FPGA Implementation of Predictive Hysteresis Current Control for Grid Connected VSI

Cristina Guzman,Kodjo Agbossou,Alben Cardenas

doi:10.4236/epe.2014.62003

Abstract

Grid connected voltage source inverters (VSIs) are essential for the integration of the distributed energy resources. Hysteresis current control (HCC) is a commonly employed method for power control of VSIs. This control method, in contrast with voltage control, provides good dynamics, good stability and implicit over current protection. However, the most important concern of digital implementation of HCC is related with the sampling period of the measured currents. This paper presents a predictive hysteresis current control (HCC) for grid connected voltage source inverter and its FPGA implementation. Simulation and experimental results are provided to verify the validity of the proposed implementation.

Highlights

Modern power systems, looking forward to the Smart Grid concept, involve more and more the integration of the Distributed Energy Resources (DER) mainly based on clean energy sources like wind power (WP) and photovoltaic (PV)
Several simulations have been carried out using different filter inductances, and the total harmonic distortion (THD) of the Voltage source inverters (VSIs) current has been computed for each case
3.8 grid connected VSI with the same characteristics used in simulation

Summary

Introduction

Modern power systems, looking forward to the Smart Grid concept, involve more and more the integration of the Distributed Energy Resources (DER) mainly based on clean energy sources like wind power (WP) and photovoltaic (PV). Most of the modified strategies of HCC offer better performances than the classic one when they are implemented using analog logic circuitry When their implementation is made in digital processors like the field programmable gate arrays (FPGAs), without external analog logic, the mean switching frequency is limited by the sampling rate of the analog-to-digital converters (ADCs). Simulation and experimental results are presented showing a good accuracy of the all digital implementation of HCC proposed This predictive HCC has been validated by using a Xilinx FPGA as the digital target and a single phase grid connected VSI as the power electronics application

Hysteresis Current Control

Proposed Hysteresis Current Control

Hardware in the Loop Co-Simulation

Experimental Results

Conclusions