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A Novel Controller for Electric Springs Based on Bode Diagram Optimization

  • Wang, Qingsong ;
  • Cheng, Ming ;
  • Jiang, Yunlei
  • Received : 2015.06.04
  • Accepted : 2016.02.12
  • Published : 2016.07.20

Abstract

A novel controller design is presented for the recently proposed electric springs (ESs). The dynamic modeling is analyzed first, and the initial Bode diagram is derived from the s-domain transfer function in the open loop. The design objective is set according to the characteristics of a minimum phase system. Step-by-step optimizations of the Bode diagram are provided to illustrate the proposed controller, the design of which is different from the classical multistage leading/lagging design. The final controller is the accumulation of the transfer function at each step. With the controller and the recently proposed δ control, the critical load voltage can be regulated to follow the desired waveform precisely while the fluctuations and distortions of the input voltage are passed to the non-critical loads. Frequency responses at any point can be modified in the Bode diagram. The results of the modeling and controller design are validated via simulations. Hardware and software designs are provided. A digital phase locked loop is realized with the platform of a digital signal processor. The effectiveness of the proposed control is also validated by experimental results.

Keywords

Bode diagram;Controller design;Electric spring;Minimum phase system;Modeling;Phase control;Renewable energy systems

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