摘要
双有源全桥(dual active bridge,DAB)变换器能够适应直流供电系统中诸多应用场合的需求,受到了广泛关注。准确而直观的DAB变换器等值电路模型对多电压等级的直流配电网潮流分析和计算具有重要的意义。为兼具含DAB变换器的多电压等级直流配电网潮流计算的准确性和直观性,考虑元件寄生参数的影响,建立了单移相比调制方式下DAB变换器支路π型等值电路模型,分析了DAB变换器在直流配电网潮流计算中的功率传输路径和潮流调节的基本原理;计及典型直流负荷的特点和DAB的不同控制方式,提出基于二分搜索法的改进牛顿-拉夫逊直流潮流计算方法。最后,利用6节点直流配电网验证了所提模型的功率传输路径理论的正确性,并基于此模型利用修改的IEEE14节点直流配电网算例,验证所提含DAB变换器多电压等级直流配电网潮流计算模型和方法的有效性和正确性。
Dual Active Bridge(DAB) converters have been widely used to meet the needs of many applications in DC power supply systems. An accurate and intuitive DAB converter equivalent circuit model is of great significance for multi-voltage grades DC distribution power flow calculation and analysis. In order to achieve the accuracy and intuitiveness of the power flow calculation of the multi-voltage grades DC distribution network with DAB converter, a π-type equivalent circuit of DAB converter branch under single-shift compared with modulation mode is established considering the influence of component parasitic parameters. The model analyzes the power transmission path and the basic principle of power flow regulation in DAB power flow calculation of the DC distribution network. Considering the characteristics of the typical DC load and different control methods,an improved Newton-Raphson power flow calculation method based on binary search method is proposed. Finally, the correctness of the power transmission path theory of the proposed model is verified by a 6-node DC distribution network. Based on this model, the validity and correctness of power flow calculation in the multi-grade voltage DC distribution network with DAB converter is verified by a modified IEEE 14-node DC distribution network.
作者
刘朋
贾燕冰
韩肖清
LIU Peng;JIA Yanbing;HAN Xiaoqing(Shanxi Key Laboratory of Power System Operation and Control,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2021年第2期741-750,共10页
Power System Technology
基金
国家重点研发计划项目(2018YFB0904700)
山西省重点研发计划项目(国际科技合作)(201803D421010)。
关键词
双有源全桥变换器
多电压等级直流配电网
潮流计算
支路等效模型
二分搜索法
dual active bridge converter
multi-voltage grades DC distribution network
power flow calculation
branch equivalent model
binary search
