Transformerless High Gain Boost and Buck-Boost DC-DC Converters Based on Extendable Switched Capacitor (SC) Cell for Stand-Alone Photovoltaic System

High-performance induction motor (IM) drives require fast dynamic responses, robust to parameter variations, withstand load disturbance, stable control systems, and support easy hardware/software implementation. Fuzzy logic control (FLC) for speed controllers is garnering attention from researchers, since it is proven to produce better results compared with the conventional PI speed controllers. However, fixed parameter FLC experiences performance degradation when the system operates away from the design point or is affected by parameter variations or load disturbances. The purpose of this paper is to design and implement a simple self-tuning fuzzy logic controller (ST-FLC) for IM drives application. The proposed self-tuning mechanism is able to adjust the output scaling factor of the main FLC speed controller by improving the accuracy of the crisp output. The IM drive employed an indirect field-oriented control (IFOC) method fed by a hysteresis current controller (HCC). The fixed parameter FLC for the main speed controller comprises nine rules that are tuned to achieve the best performance. Then, a simple self-tuning mechanism is applied to the main fuzzy logic speed controller. All simulation work was done using Simulink and fuzzy tools in the MATLAB software. The effectiveness of the proposed controller was investigated by conducting a comparative analysis between fixed parameter FLC and ST-FLC in forward and reverse speed operations, with and without load disturbances. Finally, the experimental testing was carried out to validate the simulation results with the aid of a digital signal controller board, dSPACE DS1104, with an induction motor drive system. Based on the results, the ST-FLC showed superior performance in transient and steady-state conditions in terms of various performance measures, such as overshoot, rise time, settling time, and recovery time.

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A Novel Self-Tuning Fuzzy Logic Controller Based Induction Motor Drive System: An Experimental Approach

Transformation matrices and the decoupling that occurs in balanced three-phase systems. Physical significance of zero sequence.

對稱座標法 = Symmetrical components

Phase change Material (PCM) has immense potential in the field of energy storage due to its latent heat capacity. In this study, accelerated thermal cycling is performed on Paraffin wax (PW) and Paraffin Wax/Polyaniline (PWP-1) composite up to 3000 cycles to evaluate its durability. The latent heat of PW reduced by 6.7% at the end of 3000 cycles, whereas the composite PWP-1 reduced by 9.8% but PWP-1 had higher latent heat values compared to PW. The melting temperature showed an increment with the number of thermal cycles with 11.7% and 23% increment for PW and PWP-1 composite respectively. Thermogravimetric analysis showed very little change in the weight degradation after thermal cycling, but the Fourier Transform Infrared Spectrometry showed a new absorption peak for PW and PWP-1, which may be due to the formation of carbon/char. Visual and microscopic images of the samples are analyzed. From the study it can be concluded that PWP-1 composite has better thermal reliability in terms of latent heat as compared to PW and can be used in the field of solar application like flat plate solar collector, photovoltaic thermal system and low concentrated photovoltaic thermal systems for the production of domestic hot water application.

Long-term thermophysical behavior of paraffin wax and paraffin wax/polyaniline (PANI) composite phase change materials

PI fuzzy controller with adaptive proportional adjustment.A adaptive proportional adjustment fuzzy controller was proposed.It used only 6 regulation rules,simplified computation.Simulation results showed that the controller had better kinetic and static performance.

A PI type Fuzzy Controller with Self tuning Scaling Factors

PV inverter with decoupled active and reactive power control to mitigate grid faults

This paper presents the improvement method for
simplified Fuzzy Logic Controller (FLC) for Induction Motor
Drive. This method is aimed to enhance performance for
variable speed drive performance in a rated forward and
reverse operation. The implementation of simplified rules
based is able to reduce the computational burden and memory
space limitation. However, the speed performance shows some
degradation with regards to simplification process. Thus, the
propose improvement method is made to increase the error
gain parameter. The membership function (MF) domain for
error is increased from nominal 1 to 2. It increases the torque
current and improves the speed response. The speed control is applied to the indirect Field Oriented Control method fed with Space Vector Pulse Width Modulation (SVPWM). The real time implementation is done using dSPACE DS1103 controller. The performance results are compared between simplified rules method, simplified rules improvement method and Anti-Windup Proportional Controller (AWPI). The results show improvement in terms of rise time, overshoot and settling time compared to its counterparts.

Performance improvement of induction motor drive using simplified FLC method

Without utilizing zero vectors, reduced common-mode voltage pulsewidth modulation (RCMV-PWM) have been proposed to reduce the common-mode voltage (CMV) and the leakage current in three-phase transformerless photovoltaic (PV) inverter. Nevertheless, the elimination of the zero vectors from RCMV-PWM methods have degraded the overall performance of the PV inverters such as cost, voltage linearity, dc-link current ripples and harmonic distortion. In order to solve these issues, H7 inverter with modified discontinuous pulsewidth modulation (MDPWM) is proposed recently. The leakage current is reduced without sacrificing the performance of the PV inverter. In this paper, a simple three-phase inverter topology with corresponding modulation technique is proposed. It is proven that the leakage current is reduced to comply with the standard requirement without sacrificing the performance of the PV inverter. The analysis and the performance are verified via simulation results.

An Improved Three-Phase Transformerless Photovoltaic Inverter with Reduced Leakage Currents

Renewable power generation's increased importance is owed to increased population and pollution concerns, global warming, and need for new energy resources Solar energy is a completely clean energy resource and can be used almost anywhere; its application the focus of most research on it Photovoltaic generation systems are reviewed here, in single-resource implementation and in various hybrid systems, and related past works on sizing and reliability issues are surveyed

Photovoltaic power generation: A review

Fuzzy Logic Speed Controller (FLSC) has been widely used for motor drive due to its robustness and its non-reliance to real plant parameters. However, it is computationally expensive to be implemented in real-time and prone to the fuzzy rules' selection error which results in the failure of the drive's system. This paper proposes an improved simplified rules method for Fuzzy Logic Speed Controller (FLSC) based on the significant crisp output calculations to address these issues. A systematic procedure for the fuzzy rules reduction process is first described. Then, a comprehensive evaluation of the activated crisp output data is presented to determine the fuzzy dominant rules. Based on the proposed method, the number of rules was significantly reduced by 72%. The simplified FLSC rule is tested on the Induction Motor (IM) drives system in which the real-time implementation was carried out in the dSPACE DS1103 controller environment. The simulation and experimental results based on the proposed FLSC have proved the workability of the simplified rules without degrading the motor performance.

N. Abd Rahim

Papers

PV inverter with decoupled active and reactive power control to mitigate grid faults

Performance improvement of induction motor drive using simplified FLC method

An Improved Three-Phase Transformerless Photovoltaic Inverter with Reduced Leakage Currents

Photovoltaic power generation: A review

An improved simplified rules Fuzzy Logic Speed Controller method applied for induction motor drive.