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This paper presents the design and implementation of a standalone photovoltaic (PV) system using ultracapacitors as an energy storage unit. Ultracapacitors offer a high power density and long life cycle and could improve PV systems efficiency when subjected to peak loads. The setup is used to evaluate the direct parallel connection between the PV panel and the ultracapacitors bank without additional...
This paper suggests a new protection algorithm for a multi-terminal direct current (MTDC) networks. The current values and directions at each bus connecting more than one line are determined. The measured values of line currents are used to detect faulty conditions based on a specific threshold value. The faulted line is identified using the current direction through each line during a fault. For...
Exact feedback linearization technique is applied to standard DC-DC buck converter using precise model of the system. Considering parasitic resistances of the inductor, capacitor and switches, averaged state space method is used to develop converter model. Hence, developed controller is able to regulate output voltage of the converter in a wide range of operation. Using the optimal control theory,...
A conventional Counter-Comparator Digital Pulse Width Modulator (DPWM) with a fixed slope is dynamically and linearly shifted upwards or downwards by a value proportional to the error signal. The shift is done through applying a positive or negative offset (shift) value depending on the direction of the transient. This control approach aims to improve the transient response and efficiency of an FPGA-based...
This paper presents the design of a Hilbert fractal antenna for the purpose of detecting and classifying different partial discharge (PD) types in an oil-paper insulated system. Three common types of PDs are considered for the multi-class classification problem, namely; PD from a sharp point to ground plane, surface discharge, and PD from a void in the insulation. The designed antenna is connected...
In this paper, a high power grid-connected cascaded H-bridge multilevel inverter (CHB-MLI) operating with Selective Harmonic Elimination (SHE) is presented complying with the low switching frequency operation limitation. In order to alleviate the complexity of employing SHE at high level order, Quasi seven level SHE (Q7L-SHE) approach is employed in this paper. Q7L-SHE is based on cancelling the fifth...
Solar power generation is considered one of the most promising distributed generation (DG) technologies that is utilized in microgrids. Power intermittency and voltage swings of solar resource negatively affect the reliability of microgrids. Battery energy storage systems (BESS) are incorporated in such microgrids to mitigate the power intermittency of photo-voltaic (PV) system. However, this power...
The typical power distribution systems are in radial configurations in which the connection is radial and the power flows in one direction from the substation to the customer's loads. Due to the increased need for more reliable power on the distribution side, and since most of the interruptions experienced by customers originate from the radial distribution side, the future distribution power systems...
In this paper, two control strategies involving “continuous” and “ON/OFF” operation of the diesel generator in the solar photovoltaic-wind-diesel-battery hybrid systems are modeled. The objective of these proposed models is to minimize the system's daily operation cost while finding the optimal power flow considering the intermittent solar and wind resources, the battery state of charge and the fluctuating...
Electric utilities conventionally maintain distribution voltage within acceptable limit using transformer tap changer located at Medium Voltage (MV) side. Traditionally, tap changers receive control signals from single bus and change the tap positions to maintain voltages accordingly. Penetration level, location and intermittent behaviour of the Distributed Generations (DGs) integrated with the distribution...
Lead acid batteries are one of the most commonly used storage devices in residential renewable energy systems. This paper explains the procedure of calculating required capacity of lead acid battery for a residential based renewable energy system. A renewable energy system (RES) is introduced based on a topology of multi-port converter. The basic required stored energy is defined using averaged load...
This paper discusses four compensation topologies of magnetic coupling system suitable for use in contactless power transfer (CPT) applications. The design and modeling process of CPT system is described in detail. Resonance between the source and load is achieved with compensation capacitors connected at the terminals of the coils. Electric equivalent circuit models are used to describe each circuit...
An accurate battery model is one of the most important factors to improve the capability of battery state of charge (SoC) estimation. In this paper, battery hysteresis behaviors under different SoC are considered to decrease battery model error, and the hysteresis voltage based battery model (HVBBM) is presented. The experiment result shows that this model can describe the battery discharging process...
The present paper deals with the application of the real time optimal reconfiguration of a radial power distribution system using three Meta-heuristic optimization algorithms; the Biogeography Based Optimization (BBO), the particle swarm optimization (PSO) and the Genetic algorithms (GAO). The main objective is to minimize the active power loss in the whole system while keeping the voltage at each...
Future smart grids will require an observable, controllable and flexible network architecture for reliable and efficient energy delivery. The use of artificial intelligence and advanced communication technologies is essential in building a fully automated system. This paper introduces a new technique for online optimal operation of distributed generation (DG) resources, i.e. a hybrid fuel cell (FC)...
This paper proposes a vector-control (power-winding flux orientation) strategy for maximum wind-power extraction of a grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG) system. The adopted generator has two stator windings namely; power winding, directly connected to the grid, and control winding, connected to the grid through a bi-directional converter. In addition, a unity...
Many mathematical models have been developed to describe the dynamic behaviour of induction machines and have been utilized in induction machines parameter identification. In some cases, model parameters may not be uniquely estimated, regardless of the used algorithm and the quality and quantity of the used measurements. This non-identifiability is related to the structure of the model itself. In...
The paper presents a study for the impacts of solar energy integration on the power system dynamic stability. A detailed photovoltaic model incorporated active and reactive power controller is used to investigate the effect of replacement of conventional steam power station by solar system considering changing in size and location. The controller depends on decoupled inner d-q current control loops...
This paper proposes an improved computational method to estimate the parameters of the single diode RP model for PV modules. The approach utilized the Differential Evolution (DE) algorithm to accurately determine the values of the photocurrent (IPV), saturation current (Io), ideality factor (a), series resistance (Rs) and the shunt resistance (Rp). In addition, the model performance is enhanced by...
The substation expansion planning (SEP) is a complicated problem with a wide variety of its constraints. This paper presents a novel and efficient method to solve optimal SEP problem to determine optimal number, location, capacity, timing, and associated service area of each substation under all technical constraints over the planning period at minimum costs. In this respect, the genetic algorithm...
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