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With the increasing application of photovoltaic, the micro-inverter with interleaved flyback module operating in continuous conduction mode (DCM) and discontinuous conduction mode (DCM)is more popular. However, its difficult to control output current of interleaved flyback micro-inverter because the transfer function has right-half-plane (RHP) zero in CCM and low gain in DCM. To solve this problem,...
This paper presents an alternative closed-loop control strategy approach of back to back two-level voltage source converter to regulate the dc link voltage. Both rotor speed of the Permanent Magnet Synchronous Generator (PMSG) side and the DC-link voltage of load side are controlled by a PI controller. Modeling and simulation of the control structure has been carried out using PLECS toolbox on Matlab/Simulink...
A robust nonlinear controller is presented for output tracking of a single phase LC-filtered voltage source inverter. The proposed control uses a second order system model to develop an output feedback control scheme based on a variable structure observer. The use of this nonlinear observer allows for elimination of costly current sensors and the ripple and noise which is inherent in such measurements...
This work proposes and simulates a finite set model predictive control technique for the photovoltaic inverter. The power topology is a 30 KW PV array with two power conversion stages: DC/DC boost converter controlled with maximum power point tracking to extract the maximum available photovoltaic power and two-level voltage source inverter with passive filter to convert direct current to alternative...
Medium voltage multilevel inverters are used for high power applications. These will show a significant impact on the system dynamics because of their vast size and high power demand. Switching models for these multilevel inverters are already available through Mat lab/Simulink. Anyway Dynamics in the system cannot be analyzed using the switching models in Power system. So Load modeling and analysis...
Field oriented control (FOC) is considered as one of the most efficient techniques for speed tracking problem of permanent magnet linear synchronous motor (PMLSM) drives. However, the main inherent drawbacks of classic FOC methods are the high sensitivity to machine parameters, high switching frequency and unsuitable performances in tracking low speeds. In this paper, a new strategy based on nonlinear...
This work focuses on micro-grid, containing various alternative energy resources (wind and photovoltaic) and super-capacitor energy storage system which performs in stand-alone as well as in grid-connected modes. Various non-isolated converters are used to control the proposed micro-grid. A classical-based supervisory control scheme is designed to perform energy management in order to satisfy the...
Nowadays, the increase in nonlinear loads has contributed to the generation of harmonics in the source current which in turn causes low power factor and disturbance in the power system. Active power filters (APFs) are known to provide one of the solutions to this harmonic related issue. Various types and configurations of APFs and control have been reported in literature. This paper proposes the integration...
Switched power systems are inherently difficult to simulate, due to the significant sensitivity of the simulation algorithm to the timing of the switching events as well as the potentially complex dynamics of the components. Numerical simulation techniques, while flexible, are not well suited for large time scale simulation of such systems. Methods for increasing the accuracy of numerical simulation...
In this paper, it is described how the circulating current flows between inverters which have isolated DC-link such as Cascaded H Bridge (CHB) topology, when they operating in parallel. In this case, Zero Sequence Circulating Current (ZSCC) flowing through shared DC-link cannot flow between inverters in parallel. However, circulating current is provoked by asynchronous switching instant of devices...
One solution towards a resilient electric distribution system during extreme weather conditions and other natural disasters is microgrid with distribution automation. This low voltage bottom-up black start capability and feeder reconfiguration capability allow true realization of the full potentialities of distributed generation. This paper exploits the black start of a low voltage network supported...
Recently, Model Predictive Controller (MPC) becomes the most attractive control in power electronics and drives applications. It is incorporated in Z-Source Inverter family (ZSI) where each of capacitor voltage, inductor current and output load currents could be controlled at their setting points' values. In this paper, a proposed algorithm for qSZI is introduced to simplify the system through reducing...
This paper proposes a dual three-leg voltage source inverter (VSI) based distribution static compensator (DSTAT-COM) to compensate unbalanced and nonlinear loads in three-phase four-wire distribution systems. The proposed topology uses two three-leg inverters having common dc-link with single dc capacitor and an additional small capacitor connected from the negative terminal of VSI to the system neutral...
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 investigates two power quality improvement strategies for microgrids designed for urban community environment such as, buildings in medium-to-large constructions like universities, greater residential communities, financial districts, industrial zones, etc. In developing countries, the rate of increase in the demand is more than the supply, which results in regular outages. There are number...
Photovoltaic (PV) systems are solar energy supply systems, which either supply power directly to an electrical equipment or feed energy into the public electricity grid. In the photovoltaic system, power electronic conversion is necessary to improve the efficiency of PV panels and system stability. In these systems, the backstage power circuit consists of a high step-up DC to DC converter and a full-bridge...
This paper proposed a generalized modeling methodology based on the PWM Switch Model for steady-state analysis and dynamic performance investigation of the single phase inverter. The motivation, algorithm and modeling methodology are presented. The developed models are verified against the switching models of both a half bridge dual buck inverter and a half bridge inverter in time domain to demonstrate...
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...
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...
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.
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