Optimal stabilization of constant power loads with input LC-filters

• A linear model for structured analysis of power control performance is derived.
• Fundamental performance limitations for active stabilization are derived.
• Optimal feedback and feedforward control for active stabilization is derived.
• It is demonstrated that torque and voltage reference stabilization are equivalent.

This contribution examines fundamental performance limitations of active stabilization of constant power loads with input LC filters. In terms of the load input admittance, stabilization is posed as a linear H∞ optimization problem, where the influence of stabilization on power control performance is minimized while meeting stability and robustness constraints. It is shown that the bandwidth of power control is upper limited by the resonance frequency of the input filter and that additional feedforward controllers can be used to individually shape reference tracking and disturbance rejection. Optimal results are verified through simulations using two different stabilization schemes.

Figure optionsDownload as PowerPoint slide