Papers by hashem mortazavi
This contribution deals with the analysis of synchronous generator loss of excitation (LOE) prote... more This contribution deals with the analysis of synchronous generator loss of excitation (LOE) protection. This paper presents a new method for detecting LOE in synchronous generator based on the variation of the magnetic flux linkage in the air gap. To show the effectiveness of the proposed protection, comparisons
are made with the conventional LOE protection methods by considering different generator sizes. The simulation results show that the proposed method is useful and effective to detect LOE conditions. The main advantage of this method is its speed and sensitivity.
In this paper a new challenge about the reactive
capability curves of the synchronous generator ... more In this paper a new challenge about the reactive
capability curves of the synchronous generator is discussed. The
behavior of generators with respect to the generation of the
reactive power is provided by the reactive capability curves. The
reactive capability curves are a graphical representation of the
reactive and real power produced by the generators under
various operating conditions, as specified by the cold gas pressure
and temperature inside the generators as well as the power factor.
These curves define the normal limits of operation without
exceeding thermal limitations. Manufactures of the generators
provide the estimated reactive capability curves. However, as
generators are used, over time the actual reactive capability
curves of the generators would deviate from the estimated curves.
Therefore, it is necessary for the optimal dispatch of the reactive
and active power, that the mentioned variations to be considered.
This paper discusses about some reasons, which lead to the
variations, and then introduces methods for determining new
capability curves.
… on Electrical Power, Jan 1, 2012
This contribution deals with the analysis of synchronous generator loss of excitation (LOE) prote... more This contribution deals with the analysis of synchronous generator loss of excitation (LOE) protection. This paper presents a new method for detecting LOE in synchronous generator based on the variation of the magnetic flux linkage in the air gap. To show the effectiveness of the proposed protection, comparisons are made with the conventional LOE protection methods by considering different generator sizes. The simulation results show that the proposed method is useful and effective to detect LOE conditions. The main advantage of this method is its speed and sensitivity.
… ), 2011 IEEE Student …, Jan 1, 2011
In this paper, improving in transient stability is made through a development of new approach. Si... more In this paper, improving in transient stability is made through a development of new approach. Since the maximum use of existing capacities along with the increased powers transferred through the transition lines make transient stability studies even more important. Generator tripping is one of the most effective methods that remedy to stability in case of severe faults. In this method, a number of units of a certain unit are disconnected as a way of making the system works steadily. The braking resistor is less efficient than generator tripping for transient stability. In the proposed method, system stability against severe turbulence is tackled with minimum tripping of generator units. At this proposal, the intensity of fault will be valuably lessen by applying braking resistor, and then, for the purpose of improving transient stability, the kinetic energy is reduced by removing certain unit at the right time. The approach has been tested on 9bus with 3-generator system to demonstrate promising effects.
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Papers by hashem mortazavi
are made with the conventional LOE protection methods by considering different generator sizes. The simulation results show that the proposed method is useful and effective to detect LOE conditions. The main advantage of this method is its speed and sensitivity.
capability curves of the synchronous generator is discussed. The
behavior of generators with respect to the generation of the
reactive power is provided by the reactive capability curves. The
reactive capability curves are a graphical representation of the
reactive and real power produced by the generators under
various operating conditions, as specified by the cold gas pressure
and temperature inside the generators as well as the power factor.
These curves define the normal limits of operation without
exceeding thermal limitations. Manufactures of the generators
provide the estimated reactive capability curves. However, as
generators are used, over time the actual reactive capability
curves of the generators would deviate from the estimated curves.
Therefore, it is necessary for the optimal dispatch of the reactive
and active power, that the mentioned variations to be considered.
This paper discusses about some reasons, which lead to the
variations, and then introduces methods for determining new
capability curves.
are made with the conventional LOE protection methods by considering different generator sizes. The simulation results show that the proposed method is useful and effective to detect LOE conditions. The main advantage of this method is its speed and sensitivity.
capability curves of the synchronous generator is discussed. The
behavior of generators with respect to the generation of the
reactive power is provided by the reactive capability curves. The
reactive capability curves are a graphical representation of the
reactive and real power produced by the generators under
various operating conditions, as specified by the cold gas pressure
and temperature inside the generators as well as the power factor.
These curves define the normal limits of operation without
exceeding thermal limitations. Manufactures of the generators
provide the estimated reactive capability curves. However, as
generators are used, over time the actual reactive capability
curves of the generators would deviate from the estimated curves.
Therefore, it is necessary for the optimal dispatch of the reactive
and active power, that the mentioned variations to be considered.
This paper discusses about some reasons, which lead to the
variations, and then introduces methods for determining new
capability curves.