The device to measuring of the load angle for salient-pole synchronous machine in education laboratory

Kaňuch, J.; Girovský, Peter

doi:10.1016/j.measurement.2017.10.043

Cited by 12 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These methods possible to localize places of faults and it can also serve for the diagnosis and detection of disorders in material quality and other anomalies during operation of the equipment [15], [16].…”

Section: Resultsmentioning

confidence: 99%

Thermal diagnostic systems and their application for analysis of transformer winding

Šebök¹,

Kučera²,

Gutten³

et al. 2019

Diagnostyka

View full text Add to dashboard Cite

This paper is focused application of chosen thermal non-contact and contact methods for quality diagnostics of the transformer windings. In the first part of the paper it examines basic principles and application of non-contact temperature measurement on power transformers by thermovision. The second part is focused on analysis of thermal processes in distribution transformer. In the finally, it is examined experimental measurement on laboratory transformer with task to detect mechanical strength and subsequently short-circuit resistance of its winding. By means of the experimental measurements and following analysis it was showed the practical thermovision and contact thermal measurement by optical detectors for diagnostics of power oil transformers in field mechanical strength of winding material.

show abstract

Section: Resultsmentioning

confidence: 99%

Thermal diagnostic systems and their application for analysis of transformer winding

Šebök¹,

Kučera²,

Gutten³

et al. 2019

Diagnostyka

View full text Add to dashboard Cite

show abstract

“…• Simplicity and Cost Factor: In the proposed strategy of this paper, the variables of V sg , P sg , and Q sg can be easily measured/calculated from the available current and voltage transformers (CT and PT) at the SG terminal, and δ sg param- eter can also be easily estimated by various methods such as an optical encoder which is connected to an encoder of a signal processor [25]. Hence, its application is simple and cost-effective.…”

Section: Comparison Of the Proposed Methods With The Conventional Imp...mentioning

confidence: 99%

“…Meanwhile, as seen from Table 4, the proposed method detects all happened events with an acceptable detection time (just within 1.6 s) than the other schemes especially the impedance‐based relay. Accuracy Factor : As can be seen in Figure 12, during the TPF with lead‐loading condition of the machine, the impedance trajectory enters into the relay zones mistakenly, giving rise to tripping the SG. While, as seen from Table 4, the provided setting‐free protection scheme of this paper does not have any wrong performance during such PSD events and as a result has an accurate performance than the other schemes. Simplicity and Cost Factor : In the proposed strategy of this paper, the variables of V sg , P sg , and Q sg can be easily measured/calculated from the available current and voltage transformers (CT and PT) at the SG terminal, and δ sg parameter can also be easily estimated by various methods such as an optical encoder which is connected to an encoder of a signal processor [25]. Hence, its application is simple and cost‐effective.…”

Section: Comparison Of the Proposed Methods With The Conventional Imp...mentioning

confidence: 99%

A multi‐variables loss of excitation protection scheme to improve the factors of accuracy and speed of detection than the conventional impedance relay

Fatolahi,

Hosseini‐Hemati,

Rastgou

et al. 2023

The Journal of Engineering

View full text Add to dashboard Cite

The most common disadvantages of loss of excitation (LOE) impedance relay are its improper operation in the conditions of power system disturbances (PSD) and its long operation time. In this regard, to solve the mentioned problems and as a result improve the accuracy and speed of detecting the LOE events, four key variables including active power (Psg), reactive power (Qsg), load angle (δsg), and terminal voltage (Vsg) are selected, on the basis of an in‐depth theoretical‐ and simulation studies. These variables have been implemented in a precise combinational logic. In the developed LOE detection logic of this paper, the dependent parameters of Vsg and Qsg as well as Psg and δsg parameters are examined simultaneously in an AND logic cluster. If both the defined combinations detect the occurrence of LOE, the generator trip command is issued. Otherwise, the normal operation of the under‐study machine will continue. The results of the performed simulations in MATLAB/Simulink environment (2017b) during the detailed scenarios of LOE and PSD events on the IEEE 39‐bus standard system confirm the efficiency of the outlined LOE protection model. Meanwhile, its superiority from the viewpoints of accuracy, swiftness, and simplicity and cost of implementation are comprehensively compared with the other schemes.

show abstract

“…The methods of determining the generator's load angle in power plants mainly consist of physical measurements. Direct load angle measurements are rarely used, while indirect measurements, utilizing rotor position information from the corresponding sensor and the information about the first harmonic of the generator terminal voltage, such as those presented in [5][6][7], are more prevalent. These methods of load angle determination require installation of additional measuring equipment, which represents additional costs, while in some systems it is even not possible to install it due to their configuration.…”

Section: Introductionmentioning

confidence: 99%

Sliding Mode Observer-Based Load Angle Estimation for Salient-Pole Wound Rotor Synchronous Generators

Lopac

Bulić

Vrkic³

2019

Energies

View full text Add to dashboard Cite

Synchronous generator load angle is a fundamental quantity for power system stability assessment, with possible real-time applications in protection and excitation control systems. Commonly used methods of load angle determination require additional measuring equipment, while existing research on load angle estimation for wound rotor synchronous generator has been limited to the estimator based on the generator’s phasor diagram and estimators based on artificial neural networks. In this paper, a load angle estimator for salient-pole wound rotor synchronous generator, based on a simple sliding mode observer (SMO) which utilizes field current, stator voltages, and stator currents measurements, is proposed. The conventional SMO structure is improved with use of hyperbolic tangent sigmoid functions, implementation of the second order low-pass filters accompanied with corresponding phase delay compensation, and introduction of an adaptive observer gain proportional to the measured field current value. Several case studies conducted on a generator connected to a power system suggest that the proposed estimator provides an adequate accuracy during active and reactive power disturbances during stable generator operation, outperforming the classical phasor diagram-based estimator by reducing mean squared error by up to 14.10%, mean absolute error by up to 41.55%, and maximum absolute error by up to 8.81%.

show abstract

The device to measuring of the load angle for salient-pole synchronous machine in education laboratory

Cited by 12 publications

References 9 publications

Thermal diagnostic systems and their application for analysis of transformer winding

Thermal diagnostic systems and their application for analysis of transformer winding

A multi‐variables loss of excitation protection scheme to improve the factors of accuracy and speed of detection than the conventional impedance relay

Sliding Mode Observer-Based Load Angle Estimation for Salient-Pole Wound Rotor Synchronous Generators

Contact Info

Product

Resources

About