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Artificial Hummingbird Algorithm-based fault location optimization for transmission line
Journal of Engineering and Applied Science volume 71, Article number: 149 (2024)
Abstract
Transmission is an important aspect regarding an effective designing of electric supply system. Ensuring reliable and fault-free transmission from the source for effective distribution to the end consumers is very much desirable. In this respect, fast and accurate fault detection, particularly in the overhead transmission lines, is very pertinent. Various algorithms and novel approaches have been formulated by various researchers aligned to this challenge. In this context, a new algorithm influenced by the biotic procedure of flight skills of hummingbird seems to be one of the best algorithms to address the cited problem. This paper focuses on the formulation of this Artificial Hummingbird Algorithm (AHA) and its high accuracy in ameliorating the fault location in transmission line. The most common flight skills being used in the algorithm are foraging schemes, which includes axial, diagonal, and omnidirectional flights. The proposed AHA has been tested using the Simulink prototype in MATLAB for an overhead transmission line having a length of 300 km and system voltage of 400 kV at suitable lengths. Specimen signal of voltages and currents waveforms has been taken at duo ends of the overhead transmission line. The results of the proposed algorithm have been compared with the results obtained from previous studies, and it has been observed that this algorithm yields better results for various kinds of asymmetrical and symmetrical faults.
Introduction
One of the most important factors for efficient designing of an electric power system is the precise and fast detection of faults in the transmission line. Researchers and academicians along with industry persons, all across the globe, have carried out various studies regarding different methods for an effective designing of a power system. The main objective of their studies is centered around the most rapid and precise detection of faults in the transmission lines. Regarding locating the location of faults, [1,2,3,4,5,6,7,8,9,10] have all conducted studies to confirm the effective location of faults.
In general, fault locating algorithms which are applied are broadly categorized into two groups. In the first group, potential and ampere signals are evaluated only at single end [1,2,3]. In the second group, potential and ampere signals have been evaluated at duo ends of the line [4, 11]. The findings of the studies have indeed put forth the need for a better algorithm to be framed for addressing the problem. In this regard, a novel optimization algorithm stimulated by biological instinct of hummingbirds, known as AHA, has been elaborately discussed in the current study. Researchers, namely Zhao [12] and Ramadan [13], have effectively applied the AHA for engineering design case studies and accurate models for solar cell systems, respectively, and their findings have reported that AHA yields excellent results compared to the other methods used. The hazards associated with the overhead lines are magnified by their ubiquitous exposure to the atmosphere and to different natural disturbances and inherited short circuit faults. The proposed AHA in the study functions as the fault locator and works to readily identify the fault point and thereby to improve the reliability and performance of the power system. This is even more so important to justify a sturdy transient detecting system [14]. Generally, applied techniques for fault location can be categorized mainly as follows:
- i)
- ii)
-
iii)
Methods dependent on the higher frequency constituents of potentials and amperes caused by symmetrical and unsymmetrical faults on transmission line, known as faults-based methods [23, 24].
-
iv)
Intelligent retrieval grounded techniques like artificial neural networks (ANN), machine learning [25], support vector regression [26], genetic algorithm (GA) [27], and deep learning [28,29,30,31,32]
- v)
- vi)
All the methods mentioned above suffer from some kind of drawbacks based on particular constraints as far as fault locating is concerned. The proposed AHA is based on three flying and foraging skills of hummingbirds, which encompasses all the technical attributes required regarding the effective location of faults and thereby to address them subsequently.
The study reports on the findings using the stated AHA with previous studies conducted using the other fault location techniques mentioned above and justify the higher acceptability and accuracy of AHA in comparison to them.
Throughout the past several decades, various optimization techniques have been developed for solving the loads of optimization challenges in various fields of day-to-day life [37, 38]. In contemporary years, nevertheless, the complexity of actual optimization issues has turned up considerably with the growth of human community and present industry operations. Principally, the current optimization methodologies can be characterized into deterministic and metaheuristic algorithm (routines).
Deterministic routines are particular arithmetical algorithms and functions cyclically and repetitively devoid of any unpredictable characteristics. On a stated problem, a deterministic approach invariably acquires the identical result for a specific information.
The metaheuristic algorithm has merits which enable this algorithm to efficiently search universal optimal answers to given challenges that deterministic methods cannot answer. Bioinspired algorithms have attained the maximum acceleration among these methods and are progressively implemented on different engineering problems successfully [39,40,41,42]
Methods
Aim of the study
The main aim of the study is to find the accurate location of the fault point.
Design of the study
For solving the challenge of accurate fault location, first of all, Simulink model of the transmission line is constructed in MATLAB as shown in Fig. 3A and explained in “Simulink model” section. To optimize the fault location point, a fitness function is formulated on the basis of travelling wave theory. The difference of the voltage at the fault point as seen from sending end and receiving end should be zero. Considering this fact, fitness function is formulated on the basis of the equations for the voltage at the sending end and receiving end as explained in the “Formulation of fitness function” section. These equations are constructed on the principle of travelling wave theory as explained in the “Formulation of fitness function” section. The voltage at the sending end and receiving end is illustrated in Eqs. (10) and (11). AHA is used to optimize the fault location point. The algorithm is run in MATLAB.
Methodology used
The methodology used including the introduction to the algorithm used is explained in subsequent “Artificial Hummingbird Algorithm (AHA)” and “Results and discussion” sections. All the required signals are taken from the Simulink model after running the required programs in MATLAB.
Artificial Hummingbird Algorithm (AHA)
Introduction to the algorithm
This algorithm is inspired by biological process, rooted on intellectual conducts of hummingbirds. The hummingbirds by virtue of their ease in mobility are capable of moving from one location to the other at a ready pace; also, the locations once visited (called the hunt areas) are retained in their memories. They efficiently remember the information about individual florets for a particular area counting the location of flower, quality of the nectar, and the time they travelled to the flower. Keeping all these information, hummingbirds decide where to visit next for their nourishment and refrain from returning to recently visited flowers. Three main foraging models of hummingbirds, which includes guided foraging, territorial foraging, and migration foraging, are explained as follows [12].
Guided foraging
The arithmetical equation imitating the guided foraging is formulated as follows:
where x1i(t) denotes the position of ith meal origin at time t and x1i,tar(t) is the point of the desired meal source that the ith hummingbird aspires to travel and where a1 is a directed component.
Territorial foraging
The following equation illustrates the local hunt of hummingbirds in the territorial foraging strategy:
where b1 is a factor related with territory.
Migration foraging
The arithmetical equation for the migration foraging of a hummingbird is denoted as follows:
where xwor is the food origin with the poorest rate of nectar replenishment, r is a random factor, and up and low are the upper and lower limit ranges, respectively.
The fitness function forms the basis of the algorithm which is explained in the following section.
Formulation of fitness function
The proposed AHA is based primarily on the formulation of fitness function which serves as the platform for optimization to arrive precisely and readily at the fault location in the transmission line. Figure 1 represents the single-phase prototype of a three-phase transmission line assuming distributed parameters [43, 44]. AS and AR represent the voltage sources at sending terminal and the receiving terminal respectively of phase A in Fig. 1 [45].
The distributed model of transmission line from sending end (S) to fault point (F) segment of the transmission wire is reflected in Fig. 2.
The following equations are obtained in accordance with Fig. 2 [46].
Ir and Ix in Eqs. (6) and (7) represent dependant current sources respectively and are defined as follows:
where
τ = Time elapsed for the wave to propagate from sending terminal to fault terminal.
Zc = Characteristic impedance of transmission wire.
R.’ = Resistance of line from sending end(S) to fault point (F)
Cancelling the current ix from Eqs. (6, 7, 8 and 9) the voltage at the point of fault location can be formulated as function of sending end voltage and current as in Eq. (10).
Similarly, the voltage at the point of fault location can be formulated as function of receiving end voltage and current as in Eq. (11).
where:
T = Time taken for the wave to propagate from sending terminal (S) to receiving terminal (R)
Rr = Line resistance from receiving end (R) to fault point (F)
The voltage at the point of occurrence of fault should be lone in any instance of the data utilized for the calculation [47]. In view of this, the two extracted voltages must be equivalent at all times. As the potential through the overhead wire is continual, Eqs. (10) and (11) can be merged leading to the following equation
Equation (12) ought to be correct as the variation between the voltages must be zero. Where the function F is defined as follows:
Equation (13) is the fitness function which has to be minimized to assess the point of fault. In this paper, the fitness function is minimized utilizing AHA.
Simulink model
The Simulink model of the system as shown in Fig. 3 below is simulated in MATLAB. The sending end and receiving end voltage and current signals from this model are used in fitness function which is formulated in Eq. 13 and subsequently for running of AHA.
Results and discussion
Suggested method
In this proposed study, AHA is run in MATLAB to get the fault point on the basis of formulated objective function. The Simulink of the network being investigated is illustrated in Fig. 3. The single-line diagram of the system is shown in Fig. 4 below.
The parameters of transmission line are denoted in Table 1 [48]. The nominal voltage of power system is 400 kV with system frequency as 50 HZ. Phase angle difference between sending end and receiving end voltage sources is 25°. The error % is calculated as per the formula given in Eq. (14).
where:
XCALCULATED is the calculated location
XREAL is real location
L is total length of line
Various cases of faults at different spans have been simulated, which have been reported in the subsequent sections.
Impact of fault type and location
Various kinds of faults simulated are phase A to ground (A-G), phase B to ground (B-G), phase C to ground (C-G), phase A to phase B to ground (AB-G), phase B to phase C to ground (BC-G), phase C to phase A to ground (CA-G), and phase A to phase B to phase C to ground (ABC-G) with value of fault resistance as 0.00001 Ω. Results for localization of fault in transmission line are presented in Tables 2, 3, 4, and 5.
Figure 5 shows the current waveform for A-G fault, occurring at a distance of 10 km from the sending end, having fault resistance value of 0.00001Ω.
Impact of resistance of fault
Resistance of fault is a very important parameter which influences the correctness of methods for fault location. Hence, to estimate the influence of resistance of fault, simulations have been performed for numerous fault resistances (10, 50, and 100 Ω) with several fault types. Tables 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and 17 show the respective results. Figure 6 shows the current waveform for B-G fault, occurring at a distance of 50 km from the sending point having fault resistance value as 10 Ω.
Fitness graphs for AB-G fault occurring at a distance of 10 km from sending point side with fault resistance of 10 Ω and for ABC-G fault, occurring at 200-km distance from the sending point, and bearing fault resistance value of 50 Ω are shown in Figs. 7 and 8, respectively.
Comparison with other studies
Takagi et al. [2] conducted the fault localization study and found that maximum and minimum error is 2.6% and 0.6%, respectively. Girgis et al. [4] reported that when electromagnetic transient program (EMTP) is used for locating the fault point, the maximum value of the error is less than 1%. The maximal fault location errors observed in the study conducted by Mustari et al. [49] and Lavand et al. [50] are 1.5% and 1%, respectively. A. Sanad Ahmed et al. [47] concluded that by using GA method with the value of fault resistance being 10 Ω, the maximum value of percentage error is 0.13% and with fault resistance value of 50 Ω is 0.068%. A. Sanad Ahmed et al. [47] concluded that by using Harmonic Search method (HS) with fault resistance value of 10 Ω, the maximum value of percentage error is 0.178% and with fault resistance of 50 Ω is 0.39%. A. Sanad Ahmed et al. [47] also concluded that by using method of teaching-learning-based optimization (TLBO) with fault resistance of 10 Ω, the maximum value of percentage error is 0.13% and with fault resistance of 50 Ω is 0.833%. Contrarily in the presented study, as established from Tables 2, 3, 4, and 5 with fault resistance value 0.00001 Ω, the maximum magnitude of the absolute of the % age error in fault location is 0.03%, and with varying fault resistances, the study reveals from Tables 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and 17, the maximum magnitude of the absolute of % age error in fault location is 0.04%. Consequently, higher precision is acquired for the exhibited algorithm compared to the earlier revealed studies. It is also concluded that preciseness of location is hardly affected by kind of transient (fault) and fault resistance.
Conclusions
Precise and fast detection of fault locations form an intrinsic part of an effective transmission line design, and it is directly related to the efficiency associated with it. Previous studies conducted show that the percentage error obtained is higher in magnitude for the methods adopted in them compared to the method suggested in this paper. Hence, the method suggested in the study offers highly accurate diagnosis of fault locations in the transmission line.
Availability of data and materials
The data whatever support the recommendations of this calculation are accessible against the concerning author over justifiable demand.
Abbreviations
- AHA:
-
Artificial Hummingbird Algorithm
- ANN:
-
Artificial neural networks
- A-G:
-
Phase A to ground
- B-G:
-
Phase B to ground
- C-G:
-
Phase C to ground
- AB-G:
-
Phase A to phase B to ground
- BC-G:
-
Phase B to phase C to ground
- ACG:
-
Phase A to phase C to ground
- ABC-G:
-
Phase A to phase B to phase C to ground
- GA:
-
Genetic algorithm
- HS:
-
Harmonic search
- TLBO:
-
Teaching-learning-based optimization
- EMTP:
-
Electromagnetic transient program
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Acknowledgements
The author acknowledges the effort of Prof. Bikash Patel of Kalyani Government Engineering College, Department of Electrical Engineering, for his valuable guidance in this study.
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SV conducted the literature review. Based on the review and the previous study formulated, the transmission line model in Simulink calculated the required parameters and formulated the required equations. PR formulated and designed the required MATLAB program based on AHA and proposed Simulink model of transmission line and the formulated equations. He is a vital contributor in writing the manuscript. BM executed the various simulations for the offered Simulink model at diverse locations with varied fault cases for different values of fault resistances. IM analyzed and interpreted the results of fault localization with the previous study. All authors have thoroughly read and approved the manuscript.
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Verma, S., Roy, P.K., Mandal, B. et al. Artificial Hummingbird Algorithm-based fault location optimization for transmission line. J. Eng. Appl. Sci. 71, 149 (2024). https://doi.org/10.1186/s44147-024-00475-x
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DOI: https://doi.org/10.1186/s44147-024-00475-x