Quasi-Z-Source Indirect Matrix Converter Fed Induction Motor Drive for Flow Control of Dye in Paper Mill
Abstract
This paper describes a flow control of the dye in the paper mill with the Quasi-Z-Source Indirect Matrix Converter (QZSIMC) fed induction motor drive. More than a decade Voltage Source Inverter (VSI) and Current Source Inverter (CSI) have been used to control the speed of the induction motor which in turns controls the flow of dye. Recently Matrix Converter (MC) has been an excellent competitor for the VSI or CSI for its compactness. The voltage transfer ratio of the VSI, CSI and MC has been limited to 0.866. Thus the efficiency of these converters is less. To improve the voltage transfer ratio the Quasi-Z- Source Network (QZSN) is to be used between voltage source and Indirect Matrix Converter (IMC). Modification in the shoot through duty ratio of the QZSN varies the voltage transfer ratio greater than 0.866. The different voltage transfer ratio is needed for different voltage sag condition. For a variation of the duty ratio of the QZSN, the fuzzy logic controller has been presented. To control the IMC vector control with Space Vector Modulation (SVM) has been presented. This paper proposes the implementation of QZSIMC adjustable speed drive for flow control of dye in paper mill during different voltage sag conditions. A 4kW prototype has been built and effectiveness of the proposed system is verified with simulation results and experimental setup. Simulation is done in MATLAB, Simulink platform. Experimental setup is done with the aid of TMS320F2812 (Texas Instrument) processor. The experimental results validate the maintenance of the speed of induction motor at set condition, thus controlling the perfect flow of dye in paper manufacturing technology.
PROPOSED SYSTEM:
Flow of dye depends on the speed of induction motor. When voltage sag occurs in the supply voltage it affects the speed of induction motor. To control the flow of dye even under voltage sag conditions, the variable boost QZSIMC with fuzzy controller has been proposed. In this paper a variable boost capability of the QZSIMC has been tested and analyzed for different voltage sag conditions. Fig. 1 shows the voltage fed QZSIMC fed induction motor coupled to dye pump. The topology of QZSIMC has six parts. It has filter, QZSN, rectifier, inverter, induction motor and dye pump. The PI controller or Fuzzy logic controller determines the shoot through duty ratio D of QZSN and rectifier side modulation index m r . Inverter side modulation index m of the SVM is controlled with the vector controller. To obtain a controllable input power factor, Space Vector Modulation (SVM) technique is required which modulates the rectifier. At the same time, the output voltage fed SVM is applied to the inverter to modulate three-phase output voltage.
Fig. 2 shows the storage tank of dye, pump connected to the outlet of the tank and the induction motor coupled to the pump. The dye is transferred from the storage tank and mixed with pulp. The mixture is transferred to the head box of the paper machine for the manufacturing of paper. The selected
EXISTING SYSTEM:
The most generally utilized AC-AC converter topology in the industry is a traditional DC link voltage source Converter. DC link capacitor makes the traditional B2BC bulky and limits service lifetime. Gyugi and Pelly have introduced the AC-AC converter without DC link component with forced commutated Cyclo-converter. In 1980, Venturing and Alesina introduced the Matrix Converter (MC) and they provided the comprehensive mathematical background. The most impressive alternative to MC is the B2BC due to its high power density, bi-directional flow of power, reduced harmonics with sinusoidal waveforms, lower volume and weight, unity power factor, extended lifetime and dependable in hostile conditions. Dual topologies of MC are Direct Matrix Converter (DMC) and Indirect Matrix Converter (IMC). DMC perform single stage conversion (AC-AC), while the IMC performs two stage conversions (AC-DC-AC) without DC link capacitor. Even though both converters have same characteristics, the DMC operates with complex commutation, while IMC has easy commutation similar to B2BC. Although many researchers have made significant process, penetration of MC in industry is less because of its limitations. Like the B2BC, MC has limited voltage transfer ratio as 0.866. MC cannot have short circuit the source and open circuit the load. Much research was carried out to increase the voltage transfer ratio. Effortless method is to connect a transformer between the supply and the load. But then again bulky transformer affects its compactness of the MC. Another way is to make the MC to operate in over modulation region. However, in this process voltage transfer ratio can be increased up to unity. Pawel Szcaesniak has proposed matrix resonant frequency converter which made the voltage transfer ratio greater than unity. But, in this method synchronization of MC and resonant source makes control of matrix resonant frequency converter complex.
CONCLUSION
In this paper, based on the fuzzy logic controller, a variable shoot through duty ratio has been proposed for Quasi-ZSource Indirect Matrix Converter fed induction controlling the Dye pump and it has been compared with PI controller. Analysis for RMSE,ITSE and ITAE were made for speed response of PI controller and fuzzy controller for different voltage sag condition. Simulation results indicate the proposed fuzzy controller has better speed response than PI controller. Positive results were achieved in both simulation and experimental setup for 20%, 40% and 60% voltage sag. The evaluation of percentage flow error in flow of dye was done with the proposed fuzzy based Quasi-Z-Source Indirect Matrix Converter. The results shows that for 20%,40% and 60% voltage sag the percentage flow error is within the limit.
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