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Buck converters are the most popular converters used in the consumer electronic industry today. Synchronous buck converters are becoming the industry standard because of their higher efficiency and superior performance. Modeling and simulation of the synchronous buck converter is carried out in this paper. The open-loop and closed-loop converters are simulated to show the effectiveness of the simple...
Bidirectional dc-dc converters are widely used in applications requiring bidirectional power flow. Control of these converters in a more suitable way and modeling and analyzing of them in a simpler method is still a research topic. In this paper different small signal modeling methods for bidirectional dc-dc converters are compared. Mathematical averaged small signal modeling and ac sweep tool on...
The continuous growing requirements on power relays make it necessary to handle higher switching capacities which are represented in an increasing number of switching operations resulting in a demand for an extended lifetime of the relays. Especially by switching direct currents a directed material transfer which is limiting the lifetime can occur. Source voltage from battery systems (e.g. automotive)...
Modelling of a voltage source inverter based DVR is presented in this paper. Two mathematical functions are proposed to benefit the design of controller and for simulation work; preparation for quick simulation instead of using physical models. An averaging operator is applied to the switching model of the inverter, and then the averaged functions are all perturbed using linearization technique. The...
The tapped-inductor buck (TI-buck) converter has shown to be a suitable solution for auxiliary power supply for modular multilevel converter submodules. Such application features a large step-down voltage conversion, made at relatively low output power. This converter operates in discontinuous conduction mode with zero voltage switching of the high-voltage valve. This paper treats the dynamic behaviour...
In this paper, a complete simulation setup for AC motor drives which is suitable for automotive purposes is proposed. The simulation model of the whole motor drive including the motor, inverter drive and primary supply is implemented in MATLAB/Simulink environment. The proposed simulation setup is a well-suited tool for system sizing and control algorithm design. System performances can be evaluated...
Frequency regulation is central to the successful operation of remote wind-diesel powered electrical grids. Use of secondary or “dump” loads are necessary to allow instantaneous wind generation to exceed grid demand. The present study investigates the feasibility of using a network of Electric Thermal Storage (ETS) units without centralized control as an effective secondary load. Individual ETS units...
This paper proposes a model predictive control (MPC) strategy for a nested neutral point clamped (NNPC) converter. The NNPC converter is a four-level topology that is very attractive for medium-voltage (MV) applications. This is because it has less number of components in compare to other classic four-level topologies. In this paper, the MPC strategy is developed for the NNPC converter to control...
The double saliency and high saturation levels in switched reluctance machines (SRM) pose difficulties in modeling and analyzing the machines. Current distortions due to less model fidelity or machine drive current controls result in variations in simulation accuracy. This paper introduces coupled SRM drive modeling and simulation process that takes account for the machine, drive and loads characteristics...
In literature three phase voltage source inverter models are based on one specific application considering only a limited number of switching state combinations and assuming certain load properties. This paper suggests a model considering all practical switching state combinations. Time dependent load behavior is also included in the model.
This paper presents a novel average voltage estimation model of a Voltage Source Inverter (VSI) for Permanent Magnet Synchronous Generator (PMSG) drive systems which when included in a complete electromechanical system model results in significantly reduced simulation times. Sinusoidal Pulse Width Modulation (PWM) control techniques are implemented with the proposed model enabling effective control...
The paper presents a Mixed Integer Linear Programming (MILP) model for the solution of the three-phase volt/var optimization (WO) of medium voltage unbalanced distribution feeders. The WO of a distribution feeder is aimed at calculating the most efficient operating conditions by means of the scheduling of transformers equipped with an on-load tap changer and distributed reactive power resources (such...
Modeling of supply interruptions and voltage dips caused by component failures and scheme reconfigurations in an electrical distribution scheme is considered in a Smart Grid scenario. Explicit reference is made to a MV/LV transformer substation supplying an industrial load. The modeling difficulties due to the contemporaneous presence of fast switching actions together with slow repair procedures...
Traditionally, reliability evaluations for substation configurations and distribution networks are performed separately and substation reliability evaluation only focuses on a single substation. This paper presents a technique to assess the reliability of multiple substations with associated distribution networks. Based on Markov modeling, a clustering approach, a linear programming algorithm and...
Using the genetic algorithm to solve the selective harmonic elimination technology optimization method, which can be arbitrary for the choice of initial value, make up for the deficiency of the Newton iterative algorithm, in the absence of specific initial conditions can complete the calculation, therefore there is no need predict the tendency of switch angles in the entire modulation range in advance...
A robust strategy is proposed in this paper to control the aggregate charging power of plug-in electric vehicles (PEVs). The charging flexibility of PEVs provides the intermittent renewable power sources with control authority to cope with load fluctuations caused by the variation of grid-connected PEVs population and their instantaneous power demand. In this paper, we consider an aggregate model...
For a complex system with the working point range changing, large delay and other characteristics, it has a certain degree of difficulty to be controlled. The usage of multi-model to deal with this kind of control system issues is effective. In this paper, we focus on proposing the different conditions using different models and multi-model internal model control method. According to different local...
It is common in transportation systems to have small LC filters connected to constant power loads. That may lead to instabilities. To stabilize the system without increasing its weight and volume, a new control scheme is studied, based on a sliding mode controller. It is applied to a DC-DC boost converter that supplies a constant power load. The stability analysis is done using discrete-time model...
As switching power converters are becoming widespread, the power quality of inverters and active rectifiers is becoming increasingly important. Effective dead time is a major cause of harmonics in the output current of voltage sourced PWM converters. The traditional dead-time compensation methods can only handle high current operating conditions well. Several methods capable of accurately compensating...
Three-phase ac systems can be transferred into dq axis, where stability analysis becomes much simpler. In order to apply the stability criterion in AC system, an equivalent DQ admittance model for the ATRU system has been developed in this paper, based on the ABC impedance model in paper [1]. Compared to the literature work, this model has two better features: (1) it is valid in a wide frequency range,...
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