Abstract
In electric drive systems common mod voltage (CMV) is known as voltage between power line and ground. CMV causes negative effects on both electric engine and its driver whereas switching operation occurs in power devices. In addition switching frequency and its multiples in CMV cause electromagnetic and aqustic noises. In this paper a novel Fixed-Frequency chaotic switched sinusoidal pulse width modulation (FFCS-SPWM) is proposed. The cruial point in proposed FFCS-SPWM method is to obtained a new carrier wave by summation of carrier wave and its inverse form. In FFCS-SPWM method extra switching loses were reduced due to constant switching frequency. This method also applied to permanent magnet synchronous motor (PMSM) vector control system. The reduction of electromagnetic interference (EMI), aqustic noises and dv/dt stress effects that occur in CMV is simulated by proposed method. Moreover SPWM combined with chaotic-frequency chaotic switched (CFCS) is proposed to reduce the differential mode voltage (DMV) which occurs due to voltage between lines . Finally in this method switching frequency change chaotically and also in this paper it shown that, CFCS-SPWM provides to reduce EMI, aqustic noises which are caused by CMV and DMV
Highlights
common mod voltage (CMV) AND differential mode voltage (DMV) have some bad effects on PWM voltage based inverter
In this research simulation were done for c conventional SPWM, chaotic switching frequency PWM (CSPWM), FFCF-SPWM, FFRSSPWM chaoticfrequency chaotic switched (CFCS)-SPWM and randomfrequency random switched (RFRS)-SPWM
For power spectrum matlab periodogram was used. In simulation it is compared the effect of proposal method for CMV and DMV in view of reduction of electromagnetic interference (EMI) and acoustic noises
Summary
CMV AND DMV have some bad effects on PWM voltage based inverter. DMV can damage engine windings or reduce engine life under condition of immediately change occurs in high frequency inverter voltage. In lower switching frequency case especially engine/motor with a low leakage inductance has high current harmonic components that causes vibration, noise and loses [21]. There some paper about reduction of EMI and acoustic noise by using random PWM technics [23,24,30] Another problem appears in electrical driver is noises occurs during motor operation. The chaotic methods are applied to induction motor driver and obtained reduction in EMI, acoustic noises and mechanical vibration by Zheng [16,17]. Due to sudden sharp rising and falling in voltage high frequency harmonics occurs in switching operation This harmonic causes to damage seriously both on motor and driver circuit. In lower switching frequency motors whose leakage inductances are small and its harmonics in current are high cause vibration, noise and loses. In KW power applications switching frequency is selected interval between 3-25 KHz[21]
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