Abstract
In order to improve the charging speed and reduce the occupied volume of an electric vehicle charger, a single-phase boost power factor corrector (PFC) system with cascade CHB (cascaded H-bridge) topology was adopted. Due to the periodic fluctuation of single-phase AC input, there is a large double power frequency ripple component in the output voltage of an AC-DC converter. When capacitor voltage is used as output for feedback control, the control system has the characteristics of a non-minimum phase system. In light of these factors that affect the dynamic stability of the system, a control method is proposed to improve the dynamic characteristics of the system without affecting its steady-state performance. The predictive PI control strategy was adopted to predict the error input signal of the lag process to attenuate the jitter in the control system and improve the dynamic performance and anti-interference of the system. Finally, the feasibility of the scheme was verified by experiments.
Highlights
With the rapid development of the electric vehicle industry, the charging speed and convenience of electric vehicles have been put forward as having higher requirements.Electric vehicle charging can be divided into DC charging and AC charging
The inductor volume depends on the inductor volume and peak current, and the inductor volume is determined by its volt-second [3]
The single-phase AC-DC converter designed in this project adopted cascade structure and carrier phase shift modulation
Summary
With the rapid development of the electric vehicle industry, the charging speed and convenience of electric vehicles have been put forward as having higher requirements. Due to the periodic pulsation of single-phase AC input, the output voltage of the AC-DC converter will inevitably have a large double power frequency ripple component. In the application where the load is often changing rapidly, the circuit response speed is slow, and the interference will lead to the voltage fluctuation of the output DC bus, which will cause additional pressure on the devices in the system This reduces the control performance of the system, and does harm to the load [7,8]. In order to ensure high-quality input current waveform control and effectively improve the dynamic performance of a single-phase AC-DC converter, some scholars have eliminated the ripple component of DC output voltage from the hardware level of the main circuit. The predictive PI control algorithm was proposed to improve the dynamic performance of the single-phase cascade PFC system.
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