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CHAPTER 4: MOTOR AND MATRIX CONVERTER MODEL Impedance [kΩ] Impedance [Ω] 20 15 10 5 0 −5 −10 4 2 0 −2 −4 −6 −8 0.1 1 10 Frequency [MHz] Figure 4.8: Motor’s model differential mode fitting C2 R1 C1 L1 L2 R2 Figure 4.9: Matrix input capacitor equivalent network 0.1 1 10 Frequency [MHz] Figure 4.10: Matrix input capacitor measured and fitted impedance 47 Model [Re] Model [Im] Meas [Re] Meas [Im] Model [Re] Model [Im] System [Re] System [Im]
CHAPTER 4: MOTOR AND MATRIX CONVERTER MODEL Parameter Optimized Value C1cmi C2cmi Lcmi Rcmi C dmi L dmi R dmi 44.15nF 4.69nF 77.59nH 99.37Ω 6.8nF 57.35nH 14.12kΩ Parameter Optimized Value C1cmo C2cmo L1cmo L2cmo R1cmo R2cmo C dmo L dmo R dmo 2.64nF 415.2pF 187.8nH 610nH 51.63kΩ 1.26kΩ 719.6pF 257.9nH 31.13kΩ Table 4.5: Matrix converter input and output parasitics model values To further simplify the modelling for the converter this has been considered as the sum of two separate sections. The reason being that the IGBTs, when the board is not powered, act as an open circuit practically splitting the converter in two separate parts: one for the input with just some parasitic capacitive coupling between the tracks, and one for the output with the current sense transducers and the current direction sense circuitry. To measure properly the output parasitics impedance, the diodes used for the current direction sensing have been short circuited to emulate their conducting state. This is because they would otherwise act as a barrier for the low voltage signal used by the impedance analyser, effectively insulating the part of the matrix converter that comes after them. The measurements used to derive the system HF model are the usual two: differential and common mode, measured both at the input and at the output of the converter. For the modelling some considerations on the measurements helped to design the HF network: because for the CM measurements the parasitics components line to line will be shorted, only the parasitics components line to ground will play a role in the measurement, allowing a partial characterization of the parasitic network. Once the CM parameters have been identified their value will be taken into account to characterize the DM measurement. 4.4.1 Input and output CM impedance characterization The common mode impedance measurement is the easiest to characterize because it consists only of the parasitics components between the lines shorted together and the ground (-cm components in the model). Some components in the model were identified from the topology, like the series capacitor (because there is no resistive path between the lines and ground) and the series inductor to represent the inductive behaviour of 48
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EMI Filter Design for Matrix Conver
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that may involve long Finite Elemen
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CONTENTS 3.1 Introduction . . . . .
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CONTENTS B External DLL 118 B.1 C c
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LIST OF FIGURES 2.10 Measurement at
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CHAPTER 7: FILTER DESIGN AND REALIZ
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CHAPTER 7: FILTER DESIGN AND REALIZ
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CHAPTER 8 Filter realization and ex
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CHAPTER 8: FILTER REALIZATION AND E
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CHAPTER 9 Conclusions and Further w
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APPENDIX A Scientific Publications
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B.1 C code APPENDIX B External DLL
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APPENDIX B: EXTERNAL DLL Tseq_Pulse
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APPENDIX B: EXTERNAL DLL B.2 MAST c
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References [1] RTCA Incorporated. R
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REFERENCES nious drives. In Europea
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REFERENCES [48] D.F. Knurek. Reduci
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