Metodologias para a avaliação do impacto harmônico coletivo de cargas residenciais em modernos sistemas de distribuição de energia elétrica

Author(s)

Diogo Salles Corrêa

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
• Defense date: 2012-04-06

Examining board members

Walmir de Freitas Filho; Denis Vinicius Coury; Nelson Kagan; José Antenor Pomilio; Luiz Carlos Pereira da Silva

• Advisor: Walmir de Freitas Filho

Abstract

The proliferation of electronic-based residential loads has resulted in significant harmonic distortion in the voltages and currents of distribution power systems. There is an urgent need for techniques that can determine the collective harmonic impact of these modern residential loads. Such techniques can be used, for example, to predict the harmonic effects of widespread adoption of compact fluorescent lights (CFLs). In response to this need, this PhD thesis proposes a versatile Monte Carlo simulation method for evaluating the potential impact of such residential loads on the harmonic levels of power distribution systems. The method models the random harmonic current injections of residential loads by simulating their operating states. This is done by determining the switch-on probability of a residential load based on load research results. The result is a time-varying harmonic equivalent circuit representing a residential house. By combining multiple residential houses supplied from a service transformer, a probabilistic model for service transformers is also derived. Field measurement results confirmed the validity of the proposed technique. The proposed methodology is applied to a typical distribution system for evaluating the impact of residential loads on several power quality aspects. The results of different case studies proved to be valuable in answering the following questions: (1) What are the potential power quality impacts of distributed nonlinear residential loads on primary and secondary power distribution systems? The example impacts include voltage distortion, zero sequence harmonics, neutral voltage/current rise, telephone interference, metering error, increased losses, overloading of distribution transformers. (2) How serious the impacts will become when more and more energy efficient appliances and consumer electronics penetrates into the residential loads? (3) If the consequence is of concern, what are the strategies and options available for utilities to manage the problem? (AU)

• FAPESP's process: 08/07000-8 - Methodologies for evaluating the collective impact of residential loads in modern power distribution systems
• Grantee: Diogo Salles Correa
• Support Opportunities: Scholarships in Brazil - Doctorate