ETA-based analysis of small signal stability considering WADC with multiple time delays

Yibiao Sheng, Tao Lin, Rusi Chen, Baoping Chen, Guili Ding, Xialing Xu, Lin Liu
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Abstract

Low frequency oscillation occurs frequently in power systems. Wide-area damping controller (WADC) based on Wide-Area Measurement System (WAMS) can effectively suppress inter-area low frequency oscillations. However, with the introduction of global signals, time delays are inevitable. Electromagnetic torque analysis method(ETA) can establish the analytic relation between electromagnetic torque coefficients and control parameters of power component, which is facilitative to analyze small signal stability. Considering that WADC has inherent characteristics of multiple time delays, based on the ETA for equivalent two-machine system, this paper deduces the general mathematics expression among electromagnetic torque coefficients, WADC parameters and time delays. The influence mechanism of time delay on electromagnetic torque coefficients and small signal stability is further analyzed. Based on these analysis, performance of damping control of WADC can be improved, on one hand, time-delay small signal stability region is established under fixed WADC parameters, on the other hand, if small signal stability is not achieved under the given WADC parameters due to set of the time delays, optimization scheme is proposed to carry out parameters coordination according to the measured time delays. Finally, taking two time delays as an example, the paper verifies the effectiveness of the proposed method by comparing the system dynamic performance considering two time delays with the system only considering single time delay and the system without time delay in a two-area four-machine power system.
基于eta的多时延WADC小信号稳定性分析
电力系统中经常发生低频振荡。基于广域测量系统(WAMS)的广域阻尼控制器(WADC)能有效抑制区域间低频振荡。然而,随着全局信号的引入,时间延迟是不可避免的。电磁转矩分析方法(ETA)可以建立电磁转矩系数与功率元件控制参数之间的解析关系,便于对小信号稳定性进行分析。考虑到WADC具有多时延的固有特性,本文基于等效双机系统的ETA,推导出电磁转矩系数、WADC参数和时延之间的一般数学表达式。进一步分析了时滞对电磁转矩系数和小信号稳定性的影响机理。基于这些分析,可以提高WADC的阻尼控制性能,一方面,在固定的WADC参数下建立时延小信号稳定区域,另一方面,如果在给定的WADC参数下,由于时间延迟的设置而不能实现小信号稳定,则提出优化方案,根据测量到的时间延迟进行参数协调。最后,以两个时滞为例,通过对比两区四机电力系统中考虑两个时滞、只考虑单个时滞和不考虑时滞的系统动态性能,验证了所提方法的有效性。
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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