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.
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Showing 1 to 16 of 16 for “"Constant Power Loads"”.
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An energy buffer for constant power loads
Constant power loads (CPLs) are a class of loads steadily increasing in use. They are present whenever a load is regulated to maintain constant output power, such as with LED drivers in high quality lighting that is impervious to input fluctuations. Because CPLs exhibit a negative incremental input …
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Dynamics of RC trees with distributed constant-power loads
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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SMALL SIGNAL STABILITY ANALYSIS OF THREE-PHASE MICROGRID SYSTEM IN THE PRESENCE OF CONSTANT POWER LOADS
… for three-phase microgrid systems with regulated power converters which are used for connecting multiple distributed energy resources (DERs) and in various motor drive applications. The converters behave as constant-power loads (CPLs) and cause instability issues in the system. An impedance-based …
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A Microgrid Architecture With Multiple-Input DC/DC Converters: Applications, Reliability, System Operation, and Control
… control are analyzed. Multiple-input converter power budget equations are derived and verified through simulations and experiments. Issues in distributed architectures, such as autonomous control, and fault detection and mitigation are also addressed. An autonomous control strategy that relies …
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Stability-constrained design for low voltage DC microgrids
… DC microgrids as a result of tightly controlled loads in the presence of inductive delays. First, we examine the instability that arises when a constant power load is added to or removed from a network where the topology is unknown. While removing the dependence of the stability certificate on …
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Effect of conductor size on the total cost of electricity distribution feeders in South African electrification
… costing methods assume that consumers behave as constant power loads. The impact of conductor voltage drops on changes in consumer energy consumption and demand and hence changes in utility bulk purchase cost and sales revenue are ignored. Traditional load loss calculation methods do not …
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D-q impedance identification in three phase systems using multi-tone perturbation
In electric power systems, the existence of constant power loads such as output-regulated power converters may bring instability problem to AC or DC distributed systems. Impedance based stability criteria has been proven a good tool for small-signal stability analysis. This works focuses on the …
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Waveform relaxation methods for the simulation of systems of differential algebraic equations with applications to electric power systems
… as Waveform Relaxation (WR) for simulating large power system dynamics. Past work has shown the feasibility of this method for frequency studies involving the classical model generator and loads modeled as constant impedances. This work has been expanded to include voltage studies where the loads …
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Measurement and Modeling for Resource Monitoring
… used for resource tracking require electrical power that may not be easily available at the installation site. The toroidal current transformer based magnetic energy harvester (CTMEH), which leverages the existence of extensive electrical power grid cabling, provides a potential solution. Its …
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Methods for Parameter Estimation with Devices in Microgrids
… which may exist within a low voltage microgrid. Constant power loads, diesel gensets, and solar inverters can all be found in low voltage microgrids. This thesis will discuss each model and seek to find optimal parameters for each device’s operation. First, two different dynamic constant power …
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Stability Methods for Regulated Loads
Power electronic circuits often regulate load power and present a constant power profile to the utility or other electrical source. These constant power loads (CPLs) therefore exhibit a negative incremental input impedance and pose stability challenges when present in either dc or ac systems. This …
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Dynamic modeling, stability analysis, and controller design for DC distribution systems
… of renewable energy sources into the current power grid and are considered to be the key enabling technology for the development of future smart grid. Dc microgrids also benefit from better current capabilities of dc power lines, better short circuit protection, and transformer-less conversion …
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Stability Analysis of Three-Phase AC Power Systems Based on Measured D-Q Frame Impedances
… stability is of great concern for distributed power systems with a large number of regulated power converters. These converters are constant-power loads (CPLs) exhibit a negative incremental input resistance within the output voltage regulation bandwidth. In the case of dc systems, design …
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Load Learning and Topology Optimization for Power Networks
… efficiency, reliability, and stability of modern power networks. To this end, the work in this thesis explores a generalized modeling and analysis framework for two pertinent tasks: i) learning loads via grid probing, and; ii) optimizing power grid topologies for stability. Distribution grids …
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Estimation Based Adaptive Controllers for Microgrid Connected Boost Converters
… are an excellent solution to integrate modern power generation and consumption with legacy infrastructure. Their flexibility and adaptability make them ideal for several applications combining Renewable Energy Sources and Energy Storage Systems, interfacing them with traditional generation …
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Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design
DC power distribution has gained popularity in sustainable buildings, renewable energy utilization, transportation electrification and high-efficiency data centers. This dissertation focuses on two aspects of facilitating the application of dc systems: (a) system-level control to improve load …