This paper focuses on a study of an hybrid energy storage system constituted by lead acid batteries and supercapacitors and designed to work in a low voltage DC microgrid supplying by photovoltaic sources and dedicated to building application. We proposed a simulation methodology in order to evaluate supercapacitors performances and behaviors for long term analysis. We quantify their impacts on battery lifetime and on the levelized cost of electricity of our storage system. This analysis has been validated on the micro-grid developed in LAAS-CNRS in ADREAM building integrated photovoltaic. The power profiles used for our work correspond to 1 years production and consumption data from 100m 2 floor of the building. Results of comparative studies with different load profiles, SC costs and methods to estimated battery lifetime are presented and discussed.
This paper proposes to analyze the impact of active phase count control in DC/DC multi-phase bi-directional interleaved converter dedicated to energy storage system in low voltage DC micro grid for building integrated photovoltaic application. We focus our interest on the energy saved with an adaptive phase count control for real working conditions. To validate our approach a long term analysis was done based on a several years database of photovoltaic production and consumption power profile recorded in our laboratory building. To estimate the impact of our adaptive phase count control we built a model of converter efficiency for a large scale of operating points. Its parameters were identified through experimental measurements made on a bi-phase DC/DC bidirectional converter developed in LAAS-CNRS. Pertinence of APC control is estimated for 5 years simulation process and different load profiles. Results obtained in case of lightning network load profile, show that the energy lost without adaptive phase count control correspond to 4.22% of the energy exchange, against 3.72% with adaptive phase count control. This result correspond to a decrease of looses of 12%. In order to study the impacts on a long term analyze we choose to discuss these results regarding the energy saved with adaptive phase count control. To complete our work we propose a comparative analysis with two different load profiles with details by month and days.
We present a study of work limits for two dc-dc converters associated in series. This type of structure is usually used to maximize the electrical energy production of a photovoltaic system when it is subjected to shading. We expose our study to research these limitations in the case of expensive shading. DC-DC converters, series connections, photovoltaic systems, optimal matching in series connections Study of DC-DC output serial connection ranges for photovoltaic distributed systems EL BASRI YOUSSEF EPE'14 ECCE Europe
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