CPT-Based Multi-Objective Strategy for Power Quality Enhancement in Three-Phase Three-Wire Systems Under Distorted and Unbalanced Voltage Conditions

Author(s)

Paredes, Helmo K. Morales ^[1] ; Rodrigues, Diego T. ^[1] ; Cebrian, Juan C. ^[1] ; Bonaldo, Jakson P. ^[2]

Affiliation

^[1] Sao Paulo State Univ UNESP, Inst Sci & Technol Sorocaba, BR-18087180 Sorocaba - Brazil

^[2] Fed Univ Mato Grosso UFMT, Dept Elect Engn, BR-78060900 Cuiaba - Brazil

• Document type: Journal article
• Source: IEEE ACCESS; v. 9, p. 53078-53095, 2021.
• Web of Science Citations: 0

Abstract

This paper explores the application of multifunctional inverters connected to the electrical network, to propose an adaptable system to individually control reactive power, load imbalance, and harmonic currents. Based on Conservative Power Theory (CPT), the dynamic compensation of Power Quality (PQ) indices is carried out under different conditions of demand and energy generation. First, a set of global factors for reactive power, imbalances, and current harmonics is introduced, which are effective even for bidirectional power flows in systems with harmonic voltage distortion and/or voltage unbalance. This set of factors gives rise to a multiobjective decision-making algorithm to estimate coefficients of proportionality, which instantly considers the reference signals linked to the disturbances, enabling to individually keep track of the target values of each of the PQ indices, as customarily established through standards or electricity utility criteria. As a result, this proposed approach allows a multiobjective operation of the inverter connected to the network, thereby allowing maximum use of energy generated, as well as limiting energy losses of distribution networks, and enhancement of the PQ of a prosumer. Finally, to illustrate the effectiveness of the proposed approach, different case studies were simulated with this set of case studies, including one representative real case containing a PV system connected to the network and a non-linear unbalanced load with variable demand. (AU)

• FAPESP's process: 18/20708-1 - Planning of Modern Production Systems in the Context of Industry 4.0 and Smart Grid
• Grantee: Juan Carlos Cebrian Amasifen
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/22629-9 - Development of compensation techniques and methodologies for power quality analysis of modern distribution systems
• Grantee: Helmo Kelis Morales Paredes
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 16/08645-9 - Interdisciplinary research activities in electric smart grids
• Grantee: João Bosco Ribeiro do Val
• Support Opportunities: Research Projects - Thematic Grants