Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
Comparison of Current Grid Controllers in a DGInverter with Grid Harmonic Distortion
William Caires Silva Amorim (CEFET-MG)Dayane do Carmo Mendonça (UFV)João Marcus Soares Callegari (UFV)
Matheus Pereira Silva (UFV)Heverton Augusto Pereira (UFV)
Allan Fagner Cupertino (CEFET-MG)
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
INTRODUCTION
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Distributed Power Generation
Nonlinear Loads: Distortion in the Grid
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
How to minimize the impact of the presence of nonlinear loads in the grid?
PI Controller PR Controller RT Controller
Filters
Controllers
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY - Single-phase DG Inverter System
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY – Control Strategy
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
GRID VOLTAGE PROFILE
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY - Implemented Loop Control
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY - Discretization Methods
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Forward
Backward
Trapezoidal
PI Controller
PR Controller
RT Controller
Tustin pré-warping
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY - PWM Sinusoidal Modulation
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Unipolar PWM Bipolar PWM
Hybrid PWM
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
METHODOLOGY – Case Study
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
SYSTEM PARAMETERS CONTROLLERS PARAMETERS
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
RESULTS – Techniques Modulations: TDD Analysis
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Unipolar
Bipolar
Hybrid
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
RESULTS – Power Losses
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Power Losses w/ Grid Harmonic Distortion Power Losses w/o Grid Harmonic Distortion
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
RESULTS – Controllers Response
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
RESULTS – Short Circuit Level
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
PI Controller
PR Controller
RT Controller
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
RESULTS – Variation of the TDD (%) with the short circuit level (ϒ)
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Grid Impedance
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
CONCLUSION
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
The PR and RT controllers presents the lower power losses in Hybrid modulation;
TDD rate revealed the Hybrid modulation is a poor in grid current quality;
The short circuit analyzes presented a lower TDD varying the short circuit factor, in PR and RT controller;
The study revealed an excellent response of the PR and RT controllers in the grid energy quality, for unipolar modulation and hybrid modulation for PI controller;
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
ACKNOWLEDGMENT
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil
Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion
Thank you!
Questions?!
William Caires Silva Amorim
Mestrando em Engenharia Elétrica | PPGEL/CEFET-MG
Engenheiro Eletricista | UFV
Gerência de Especialistas em Sistemas Elétricos de Potência | GESEP
E-mail: [email protected]