应用于直流电网的直接耦合式直流变压器

发布时间：2018-10-15 16:16

【摘要】：多端直流输电和直流电网技术是解决新能源并网的有效技术手段之一,直流变压器是连接不同直流电压,构建直流电网的关键设备。为满足直流电网中对变压器高效率、低成本的需求,提出了一种基于链式模块的直接耦合式直流变压器拓扑,并提出一种阶梯波准两电平调制方法以实现子模块电容电压均衡,同时降低链式模块输出电压的du/dt。该直流变压器与基于正弦波调制的非隔离型直流变压器相比具有以下优点:一个周期内,开关管仅开通和关断一次,开关频率较低;交流环流分量更小,因此直流变压器的导通损耗和开关损耗更小;所需的子模块电容容值显著减小,可有效降低子模块的体积和成本。基于Matlab/Simulink,对所提出的直流变压器进行仿真分析,验证了理论分析的正确性。
[Abstract]:Multi-terminal DC transmission and DC network technology is one of the effective technical means to solve the problem of new energy grid connection. DC transformer is the key equipment to connect different DC voltage and construct DC network. In order to meet the demand of high efficiency and low cost for transformers in DC networks, a direct coupling DC transformer topology based on chain module is proposed, and a step wave quasi-two-level modulation method is proposed to realize capacitor voltage equalization of sub-modules. Du/dt. for reducing output Voltage of chain Module at the same time Compared with the non-isolated DC transformer based on sinusoidal modulation, the DC transformer has the following advantages: in a period, the switch tube is turned on and off only once, the switching frequency is lower, and the AC circulation component is smaller, Therefore, the on-loss and switching loss of DC transformer are smaller, and the capacitance capacity of the submodule is significantly reduced, which can effectively reduce the volume and cost of the sub-module. The simulation analysis of the proposed DC transformer based on Matlab/Simulink, verifies the correctness of the theoretical analysis.
【作者单位】：上海交通大学电子信息与电气工程学院风力发电研究中心;
【基金】：国家自然科学基金项目(51677117) 上海市科学技术委员会科研计划课题(16DZ1203402)~~
【分类号】：TM41

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