Common mode current paths and their modeling in PWM inverter-fed drives

Kempski, A.; Smoleński, Robert; Strzelecki, Ryszard

doi:10.1109/psec.2002.1022396

Cited by 34 publications

(16 citation statements)

References 6 publications

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“…: Tech. 59 (4) 2011 by the converter [14][15][16]. The spectrum envelope is typical for damped oscillatory mode waveforms of frequency equal to 70 kHz that is formed in resonant circuits created by input line reactors, impedance of the grid and heat sink-to-DC link capacitances, whereas the shape of the spectrum near frequencies that are multiple of the 40 kHz is connected with the frequency of the sample and hold (S&H) transistor switching synchronization signal and attenuation of the input resonant filter.…”

Section: Flow Of the CM Interferences Generated By Ac/dc/ac Convertermentioning

confidence: 99%

CM voltage compensation in AC/DC/AC interfaces for smart grids

Smoleński¹,

Jarnut²,

Benysek³

et al. 2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. In this paper the results of research connected with common mode (CM) interference generated by four-quadrant frequency converters and effective methods of CM voltage compensation are presented. The obtained results show that conducted CM interference generated by these converters in a low voltage (LV) grid can be transferred by means of parasitic couplings into a medium voltage (MV) network and can be observed at distant points under overhead MV lines. The compensation of the CM voltage sources on both the input and the output sides of the AC/DC/AC converter using proposed arrangement of compensators significantly reduces unwanted, EMC related, side effects accompanying the application of AC/DC/AC interfaces in Smart Grids.

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Section: Flow Of the CM Interferences Generated By Ac/dc/ac Convertermentioning

confidence: 99%

CM voltage compensation in AC/DC/AC interfaces for smart grids

Smoleński¹,

Jarnut²,

Benysek³

et al. 2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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“…A natural approach to the problem of interference spread analysis is to use the traveling wave approach. The usefulness of this method of analysis has been confirmed in papers concerning interference current paths in adjustable speed drives [14,15,[19][20][21][22]25]. It is important to note that power cables typically work in a wave impedance mismatching condition.…”

mentioning

confidence: 93%

Conducted EMI Issues in Smart Grids

Smoleński

2012

Conducted Electromagnetic Interference (EMI) in Smart Grids

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The relatively high level of the generated interference, especially in CISPR A frequency band, and observed malfunctions of electronic equipment caused by converters in relatively distant circuits made it necessary to carry out research of the interference penetration depth into the local grid. The commercially available 25 kW four-quadrant frequency converter (FC2 , Table A.6) with 10 kW asynchronous machine (IM3, Table A.4) has been used in the research on interference flow. Preliminary measurements have been taken in a normalized system comprising the EMI receiver and Line Impedance Stabilization Network (LISN). Figure 3.1 shows the results of measurements using peak and average detectors and typical intermediate frequency bandwidth (IF BW) equal to 200 Hz and 9 kHz for CISPR A and CISPR B frequency range, respectively [14,16,[26][27][28].In order to asses interference penetration depth into the electric grid CM interference currents have been measured in the PE wire of the converter supplied directly from local grid without LISN. The result of the performed measurement in CISPR A frequency band is presented in Fig. 3.2. The conformity of the shapes of the CM current and conducted EMI measured using LISN indicates that CM mode noises are mainly responsible for the high level of the emission introduced by the investigated converter.As has been stated in Chap. 2 the origin of CM interference is the CM voltage source, which inevitably exists in a system as a result of temporary electrical asymmetry at its neutral point. This asymmetry is caused by a pulse-width modulation strategy using a three-phase two-level converter bridge. The common mode voltage in 3-phase circuits is defined as one third of the sum of phase voltages. CM currents emerge as a result of transistor switching in the active rectifier and the inverter, due to a high du/dt value of the CM voltage. The experimental results presented in Figs. 1.12, 1.13 and 1.14 have shown the minor influence of the load state and quadrant of operation on both the level and the shape of the CM current, therefore in all of the cases reported the drive was operated in the forward motoring quadrant R. Smolenski, Conducted Electromagnetic Interference (EMI) in Smart Grids, 3 7 Power Systems,

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“…The CM currents split according to proportion of HF impedance of a PE cable wire (or shield) and HF impedance of the grounding arrangement between the grounding points of the inverter and the motor. The main return path for the CM currents passes via the heatsink to DC link capacitance [12], [13].…”

Section: Introductionmentioning

confidence: 99%