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This paper proposes a decentralised secondary voltage control strategy thathas several benefits over the existing centralised strategies. For that, a newstructure for the control is proposed in terms of an inner and outer loops foreach generator. The individual generators of a particular zone participate inthe secondary voltage control by aligning their reactive powers with respect tothe pilot point voltage reference. The decentralised nature of the proposedcontrol strategy enables plug and play operation: run with different numbers ofgenerators without any need of regulators reconfiguration, resilience in caseof generator failure. This allows one to use such control to integraterenewable generators to existing secondary regulations alongside with theclassic generators. The proposed control strategy is implemented using amodel-free control scheme that does not require a higher order complex model ofthe power grid. The deployment of a discrete-time intelligent proportionalcontroller simplifies the tuning of the controller gains. The proposed strategyis validated on a four generator power system model in MATLAB/Simulink/Simelectrical environment. Simulation results are presented to showthe effectiveness of the proposed strategy along with different case studiessuch as load perturbation, transmission line perturbation, generatordisconnection and delay in pilot point voltage measurement to highlight itsrobustness.

A Decentralised Control Strategy for Secondary Voltage Regulation