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The more-electric aircraft concept (MEA) is one of the major trends in modern aircraft electric power system (EPS) engineering. The concept results in a significantly increased number of onboard loads driven by power-electronics. Development of appropriate EPS architectures, ensuring the power system integrity and assessment of overall system quality and performance under possible normal and abnormal...
This paper illustrates how Kalman filters were used in a model-based fault diagnosis of a DC-DC boost converter. A time-averaging model was used with the Kalman filters to generate residual signals. Multiple signature faults were developed in fault scenarios to identify critical variations in the elements of a power converter using the adaptive estimation technique. Results show a very precise and...
In order to compensate the worldwide energy consumption that is still rising, the wind energy is becoming more and more important. For this reason, the analysis of wind energy conversion systems, in which the occurrence of faults has a high negative impact, becomes a very important issue. Considering this, the aim of this paper is to present some diagnostic methods for open-circuit faults in the two...
In this paper a stator fault detection method based on monitoring of the phase shift between the line currents and phase voltages of the converter-fed induction motor is presented. The phase shift analysis is used as an indicator of the stator-fault-progression level. The mathematical model of induction motor, which includes the stator-winding fault is presented. The fault level is modeled by change...
The reliability of the PMSM drives is the one of critical factors in several industries, in particularly, the areas where the precise operation and/or high performance are required. This paper proposes a novel diagnosis scheme using Extend Kalman Filter (EKF), especially, in subject to the open-phase faults of the inverter switches. The stator resistances of PMSM are estimated by the EKF in real time...
The stator inter-turn faults and stator electrical asymmetries such as stator resistance and inductance unbalance generate similar negative sequence current signatures in the induction machine. Hence the stator inter-turn fault is one of the most difficult faults to discriminate and detect in an induction machine. Discrimination of the stator inter-turn fault from stator electrical asymmetry essentially...
So as to reduce size, volume, weight and increase efficiency of power supplies for electrical sequential loads, authors propose to analyze functioning and disfunctioning of two converter topologies: inverter + power sharing system; matrix converter. A system with two electrical machines is analyzed through simulations from the control point of view and the design point of view considering over-current...
In this paper, an online fault diagnosis technique suitable for wind-based variable speed PM generators is proposed. This floating-space-vector technique is developed based upon space-vector concepts, and its mathematical formulation is elaborated in this paper. The technique is verified numerically as well as experimentally using a 7.2kW PM machine as a wind generator. The numerical model is based...
A 5-level PFC topology with fault-diagnostic and fault-tolerant capability is proposed and compared to known structures. It is derived from a 3-level non differential double-boost PFC including fly-cap cells. The series-connection of the two low-voltage switching-cells is decoupled by a single flying capacitor that provides a direct fault-tolerant capability and a post-failure operation increasing...
Safety issues and the dependence of numerous systems on electronics are rapidly increasing the concern over fault tolerance. As an example, an intelligent vehicle with electronically controlled x-by-wire systems composed of dynamically configurable electronic elements instead of rigid mechanical components must be fault tolerant because a devastating failure could occur without warning. In particular,...
Nonlinear loads as grid connected converters can cause, besides the generation of several current harmonics in the grid current, a DC current component injection. A DC current component can cause the magnetic core saturation of distribution power transformers. Transformers operating under saturation conditions present increased power losses, overheating and distorted current waveforms. Since a DC...
This paper focuses on the modeling, controller design, simulation and analysis of a two-string photovoltaic (PV) and storage system connected to grid via a centralized nine-switch three-level inverter. A circuit-based PV array model is presented for use. A boost converter is employed to enable PV to operate at its maximum power point. The storage system consists of a capacitor bank connected at the...
Due to the communication technologies' involvement in the distribution power system, the time-critical protection function may be implemented more accurately, therefore distribution power systems' stability, reliability and security could be improved. This paper presents an active distribution power system, including CHPs (Combined Heating and Power) and small scaled WTs (Wind Turbines), as a practical...
In our earlier paper, we proposed a new “Intelligent Operation” concept for high voltage SF6 gas circuit breakers, in which the moving contacts are self-adaptively controlled according to the system condition to optimize the breaking performance. To analyze and design the operation, a new model of high voltage SF6 gas circuit breaker is developed, and the moving characteristics of the new smart breaker...
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