基于爬山法的双Boost双向DC/DC效率优化研究

Optimization of Dual Boost Bidirectional DC/DC Efficiency Based on Hill Climbing Algorithm

在满足输出电压条件下,基于脉宽调制(PWM)与移相控制策略结合的隔离型双向DC/DC变换器存在多个移相角和占空比的组合,但是变换器在不同移相角和占空比组合下的传输效率并不相同。为了提高基于PWM与移相控制策略方法隔离型双向DC/DC变换器的传输效率,提出一种基于爬山算法的效率优化方法。所提方法将不同移相角和占空比的组合作为算法的解,传输效率作为评价函数。基于初始条件下,用爬山法对移相角和占空比进行校正,以获得变换器最大的传输效率,该方法能快速找到变换器全局最优解。最后,实验验证了通过爬山算法实现双向DC/DC变换器获得最大效率的可行性。

For an isolated bidirectional DC/DC converter controlled by pulse width modulation(PWM)and phase shift strategy,there exists various combinations of phase shift angles and duty cycles that can meet the requirement of the output voltage.However,the efficiency of the power converter is different under various combinations of phase shift angles and duty cycles.In order to find a suitable combination,an efficiency optimization method based on hill climbing algorithm is proposed.Different combinations of phase shift angles and duty cycles are used as the solution of the algorithm,and the efficiency is treated as the evaluation function.Based on the initial conditions,the hill climbing algorithm can quickly correct the phase shift angles and duty cycles to obtain the maximum efficiency of the power converter.Finally,the experimental results validate the feasibility of the proposed method.