A5027769464- HVDC Systems and Fault Protection
- Power Systems Fault Detection
- Islanding Detection in Power Systems
- Microgrid Control and Optimization
- High-Voltage Power Transmission Systems
- Optimal Power Flow Distribution
- Smart Grid Energy Management
- High voltage insulation and dielectric phenomena
- Electrical Fault Detection and Protection
- Smart Grid Security and Resilience
- Power System Optimization and Stability
- Power System Reliability and Maintenance
- Silicon Carbide Semiconductor Technologies
- Magneto-Optical Properties and Applications
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Real-time simulation and control systems
- Thermal Analysis in Power Transmission
- Power Line Communications and Noise
- Wind Turbine Control Systems
- Electricity Theft Detection Techniques
- Electric Vehicles and Infrastructure
- Photovoltaic System Optimization Techniques
- Cardiac Structural Anomalies and Repair
- Electromagnetic Compatibility and Noise Suppression
University of Strathclyde
2016-2024
UK Power Networks
2023-2024
Imperial College London
2019
High-voltage direct-current (HVDC) systems are being widely employed in various applications because of their numerous advantages such as bulk power transmission, efficient long-distance and flexible power-flow control. However, line-commutated-converter-based HVDC suffer from commutation failure, which is a major drawback, leading to increased device stress interruptions transmitted power. This paper proposes predictive control strategy, deploying failure prevention module mitigate the...
This paper presents a method for rapid detection of faults on voltage source converter multiterminal HVdc transmission networks using multipoint optical current sensing. The proposed uses differential protection as guiding principle, and is implemented measurements obtained from the sensors distributed along line. Performance assessed through detailed transient simulation MATLAB/Simulink models, integrating inductive dc-line terminations, dc circuit-breaker network fiber-optic sensors....
This paper is concerned with the design of an autonomous hybrid alternating current/direct current (AC/DC) microgrid for a community system, located on island without possibility grid connection. It comprised photovoltaic (PV) arrays and diesel generator, AC loads, battery energy storage devices ensuring uninterruptible power supply during prolonged periods low sunshine. A multi-objective, non-derivative optimisation considered in this residential application; primary objective system cost...
When faults occur in the microgrids, high frequency transients will be superimposed on system currents and voltages. The magnitude of those attenuate as it encounters discontinuity points network such busbars, or any other impedance points. This phenomenon can also quantified by wavelet energy, which provides a useful tool to detect locate faulted feeder microgrid. In this paper, novel protection scheme based transient energy current extracted Maximal Overlap Discrete Wavelet Transform...
Abstract This paper presents a roadmap to the application of AI techniques and big data (BD) for different modelling, design, monitoring, manufacturing operation purposes superconducting applications. To help superconductivity researchers, engineers, manufacturers understand viability using BD as future solutions challenges in superconductivity, series short articles are presented outline some potential applications solutions. These futuristic routes their materials/technologies considered...
Hybrid microgrids which consist of AC and DC subgrids interconnected by power electronic interfaces have attracted much attention in recent years. They not only can integrate the main benefits both configurations, but also reduce number converters connection distributed generation sources, energy storage systems loads to or buses. In this study, structure hybrid is discussed, then a broad overview available protection devices approaches for presented. After description, analysis...
This paper presents a new method for locating faults in multi-terminal direct current (MTDC) networks incorporating hybrid transmission media, including segments of underground cables and overhead lines. The proposed traveling wave type uses continuous wavelet transform applied to series line measurements obtained from network distributed optical sensors. technical feasibility optically-based dc measurement is evaluated through laboratory experiments using Fiber-Bragg Grating sensors other...
The ambitious global targets on decarbonization present the need for massive integration of renewable generation in power systems, resulting a significant decrease system inertia. In addition to reduction inertia, transmission Great Britain (GB) faces some unique challenges owing its relatively small capacity, while being decoupled from other systems and with resources largely non-uniformly distributed across system. This paper presents opinions insights associated frequency control...
Speed and selectivity of DC fault protection are critical for High-Voltage (HVDC) grids present significant technical economic challenges. Therefore, this paper proposes a non-unit solution that detects discriminates faults based on frequency domain analysis the transient period faults. The representation generic HVDC grid section corresponding DC-side signatures in form basis generalized approach analytically designing scheme Wavelet Transform (WT). proposed is adaptive within its design...
The electrical energy generated from renewable resources connected to transmission and distribution systems the displacement of synchronous generators continues grow. This presages a paradigm-shift away traditional provision ancillary services, essential ensure robust system, transmission-connected towards non-synchronous generation (including distribution-connected resources). Given that available at disposal system operators are continuously increasing, flexibility for operating network...
Fault detection and protection of Superconducting Cables (SCs) is considered a challenging task due to the effects quenching phenomenon High Temperature (HTS) tapes prospective magnitude fault currents in presence highly-resistive faults converter-interfaced generation. This paper presents novel, time-domain method for discriminative power system incorporating SCs high penetration renewable energy sources. The proposed algorithms utilizes feature extraction tools based on Stationary Wavelet...
This paper provides an assessment of passive islanding detection methods in DC microgrids.In order to analyse the response a microgrid event, voltage and current signatures are captured locally at terminals Distributed Energy Resources (DERs).Further analysis on measurements is carried out derive Rate Change Voltage (ROCOV) Current (ROCOC), distinguish between genuine events other disturbances.A detailed has been developed MATLAB/Simulink DERs within during intentional or unintentional...
This study presents a method for discriminative detection of direct current (DC) faults on voltage source converter-powered multi-terminal high-voltage transmission systems using two fundamental guiding principles, namely instantaneous current-differential and travelling waves. The proposed algorithm utilises local measurements from all lines connected to DC busbar, measurement the side converter. scheme operates at sampling frequency 96 kHz, which conforms with IEC 61869-9. No long distance...
The DC-side line faults in high-voltage direct-current (HVDC) systems utilising voltage-source converters (VSCs) are a major concern for multi-terminal HVDC which complete isolation of the faulted system is not viable option.A number challenges posed by both pole-to-pole and pole-to-ground including presence very fast high amplitude discharge current from DC-link capacitance, lack suitable DC breaking devices, highly discriminative fault detection techniques.Therefore, occurring along...
Commutation failure is a serious malfunction in line-commutated high voltage direct current (HVdc) converters which mainly caused by the inverter ac faults, and results temporary interruption of transmitted power damage to converter equipment. In this article, controllable commutation inhibitor (CCFI) developed obviates main drawbacks existing electronic based fault limiting strategies. Under normal circumstances, CCFI improves steady-state stability transfer capability lines, while it does...
This paper introduces a current differential protection scheme, appropriate for application in medium voltage active distribution systems, where it is desired to keep the greatest possible number of loads and DG units energized during fault. Conventional two-terminal percentage relays are used form successive, time-current-coordinated, zones. Multiple time-delayed elements each zone guarantee coordination with zone's lateral devices, as well between successive Sensitive protect against...
This paper presents the development of a novel data-driven fault detection and classification scheme for DC faults in multi-terminal HVDC transmission system which incorporates superconducting cables modular multi-level converters. As deployment bulk power from remote renewable generation is progressively increasing future energy grids, many fault-related challenges have been raised (i.e., detection, protection sensitivity/stability). In this context, applications Artificial Intelligence...
This work presents the outcome of a comprehensive study that assesses transient behaviour two high voltage direct current (HVDC) networks with similar structures but using different converter topologies, termed two-level and half-bridge (HB) modular multilevel (MMC). To quantify impact topology on DC characteristics detailed comparative is undertaken in which responses HVDC network transients during dc side faults are evaluated. The systems permanent pole-to-pole poleto-ground analysed...
In this article, a novel, learning-based method for accurate location of faults in multiterminal direct current (MTdc) networks is proposed. By assessing the dc circuit breaker currents during fault clearance process, pattern recognition approach adopted from which estimated. The implementation algorithm allocated into three main stages, where similarity coefficients and weighted averaging functions (incorporating exponential kernels) are utilized. For proposed algorithm, only short-time...
This paper presents a novel load shedding scheme with consideration of the active power ramping capability Distributed Energy Resources (DERs) to address challenges due low inertia and diverse types DERs in microgrids. In paper, it is demonstrated that small microgrids, even sufficient reserve power, frequency could rapidly drop level trigger DERs' under protection (thus total system collapse), if not ramped up at rate. The proposed addresses this challenge by considering only reserve, but...
Electric Vehicles (EVs) are becoming increasingly available and expected to be a large part of the load in future power systems. EV chargers relatively new type mainly interfaced with grid through electronics. It is therefore important investigate impact they have on system dynamic behaviour. In this paper, two detailed charger models (representing typical slow fast charger) were investigated. The aim was test capability standard static—and more importantly, dynamic—load models, commonly...