基于DC/DC变换器的柔性直流输电数学建模仿真  

Mathematical Modeling and Simulation of Flexible DC Transmission Based on DC/DC Converter

作　　者：梁义 马建成 LIANG Yi;MA Jian-cheng(North China Electric Power University(BaoDing),Hebei Baoding 071051,China)

机构地区：[1]华北电力大学(保定),河北保定071051

出　　处：《计算机仿真》2021年第4期78-82,共5页Computer Simulation

基　　金：河北省高等教育教学改革研究与实践项目(223519002);河北省高等教育教学改革研究与实践项目(223518007)。

摘　　要：为缓解高质量电压对直流输电线路造成的抑制影响,充分增强柔性直流输电网络的可靠性与灵活性,建立基于DC/DC变换器的柔性直流输电数学应用模型。通过DC/DC变换器控制的方式,选择与变换器结构体相关的拓扑连接行为,再利用高频变压器原副边匝数比数值,实现基于DC/DC变换器的直流输电特性分析。设置MMC基本控制器,采取内外环控制同步实施的方法,完成输电网络环境中的三次谐波调制,实现基于DC/DC变换器的柔性直流输电数学应用模型的顺利应用。仿真结果表明,应用所提方法的柔性直流输电网络中的电压传输量、电流传输量均出现明显增大的变化趋势,输出功率稳定,可有效缓解高质量电压对直流输电线路造成的抑制性影响。An application model of flexible DC transmission was constructed based on a DC/DC converter for alleviating the suppression of high-quality voltage on DC transmission lines and improving the reliability and flexibility of the flexible DC transmission network.First, according to the control mode of the DC/DC converter, the topology connection behavior related to the converter structure was selected. Then, based on the ratio of primary and secondary side turns of the high-frequency transformer, the analysis of DC transmission characteristics based on the DC/DC converter was achieved. Second, the MMC basic controller was set, and the inner and outer loop control was carried out simultaneously to complete the third harmonic modulation in the transmission network environment. Finally, the application of the mathematical model of flexible HVDC based on the DC/DC converter was completed.The simulation results show that the method has high voltage and current transmission capacity, stable output power, effectively alleviating the suppression of high-quality voltage on HVDC transmission lines.

关 键 词：变换器 直流输电 高频变压器 原副边匝数比 控制器 三次谐波 

分 类 号：TN452[电子电信—微电子学与固体电子学]