It is already established that the renewable integration effects to the power system are nonzero and become more important with large penetrations. Thereby, the impacts of renewable energy sources (RESs) after integration are studied in this work to stabilize grid frequency of the studied test power system model. Initially, the two-area power system model is studied as the test system. The purpose is to show the tuning efficiency of non-conventional quasi-oppositional dragonfly algorithm (QODA) algorithm as compared to conventional way of tuning technique. It is showed that QODA algorithm is quite effective to find the optimal parameters of proportional–integral–derivative (PID) controller in load frequency control performance. Further, the three-area power system model integrated with RESs is studied. The work done here is to study the impacts of wind turbine generation, solar thermal power generation and solar photovoltaic on system frequency oscillations. The PID controller is employed as the supplementary control task, and its parameters are tuned by QODA algorithm. The integral of time absolute error is chosen as the objective function, and further performance indices are determined at the end of the execution of the program to examine the performance of the designed QODA-based PID controller. Following the integration of RESs, the impacts on frequency deviation through simulation results are also presented. The simulation results showed that the RESs are quite effective in regulating the power system frequency deviation understudied.

This paper proposes a shunt active filter (SAF) for harmonic mitigation and reactive power compensation in an induction heating (IH) system. The high-frequency switching in the resonant inverter of the IH system generates a considerable number of high-frequency harmonics. The latter flow back to the supply side and causes a wide variety of problems. The predominant ones are the deterioration of the power quality, distortion in the grid voltage, and malfunctioning of the protective equipment. These harmonics need to be attenuated as per the IEEE 519-1992 and IEEE 519-2014 standards. To overcome these problems, an SAF based on the modified version of instantaneous power theory was placed between the power supply and the IH equipment. Moreover, the proposed model could work in unbalanced and non-sinusoidal input voltage conditions, as well as dynamic conditions with changing reference currents. The feasibility of the proposed SAF-based IH system was verified by a series of simulation results and a comparative analysis of the THD of the input currents. The power quality issues were successfully addressed, which signifies the ability and effectiveness of the proposed model to mitigate the problems caused by harmonics and enhance the power factors.

This paper starts with the benchmark analysis of shunt active power filter (SAPF) for adjustingeither compensations of harmonic current or compensating reactive power. Such equipment can capable of minimizing the content of harmonics present in the grid side generated by the non-linear loads. The proposed work represents the proficient responseof shunt active power filter for annihilates the contents of harmonics to keep the better quality of power supply.The implementation of SAPF on three-phase bridge (TPB) converters associated with cascaded single-stage transformers has been introduced.The transformers arrangements allow the compensator to utilize one dc-link unit that simplifies the management strategy and themode of operation. The system waveforms are provided by employing an appropriate pulse width modulation (PWM) technique having good co-relation with transformer turn ratio. System overview and easy maintenance create the projected SAPF has an efficient solution related with some standard previous configured model. The proposed model, PWM method and the control managements are given also as studies considering non-linear distortion and switching losses estimation. A MATLAB Simulink has been used to validate theImplementation of SAPF based on Cascaded Transformers Coupled with Three-Phase Bridge Converters.