mitigating power fluctuations on utility grid created by klystron modulators n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Mitigating power fluctuations on utility grid created by klystron modulators PowerPoint Presentation
Download Presentation
Mitigating power fluctuations on utility grid created by klystron modulators

Loading in 2 Seconds...

play fullscreen
1 / 20

Mitigating power fluctuations on utility grid created by klystron modulators - PowerPoint PPT Presentation


  • 142 Views
  • Uploaded on

Mitigating power fluctuations on utility grid created by klystron modulators. Sklavounou Eleni TE – EPC – FPC. Introduction. Klystron Modulators R&D Objectives: Propose design solution for the modulators charging sub-system minimizing the grid power fluctuation.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Mitigating power fluctuations on utility grid created by klystron modulators' - emerald-mcfadden


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
mitigating power fluctuations on utility grid created by klystron modulators

Mitigating power fluctuations on utility grid created by klystron modulators

Sklavounou Eleni

TE – EPC – FPC

introduction
Introduction
  • Klystron Modulators R&D Objectives:
    • Propose design solution for the modulators charging sub-system minimizing the grid power fluctuation.
    • Design the control strategy of capacitor chargers for minimum power fluctuation.
  • Problematic:

Grid power fluctuation

VS

capacitors voltage droop + current and voltage regulation capabilities of the charger + cost + size

industrial survey for chargers and capacitors 1
Industrial survey for chargers and capacitors [1]
  • Contacted companies for capacitor charger offers: Fug, Technix, Heinzinger.
  • Offers received for constant power consumption from the utility grid:

Aiming for 96% minimum charger efficiency

industrial survey for chargers and capacitors 2
Industrial survey for chargers and capacitors [2]
  • Main capacitor bank:
    • TYPE: Film capacitor.
    • SIZE: Create a model describing volume vs stored energy of a capacitor bank. (Data obtained from: AVX Film Capacitors)

Voltage level was taken into consideration

BUT

finally it is depending on Energy only!

power quality specifications
Power quality specifications
  • Network specifications according to IEC and EDF
  • We don’t have all the specifications yet, however we are creating models which allow us to predict power quality vs different design choices. Once the power quality specs are defined, models can quickly provide hints for design directions!
slide6

Design considerations for power fluctuation mitigation

  • Considering the charger as a constant current source:

Unacceptable power fluctuation!!!

slide7

Ideal case: Imposing Pch=constant

Ideal charging current

Very high bandwidth charger needed

slide8

Real case study: model the capacitor charger as 2nd order transfer function:

*Ideal case: infinite current bandwidth

*Real case study: 2kHz current bandwidth

slide9

First results: Power fluctuation of the charger as a function of its closed loop current bandwidth.

get into the charger topology
Get into the charger topology
  • Internal capacitor bank as a second “filter” to
    • Stabilize the voltage at the input of the DC/DC converter.
    • Provide active power filtering to the grid
  • Which are the compromises between the internal capacitance Cinternal and the DC/DC converter bandwidth?
1 st results for the grid active power
1st results for the grid active power
  • Power fluctuation for different Cint and Bandwidth of the DC/DC converter (transfer function modeling approach)
simplified models for power charging voltage control studies
Simplified models for power & charging voltage control studies
  • DC/DC conversion topology : buck converter (benefit from the linearity between duty cycle and output voltage).
  • We aim to simplify our analyses, especially when considering several systems in parallel.
  • Verify the accuracy of the created models by comparing the output of the transfer function modeling approach with the output of the equivalent power model, considering the same input.
models simplification
Models simplification
  • Power model (time domain)
  • Slow
  • Too complex (depending on topology)
  • For overall power & voltage control strategies - Not interested in design details
  • Transfer function model (frequency domain)
  • Fast
  • Simple
  • Neglecting phenomena at switching frequency level (we are not interested in!)
  • Handful for control analyses

Need to cross-validate the two approaches to verify that simplifications are acceptable.

validation for equivalence between models
Validation for equivalence between models

Equivalence between time domain and frequency domain models

active power closed loop operation problematic vs loading condition changes
Active power closed loop operation problematic vs loading condition changes

Estimated averaged active power

Unexpected load conditions (i.e. main PFS switch timing deviation)

Result???

multi objective control needs
Multi objective control needs
  • …but the charging voltage should be reproducible!
  • We need multi objective control strategies (for power fluctuation & voltage reproducibility).
  • …or one can imagine a correction on the charging current!
  • We are studying methods to derive multi-objective control strategies for finding the optimal compromise between Vch and Pfluct.

For instance

active power measurements experimental results 1
Active power measurements & experimental results [1]
  • Try to implement control strategies in practice with existing charger.
  • The control strategy could be systematically used in EPC capacitor discharge converters to reduce power fluctuations
  • Grid current measurements:
    • Results: Quality of Technix chargers (diode bridge topology, no PFC → insert harmonics in the current → Not suitable for power leveling control implementation).
slide18

Active power measurements & experimental results [2]

  • Measurement of 3phase active power by measuring V and I and implementing Clarke transform
  • Difference between constant charging current values
conclusions future work
Conclusions & Future work
  • Conclusions
    • Power Design: -Survey of commercial solutions – cost, size, regulation capabilities-Correlate charger DC/DC conv. bandwidth with grid power fluctuation and charger size
    • Control Design:Simplified & validated models for power & charging voltage control studies
    • Currently evaluating control strategies
  • Future work
    • Power Design:Review and design of the converters (performances evaluation of different topologies)
    • Control Design:Continue control studies to optimise compromises between active power fluctuation & charging voltage reproducibility
slide20
Ευχαριστώ πολύ

Thank you very much

Merci beaucoup