Global Optimal Solving Algorithm for Power Distribution Based on Selective Harmonic Elimination in Cascaded H-Bridge...

Area of Science:

• Electrical Engineering
• Power Electronics
• Control Systems

Background:

• Conventional power distribution methods suffer from high switching frequencies, multiple carrier cycles, and limited distribution capabilities.
• These challenges hinder efficient and flexible power management in modern systems.

Purpose of the Study:

• To introduce a novel power distribution strategy based on selective harmonic elimination (PD-SHE).
• To achieve arbitrary power distribution and selective harmonic elimination with reduced switching frequency and a single carrier cycle.

Main Methods:

• Developed a PD-SHE model integrating selective harmonic elimination (SHE) principles and power calculation theory.
• Introduced a distribution ratio for arbitrary power adjustment and deduced its constraints.
• Addressed solution redundancy by incorporating valid constraints.
• Employed the polynomial homotopy continuation (PHC) algorithm to solve the PD-SHE model globally.

Main Results:

• The PD-SHE strategy enables arbitrary power distribution and selective harmonic elimination.
• The PHC algorithm efficiently finds all physically realizable solutions across the full modulation index range without initial value dependency.
• Simulations and physical experiments confirmed the strategy's effectiveness, harmonic elimination accuracy, and active power distribution reliability.

Conclusions:

• The proposed PD-SHE strategy effectively addresses limitations of conventional power distribution methods.
• The PHC algorithm provides a robust and globally optimal solution for the PD-SHE model.
• The validated strategy offers a superior approach for advanced power management applications.