Internship “Rapid Control Prototyping and test of a small-scale active filter”
SUPERGRID INSTITUTE
Villeurbanne, FR
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SuperGrid Institute recruits Intern F / M

Rapid Control Prototyping and test of a small-scale active filter

SuperGrid Institute is an Institute for Energy Transition (ITE) a collaborative research platform in the field of low-carbon energy, bringing together the expertise of industry and public research in the logic of public-

private co-investment and close cooperation between all stakeholders of the sector.

The institute aims to develop technologies for the supergrid, which is the future electricity transmission network, using direct current and alternating current at very high voltages, designed to transport large-

  • scale energy from renewable sources remote from load centers, a significant portion of which are offshore, which will be in connection with flexible storage resources;
  • to manage the intermittent nature of renewable energy; and also, to ensure the stability and security of the network.

    General context

    Single-phase converters generate double-line frequency currents on the DC side of the converter. The magnitude of this intrinsic power pulsation has the same level than the DC power.

    In order to remove this pulsation, bulky electrolytic capacitors are required. As the ripple allowed on the voltage across these capacitors is limited to a few percent, the capacitance value as to be large to absorb the pulsating current (figure 1).

    When the volume and the weight of the converter are challenging, an active filter, called Power Pulsation Buffer, can be set on the DC bus.

    This converter generates a double line frequency current, of the same magnitude than the pulsating current but 180 phase shifted.

    The storage element of this buffer is still a capacitor but as it is placed behind a converter, a larger voltage ripple of the voltage across the capacitor is allowed, which drastically reduce the capacitance requirement.

    A more compact solution can then be obtained (figure 2).

    This system can be used anytime a single phase AC to DC conversion is realized : Photovoltaic, fuel cell, Uninterruptible Power Supply

    Figure 1 : passive power pulsation filtering

    Figure 2 : active power pulsation filtering

    Objectives / Missions

    The objective of the internship is to realize, implement the control and test a small scale prototype of the active filter inside our test cabinet.

    Work definition :

  • Support the engineer in charge of the design of the board of the active filter. If the candidate has experience in designing electronic boards, this task could be assigned to the candidate.
  • Implement the control and the modulation of the active filter with rapid-control prototyping solution on a Speedgoat controller (figure 3).
  • The Controller features a X86 processor and a FPGA. Both code for the X86 and bitstream of the FPGA will be generated from a Simulink model using Mathworks Coders.

  • Test the board and its control placed inside our test cabinet (AC and DC sources, AC / DC and DC / DC converters) (figure 4)
  • Conclusion on the performance of this system.
  • The internship will be realised in program 3 of SuperGrid Institute (P3-Power conversion technologies). The internship student will work in a research group of around 30 people.

    Figure 3 : Rapid control prototyping with Speedgoat controller (from : https : / / www.speedgoat.com / )

    Profile of the candidate

    Master or engineering school student in the last year of his / her studies. The student must have a good knowledge in power systems or power electronics, control, Matlab / Simulink and be comfortable with algorithms.

    Communicative skills in French or English are required.

    Other informations

  • Workplace : ITE SuperGrid Institute, Villeurbanne (69)
  • Internship period : September 2018 February 2019, 6 months
  • Recruitment : Applications to be submitted before the end of June 2018. The application has to include the internship title, candidate name, CV and the most recent transcript of academic qualifications.
  • Contact : Piotr.DWORAKOWSKI supergrid-institute.com

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