Enhancement of voltage quality in a passive network supplied by a VSC-HVDC transmission under disturbances
Enhancement of voltage quality in a passive network supplied by a VSC-HVDC transmission under disturbances
复制标题
提高由 VSC-HVDC 传输在干扰下供电的无源网络中的电压质量
DOI：
10.1016/j.ijepes.2013.06.030
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发表时间：
2014
影响因子：
5.2
通讯作者：
Lu, Dylan Dah-Chuan
中科院分区：
文献类型：
--
作者：
Tang, Xin;Lu, Dylan Dah-Chuan
当VSC-HVDC输电连接到无源网络时，接收交流系统较弱，并且容易出现电压暂降和暂升等电能质量问题。电压控制的动态性能将直接影响受端交流系统的电压质量。直接电压控制（DVC）方法虽然简单，但无法快速消除负载电流变化引起的电压波动。一种解决方案是向 DVC 添加前馈控制器。然而，逆变器的非线性会降低前馈控制器的性能。本文提出了一种改进的直流电压控制，通过克服逆变器非线性的影响来增强接收交流系统的控制动态。在所提出的控制方案中，首先讨论了逆变器非线性对前馈控制器性能的影响。然后设计了d-q旋转轴上逆变器非线性的补偿方法。此外，为了克服前馈控制器的参数敏感性，采用了带有 PI 控制器的反馈环路。 PSCAD/EMTDC仿真结果表明，与传统控制方法相比，采用所提出的控制方案的VSC-HVDC系统具有更好的抑制系统扰动期间电压波动的能力。
When a VSC-HVDC transmission is connected to a passive network, the receiving AC system is weak and is subject to power quality problems such as voltage sag and swell. Dynamic performance of voltage control would affect the voltage quality in the receiving AC system directly. The direct voltage control (DVC) method is simple but fails to quickly eliminate voltage fluctuation caused by load current change. One solution is to add a feed-forward controller to the DVC. The inverter nonlinearities, however, degrade the performance of the feed-forward controller. This paper presents a modified direct voltage control to enhance control dynamics in the receiving AC system by overcoming the effect of inverter nonlinearities. In the proposed control scheme, the influence of inverter nonlinearities on the performance of the feed-forward controller is first discussed. A compensation method for nonlinearities of the inverter is then designed in thed–qrotating axis. Moreover, to overcome parameter sensitivity of the feed-forward controller, a feed-back loop with a PI controller is implemented. Simulation results from PSCAD/EMTDC showed that the VSC-HVDC system using the proposed control scheme, as compared to that with the conventional control methods, has a better capability to mitigate voltage fluctuation during system disturbances.
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影响因子：
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作者：
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DOI：
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发表时间：
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DOI：
10.1049/ip-c:19840002
发表时间：
1984
期刊：
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影响因子：
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