福建电网南埔机组PSS运行异常现象分析研究
发布时间：2018-08-04 15:14
【摘要】：电力系统稳定器(PSS)是一种附加励磁控制装置,实践表明在机组装设电力系统稳定器是抑制低频振荡、提高电力系统动态稳定性最为经济有效的措施。近年来,福建省内各电厂机组PSS的试验、投运积累了一定实践经验,大多数电厂PSS的运用对提高我省电力系统的动态稳定性起到了积极的作用。随着运用的深入,也出现了省内个别机组在某些时刻投入PSS时,有功波动增大的异常现象。针对该异常现象开展研究,以找出其发生原因,进而来取有效措施解决问题,有较大的工程实际意义。本文介绍了电力系统低频振荡的相关理论、概念和分析方法,对电力系统稳定器(PSS)抑制低频振荡的工作原理和常用PSS模型进行了分析,特别针对南埔电厂机组2A型PSS模型、参数的实现原理进行了详尽的分析；采用现场试验的方法,从系统振荡源、励磁系统软硬件问题、AVR及PSS参数问题、调速器与PSS间相互作用四个方面对南埔电厂2号机组功率波动问题进行逐一排查,基本明确了机组功率异常波动的原因是由于2号机PSS输出存在异常引起的,为理论分析提供实测数据支持。对Prony数字信号分析方法的优点、算法、参数设置等进行了重点介绍,采用Prony分析方法,从信号分析的角度,对现场实际录波曲线和实测数据进行全面的频谱分析与振荡特性研究,探究功率异常波动出现的原因。依据南埔电厂各动态元件实测模型参数,基于Matlab/Simulink仿真环境,建立南埔电厂机组励磁系统、调速器系统、PSS以及发电机模型,在此基础之上,综合研究不同PSS参数的设置对发电机组有功功率波动的影响,对比仿真结果与实际录波曲线之间的差异,研究PSS各硬件部分对机组功率异常输出的影响,分析PSS各环节硬件是否存在故障。本文针对福建电网南埔机组PSS运行后首次出现的功率异常波动现象,采用现场试验排查、现场实测数据Prony分析、Matlab仿真验证等手段展开研究,对异常现象的产生原因提出了理论上的解释,并通过调整PSS参数、励磁调节器更换抗干扰能力强的板卡等措施,有效解决了异常现象,为未来同类型机组出现PSS异常现象分析研究提供借鉴。
[Abstract]:Power system stabilizer (PSS) is an additional excitation control device. Practice shows that installing power system stabilizer is the most economical and effective measure to restrain low frequency oscillation and improve dynamic stability of power system. In recent years, the PSS test of power plants in Fujian Province has accumulated some practical experience. The application of PSS in most power plants has played a positive role in improving the dynamic stability of power system in our province. With the deepening of application, there is an abnormal phenomenon that the active power fluctuation increases when some units in the province are put into PSS at some time. It is of great practical significance to study the abnormal phenomenon in order to find out the causes and take effective measures to solve the problem. This paper introduces the theory, concept and analysis method of low frequency oscillation in power system, analyzes the working principle and common PSS model of power system stabilizer (PSS) to suppress low frequency oscillation, especially for the model of type 2A PSS in Nanpu Power Plant. The realization principle of the parameters is analyzed in detail, and the problems of AVR and PSS parameters are discussed from the system oscillation source, the excitation system software and hardware problems, and the method of field test. The power fluctuation of No. 2 unit in Nanpu Power Plant is investigated one by one from four aspects of the interaction between governor and PSS. It is basically clear that the cause of abnormal power fluctuation of unit 2 is caused by the abnormal output of PSS of Unit 2. To provide theoretical analysis with measured data support. The advantages, algorithms, parameters setting of Prony digital signal analysis method are introduced in detail. The Prony analysis method is used to analyze the signal. The spectrum analysis and oscillation characteristics of actual recorded and measured data are studied to find out the cause of abnormal power fluctuation. Based on the measured model parameters of various dynamic components in Nanpu Power Plant and the simulation environment of Matlab/Simulink, the excitation system, governor system and generator model of Nanpu Power Plant are established. The influence of different PSS parameters on the active power fluctuation of generating set is studied synthetically. The difference between the simulation result and the actual recorded wave curve is compared, and the influence of different hardware parts of PSS on the abnormal output of unit power is studied. This paper analyzes whether the hardware of PSS is faulty or not. In this paper, based on the phenomenon of abnormal power fluctuation of Nanpu generating unit in Fujian power grid after its first operation, the field test and investigation, Prony analysis of field measurement data and Matlab simulation verification are used to carry out the research. The causes of abnormal phenomena are explained in theory, and the abnormal phenomena are effectively solved by adjusting the PSS parameters and replacing the board cards with strong anti-interference ability of the excitation regulator. It provides a reference for the analysis and research of PSS anomaly in the future of the same type units.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712
本文编号：2164279
[Abstract]:Power system stabilizer (PSS) is an additional excitation control device. Practice shows that installing power system stabilizer is the most economical and effective measure to restrain low frequency oscillation and improve dynamic stability of power system. In recent years, the PSS test of power plants in Fujian Province has accumulated some practical experience. The application of PSS in most power plants has played a positive role in improving the dynamic stability of power system in our province. With the deepening of application, there is an abnormal phenomenon that the active power fluctuation increases when some units in the province are put into PSS at some time. It is of great practical significance to study the abnormal phenomenon in order to find out the causes and take effective measures to solve the problem. This paper introduces the theory, concept and analysis method of low frequency oscillation in power system, analyzes the working principle and common PSS model of power system stabilizer (PSS) to suppress low frequency oscillation, especially for the model of type 2A PSS in Nanpu Power Plant. The realization principle of the parameters is analyzed in detail, and the problems of AVR and PSS parameters are discussed from the system oscillation source, the excitation system software and hardware problems, and the method of field test. The power fluctuation of No. 2 unit in Nanpu Power Plant is investigated one by one from four aspects of the interaction between governor and PSS. It is basically clear that the cause of abnormal power fluctuation of unit 2 is caused by the abnormal output of PSS of Unit 2. To provide theoretical analysis with measured data support. The advantages, algorithms, parameters setting of Prony digital signal analysis method are introduced in detail. The Prony analysis method is used to analyze the signal. The spectrum analysis and oscillation characteristics of actual recorded and measured data are studied to find out the cause of abnormal power fluctuation. Based on the measured model parameters of various dynamic components in Nanpu Power Plant and the simulation environment of Matlab/Simulink, the excitation system, governor system and generator model of Nanpu Power Plant are established. The influence of different PSS parameters on the active power fluctuation of generating set is studied synthetically. The difference between the simulation result and the actual recorded wave curve is compared, and the influence of different hardware parts of PSS on the abnormal output of unit power is studied. This paper analyzes whether the hardware of PSS is faulty or not. In this paper, based on the phenomenon of abnormal power fluctuation of Nanpu generating unit in Fujian power grid after its first operation, the field test and investigation, Prony analysis of field measurement data and Matlab simulation verification are used to carry out the research. The causes of abnormal phenomena are explained in theory, and the abnormal phenomena are effectively solved by adjusting the PSS parameters and replacing the board cards with strong anti-interference ability of the excitation regulator. It provides a reference for the analysis and research of PSS anomaly in the future of the same type units.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712
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