Simulation and design of inverter output RLCdv/dt filter based on Matlab
WANG Jia-xiao
（Shanghai Eagtop Electronic Technology Co.，Ltd.，Shanghai 201604，China）
Abstract：Aiming at the problems of when as the long cable was connected industry inverter to driving induction motor，led to the voltagereflection was happened，which caused overvoltage and high-frequency damped oscillation，aged and break-down the motor insulation andso on，the transmission line theory with motor system model analysis was studied and applied to RLC dv/dt filters design. First，byanalyzing the long cable transmission，the motor side voltage was effected on the inverter PWM output pulse voltage，the transmission
line - filter integrated system model was established，deduced specifically，and the fundamental method was presented to design of toworder RLC dv/dt filter. The corresponding formulas were derived and the cable length，cable parameters，voltage reflection coefficientparameters of the filter were found. Finally simulation with Matlab，and the design of the product in accordance with this method weretested specifically. The simulation results were verified by experimental data. The experimental results show that about the method of dv /
dt filter design. was feasibility effectiveness and high accuracy.
Key words：over-voltage；transmission-line theory；RLC dv/dt filter；reflection；pulse