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 32 for “"Common coupling"”.
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Voltage rise mitigation at the point of common coupling of large renewable distributed generation and distribution network
Thesis submitted in the fulfilment of the requirements of the degree of Doctor of Engineering in Electrical Engineering, Durban University of Technology, 2022.
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Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System
… the grid. Monitoring power flow at the point of common coupling is one of the many functions the controller should perform. Smart inverters can inject active power to pick up critical load or inject reactive power to regulate voltage within the electric grid. In this context, this thesis focuses …
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Toward Systematic Integration of Inverter-Based Resources in Electricity Markets
… their market participation potential. Two common practices include treatment of IBRs as negative loads and setting a fixed power factor during grid commissioning. Modeling IBRs as negative loads excludes them from dispatch coordination in electricity markets, significantly limiting …
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Analysis of microgrid with renewable generation and energy storage system
… A frequency analysis reveals that the point of common coupling (PCC) frequency is controlled within the operational range of ± 0.3 Hz, according to IEEE Standard I547. This control is achieved using a combination of battery and supercapacitor ESS in both operational modes. A comparative …
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Advanced Power Sharing Scheme under Unbalanced and Nonlinear Loads in an Islanding Microgrid
… of unbalanced and harmonic voltage at point common coupling (PCC). The Primary controller consists of distributed generators local controllers. The local controllers mainly include power droop for sharing active and reactive power among DGs without communication, voltage and current …
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Estratégia de minimização de perdas para um gerador de indução duplamente alimentado
… not compromise the power factor at the point of common coupling neither increase the converter losses.
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Islanding Detection and Cybersecurity in Inverter-Based Microgrids Under a High-Noise Environment
… to analyze fluctuations at the point of common coupling (PCC) under a high-noise environment, focusing on decreasing detection period, zero power mismatch nondetection zone, and power quality degradation. Unlike existing methods, which overlook the noise effect, this study mitigates noise …
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Coordinated active power reduction strategy for voltage rise mitigation in LV distribution network
… network when the voltage at the point of common coupling (PCC) goes above statutory voltage limits. However, the sudden disconnection of the PV system from the grid can cause network perturbation and affect the security of the network. This action may also cause voltage instability in the …
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Power Sharing and Power Quality Improvement in Parallel Connected Power Converters in the Microgrid
… demand among the VSCs connected to the Point of Common Coupling (PCC) bus. The method requires no grid current information or communication links between VSCs, which can significantly reduce the implementation cost. Next, an improved PLL algorithm is presented to achieve fast grid synchronization …
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An Algorithm and System for Measuring Impedance in D-Q Coordinates
… locking on to the voltage vector at the point of common coupling between the analyzer and the system via a PLL to establish a D-Q frame. A series of sweeps are performed, injecting at least two independent angles in the D-Q plane, acquiring D- and Q-axis voltages and currents for each axis of …
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Impedance-Based Stability Analysis in Power Systems with Multiple STATCOMs in Proximity
… propagation paths on the voltage at point of common coupling from synchronization and ac voltage regulation. Using the proposed impedance model, this dissertation identifies the frequency range of interactions in a viewpoint of d-q frame impedances and pinpointed that the ac voltage regulation …
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Dynamic State Estimation of Microgrid With Imperfect Data Communication
… that include normal operation, fault at Point of Common Coupling (PCC), loss of generator, and loss of load. We also developed a scheme to use delayed data in Kalman filter estimation and used it to simulate the effect of data loss and/or delay in the communication system of the microgrid. For the …
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Concurrently coupled multiscale modeling of polymer nanocomposites
Embedded statistical coupling method (ESCM) was originally developed to provide computational efficiency, to decrease coupling complexities, and to avoid the need to discretize the continuum model to atomic scale resolution in concurrent multiscale modeling. ESCM scheme is relatively easy to …
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Integration of wind energy systems into the grid: power quality and technical requirements
… of the network, especially at the point of common coupling or connection (PCC). Various power quality phenomena were discussed in the literature but the ones that were further investigated included the voltage level profile, harmonic distortions as well as reactive power requirements from …
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Design, Analysis and Experimental Evaluation of a Virtual Synchronous Machine Based Control Scheme for STATCOM Applications
… STATCOMs are typically installed at the point of common coupling (PCC) 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 …
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Power sharing strategy using H∞ controller between two distributed generation sources in islanded mode
… power sharing controller techniques are commonly used for sharing loads. However, this non-communication power sharing control technique has a disadvantage, where the frequency and voltage deviations are severe during a sudden load change. Currently, it can be fixed by using the …
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Power sharing conditioning control in single-phase parallel distributed generations with simple improvement of droop control
… as through the connection of DGs to the point of common coupling (PCC). It is to verify the proposed control model has capability to response accurately during the power transient and power sharing conditions at both DGs. In proportion, the implementation of frequency restoration loop to the …
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Adaptive Hierarchical Control in V2G Integrated Micro-grids
… to connect the charging station to the point of common coupling. Development and implementation of an on-line self-tuning adaptive controller for the grid-connected inverter, that overcomes the limitations of conventional fixed gain PI controllers is described in the first part of the thesis. The …
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Spatially Diverse Photovoltaic Power Plants for Reduced Power and Voltage Fluctuation Using Weather Forecast
… PV power plants. The voltage at the point of common coupling fluctuates as power fluctuates which becomes worse on days with popcorn clouds, and is proportional to the PV power penetration. A novel method utilizing an array of four sensors capable of sampling at high rate was developed to …
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Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency
… developing adaptive protection schemes. The most common protective devices widely deployed in the distribution system such as overcurrent relays, reverse power relays at Point of Common Coupling(PCC), fuses, reclosers and feeder breakers need to studied in implementing these schemes. The work …
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