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-
to manage the intermittent nature of renewable energy; and also, to ensure the stability and security of the network.
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 :
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.
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.
Contact : Piotr.DWORAKOWSKI supergrid-institute.com