Performance Improvement of Multi Level Inverter fed Vector Controlled Induction Motor Drive for Low Speed Operations

Abstract

LED industries are currently focusing on the thermal management to reduce the junction temperature as well as the total thermal resistance for high power solid state lighting application. Metal powder or metal oxide filled thermal paste (TP) using as a thermal interface material is one kind of approach to solve the problem. In connection with that, milled TiO 2 and Cr 2 O 3 powder were mixed in different ratio with commercial thermal paste. Cumulative structure function (CSF) analysis was used to characterize the metal oxide mixed thermal paste as thermal interface material (TIM) for 3W LED. TiO 2 mixed TIM showed good performance on reducing junction temperature (ΔT J = 1.19 ºC) for driving current at 350 mA. Overall, TiO 2 mixed TP shows low value of board to heat sink thermal resistance (R th-b-hs ) compared to all other results. Energy Dispersive Spectrum (EDS) analysis results revealed the percentage of mixed powder as low when compared with mixed ratio. O 2 content in mixed paste showed immense effect on reducing total thermal resistance.

Performance analysis of a Scalar Coupled and Decoupled PWM Technique for a Three Level symmetrical Dual Inverter Fed OEWIM Drive

“…In [28], a modulation strategy was introduced in which the pulse time of one of the inverters is varied to reduce the voltage THD in DI. A unified SVM strategy was proposed in [29]. For reducing the switching losses in a DI, an SVM strategy was proposed in [30], in which sector identification is not necessary.…”

Coupled random PWM technique for dual inverter fed induction motor drive

“…Regular two-level inverter fed vector controlled IM drives generate poor quality of output voltage, high common mode voltage (CMV) and moreover they are suitable for low power applications [6]- [10]. Multilevel inverter fed IM drives are possible solution for high power applications.…”

Level Shifted Discontinuous PWM Algorithms to Minimize Common Mode Voltage for Cascaded Multilevel Inverter Fed Induction Motor Drive

“…Two remaining PWM techniques are commonly used in various fields because of their excellent PWM qualities. The DPWM methods of two-level inverters have been studied for many years, and they are introduced as an approach to reduce the switching loss [5][6]. DPWM methods can be realized using space vector PWM approach by eliminating one from the redundant zero vectors in the switching state sequence ; or carrier-based PWM ones by adding offset to make some leg- voltage attain one of two dc-rail levels [7][8][9][10].…”