Abstract
The load frequency control (LFC) problem for Isolated Power System is considered from the viewpoint of optimal control theory. However, the practical implementation of the optimal controller requires the measurement of all the state variables. This is a serious limitation because of the difficulties involved in their measurement. Output feedback will allow us to design plant controllers of any desired structure. This is another reason for preferring it over full-state feedback. In the regulator problem, we are interested in obtaining good time responses as well as in the stability of the closed-loop system. Therefore, we shall select a performance criterion in the time domain. The simulation results indicate that the proposed control scheme works well. In addition, they show that the controlled system is robust to bounded input disturbances acting on the system.
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Abbreviations
- \( u(t) \) :
-
: control input
- \( \Delta f \) :
-
: incremental frequency deviation in Hz
- \( \Delta P_{g} \) :
-
: incremental change in generator output power in pu.Mw
- \( \Delta X_{g} \) :
-
: incremental change in governor valve position in pu.Mw
- \( \Delta \delta \) :
-
: incremental change in voltage angle in rad
- \( \Delta P_{d} \) :
-
: load disturbance in pu.Mw
- \( T_{g} \) :
-
: governor time constant in seconds
- \( T_{t} \) :
-
: turbine time constant in seconds
- \( T_{P} \) :
-
: plant time constant in seconds
- \( K_{P} \) :
-
: plant gain
- \( R \) :
-
: speed regulation due to governor action in Hzp.u.MW−1
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Huynh, V.V., Minh, B.L.N., Nguyen, T.M. (2018). Optimal Load Frequency Control in an Isolated Power System. In: Duy, V., Dao, T., Zelinka, I., Kim, S., Phuong, T. (eds) AETA 2017 - Recent Advances in Electrical Engineering and Related Sciences: Theory and Application. AETA 2017. Lecture Notes in Electrical Engineering, vol 465. Springer, Cham. https://doi.org/10.1007/978-3-319-69814-4_91
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DOI: https://doi.org/10.1007/978-3-319-69814-4_91
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