Industrial Electronics
Saeid Moosavi
Abstract
DC–DC boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. A high step-up DC-DC converter based on the modified SEPIC converter is presented in this paper. Step ...
Read More
DC–DC boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. A high step-up DC-DC converter based on the modified SEPIC converter is presented in this paper. Step up non-isolated converters generally suffer from problems such as high voltage stress and low efficiency. In this study, non-isolated boost converter structures, SEPIC, SEPIC modified circuit, and a proposed converter is studied. Then compare the performance of these typologies is located and presented as a chart. The operation analysis, design procedure for proposed converter is obtaied from 15V input voltage and 150V output voltage and with 100 watts output power. Using the proposed converter, the input inrush current and the invading voltage of the output have decreased. The time response analysis states that the proposed converter acts faster with deployment time than other converters.
Industrial Electronics
Nasrin Noroozi; Hossein Gholizade Narm
Abstract
This paper presents a simple and direct power control approach to control a single-phase grid-connected boost inverter (GCBI) for renewable energy applications. A DC voltage source and a single-phase single-stage boost inverter that is connected to the grid by an L filter form the power injection system ...
Read More
This paper presents a simple and direct power control approach to control a single-phase grid-connected boost inverter (GCBI) for renewable energy applications. A DC voltage source and a single-phase single-stage boost inverter that is connected to the grid by an L filter form the power injection system (PIS). Unlike the conventional voltage source inverters (VSIs), the boost inverter can generate an AC output voltage with amplitude larger than the DC input one, only in a single stage. In comparison with multi-stage power conversion systems, the aforementioned inverter has less number of devices and components which results in low cost and higher efficiency. Nevertheless, the boost inverter suffers from undesirable dynamic behavior and extreme fluctuation response that makes it difficult to control. Thus, the proposed power injection control system consists of two parts. First, a proper state-feedback control scheme is designed to increase damping and also improve the stability of the closed-loop system. Then, the direct power control strategy is employed to control and track the desired powers that should be injected into the grid. Simulation results are presented to validate the effectiveness of the proposed control strategy.
Industrial Electronics
Farzad Sedaghati; Naser Hashemipour
Abstract
This paper proposes a multilevel inverter that produces many steps in output voltage using fewer power electronic switches. The configuration of the proposed inverter is modular and extendable. The suggested topology consists of a combination of series-connected switching units and a conventional H-bridge ...
Read More
This paper proposes a multilevel inverter that produces many steps in output voltage using fewer power electronic switches. The configuration of the proposed inverter is modular and extendable. The suggested topology consists of a combination of series-connected switching units and a conventional H-bridge converter. The presented multilevel inverter is analyzed in both symmetric and asymmetric configurations. Two different methods to determine the size of DC voltage sources of the asymmetric configurations are presented to achieve the maximum steps in the output voltage. The characteristics of both symmetric and asymmetric configurations are given and compared together in detail. {#R1-2}The comparison results show that the asymmetric configuration with second design method uses less power switches and has less power losses than symmetric and first design method asymmetric configurations. However, it has more (Total Voltage Rating) TVR than two others. The comparison between symmetric configuration of the proposed multilevel inverter and four similar multilevel inverters shows that the proposed inverter uses fewer power switches and has less power losses. Finally, a laboratory prototype of the multilevel inverter is implemented and the experimental measurement results are given. The experimental measurement results validate proper operation of the proposed multilevel inverter.
Industrial Electronics
Mahdi Heidari
Abstract
The power generation from wind turbine are variable because of dependence on environmental conditions and it is important to extract maximum energy from wind. This paper proposes a new method to extract maximum energy from wind turbine systems. The artificial neural network (ANN) is used to estimate ...
Read More
The power generation from wind turbine are variable because of dependence on environmental conditions and it is important to extract maximum energy from wind. This paper proposes a new method to extract maximum energy from wind turbine systems. The artificial neural network (ANN) is used to estimate the wind speed based on the rotor speed and the output power. In addition to ANN, a predictive controller is used to maximize the efficiency of the boost converter. In predictive controller, duty cycle of boost converter is controlled to obtain the maximum power point based on the slope method. One of the most interesting advantages of this controller is simplicity of control and implementation that is leads to fast response and exact tracking. The method has been developed and analyzed by utilizing a turbine directly driven permanent-magnet synchronous generator (PMSG). The simulation results verify the performance of the proposed method. Results show that this method maximizes wind energy extraction with more accuracy and fastness.
Industrial Electronics
Hossein Shojaeian; Saeed Hasanzadeh; Mojtaba Heydari
Abstract
AbstractThis paper proposes a novel high step-up converter suitable for distributed generation using renewable power sources. The proposed converter includes a dual switches structure, two voltage multiplier cells and a three-windings coupled inductor for achieving high voltage gain. The configuration ...
Read More
AbstractThis paper proposes a novel high step-up converter suitable for distributed generation using renewable power sources. The proposed converter includes a dual switches structure, two voltage multiplier cells and a three-windings coupled inductor for achieving high voltage gain. The configuration of the proposed converter not only reduces the voltage and current stresses of the switches, but also restricts the input source current, which reduces transmission losses and increases the lifetime of the input source. In the proposed converter, the multiplier cells are charged during the switch-on and switch-off periods, which cause to enhance the voltage gain of the converter and improve its productivity. Another feature of the proposed converter is that the inductive leakage energy of the coupled inductor is recycled through a passive clamping circuit which, in turn, has a considerable impact on system efficiency. A comparison is conducted between the performance of the proposed converter and the counterpart converters to demonstrate the proposed converter’s superiority in terms of voltage gain, voltage stress across the switches and diodes and number of components. Theoretical analysis and simulation results are provided to demonstrate the authenticity of the proposed converter.
Industrial Electronics
Ahmad Khajeh; Zahra Shabani
Abstract
The Doubly-Fed Induction Generators (DFIG) based Wind Turbines (WT) are widely used in WTs connected to power systems. Traditionally the back-to-back converters are used in order to control the DFIG. In this paper, an Indirect Matrix Converter (IMC) is utilized. Compared with back-to-back converters, ...
Read More
The Doubly-Fed Induction Generators (DFIG) based Wind Turbines (WT) are widely used in WTs connected to power systems. Traditionally the back-to-back converters are used in order to control the DFIG. In this paper, an Indirect Matrix Converter (IMC) is utilized. Compared with back-to-back converters, IMCs have numerous advantages such as: higher level of robustness, reliability, reduced size and weight due to the absence of bulky electrolytic capacitor. According to the recent grid codes it is required that wind turbines remain connected to the grid during grid faults. It means that the plant must be in operation and be able to tolerate the fault conditions. This feature is called Fault Ride-Through (FRT) capability of wind plants. To improve FRT capability of the wind turbine, in this paper an adaptive gain scheduling controller is proposed. The proposed method could increase the damping of fault currents and hence attribute more time to controller for reactive power injection. Therefore, the new FRT standards are satisfied. PSIM simulation results confirm the efficiency of the proposed method.
Industrial Electronics
Hassan Moradi CheshmehBeigi; Alireza Mohamadi
Abstract
This paper presents a new and improved Torque Sharing Function (TSF) to minimize torque ripple of Switched Reluctance Motor (SRM). This approach combined of three steps. At first step, Genetic Algorithm has been used to define the best Turn-on and Turn-off angel of phase current. At second step, a fuzzy ...
Read More
This paper presents a new and improved Torque Sharing Function (TSF) to minimize torque ripple of Switched Reluctance Motor (SRM). This approach combined of three steps. At first step, Genetic Algorithm has been used to define the best Turn-on and Turn-off angel of phase current. At second step, a fuzzy logic controller system has been designed as a new TSF. Finally, at the last step, Particle Swarm Optimization (PSO) has been used to optimize Fuzzy membership function. The two main merits of this approach are that the proposed control algorithm can be used in wide speed ranges and also three-step-design and optimization makes this approach enable to perfectly results in smooth torque. The effectiveness of this approach has been verified through a simulation of four phase 8/6 SRM in Matlab/Simulink. Obtained result from simulation shown that the produced torque was high quality and its ripple was one-third of fuzzy TSF. This proposed method is very powerful to adapt itself for various kind of SRMs with different parameters.
