scholarly journals Long Term Load Forecasting Based on Hybrid Model of Feed Forward Net and Modified Grey Wolf Optimization

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Peak Load ◽  
Load Forecasting ◽  
Grey Wolf ◽  
Electrical Load ◽  
Grey Wolf Optimization ◽  
Feed Forward ◽  
Training Samples ◽  
Proposed Model ◽  
Annual Total ◽  
Two Stages

This paper presents a hybrid modified grey wolf optimization (MGWO) algorithm with the feed forward net (FFN), named MGWO-FFN, for solving electrical load forecasting. The proposed model is implemented with two stages: firstly, MGWO algorithm estimates the optimum variables of the FFN through the pre-determined training samples. Then the adapted FFN is tested with the remaining other samples and is utilized to predict the electrical peak load (PL). The proposed algorithm is investigated on two real cases (i.e. predicting the annual total electrical load consumption of Beijing's city and the annual PL consumed in Egypt). To prove the superiority of the proposed algorithm, MGWO is validated by comparing with algorithm including classical GWO and PSO algorithms. Both of Beijing's and Egypt's cases results indicate that the proposed MGWO-FFN algorithm outperforms the others where less mean square error (MSE) and more accuracy are obtained compared to the error that yields using the other two algorithms.

Grey Wolf Optimization-Based Artificial Neural Network for Classification of Kidney Images

2018 ◽  
Vol 27 (14) ◽  
pp. 1850231 ◽  
Author(s):  
Paladugu Raju ◽  
Veera Malleswara Rao ◽  
Bhima Prabhakara Rao
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Kidney Diseases ◽  
Feature Subset ◽  
Grey Wolf ◽  
Grey Wolf Optimization ◽  
Feed Forward ◽  
Feed Forward Back Propagation ◽  
Artificial Neural

Ultrasound (US) imaging is the initial phase in the preliminary diagnosis for the treatment of kidney diseases, particularly to estimate kidney size, shape and position, to give information about kidney function, and to help in diagnosis of abnormalities like cysts, stones, junctional parenchyma and tumors which is shown in Figs. 7–9. This study proposes Grey Level Co-occurrence Matrix (GLCM)-based Probabilistic Principal Component Analysis (PPCA) and Artificial Neural Network (ANN) method for the classification of kidney images. Grey Wolf Optimization (GWO) is used to update the current positions of abnormal kidney images in the discrete searching space, thus getting the optimal feature subset for better classification purposes based on Feed Forward Neural Network (FFNN). The scanned image is pre-processed and the required features are extracted by GLCM, among those, some features are selected by PPCA. Feed Forward Back propagation Neural Network (FFBN) is used to classify the normalities and abnormalities in the part of kidney images. The proposed methodology is implemented in MATLAB platform and the analyzed result produces 98% accuracy using GWO-FFBN technique.

scholarly journals Electrical Daily Load Forecasting In Ramadhan Using Type-2 Fuzzy Logic In Sulselrabar System

2018 ◽  
pp. 146
Author(s):  
Marhatang Marhatang ◽  
Muhammad Ruswandi Djalal ◽  
Herman Nawir ◽  
Sonong Sonong
Keyword(s):  
Fuzzy Logic ◽  
Power Systems ◽  
Peak Load ◽  
Load Forecasting ◽  
Small Error ◽  
Electrical Load ◽  
Electricity Load ◽  
Interval Type

 This study discusses the daily electricity load forecasting 24 hours on 150 kV electric power systems sulselrabar. Forecasting electrical load requires the accuracy of the results with a small error. Peak load forecasting methods used to use smart methods Interval Type-1 Fuzzy Logic (IT1FL) and Interval Type-2 Fuzzy Logic (IT2FL) to predict the needs of the electrical load 1 Ramadan 2016. As input data, it was used load data from 2012 through 2016 for the same day each 1st of Ramadan each year, and as comparative data, it was used actual load data 1, 2016. For the Ramadan input variable, it was used two of the data Variation Load Difference (VLD Max) 2015 as an input variable X, VLD Max 2016 as an input variable Y. From the simulation results obtained highly accurate results where each method produces a very small error, where for methods of using IT1FL of 1.607778264% while using IT2FL by, 1.344510913%.

scholarly journals Short-Term Electric Load Forecasting Based on Variational Mode Decomposition and Grey Wolf Optimization

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4890
Author(s):  
Mengran Zhou ◽  
Tianyu Hu ◽  
Kai Bian ◽  
Wenhao Lai ◽  
Feng Hu ◽  
...  
Keyword(s):  
Load Forecasting ◽  
Support Vector ◽  
Electric Load ◽  
Variational Mode Decomposition ◽  
Grey Wolf ◽  
Grey Wolf Optimization ◽  
Short Term ◽  
Mode Decomposition ◽  
The Impact ◽  
Electric Load Forecasting

Short-term electric load forecasting plays a significant role in the safe and stable operation of the LO system and power market transactions. In recent years, with the development of new energy sources, more and more sources have been integrated into the grid. This has posed a serious challenge to short-term electric load forecasting. Focusing on load series with non-linear and time-varying characteristics, an approach to short-term electric load forecasting using a “decomposition and ensemble” framework is proposed in this paper. The method is verified using hourly load data from Oslo and the surrounding areas of Norway. First, the load series is decomposed into five components by variational mode decomposition (VMD). Second, a support vector regression (SVR) forecasting model is established for the five components to predict the electric load components, and the grey wolf optimization (GWO) algorithm is used to optimize the cost and gamma parameters of SVR. Finally, the predicted values of the five components are superimposed to obtain the final electric load forecasting results. In this paper, the proposed method is compared with GWO-SVR without modal decomposition and using empirical mode decomposition (EMD) to test the impact of VMD on prediction. This paper also compares the proposed method with the SVR model using VMD and other optimization algorithms. The four evaluation indexes of the proposed method are optimal: MAE is 71.65 MW, MAPE is 1.41%, MSE is 10,461.32, and R2 is 0.9834. This indicates that the proposed method has a good application prospect for short-term electric load forecasting.

scholarly journals Detection of Microaneurysms Using Grey Wolf Optimization for Early Diagnosis of Diabetic Retinopathy

2020 ◽  
Vol 13 (6) ◽  
pp. 208-218
Author(s):  
Manohar Pundikal ◽  
◽  
Mallikarjun Holi ◽  
Keyword(s):  
Diabetic Retinopathy ◽  
Early Diagnosis ◽  
Nearest Neighbor ◽  
Fundus Images ◽  
Grey Wolf ◽  
K Nearest Neighbor ◽  
Grey Wolf Optimization ◽  
Low Light ◽  
Accurate Identification ◽  
Proposed Model

The diabetic retinopathy is the leading cause of blindness worldwide, so early detection of diabetic retinopathy is necessary to reduce eye-related diseases. The accurate identification of microaneurysms is crucial for the detection of diabetic retinopathy, because it appears as the first sign of the disease. In this study, a new model is proposed to detect microaneurysms from the retinal images for early diagnosis of diabetic retinopathy. At first, the fundus images are collected from e-ophtha microaneurysms and DiaretDB1 datasets. Next, image pre-processing is accomplished using image normalization, low light image enhancement, gradient weighting and shade correction. The pre-processing methods significantly brighten the contrast of the fundus images for better visual quality and extract the hidden details of the dark conditions. In addition, Hessian based filter and Otsu threshold are used to extract the foreground objects like microaneurysms from the enhanced fundus images. At last, Grey Wolf Optimization (GWO) is used to predict the correctness of segmented microaneurysms candidates. The experimental results have revealed that the proposed model enhanced the microaneurysms detection up to 0.06-0.30 f-score value compared to the other existing models local convergence index features and local features with k-nearest neighbor. In addition, the proposed model has achieved 85.72% and 86.16% of accuracy respectively on e-ophtha microaneurysms and DiaretDB1 datasets.

scholarly journals Long-term load forecasting using grey wolf optimizer -least-squares support vector machine

2020 ◽  
Vol 9 (3) ◽  
pp. 417
Author(s):  
Z. M. Yasin ◽  
N. A. Salim ◽  
N.F.A. Aziz ◽  
Y.M. Ali ◽  
H. Mohamad
Keyword(s):  
Support Vector Machine ◽  
Peak Load ◽  
Load Forecasting ◽  
Least Square ◽  
Percentage Error ◽  
Support Vector ◽  
Grey Wolf Optimizer ◽  
Grey Wolf ◽  
Load Demand

<p><span lang="EN-US">Long term load forecasting data is important for grid expansion and power system operation. Besides, it also important to ensure the generation capacity meet electricity demand at all times. In this paper, Least-Square Support Vector Machine (LSSVM) is used to predict the long-term load demand. Four inputs are considered which are peak load demand, ambient temperature, humidity and wind speed. Total load demand is set as the output of prediction in LSSVM. In order to improve the accuracy of the LSSVM, Grey Wolf Optimizer (GWO) is hybridized to obtain the optimal parameters of LSSVM namely GWO-LSSVM. Mean Absolute Percentage Error (MAPE) is used as the quantify measurement of the prediction model. The objective of the optimization is to minimize the value of MAPE. The performance of GWO-LSSVM is compared with other methods such as LSSVM and Ant Lion Optimizer – Least-Square Support Vector Machine (ALO-LSSVM). From the results obtained, it can be concluded that GWO-LSSVM provide lower MAPE value which is 0.13% as compared to other methods.</span></p>

scholarly journals Energy Consumption Estimation of the Electric Bus Based on Grey Wolf Optimization Algorithm and Support Vector Machine Regression

2021 ◽  
Vol 13 (9) ◽  
pp. 4689
Author(s):  
Wei Qin ◽  
Linhong Wang ◽  
Yuhan Liu ◽  
Cheng Xu
Keyword(s):  
Support Vector Machine ◽  
Energy Consumption ◽  
Optimization Algorithm ◽  
Support Vector ◽  
Grey Wolf ◽  
Grey Wolf Optimization ◽  
Support Vector Machine Regression ◽  
Electric Bus ◽  
Proposed Model ◽  
The Mean

Electric buses have many significant advantages, such as zero emissions and low noise and energy consumption, making them play an important role in saving the operation cost of bus companies and reducing urban traffic pollution emissions. Therefore, in recent years, many cities in the world dedicate to promoting the electrification of public transport vehicles. Whereas due to the limitation of on-board battery capacity, the driving range of electric buses is relatively short. The accurate estimation of energy consumption on the electric bus routes is the premise of conducting bus scheduling and optimizing the layout of charging facilities. This study collected the actual operation data of three electric bus routes in Meihekou City, China, and established the support vector machine regression (SVR) model by taking the state of charge (SOC), trip travel time, mean environment temperature and air-conditioning operation time as the independent variables; while the energy consumptions of the route operations served as the dependent variables. Furthermore, the grey wolf optimization (GWO) algorithm was adopted to select the optimal parameters of the proposed model. Finally, a support vector machine regression model based on the grey wolf optimization algorithm (GWO-SVR) is proposed. Three real bus lines were taken as examples to validate the model. The results show that the mean average percentage error is 14.47% and the mean average error is 0.7776. In addition, the estimation accuracy and training time of the proposed model are superior to the genetic algorithm-back propagation neural network model and grid-search support vector machine regression model.

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