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Power electronics is the processing of electrical power using electronic devices. Switching converters are the key elements. In a dc-dc converter, the dc input voltage is converted to a dc output voltage having a larger or smaller magnitude, possibly with opposite polarity. The buck converter reduces the dc voltage, using switches, inductors and capacitors. The integer-order model of buck converter...
In this paper, a new robust sliding mode current controller is proposed for fourth order dc-dc converters in continuous conduction mode. The main purpose of controller is to regulate output voltage under load and input voltage variations. Advantage of proposed sliding surface is that it needs only one current sensor to sense inductor current. Converters included in this paper are zeta, cuk and single-ended...
Power factor correction (PFC) converters possess high complexities due to the introduction of the series connections among power converters, which adversely affects the stability of the PFC system. On the assumption that the input voltage can be replaced by its RMS value, and the frequencies of the inductor current and the output voltage of PFC primary converter are much lower than the switching frequency...
Screamer was developed to solve a wide range circuits with a focus on pulsed-power systems. Screamer is a highly optimized code written in Fortran 77. We will describe the mathematical foundations of Screamer and show how Screamer uses a wide range of pulsed power circuit elements. Screamer incorporates many physics-based models such as lossy transmission lines, dynamic loads, gas switching, water...
A dynamic model of Photo-Voltaic (PV) solar module is important when it is utilized in conjunction with switching circuits and in grid connected applications. In this paper, a fractional-order dynamical model of a PV source is introduced. The model includes both a fractional series inductor and a parallel capacitor which are in general of two different orders allowing for extra degrees of modeling...
A mathematical model of the three-phase electrical load intended to calculate the modes of electric grids with controlled arc extinguish reactors considering the asymmetry parameters of overhead lines. When developing the model the assumption was made that normal mode of power load is constant. It makes possible to minimize the set of input data. The load current equations are derived from a combination...
This paper presents a DC-DC current buck converter through duality approach and its DC transformer modelling for current based loads. Buck converters are predominant parts in switched mode power supply (SMPS). These converters are attached after rectifiers at output end to control output quantity. There are some applications in which current source is available and there is need of output current...
State-space average value modeling of dc-dc converters in continuous and discontinuous modes have been conferred remarkable recognition in the literature. This paper presents different aspects of averaged value modeling of flyback converter operating in discontinuous conduction mode (DCM). Moreover, a second order sliding mode controller is designed and analyzed for flyback converter. The advantages...
This paper presents a technique on how two simulators at different levels of abstraction can interact for the design and sizing of a booster power unit. The system is constituted by an ultracapacitor bank and a converter to boost voltage sags in a railway application. Full steps to determine Thevenin equivalent circuit of a dc railway is obtained based on exact modeling of the system components. Example...
The phasor-PWM-based current source inverter (CSI) is a boost inverter. The difference between conventional CSIs and the boost inverter is that the boost ratio $(V_{\rm LLrms}/V_{\rm dc} ) $ in the boost inverter can easily be above 3.0, whereas this ratio is around 1 in conventional CSIs. In order to realize the potential capabilities of the boost inverter and to assist its penetration into renewable...
This paper presents the derivation of the small-signal model of the boost converter operating in the boundary-conduction mode (BCM) using the circuit averaging technique. The essential transfer functions such as the input-to-output voltage transfer function Mv and the control-to-output transfer function Tp are derived using the linear small-signal model. Further, the characteristics of these transfer...
This research presents an optimal design of a phase shift full bridge (PSFB) converter with a proposed constant power (CP) charge mode for capacitor charging power supply (CCPS). Three pieces of PSFB transformer are connected in series at the output to overcome the high voltage stress for each component as well as in parallel at the input for sharing the large current. The proposed converter is designed...
A simple dynamic model of a nuclear reactor with temperature dependent reactivity and six groups of neutron emitting nuclei is developed in this paper based on first engineering principles. The proposed model contains the possible minimal number of differential equations and it is capable of describing important dynamic phenomena such as load change transients between day and night periods. Because...
The Cuk converter being fourth-order non-linear non-smooth with non-minimum phase dynamical system imposes complexity in the analysis and control system design. In this paper, a state-feedback control strategy along with feed-forward control based model is designed. The resulting close-loop dc-dc converter exhibits good output voltage regulation even in presence of step and high frequency perturbations...
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...
This paper presents a time-efficient modeling and simulation strategy for aggregated microinverters in large-scale simulations, with a 20-panel system used as an example. As the microinverter configuration emerges to overcome reliability and loss mismatch issues in centralized PV inverters, a model that can be used for rapid prototyping is required. This model is also helpful in predicting behaviors...
Boost converter circuit is widely used as DC-DC converter in the photovoltaic system applications but they are time variant and periodic in nature because of its switching operations. In this paper small signal state-space averaging technique is used for modeling of the DC-DC boost converter as a time invariant system by using set of differential equations that can represent the system working during...
This paper proposes a large signal model for generic DC/DC converters that copes with both CCM and DCM modes. In the model, both the peak and the valley current of the inductor are also modeled. The mode change is detected dynamically by sensing the zero crossing of the valley current. The peak value needs some specific detection system to avoid mismatches during large transients. Voltage and current...
This paper proposes and derives a general-formed average model for three-phase voltage source inverters (VSIs) that is suitable to implement modular simulations. During deriving the switching model, the inverter is divided into several units according to their functions. Every unit is maintained in the switching model, where the units are interfaced only by independent inductor currents and independent...
This paper presents the design and simulation of a DC-DC boost converter which uses solar system as input source. In general, solar is one of renewable energy sources which is sustainable and free if compared to other alternative energy. The voltage of solar system can produce a maximum voltage up to 16V during daylight and it is compatible enough with DC-DC boost converter system to charge batteries...
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