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A closed form solution is presented for the transient and steady-state response of surface permanent magnet synchronous machines to single FET short circuit failure in the drive. PWM techniques such as sine and discontinuous switching schemes are compared with respect to the motor performance under such fault condition. With the help of the analytic model the sensitivity of the key control parameters...
This paper presents a modeling of a surface permanent magnet synchronous motor in healthy and faulty cases and a control approach aiming at reducing the torque ripple which appears in faulty case. The fault considered in this work is a stator inter-turn short circuit. The model proposed in this paper is based on the dynamic equations of the motor. Simulation results show the possibility to reduce...
Stator winding faults are one of most frequent PMSM motor damages resulting from the degradation of the inter-turn, inter-phase and main isolation of the motor winding. So this paper presents a dynamic model for PMSM with inter-turn fault. The faulty model is used for studying the machine behavior and extracting the fault signatures.
This paper presents real-time simulation results of a 512-level modular multilevel converter (MMC). Using off-the-shelf computers and FPGA boards, the converter, including the 6 valves, 6 arm inductors and the transformer, is simulated with a time-step of 450 ns. Such a small time-step is required to ensure high accuracy when applying gating signals but also when observing fault conditions. Simulation...
With fast increasing penetration of wind generation around the world, it is important to document accurate short circuit models of different types of wind turbine generators (WTGs) and wind farms. This paper documents and analyzes the short circuit response of Type 3 WTG with crowbar protection. The model is first simulated and validated using field data from a wind farm having Type 3 WTGs. PSCAD...
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...
With recent proliferation of wind farms over the world, it has become important to study the short circuit characteristics of different types of wind turbine generators (WTGs). This paper describes the short circuit characteristics of a Type-II WTG, and a wind farm comprised of this type of generators. A commercial time-domain software is used to model the WTG and the wind farm. The machine model...
Nowadays, the fault simulation is an important step in any IC design. Predicting the behavioral faults of any process step is essential to ensure that the design is well implemented. During the simulation various problems can be detected and corrected. It is presented a tool to simulate the effects that occur when a source of fault is inserted in a digital circuit, especially SEU faults. To model...
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...
Faults in transmission lines are very common and it comes along with a huge penalty from the consumer as well as from the suppliers end. A fault in a system should be dealt very firmly and fast lest it would damage other accessories along the transmission line. In this paper, a single phase fault and a three phase fault has been simulated using Alternating Transient Program (ATP) and the energy content...
Detecting and removing minor faults in power transformer winding is essential because minor faults may develop and lead to major faults and finally irretrievable damages occur. In this paper in order to detect the position of short-circuit in the winding, frequency response of the input impedance of a power transformer is analyzed. Common short-circuits are categorized and the results are compared,...
In this paper, we have introduced a new technique based on simultaneous analysis of output voltage gain vs. frequency and phase vs. frequency for fault testing of analog integrated circuits. An automated test frequency generation method is demonstrated here to select minimum number of test frequencies as stimuli. The introduced technique is applied to three benchmark circuits and the obtained results...
The distribution grid is mainly built on a radial configuration where power is coming from one transformer substation to supply clients. Up to recently, in the rare cases where distributed generation existed, it was almost exclusively constituted of rotating machines, which have quite a different behaviour under fault than inverter-based sources. Consequently, current connection impact assessments...
Rapid increase of the transmission capacity and environmental limit of the power transmission passage have indispensably promoted development of the AC/DC hybrid transmission lines on the same tower, especially for UHV systems being established in China. Unfortunately, severe electromagnetic coupling effects will inevitably exist between the UHV AC and DC transmission lines built on the same tower...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
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