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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 44488 (05)
- University: Sharif University Technology
- Department: Electrical Engineering
- Advisor(s): Ranjbar, Ali Mohammad
- Abstract:
- Load frequency control (LFC) is one of the important control problems in interconnected power system design and operation, and is becoming more significant today because of the increasing size, changing structure, emerging new uncertainties, environmental constraints and the omplexity of power systems. Therefore, load frequency function requires increased performance and flexibility to ensure that it is capable of maintaining a generation-load balance, following serious disturbances.Real power systems are often large-scale systems which are composed of many interacting subsystems. Therefore, it is difficult to control such systems due to the required inherent computational complexities and reliability problems. Since several generation units may participate in an LFC task, power system LFC is a multivariable control problem. In addition, different kinds of physical limitations such as parameters uncertainty, time delay and generation rate constraints (GRCs) have major effects on the dynamic of power system LFC. These features make load frequency control a robust, time delayed, constrained and multivariable control problem.This dissertation develops four new model predictive control (MPC) designs that provide effective optimal and robust load frequency control actions. The first control design is a centralized functional model predictive control which provides coordinated control actions among control areas. The second control design relies on the robust MPC in term of linear matrix inequalities (LMIs). The third design considers time delay in LFC system. Finally, fourth control design is a supervisory control approach which provides optimality and reliability. All of the proposed methods are multivariable design and considered generation rate constraints
- Keywords:
- Load-Frequency Control ; Predictive Control ; Robust Control ; Multivariable Control ; Time Delay ; Generation Rate Constraint
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