俞永杰, 邓伟成, 陈堃, 李君, 许建中, 赵成勇. 四端柔性直流电网物理平台研制及实验验证[J]. 高电压技术, 2021, 47(1): 178-186. DOI: 10.13336/j.1003-6520.hve.20200507019
引用本文: 俞永杰, 邓伟成, 陈堃, 李君, 许建中, 赵成勇. 四端柔性直流电网物理平台研制及实验验证[J]. 高电压技术, 2021, 47(1): 178-186. DOI: 10.13336/j.1003-6520.hve.20200507019
YU Yongjie, DENG Weicheng, CHEN Kun, LI Jun, XU Jianzhong, ZHAO Chengyong. Development and Experimental Verification of Four-terminal DC Grid Physical Platform[J]. High Voltage Engineering, 2021, 47(1): 178-186. DOI: 10.13336/j.1003-6520.hve.20200507019
Citation: YU Yongjie, DENG Weicheng, CHEN Kun, LI Jun, XU Jianzhong, ZHAO Chengyong. Development and Experimental Verification of Four-terminal DC Grid Physical Platform[J]. High Voltage Engineering, 2021, 47(1): 178-186. DOI: 10.13336/j.1003-6520.hve.20200507019

四端柔性直流电网物理平台研制及实验验证

Development and Experimental Verification of Four-terminal DC Grid Physical Platform

  • 摘要: 为了开展直流电网故障传播特性和故障清除策略的实验验证研究,依托张北四端直流电网工程研制了四端柔性直流电网物理平台。该平台采用伪双极系统接线形式,各桥臂通过全桥模块化多电平换流器(modular multilevel converter, MMC)子模块进行级联。在控制器架构方面,平台包括上位机、控制机箱、子模块机箱3级控制结构,分别通过以太网和光纤进行通讯,所有控制算法集中编写在控制机箱的现场可编程门阵列(field-programmable gate array, FPGA)中,并且通过FPGA实现桥臂子模块电容电压分组排序的均压策略,以此简化控制架构并提高控制器的响应速度。正常运行、功率阶跃等实验均验证了该物理平台各方面的良好性能,并且通过换流站和直流断路器协同配合的故障清除实验体现了该平台独特优势,说明了其具备开展直流电网故障传播特性和故障清除研究的硬件能力,可为后续研究提供硬件支持。

     

    Abstract: In order to carry out experimental verification on the protection and fault clearance strategy based on DC grid, we develop a four-terminal DC grid physical platform according to the network structure of Zhangbei DC grid. The pseudo-bipolar connection at DC-side is adopted in the platform, and each bridge arm is cascaded through a full-bridge modular multiple converter (MMC) sub-module. In terms of controller structure, the physical platform includes 3-level control structures, such as upper computer, crate controller, and sub-module crate, communicating through the Ethernet and optical fiber, respectively. And all control algorithm is set in FPGA of crate controller, realizing packet sequencing voltage-sharing strategy of the capacitor of sub-modules (SMs) to simplify the control method and improve response speed of controller. The good performance of physical platform is verified by the experiments of normal operation and power step change. Finally, the experiment of fault clearing is carried out.The results show that the physical platform has the hardware ability to carry out the research of DC power grid protection and fault clearing, which can provide good hardware support for the follow-up research.

     

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