Collaborative Emergency Control Strategy Providing Transient Stability After HVDC-link Blocking

2022 IEEE 6th Conference on Energy Internet and Energy System Integration (EI2) Pub Date : 2022-11-11 DOI:10.1109/EI256261.2022.10117100

Jiawei Hu, H. Nee, Tong Wang, Zengping Wang

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Abstract

Continuous commutation failures of line-commutated high-voltage direct current converter caused by AC faults lead to the blocking of HVDC-link. This may seriously threaten the stability of post-fault power system. Therefore, a collaborative emergency control strategy making use of DC power support is presented to guarantee transient stability after HVDC-link blocking. Firstly, the control enabling criterion is defined based on the variation characteristics of the phase trajectory slope during the first swing, while the analytical equation between the needed control quantity and the system parameters is derived. Secondly, the mathematical relation between the provided control quantity and the number of HVDC-links participating in the power support is deduced, and the participation sequence is determined on the basis of the post-fault stable equilibrium points. Additionally, the time delay of the whole implementation is considered. Finally, the effectiveness of presented control strategy is validated using the improved IEEE 68-bus AC/DC hybrid power system.

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提供高压直流链路阻塞后暂态稳定性的协同应急控制策略

线路换流高压直流变换器由于交流故障导致连续换流失效，导致高压直流链路阻塞。这将严重威胁到故障后电力系统的稳定性。为此，提出了一种利用直流电源支持的协同应急控制策略，以保证直流链路阻塞后的暂态稳定。首先，根据相位轨迹斜率在第一次摆动时的变化特征，定义了控制使能准则，推导了所需控制量与系统参数之间的解析方程;其次，推导了提供的控制量与参与电力支持的hvdc链路数之间的数学关系，并根据故障后稳定平衡点确定了参与顺序;此外，还考虑了整个实现过程的时间延迟。最后，利用改进的IEEE 68总线交直流混合电源系统验证了所提控制策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE 6th Conference on Energy Internet and Energy System Integration (EI2)

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