Improved Analytical Model for the Study of Steady State Performance of Droop-Controlled VSC-MTDC Systems
Improved Analytical Model for the Study of Steady State Performance of Droop-Controlled VSC-MTDC Systems
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DOI：
10.1109/tpwrs.2016.2601104
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发表时间：
2017-05
影响因子：
6.6
通讯作者：
Liang Xiao;Zheng Xu;T. An;Z. Bian
中科院分区：
文献类型：
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作者：
Liang Xiao;Zheng Xu;T. An;Z. Bian
本文提出了一种改进的分析模型，用于研究下垂控制VSC-MTDC系统的稳态性能。当功率扰动发生时，如功率设置的正常变化和换流器故障，下垂控制换流器的功率可能会达到极限，因此此类换流器不再有助于功率共享，这在分析功率扰动对多端HVDC（MTDC）系统性能的影响时应特别注意。基于二分法和叠加原理，该分析模型提供了一种简单的方法来估计的结果的功率分布，直流电压偏差，和功率损耗的MTDC系统考虑换流器停运和换流器过载的变化。对一个改进的新英格兰39节点系统进行了仿真，验证了所提出的分析模型。
This paper proposes an improved analytical model for the study of steady-state performance of droop-controlled VSC-MTDC systems. When power disturbances occur, such as those imposed by normal changes in power settings and converter outages, the powers of the converters with droop control may hit their limits and hence such converters no longer contribute to power sharing, which should be paid special attention when analyzing the impacts of power disturbances on the performance of multi-terminal HVDC (MTDC) systems. Based on the bisection algorithm and superposition principle, the proposed analytical model provides an easy way to estimate the results of power distributions, dc voltage deviations, and power loss variations of the MTDC system taking converter outage and converter overload into account. Simulations of a modified New England 39-bus system incorporating a four-terminal MTDC system are carried out for validating the proposed analytical model.