Abstract
For the recent expansion of renewable energy applications, Wind Energy System (WES) is receiving much interest all over the world. However, area load change and abnormal conditions lead to mismatches in frequency and scheduled power interchanges between areas. These mismatches have to be corrected by the LFC system. This paper, therefore, proposes a new robust frequency control technique involving the combination of conventional Proportional-Integral (PI) and Model Predictive Control (MPC) controllers in the presence of wind turbines (WT). The PI-MPC technique has been designed such that the effect of the uncertainty due to governor and turbine parameters variation and load disturbance is reduced. A frequency response dynamic model of a single-area power system with an aggregated generator unit is introduced, and physical constraints of the governors and turbines are considered. The proposed technique is tested on the single-area power system, for enhancement of the network frequency quality. The validity of the proposed method is evaluated by computer simulation analyses using Matlab Simulink. The results show that, with the proposed PI-MPC combination technique, the overall closed loop system performance demonstrated robustness regardless of the presence of uncertainties due to variations of the parameters of governors and turbines, and loads disturbances. A performance comparison between the proposed control scheme, the classical PI control scheme and the MPC is carried out confirming the superiority of the proposed technique in presence of doubly fed induction generator (DFIG) WT.
Highlights
Two balances corresponding to two equilibrium points namely frequency and voltage must be maintained between generation and utilization in an electric power system
In [24] a new load frequency control (LFC) using the model predictive control (MPC) technique in the presence of wind turbines (WT) was presented and the results demonstrated that the closed-loop system with Model Predictive Control (MPC) controller is robust against the parameter perturbation of the system and has more desirable performance in comparison with classical integral control design in all of the tested scenarios
Instead of replacing the conventional controller with a robust control scheme, this paper proposes a new robust control technique involving the combination of a conventional PI controller and a robust controller, precisely, the MPC, to form a single controller known as the PI-MPC technique for power system frequency control
Summary
Two balances corresponding to two equilibrium points namely frequency and voltage must be maintained between generation and utilization in an electric power system. The applications of artificial neural network, genetic algorithms, and optimal control to LFC have been reported in [18,19] In their findings, it is observed that the transient response is oscillatory and it seems that some other elegant techniques are needed to achieve a desirable performance. In [24] a new load frequency control (LFC) using the model predictive control (MPC) technique in the presence of wind turbines (WT) was presented and the results demonstrated that the closed-loop system with MPC controller is robust against the parameter perturbation of the system and has more desirable performance in comparison with classical integral control design in all of the tested scenarios. The load frequency control for a single area power system in the presence of WES has been developed based on the PI-MPC technique.
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