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Current Source Inverter and Voltage Source Inverter

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Topology in the conventional inverter differentiated on the basis of the input to the inverter.

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Current Source Inverter and Voltage Source Inverter

  1. 1. CURRENT SOURCE INVERTER(CSI) & VOLTAGE SOURCE INVERTER(VSI) Presented by- Sadanand.C.Purohit G.E.S.R.H.Sapat College of Engineering, Nasik (University of Pune), Maharashtra, India
  2. 2. INDEX  What is inverter.  What is Current source inverter(CSI).  Working of CSI.  What is Voltage source inverter(VSI).  Working of VSI.
  3. 3. INVERTER..  We use converter as a generic term to refer power conversion.  Inverter refers to the converter when the average flow is from DC to AC side.
  4. 4. CURRENT SOURCE INVERTER  A current-source inverter (CSI) is one in which the source current is predetermined and the load impedance determines the output voltage.  The supply current cannot change quickly.  The current is controlled by series dc supply inductance.
  5. 5. CSI
  6. 6. CONSTRUCTION...  The type of operation in this case is Auto- Sequential Commutated Inverter (ASCI).  In this circuit, six thyristors, six diodes, three capacitors are needed here.
  7. 7. WORKING OF CSI.  For 3 phase CSI
  8. 8. WORKING OF CSI MODE 1
  9. 9. MODE 2
  10. 10. MODE 3
  11. 11. CSI.... Advantages • Thyristor used for commutation are simpler • The peak current flow through thyristor is limited to safe value. Disadvantages • It needs a extra converter stage. • At light load it has sluggish performance & stability problem. Application • AC motor drives.
  12. 12. VOLTAGE SOURCE INVERTER.  A voltage-source inverter (VSI) is one in which the dc input voltage is essentially constant  Feedback diodes are necessary.  Classification:- series, parallel, bridge inverter
  13. 13. VSI Advantages • Output voltage waveform does not depend on type of load. • Size is small. Disadvantages • Protection against short circuit is difficult. Application • UPS • AC drives
  14. 14. VOLTAGE SOURCE INVERETER There are six combinations of conducting switches during an output cycle:- (Sw5, Sw6, Sw1), (Sw6, Sw1, Sw2), (Sw1, Sw2, Sw3), (Sw2, Sw3, Sw4), (Sw3, Sw4, Sw5), (Sw4, Sw5, Sw6).
  15. 15. Application of Current Source Inverter
  16. 16. CSI FED INDUCTION MOTOR  A three phase filter capacitor CS is required for the commutation of switching devices  CSI drives employ self commutating devices such as gate turn-off thyristors (GTOs)  Pulse width modulation (PWM) techniques can be used to get improved output currents and voltages
  17. 17. CSI FED INDUCTION MOTOR  It is an attractive solution for high-power applications due to its regenerative capability.  A large dc link inductor connected at the output of the phase controlled rectifier  Suitable for fan and pump type of load  smoother set of output voltage waveforms suitable for driving ac motors
  18. 18. CHARACTERISTICS.  Simple converter topology,  Inherent four quadrant operation,  Reliability,  Motor friendly waveforms with  Low dv/dt.
  19. 19. CONTINUED..  The current-source inverter (CSI) topology offers a number of advantages: 1) short-circuit protection, 2) low output voltage 3) instantaneous and continuous regenerative capabilities. Disadvantages;  Poor and variable overall input power factor
  20. 20. Application of Voltage Source Inverter
  21. 21. WHAT IS FACTS  “Alternating current transmission systems incorporating power electronics based and other static controllers to enhance controllability and Available Power Transfer Capacity”.  The major problems faced by power industries in establishing the match between supply and demand are: 1) Transmission & Distribution; supply the electric demand without exceeding the thermal limit. 2)In large PS, stability problems causing power disruptions and blackouts leading to huge losses.
  22. 22. VSI BASED FACTS  FACTS controllers provide fast and reliable control over the three main transmission parameters, i.e., voltage magnitude, phase angle and line impedance to facilitate optimal power system performance.  Static synchronous compensator, static synchronous series compensator and unified power flow controller are the voltage source inverter based FACTS devices
  23. 23. VSI BASED FACTS  It is composed of a VSC and its associated shunt connected transformer with system bus.  The transformer is used as a link between the VSI and the system bus
  24. 24. VSI BASED FACTS CONTROLLERS  Includes dc-ac inverters to exchange shunt or series reactive power with the transmission system.  To enhance the power flow over the transmission line the parameters namely voltage, impedance or angle must be adjusted.
  25. 25. FACTS CONTROLLERS  The shunt connected compensator (STATCOM) is used to control the transmission line voltage.  The series connected compensator (SSSC) controls the effective line impedance, XL  The UPFC controls all variables (voltage, impedance and angle) selectively or concurrently.
  26. 26. CONTINUED..  VSI based FACTS devices have several advantages such as : 1)being small/compact 2)High response speed 3) No harmonic pollution.
  27. 27. THANK YOU

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