Sequential design of controller for parallel dc/dc converters via Gauss-Jordan factorization: Nyquist approach

Conclusion

In this paper the design of a multivariable controller for parallel operating dc/dc converters is presented. The applied design method is the Gauss-Jordan Nyquist sequential procedure. Three differently structured plant models from the literature are subjected to this procedure, each with arbitrary number of paralleled converters.

In each case adequate controller is obtained, its structure discussed and variable parameters tuned. Proximity of resulting controllers with those obtained through decoupling approach is also explained. The simulation analysis revealed excellent closed loop performance, proving that the performance objectives are satisfied.

In all three cases, resulting controllers were designed for plant models based on laboratory ‘buck’ converter prototype described in literature. Nevertheless, arguments used and explanation given make generalization of obtained controllers to any converter type straightforward.