Looking for a Tutor Near You?

Post Learning Requirement » x
Ask a Question
x

Choose Country Code

x

Direction

x

Ask a Question

x

Hire a Tutor
Dubai

Presentation On Neutral Point Clamped Inverter

Home > PowerPoint Slides > Presentation On Neutral Point Clamped Inverter
Published in: Engineering | Physics | Science
50 Views

Neutral point Clamped Inverter

Resmi C / Fujairah

8 years of teaching experience

Qualification: M.Tech

Teaches: Biology, Physics, Science, Maths, Geography, Social Studies, Chemistry, Mathematics, Others

Contact this Tutor
  1. MODEL E DIRECI* ER CONTROL FOR GRID CONNECTED NEUTRAL POINT CLAMPED CONVERTERS Guided By : Mrs.Sreedevi Bhas Asst. Prof. EEE dept. THEWS ENC,G_ COLLEGE Presented By: Resmi Chandran C M.Tech-PowerSystems Roll No:13
  2. 5129 OVERVIEW OBJECTIVES MOTIVATION LITERATURE REVIEW SYSTEM CONFIGURATION BLOCK DIAGRAM PROPOSED CONTROL SCHEME SIMULINK MODELS AND OBSERVATIONS CONCLUSION REFERENCES THEWS ENC,G_ COLLEGE
  3. 5129 OBJECTIVE To study about various control strategies applied to GC VSI Predict the behaviour of the system Regulate real and reactive power within a set of symmetrical bound To study about Model Predictive Control Designing and simulation of grid connected NPC converters THD analysis of grid current THEWS ENC,G_ COLLEGE
  4. 5129 MOTIVATIONS Use of grid connected VSI's Use of DPC instead of classical controllers New control technique with fast response and simple algorithm Selection of active voltage sectors not required High power applications THEWS ENC,G_ COLLEGE
  5. INTRODUCTION Different control methods are CCS FCS An extension of DPC • Suitable for grid connected applications VF technique is used THEWS ENC,G_ COLLEGE MPDTC MPDCC MPDPC 5129
  6. LITERATUREREVIEW SL NO 2. NAME OF AUTHOR J. Maciejowski T. Noguchi, H.Tomiki (DPC of PWM converter without power source voltage sensors) YEAR Apr 2007 June 2008 vol.34 WHAT THEY HAVE DONE • Predictive control with constraints • Frequency, Voltage, Current • Minimizing cost function • Similar to optimization technique • Controlling duty cycle .MPDTC & MPDCC • Along with optimization technology power delivered to the grid • Grid connnected applications • Stand alone applications DRAWBACKS • Failure to minimize switching frequency • MV applications
  7. LITERATUREREVIEW SL NO 3. 4. 5. NAME OF AUTHOR T. Geyer, M. Morari T. Geyer P. Cortes, J. Rodriguez YEAR Jun. 2009 Vol.56 March 2012 vol.17 Feb 2013 Vol.59 WHAT THEY HAVE DONE Direct torque control Achieve low switching level frequency • Provide trajectory path to flux .DCC • Controll torque,Flux and stator current • Delay compensation using MPC • NPC Converters • Time delay is used to rectify and mlnlrnlzlng errors DRAWBACKS • Stator current cannot controlled • Long time variations are
  8. 5129 SYSTEM CONFIGURATON Vdc Cl Fig. l. Representation of a 3 level,3 phase converter connected to the grid THEWS ENC,G_ COLLEGE
  9. 5129 BLOCK DIAGRAM Li THEWS ENC,G_ COLLEGE
  10. Of Cost flinction Prediction of trajectories abc THEWS ENC,G_ COLLEGE DC per (k) 5129 V'de(k),
  11. INVERTERS An inverter is an electrical circuit capable of turning DC power into AC power, while at the same time regulating the voltage, current, and frequency of the signal VSI & CSI : single phase & three phase (based on operation) bridge inverters, series & parallel inverters (based on connection) High frequency & low frequency inverters (based on frequency ) Square wave, pure sine wave & modified sine wave (based on o/p waveform) • 2 level & multi level inverters 5129 diode clamped ,flying capacitors & cascaded H bridge inverters THEWS ENC,G_ COLLEGE
  12. —POWER CIRCUIT OF 3 LEVEL NPC INVERTER 5129 Vao VC2 yc2 i2 eat 2 THEWS ENC,G_ COLLEGE Vao
  13. 3 LEVEL NPC INVERER Each phase consists of 4 switches and 2 diodes ( 2 pair of complementary switches) Configuration allows 27 switching states minimize THD Small dv/dt 19 different voltage vectors > 3 voltage levels at output 5129 dc /2, , — dc/2 THEWS ENC,G_ COLLEGE
  14. SWITCHING STATES FOR ONE PHASE OF INVERTER 5129 xl THEWS ENC,G_ COLLEGE x3 x4 Vdc/2 -Vdc/2
  15. Possible voltage vectors and switching states (+0,0) THEJUS COLLEGE
  16. According to space vector definition output voltage V -2/3 ( vao+ + a2vc0) Using this equation we can find out different voltage vectors under various switching states. 5129 THEWS ENC,G_ COLLEGE
  17. 5129 SIMULINK MODELS AND OBSERVATIONS THEWS ENC,G_ COLLEGE
  18. (IIHO 01 0 NNOO ANI "IVNOIINHANOO 353TIOD sn13HI
  19. 5129 VOLTAGE AND CURRENT WAVE FORM *WRIER VOLTAGE INVERTER Cu THEWS ENC,G_ COLLEGE
  20. 5129 3 LEVEL NPC INVERTER CONNECTED TO THE GRID THEWS ENC,G_ COLLEGE
  21. 5129 SUBSYSTEM WII THEIUS ENC,G. COLLEGE
  22. WO AV ? N (INV NOVI"IOA
  23. FFT ANALYSIS OF lg (THI) C/o) (a) Using 3 level NPC Inverter(1.59%) (b) Using Conventional 3 level 5129 THEWS ENC,G_ COLLEGE
  24. 5129 OBSERVATONS Switching frequency is reduced Grid side current and voltages having some distortions Quality of the output current , Smaller output ripple current The total +/- supply voltage is shared Better harmonic reduction than conventional 3 level VS THEWS ENC,G_ COLLEGE
  25. 5129 PREDICTIVE CONTROL OF NPC CONVERTER Behaviour of the system is predicted for each possible switching states The switching state minimizes the given cost function and applied to the next sampling interval They are suitable for medium to high power applications THEWS ENC,G_ COLLEGE
  26. SYSTEM WITH MP CONTROLLER: MP controller predicts the behavior of converter for each possible voltage vector on each sampling interval. Cost function is used to evaluate the voltage vector for the next sampling interval. Selection of optimal voltage vector and corresponding switching state is applied. MPC minimizes switching frequency. NHnization of cost finctbn n gid
  27. 5129 CONTROL REQUIREMENTS Load current and voltage reference tracking DC link capacitor voltages balance Reduction of the switching frequency THEWS ENC,G_ COLLEGE
  28. 5129 The cost function for the NPC inverter has the following composition g = Cost function and = real and imaginary components of predicted current vector I p and 113* = real and imaginary components of reference current vector I* = Weighting factors, which selects the switching states The switching state minimizes the cost function and applied to the next sampling period THEWS ENC,G_ COLLEGE
  29. 5129 FLOWCHARTOFMPDP Amy THEWS ENC,G_ COLLEGE
  30. SIMULINK MODEL OF MPDPC AND OBSERVATIONS 5129 THEWS ENC,G_ COLLEGE
  31. 5129 SIMULINK MODEL OF GRID CONNECTED NPC CONVERTER 1 THEWS ENC,G_ COLLEGE
  32. ?00 ?]?0
  33. SUBSYSTEM OF MPDPC CONTROLLER Igalpha x galpha Vgbeta x Igbeta 5129 3/2 THEWS ENC,G_ COLLEGE Igalpha Vgbeta galpha x Igbeta q
  34. 5129 SUSYSTEM OF MPDPC CONTROL THEWS ENC,G_ COLLEGE
  35. 5129 VOLTAGE AND CURRENT OUTPUT WAVEFO ACTIVE AND REACTIVE POWER THEWS ENC,G_ COLLEGE
  36. 5129 In the simulation, two cases are taken into account: Case l: Simulink model of grid connected NPC with LC filter Case 2: Simulink model of grid connected NPC with LCL filter THEWS ENC,G_ COLLEGE 36
  37. MATHEMATICAL EQUATIONS FOR MODELING AN NPC LCL Filter Design : Reduce current harmonics injected into the grid L, 5129 16* f p h — g rid c f -0.05 wgr,d * (U phase — grid THEWS ENC,G_ COLLEGE
  38. 5129 LC Filter Design : (2HfL) = 0.03V/NV 1 THEWS ENC,G_ COLLEGE t'bn vga vgc 38
  39. 5129 SIMULATION DIAGRAM OF GRID CONNECTED NPC WITH PV AS INPUT CASE 1: LC FILTER THEWS ENC,G_ COLLEGE
  40. 5129 VOLTAGE AND CURRENT OUTPUT WAVEFO ACTIVE POWER THEWS ENC,G_ COLLEGE
  41. 5129 SIMULATION DIAGRAM OF GRID CONNECTED NPC WITH PV AS INPUT CASE 11: LCL FILTER THEWS ENC,G_ COLLEGE
  42. 5129 VOLTAGE AND CURRENT OUTPUT WAVEFORW ACTIVE POWER THEIUS ENC,G. COLLEGE
  43. 5129 -SIMULATION DIAGRAM OF GRID CONNECTED NPC WITH PV + BATTERY CASE I:LC FILTER THEWS ENC,G_ COLLEGE
  44. VOLTAGE AND CURRENT OUTPUT ? VAVEFO ACTIVE POWER THEIUS ENGG_ COLLEGE
  45. 5129 SIMULATION DIAGRAM OF GRID CONNECTED NPC WITH PV + BATTERY CASE 11: LCL FILTER THEWS ENC,G_ COLLEGE
  46. VOLTAGE AND CURRENT OUTPUT WAVEFO THEWS ENGG. COLLEGE ACTIVE POWER
  47. CASE 1 : 5129 PV as input (a) FFT ANALYSIS (b) % THD analysis of grid current with (a) LC filter (b) LCL filter THEWS ENC,G_ COLLEGE
  48. CASE 11 • FFT ANALYSIS PV with Battery as input (a) (b) 5129 % THD analysis of grid current with THEWS ENC,G_ COLLEGE (a) LC filter (b) LCL filter 48
  49. OBSERVATIONS PV as Input PV + Battery as Input THD of LC 1.02 LCL 0.04 LC 1.31 LCL 0.02
  50. CONCLUSIONS Proposed MPDPC control, we can regulate the active and reactive power delivered to the grid Reduce grid current harmonic distortion Better harmonic compensations to eliminate adverse effects of distorted grid voltage on the grid current quality From the FET analysis ,it is clear that by using LCL filters high frequency current harmonics are reduced > It has good current ripple attenuation even with small inductance values. 5129 THEWS ENC,G_ COLLEGE
  51. REFERENCES [l] D. Quevedo, R. Aguilera, and T. Geyer, "Predictive control in power electronics and drives: Basic concepts, theory, and methods," in Adv.lnt. Contr. Power Electron. Drives, ser Studies in Computational Intelligence. Springer International Publishing, 2014, vol. 531, pp. 181-226. [2] T. Geyer, "Model predictive direct current control: Formulation of the stator current bounds and the concept of the switching horizon," IEEEInd. Appl. Mag., vol. 18, no. 2, pp. 47-59, Mar. 2012 [3] S. Larrinaga, "Predictive control of the 2L-VSI and 3L-NPC VSI based on direct power control for MV grid-connected power applications,"Ph D. dissertation, Faculty of Engineering, University of Mondragon,2007. [4] R. Vargas, P. Cortes, U. Ammann, J. Rodriguez, and J. Pontt, "Predictive control of a three-phase neutral-point-clamped inverter," IEEE Trans.lnd. Electron., vol. 54, no. 5, pp. 2697-2705, Oct. 2012. 5129 THEWS ENC,G_ COLLEGE
  52. 5] H. Young, M. Perez, J. Rodriguez, and H. Abu-Rub, "Assessing finitecontrol-set model predictive control: A comparison with a linear current controller in two- level voltage source inverters," IEEE Ind. Electron. Mag., vol. 8, no. 1, pp. 44—52, Mar. 2014. [6] Y. Zhang, W. Xie, Z. Li, and Y. Zhang, "Low-complexity model predictive power control: Double-vector-based approach," IEEE Trans. Ind. Electron. , vol. 61, no. 11, pp. 5871—5880, Nov. 2014. [7] V. Yaramasu and B. Wu, "Model predictive decoupled active and reactive power control for high-power grid-connected four-level diode-clamped inverters," IEEE Trans. Ind. Electron., vol. 61, no. 7, pp. 3407—3416, Jul. 2014. 5129 THEWS ENC,G_ COLLEGE
  53. 5129 2024 THEWS ENGG_ COLLEGE

Need a Tutor or Coaching Class?

Post an enquiry and get instant responses from qualified and experienced tutors.

Post Requirement

Related PPTs

Upload PPTs

If you have your own PowerPoint Presentations which you think can benefit others, please upload on MyPrivateTutor. For each approved PPT you will get 50 Credit Points and 50 Activity Score which will increase your profile visibility.

Upload Now