引用本文: | 盛逸标,林涛,陈汝斯,等.滚动优化PSS参数搜索小干扰稳定极限边界策略研究[J].电力系统保护与控制,2018,46(17):47-53.[点击复制] |
SHENG Yibiao,LIN Tao,CHEN Rusi,et al.Research on rolling optimization of PSS parameters to search for small signal stability boundary strategy[J].Power System Protection and Control,2018,46(17):47-53[点击复制] |
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摘要: |
当前电力系统具有大区域间弱互联并伴随同步发电机快速高放大倍数励磁系统大量使用等特征,低频振荡问题多发。小干扰稳定域表征了参数空间中所有能够保持系统小扰动稳定性的平衡点的集合,对于电网的安全稳定运行有重要意义。但现有对小干扰稳定域边界的研究总体处于不计及阻尼控制器参数影响或仅考虑固定阻尼控制器参数的影响的状态,稳定域边界趋于保守。为拓展稳定域边界,以常用的PSS为对象,试图通过优化PSS参数达到拓展边界的目的,对电网规划以及运行方式校核等离线分析提供了一定参考,进一步提高了电网运行的安全性和经济性。为此,首先基于系统平衡点建立了以最小阻尼比最大化为目标的多PSS参数协调优化模型,并采用了改进的PGSA优化算法进行求解。在此基础上,形成了一种基于滚动优化的思路,通过逐步外拓来实现小干扰稳定极限边界点搜索策略。最后,基于4机2区算例,通过与常规方法的对比,验证了所提策略拓展稳定域边界的有效性和优越性。 |
关键词: 低频振荡 电力系统稳定器 改进模拟植物生长优化算法 滚动优化 极限边界 |
DOI:10.7667/PSPC171298 |
投稿时间:2017-08-30修订日期:2017-10-17 |
基金项目:国家重点研发计划项目资助(2017YFB0902600, 2017YFB0902604);国家电网公司总部科技项目“基于安全域的电网安全稳定评估及辅助决策技术研究” |
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Research on rolling optimization of PSS parameters to search for small signal stability boundary strategy |
SHENG Yibiao,LIN Tao,CHEN Rusi,CHEN Baoping,XU Xialing |
(School of Electrical Engineering, Wuhan University, Wuhan 430072, China;Central China Electric Power Dispatching and Communication Center, Wuhan 430077, China) |
Abstract: |
Because power system exists the weak interconnection among large areas and the fast excitation system with high magnification is widely used, low-frequency oscillation is easy to happen. The small signal stability region represents the set of equilibrium points that can maintain the small signal stability of the system in the parameter space, which is important for the safe and stable operation of the power grid. However, the existing research on the boundary of small signal stability region is short of taking the influence of damping controller parameters into account so that the boundary tends to be conservative. In order to extend the stability region boundary and improve the security and economy of operation, which is valuable to the off-line analysis of power system planning and operation mode checking, this paper takes PSS as research objects and establishes a multi-PSS parameter coordination and optimization model with maximum damping ratio. And an improved PGSA optimization algorithm is used to solve the problem. On this basis, this paper proposes a searching strategy of the small signal stability extreme boundary points by rolling optimization of controllers’ parameters. Finally, based on the 4-machine-2-area benchmark, the validity and superiority of the proposed strategy are verified by comparing with the conventional method. This work is supported by National Key Research and Development Program of China (No. 2017YFB0902600 and 2017YFB0902604). |
Key words: low-frequency oscillations power system stabilizer improved PGSA rolling optimization extreme boundary |