摘要
在双极性直流微电网中,正负极母线之间存在电压不平衡的问题。为平衡正负极母线电压和提升母线的功率输出性能,文中提出一种适用于双极性直流母线的新型双输入三电平半桥DC-DC变换器。通过分析变换器的工作原理,在双重移相控制的基础上建立输出功率、电压传输比与回流功率的数学模型,并提出最小回流功率追踪控制方法,降低变换器的损耗。根据双极性直流微电网的特性,在最小回流功率追踪控制的基础上进行切换电压传输比的改进,以一定程度上解决正负极母线电压不平衡的问题,并且进一步降低变换器的回流功率,有效地提升变换器的工作性能。最后利用Matlab/Simulink仿真模拟并分析不同工况下变换器的工作状态,验证文中所提出的双输入三电平半桥DC-DC变换器及其回流功率优化控制方法的有效性与优越性。
In the bipolar DC microgrid,there is a problem of voltage imbalance between the positive and negative bus bars.A new dual-input three-level half-bridge DC-DC converter suitable for bipolar DC busbars is proposed to balance the voltage of the positive and negative busbars and improve the power output performance of the busbars. By analyzing the working principle of the converter,a mathematical model of output power,voltage transfer ratio and return power is established based on dual phase-shifting control,and a minimum return power tracking control method is proposed to reduce the loss of the converter.According to the characteristics of the bipolar DC microgrid,the switching voltage transmission ratio is improved on the basis of the tracking control of the minimum return power,which solves the problem of voltage imbalance between the positive and negative bus bars to a certain extent,and can further reduce the return power of the converter,effectively improve the working performance of the converter. The working states of the converter under different working conditions are simulated and analyzed by Matlab/Simulink,which verifies the effectiveness and superiority of the dual-input three-level half-bridge DC-DC converter and its return power optimization control method proposed in this paper.
作者
李江荣
杨向宇
LI Jiangrong;YANG Xiangyu(School of Electric Power Engineering,South China University of Technology,Guangzhou 510000,China)
出处
《现代电子技术》
2022年第10期99-104,共6页
Modern Electronics Technique
基金
广东省自然科学基金项目(2016A030313464)
广东省科技计划项目(2019B090910001)。
