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Cycle 7 (2018 Deadline)

Impact of rooftop PV system integration on Tunisian electrical distribution network

PI: Ilhem Slama-Belkhodja (, Ecole Nationale d'Ingénieurs de Tunis ( ENIT)
U.S. Partner: Jonghyun Park, Missouri University of Science and Technology
Dates: November 2018 - October 2020

Project Overview:

This project aims to study rooftop photovoltaic (PV) system integration effects on Tunisian electrical distribution network (EDN). The solar photovoltaic energy has been promoted for residential (policies subsidies for encouragement, special pricing, etc.) for several years in Tunisia, where electrical energy consumption in residential sector is important: more than 30% of the total electrical energy consumption. In particular, the project will use the Power Hardware-in-the-Loop (PHIL) approach to investigate some solutions considered as promising to cope with voltage and frequency variations due to PV system integrations in the EDN, considering Tunisian conditions. Special solutions will be distributed to storage systems, as several private Tunisian companies are interested in self consumption with local storage and micro grids as concepts. This project will generate a dataset in the field of PV residential load profiles, which will serve as the basis for establishing Tunisian computer models. These models will run in real-time while using a hardware test setup to validate a holistic PV-battery energy storage inverter. The control will be applied across a Tunisian EDN under different loading scenarios and with varying penetrations of PV-only and PV-energy storage units combined. The expected PHIL-based testbed will allow researchers and manufacturers to safely evaluate energy technologies performance and reliability, autonomous devices and their control parameters and their interaction with Tunisian EDN.

The global aim of the proposed project is to assist national policy makers and the main institutions responsible for the development of renewable energies in Tunisia to evaluate Tunisian PV rooftop capacity. The project will take into account the current grid infrastructure, protection plan, and peak demand. The resulting analysis could be used to adopt more appropriate strategies to secure sustainable distribution in the future. As the PHIL-based target platform will be flexible and scalable, it can contribute to high-impact studies beyond the activities included in the project. For example, it can provide private investors or manufacturers of energy technologies with an experimental platform for first evaluation of their new products. The project will engage, motivate, and train Tunisian students preparing them for the workforce in the interdisciplinary area of energy, power, and control through the development of various science activities. This research will contribute to the development objective “Inclusive Private Sector Employment Increased,” which is one of the objectives identified in the Government of Tunisia’s proposed 2016-2020 Strategic Development Plan.

Summary of Recent Activities

In this project period, models for healthy conditions and for implementation in a PV module emulators were studied by the Phd student Manelle HASNAOUI. This work is continuing by development of a performance standards tests procedure and experimental test based on NI-Labview environment . It is supervised by Mrs. Houda BENN ATTIA SETHOM. Phd Manelle HASNAOUI will also write a report related to PV model. This report has to be improved before any diffusion. Models under shadow conditions has been developed by Engineering student under the supervision of Mme Afef BENNANI BEN ABDELGHANI. This work will be submitted for publication in a conference in 2020. The proposed paper deals with the development of PV array model under partial shading conditions.

First, the PV module or PV array will be represented by the five-parameter equivalent circuit. Then, an easy and simple method is proposed to obtain the parameters of the array model using information from the datasheet. The developed model of the PV array (formed by several modules connected in series and/or parallel) is implemented in Matlab and PSIM. Simulation and experimental results will be provided to prove the proper modeling of the PV module and/or array.

“Energy storage technologies” Professor Amine LAHAYANI gave a lecture on" Electrical Energy Storage" and helped the team involved in the project to have an idea about the market related to second use batteries and others. Mme Sondes SLANDER-MUSTAPHA established batteries models in PSIM environment to be associated with PV modules and an Energy management systems. In the new version of PSIM just purchased, these models are available. Validation of these models in healthy but also any other abnormal situation will be investigated.

The generation of Home Appliances Data Base Signatures has been investigated and performed within the framework of an engineer-student final internship in collaboration with the National Engineers School of Carthage supervised by Mme Houda BEN ATTIA-SETHOM. A platform has been developed under the environment LabVIEW to:
-Acquire voltage and current waveforms of various Home Electric Appliances (HEAs),
-Compute power and frequency signatures of each HEA,
-Store the HEAs related data and signatures in a Data Base designed and generated for this purpose.

Synchronization and DC-AC Converter control interfacing the grid have been investigated as well as monitoring the electrical distribution network using residuals based on grid voltage measurement. The team involved in this work was Jihen ARBI-ZIAINI, Manel JEBALI BEN GHORBAL and Ilhem SLAMA-BELKHODJA. A first energy management system for PV system working in parallel with local electrical storage system and local loads has been developed by Sondes SKANDER-MUSTAPHA why stability of such system is under consideration by Manef BOUROGAOUI.

In the next 3-6 months, the PI and her team will carry out the following activities:

1) Meeting with STEG and ANME
2) Conduct a visit to Solar Batteries company and negociation of MOU
3) training or outreach events: 1rst week of september for 1er engineering school Student : introduction for Engineering studies and Electrical circuits lesson by means of Experimentation based on PV systems ( 15 hours with All these students , about 50). For the next edition, we will have a new experience with INES Solar participation ( From France)
4) One day outreach events when their new equipment will be received
5) Training days on their new equipment
6) Internal seminary on Data fro our systems ( collection, treatment ,etc)

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