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For economic operation of distribution system with charging stations, forecasting of charging load becomes important. Based on the load data from charging posts, the first step is to distinguish whether the time sequence is stationary or non-stationary. Then with theory of time series analysis, the dynamic model is properly constructed and is used in forecasting after the model is verified to meet...
Some analyses and researches are done about networked control systems (NCS) those are based on the new Smith predictor and internal model control (IMC) from the system structures in this paper. The research and simulation results show that the choice of strategy of the new Smith predictor is more flexible than internal model control, but the adjusting parameter of the internal model control is relatively...
On the basis of optimal control strategy, an optimal generator excitation control law based on grey prediction control algorithm is proposed. The state variable are forecasted by GM(1, N) model and the optimal feedback gain of each state variable containing prediction information is solved by means of optimal control theory, thus the optimal control value with prediction information is obtained. The...
Wind power forecasting is one of the key technical issues for a power system integrated with a large amount of wind farms. Based on analysis of the variation characteristics of wind speed, we applied econometrics theory into the modeling of wind speed, since GARCH has an excellent performance to tracing the variation of those fluctuating sequences. Using the wind power curve, the power output of a...
The daily clearing price curve in electricity market varied with multi-period and strong fluctuation characteristic. When grey GM (1, 1) model is used in forecast, the forecast error exceeded the permitted precision. This is because GM (1, 1) model is invalidated only if the price series did not follow the rule of exponential growth. In this case, grey model with period residual modification is proposed,...
Forecast of wind speed is very important for making out dispatch scheme of power system and operation in higher reliability, according to the forming mechanism of wind, its influencing factors and its inherent variation rule, one of pattern recognition called as adaptive neuron-fuzzy inference system, abbreviated as ANFIS is used in wind speed forecast. The hybrid algorithm is used to train the parameter...
The networked control system with stochastic time delays and data drop can be regarded as the grey system which involves stochastic interferences and stochastic variables.The generalized controlled object is modeled as a grey system model and it is proposed in the passage an algorithm of predictive functional control based on grey system model. The formula of how to calculate the output of predictive...
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