Power management strategies and energy storage needs to increase the operability of photovoltaic plants

This paper analyzes the effect of introducing an energy storage (ES) system in an intermittent renewable energy power plant such as a photovoltaic (PV) installation. The aim of this integration is to achieve an improvement in the operability of these power plants by increasing their production predictability. This will allow a further PV integration within the electrical power system, facilitating the system’s load–demand balance. In this manner, the paper proposes two power management strategies (PMSs), each with different configurations, for operating a PV power plant: the first focuses on fixing constant power production and the latter focuses on reducing the high frequency fluctuations of the production. Thereafter, this paper analyzes and quantifies the ratings of the ES system (ESS) required to ensure a reliable performance of the plant on an annual basis for each of the PMSs with their different possible configurations. The resulting ES ratings vary with these PMS configurations. It can be concluded that significant improvements in production predictability are achieved with an ESS energy capacity of approximately 50% of the average daily energy produced by the PV panels and a power rating of around 55% of the plant’s rated power. All the results are based on 1-year-long simulations which used real irradiance data sampled every 2min

Sur les systèmes de l'électronique de puissance dédiés à la distribution électrique – Application à la qualité de l'énergie.

The present PhD thesis deals with distribution grid-connected power electronic devices. The main focus has been power quality improvement with power electronic devices. The theoretical aspects and the power quality improvement techniques are presented and discussed. Power electronic devices are then presented, modelled and controlled. Original disturbance identification, power management and current/voltage control methods have been proposed, tested and analysed. A flexible test-bench, composed of a series and a shunt compensator, has been designed and built in order to test the studied control algorithms. These tests have permitted to experimentally evaluate and validate the proposed control algorithms and to make evident several problems that are not always visible on the theory. The conclusions outline the main short and mid term objectives and challenges in the field of power quality improvement devices.La thèse a trait aux systèmes de l'électronique de puissance dédiés aux applications distribution électrique. Une attention particulière a été portée sur l'amélioration de la qualité de l'énergie. A cet effet, les aspects théoriques et les techniques d'amélioration sont décrits et discutés. Les convertisseurs de l'électronique de puissance à même de répondre à la problématique qualité sont ensuite introduits, modélisés et commandés. Des techniques originales d'identification de perturbations, de gestion des puissances actives et réactives ainsi que des commandes éloignées sont conçues, testées en simulation et analysées. Les applications retenues sont le compensateur série à base d'onduleur de tension et le filtrage actif shunt. Ces résultats sont ensuite confrontés à l'expérimental sur un banc conçu et réalisé à cet effet. L'expérience, si elle a conforté la théorie, a permis également de mettre en exergue les problèmes souvent occultés par la théorie. La conclusion reprend ces constatations et trace les objectifs à court et moyen terme

Sur les systèmes de l'électronique de puissance dédiés à la distribution électrique (application à la qualité de l'énergie)

La thèse a trait aux systèmes de l'électronique de puissance dédiés aux applications distribution électrique. Une attention particulière a été portée sur l'amélioration de la qualité de l'énergie. A cet effet, les aspects théoriques et les techniques d'amélioration sont décrits et discutés. Les convertisseurs de l'électronique de puissance à même de répondre à la problématique qualité sont ensuite introduits, modélisés et commandés. Des techniques originales d'identification de perturbations, de gestion des énergies actives et réactives ainsi que des commandes éloignées sont conçues, testées en simulation et analysées. Les applications retenues sont le compensateur série à base d'onduleur de tension et le filtrage actif shunt. Ces résultats sont ensuite confrontés à l'expérimental sur un banc conçu et réalisé à cet effet. L'expérience, si elle a conforté la théorie, a permis également de mettre en exergue les problèmes souvent occultés par la théorie. La conclusion reprend ces constatations et trace les objectifs à court et moyen terme.GRENOBLE1-BU Sciences (384212103) / SudocSudocFranceF

Advanced Solutions in Power Systems: HVDC, FACTS, and Artificial Intelligence: HVDC, FACTS, and Artificial Intelligence

International audienc

Optimal Economic Exploitation of Hydrogen Based Grid-Friendly Zero Energy Buildings

International audienc

Transforming triangulations in polgonal domains

SIGLEAvailable from British Library Document Supply Centre- DSC:9106.1605(CU-DAMTP-NA--13/1991) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Optimal economic exploitation of hydrogen based grid-friendly zero energy buildings

This paper presents economically optimized energy and power management strategies for grid-friendly hydrogen based Zero Energy Buildings (ZEBs). The proposed energy management strategy is an adaptative optimization-based strategy that minimizes the operation cost of the facility taking into account RES generation prediction errors. It is shown that with an Adaptative Optimized Five-step Charge Controller (AOFC2) the use of the different equipment is optimized and the overall operation cost is minimized considering the entire life of the facility. The proposed energy management strategy is coordinated with power management strategies to offer advanced functionalities (peak-shaving, reactive power control and back-up service) that provide added-value to the facility. The paper demonstrates by means of offline and real-time simulations, that an adequate energy and power management structure permits the optimal economic exploitation of an advanced ZEB (that includes an energy storage system), providing not only a zero energy annual balance but also interesting added-value features to the grid and to the local consumers.Peer ReviewedPostprint (published version

Analytical Models of Multiphase Isolated Medium-Frequency DC-DC Converters

This paper presents new analytical equations, parametrized with respect to the number of converter phases, for multiphase isolated dc-dc topologies. This paper describes five multiphase isolated converter models, as well as their level of accuracy. Based on these new parametric models, a thorough comparative among various common high-power converter topologies is carried out, highlighting the best topology regarding efficiency, cost, and power density. The analytical results are firstly compared and verified using PLECS simulation software, and validated finally by experimental measurements with a 10-kW/20-kHz/500-V configurable laboratory prototype. Due to the low computation cost and accuracy, the developed analytical models provide important insights for optimization-based design methodologies. Furthermore, this paper highlights, depending on the targeted application and objectives, the benefits of each analyzed converter configuration