This paper deals with the design and the final implementation of a low-cost active shielding system for the mitigation of magnetic fields generated by electrical installations like power lines or substations. In this paper a new working prototype is built and tested. It is shown that the developed control strategy is effective also for field sources with complex geometries. Moreover, a real-time optimizer is added to the control strategy in order to guarantee the minimization of the source field at any working conditions of the source (i.e. different from the rated power). The control algorithm and the real-time optimizer are fully described in the paper, moreover, their behavior is verified through simulations and experimental tests.
ICNIRP, Guidelines for limiting exposure to time-varying electric and magnetic fields (1 Hz to 100 kHz). Health Phys99(6) (2010), 818–836.
2.
C95.6 – IEEE Standard for Safety Levels with Respect to Human Exposure to Electromagnetic Fields, 0–3 kHz.
3.
Reta-HernándezM. and KaradyG.G., Attenuation of low frequency magnetic fields using active shielding. Electr. Power Syst. Res.45 (1998), 57–63.
4.
IppolitoL. and SianoP., Using multi-objective optimal power flow for reducing magnetic fields from power lines, Electr. Power Syst. Res.68 (2004), 93–101.
5.
HabiballahI.O.FaragA.S.DawoudM.M. and FirozA., Underground cable magnetic field simulation and management using new design configurations, Electr. Power Syst. Res.45 (1998), 141–148.
6.
CanovaA.BavastroD.FreschiF.GiacconeL. and RepettoM., Magnetic shielding solutions for the junction zone of high voltage underground power lines, Electr. Power Syst. Res.89 (2012), 109–115.
7.
BarbaricsT. and KisP., Magnetic shielding on low-frequency, International Journal of Applied Electromagnetics and Mechanics13(1–4) (2001), 441–446.
8.
BottauscioO.ChiampiM.ChiarabaglioD.FiorilloF.RocchinoL. and ZuccaM., Role of magnetic materials in power frequency shielding: numerical analysis and experiments, In IEE Procedings of Generation, Transmission and Distribution148 (2001), pp. 104–110.
9.
BottauscioO.ChiampiM. and ManzinA., Numerical analysis of magnetic shielding efficiency of multilayered screens, IEEE Trans. Magn.40(2) (2004), 726–720.
10.
San SegundoH.B. and RoigV.F., Reduction of low voltage power cables electromagnetic field emission in MV/LV substations, Electr. Power Syst. Res.78 (2008), 1080–1088.
11.
SaitoT., Open-type magnetic shielding method, International Journal of Applied Electromagnetics and Mechanics33(3–4) (2010), 891–899.
12.
BavastroD.CanovaA.GiacconeL. and MancaM., Numerical and experimental development of multilayer magnetic shields, Electric Power Systems Research116 (2014), 374–380.
13.
Mitigation techniques of power frequency magnetic fields originated from electric power systems. Technical Report Working group C4.204, International Council on Large Electric Systems (CIGRE’), 2009, ISBN: 978-2-85873-060-5.
14.
JonssonU. and SjödinJ.O., Optimized reduction of the magnetic field near Swedish 400 kV lines by advanced control of shield wire currents. test and economic evaluation, IEEE Transactions on Power Delivery9(2) (April 1994), 961–969.
15.
OkazakiY.YanaseS. and SugimotoN., Active magnetic shielding with magneto-impedance sensor, International Journal of Applied Electromagnetics and Mechanics13(1–4) (2001), 437–440.
16.
CruzP.IzquierdoC.BurgosM.FerrerL.LlanosC. and PachecoJ., Magnetic field mitigation in power lines with passive and active loops, In: Proc. CIGRE, 2002, pp. 36–107.
17.
BarsaliS.GiglioliR. and PoliD., Active shielding of overhead line magnetic field: Design and applications, Electric Power Systems Research110 (May 2014), 55–63.
18.
BuccellaC.FelizianiM. and PrudenziA., Active shielding design for a MV/LV distribution transformer substation, In 3rd International Symposium on Electromagnetic Compatibility (May 2002), pp. 350–353.
19.
GarziaF. and GeriA., Active shielding design in a full 3D space of indoor MV/LV substations using genetic algorithm optimization, In IEEE International Symposium on Electromagnetic Compatibility1 (August 2003), pp. 197–202.
20.
SergeantP.L.Van den BosscheA. and DupréL., Hardware control of an active magnetic shield, IET Science, Measurement & Technology1(3) (May 2007), 151–159.
21.
CanovaA.del Pino LópezJ.C.GiacconeL. and MancaM., Active shielding system for elf magnetic fields, IEEE Transaction on Magnetics51(3) (2015).
22.
del Pino LópezJ.C.GiacconeL.CanovaA. and Cruz-RomeroP., Design of active loops for magnetic field mitigation in MV/LV substation surroundings, Electric Power Systems Research119 (2015), 337–344.
23.
FemiaN.PetroneG.SpagnuoloG. and VitelliM., Optimization of Perturb and Observe Maximum Power Point Tracking Method, IEEE Transactions on Power Electronics20(4) (Jul 2005), 963–973.
