In bipolar DC distribution systems, voltage balancers play a crucial role in maintaining pole voltage balance. Instead of employing dedicated balancer circuits, which add extra switches and passive components. Modern approaches integrate the voltage balancing function directly into existing converter structures, which enables the converter to perform both power processing and voltage balancing simultaneously, offering a compact, cost-effective, and multifunctional solution for bipolar DC lines. This work presents an optimized PWM scheme for the Integrated Three Port Converter (ITPC) that minimizes system losses while maintaining stable converter operation. The proposed scheme effectively balances pole voltages without sacrificing regulation accuracy or power transfer capability. The concept is validated through detailed simulation and experimental hardware results, showing approximately 15-20 % reduction in total losses and about 3-5 % improvement in overall efficiency compared to conventional modulation methods. The proposed PWM scheme provides a practical solution for high-efficiency operation of ITPC interfaced to bipolar DC distribution systems.
