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Controlled grid separation is an emergency preventative measure performed on a system suffering from voltage, frequency or angle instability that is predicted to lead to unplanned system separation. Recent advance in technology has brought about the concept of Wide Area Measurement Protection and Control (WAMPAC) which is based on Phasor Measurement Units (PMUs). PMUs have the ability to measure voltage...
Most of the distance relays base their operation on the measured apparent fault impedance. These relays are bound to have an error inflicted by the unknown remote end parameters and fault resistance. This paper presents a method, which diminishes such errors using optimization techniques. The proposed method executes a system model unknown parameter estimation by adjusting model output to measurements...
Defensive islanding is one of the corrective control methods for securing the power system from severe cascading contingencies. Since the power system is operating in continuously changing operating conditions, the defensive islanding scheme must be adapting to these changes to arm the system against any potential instability. In this paper, we explore the effectiveness of a defensive islanding method...
The increasing penetration of distributed generation has lead international authorities to integrate the rules for the connection of active end-users to distribution networks. Thus, power regulating functions aiming at supporting the voltage and frequency stability of the main grid have been recently introduced in European grid codes. In this paper, the consequences of adopting such regulating functions...
An ultra low power CMOS voltage reference has been developed in a low-cost CMOS 130 nm technology. The design benefits in particular from using only one standard CMOS process without incorporating any resistors, op-amp, bipolar transistor or other CMOS processes. The circuit draws ultra low current of 230 nA from supply voltage of 1.2 V. The proposed circuit generates output an voltage of 698.5 mV...
This work presents a comparison of several methods of tracking the maximum power point (MPPT) to extract the maximum power and improve the control performance of a photovoltaic system. The control techniques most used in MPPT control are reviewed, studied and developed such as: observation and perturbation (P&O) [1] and conductance increment (INC), Fuzzy Logic Control (FLC). The simulation results...
Triboelctricity is a widely known phenomenon which occurs when certain materials gets charged as they come in contact with each other. The contact may involve tapping, sliding and rubbing such that electron exchange occurs that results in creation of net potential difference. This work presents a study of a double-electrodetriboelectric energy harvester. This harvester utilizes the sliding motion...
This paper is focused on challenges related to an increased quantity of distribution energy resources connected to the distribution network within the context of newly defined requirements ENTSO-E, follow-up European standards TS 50549 and codes of distribution system operators on regulation of voltage through control of the reactive power in terms of P-Q diagram. A high number of connected and operated...
This paper presents a multiphase buck converter with optimum-damping-control and current-balanced techniques. The proposed optimum-damping-control and current-balanced techniques can achieve current balance to avoid output current flow in one phase. The phase controller is used to control multiphase buck converter. This configuration provides wide output current range from 400 mA to 4 A. It also has...
A reconfigurable digital bridge for calibrations of four terminal-pair defined impedance standards in the whole complex impedance plane by means of fully digital (FD) operation of the bridge and for R-R and C-C calibrations by means of involvement of reference inductive voltage divider (IVD) in digitally assisted (DA) configuration have been built during last years. For the bridge purposes, a high...
In this paper an estimation scheme for a power grid based on distributed observers is presented. Assuming that the only measurements available are the generator phase angles, our approach allows us to consider an observer for each bus of the power grid, exploiting on only knowledge of local information about the power system. In particular, we design a super-twisting-like sliding mode observer for...
With the integration of various distributed generators (DGs), traditional distribution networks have been transforming into active distribution networks (ADN). One typical challenge of the integration of DGs is that the fault current can possibly exceed the opening capacity of the related breakers. This paper presents a novel distributed solution, which can be hosted in the distributed feeder relays...
This paper presents a methodology for prioritizing bus locations of a power system for PMU placement. This is based on the identification of strategically important locations of power systems using eigenvalue analysis of the measurements of the system variables. The eigenvalue analysis was implemented using Principal Component Analysis (PCA) and the methodology was tested on the IEEE 118-bus system...
Although the demand and generation of electric power have kept on increasing at comet's pace post-independence of our country, maintaining systems reliability has been an issue we are struggling with even today. With large grid blackouts taking place, there exists a possibility of saving at least the cities of economic and strategic importance through power system islanding and hence avoid facing...
On-chip true random number generators (TRNG) have been gaining attention as an important component for building secure systems [1]. CMOS TRNGs typically exploit device-level noise, such as thermal or flicker noise to generate random bits [2]. Among various types of CMOS TRNGs, the meta-stability-based TRNG is known to have very high throughput for random bit generation, but it requires sophisticated...
The next generation of implantable medical devices focuses on minimally invasive miniaturized solutions that operate reliably at large depths, provide duplex communication for closed-loop therapies, and enable multi-access for a network of implants to gather information or provide systemic interventions. Using ultrasound (US), power and data can be efficiently transferred through the body as its wavelength...
In this paper, we consider the construction of True Random Numbers Generators (TRNGs) using variations in power supplies. We demonstrate that power supply line outputs do not have a constant voltage and the variations in voltage follow a normal distribution. These variations can be used to create truly random bits that demonstrates a high entropy rate based on the results obtained from the NIST Statistical...
The authors present in this paper, the experimental verification results for a permanent magnet synchronous machine mounted in the bicycle wheel operating as a generator. Thus are validated the numerical simulations performed using the computational numerical model which uses the finite element method. The verification of the generator operation has been made in no-load regime and in three-phase resistive...
Voltage stability assessment methodology based on construction of equivalent reactive power reserve utilizing limited access to observables is described in the paper. The purpose of the method is to be able to evaluate voltage stability margin in an on-line manner without the need to perform voltage stability analysis every time a contingency occurs in the power system. It is shown that by using reactive...
Optimal frequency controllers for power networks based on distributed averaging have previously been shown to be an effective means of distributing control authority among agents while maintaining a globally optimal operating point. Distributed control architectures however require an implicit trust between participating agents, in that each must faithfully communicate the appropriate control variables...
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