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Power Quality

Code:

MEC121003

Sigla:

QEE

Áreas Científicas
Classificação	Área Científica
OFICIAL	Electric Power Systems

Ocorrência: 2022/2023 - 2S

Ativa?	Yes
Unidade Responsável:	Departamento de Engenharia Eletrotécnica
Curso/CE Responsável:

Ciclos de Estudo/Cursos

Sigla	Nº de Estudantes	Plano de Estudos	Anos Curriculares	Créditos UCN	Créditos ECTS	Horas de Contacto	Horas Totais
MEEC	5	Plano de Estudos_2020	1	-	7,5	75	202,5

Língua de trabalho

Portuguese

Objetivos

Study of problems related to power quality. Analysis of the impact on the electrical systems originated by poor power quality. Study of various solutions to mitigate the problems related to power quality.

Resultados de aprendizagem e competências

At the end of the Curricular Unit the student should be able to:
1. Have an overview of the importance of this subject within a professional context.
2. Identify the disturbances that could give rise to a power quality problem and be aware of their various characteristics.
3. Identify the loads that could cause power quality problems
4. Know what are the solutions for eliminating/mitigating power quality problems
5. Be aware of the main standards associated with the quality of electrical energy

Modo de trabalho

Presencial

Programa

General aspects related to power quality:
Definition of the problem of power quality
-Types of variations and disturbances
Harmonic distortion:
-Harmonic generators on the electric power grid
-Harmonics in power grid
-Standards for the limitation of harmonics
-Techniques for reducing harmonics
Power factor vs harmonic distortion
General aspects related to the measurement of harmonics:
-Classical Instruments
-True RMS Instruments
Impact of the association of rectifiers in the current harmonic distortion:
-Serial association
-Parallel association
Filters for the correction of the power factor:
-Passive Filters
-Active Filters
High power factor rectifiers:
-Condution modes
-Topologies
Harmonic attenuation on the capacitors:
-Serial and parallel resonancel
-Passive and active solutions
Uninterruptible Power Supplies (UPS):
-Rotary UPS
-Static UPS
-Principal parameters
Impact of the ground on Power Quality
- Grounds with or without return wire
- Security aspects
Measurement and Analysis of Power Quality
- Power quality measurements
- Types of equipment for monitoring power quality
- Analysis of power quality measurement data

Bibliografia Obrigatória

Victor Pires; Documentação de apoio à Unidade Curricular (disponível no moodle)

Bibliografia Complementar

Math H. J. Bollen ; Understanding power quality problems
R.C. Dugan R.C, M.F. McGranaghan ; Electrical Power System Quality
C. Sankaran ; Power Quality
Surya Santoso; Fundamentals Of Electric Power Quality

Métodos de ensino e atividades de aprendizagem

a) Lectures: Interactive exhibition and demonstration method;
b) Practical Classes: Solving problems with relevant interest
c) Laboratory Classes: experimental method applied to the development of circuits and systems based on the knowledge acquired in the theoretical and practical lessons.

Tipo de avaliação

Distributed evaluation without final exam

Componentes de Avaliação

Designation	Peso (%)
Apresentação/discussão de um trabalho científico	30,00
Teste	30,00
Trabalho laboratorial	40,00
Total:	100,00

Componentes de Ocupação

Designation	Tempo (Horas)
Apresentação/discussão de um trabalho científico	30,00
Estudo autónomo	57,00
Frequência das aulas	45,00
Trabalho laboratorial	30,00
Total:	162,00

Obtenção de frequência

Realization of laboratory work (L)

The lab grade is assigned based on the analysis and discussion of the reports and in the performance demonstrated by each student in the laboratory classroom.

Realization of a theoretical work with presentation in class (P)

Assessment by exam (T).

 

Conditions of approval:

Final Rating = 0.35 * T + 0,35 * P + 0.35 * L

 

Final Rating ≥ 10

Fórmula de cálculo da classificação final

Conditions of approval:

Final Rating = 0.35 * T + 0,35 * P + 0.35 * L

 

Final Rating ≥ 10