access icon openaccess Optimal automatic generation controllers in a multi-area interconnected power system with utility-scale PV plants

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 13/10/2018, Accepted 12/07/2019, Revised 23/05/2019, Published 25/07/2019

The centralised utility-scale photovoltaic (PV) plants installation has greatly enlarged their percentage in the bulk power systems, along with the nature uncertainty for the balance of system power and loads. Consequently, the successful integration of solar PV power in large-scale power systems requires a reliable and efficient multi-area automatic generation control (AGC) system within the control centre. Specifically, area-AGCs that perform tie-line bias control, in which the area frequency regulates the tie-line power flow, must balance the operational control area supply power-and-demand loads within a pre-tuned parameter set. Traditional AGC control systems have area linear controllers that must be periodically tuned to manage the high fluctuation of PV power. A practical two-step tuning method to determine the optimal parameters of existing multi-area AGCs is presented. The proposed method is demonstrated on a five-area multi-machine power system with two large PV plants. The power system was equipped with the synchrophasor-based monitoring system, with a real-time simulation platform serving as the application host. Results indicated that the two-step tuning method provides optimal parameters for all the system AGCs over a wide range of PV penetration levels. Typical results demonstrated the effectiveness of the tuned multi-area AGCs under dynamic conditions and disturbances.

Inspec keywords: power system control; power grids; photovoltaic power systems; power system stability; power engineering computing; frequency control; power system interconnection; power generation control

Other keywords: optimal automatic generation controllers; multiarea automatic generation control system; system power; multiarea interconnected power system; control centre; bulk power systems; large-scale power systems; area-AGCs; five-area multimachine power system; optimal parameters; supply power; -demand loads; PV penetration levels; existing multiarea AGCs; tie-line power flow; tie-line bias control; centralised utility-scale photovoltaic plants installation; two-step tuning method; system AGCs; utility-scale PV plants; area linear controllers; solar PV power; traditional AGC control systems; area frequency; pre-tuned parameter

Subjects: Power engineering computing; Frequency control; Control of electric power systems; Power system management, operation and economics; Optimisation techniques; Solar power stations and photovoltaic power systems; Optimisation techniques; Power system control

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