱性故障,在應用中采用了負序和零序電流的檢測方法,特別在過載保護上進行了深入的研究。
The device can protect the large - scale synchronous motor perfectly . the protection device makes the mature theory such as the over - current value detection , symmetrical component principle and so on as protection criterions and uses the advanced digital signal processor in the device 該保護裝置運用較為成熟的保護理論和先進的數(shù)字信號處理器,把判過電流幅值與對稱分量法理論相結合,準確實現(xiàn)同步電動機保護所要求的各項保護功能。
Aiming at the unsymmetrical three phase voltages from inverter after a failure , the dissertation get the relationship among the positive sequence ( ps ) , negative sequence ( ns ) and the instantaneous symmetrical component of the ps , this build the foundation to detect the fault and to get the fault feature 針對逆變器故障后的電壓輸出的不對稱性,利用對稱分量法對逆變器輸出信號進行分析,獲得了逆變器輸出信號的數(shù)字信號模型,為變頻調(diào)速系統(tǒng)的故障檢測與故障特征提取奠定了基礎。 3