1)model is proposed with internal variable parameters identification to improve the precision of the traditional GM(1
1)model for electricity price forecasting in power markets. The intensional expressions that describe the nonlinear relations between internal variable parameters(such as developing coefficients
the grey inputs
the background weight parameters
and the boundary-values)and forecasting values are deduced. Then the particle swarm optimization algorithm(PSO)is adopted to identify the internal parameters. The optimal solution to the model is obtained and the PSOGM(1
1)model is generated. Comparisons with the traditional GM(1
1)model show that the PSOGM(1
1)model provides faster convergence rate and better prediction precision. Numerical results on the historical data of NORDPOOL power market show that the average precision of the PSOGM(1
1)model is 94% for short-term price forecasting
and is 1% to 3% higher than the traditional GM(1
1)model and other typical improved GM(1
1)models.
关键词
Keywords
references
DENG Julong.The control problem of grey systems[J]. Systems and Control Letters, 1982,11(5):285-294.
DU Songhuai, HOU Zhijian, JIANG Chuanwen.A new short-term grey forecasting procedure of spot price [J].Journal of Grey System, 2002, 14(4):351-358.
MA Xin, HOU Zhijian, JIANG Chuanwen.Grey forecasting electricity forward price [J].Journal of Grey System, 2003, 15(3):263-266.
CHENG Xiaoxin, ZHOU Yuhui. Research on electricity price prediction based on improved grey model [J]. Journal of North China Electric Power University, 2006, 33(1):47-50.
WU Xinghua, ZHOU Hui. A grey model of electricity price forecasting based on period residual modification [J]. Power System Technology, 2008, 32(8):67-70.
TAN Guanjun.The structure method and application of background value in grey system GM(1,1)model(Ⅰ)[J].Systems Engineering-Theory Practice, 2000, 3(4):98-103.
DONG Fenyi, TIAN Jun.Optimization integrated background value with original condition for GM(1,1)[J].Systems Engineering and Electronics, 2007,29(3):464-466.
KENNEDY J, EBERHART R C. Particle swarm optimization [C]∥Proc IEEE Int Conf Neural Networks. Piscataway, NJ,USA: IEEE Press, 1995:1942-1948.
CHEN Guimin, JIA Jianyuan, HAN Qi. Study on the strategy of decreasing inertial weight in particle swarm optimization algorithm [J].Journal of Xi'an Jiaotong University,2006,40(1):53-56.