Binary Search Based Flexible Power Control for Single-Stage Multiport Inverter-Fed Motor Drives

A single-stage multiport inverter (SSMPI)-fed motor drive, which connects dc-side energy sources to the ac motor without the application of any dc/dc power converters, offers a lightweight and highly-efficient multiple-source integration option for hybrid electric vehicles. However, the existing flexible power control strategies of SSMPI require adjusting more control parameters and suffering from low control precision. To tackle these issues, first, an equivalent two-level model-based space vector modulation strategy is adopted to accomplish the synthesis of the expected voltage vector, and power distribution between dc-port sources may also be realized simultaneously through regulating the two redundant zero vectors' duration times. Then, different from prior control schemes, the power distribution control problem is transformed into the problem of solving nonlinear equations and a binary search algorithm is utilized to solve them. Based on this, the two redundant zero vectors' duration times are calculated for realizing an anticipant power distribution. The proposed method features fewer control parameter adjustments and improves power control performance with simplified implementation. Finally, the expected output power control performance of the proposed approach are verified via several steady-state comparative experiments on a permanent-magnet synchronous motor (PMSM) in the laboratory corroborate.