基于电网动态等值的PSS参数优化

发布时间：2018-05-16 23:38

本文选题：励磁系统 + 动态等值　；参考：《华中科技大学》2014年硕士论文

【摘要】：励磁系统的动态性能显著影响电力系统的安全稳定运行，，随着电网的互联发展出现了一些新的问题，对励磁系统提出了更加高的要求。因此，为了大电网互联以及建设高水平的电网，有必要对励磁系统参数的优化设计进行更深入的研究。本文主要工作是基于电网动态等值方法对PSS参数优化方法进行了研究。首先分析了现有电网等值方法的特点和不足，针对同步发电机励磁系统参数的优化研究提出了一种新的电网动态等值方法，即将外部电网等值为一台二阶动态机组支路和无穷大机组支路的并联，既可以反映远方大电网的影响，也可以反映近端同母线机组的影响。紧接着采用了穷举法来辨识动态等值模型参数，此方法只通过发电机端口扰动数据即可进行辨识，分别针对PSASP软件的仿真扰动数据和现场实测扰动数据进行了辨识计算，仿真验证了穷举辨识法的有效性。进一步地，为了验证动态等值方法的优越性，基于动态等值模型对PSS参数优化方法进行了研究，首先推导了两机无穷大系统的Philips-Heffron模型，基于此线性模型计算励磁控制系统的无补偿相频特性，然后基于相位补偿法分别采用了穷举法和改进的粒子群算法来优化PSS的时间常数，仿真结果表明优化后的PSS参数有效提高了系统阻尼比，从而验证了优化算法的有效性。最后分别基于静态等值方法和动态等值方法对PSS参数进行优化，仿真验证了动态等值方法的有效性。
[Abstract]:The dynamic performance of the excitation system has a significant impact on the safe and stable operation of the power system. With the development of the power grid, some new problems have emerged, which put forward higher requirements for the excitation system. Therefore, it is necessary to study the optimal design of excitation system parameters in order to connect large power grid and build high level power grid. The main work of this paper is to study the optimization method of PSS parameters based on the power grid dynamic equivalence method. Firstly, the characteristics and shortcomings of the existing power grid equivalence methods are analyzed, and a new power grid dynamic equivalence method is proposed for the optimization of excitation system parameters of synchronous generators. In other words, the external power grid is equivalent to the parallel connection between a branch of a second-order dynamic unit and a branch of an infinite unit, which can not only reflect the influence of the remote power grid, but also reflect the influence of the near end of the same bus unit. Then the exhaustive method is used to identify the dynamic equivalent model parameters, which can be identified only by the generator port disturbance data. The simulation disturbance data of PSASP software and the field measured disturbance data are identified and calculated respectively. Simulation results show the effectiveness of the exhaustive identification method. Furthermore, in order to verify the superiority of the dynamic equivalence method, the optimization method of PSS parameters is studied based on the dynamic equivalent model. Firstly, the Philips-Heffron model of the two-machine infinite bus system is derived. Based on this linear model, the phase frequency characteristics of excitation control system without compensation are calculated, and then the exhaustive method and the improved particle swarm optimization algorithm are used to optimize the time constant of PSS based on the phase compensation method. The simulation results show that the optimized PSS parameters can effectively improve the damping ratio of the system and verify the effectiveness of the optimization algorithm. Finally, the PSS parameters are optimized based on the static equivalence method and the dynamic equivalence method, respectively, and the simulation results show that the dynamic equivalence method is effective.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732

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