Dc/ac converters connected to unbalanced distribution systems: analysis considering Negative- and Zero-Sequence voltage components

• Grant number: 14/14361-8
• Support Opportunities: Regular Research Grants
• Start date: October 01, 2014
• End date: September 30, 2016
• Field of knowledge: Engineering - Electrical Engineering - Industrial Electronics, Electronic Systems and Controls
• Principal Investigator: Claudionor Francisco Do Nascimento
• Grantee: Claudionor Francisco Do Nascimento
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated researchers: Alvaro Batista Dietrich ; Paulo José Amaral Serni

Abstract

In near future distribution grids will comprise alternative sources, such as wind, photovoltaic and fuel cells and by many nonlinear loads, both unbalanced three-phase and single-phase. These alternative sources must be connected to the power system through a DC/AC voltage source converter (VSC) and many of these sources will be single-phase. Thus, it is expected a significant increase in the unbalanced voltage and harmonic distortion in such grid, which imposes serious restrictions to control the alternative sources converters connected to the grid, due to the double frequency ripple on the DC side of these converters. The researchers studied this problem caused by the negative-sequence component. In the present proposal will be considered in the converter modeling unbalanced voltages which generates the negative- and zero-sequence components.In the described context arises the main objective of this proposal: the study and the development of analytical models of the phenomena caused by unbalanced voltage and also by harmonic distortion in a three-phase VSC converter connected to a grid. This study considers the ripple voltage on its DC side and the generation of harmonic on its AC side due to the ripple on the DC side. This study will produce subsides for the development of techniques for the design and control of converters, allowing mitigation of DC side oscillating voltage (ripple) and harmonic distortion caused by the unbalanced voltage. With this, we expect to contribute with methods to ensure the grid power quality even when energy is injected by these converters. (AU)

Scientific publications

(7)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DIENE, OUMAR; MOREIRA, MARCOS V.; SILVA, EDUARDO A.; ALVAREZ, VICTOR R.; NASCIMENTO, CLAUDIONOR F.. Diagnosability of Hybrid Systems. IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, v. 27, n. 1, p. 386-393, JAN 2019. (14/14361-8)

NASCIMENTO, CLAUDIONOR F.; DIENE, OUMAR; WATANABE, EDSON H.; IEEE. Analytical Model of Three-Phase Four-Wire VSC Operating as Grid-Forming Power Converter under Unbalanced Load Conditions. 2017 IEEE 12TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS), v. N/A, p. 6-pg., 2017-01-01. (14/14361-8)

DIENE, OUMAR; NASCIMENTO, CLAUDIONOR F.; WATANABE, EDSON H.; IEEE. Stability Analysis of Grid-Connected Voltage-Source Converters with Unbalanced Loads. 2017 IEEE 12TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS), v. N/A, p. 6-pg., 2017-01-01. (14/14361-8)

NASCIMENTO, CLAUDIONOR F.; WATANABE, EDSON H.; DIENE, OUMAR; DIETRICH, ALVARO B.; GOEDTEL, ALESSANDRO; GYSELINCK, JOHAN J. C.; DIAS, ROBSON F. S.. Analysis of Noncharacteristic Harmonics Generated by Voltage-Source Converters Operating Under Unbalanced Voltage. IEEE Transactions on Power Delivery, v. 32, n. 2, p. 951-961, APR 2017. (14/14361-8)

BELATI, EDMARCIO A.; NASCIMENTO, CLAUDIONOR F.; DE FARIA, JR., HAROLDO; WATANABE, EDSON H.; PADILHA-FELTRIN, ANTONIO. Allocation of Static Var Compensator in Electric Power Systems Considering Different Load Levels. JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS, v. 30, n. 1, p. 1-8, FEB 2019. (14/14361-8)

PEREIRA, J. S.; BELATI, E. A.; NASCIMENTO, C. F.; SILVA, P. F.; ROSSONI, P.. A Mathematical Programming Approach for Allocation and Analysis of TCSC in Power Transmission Systems. IEEE Latin America Transactions, v. 20, n. 7, p. 9-pg., 2021-07-01. (14/14361-8, 18/03015-2, 16/08645-9)

DIENE, OUMAR; ROCHA, FELIPE P.; NASCIMENTO, CLAUDIONOR F.; WATANABE, EDSON H.; IEEE. Model Predictive Control of Grid-Connected Voltage-Source Converters Operating as STATCOM with Unbalanced Loads. 2019 IEEE 13TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS), v. N/A, p. 6-pg., 2019-01-01. (14/14361-8)