Abstract
A bidirectional integrated bus voltage conditioner (IBVC) for an isolated phase-shifted full bridge (PSFB) dc/dc converter is proposed to reduce the dc bus voltage oscillations in a cascaded power converter system, where a load converter is controlled tightly with high-control bandwidth. In the proposed method, unlike conventional dc bus voltage stabilization methods for which auxiliary switches are used, the multiplexing utilization of the full bridge switches at the primary side of a PSFB is adopted. In this paper, to improve the dc bus voltage stability, an equivalent virtual resistor is implemented by applying the duty cycle regulation for both legs of the PSFB. The effectiveness of the proposed method on the dc voltage stabilization is examined through simulations and experiments. The achieved results reveal that the dc bus voltage stability is significantly improved with the proposed method.
Highlights
The DC distribution systems developed based on cascaded and interconnected power converters have been widely used in various engineering systems such as renewable energy systems, more-electric aircrafts, and ship electric propulsion systems
The tight control of the load converter with high control bandwidth makes the system to behave like a constant power load (CPL)
SIMPLIFIED SMALL SIGNAL MODEL In order to investigate the influence of the resistive load on the DC bus voltage stability, the simplified model of the circuit presented in Fig. 1 with an additional parallel resistor Rv on DC bus is shown in Fig. 3
Summary
The DC distribution systems developed based on cascaded and interconnected power converters have been widely used in various engineering systems such as renewable energy systems, more-electric aircrafts, and ship electric propulsion systems. An integrated bus voltage conditioner is proposed to stabilize the DC link voltage through multiplexed utilization of the existing full bridge switches, a relatively small capacitor, and an inductor. SIMPLIFIED SMALL SIGNAL MODEL In order to investigate the influence of the resistive load on the DC bus voltage stability, the simplified model of the circuit presented in Fig. 1 with an additional parallel resistor Rv on DC bus is shown in Fig. 3 (assuming the DC bus voltage, udc in Fig. 1 can be rectified by a three-phase diode rectifier as adopted in [6]) In this figure, uds represents an ideal DC power source, Rdc and Ldc are the equivalent output resistance and the inductor of the DC power source converter. According to the Routh’s stability criterion, to stabilize the DC bus voltage, the following condition given by (12) must be satisfied
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