Events at Department of Energy Technology

Industrial/PhD Course: Generators and their control



01.11.2021 kl. 08.30 - 03.11.2021 kl. 16.00



Prof. F. Blaabjerg, Aalborg University, Denmark 


Prof. Ion Boldea, Politehnica University of Timisoara, Romania 
Prof. F. Blaabjerg, Aalborg University, Denmark 

ECTS:  3  


Fractional KVA ratings PWM Converter variable wind(hydro) generators de sign and control: recent progress 

Motivation and brief Contents description: Fractional KVA(MVA) ratings PWM converter  variable speed generators represent 50 % of all installed wind power by DFIG systems which underwent staggering progress in optimal design and advanced control in strong and weak  Grid and standalone applications, with asymmetric voltage sags etc. But in an effort to eliminate the slip-rings and brush system to transmit power from DFIG rotor to fractional KVA(MVA) ratings(30-40%)PWM  Converter, quite a few BRUSHLESS solutions have been developed spectacularly in the last decade: like BDFIG,BDFRG, Dual stator winding cage CRIG, open winding CRIG, dual rotor dual stator winding flux modulation PM brushless generators which also enjoy the Fractional KVA ratings PWM converter in the control stator winding while the power stator winding is connected to the grid or , in a standalone mode, to a diode rectifier. 

The main scope of these solutions is initial and maintenance cost reduction with still high efficiency for limited(+-30%) speed variation range in wind(hydro) energy conversion but also in standalone applications with ac or dc controlled output(say as  marine vessel, or aircraft starter-generators with gas turbine or Diesel engine prime movers etc applications. 

All the above issues are treated in detail based on IEEE representative seminal and recent lit. and our own research results to endow the participants with solid knowledge for designing and controlling BRUSHLESS  variable speed generators with fractional KVA(MVA) ratings PWM converters of the  Future. 

  • Day 1:  (3+2=5 hours) Recent Progress in variable speed DFIG design and control for Grid applications:  

  • Day 2: (2+3=5hours) 

  1. Stand-alone variable speed DFIG with control dc output and constant and variable stator  frequency control (2 hours) 
  2. Brushless DFI(R)Gs design and advanced control recent progress (3 hours) 
  • Day 3: (2+2+1=5 hours) 

  1. Brushless dual stator winding(DSW) variable speed CRIG with fractional KVA PWM converter and dc (or dc+ ac)controlled output  (2hours) 
  2. Brushless Dual rotor DSW PM high efficiency high torque density   variable speed generators (2 hours)  
  3. Recap dialogue…(1 hour) 


basic electrical machinery, power electronics and control knowledge  

Form of evaluation: 

The participants will be given upon course commencing (via :D.O.I.  IEEE number) a recent (2020)representative IEEE Trans. on PEL paper related to the subjects but adjacent(different)in Contents: to assess with improvements proposals in an one page Report(on paper) delivered on the end of Day 2 for the Lecturers to appraise; and discuss in the last hour in the 3rd day in the Recap-Dialogue time. 

Slides presentation with in between Q&As will be used for the lectures. All throughout  


6000 DKK for PhD students outside of Denmark and 8000 DKK for the Industry.


AAU Energy

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