Simulation model of 3-phase PWM rectifier by using MATLAB/Simulink

Many industrial applications require the use of power electronic devices, which in turn help in overcoming the problems of variable load and fluctuations that occur at the end of feeding. The current study emphasizes that the use of different electric power generation systems with industrial applications needs control devices to work on improving the power quality and performance of systems in which there is an imbalance in the voltage or current due to the change of loads or feeding from the source. The present study also presents a model of a transformer widely used in industrial applications and this work includes simulating a three-phase rectifier by MATLAB. There are four cases in this work HWR (uncontrolled and controlled) and FWR (uncontrolled and uncontrolled) with different loads (R, RL & RC) including full wave type AC/DC using six electronic transformer silicon control rectifier (SCRs) once as well as unified half wave using three electronic transformer silicon control rectifier (SCRs). Simulation results include input, output voltage, and current with the waveform.

On electric power generation issues in ship electric propulsion systems

Object and purpose of research. The object and purpose of this study is generation of electric power for electric propulsion of ship and vessels; methods and problems, state-of-the-art and trend analysis are presented. Materials and methods. The main principles and methods of electric power generation using various generating and power conversion systems are briefly discussed. Their advantages and disadvantages are identified based on publication in this field. Main results. Achievements in the modern methods of power generation for ships, as well as ways of its transformation are highlighted. A detailed analysis of the state-of-the-art and trends in ship electric power generation is given. Various options of engines and generators are considered, including advanced types. Their characteristics are thoroughly analyzed based on the international publications. Conclusion. Conclusions are formulated regarding achievements and current problems in ship electric power generation systems.

PLL wrap function for synchronization in phase jump disturbances

Synchrony plays a major role in the interconnection process between local electric power generation systems and the electrical grid. Grid phase disturbances prevent the generation system from maintaining synchrony. Therefore, an efficient phase tracking method is necessary in order to detect phase jumps and abrupt changes in amplitude. In this paper, we propose a software-designed method to strengthen phase tracking based on the wrap process of a second-level Phase Locked Loop (PLL). The term ‘wrap’ means establishing the phase values of the reference signal in intervals of π to match it with the values obtained from the PLL output (sync pulse). To quantify phase error, a mathematical transformation of the time domain to the frequency domain is implemented. The validity of the proposed wrap function is verified using electrical disturbances.

Non-Salient Brushless Synchronous Generator Main Exciter Design for More Electric Aircraft

This paper presents a prototype of high speed brushless synchronous generators (BSG) design for the application in autonomous electric power generation systems (e.g., airplane power grid). Commonly used salient pole field of the main generator part of BSG was replaced with a prototype non-salient pole field. The main objective of the research is an investigation into the advantages and disadvantages of a cylindrical field of the main generator part of BSG over the original salient pole field. The design process of the prototype generator is presented with a focus on the electromagnetic and mechanical finite element method (FEM) analysis. The measurements of prototype and commercial BSG were conducted for the nominal speed of 8 krpm. The advantages and disadvantages of the proposed solution were established based on measurements in load and no-load conditions.