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The lap-top computer uses switched-mode power supply as a standard power source for supplying very low voltages (around 1V). The Multi-phase Buck is widely used in Voltage Regulator Modules (VRM) design because of its low cost and simplicity. But this topology has the drawbacks of narrow duty cycles when it operates at higher switching frequencies. The objective of this paper is to verify Quadratic...
Application of static synchronous series compensator (SSSC) based damping controller for enhancement of power system stability is throughout investigated in this paper. SSSC is effectively utilized for power flow control in the power system. A SSSC-based damping controller is proposed for rotor angle stability enhancement and to eliminate the power oscillation damping in power system. To improve the...
❑ Context: DC railway vehicles are subjected to surge transients specific to the traction system environment. ❑ Transient Event Specifications: • Standards. • Transit authorities may specify their own requirements. • Each project requires custom design. ❑ Vehicle Manufacturers Main Task: • Demonstrate during the qualification testing phase the performance of both the equipment and the overall system...
An LC3L type Isolated bidirectional dc/dc converter is analyzed, including the effect of a high frequency transformer by using ac complex circuit approximation. Its solution is derived and is used to obtain the characteristics of the proposed converter. The analyses show the comparison of voltage gain with T-equivalent transformer results in introduction of magnetizing and leakage inductance at conventional...
In two-level PWM rectifiers, two common control strategies are respectively VOC (Voltage Oriented Control) and DPC (Direct Power Control). In high power applications, the converter performance may suffer seriously from the non-ideal characteristics of the sampling and control system. The effects of the non-ideal characteristics will be analyzed in this paper for classic VOC, DPC and PDPC (Predictive...
Metal-oxide resistive random access memories with a single memristor device at the crosspoint (1R RRAM) is a promising alternative to next generation storage technology due to their high density, scalability, non-volatility and low power consumption. However, the imperfect fabrication process introduces high defect rates of the nanoscale memristor devices and leads to yield degradation. In addition,...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
Switch mode power supplies generated a wide range of conductive and inductive interference. Moreover, the spectrum dominated by discrete components with a switching frequency of a power transistor and its harmonics. To ensure the electromagnetic compatibility of devices necessary to reduce the amplitude of these spectral components. In this paper the questions of usage of spread spectrum technology...
In order to regulate the output voltage in converter system with four-quadrant characteristic a quasi-Z-Source Converter (qZSC) is preferred. The converter can provide bi-directional current and bipolar output voltage with minimal number of elements. In this converter two active switches with complimentary commands and a quasi-Z-source network is required and there is no need to coupled inductors...
Based on the analysis of the turbine generator system, steam turbine and its speed governor system, synchronous generator and its excitation controller and load model of turbine generator system are modeled mathematically. Then, the model of turbine generator system is simulated in Matlab/Simulink, the model of turbine generator system can conclude characteristics curves that are similar with actual...
This paper deals with vector control of grid-connected converter under unbalance grid conditions using single AC side current sensor. DDSRF based decoupling technique is used for decoupling of grid voltage and enhanced DDSRF is used for decoupling of grid current in the revolving d+−q+ and d−−q− frames. In the presented method, the stationary α-axis current is simply proportional to sensed r-phase...
Power Electronic Transformer(PET) is a promising component in the future power system. The PET can offer not only the functions of conventional low frequency transformer, but also many additional functions. Among all the additional functions, the reactive power control function is considered one of the most important one. This paper is discussing the application of reactive power control function...
A microgrid (MG) is a cluster of loads and distributed generation units (DG) that are located in a close distance from each other. In a dc MG, the DGs generate a dc voltage and the loads consume power while supplied by a dc voltage. The power sharing amongst DGs is one of the main control issues in dc MGs. Power sharing is conducted in either form of load current or power sharing; however, many of...
This paper proposes a new seamless operation scheme for a stand-alone power system, which has a battery energy storage system (BESS), photo voltaic (PV) panels, and an engine generator (EG) to supply electric power to the customers in remote islands. The proposed scheme offers smooth operation change of the BESS from the current control to the voltage control or vice versa when the EG is connected...
Modulation techniques for the modular multilevel converter consider that the total number of sub-modules in the phase-leg is, either instantaneously or on average, equal to N balancing the capacitor voltages to a constant reference. This paper proposes an offset PWM technique that utilises the total number of the SMs in the arms of the MMC, particularly under low modulation indices. The result is...
In order to improve the robustness of the control for Permanent Magnet Synchronous Generator (PMSG), the optimal linear quadratic regulator technique is adopted to both current and voltage controllers in this paper. Furthermore, an integral action is added to cancel the steady-state error. Control principles are analyzed and controller design is given in details. Simulation results reveal that the...
This paper first introduces an existing circulating current controller for modular multilevel converter (MMC) through redundant voltage levels with detailed analysis for the controlled circulating current. To further reduce the peak-to-peak value of the circulating current at switching frequency and decrease the total control error, a fixed-band redundant state transition principle is put forward...
This paper presents an improvement in the harmonics compensation performance of a previously proposed smart charger (SC) with a constant dc-capacitor voltage-control (CDCVC)-based strategy for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs). A current controller of a three-leg pulse-width modulated rectifier with proportional-integral (PI) controllers in d-q coordinates...
A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for floating gate driver. In addition, the voltage stress of one of the switches is lower than the existing quadratic...
This paper introduces analysis for the performance of voltage source inverter fed from wind energy system. The inverter is used to control the voltage and frequency of an induction motor, so that its speed can be controlled. A self-excited induction generator is used to convert mechanical energy to electrical energy, as it has many advantages in terms of ease of maintenance, self-protection against...
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