dc2ac2_v_0410_ddy.mdl

逆变器仿真程序可以进行DC/DC的工程进行仿真

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	  Name			  "Pierre Giroux, Gilbert Sybille\nPower Syste"
"m Laboratory, IREQ\nHydro-Quebec"
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	  Name			  "This example of AC-DC-AC converter illustra"
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	  Name			  "A  60 Hz, voltage source feeds a 50 Hz, 50 "
"kW load through an  AC-DC-AC  converter. \n\nThe 600V, 60 Hz voltage obtained"
" at secondary of the Wye/Delta transformer is first rectified by a six pulse "
"diode bridge.\nThe filtered DC voltage is applied to an IGBT two-level invert"
"er generating 50 Hz.\nThe IGBT inverter uses Pulse Width Modulation (PWM) at "
"a 2 kHz carrier frequency.\nThe circuit is discretized at a sample time of 2 "
"us\n\nThe load voltage is regulated at 1 pu (380 V rms) by a PI voltage regul"
"ator using abc_to_dq and dq_to_abc transfomations. \nThe first output of the "
"voltage regulator is a vector containing the three modulating signals used by"
" the PMW Generator\nto generate the 6 IGBT pulses. The second output returns "
"the modulation index. \n\nThe Discrete 3-Phase PWM Pulse Generator is availab"
"le in the Extras/Discrete Control Blocks library. \nThe voltage regulator has"
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"nts.\nIn order to allow further signal processing, signals displayed on  Scop"
"e1 block  (sampled at simulation sampling rate of 2us )\nare stored in a  var"
"iable named 'psbbridges_str' (structure with time) .\n "
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	  Name			  "Start the simulation. After a transient per"
"iod of approximately  50 ms, the system reaches a steady state.\nObserve  vol"
"tage waveforms at  DC bus, inverter output  and load on Scope1.\nThe harmonic"
"s generated by the inverter around around multiples of 2 kHz are filtered by "
"the  LC filter.\n\nAs expected the peak value of the load voltage is 537 V (3"
"80 Vrms). \nIn steady state, the mean value of the modulation index is m = 0."
"80 and the mean value of the  DC  voltage is 778 V.  \nThe fundamental compon"
"ent of 50 Hz voltage burried in the chopped inverter voltage is therefore:\nV"
"ab = 778 V * 0.612 * 0.80 = 381 V rms\n\nOnce  simulation is completed, open "
"the Powergui and select  'FFT Analysis' to display the 0 - 7000 Hz frequency "
"spectrum of signals saved \nin the 'psbbridges_str' structure. The FFT will b"
"e performed on  a 2-cycle window starting at t=0.1-2/50 (last 2 cycles of rec"
"ording). \nSelect input labeled 'Vab Load' . Click on Display and observe the"
" frequency spectrum of last 2 cycles.\nNotice harmonics around multiples of t"
"he 2 kHz carrier frequency. Maximum harmonic is 1.4 % of fundamental and THD "
"is 2%. \n\nObserve diode currents on trace 1 of Scope2, showing commutation f"
"rom  diode 1 to diode 3.  Also observe on trace 2 currents in\nswitches 1 and"
" 2 of the IGBT/Diode bridge (upper and lower switches connected to phase A). "
"These two currents are complementary.\nA positive current indicates a current"
" flowing in the IGBT, whereas a negative current indicates a current flowing "
"in the antiparallel diode. "
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