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Measurements of signals associated with a generator beyond the traditionally measured terminal voltage and current are receiving more attention recently due to their promise of increased insight into the operation of the machine and electrical system during transient conditions. Mechanical measurements such as speed, vibration, shaft strain, pressure, and other physical quantities are already used...
The increased deployment of Distributed Energy Resources (DER) and their connection to the existing distribution networks influences the feeder voltage profiles and challenges the voltage control in distribution networks. Traditionally, On-Load Tap Changing (OLTC) transformers are the most common voltage control devices. In this paper, the problem of voltage rise mitigation in distribution networks...
Using more and more sensors, an increase in complexity and quantity of wiring is the consequence. This can be solved by using wireless sensors which are powered by energy harvesting. For this purpose, thermal energy harvesting by using atmospheric temperature variations is investigated by using a test setup in a climate cabin with a 65 minutes temperature cycle with minimum temperature of −40°C for...
In Solar Photovoltaic (PV) generation, an increasingly important issue is the reliability of electronics such as inverters, and how efficiently (and reliably) they interact with the local grid. Total Harmonic Distortion (THD) is increasingly important, relating as it does to efficiency and localised heating. PV is intermittent, so to design controlled experiments to evaluate power quality inverter...
This paper proposes a new Maximum Power Point Tracking (MPPT) algorithm for Photovoltaic (PV) systems to deal with Partial Shading Conditions (PSC). The proposed algorithm combines the advantages of Particle Swarm Optimization (PSO) approach and Proportional-Integral (PI) control technique. The proposed Hybrid PSO-PI MPPT controller uses in the first stage PSO approach to locate the Global Peak (GP)...
The use of distributed generators including solar photovoltaic, wind, small hydro, biomass etc. are playing an important role in the restructured power system. However, there are certain issues related to grid integration of DGs including islanding detection. Hence, it becomes an important area of research nowadays for power engineers. There are various islanding detection techniques including passive,...
One of major contingencies of an electric power system is due to imbalance between loads and generated electric power. This leads to instability in the power system and hence to a blackout. Conventional Under frequency Load Shedding Schemes have been widely used, to restore power system stability. However, the analysis of recent blackouts suggests that voltage collapse and voltage related problems...
In this project, the primary aim is to produce optimum parameters for electric power generation via renewable sea wave energy for the Turkish sea coastlines. The modular system is composed of wave actuation mechanism, hydraulic system and generator. This system is used to model and compute the optimal parameters but also monitor the Turkish coastline characteristics. A hydrodynamic model based optimum...
This paper describes prototype of an automatic test stand for measurement of selected low frequency transmission parameters. There can be measured any 3-terminal (3T) element or circuit. There measurements are performed automatically in two directions (forward and backward), thus the 3T element can be non-symmetrical. Following parameters are measured: voltage gain, phase shift, overshoots (positive...
This paper presents a piezoelectric energy harvester driven by human handy motion vibration to be used in wearable sensors applications. It employs a metal ball to impact (mechanical) consecutively on two flexible sidewalls (while shaken) that act as the bases for two mass-loaded piezoelectric unimorph generating beams. Each impact allows the sidewall to transfer impulsive force to the loaded-mass...
Online dynamic load modeling has become possible with the availability of Static Voltage Compensator (SVC) and Phasor Measurement Unit (PMU) devices. The power of the load response to the small random bounded voltage fluctuations caused from SVC can be measured by PMU for modelling purposes. The aim of this paper is to illustrate the capability of identifying an aggregated load model from high voltage...
In this paper, a fault assessment of a multiphase permanent magnet generator designed for ‘more electric engine’ aeronautic applications is presented. The distribution of various electrical faults occurring in three-phase machines that is available in the literature helped the authors to identify the most probable fault types. The six-phase machine under observation is tested under these faults both...
An ultra-low voltage, low power, low line sensitivity MOSFET-only sub-threshold voltage reference with no amplifiers is presented. The bulk-driven technique is used and most of the transistors work in the sub-threshold operation, which allows a remarkable reduction in the minimum supply voltage and power consumption. Second-order compensation improves the temperature stability and the low sensitivity...
Renewable Energy Sources (RES) plants still have to operate at their maximum possible output and are therefore independent of electric energy consumption. Thus, coordination between distributed generators, energy storage systems and flexible loads is expected to add a great value to grid operations and facilitate further RES penetration. Increasing penetration of home automation technologies at the...
This paper deals with design of software for partial discharge (PD) pattern recognition and signal assessment on power generator using artificial neural network (ANN). The identified PD signal was the simulation of PD measurement result on high voltage generator. The simulated signal contains background noise (BGN) and phase-resolved PD pattern (PRPD pattern) data. The characteristics of information...
With the uptake of embedded renewable generation on distribution networks, it is becoming increasingly challenging to maintain the network within thermal and voltage limits. The application of Active Network Management (ANM) to provide additional thermal and voltage capacity headroom has been successfully applied to connecting wind farms in recent years. Analysis was undertaken in this study to explore...
This paper describes a voltage impulse generator, which is utilized in the commissioning of an electrical grounding system. Unlike the Marx generator with spark gap switches, this converter uses semiconductor devices, which have a long life, better efficiency, and it can operate at high frequencies. The generator's topology uses a boost converter array operating in Discontinuous Conduction Mode (DCM)...
We consider the problem of exploiting the micro-generators connected to the power distribution grid to provide distributed reactive power compensation for voltage support. We review some of the state-of-the-art control strategies, compare and analyze their performance. Furthermore, we propose a novel control strategy that, exploiting communications among neighboring micro-generators, achieves a fast...
Partial discharge inception voltage (PDIV)and /or repetitive PDIV (RPDIV) tests must be performed in order to design and qualify Type I insulation system of electrical rotating machines driven by voltage converters. RPDIV is measured under voltage surges. Compared to PD detections at sinusoidal voltages (PDIV), these measurements are more complex, since the spectrum of the disturbance produced by...
This paper presents a distributed control for dc microgrids that minimize the total generation cost and regulate the average voltage at the desired value. The proposed controller includes two modules; lower cost regulator and voltage regulator. In addition, a sparse communication network with a balanced laplacian matrix is used for data exchange between converters as each converter communicates only...
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