Chapter 10 Evaluation of the Distortion and Unbalance Emission Levels in Electric Networks

1. Introduction

2. Assessment of harmonic distortion and unbalance in power systems

2.1. Preliminary definitions

2.2. Power quality indexes

3. Localization of sources producing distortion

3.1. Analisys of active harmonic powers

3.1.1. An index to identify distorted loads based in harmonic powers

3.2. Conforming and non-conforming currents

3.3. Linear and nonlinear current

3.4. Practical cases: Digital simulations

3.4.1. Case 1: Sinusoidal voltage

3.4.2. Case 2: Non-sinusoidal voltage

4. On the measurement of PQ indices in the presence of capacitor bank

4.1. Case 1: Inductive and capacitive linear loads

4.2. Case 2: Non linear load and capacitive load

5. Assessment of unbalance emission

5.1. Conforming and nonconforming unbalance current

5.2. Balanced linear currents and unbalanced non-linear currents

5.3. Practical case: Digital simulation

6. Practical cases: Experimental results

6.1. Case A: Non linear and balanced load

6.2. Case B: Non lineal and unbalanced load

7. Discussion of the results and conclusions

Summary of indices

Acknowledgments

Author details

References