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A flexible AGC algorithm for the Hellenic interconnected system

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6 Author(s)
Vournas, C.D. ; Dept. of Electr. Eng., Nat. Tech. Univ., Athens, Greece ; Dialynas, E.N. ; Hatziargyriou, N. ; Machias, A.V.
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A flexible automatic generation control (AGC) algorithm is described that has been developed for the Hellenic interconnected system. The algorithm includes the three well-known load frequency control (LFC) types (flat frequency, flat tie-line, and tie-line bias) and introduces four operating modes that depend on the magnitude of the measured area control error (ACE). These modes are the steady-state operating mode, the normal operating mode, and two distinct emergency modes. The LFC stability margins are calculated for the case of slow-acting, flat frequency control. The effects of integral feedback are also considered and analyzed. An approximate economic dispatch algorithm is presented that makes use of a predetermined table of the economic loading of units. Simulation results are reported that demonstrate satisfactory operation of the AGC system. Detailed transient stability program simulations demonstrate that a number of ACE measurements per measuring period are necessary to avoid dangerous false emergencies

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Power Systems, IEEE Transactions on  (Volume:4 ,  Issue: 1 )