Application of WOA Tuned Type-2 FLC for LFC of Two Area Power System With RFB and Solar Park Considering TCPS in Interline

Abstract

In this article, interval type-2 fuzzy logic controller (IT2FLC) has been proposed as secondary load frequency controller (LFC) for hybrid two area power system instead of type-1 fuzzy logic controller (T1FLC) and PID based controllers. The investigated power system integrates both conventional and renewable power resources like large scale solar parks. These large scale solar parks in addition to demand load changes increases load frequency control problems due to their continuous and severe output power variation. In order to reduce the effect of solar irradiance variation on the power system, another type-2 fuzzy logic controller has been proposed to control the output for the solar park during cloudy days instead of maximum power point trackers. As one of the best energy storage systems utilized in modern power systems, Reduction oxidation flow battery (RFB) has been integrated in the investigated power system to act as fast active power source which absorbs and discharges power during disturbances caused by generation or demand changes. Power flow controller like thyristor controlled phase shifter (TCPS) has been proposed in this paper to control tie-line power shared between generating areas during system disturbances. In order to enhance the dynamic performance for the proposed controller, meta-heuristic nature inspired optimization algorithm like whale optimization algorithm (WOA) has been proposed for proposed controller gains off line tuning. The superiority of the proposed IT2FLC controller against T1FLC controller has been investigated by simulating their performance during severe demand load changes and solar irradiance variations, while WOA enhanced the dynamic performance of the proposed controller compared to other optimization algorithms like particle swarm optimization (PSO) and grey wolf optimization (GWO).INDEX TERMS Area control error (ACE), automatic generation control (AGC), flexible alternating current transmission system (FACTS), interval type-2 fuzzy logic system (IT2FLC), load frequency control (LFC), redox flow battery (RFB), solar park, thyristor controlled phase shifter (TCPS), whale optimization algorithm (WOA).

PSO tuned interval type-2 fuzzy logic for load frequency control of two-area multi-source interconnected power system

“…In 14 , T1FLC has been proposed to act as LFC for two-area power system with interline power flow controller (IPFC) while the gains for the proposed controller have been controlled by PI controller, the proposed controller as well as IPFC have contributed to enhance the power system stability and reducing the system oscillation. Whale optimization algorithm (WOA) tuned IT2FLC has been proposed in 15 for two-area power system with thyristor controlled phase shifter (TCPS) in tie line as power flow controller, the proposed controller has enhanced the dynamic performance for the power system compared to T1FLC because IT2FLC has handled the uncertainty in the feedback signal. In 16 , artificial bee colony algorithm tuned T1FLC has been proposed in order to control the reserve active power from wind turbine during demand load changes in micro grid power system where the reserve active power is the difference between the wind turbine maximum output power and the de-loaded turbine power while the proposed controller has enhanced the dynamic performance for the turbine rotor speed, pitch angle behavior and the overall micro grid system frequency.…”

“…IT2FLC is one of artificial intelligent techniques which can be utilized as power systems LFC. There are many reasons which make IT2FLC superior to classical controllers such as: It is robust controller where precision of inputs are not necessary 15 . In general, fuzzy logic systems are able to solve complex problems because they resemble human thinking 13 .…”

“…As one of the best optimization techniques which has been used with LFC problems 11 , 13 , 15 , PSO has been proposed in this work to optimize IT2FLC gains in order to enhance the performance of the proposed controller. PSO is a meta heuristic technique inspired by the movement of swarms like birds or schooling fish while searching for food 21 .…”

“…The investigated two-area multi-source power system has been introduced in 11 , 13 , 15 . The power system has two generating areas, each area of generation has several generating units.…”

“…In contrast, maximizing the output power from the solar park during disturbances or cloudy periods may affect the power system stability. Consequently in 13 and 15 , solar park controllers based on T1FLC and IT2FLC respectively has been proposed to control the solar park output power during disturbance periods caused either by severe demand load changes or solar irradiance changes. The proposed solar park controller in 15 based on IT2FLC has been utilized in this work to control solar park power plants which integrated in area-1 and area-2.…”