Vol. 12/ No. 46/Winter 2023 Research Artcle Partcle Swarm Optmizaton Based Sliding Mode Controller for Performance Improvement of Unifed Power Quality Controllers Inverters Mohammad Amin Heidari, Ph.D. Student 1 | Mehdi Nafar, Assistant Professor 2* | Taher Niknam, Professor 3 Abstract In this paper Partcle Swarm Optmasaton (PSO) based Sliding Mode Controller (SMC) introduced to control invrters of Uniefed Power Quality Controllers (UPQC) to control and improve the power quality in microgrids through controlling the output power of the distributed generaton source. In the proposed control scheme, the standard sliding mode controller is used as a robust nonlinear controller, with the additon of the PSO algorithm - to determine the optmal parameters of the SMC controller. Using PSO added extra advantages like reducing chatering problems and increasing accuracy and tracking capability to the commonly knowns SMC benefts. To confrm the accuracy of the proposed controller's performance, computer simulaton is performed under diferent system load conditons in the MATLAB/Simulink sofware environment. The obtained results show the efectveness of the proposed control compared to the standard sliding mode controller in reducing harmonics, reducing voltage imbalance and improving other power quality indicators. Keywords: PSO, UPQC, inverter control, power Quality Highlights • The combinaton of the second generaton and the third generaton of power quality improvement methods. • Providing an economic method to reduce the cost of DG integraton into network. • Improving the sliding mode control method with PSO algorithm. Citation: M. A. Heidari, M. Nafar, and T. Niknam, “Particle Swarm Optimization Based Sliding Mode Controller for Performance Improvement of Unified Power Quality Controllers Inverters,” Journal of Southern Communication Engineering, vol. 12, no. 46, pp. 59–76, 1401, doi: 10.30495/jce.2022.1961181.1162, (in Persian). JOURNAL OF SOUTHERN COMMUNICATION ENGINEERING ISLAMIC AZAD UNIVERSITY BUSHEHR BRANCH 1 Ph.D Student of Electrical Engineering, Department of Electrical Engineering, Marvdasht Branch,Islamic Azad University, Marvdasht, Iran, e_aminheidari@miau.ac.ir 2 Department of Electrical Engineering, Marvdasht Branch,Islamic Azad University, Marvdasht, Iran, mnafar@miau.ac.ir 3 Department of Electrical Engineering, Marvdasht Branch,Islamic Azad University, Marvdasht, Iran, niknam@sutech.ac.ir Correspondence Mehdi Nafar, Assistant Professor of Department of Electrical Engineering, Marvdasht Branch,Islamic Azad University, Marvdasht, Iran, mnafar@miau.ac.ir Received: 16 June 2022 Revised: 3 August 2022 Accepted: 20 September 2022 E-ISSN: 2980-9231 htps://jce.bushehr.iau.ir htps://doi.org/10.30495/jce.2022.1961181.1162