Grid Connected Converter Mohammed Abu Radhi Sayaf Almari Fahad - - PowerPoint PPT Presentation

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Grid Connected Converter Mohammed Abu Radhi Sayaf Almari Fahad - - PowerPoint PPT Presentation

Apr 28, 2023 110 likes •312 views

Grid Connected Converter Mohammed Abu Radhi Sayaf Almari Fahad Alghareeb Di Miao Kaiqiong Ji Project Mentor: Ashwija Reddy Korenda 1 1f Client Dr.Venkata Yaramasu Assistant Professor at NAU Director of AMPERE Lab School of Informatics,

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SLIDE 1

Grid Connected Converter

Mohammed Abu Radhi Sayaf Almari Fahad Alghareeb Di Miao Kaiqiong Ji Project Mentor:

Ashwija Reddy Korenda

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SLIDE 2

Client

Dr.Venkata Yaramasu Assistant Professor at NAU Director of AMPERE Lab School of Informatics, Computing, and Cyber Systems Research Interests Research interests include renewable energy, high power converters, variable-speed drives, electric vehicles, power quality, smart grid, and model predictive control. Education PhD, Electrical Engineering, Ryerson University, Toronto, Canada ME, Electrical Engineering, S.G.S. Institute of Technology and Science, India B.Tech, Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, India

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2 Fahad

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SLIDE 3

Introduction

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[1-2]

  • Power conversion systems consists of two main parts:

A- converter. (GCC)

  • Connected to the utility grid and to the power supply.
  • Converts the input (AC/DC) to AC with specific frequency and

voltage phase that matches the current flowing in the utility grid. B- controlling unit. (PCC)

  • A control unit is the brain of the converter.
  • Regulate the current output so it matches the reference current

(utility grid current).

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SLIDE 4

Problem Definition

Client’s Research Focus: A- Wind Power Systems. B- Photovoltaic Systems. C- Motor Drives. Problem

  • There is no laboratory scale prototype converters available in

the market that fits all of these applications.

  • Needs plug and play converter to fit the three power

conversion applications.

  • Having such converter will help our client to develop new

power converter topologies and test new controlling schemes such as model predictive control. Goal

  • Implement and build a prototype of multilevel converter for

high power applications and test it using model predictive control.

  • Practical power level is at 5 MW.
  • Prototype power level is at 5 kW.

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[3]

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SLIDE 5

Client Needs & Constraints

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  • A functional prototype power converter fits three different power applications.
  • Improving simulation models for the predictive current control topology, and test it.
  • Constraints include improving efficiency, reliability, size, and simplicity of multilevel converters.
  • Dr. Yaramasu emphasized on keeping the design simple and use surface mounted electrical components.
  • Writing and publishing an IEEE paper.
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SLIDE 6

Solution: a Back-to-Back NPC Converter

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NPC Converter Schematic Features:

  • Fitting photovoltaic, wind turbine, and motor drives

power systems.

  • Ability to improve efficiency, and reduce harmonic

distortion through improved versions of simulation models.

  • Small size of IGPT’s

[4] A- Motor Drives. AC (fixed v,f) => DC => AC (variable v,f) B-Wind Power Systems. AC (variable v,f) => DC => AC (fixed v,f) C- Photovoltaic Systems. DC => AC (fixed v,f)

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SLIDE 7

Hardware Implementation

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Stage 1: Designing PCB’s Stage 2: Before soldering Stage 3: After soldering

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SLIDE 8

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Overall Design

Gate Drivers : Provides electrical isolation , turn on/off switching devices

NPC Power Board:contains IGPT

converting to AC

dSPACE Interface Board: Convert TTL logic signals from the dSPACE DS1103-based to CMOS logic Voltage sensors: send

voltage measurements to the control unit

Current sensors :send current

measurements to the control unit

Heatsink: cool down power board

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SLIDE 9

Simulation & Testing

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  • 1. Grid connected 2L-VSC with PCC 2. Grid connected NPC with PCC

Implement the stationary frame predictive current control (PCC)

  • lower switching frequency
  • Does not require any kind of linear controller or modulation technique

The complete simulation model of Grid connected 2L- VSC with PCC scheme The complete simulation model of Grid connected NPC with PCC scheme

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SLIDE 10

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PCC for NPC with grid

8 Switching states 27 Switching states By changing codes in S- function 2L-VSC NPC converter Advantages:

  • more efficiency
  • more adjustable
  • faster dynamic response

S-function

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SLIDE 11

Predictive Current Control(PCC)

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Model of PCC (Stationary frame) Measurements

Stationary current Stationary current & Reference current Repeating Sequence

The algorithm is based on a model of the system. From that model, the behavior of the system is predicted for each possible switching state of the inverter.

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SLIDE 12

1.Grid connected NPC with PCC

Results & Analysis

Stationary Current R Reference current AC to DC It is used to generate reference current 12 Di Miao

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SLIDE 13

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Results & Analysis

Vg Ig_ab Ig_ab & Ig_ab(reference) Zooming Repeating Sequence

  • 2. Grid connected 2L-VSC with PCC (Same waveform with Grid connected NPC)
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SLIDE 14

Results & Analysis

Simulation Actual Results

  • Successful conversion of a 3500 watt to

AC that can be fed to the utility grid.

  • 1. The converter was supplied with 350 V and

10 Amp DC power.

  • 2. Three phase AC waveforms.
  • 3. 5 level line to line AC waveform

14 Di Miao

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SLIDE 15

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Issues

Noise problem: Phase E disfunctionality: Solutions: Problem:

  • The postive half of phase E is not working

in the inverter side of the converter.

  • Still working on the problem.
  • An IGPT might be replaced.

Sayaf

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SLIDE 16

Rectifier Demo

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Results Demo Video

  • Three phase AC waveforms.
  • 5 level line to line AC waveform.
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SLIDE 17

Conclusion

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  • The NPC power converter has met our client major requirements, and

will be delivered to Dr.Yaramasu by the end of Spring2018 semester.

  • Team is still trying to solve the disfunctional phase, and hopefully

we will have it working before deadline.

  • Simulaion files are all completed, and improved.
  • The new converter has a smaller size, weight , and more simple

compared to the last year Capsone design.

  • Also, the team is writing an IEEE paper, and it will be delivered to

Dr.Yaramasu as required.

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SLIDE 18

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References

[1]"Multi with grid connected converter for solar and/or wind turbine", Victronenergy.com, 2017. [Online]. Available: https://www.victronenergy.com/upload/documents/multi-with-grid-connected-converter- for-solar-and-or-wind-turbine.pdf. [Accessed: 06- Nov- 2017]. [2] "Solenoids and Actuators", Homepages.which.net, 2017. [Online]. Available: http://homepages.which.net/~paul.hills/Solenoids/SolenoidsBody.html. [Accessed: 06- Nov- 2017]. [3] Ukconstructionmedia.co.uk. (2018). £557M funding for new renewable energy projects - UK Construction Online. [online] Available at: https://www.ukconstructionmedia.co.uk/news/557m-funding-new- renewable-energy-projects/ [Accessed 17 Apr. 2018]. [4] Wang, Yingjie, et al. "A novel neutral-point potential balance strategy for three-level NPC back-to-back converter based on the neutral-point current injection model." Mathematical Problems in Engineering,

  • 2015. Academic OneFile, Accessed 17 Apr. 2018.
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SLIDE 19

Questions?

Thank You

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