Simulation of AC/DC/AC converter fed RLC series circuit with asynchronous generator using Mat lab/Simulink

Abstract: Artificial Network used to measure conducted emission noise on the DC side due to the use of photovoltaic inverters (DC-AN) has been characterized based on impedance and insertion loss using analytical method. Impedance and insertion loss compatibility requirements are regulated by CISPR standard 16-1-2:2014 to provide matching impedance with DC source and Equipment Under Test (EUT) in the radio frequency range from 150 kHz to 30 MHz. Circuit analysis using node analysis and loop analysis in the form of Laplace Transform is used to obtain the frequency response equations of impedance and insertion loss. Furthermore, the verification of the analytical method results is done by comparing it with the simulation method and the proposed DC-AN design based on analytical method has been made to validate DC-AN characteristic required by the standard. Finally, it could be concluded that the characteristics of DC-AN with analytical method are very close to the results of simulation method and the characteristic of the proposed DC-AN design is still within the tolerance limits allowed by the standard, which is ± 20% of the required impedance exact value and it has an insertion loss around of below -40 dB so it could be used to measure conducted emission noise.

Abstract: A novel active power factor correction method for power supplies with three-phase front-end diode rectifiers is proposed and analyzed. The implementation of this method requires the use of an additional single switch boost chopper. The combined front-end converter draws sinusoidal AC currents from the AC source with nearly unity input power factor while operating at a fixed switching frequency. It is shown that when the active input power factor correction stage is also used to regulate the converter DC bus voltage, the converter performance can improve substantially in comparison with the conventional three-phase AC-to-DC converters. These improvements include component count reduction, simplified input synchronization logic requirements, and smaller filter refractive components. Theoretical results are verified experimentally. The proposed method has the disadvantage of substantially increasing the current stresses of the switching devices and the high-frequency ripple content of the prefiltered AC input currents. >

Abstract: This paper reviews progress in topology, control, and design aspects in three-phase power-factor correction (PFC) techniques. Different switching rectifier topologies are presented for various applications. Representative soft-switching schemes, including zero-voltage and zero-current switched pulsewidth modulated (PWM) techniques, are investigated. Merits and limitations of these techniques are discussed and illustrated by experimental results obtained on prototype converters. Control and input filter design issues are also discussed.

Abstract: This paper presents an analysis and design of an electronic load controller (ELC) for three-phase self-excited induction generators (SEIGs) suitable for stand-alone pico-hydro power generation with constant input power. Here, the SEIG can be used to generate constant voltage and frequency if the electrical load is maintained constant at its terminals. Moreover, under such operation, SEIG requires constant capacitance for excitation resulting in a fixed-point operation. For this purpose, a suitable control scheme has to be developed such that the load on the SEIG remains constant despite change in the consumer load. In such applications, water is freely available and, hence, a simple and cheap controller has to be developed, which can operate almost unattended in remote and hilly regions. The proposed ELC consists of an uncontrolled rectifier and chopper with a series "dump" load. Proper design of rectifier, chopper, and dump load is very important for troublefree operation of ELC. In this paper, an analysis along with a design procedure for computing the rating of various components of ELC is presented for a range of SEIGs.

Abstract: A capacitor-excited induction generator used with a hydraulic turbine in a stand-alone generating system can provide a high quality voltage and frequency control not matched by other small generating units. This is achieved without a turbine governor by using a controllable additional impedance on the load side. The control is achieved using a static converter. The analysis of the system and the design of the power and control system are presented. Measurements from an experimental unit are provided to verify the predicted performance.

Abstract: This paper presents a transient analysis of a self-excited induction generator (SEIG) with electronic load controller (ELC) used in stand-alone micro-hydro power generation employing uncontrolled turbines. In view of the need to feed both dynamic [three-phase induction motor (IM)] and static loads from such systems, the transient behavior due to switching in of such loads is of interest and is carried out here. A composite mathematical model of the total system has been developed by combining the modeling of prime mover, SEIG, ELC, and load. Simulated results are compared with the experimental ones, obtained on a developed prototype of an SEIG-ELC system for the starting of an IM and switching in a resistive load. For the starting of an IM, a star/delta starter is used to avoid inrush current. Harmonic analysis is carried out to find total harmonic distortion of the terminal voltage and current to assess its power quality.