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The purpose of reconfiguration process in PV systems is to find the connection structure of the highest amount of power obtained by the system under partial shading conditions. In this paper, a new genetic-algorithm based approach was presented for the reconfiguration. The system tries to maximize the obtained power in the same sub-module combining the ones that have the most approximate radiation...
Wind turbine with proportion of its design and control concept, can produce electricity in different actual mode. This enables turbine to show a certain reaction in different faults. This operation, can be analyze and provide a suitable plan for construct, and also add to turbine control mechanism as necessity. The main goal of this paper is analyzing the stability of a fixed-speed wind turbine during...
Lithium-ion polymer batteries are getting popular in both renewable energy systems and electric vehicles thanks to their high power and energy density. Therefore, accurate battery models are vital in design and simulation of hybrid/electric vehicle propulsion systems. In this work a novel equivalent circuit-mathematical battery model whose parameters were extracted from experimental data is proposed...
In this research, a novel intelligent charger with battery diagnosis function is proposed. The diagnosis function is implemented by way of impedance spectroscopy achieved by controlling the charger to create a frequency swept excitation voltage at the battery terminals with no additional hardware. The impedance variation of battery according to the degradation over the life is measured and used for...
There are circulating currents among the parallel inverters. Based on the existing researches on circulating currents, an accurate model of switching frequency circulating current is proposed in this paper. Moreover, the relationships between the circuit parameters and switching frequency circulating current are investigated and analyzed in detail. Based on the analytical results, favorable design...
This paper presents the nonlinear lookup table model for synchronous generator (SG) analysis. The saturation effects of the SG magnetic circuit have been considered. The saturated characteristic of the SG magnetic circuit are based on the open circuit saturation curve for magnetizing inductances. The model has been implemented into the Synopsys/Saber software using the MAST modelling language. To...
In this paper it is described a research project concerning the derivation and the development of a novel foward-facing hybrid vehicle simulation tool based on Multiphysics lumped circuit approach. Sub-components are modelled as multi-port systems. Each port is characterized by means of an intensive and an extensive quantity complementary in power. This approach allow to model the mutual influence...
Decrease in state of health (SoH) of a battery is a measure of end of battery life. Also available battery capacity is dependent on battery life either. Thus accurate estimation of SoH and cycle number of a battery are very important. In this study a method was proposed in order to estimate battery cycle number using ECE 15 driving cycle. Also another method to obtain SoH of a battery using the cycle...
Modeling the discharge characteristics of every cell in a battery pack individually is the basic issue for battery management systems (BMS). This paper proposes a simple method for modeling the constant current discharge curves with POD. With this method, precise model of a cell can be built with typical discharge curves, and characteristics of other cells can be estimated. This method can also be...
This paper provides a quantitative analysis on the energy efficiencies of the battery-ultracapacitor hybrid energy storage system and the lithium-ion-battery-only system under the JC08 driving cycle. There are two control parameters selected in the analysis, the efficiency of the DC-DC converter and the internal resistance of the battery pack. The analysis shows that compared to the battery-only system...
This paper proposes a theoretical study supporting the use of simplified single-diode photovoltaic (PV) models to accurately reproduce the behaviour of PV generators. In particular, a newly defined parameter is introduced, which allows to classify PV modules according to the possibility to neglect either the series- or the shunt resistance in the circuit model. On such a basis, equations allowing...
In this paper an attempt has been made to realize the solar photovoltaic (PV) characteristics and its control through solar array simulation system designed using field programmable gate array (FPGA) with hardware co-simulation. This facilitates the virtual test bench to test the I-V and P-V characteristics of the solar PV module and performance of the maximum power point tracking (MPPT) algorithm...
Different types of photovoltaic (PV) cell technologies have been commercially used for various applications. These cell technologies can be categorized as multi-crystalline, mono-crystalline and thin film. Due to the differences in PV cell technologies, a single PV model is unable to model all the output characteristics. The single and double diode PV models have been widely used for modeling the...
Smart appliances and smart gateways (between private households and energy providers) are a hot topic, due to the promises of more convenience, more energy saving, less cost. This paper focuses on the impact of such devices on the load of networks, i.e. the view of energy providers. This is achieved by implementation of a simulator framework for sets of households (arranged in big buildings or even...
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