Novel Wavelet-Fuzzy Based Indirect Field Oriented Control of Induction Motor Drives

Abstract

This paper presents a wavelet-fuzzy based controller for indirect field oriented control of three-phase induction motor drives. The discrete wavelet transform is used to decompose the error between the actual speed and the command speed of the induction motor drive into different frequency components. The transformed error coefficients along with the scaling gains are used for generating the control component of the motor. Self-tuning fuzzy logic is used for online tuning of the scaling gains of the controller. The proposed controller has the ability to meet the speed tracking requirements in the closed loop system. The complete indirect field oriented control scheme incorporating the proposed wavelet-fuzzy based controller is investigated theoretically and simulated under various dynamic operating conditions. The simulation results are compared with a conventional proportional integral controller and a fuzzy based controller. The speed control scheme incorporating the proposed controller is implemented in real time using a digital processor control board. Simulation and experimental results validate the effectiveness of the proposed controller.

Sliding Mode Controller and Lyapunov Redesign Controller to Improve Microgrid Stability: A Comparative Analysis with CPL Power Variation

“…There are three basic compensation techniques to handle the microgrid instability: (i) feeder side compensation technique, (ii) intermediate circuitry based compensation technique, and (iii) load side compensation technique. In this paper, the storage-based load side compensation technique is adopted due to superior robustness and cost effectiveness among these techniques [35][36][37][38][39][40][41][42]. Adopting storage-based load side compensation in this paper, a comparative performance analysis will be presented for SMC and LRC techniques with the variation of the CPL power.…”

Performance Enhancement of PID Controllers by Modern Optimization Techniques for Speed Control of PMBL DC Motor

“…This is because of their various merits such as it can be easily be understood by plant operators, near optimal performance, wide applicability etc (Mitra and Singh, 2013). Moreover conventional PID controller is very sensitive to step change of command speed, parameter variation and load disturbances (Febin Daya et al, 2013). However to improve performance of PID controller, it is necessary to tune the parameters of PID controller (Bindu and Namboothiripad, 2012).…”

Wavelet transform as a postprocessing diagnostic tool for fault identifications of high-voltage direct current transmission system

“…The instantaneous power is calculated and fed as input to DWT, which begins processing when a discrete signal x[n] of length N is transmitted. DWT can easily distinguish between the instantaneous power into high-pass signal resulting in an impulse response h[n] and that into a low-pass signal resulting in an impulse g[n], mathematically expressed as follows (Saleh 2013;Hui et al 2015;Febin Daya et al 2013a, 2013bSanjeevikumar et al 2015aSanjeevikumar et al , 2015bSanjeevikumar et al , 2015cMallat 1989): [n] are the outputs of the high-and low-pass filters, respectively. After this processing, again the output from the low-pass filter is down-sampled by two and passed through a lowand a high-pass filter, which resembles the ones in the first level, written as follows (second level of decomposition):…”

“…To be noted, several types of wavelet filters are available and have been investigated, but the minimum description length (MDL) is chosen as the best criterion and is mathematically represented as follows (Febin Daya et al 2013a, 2013bSanjeevikumar et al 2015aSanjeevikumar et al , 2015bSanjeevikumar et al , 2015cMallat 1989):…”

“…However, under high-power transmission conditions or produced complex strategies, they do not effectively find the fault that has actually occurred. Discrete wavelet transformation (DWT) has found wider applications recently for controlling the AC/DC drives and motors with major benefits and is discussed in detail by Saleh (2013), Hui et al (2015), Febin Daya et al (2013a, 2013b, and Sanjeevikumar et al (2015aSanjeevikumar et al ( , 2015bSanjeevikumar et al ( , 2015c. Furthermore, wavelet transforms are applied in the field of HVDC transmission for diagnosis of fault location, analysis, and DC-link failure, but…”