Fast bus voltage detection method for single-phase power converters with split capacitors based on reduced-order generalized integrals

Under dynamic conditions, the response time of traditional voltage detection methods is relatively lengthy, leading to overshoots in the DC-link voltage of single-phase power converters, which significantly degrades system performance. This study proposes a rapid voltage transient detection method based on reduced-order generalized integrator (ROGI) aimed at improving the response speed of bus voltage peak detection. By reducing the order of the algorithm, this method shortens the generation time of orthogonal signals and accelerates the detection speed of voltage changes. This enables grid power to rapidly compensate for the load power under dynamic conditions while maintaining a high-precision complementarity of the split capacitor voltage. As a result, it effectively diminishes severe fluctuations in DC-link voltage, which increases the stability of the system under dynamic load changes. This paper meticulously derives the relationship between capacitor voltage changes and grid response delays, and constructs the ROGI algorithm and its control scheme, ensuring the robustness of the method in the presence of system parameter variations. Finally, to validate the effectiveness of the proposed method, a hardware experimental platform is established and tested. Results of load step response experiments indicate that the ROGI algorithm, in comparison to traditional detection methods, reduces the detection time by 40.9%.