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Dynamic Voltage Restorer (DVR), as a device of voltage sag compensation, demands fast transient response, and the disturbance of source voltage is a main impact on control performance. The DVR control strategy based on discrete state space will enhance control bandwidth and stability. However, for the discrete space control system, the number of parameters is relatively more which will lead to a complicated...
In this paper the three-phase cylindrical inductor that heats the ferromagnetic tube to a temperature that is below the magnetic changes was considered. For axisymmetrical formulation of the problem the all components of the electromagnetic field was determined.
In this paper, a kind of networked control of power-sharing for inverter parallel operation is presented. To increase the participation of communication and improve the system performance, both autonomous mode and master-slave of communication mode in networked control are investigated. Nevertheless, communication actions may bring some unpredictable outcome due to the negative factors such as time-delay...
A DC/DC boost converter exhibits highly nonlinear properties and subjects to certain uncertainties, like load change, input voltage variation, and parametric uncertainties. This paper first presents an improved accurate model of the converters, including the parasitic elements and model uncertainties, which are usually existed in actual systems but not (or not sufficiently) considered in most of the...
This paper proposes a Current Deadbeat Control (DBC) algorithm for a three-phase 9-cells qZS based Cascaded H-Bridge (CHB) inverter to ensure grid current supply with low THD. The studied topology is considered as a single-stage DC/AC topology having the capability of boosting the DC input voltage with high-quality multilevel AC voltage, independent DC-link voltage compensation, and control of the...
This paper proposes a digitally controlled bipolar converter for dc micro grids. The bipolar converter configuration is based on the combination of SEPIC and CUK converter with the modifications in both the converters. In the proposed bipolar converter, the equivalent series resistance (ESR) of the transfer floating capacitor is increased by inserting a series resistance in the both SEPIC and CUK...
High-speed models of facilities with AC generators and modular multilevel converters have been developed by using the methodology of system modeling by interconnected subsystems. The method of facility separation on parts by introducing in circuits virtual voltage sources has been implemented. Analysis of operation modes of considered systems was completed. Fast response of models was validated.
An improved deadbeat plus plug-in repetitive control scheme is proposed for grid-connected three-phase four-leg inverters to achieve fast and accurate feed-in grid current tracking. Discrete-time mathematical model of the three-phase four-leg grid-connected inverter is developed. An improved deadbeat (DB) plus plug-in repetitive control (RC) scheme is proposed to reject periodic disturbances while...
Synchronverters are inverters that mimic the behavior of synchronous generators. In this paper, we propose modifications to the synchronverter algorithm to improve its stability and performance. The proposed modifications are implemented in software and do not require any changes in the inverter hardware. The first two modifications concern the control of the virtual field current in the synchronverter...
The paper proposes a new step-up topology with high step-up conversion ratio. Dc analysis is performed and the static characteristics are derived revealing that the static conversion ratio exhibits a high voltage boost, the converter still operating at reasonable duty cycles. Compared to a classical Boost, the static conversion ratio at the same duty cycle D is (1+nD) time higher, where n is the transformer...
With fast growth of data centers and automotive electronics, DC-DC converters are the crucial modules, which deliver power to these systems. High conversion ratio (HCR) step down DC-DC converters are gaining growing attention for usage in these high tech emerging applications. The main design challenge of these converters is maximizing conversion ratio, efficiency, and power density simultaneously...
The adaptive control of thyristor controlled reactor in static VAR compensator (SVC) is suggested. A fast adaptive control method is proposed using an optimal singular adaptive observer and a control signal estimation by the parameters and variables of identification model. The mathematical model of investigated system is created, like is simulated both the control and the executive device.
A five-stage Field-Noyes-Köros model of the Belousov-Zhabotinsky reaction and the corresponding mathematical model of the oregonator is presented. A system of equations for the oregonator steady states is derived. The oregonator steady states are calculated for different values of the stoichiometric coefficient. The steady state was investigated according to the experimental data of the model's authors...
One of the most important goals for this study is to reveal an effective way to develop systematically the state equations that define the analog circuits (linear, non-linear, timeinvariant etc.) with excess elements. These equations can be depicted in various forms, like symbolic form, numeric-symbolic form, numeric-normal form. At the beginning, we designed the calculation method and afterwards...
In this paper is presented the analytic mathematical modeling of surface progressive heating by electromagnetic induction process. For solving the coupled problem of electromagnetic field and heat transfer, it has been used the images method that ensure the boundary conditions on two media with different electromagnetic proprieties. The solutions of the performed equations of electromagnetic field...
The paper presents the strengths and weaknesses of using different core geometries in the present MSR design among side analyzing the particularities of the new features proposed. The calculation was made using the four-factor formula for a steady state reactor and additional simplifications that are explained fully in the following paper. We find that we can achieve a better power density in the...
This paper proposes a methodology of design and control, and shows the main simulation and experimental results for a LLCC Series-parallel resonant converter applied to Wireless Power Transmission (WPT) in-motion. Using Induced Power Transfer (IPT) and considering a near-field energy-transfer method (less than 20 cm), the converter is applied in a small scale electric vehicle (EV). The modeling was...
In this paper, a new continuouse current quasi Z-source inverter (CCQZSI) based on capacitor basic unit is proposed. By using n numbers of the basic units, the developed CCQZSI is proposed. High value of the boost factor is the main advantages of the proposed CCQZSI in comparison with the conventional Z-source inverter. This feature is obtained by considering same value of shoot-through (ST) duty...
This paper proposes a comprehensive analysis of switched boost inverter's (SBI) voltage and current equations, using specific switching method in continuous current mode (CCM) operation. The presented switching method makes SBI proper to be used in galvanic and electrochemical applications. The boundary amount of inductor between the two CCM and discontinuous current mode (DCM) operations is calculated...
For LCL type grid-tied three-phase inverters, a model predictive controller is proposed. Through the controller, system performance indexes, i.e., current tracking, inductor loss, switching loss can be combined and then optimized. Since the controller is a constrained nonlinear problem, an on-line algorithm is presented which is based on branching and bounding method. Finally, through Matlab simulation...
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