Non-volatile electrochemical memory operating near the thermal voltage limit

2020 ◽  
Author(s):  
A. Alec Talin
Keyword(s):  
Voltage Limit ◽  
Thermal Voltage

Approximation Piecewise Stabilization of the Thermal Voltage Coefficient of Reference Voltage Sources

2020 ◽  
Vol 91 (7) ◽  
pp. 433-439
Author(s):  
M. A. Mastepanenko ◽  
S. N. Bondar ◽  
Sh. Zh. Gabrielyan ◽  
A. V. Ivashina
Keyword(s):  
Reference Voltage ◽  
Voltage Coefficient ◽  
Thermal Voltage

Harmonik Pada Inverter

2018 ◽  
Author(s):  
Asnil
Keyword(s):  
Harmonic Current ◽  
Fundamental Component ◽  
Non Linear ◽  
Voltage Limit ◽  
Standard Limit ◽  
Period Wave

One of the problems of electricity quality is harmonics. Harmonic is one ofthe components sinusoidal from one period wave that has the frequency representingmultiple from the fundamental component. Voltage and current distortion caused bynon-linear loads. One of kinds of non-linear loads is Inverter. Harmonic is verydisturbs and harm when exceeding standard limit that appointed. Standard worn asreference in this research is standard IEEE 519-1992, used to voltage limit andmaximum harmonic current.

scholarly journals Numerical and Experimental Investigation of the Design of a Piezoelectric De-Icing System for Small Rotorcraft Part 3/3: Numerical Model and Experimental Validation of Vibration-Based De-Icing of a Flat Plate Structure

Aerospace ◽  
2020 ◽  
Vol 7 (5) ◽  
pp. 54
Author(s):  
Eric Villeneuve ◽  
Christophe Volat ◽  
Sebastian Ghinet
Keyword(s):  
Numerical Model ◽  
Flat Plate ◽  
Experimental Validation ◽  
Experimental Setup ◽  
Wind Tunnel Testing ◽  
Transient Vibration ◽  
Voltage Range ◽  
Resonant Modes ◽  
Voltage Limit ◽  
Frequency Sweeps

The objective of this research project is divided in four parts: (1) to design a piezoelectric actuator-based de-icing system integrated to a flat plate experimental setup and develop a numerical model of the system with experimental validation, (2) use the experimental setup to investigate actuator activation with frequency sweeps and transient vibration analysis, (3) add an ice layer to the numerical model and predict numerically stresses at ice breaking with experimental validation, and (4) bring the concept to a blade structure for wind tunnel testing. This paper presents the third part of the investigation in which an ice layer is added to the numerical model. Five accelerometers are installed on the flat plate to measure acceleration. Validation of the vibration amplitude predicted by the model is performed experimentally and the stresses calculated by the numerical model at cracking and delamination of the ice layer are determined. A stress limit criteria is then defined from those values for both normal stress at cracking and shear stress at delamination. As a proof of concept, the numerical model is then used to find resonant modes susceptible to generating cracking or delamination of the ice layer within the voltage limit of the piezoelectric actuators. The model also predicts a voltage range within which the ice breaking occurs. The experimental setup is used to validate positively the prediction of the numerical model.

scholarly journals Large Photovoltaic Power Plants Integration: A Review of Challenges and Solutions

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3798 ◽  
Author(s):  
Mansouri ◽  
Lashab ◽  
Sera ◽  
Guerrero ◽  
Cherif
Keyword(s):  
System Integration ◽  
Power Plants ◽  
Large Scale ◽  
System Stability ◽  
Pv System ◽  
Pv Systems ◽  
Large Scale Integration ◽  
Voltage Limit ◽  
The Stability ◽  
Scale Integration

Renewable energy systems (RESs), such as photovoltaic (PV) systems, are providing increasingly larger shares of power generation. PV systems are the fastest growing generation technology today with almost ~30% increase since 2015 reaching 509.3 GWp worldwide capacity by the end of 2018 and predicted to reach 1000 GWp by 2022. Due to the fluctuating and intermittent nature of PV systems, their large-scale integration into the grid poses momentous challenges. This paper provides a review of the technical challenges, such as frequency disturbances and voltage limit violation, related to the stability issues due to the large-scale and intensive PV system penetration into the power network. Possible solutions that mitigate the effect of large-scale PV system integration on the grid are also reviewed. Finally, power system stability when faults occur are outlined as well as their respective achievable solutions.

scholarly journals Behaviour of Distribution Grids with the Highest PV Share Using the Volt/Var Control Chain Strategy

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3865 ◽  
Author(s):  
Daniel-Leon Schultis ◽  
Albana Ilo
Keyword(s):  
Power Flow ◽  
Large Scale ◽  
Reactive Power ◽  
Low Voltage ◽  
Information And Communications Technology ◽  
Optimal Arrangement ◽  
Reactive Power Flow ◽  
Voltage Limit ◽  
Scale Integration ◽  
Distribution Grids

The large-scale integration of rooftop PVs stalls due to the voltage limit violations they provoke, the uncontrolled reactive power flow in the superordinate grids and the information and communications technology (ICT) related challenges that arise in solving the voltage limit violation problem. This paper attempts to solve these issues using the LINK-based holistic architecture, which takes into account the behaviour of the entire power system, including customer plants. It focuses on the analysis of the behaviour of distribution grids with the highest PV share, leading to the determination of the structure of the Volt/var control chain. The voltage limit violations in low voltage grid and the ICT challenge are solved by using concentrated reactive devices at the end of low voltage feeders. Q-Autarkic customer plants relieve grids from the load-related reactive power. The optimal arrangement of the compensation devices is determined by a series of simulations. They are conducted in a common model of medium and low voltage grids. Results show that the best performance is achieved by placing compensation devices at the secondary side of the supplying transformer. The Volt/var control chain consists of two Volt/var secondary controls; one at medium voltage level (which also controls the TSO-DSO reactive power exchange), the other at the customer plant level.

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