AM	Attention mechanism
ANN	Artificial neural networks
AR	Auto regressive
ARIMA	Auto regressive integrated moving average
ARIMAX	Auto regressive integrated moving average
ARMA	Auto regressive moving average
BPNN	Back propagation neural network
CNN	Convolutional neural network
CONV	Convolution operation
CSO	Competitive swarm optimization
DGCA	Deep convolutional generative adversarial network
DIFPSO	Particle swarm optimization algorithm based on dynamic inertia factor
EGWO	Enhanced Gray wolf optimization
GA	Genetic algorithm optimization
GFM	Generalized fuzzy model
GHI	Global horizontal irradiation
GRUP	Gated recurrent unit pool
GWO	Grey wolf optimization
IGIVA	Improved grey ideal value approximation
IVMD	Improved variational mode decomposition
KF	Kalman filter
LGBM	Light gradient boosting machine
LSTM	Long short-term memory neural network
MED	Multivariate empirical mode decomposition
MLP	Multilayer perceptron network
NA	Noise-assisted
NN	Neural network
NWP	Numerical weather prediction
PI	Prediction interval
PSO	Particle swarm optimization
PV	Photovoltaic system
RBF	Radial basis function neural network
RNN	Recurrent neural network
SVM	Support vector machine
FS	Forecast skill
SVR	Support vector regression
IMF	Intrinsic mode function
WT	Wavelet transform
WOA	Whale optimization algorithm
WD	Wavelet decomposition
WPD	Wavelet packet decomposition
EMD	Empirical mode decomposition
SCA	Sine cosine algorithm
PCA	Principal component analysis
GBM	Gradient boosting machine
GRU	Gated recurrent unit
ML	Machine learning
MSE	Mean Squared Error
MAE	Mean absolute error
RMSE	Root mean square error
DHOA	Deer hunting optimization algorithm
R	Pearson correlation coefficient
s	Skill score
DL	Deep Learning
FE	Forecasting error
FOS	Flock-of-starlings optimization
ALO	Ant Lion optimization
ELM	Extreme learning machine
PDPP	Principles under a partial daily pattern prediction
IDBN	Improved deep belief network
VARX	Vector autoregressive model with Exogenous variables
QRLSTM	Quantile regression long short-term memory
VMD	Variational mode decomposition
PSFV	Prediction of Photovoltaic system
TS	Temporal series