Sirindhorn International Institute of Technology
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Power System Control & Stabilization
Power system stability limitation and control problems constitute very important considerations in the planning, design and operation of modern power systems. The increasing complexity of power systems, and the financial and regulatory constraints have forced utilities to operate the systems nearly at stability limits. Greater reliance is, therefore, being placed on the use of special control aids to enhance system security, facilitate economic design, and provide greater flexibility of system operation. These motivate a new concept of power system control and stabilization based on advances in technology of power system controllers, information technology, and control theory.
The fast development of power electronics based on new and powerful semiconductor devices has led to innovative technologies, such as Flexible AC Transmission System (FACTS) and High Voltage Direct Current Transmission (HVDC), which can be applied in transmission and distribution systems. The technical and economical benefits of these technologies represent an alternative to the application in ac systems. On the other hand, deregulation in the power industry and opening of the market for delivery of cheaper energy to the customers is creating additional requirements for the operation of power systems. FACTS technology offers major advantages in meeting these challenging requirements.
Robust Control Application to Design of Power System Damping Controllers
In the interconnected-power systems, variations in system configuration due to unpredictable disturbances as well as nonlinear characteristics of power systems cause several system uncertainties. Under these situations, the high robustness of power system damping controller is significantly desired. On the other hand, the theory of robust control has significantly developed and been applied to many fields in engineering. This research takes advantages of robust control theories such as H¥ control, variable structure control, etc. to design of robust damping controllers of FACTS devices, power system stabilizers, etc.