This study highlights an attempt of comparing the performance of several energy storage (ES) devices like battery ES, flywheel ES, capacitive ES, superconducting magnetic ES, ultra-capacitors and redox flow battery (RFB) in automatic generation control under bilateral deregulated scenario. The considered system comprises gas and thermal generations wherein a geothermal power plant (GTPP) is also incorporated. Gas and thermal systems are provided with appropriate generation rate constraints. A new fractional order (FO) cascade controller named as FO proportional-integral-FO proportionalderivative (FOPI-FOPD) is proposed as secondary controller and its performance is compared with commonly used classical controllers. A novel stochastic algorithm, sine cosine algorithm, has been used to optimise controller gains and other parameters. Analyses of dynamic responses reveal the superiority of FOPI-FOPD over others in terms of settling time, peak deviation and magnitude of oscillation. The effect due to GTPP introduction has been examined and the responses disclose that the integration of GTPP leads to better dynamics. Performances of various ES devices in the presence of FOPI-FOPD controller are also compared and dynamic responses of RFB found superior to others. For a more realistic scenario, analysis is done considering time delay and some practical plants of Nevada, USA.

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The present study highlights an attempt of integrating the geothermal power plant (GTPP) in automatic generation control of an interconnected system comprising of dish-Stirling solar-thermal system (DSTS) and the conventional thermal system (TS). Generation rate constraints of 3%/min are considered for the TSs. A new fractional-order (FO) cascade controller named as FO proportional (P)-integral (I)-FOP-derivative (D) (FOPI-FOPD) is proposed as secondary controller and performance is compared with commonly used classical controllers. Controller gains and other parameters are optimised using a novel stochastic algorithm called sine-cosine algorithm. The analysis reveals the superiority of FOPI-FOPD over others. The effect of inclusion of GTPP and DSTS is also analysed on the conventional TS, both in a combined manner and separately. Sensitivity analysis reflects the robustness of optimum FOPI-FOPD controller gains and other parameters obtained at nominal and recommend that the optimised parameters do not suffer much deviations and are able to withstand wide fluctuations in system operating conditions, system loading and inertia constant. The dynamic behaviour of the system is studied with 1% step load perturbation in area1.

This paper highlights an attempt of comparing the performance of several energy storage (ES) devices such as battery ES, flywheel ES, capacitive ES, superconducting magnetic ES, ultra-capacitors, and redox flow batteries (RFBs) in automatic generation control of an interconnected system. The considered system comprises conventional thermal, hydro, wind, and solar photovoltaic generations wherein a geothermal power plant (GTPP) is also incorporated. The thermal and hydro systems are provided with appropriate generation rate constraints. A new fractional order (FO) cascade controller named as the FO proportional-integral–FO proportional-integral-derivative (FOPI-FOPID) is proposed as a secondary controller, and its performance is compared with the commonly used classical controllers. A powerful stochastic algorithm called the Sine Cosine Algorithm has been used to optimize the controller gains and other parameters. Analyses of the dynamic responses reveal the superiority of FOPI-FOPID over the others in terms of settling time, peak deviation, and magnitude of oscillation. The effect due to introduction of GTPP has been examined, and the responses disclose that integration of GTPP leads to better dynamics. The comparison of performances of various ES devices in the presence of the FOPI-FOPID controller highlights the predominance of RFB over others.

This study highlights the operation under the bilateral scenario of the deregulated environment, considering a three unequal area thermal system, wherein several renewable sources namely geothermal plant (GTP), solar thermal and wind had been integrated to analyse their effect both through dynamic responses as well as analytically from the aspect of GENCO participation, related to the price based environment. Later a flexible alternating current transmission (FACT) device, interline power flow controller (IPFC) is being connected to the above-considered system at different positions. Various observations are made for checking if there is an optimal location for the placement of IPFC and it reflects that IPFC placed between the tie lines of area 1 and area 3 shall economically be the most feasible option. The considered thermal systems are provided with suitable generation rate constraints. In this study, an initiative has been taken to use a new combination of fractional order (FO) cascade controller, FO integral-FO proportional-derivative as secondary controller and its capability is being checked with the traditional controllers revealing it to outperform the others. The gains and other required parameters of all the secondary controllers are optimised by means of the stochastic sine cosine algorithm.