Downloaded 490 times
Uploaded byPrashant Kumar
Current source inverter
This document summarizes a seminar presentation on current source inverters (CSI). It introduces CSI and compares them to voltage source inverters. CSI use thyristors as self-commutating switching devices and do not require antiparallel diodes for current reversal. The document outlines the contents which include single phase CSI with ideal switches, advantages and disadvantages of CSI, single phase capacitor commutated CSI, and single phase auto sequential commutated inverter. Advantages of CSI include not requiring feedback diodes, simple commutation, and inherent short circuit protection for the supply. Disadvantages include high reverse voltages requiring devices like SCRs and continuous discharging of commutating
In this document
Powered by AI
Seminar introduction for Current Source Inverters presented by Shimi S.L Prashant Kumar.
Topics include Introduction, Single phase CSI, advantages/disadvantages, and specific types of invertors.
Describes applications of CSI: motor control, induction heating, etc., with devices used like thyristors and transistors.
Focuses on single phase CSI utilizing ideal switches for different load types.
Comparison of CSI and VSI, including requirements for voltage and current reversal.
Highlights advantages such as no feedback diodes required, simple commutation, and inherent short circuit protection.
Details drawbacks including high reverse voltage issues affecting device choices, necessitating specific configurations.
Introduces the concept of single phase Capacitor Commutated CSI.
Discusses key design considerations for Current Source Inverters.
Focus on the architecture and functioning of the Auto Sequential Commutated Inverter.
More Related Content
Similar to Current source inverter
Current source inverter
- 1. Seminar on Current SourceInverter Presented to: Presented by: Shimi S.L Prashant Kumar Asst. Professor Roll: 142517 NITTTR; Chandigarh I&C(Regular)
- 2. CONTENTS Introduction Singlephase CSI with Ideal Switches Advantages & Disadvantages of CSI Single phase Capacitor Commutated CSI Single phase Auto Sequential Commutated Inverter(ASCI)
- 3. Introduction Use of CSI:- •Speed Control of ac motor • Induction Heating • Lagging Var Compensation • Synchronous motor starting VSI:- V I as Load CSI:- I V as Load e.g In IM; Tload ; Tdeveloped; Speed No Acceln/No Deacceln Thyristor is used as self-commutated switching device. Transistor is used as self-commutated switching device.
- 4. Single phase CSIwith Ideal Switches For C load
- 5. From Waveform; To=2Tin i.e fin=2fo In CSI; For Voltage Reversal , Diode is not required. In VSI; For Current Reversal, Antiparallel Diode required.
- 6. Advantages of CSI Feedback diode are not required in CSI. Commutation is Simple. Inherently, there is Short Circuit protection for supply when incoming thyristor are switched on before the outgoing thyristor become off. For C load i.e PF leading load, Load commutation (Natural Commutation) takes place. Though for lagging PF load, Forced Commutation Needed. (1-phase capacitor Commutated CSI with R Load)
- 7. DisAdvantages of CSI The load applies high reverse voltage across the device during commutation process, therefore the devices having low reverse voltage blocking capacity such as GTO, IGBT & other transistor are generally not preferred. Here we prefer SCR because it has high reverse voltage blocking capacity. When commutating capacitor is directly connected across the load then it will be continuously discharging through the load even at steady state condition. To avoid this property, we must connect blocking diode between commutating capacitor. (Single phase Auto Sequential Commutated Inverter(ASCI))
- 8. Single phase CapacitorCommutated CSI
- 10.
- 11. Single phase AutoSequential Commutated Inverter