Constrained real-time optimal control for cyclic AC PWM systems

The paper introduces a constrained optimal control approach for cyclic AC PWM systems for which computation of the optimal modulation with respect to some cost criterion is too complex for real-time execution. For such systems it is possible to precompute optimal cyclic steady state solutions for different operating points and create a look-up table for real-time implementation. As the operating point changes, direct application of the corresponding optimal cyclic steady state solution causes adverse effects, such as increased system losses. The proposed optimal control approach allows to reduce these effects by doing fast transitions between precomputed optimal solutions, bringing the system to the new optimal steady state operation within half a cycle. The approach effectiveness is demonstrated on a multisource DC-DC converter benchmark example.