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Bulletin technique

Power Quality Constraints in Islanded Microgrids

26 mai 2015

  • Today, advances in power electronic techniques allow for the use of Renewable Energy Sources (RES) in various configurations. Indeed, thanks to the use of power electronics, RES can be connected to main grids or distributed interconnected multi-source grids with storage systems and loads. A microgrid (MG) is different by nature of its topology from a connected electrical grid, which can be regarded as an unlimited power source, such that load variations do not affect its stability.

    In contrast, in a MG, sudden large changes in loads can result in transients of large amplitude in the AC bus. Additionally, the large propagation of non-linear loads and extensive use of electronic equipment such as power converters operating at high frequency can reduce power quality requirements, particularly in the MG. The power quality can also be affected in the connected grid by the use of increasingly non-linear loads, whereas in MG configurations, the power quality may be very poor in the aforementioned conditions.

Large-Scale Active and Reactive Load Emulators on TCE’s Microgrid

01 mai 2015

  • Technical issues related to both operation and control of Microgrids (MC) are substantial. Indeed, the control of a large number of Distributed Generation (DG) sources with most likely conflicting requirements and restricted communication between the different devices is a highly important issue necessitating the implementation of distributed intelligence techniques.

    In the framework of MC, several technical issues such as an instantaneous active and reactive power control and power quality requirements will be investigated by using scalable devices which can emulate the real behaviour of a large scalable MC. The TechnoCentre éolien (TCE) has a large scalable Wind/Diesel Microgrid with active and reactive load emulators of up to 200 kVA. These emulators, which are based on power electronics techniques, can emulate any active and reactive load profile for autonomous of power systems.

Electrodynamic Characterization of a Direct-Drive Wind Turbine

14 avril 2015

  • For automation requirements, it is important to have an adequate and accurate model of the system to be controlled in order to develop robust and efficient control algorithms. This model can be obtained through physical modelling using knowledge modelling techniques. However, several physical models are often difficult or impossible to develop. To overcome this difficulty, other methods based on a learning approach are adopted to develop representational models that describe the input-output behaviour of the process. This method is called dynamical identification.

    This technical paper presents a dynamical identification of a direct-drive (DD) transverse flux (TF) permanent magnet synchronous generator (PMSG) based on a representational modelling approach. The use of TF PMSGs has become an attractive alternative for wind turbine systems. Indeed, these machines are characterized by a stronger relationship between the electromagnetic torque and the weight of active materials. The specific pole pair modular structure could eliminate or diminish the gear ratio compared to conventional wind turbines. (En anglais seulement)

Battery Bank Performance and State Of Health Diagnostic in Hybrid Wind-Diesel Power System

01 avril 2015

  • To cope with the growing demand for energy and the growing scarcity of fossil energy sources, renewable energy sources (RES) are becoming increasingly integrated in power systems. However, the fluctuating and intermittent nature of RES generally requires the use of buffer systems. These systems also serve to overcome the temporal decoupling between production and demand. Despite their low specific energy, batteries are the most attractive Energy Storage System (ESS) due to their maturity, ease of installation and their ability to provide high surge currents.

    However, the use of batteries in Hybrid Power Systems (HPS) results in the rapid degradation of batteries and premature aging. The TechnoCentre éolien (TCE) conducts research projects on the integration of RES in microgrids for remote applications. This technical paper discusses the characterization of the aging phenomena of sealed lead-acid batteries in HPSs and the investigation of suitable solutions to extend battery lifespans. (En anglais)

Dynamic Smart Microgrid

18 mars 2015

  • In the coming weeks, the TechnoCentre éolien (TCE) will be offering our partners a short series of eight technical bulletins which will highlight the full experimental research potential of the TCE and its Dynamic Smart Microgrid (click here) as related to the integration of renewable energy.

    The publication of these papers will conclude with the presentation of a workshop which will address challenges in the following areas: hybrid wind energy systems, the mining industry, large islanded grids and smart grids. (En anglais seulement.)