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In this paper, a new control strategy is proposed to manage the electrical power of a hybrid trigeneration system composed of a concentrated photovoltaic and thermal captator, an electrical storage group (including lead acid batteries and supercapacitors), a genset and a lithium bromide absorption machine. The architecture is based on a double DC-bus configuration. An improved control management of...
Nowadays, the most widely used variable speed wind turbine type for unites above 1MW is doubly fed induction generator (DFIG). Because of the relative small rating of the power converters, wind turbines based on the DFIG are very sensitive to grid disturbances, especially to voltage dips during grid faults. In this paper, two control strategies of the stator flux, including a synchronous approach...
Nowadays, the wind market is dominated by doubly fed induction generator (DFIG) based wind turbines. However, they are very sensitive to grid faults due to the small rated power converters and direct connection to the grid. In order to improve its Low Voltage Ride-Through (LVRT) capability, this paper proposes a modified vector control strategy of the DFIG by considering the dynamics of stator flux...
A classical wind energy conversion system is usually a passive generator. Its power does not depend on the grid requirement, but entirely on the fluctuant wind condition. In this paper a DC-coupled wind/hydrogen/super-capacitor hybrid power system is studied. The purpose of the control system is to coordinate these different sources, especially their power exchange, in order to make the generated...
In this paper, we propose a grid-connected photovoltaic power system including batteries in order to provide prescribed reactive and real powers to the grid. According to the stochastic nature of the photovoltaic power, the main feature of the proposed system is to erase power fluctuations by designing a dedicated local control system. With batteries, the whole system is able to smooth the PV power...
A multi-machine multi-converter system formalism has been proposed to describe systems composed of several electrical machines and converters. This description points out coupling elements, which have to distribute energy. Control structures have already been proposed for systems with downstream coupling. This paper is focused on control structures for systems with upstream coupling. Several solutions...
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