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A fast overcurrent protection scheme was developed for GaN gate injection transistors (GITs), harnessing the relationship between the externally measured vgs and id in steady-state operation. This relationship has been characterized in both static and dynamic testing over a wide range of operating conditions, and a circuit has been constructed to implement this control scheme. The circuit uses analog...
High proliferation of Inverter Interfaced Distributed Energy Resources (IIDERs) into the electric distribution grid results in failure of the traditional overcurrent based fault detection at the point of interconnection (POI) of IIDERs. This paper focuses on other strategies of detection, namely, 1) using the transient content at the inverter output, 2) using zero sequence current magnitude at the...
The internal overvoltage is one of the key technical problems for half-wavelength AC transmission (HWACT). It is a short time for arresters to have low resistance, and the influence of arresters in the HWACT line can be neglected. Therefore, arresters can be used as an option of the suppression of transient overvoltage in HWACT lines. In this paper, an optimal arrangement scheme of arresters along...
In this paper we propose an estimator of solar radiation and a heuristic radiation selector to design a solar radiation Fault Tolerant Model Predictive Control strategy for solar trough plants. The complete design of the control system proposed has been simulated using the model of ACUREX solar trough plant at the Plataforma Solar de Almería (PSA) using a Gain Scheduling Generalized Predictive Control(GS-GPC)...
Fault security indicates ability to provide error detection or fetching the correct output. Generation (design space exploration (DSE)) of an optimal fault secured datapath structure based on user power-delay budget during high level synthesis (HLS) in the context k-cycle transient fault is considered an intractable problem. This is due to the fact that for every type of candidate design solution...
A short circuit fault in an AC railway supply system could have undesired consequences; including high-amplitude current flow in the power path, the rail potential rise in the fault vicinity. This paper studies the problem of the rail voltage rise in Tehran-Karaj railway system by the use of a steady state circuit model for the AC autotransformer during a phase-to-ground fault. By using this model,...
This paper presents a novel exploration process of an optimal fault tolerant data path based on user specified power and delay budget during high level synthesis (HLS) that is capable of masking error occurred through single and multi cycle transient faults. The exploration framework is driven through bio-mimicking of E. Coli bacterium lifecycle. The major novelties of this approach are as follows:...
Embedded systems as well as real-time kernels for their construction are sensitive to transient and other faults, each of which can lead to various errors at various system levels and can potentially result in the system failure. In existing works, sensitivity to transient SEU errors was studied only with the goal to classify SEU impacts to the system behavior. In this paper, the study is extended...
Full converter wind turbines respond differently than directly-connected machines to short circuits. In distinction with directly-connected machines, full-converter wind turbines have a controlled response to system short circuits. Consequently, they do not behave quite like a voltage behind a reactance, as conventional machines do. Also, they do not have a sequence representation in the negative...
Series faults are self-sustained arcs produced in series with the normal path of supply power. The electromagnetic transients produced by these series faults are of interest during the design and analysis of existing and forthcoming dc microgrids. This paper presents a preliminary series fault simulation model to predict the electromagnetic transients introduced by series faults. Experimental results...
Full converter wind turbines respond somewhat differently than directly-connected machines to short circuit conditions. In distinction with directly-connected machines, full-converter wind turbines have a controlled response to system short circuits. Consequently, they do not behave quite like a voltage behind a reactance, as conventional synchronous or asynchronous machines do. Also, they do not...
Lightning stroke on line may lead to mal-operation of relay protection, possibly invades substation, and further results in over-voltage of system. A S-transform based method for monitoring and identifying lightning inrush in substations is proposed in this paper. By monitoring busbar voltage signals in real-time, the waveform characteristics of transient voltage signals in both time domain and frequency...
Static load which is known for three different characteristics i.e. constant power, constant current and constant impedance shows a different voltage profile because both of their real power and reactive power vary differently as the voltage varies except for constant power. This paper will analyze the impact of each load characteristic individually and also as combination on voltage stability of...
Mathematical Morphology (MM) has been discussed in recent literature for its possible applications in power systems. However, the application of MM as a real-time filtering tool in power systems has not been explored adequately. This paper reports further contributions to our previous efforts in this direction. The paper shows how an appropriate choice of the structuring element (SE) can help develop...
Modern numerical relays have substantially reduced false operation of overcurrent relays used for capacitor protection. However, faster and more reliable operation can be useful. This paper proposes a morphological filter for fast and clear distinction between fault currents and switching currents that can benefit all types of overcurrent relays used for protection of capacitor banks. The filter performance...
For a number of years products are being impacted by transient faults that cause the systems to fail and returned to suppliers as returned material authorization (RMA). After further analysis, they deemed to be good and no problem found and ultimately sent back out to potential customers and replacements. These returns are most likely being caused by Single Event Upsets. The phenomenon of Single Event...
With the increase in the number of static synchronous compensator (STATCOM) type FACTS devices in transmission lines, transient behavior of power transmission systems in presence of fault accuracy are affected, that is due to the impacts of these devices on operation of relays during fault clearing. It is very important that the distance relays do not malfunction under system fault conditions, as...
Multi-loop theory is the most common and effective method used for analyzing stator winding internal faults of synchronous generators. Based on the current analysis methods, this paper modifies the existing models and introduces the motion equation of rotor into the multi-loop analysis model to describe the associated relations between main parameters (e.g. current, voltage, torque, speed of rotation)...
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