Predictive Control of Active Front End Rectifiers

Research Area: Renewable energy conversion systems (wind & photovoltaic) Predictive Control of Active Front End Rectifiers
Status: Finished  
Jefe de proyecto: Collaborators:
Proposed start date: 2009-09-01 Proposed end date: 2011-08-30

The continuous and accelerated growing of electrical generators based on renewable energy sources will extend the energy matrix in a near future. In this scenario, the electrical grid must include distributed generation as important part of the total energy generation. In order to connect a renewable energy source to the electrical grid, several requirements must be fulfilled. Control of the active and reactive power flow, reduced harmonic injection, control of resonances in high order filters, synchronization to the electric grid and stable generation under grid perturbations are some of those requirements. Power electronics converters provide the interconnection between the distributed generators and the electrical grid that accomplishes all these requirements. Different power topologies and control schemes have been used to cover the mentioned aspects. Among the proposed control methods used in power converters, model predictive control provides a new, flexible and efficient alternative. In effect, predictive control used in power electronics has the following attractive characteristics:

  • Concepts are very intuitive and easy to understand.
  • It can be applied to a great variety of systems.
  • The applicability to multivariable systems becomes straightforward.
  • Deadtimes can be compensated
  • Easy inclusion of non-linearities in the model
  • Simple treatment of contrains
  • The resulting controller is easy to implement
  • This methodology is open to include modifications and extension depending on the specific applications

Accordingly, the contribution of this work is to investigate and implement predictive control techniques to connect power converter directly to the electrical grid satisfying the grid connection requirements. A theoretical study and experimental validation will carry out. Additionally, the performance of the grid connected converter will be studied.


  • Analysis and implementation of predictive direct power control of AFE rectifiers
  • Study of dynamics and resonances mitigation involved on grid connected converters with high order
  • input filters, typically used in grid connected applications.
  • Analysis of predictive control strategies to reduce resonances of the high order input filter.
  • Study of predictive control strategies for grid connected converters with embedded dc-link control.
  • Modeling and simulation of the proposed control strategies
  • Prototype design and implementation of grid connected converters and predictive control.
  • Experimental validation
  • Study on performance, reliability and efficiency.


The methodology to carry out the proposed work includes theoretical studies, simulation, design and implementation of prototype converters, experimental validation and finally, the publication of the results

Expected Outcome

Fulfilling the proposed objectives and goals will generate new knowledge related to methods and procedures to the connection of renewable energy sources into the electrical grid minimizing and the use of power electronics converters to improve the efficiency and reliability of a distributed generation system. The theoretical study and simulation will allow to understand the control techniques currently used to provide an optimal interconnection and developed predictive control methods to further improve its features. The experimental results and validation are expected to confirm the proposed hypothesis about the applicability and performance of predictive control. Finally, the publication of the obtained results on international conferences and journals should confirm the recognition of the research community about the importance of this topic.

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