基于实测系统扰动的同步发电机参数辨识与验证  

Identification and Validation for Synchronous Generator Parameters Based on Recorded On-Line Disturbance Data

作　　者：伍双喜[1] 张伯明[1] 吴文传[1] 孙宏斌[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《电网技术》2012年第11期87-93,共7页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB217904);国家电网公司科技项目(20092001510)~~

摘　　要：为提高发电机参数的有效性,提出了一种基于实测系统扰动数据的同步发电机参数辨识与验证方法。首先,根据扰动前后不同参数的特性被激发程度不同的特点,对发电机参数进行分步辨识,即利用稳态量测辨识稳态参数,利用扰动量测辨识暂态/次暂态参数。进一步根据发电机功角可测时d、q轴的解耦特性,对d轴、q轴的暂态/次暂态参数进行解耦辨识。利用分步、解耦的辨识策略进行参数辨识,每一步待辨识的参数不超过4个,从而提高辨识结果的鲁棒性。然后,提出一种基于外部时序受控源的混合动态仿真验证策略,实现发电机参数的灵敏验证。最后,利用某实际电网的实测扰动数据对实际发电机的参数进行了辨识和验证,结果证实了上述方法的有效性。To improve the validity of parameters,a parameter identification and validation method is proposed for synchronous generator using recorded disturbance data. Compared with traditional off-line testing,this process can be done while the units are on-line.Robustness can＇t be guaranteed when all parameters are identified together. Therefore,a step-by-step identification algorithm for synchronous generator is proposed.Firstly,steady parameters are calculated from steady measurements directly.Then transient and subtransient parameters are estimated from disturbance data.What＇s more,transient parameters can be divided into two groups,named d-axis group and q-axis group, and each group of parameters can be estimated separately due to the decoupling characteristics of d-q axis when power angle measurement is available.At most four parameters are estimated at each step and therefore robustness of identification results can be improved.Identification results may be polluted for some reasons,such as identifiability of parameters or bad data exists in measurements.A parameter validation strategy for synchronous generator is proposed based on external sequence controlled source,which can validate parameters sensitively.The paper presents the successful applications of this technique to actual fault scenarios.Test results of the case studies demonstrate the validity of the proposed method.

关 键 词：参数辨识 模型校核 电力系统 混合动态仿真 

分 类 号：TM712[电气工程—电力系统及自动化]