Performance comparison of LOE protection of synchronous generator in the presence of UPFC

Ebrahimi, Seyed Yaser; Ghorbani, Amir

doi:10.1016/j.jestch.2015.07.003

Cited by 13 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These devices cause mal-operation of LOE relay and make it under-reached in some cases. The LOE relay under-reaching depends on the partial and complete loss of excitation, and it also depends on the selected protection scheme of the relay [18]. += , the seen impedance in the presence of UPFC is achieved by…”

Section: Impact Of Upfc On R-x Measurement Schemementioning

confidence: 99%

“…Since the presence of FACTS devices in the transmission line compensate the line impedance, they can affect the impedance-based schemes of some numerical relays such as LOE relays and distance relays. In [18], the impact of UPFC on the LOE relay is analyzed. Presence of UPFC in a transmission line could change voltage and current at the LOE relay location and lead to mal-operation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

Moravej¹,

Rasooli²,

Pazoki³

2019

ijeei

View full text Add to dashboard Cite

The advantages of using flexible AC transmission system devices increase the penetration of these devices in the existing power systems, but it is necessary to reconsider the protection schemes of a compensated network. This paper investigates four conventional schemes of loss of excitation (LOE) protection, which is used in the commercial relays, in the presence of Unified Power Flow Controller (UPFC) by both analytical and simulation approaches. The first scheme is based on the capability curve of the synchronous generator. The second scheme is the admittance-based method. The third scheme uses two double circled diagrams with a negative offset. The fourth scheme uses doubled circle diagram with a positive offset and directional element. This paper compares and evaluates the performance of these schemes in precise detail. In addition to LOE, the impact of partial loss of excitation, external fault and power swing on the LOE relay in the presence of UPFC is investigated.

show abstract

Section: Impact Of Upfc On R-x Measurement Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

Moravej¹,

Rasooli²,

Pazoki³

2019

ijeei

View full text Add to dashboard Cite

show abstract

“…The simulations were conducted using MATLAB software. Ebrahimi and Ghorbani (10) analyzed and investigated only the effect of Unified Power Flow Controller (UPFC) as one of the parallel FACTS devices. The impact of one of the shunt FACTS devices (STATCOM) was studied by Mati and Bentarzi (11).…”

Section: Introductionmentioning

confidence: 99%

A Protection for Loss of Field in Synchronous Generator in Presence of Series Compensation Capacitor

Noori,

Yaghobi

2024

IJE

View full text Add to dashboard Cite

In this research, a new approach to safeguard against Loss of Field (LOF) in a synchronous generator, in the presence of a series compensation capacitor, is introduced. LOF can lead to detrimental effects on both the generator and the power network. Impedance-based negative and positive offset MHO relays are employed for the rapid recognition of LOE occurrences in the network. However, issues arise when a series compensation capacitor is integrated into the system, causing maloperation of the protection relays. The introduction of the series compensation capacitor alters the total impedance value, necessitating adjustments to the relay settings for precise functionality. The variation in the overall impedance of the system leads to the underreaching and overreaching of a relay. The study provides detailed explanations and comparisons of both types of MHO relays, along with their respective settings. A simulation is applied in DIGSILENT to assess the effect of series compensation capacitors on offset MHO (negative and positive) relay LOF protection. Ultimately, the article concludes by summarizing the pros and cons of both relay schemes.

show abstract

“…Moreover, undesirable effects maybe observed in the LOF protection, while the compensated transmission lines by flexible AC transmission system are connected to the generator [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fast and secure detection technique for loss of field occurrence in synchronous generators

Hasani¹,

Haghjoo²

2017

IET Electric Power Applications

View full text Add to dashboard Cite

Loss of field (LOF) phenomenon in synchronous generators may cause serious damages and voltage drop in the power system, which can result in a blackout. Conventional methods, which detect LOF on the basis of the measured impedance from terminal viewpoint, are slow and may exhibit mal-operation in the face of other phenomena, e.g. stable power swing (SPS). In this paper, a novel technique is proposed to detect LOF in synchronous generators on the basis of some electrical quantities variations including voltage of terminal (V), current (I), active power (P), reactive power (Q) and power angle (δ). To evaluate the performance of the proposed algorithm, some cases are simulated under various operation conditions. Obtained results show that this algorithm on the basis of V, Q and δ not only can be considered as a fast LOF detector in comparison with the conventional impedance-based schemes, but also it is a robust and secure technique in the face of SPS and other power system disturbances. The proposed algorithm is tested by using an experimental setup including the laboratory synchronous generators, too. The obtained results show that the proposed technique can exhibit suitable performance in the actual conditions.

show abstract

Performance comparison of LOE protection of synchronous generator in the presence of UPFC

Cited by 13 publications

References 21 publications

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

Analysis of Loss of Excitation Protection Schemes of Synchronous Generators in A Compensated Transmission Line with UPFC

A Protection for Loss of Field in Synchronous Generator in Presence of Series Compensation Capacitor

Fast and secure detection technique for loss of field occurrence in synchronous generators

Contact Info

Product

Resources

About