Control and implementation of converter based ac transmission line emulation
Control and implementation of converter based ac transmission line emulation
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DOI：
10.1109/apec.2015.7104592
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Bo Liu;Sheng Zheng;Yiwei Ma;Fred Wang;L. Tolbert
中科院分区：
文献类型：
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作者：
Bo Liu;Sheng Zheng;Yiwei Ma;Fred Wang;L. Tolbert
一种超广域传输网络仿真器，也被称为硬件试验台(HTB)，正在开发中，用来使用再生变流器来仿真大规模互联电力系统。交流输电线路仿真器是该系统中连接两个区域电网和研究交流系统在不同场景下行为的关键部件。本文提出了两种基于背靠背电压型换流器(BTB)的交流输电线路仿真通用方法，分别对应于相量域模型和离散时间域模型。提出了两种控制方案，两者对通信速度和数字时延的依赖性较小，从而使高精度和模拟交流线路潮流的动态成为可能。分析了BTB转换器损耗对仿真性能的影响，并提出了相应的解决方案。最后，通过三相比例缩比样机的仿真和实验，验证了交流线路仿真在正常运行和跳闸线路情况下的建模和控制方案。
An ultra-wide-area transmission network emulator, also called hardware test-bed (HTB), is being developed to emulate the large-scale interconnected power systems by using regenerative converters. Ac transmission line emulator is a key component in this system to connect two-area grid and to study the ac system's behavior under different scenarios. In this paper, two generic approaches of emulating the ac transmission line are developed based on back-to-back (BTB) voltage source converters (VSC), corresponding to the phasor domain model and discrete time domain model respectively. Two control schemes are presented, both showing less dependency on the communication speed and digital delay, thus enabling high accuracy and the possibility to emulate the dynamics of ac line flow. The impacts of BTB converter losses on the emulation performance are also analyzed, and the corresponding solution is provided. Finally, simulation and experimental results obtained from a scale-down three-phase prototype well verify the modeling and control scheme of the ac line emulation under normal operation and tripping line scenarios.