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 20 of 45 for “"VSC"”.
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A series-connected VSC for voltage regulation, balancing and harmonics mitigation
Voltage sensitive electronic equipment, such as computers, process controllers, programmable logic controllers, adjustable speed drives and robotic devices is increasingly used in modern industrial processes. Industrial loads thus require a supply free of voltage disturbances such as voltage dips, …
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Dynamic phasor modelling of VSC FACTS devices for small signal stability studies
… converters in flexible ac transmission systems (VSC-FACTS) systems is presented using synchronous dq and dq-dynamic phasor approach.;Two types of the VSC-FACTS devices are studied in this thesis; the static synchronous compensator (STATCOM) due to its popularity in the power system network and …
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Phase domain modelling and simulation of large-scale power systems with VSC-based FACTS equipment
… dynamic power flow equations pertaining to the VSC-based FACTS controllers and the power network are fully described in the thesis. The steady-state mathematical models of VSC-based FACTS controllers are formulated in nodal form using the frame of reference of the phases. Guidelines for their …
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Modeling, control and stability analysis of VSC-HVDC links embedded in a weak multi-machine AC system.
… links based on voltage source converter (VSC) technology operating in parallel with the existing longitudinal Australian power system. This thesis presents the principle design methodology to achieve robust controllers for VSCs including inner current controller, outer power and voltage …
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Stability analysis of the Namibian power grid with integration of large offshore wind farms using a VSC-HVDC scheme
A thesis submitted in fulfillment of the requirements of the Degree of Master of Engineering in Electrical Power, Durban University of Technology, Durban, South Africa, 2021.
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Virtual Synchronous Machine based Fuzzy V-F Control for VSC of Battery Storage System for Seamless Performance of Microgrid
… In this thesis, voltage source converter (VSC) of PV generating unit operates in P-Q control mode in both grid-tied and islanded operation of microgrid due to its intermittent characteristics. The VSC of battery energy storage system (BESS) operates in P-Q control mode during grid-tied …
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Modeling of voltage source converter based HVDC transmission system in EMTP-RV
Voltage Source Converter (VSC) applications include but are not limited to HVDC, Flexible AC Transmission System (FACTS) devices such as STATCOM, SSSC, UPFC and Wind generators and active filters. The VSC based HVDC system is a feasible option for bulk power transmission over long or short …
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The Vela Supercluster - does it provide the missing link to explain the local flow fields?
… region, hereafter called the Vela Supercluster (VSC). The prospective VSC is at a mean redshift of cz ~18, 000km s⁻¹, and extends approximately about 87 x 87Mpc on-sky. We use a nearest neighbour algorithm to identify the galaxy clusters and groups within the potential VSC, determine their …
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Improved HVdc dynamic performace via phase locking to virtual Thévenin voltage
… benefits accrue in LCC-HVdc systems as well as VSC-HVdc systems. In the LCC-HVdc system, a frequency scan of the system shows the use of the IC-PLL reduces the effective resonant impedance of the system, and therefore increases system’s immunity to the harmonic instability at low order …
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Control of Grid-Connected Converters using Deep Learning
… (GCCs) such as the voltage-sourced converter (VSC) is through a decoupled control loop in the synchronous reference frame. However, this model-based control method is sensitive to parameter changes causing deterioration in controller performance. Data-driven approaches such as machine learning …
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A Power Conditioning System for Superconductive Magnetic Energy Storage based on Multi-Level Voltage Source Converter
… PWM operation and has a multi-level chopper-VSC structure. The prototype test system has three-level that can handle up to 250-kVA with a 1800-V DC link, a 200-A maximum load current , and a switching frequency reaching 20-kHz with the help of zero-current-transition (ZCT) soft-switching. …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
… high-speed induction machine drive. The 2L VSC is the most widely applied converter for high-speed drives. However, the 3L-NPC VSC is an attractive topology if drastically increased switching frequencies are required. A detailed comparison between a 2L VSC and a 3L-NPC VSC as the machine …
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Effect of System Dynamics on Shape Memory Alloy Behavior and Control
… A Variable Structure Control (VSC) based on the angular position and velocity is presented that has a relatively better erformance for all the set-points. To improve the erformance of the VSC, in terms of the steady state error, an Extended Kalman Filter is designed and used to …
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Harmonic emissions assessment for common DC and AC electric vehicle charging station architectures
… two-level Voltage Source Converter (VSC) is used to connect the EV FCS to the grid, and further cascaded DC-DC converters are used for voltage regulation at the charger end. The Unit Template (UTC) and dq-SRF control methods are implemented for switching control of the VSC. The …
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Increasing the capacity of an ultrasonic communication systems using variable structure control
… the design of a Variable Structure Controller (VSC)-based transmitter and receiver with the aim of increasing the capacity of a PM-based US communications system. Simulation results are presented to demonstrate that a VSC controller can be employed in combination with US transducers to achieve …
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Power Sharing and Power Quality Improvement in Parallel Connected Power Converters in the Microgrid
… electronics-based Voltage Source Converters (VSCs) have been widely used as an interface between energy source and the grid/load in microgrid system. The VSCs are required not only to provide the basic function that achieves reliable and accurate power sharing in a microgrid, but also to …
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Analysis of the Power Conditioning System for a Superconducting Magnetic Energy Storage Unit
… (PCS), consisting of a voltage source converter (VSC) and bi-directional two-quadrant DC/DC converter (chopper), was developed at the Center for Power Electronics Systems (CPES) under an ONR funded program. The project was to develop advanced power electronic techniques for SMES Naval …
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Further analysis and application of the multirate method for power system dynamic simulation
… attributes of Voltage Source Converter-based DC (VSC-HVDC) transmission for voltage stability, and then presents further analysis of the multirate method and its application to power system dynamic simulation"--Abstract, page iv.
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Design, Implementation and Evaluation of a Microgrid in Island and Grid Connected Modes with a Fuel Cell Power Source
… can operate the microgrid in both islanded (VSC with voltage and frequency regulation) and grid connected (VSC with current control for power transfer). The experimental laboratory microgrid was constructed and operated in real-time performing its black start and managed transitions between …
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Simulation of voltage source converter based shunt active filter in EMTP‐RV
… This thesis models a Voltage Source Converter (VSC) based shunt active filter (SAF) to filter harmonics due to large non linear loads. SAF compensates the harmonics by injecting a compensating current which is equal in magnitude but opposite in phase to the disturbance in the system. The power …
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