基于回流功率优化的双重移相控制研究

Dual Phase Shift Control Based on Backflow Power Optimization

为了抑制传统单移相控制下隔离型双向全桥DC-DC变换器回流功率较大、开关管应力较大、传输效率较低等问题,提出一种基于双重移相控制下直接功率优化策略。首先,建立传统单移相与双重移相两种控制模式下功率传输的数学模型,针对不同传输功率、电压调节比,通过直接功率控制来求出最优移相角组合形式。然后,在相同传输功率的条件下建立两种控制策略功率传输和回流功率曲线图,对比分析双重移相优化控制相较于传统单移相在传输效率的优越性,且当变换器传输功率越大,优化效果越明显。最后,仿真和分析结果验证了该控制策略的有效性。相较于传统单移相控制而言,该方法不仅可以降低回流功率、减小开关管电流应力,还可以有效提高变换器的传输效率。

To restrain the problems of high backflow power,high switch stress and low transmission efficiency of isolated bidirectional full-bridge DC-DC converter under traditional single-phase-shift control,a direct power optimization strategy based on dual-phase-shift control is proposed.Firstly,this paper establishes the mathematical model of power transmission under the traditional single-phase and double-phase control modes,and finds the optimal combination of phase-shifting angles by direct power control for different transmission power and voltage regulation ratios.Then,based on the same transmission power,the power transmission and backflow power curves of the two control strategies are established..Compared with the traditional single-phase control,the optimal control of double-phase-shifting has more advantages in transmission efficiency,and the more power the converter transmits,the more obvious the optimization effect is.Finally,the simulation and analysis results verify the effectiveness of the control strategy.Compared with the traditional single-phase control,this method can not only reduce the backflow power and the current stress of the switch,but also effectively improve the transmission efficiency of the converter.