Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"Voltage fluctuations"”.
-
Analysis and mitigation of the impacts of integrating fast-charging stations on the voltage fluctuations
… on three power quality phenomena, namely voltage magnitude variations, voltage unbalance, and voltage fluctuation. The Markov Chain Monte Carlo is proposed to estimate the required energy from each fast charging station when it is utilized to charge the electric vehicles, considering their …
-
A Real-time Management of Distribution Voltage Fluctuations due to High Solar Photovoltaic (PV) Penetrations
… challenges. High PV penetration can create overvoltages and voltage fluctuations in the network, which are major concerns for the grid operator. Traditional voltage control devices like switched capacitor banks or line voltage regulators can alleviate slow-moving fluctuations, but these devices …
-
Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies
… nature of photovoltaic (PV) generation can cause voltage fluctuations in power distribution systems. Feedback control can be used to minimize the voltage fluctuations. This thesis presents the results obtained from comparing the control performance of two types of PV generation feedback control, …
-
The power quality of wind turbines in Sout Africa and their impacts on distribution networks
… on distribution networks. The main focus is on voltage fluctuations and flicker as grid connected wind turbines could have a huge impact on these, especially when connected to weak distribution networks.
-
Predicting and identifying signs of criticality near neuronal phase transition
… on the altering characteristics of noise-induced fluctuations near spiking onset and death via Hopf bifurcation. We introduce small-amplitude white noise to enable a linearised stochastic analyses using Ornstein--Uhlenbeck theory to predict variance, power spectrum and correlation of voltage …
-
Transport Properties And Noise Of Low-Dimensional Conductors
… the potential importance of collective charge fluctuations in low-dimensional conductors. The thesis consists of two (almost) independent parts. In the first part, a theoretical model of conduction between the planes ( c-axis conduction) of layered high-temperature superconductors in the normal …
-
Regenerative Electric Spring Based Grid Forming Inverter for Next-Generation Power Systems
… increases grid vulnerability to frequency and voltage fluctuations, requiring advanced control strategies to enhance stable and reliable operation under varying load and generation conditions. In addition, the growing adoption of electric vehicles (EVs) and battery energy storage system (BESS) …
-
A Reliable CMOS Receiver for Power Line Communications in Integrated Circuits
… is a level shifter, which lowers the offset voltage of the supply voltage to approximately 0.5VDD. The second sub-block is a signal extractor, which detects a data signal superimposed on the power line. The signal extractor is a differential amplifier, in which one input is connected through …
-
Low frequency charge-density wave dynamics
… investigated using low frequency conductance fluctuations. Simultaneous measurements of the fluctuations in the voltage and the differential resistance revealed a theory of threshold voltage fluctuations can only partially describe some of the fluctuations in the I-V curve. Noise measurements …
-
Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach
… include overloading of transformers, rapid voltage fluctuations, and over/under voltages. While this compromises the consumer power quality, it also puts on extra stress on the local voltage control devices. These challenges demand a well-coordinated and power network-aware charging approach …
-
Geomagnetically induced currents and their effect on power systems
… causes unusual real and reactive power flows, voltage fluctuations, frequency shifts, undesired relay operations, high third-harmonic currents and telemetry and supervisory alarm failures. A storm on the order of 5,000 nT/min could occur in the not too distant future. Once this storm occurs, …
-
Voltage Regulation for Distribution Networks with Smart Photovoltaic Inverters
Traditional mechanical device-based voltage regulation becomes less effective when the high penetration of photovoltaic (PV) generation introduces rapid and frequent voltage fluctuations to the distribution networks. The PV inverters which are able to provide fast and flexible reactive power …
-
Modeling and Simulation of Parallel D-STATCOMs with Full-Wave Rectifiers
… are incapable of adequately handling the rapid fluctuations in power supply and demand that today’s grid experiences. Flexible AC Transmission System (FACTS) controllers are a practical way to compensate for such rapid power fluctuations. One type of shunt FACTS controller is the Static …
-
A Data Analytics Framework for Regional Voltage Control
… under a heavy loading condition, the unstable voltage condition may cause a cascading outage. The voltage fluctuations are presently being further aggravated by the increasing integration of utility-scale renewable energy sources. In this regards, a fast response and reliable voltage control …
-
Decoherence In Quantum Dot Charge Qubits: The Role Of Electromagnetic Fluctuations
… in experiments cannot be fully explained by the voltage fluctuations as they are investigated here. The limitations of the calculations are discussed and improvements are suggested.
-
Investigation of system-level ESD-induced failures
… by noise entering signal pins or by supply voltage fluctuations. Soft failures have previously been studied by using test structures to identify failure mechanisms or actual products to identify the types of soft failures that occur. These models are either simplified or offer little to no …
-
Multi-fidelity Optimal Trajectory Generation: Optimal Experiment Design for Robot Learning
… delays, state estimation errors, and battery voltage fluctuations often compromise trajectory reliability, even when conforming to ideal dynamics. However, the typical data-driven methods are usually developed in simulated environments. Consequently, the transition to real-world dynamics …
-
The application and assessment of active network management techniques for distribution network power flows
… of DG are seeking connection at the lower voltage distribution networks. Connecting large quantities of intermittent generation, to distribution networks, presents significant problems to the planning and operation of these traditionally passive networks due to bi-directional power flows …
-
Design, Analysis and Experimental Evaluation of a Virtual Synchronous Machine Based Control Scheme for STATCOM Applications
… to help their operation by regulating the PCC voltage. However under different contingencies, PCC voltage fluctuations in magnitude and frequency may impede the STATCOM from tracking the grid frequency correctly, hence worsening its overall compensation performance, and putting at risk the …
-
Stability of distribution networks connected with distributed generation
… impedance lines. These networks suffer extreme voltage fluctuations when a transient disturbance occurs on the network. The distributed generators are connected onto distribution networks that were designed to operate without any generation, but were designed to receive power from the …
Page 1 of 2