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The paper addresses the problem of fault detection in an unbalanced microgrid with distributed generators, using algorithms based on harmonic estimation: Wavelet Transform (WT), Fast Fourier Transform (FFT) and Reduced Fast Fourier Transform (RFFT). Simulations were carried out in the MATLAB/SimPowerSystems environment. Modified IEEE13 bus system with distributed generation was used. Experimental...
The proposition for this study is to assess how much simulation results can differ from real measurements on the implementation of a control strategy for a grid-connected PV inverter. The system is simulated in Matlab/Simulink and experimentally evaluated on a real low-voltage distribution grid. The PV inverter is implemented using a power-hardware-in-the-loop platform running the control algorithm...
Electrical power demand have grown rapidly over the years which results in power system congestion, depletion of fossil fuels and increased environmental hazards. Further existing power system generations are inadequate for the exponential demand growth. Environmental risks and depleting fossil fuels created a pocket for renewable energy based distributed generations that are cleaner, and renewable...
Use of renewable sources of energy for charging of electric vehicle(EV) batteries have generated tremendous interest. The use of off-board DC chargers to reduce the weight and increase space inside an electric vehicles has been an important area of interest. Harvesting solar energy to charge electric vehicle batteries can result in large inefficient systems when multiple power conversion stages are...
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...
The commercially available, inverter-resident anti-islanding methods are expected to be challenged by the future scenario of increasing photovoltaic penetration and some have shown limitations presently. A predictive approach for islanding-detection can be a smarter solution than the existing reactive approach. Accordingly a framework having a modified IEEE radial test feeder with a solar photovoltaic...
Distributed generation is violent fluctuations because it depends on output of the clean energy generation system. Thus a power leveling system (PLS) is applied to maintain a balance between power supply and such an irregular power generation. The PLS is required to operate charge or discharge of storage and bidirectional power flow. Thus the PLS consists of a bidirectional buck/boost DC/DC converter...
In recent years the amount of embedded PV generation in distribution networks has increased significantly. Currently, there is no standard approach on how to model the effect of this generation on the network. This paper aims to provide some guidelines on how to model embedded PV generation in distribution networks. A number of approaches are considered the first being a distributed approach to modelling...
This paper presents a robust sliding mode based control method of a grid connected large scale photovoltaic (PV) system to enhance low voltage ride through performance. Recent grid codes dictate that PV plants need to stay connected with the power grid during the network faults because of their increased power penetration level. This requires the system to have large disturbance rejection capability...
Distributed energy resources (DERs) powered by natural gas engines are becoming more popular in several nations. This paper presents the modeling and analysis of engine fuel map limits on natural gas powered DERs installed at the CERTS Microgrid. A physics-based approach is used for correct modeling of the limiting conditions in DERs. The distinguishing characteristics of both inverter-based and synchronous...
This paper presents a model of a distributed generation system that could operate both autonomously and connected with the grid. Mathematical models of the distributed energy resources were used to study the dynamic behavior of the interconnected system that includes a three-level control system. State-space models for entire grid-connected system were developed and the small-signal stability of the...
This paper presents a typical application for the estimation of maximum distributed photovoltaic (DG-PV) penetration level (PL), driven by flyback inverters in discontinuous conduction mode (DCM). This will be accomplished by developing the full average model for the flyback inverter in DCM, in order to simulate and predict its behavior during transient and steady state conditions. The main contribution...
As solar energy continues to increase in the current power grid, the reactive power support capability from photovoltaic grid-tie inverters may be used to regulate feeder voltage and reduce system losses on medium- and low-voltage distribution systems. The focus of this paper is to develop a smart-grid-enabled control algorithm that will determine the amount of reactive power injection or absorption...
The recent growing in small grid-tied photovoltaic systems for residential users, with public and private investments politics found in several countries, started a demand for a new generation high efficiency DC-AC inverters. These inverters should have good modularity, low size, weight and cost, with good energy quality at output and maximum power tracking of each solar panel. Multilevel inverters,...
In this paper a simple digital implementation of one cycle control for the driving of a bidirectional three-phase back-to-back inverter is discussed. Such a digital implementation has been simulated in both grid-connected and stand alone configuration and the achieved performances have been compared with the corresponding ones obtained by adopting the standard analog implementation of one cycle control...
This paper presents a new robust control strategy to improve the steady-state and transient stabilities of a grid connected large scale photovoltaic (PV) system. The grid codes for PV system to provide dynamic grid support are getting stricter due to the substantial increase in the power generation from grid connected PV systems, in recent years. The proposed control scheme helps quick voltage recovery...
Power quality problems such as variation of reactive power consumption and distorted current injection in distributed generation system can be compensated by a single-phase conditioner. The proposed conditioner works in feed forward mode and placed in parallel with the PV-inverters in the distributed generation system. A simple current extraction method is applied and an operating algorithm of the...
A fast simulation platform dedicated to Micro Grid (MG) applications is proposed in the paper. The proposed simulation platform is essentially an additional library of the general simulation software PSCAD, which includes components and models in MG application. The content of the proposed simulation platform is introduced with 2 example models. A seamless control strategy is proposed to evaluate...
With the deregulation of the electric power industry and the advancement of new technologies, the attention of the utilities has been drawn towards adapting Distributed Generation (DG) into their existing infrastructure. In this paper photovoltaic (PV) systems are modeled to study the effects of their interconnection in a distribution system. The system is a combination of the PV array, DC-DC boost...
Distributed resources are finding increased penetration in developing countries like India. The increased acceptance of such resources is mainly due to their modularity, increased reliability, good power quality and environment friendly operation. These are currently being interfaced to the existing systems using voltage source inverters (VSC's). The control of such distributed resources is significantly...
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