Indian Journal of Science and Technology
DOI: 10.17485/ijst/2016/v9i9/84594
Year: 2016, Volume: 9, Issue: 9, Pages: 1-8
Original Article
Pilla Ramana1*, Karlapudy Alice Mary2 , Munagala Surya Kalavathi3 and Jallu Hareesh Kumar4
1Department of EEE, GMR Institute of Technology, Rajam, Srikakulam - 532127, Andhra Pradesh, India; [email protected], [email protected] 2Vignan's Institute of Information Technology, Visakhapatnam - 533045, Andhra Pradesh, India; [email protected] 3Department of EEE, JNTU College of Engineering, JNTUH, Hyderabad - 500085, Telangana, India; [email protected] 4Sri Venkateswara College of Engineering and Technology, Srikakulam - 532410, Andhra Pradesh, India; [email protected]
*Author for Correspondence
Pilla Ramana Department of EEE, GMR Institute of Technology, Rajam, Srikakulam - 532127, Andhra Pradesh, India; [email protected]
Objectives: This paper proposes the state estimation of Permanent Magnet Synchronous Motor (PMSM) by designing and comparing two non-linear observers such as reduced order and full order observers. Methods: Control system design for an inverter fed PMSM drive can be carried out using conventional two loop structure; which are outer speed loop and inner current loop. Conventional control system design uses the classical transfer function approach for Single-Input Single Output (SISO) systems. Proportional plus Integral (PI) controllers were designed for individual control loops. The PI controller transient response is slow, which can be improved through state feedback by using pole placement technique. The State Feedback Controller (SFC) of a PMSM drive requires all the state information. In PMSM, damper winding currents are usually inaccessible and need to be estimated using an observer. Findings: A non-linear reduced order observer is designed in order to estimate the damper winding currents of PMSM where as to estimate both damper winding and stator winding currents a non-linear full order observer is proposed. The performances of two observers for the drive system are verified and compared through the extensive simulations using MATLAB/SIMULINK implementation. Applications: Generally the states of the drive system are estimated using sensors, resulting the cost and complexity of the drive system increases. Also the estimated states are inaccurate due to parameter imperfections. So in order to overcome these problems, one can design a non-linear reduced/full order observer
Keywords: Full Order Observer, Permanent Magnet Synchronous Motor, Reduced Order Observer, Rotor Reference Frame, State Feedback Controller
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