MODELING AND CONTROL OF POWER CONVERTERS FOR ENERGY STORAGE INTERFACE ON A MICROGRID
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Power DC-to-DC converters are critical to AC and DC microgrids. Among the DC-to-DC power converters, the boost converter has a right half plane zero, which makes it difficult to control. The load voltage must be kept constant, no matter the variations in the input voltage or the change of the load; to achieve this, a negative feedback loop and a control strategy are necessary. This research presents five different digital control strategies to regulate the output of a non-ideal DC-DC boost converter, operating either in continuous conduction mode (CCM) or discontinuous conduction mode (DCM). Four of them are innovative control strategies, implemented by modifying regular K-factor and regular voltage mode control. The fifth is current mode, which is widely used as the industrial standard. A simple algorithm to set up the parameters for each compensator was introduced. In an ideal system, these control strategies performed well, but when time delays were added the performance of the controllers changed significantly, and the stability of the system could be affected. The closed-loop performance of all controllers was evaluated and compared. Simulation results are provided to show the effectiveness of each controller and compare their performance. A laboratory experiment and parametric sweep measurements were made to validate the boost converter small-signal model.
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