R eferences  M. J. Nasila, “Phase-Locked Loop PulseWidthModulation System”, US Patent US6208216B1 , 2001.  Y. Zheng and C. E. Saavedra, “Pulse width modulator using a phase-locked loop variable phase shifter”, Proc. ISCAS2005 , 2005, pp.3639-3642.  P. Wisartpong, J. Koseeyaporn and P. Wardkein, “PulseWidthModulation Based on Phase Locked Loop”, Proc. ECTI-CON 2008 , 2008, pp.697-700.  P. Wisartpong, R. Punchalard, J. Koseeyaporn and P. Wardkein, “New Modified PLL Application Communication and Its Output Frequency Response Analysis”, Far East
, "Comparison of pulsewidthmodulation methods for a quasi impedance source inverter", 10th International Symposium Topical Problems in the Field of Electrical and Power Engineering, Pärnu, Estonia, January 10-15, 2011. U. Shajith Ali, V. Kamaraj, "Double Carrier PulseWidthModulation Control of Z-Source Inverter," European Journal of Scientific Research Vol.49 No.2 (2011), pp.168-176.
The paper is devoted to half-bridge versatile power modules which can compose various converters. Successful use of such modules is possible if their construction is optimal from the electromagnetic and thermal points of view. The first purpose can be achieved utilizing bus-bars in the system of conductors. This ensures reduction of stray inductance, losses and module dimensions, as well as increase of switching frequency. Calculation of stray inductances is not an easy task which, however, can be successfully done with dedicated Finite Element Method (FEM) calculation software, for example JMAG. It can also be used for thermal calculations. In the given paper this method is applied to the analysis of a novel optimized design of the half-bridge module with concentrated DC-bus capacitors. The benefits of the module are shown with the help of simulation as well as experimentally. It is, however, stated that physical parameters of the module could be improved by splitting the DCbus capacitors. The obtained design is more compact, but, as it was verified by means of simulation, also attractive from other points of view (EMC, voltage spikes, losses etc.). This design, therefore, can be recommended for future research.
The purpose of the article was to present the idea of space vector pulse width modulation (SVPWM) and implementation in Nios II softcore processor. The SVPWM module was described in a classical method in hardware description language both as an independent structure and as an additional component to softcore processor. The available methods were compared, and the experiment was carried out in the laboratory to test implemented SVPWM algorithm using high-speed induction motor.
, vol. 22, no. 2, pp. 706-711, 2007.  Anderson, J.; Peng, F.Z., "Four quasi-Z-Source inverters", in Proc. of IEEE Power Electronics Specialists Conference PESC’2008, pp. 2743-2749, June 15-19, 2008.  F. Z. Peng, “Z-Source inverter”, IEEE Transactions of Industry Applications, vol. 39, no. 2, pp.504-510, 2003.  R. Strzelecki, D. Vinnikov, “Models of the qZ-converters”, Przeglad Elektrotechniczny, 86(6), 80 - 84, 2010.  P. C. Loh, D. M. Vilathgamuwa, Y. S. Lai, G. T. Chua, Y. W. Li, “Pulsewidthmodulation of Z-Source inverter”, IEEE Transactions of Power
This paper presents control and analysis of a split-phase induction motor (SPIM) to drive a centrifugal pumping system. An optimized proportional- integral and derivative (PID) controller, that is capable with a vector closed-loop split-phase induction motor control, is presented and its simulation results are discussed. The fine-tuning procedure is employed for fuzzy PID (FPID) controller parameters in order to sustain the motor speed at the predefined reference values. To assess the performance of the competitive controllers, conventional PID (CPID) and FPID, four operational indices for are suggested for measure the capability of the two controllers. These indices involve individual steady state error (ISSE) for each operating period, total steady state error (TSSE) for overall loading cycle, Individual oscillation index (IOI) and Total oscillation index (TOI), in order to measure the capability of the FPID compared with CPID. The performance of the SPIM accomplished with these performance indices is checked and tested on high and low speed levels. Pulse width modulation (PWM) based simulation studies were employed for SPIM using MATLAB/SIMULINK software. The results show that the overall performance of the SPIM operated with vector control that is tuned by FPID is enhanced compared with CPID.
modular uninterruptable power supply system," Power Electronics and Motion Control Conference (EPE/PEMC), 2010 14th International , vol., no., pp.T13-17,T13-21, 6-8 Sept. 2010 doi: 10.1109/EPEPEMC.2010.5606807  Galkin, I., Burtovoy, S. & Stepanov, A. (2013). Finite Element Analysis of Modular PulseWidthModulation Converters with JAMG Software. Electrical, Control and Communication Engineering, 3(1), pp. 44-51. Retrieved 1 Nov. 2013, from doi:10.2478/ecce-2013-0014  N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications, and
The current measurement is becoming a challenging task in power converters operating at high switching frequencies, moreover traditional control system requires two control loops - first (slow) regulates DC-link voltage, second (fast) controls the shape of current, that all together results in complicated transfer function and long transition periods. The current sensorless control (CSC) allows neglecting the mentioned problems. This research for the first time presents the solution of CSC implementation in single-phase three-level neutral point clamped inverter. Mathematical equations were defined for inductor current peaks and transistor conduction time during discontinuous and continuous conduction modes, as well as major problem of current fitting between different voltage levels (consequently with different current peak-to-peak values) was solved, providing two solutions - pre-fitting and post-fitting trajectories. The verification of our theoretical assumptions and analytical equations was confirmed by the simulation analysis. Challenges of real experiments are discussed in the conclusion.
Single Phase PWM Rectifier in Traction Application
This research has been motivated by industrial demand for single phase PWM rectifier in traction application. This paper presents an advanced control structure design for a single phase PWM rectifier. The PWM rectifier is controlled to consume nearly sinusoidal current with power factor nearing to unity. The control structure consists of a DC-link voltage controller and a current controller implemented by a proportional-resonant controller using a fast phase angle and frequency estimator. The estimation algorithm is derived from the weighted least-squares estimation method. The feasibility of the proposed control structure is confirmed by experimental tests performed on designed laboratory prototype.