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The VR-1 reactor is operated by the Czech Technical University in Prague more than 20 years. The reactor is utilized mainly for education and training purposes. Therefore, the Czech Technical University, as a reactor licensee, makes an effort to continuously improve the reactor equipment, instrumentation and the educational and training methodologies. It is the way of providing an effective education...
This paper presents the controller design of paralleled Buck converters using Droop Control to obtain common load sharing for DC Microgrid operation. Proportional Integral (PI) controllers are used to provide nested current and voltage control of the Buck converters. Droop control is applied to obtain load sharing between the paralleled converters. Then, a voltage restoration loop is applied utilizing...
This paper presents interpolation method that play a vital role in transition and control of non linear system presented in [4]. Since many problems may be caused by a not-carefully selected interpolation strategy. Some strategies may for example result in control signal discontinuities or transients during scheduling region transition. For these reason we present other interpolation methods for this...
A transformer-less dual input dual output (DIDO) dc converter is proposed in this paper. This converter finds its application in fields of hybrid power system and hybridization of energy sources for electric vehicles. Supply of the output loads, charging and discharging of the battery / energy storage system can be made from the fuel cells (FC) or photo-voltaic (PV) which are provided as the primary...
The traditional power converters used for PV applications use an inductor to achieve the power conversion which increases the size of the power circuit and efficiency reduces. An inductor less Nx DC-DC voltage magnifier without any magnetic element is presented in this paper. The simulation is performed using MATLAB/Simulink software and results are presented. The result shows that the Nx dc-dc voltage...
In this paper, a method of maintaining high power conversion efficiency across the entire load range of a three-phase micro-inverter is proposed. The proposed control method substantially increases the conversion efficiency at light loads by minimizing switching losses of semiconductor devices as well as core losses of magnetic components. This is accomplished by entering a phase skipping operating...
With exhausting fossil fuels and concerns relating environment degradation the use of renewable sources has become statutory. Solar PV being easily and freely available is propitious for various applications. Thus a standalone PV system with novel control is proposed for dc applications. It consists of DC-DC converters in forward power stage, one for boosting PV voltage and bidirectional interface...
In recent years there has been an increasing demand for closely regulated dc power supply. Most of the power electronic converters used in these power supplies use bridge rectifiers which are nonlinear in nature. The nonlinear loads results in low power factor operation of system along with higher harmonic distortions. For reducing the harmonic distortion and better power factor operation of these...
In photovoltaic (PV) applications, power electronic converters play a vital role in transferring power from source to load. In general, operating voltages of PV arrays are low. To interface them with high voltage DC bus, a high voltage conversion system is needed which is provided by high gain topologies. Moreover, to increase the power density, efficiency of conversion and decrease cost, recent developments...
High pulsed electric field (PEF) can be used effectively in drinking water purification, by applying it across the water sample to be treated. Application of sufficient high PEF guarantees killing of harmful germs and bacteria in the drinking water. In this paper, a new multi-module high voltage pulse generator is proposed. Each module is based on DC-DC boost converter in conjunction with capacitor-diode...
This paper considers near-optimal operation of the Tennessee Eastman (TE) process by using a retrofit self-optimizing control (SOC) approach. Motivated by the factor that most chemical plants in operation have already been equipped with a workable control system for regulatory control, we propose to improve the economic performance by controlling some self-optimizing controlled variables (CVs). Different...
These days inductor current ripple based ‘current mode constant on time (CMCOT)’ control is widely used in voltage regulators (VRs) for its higher light load efficiency, higher bandwidth and simple compensation network. In today's VRs, high load current with very high slew rate is a very common requirement in microprocessor or memory applications. One issue of this ripple based CMCOT control is that,...
Currently, shortage of the water resources is a global issue. Water desalination is a solution that can be used to solve the water shortage problem. Capacitive deionization (CDI) is an effective water desalination method. CDI offers relatively low energy consumptions and low initial costs. This paper improves energy exchange between CDI units used in efficient CDI systems. Traditionally, hysteresis...
Parallel connected multi-modular (M-M) singlephase UPS inverter system is an attractive choice for a reliable and scalable power delivery for critical loads. However, a proper current sharing control technique is required to avoid the inter-modular circulating (IMC) currents without use of any extra power circuit components. The output current of an UPS module is used as load disturbance compensation...
Grid integration with Photo Voltaic (PV) and Battery energy conversion system focusing on two aspects namely (i) multi-functional features of a bidirectional AC-DC converter working as interface between the PV & battery pack and AC grid sytem, (ii) MPPT tracking performance of boost DC-DC converter with less current ripple are presented in this paper. The PV side Boost Converter is controlled...
The authros propose a system of intensive training future NPP personnel. Its introduction can solve this task. The programs and methodological support for the simulation of neutron-physical reactor measurements are designed. Simulation of the technological processes is carried out with the computer and full-scale simulators of nuclear power plants generating units with WWER-1000 water-cooled reactor...
This paper presents fuzzy output tracking control of switching photovoltaic (PV) DC-DC converters. The proposed control ensures good performances and overall large-signal stability of the system over the whole operating space. To do this, we present a model of PV system and a state space model for DC-DC boost converter. Then, we introduce an added integral state of the output tracking error. The resulting...
This paper proposes an average modeling of LED dimming circuit controlled by a indirect sliding mode technique. Circuit and control parameters that affect an LED dimming system's stability are studied. The dimming circuit comprises an output-capacitor less buck converter and strings of LEDs as load. The advantages of this topology are: low-part count and increment of system lifetime. This dimming...
This paper presents a new single inductor Dual Input-Dual Output dc-dc converter for a standalone hybrid energy system. The converter has two unidirectional ports, one bidirectional port for storage element and one output port. The converter operates in dual input-dual output mode, dual input-single output mode and single input-single output mode. Both the input sources can power up the load individually...
This paper present a sliding mode control operating at fixed switching frequency for a three-phase unity power factor rectifier using the vector operation technique. The proposed method allows to find a large-signal converter dynamic model in order to transform a tree-phase system into two decoupled subsystems. With this technique only two sliding-mode controllers are needed and the neutral point...
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