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A coordinated MIMO control design for a power plant using improved sliding mode controller.

Mohammad Ataei¹, Rahmat-Allah Hooshmand¹, Siavash Golmohammadi Samani¹

¹Department of Electrical Engineering, Faculty of Engineering, University of Isfahan, Hezar-Jerib St., P. code: 8174673441, Isfahan, Iran.

ISA Transactions

|October 12, 2013

Summary

This study introduces an improved sliding mode controller (ISMC) for coordinated boiler-turbine control in steam power plants. The new system enhances network frequency regulation and steam pressure stability during load changes.

Keywords:

Boiler–turbine system Sliding mode control Steam power plant Throttle steam pressure

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Area of Science:

Engineering
Control Systems
Power Generation

Background:

Steam power plants require coordinated boiler-turbine control for effective network frequency regulation.
Lack of coordinated control leads to instability, power oscillations, and reduced unit reliability.

Purpose of the Study:

To propose and evaluate an improved sliding mode controller (ISMC) for multivariable boiler-turbine coordinated control.
To enhance the stability and performance of steam power plants in frequency regulation.

Main Methods:

Developed a comprehensive multivariable control system model for boiler-turbine subsystems.
Implemented an improved sliding mode controller (ISMC).
Validated the model and controller on a 320MW unit at Islam-Abad power plant.

Main Results:

The ISMC effectively controlled turbine revolution and superheated steam pressure.
The controller demonstrated capability in managing network frequency and steam pressure amidst load variations and disturbances.
Simulation results showed superior performance compared to existing proportional-integral (PI) controllers.

Conclusions:

The proposed ISMC offers a robust solution for boiler-turbine coordinated control in steam power plants.
This approach improves unit reliability and enhances the plant's participation in network frequency regulation.