Novel neural network based speed estimator for multilevel inverter fed sensorless field oriented controlled IM drive
- PDF / 4,037,578 Bytes
- 25 Pages / 439.37 x 666.142 pts Page_size
- 33 Downloads / 244 Views
Novel neural network based speed estimator for multilevel inverter fed sensorless field oriented controlled IM drive A. Venkadesan1 · K. Sedhuraman2 Received: 30 August 2018 / Accepted: 25 March 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract In this paper, a new reference model adaptive system based speed estimator is proposed for multilevel inverter fed sensorless field oriented controlled induction motor drive. The proposed scheme employs 2-neural network models which is novel in this paper. The proposed speed estimator is shown to overcome low speed problems. One of the FPGA implementation issues of NN model is the identification of appropriate bit precision. The performance of reference NN estimator is studied for various bit precision and the suitable bit precision is identified compromising the memory size (resource) and the accuracy. Further the suitability of multicarrier pulse width modulation techniques for multilevel inverter is also studied. The performance is compared in terms of magnitude of the output voltage and total harmonics distortion and suitable modulation technique is identified. The encouraging results obtained are presented. Keywords Neural network based speed estimator · Multilevel inverter · Modulation techniques · Induction motor drives · Sensorless drives
List of symbols vSds , vSqs iSds , iSqs S , ϕS ϕdr qr Rs , Rr Ls , Lr Lm Ts ωr
B
d-Axis Stator voltage, q-axis Stator voltage d-Axis Stator current, q-axis stator current d-Axis Rotor flux, q-axis rotor flux Stator resistance, rotor resistance Stator inductance, rotor inductance Magnetization inductance Sampling time Rotor speed (rad/s)
A. Venkadesan [email protected]
1
EEE Department, NIT Puducherry, Karaikal 609609, India
2
EEE Department, MVIT Puducherry, Karaikal, India
123
A. Venkadesan, K. Sedhuraman
Superscript s Stationary reference frame Superscript e Synchronous reference frame 1 − (Ts /Tr ) w1 ωr Ts w2 w3 (Lm Ts )/Tr
1 Introduction Over the years, the induction motors are the workhouse of many industries [1, 2]. The variable speed drives are used in many applications. There are many speed control methods available for induction motor. Out of which, vector control is the very much popular method to achieve high performance. The inverters are employed in vector control. Normally the two level inverters are employed which have the power harmonic profile which deteriorates the performance of the motor over a period. Now-a-days, multilevel inverters [3, 4] are gaining lot of momentum due to its advantages namely reduced total harmonics distortion (THD) and lower dV/dT stresses. Cascaded H-bridge topology is one of the famous topologies adopted for medium power drives due to its modularity and extensibility [3–6]. Various modulation techniques for 5 level cascaded H- bridge with RL load is investigated [4]. The multilevel inverter fed induction motor drive in open loop is investigated and it is reported [5, 6]. The green energy fed multilevel inverter is investigated [7]. Thus multilevel
Data Loading...
