Abstract
The four-switch Buck-Boost (FSBB) converter can produce voltage conversion within a wide input voltage range, which is suitable for variable-speed permanent magnet synchronous generator (PMSG) energy storage systems with AC inputs and DC outputs. To reduce the interference of input voltage fluctuation on the performance of the FSBB converter, an input voltage feedforward (IVFF) compensation method is proposed in this paper. The switching synchronization strategy is simple. Using the switching average model, the small signal model of a non-ideal FSBB converter in all working modes is established. The effects of input voltage, load current, damping coefficient and right half plane (RHP) zero on the stability of the control system are analyzed in detail. The transfer function of the IVFF of the FSBB converter is derived, and the relationship between input voltage, load current and duty cycle is analyzed. Finally, the design of the parameters of the converter control system is presented. The simulation and experimental results show that this FSBB converter has high efficiency and a good transient response.
Highlights
As independent power supplies, generator energy storage systems are widely used in automobile, communication and other engineering fields
The permanent magnet synchronous generator (PMSG) works at a variable speed and it is driven by a drag device
The AC voltage output by the PMSG is converted into a pulsating DC voltage by a rectifier circuit, and the pulsating voltage is converted into a constant voltage by a DC-DC converter [6,7,8]
Summary
Generator energy storage systems are widely used in automobile, communication and other engineering fields. The singleswitch Buck-Boost output voltage has an opposite polarity It can be used in highpower circuits, it poses the problems of high switching stress and complex control [9,10]. In the variable-speed PMSG energy storage system, the AC voltage range of the generator output is wide, and the output voltage of the uncontrolled rectifier fluctuates greatly. The wide-range fluctuation of the input voltage changes the operating point of the FSBB converter control system, and even leads to its instability. A wide-input voltage range FSBB converter control method suitable for variablespeed PMSG is proposed. To reduce the influence of variable-speed PMSG output voltage disturbance on the FSBB converter, an IVFF method with synchronous operating modes is proposed. The analysis, design and performance are verified by a prototype
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