UPFC阻尼转矩分析和PSS分布式设计在大规模电网中的应用研究

发布时间：2018-10-20 13:29

【摘要】：论文以我国某省实际电网为研究背景,旨在提高该省网的动态稳定性和运行安全性,抑制系统低频振荡的发生。论文主要从两个方向进行了研究。首先,在FACTS设备上附加阻尼控制器。由于该省电网新加装了一台UPFC,UPFC具有强大的潮流和电压等控制功能,控制通道数较多,因此可在其控制通道上附加阻尼控制器,向系统提供阻尼。本论文在MATLAB软件环境下,独立编写了一套适用于多机系统中UPFC阻尼转矩分析的程序,利用阻尼转矩分析方法研究了阻尼控制器附加在UPFC不同控制通道上时向目标模式提供阻尼的情况,包括阻尼在各台机组之间传递分配的过程,各台机组参与模式振荡的程度。最后选出了阻尼控制器的最佳安装通道,即控制交流电压V的通道,并将结果与模式分析法进行了对比验证,证明了其正确性。此外,论文通过在发电机组上加装电力系统稳定器来提高系统阻尼,并提出了设计稳定器的一种新方法,即稳定器的分布式设计方法。该方法以发电机出口升压变压器高压侧母线电压角度为相位参考点建立本地模型,不需要求解计算发电厂以外的系统参数,只要采集本地的信号即可,因此其设计简单方便,并适合在大规模电网中的应用,本论文首先在MATLAB软件环境下,以单机无穷大母线系统为例,利用分布式原理设计了电力系统稳定器,并进行了仿真验证,证明了该方法的有效性。随后针对该省电网2016年夏季高峰运行方式,在PSD-BPA电力系统分析软件环境下,计算了网络中存在的5个低频振荡模式,并用分布式设计方法设计了稳定器。最后,在频域内对比了稳定器加装前后振荡模式的阻尼比变化情况,同时在时域内进行了仿真,对比了稳定器加装前后系统振荡的幅度。无论频域还是时域内的结果都表明了分布式方法设计的稳定器提高了该省网的动态稳定性,适于在大规模电网中的应用设计。
[Abstract]:The purpose of this paper is to improve the dynamic stability and operation security of the power grid in a province of China, and to restrain the occurrence of the low frequency oscillation of the system. This paper mainly studies from two directions. First, a damping controller is attached to the FACTS device. Because a new UPFC,UPFC has powerful control functions such as power flow and voltage and there are more control channels in the power grid of this province, damping controller can be added to the control channel to provide damping to the system. In this paper, an independent program for UPFC damping torque analysis in multi-machine systems is developed under the environment of MATLAB software. The damping torque analysis method is used to study the damping supply to the target mode when the damping controller is attached to different control channels of the UPFC, including the transfer and distribution of damping among the units, and the degree of participation of each unit in the mode oscillation. Finally, the optimal installation channel of the damping controller is selected, that is, the channel to control the AC voltage V, and the results are compared with the mode analysis method, and the correctness of the method is proved. In addition, the system damping is improved by installing power system stabilizer on the generator set, and a new method of designing stabilizer, I. E. the distributed design method of stabilizer, is proposed. This method takes the voltage angle of high-voltage bus of generator outlet booster transformer as the phase reference point to establish the local model. It does not need to solve the calculation of system parameters outside the power plant, so it can only collect local signals, so its design is simple and convenient. And it is suitable for application in large-scale power network. Firstly, in the environment of MATLAB software, the power system stabilizer is designed based on the distributed principle, and the simulation is carried out with the single machine infinite bus system as an example. The effectiveness of the method is proved. Then, in view of the peak operation mode of the provincial power grid in 2016 summer, five low frequency oscillation modes in the network are calculated under the environment of PSD-BPA power system analysis software, and the stabilizer is designed with the distributed design method. Finally, the damping ratio of the stabilizer before and after the addition of the stabilizer is compared in the frequency domain. At the same time, the simulation in time domain is carried out, and the amplitude of the oscillation before and after the installation of the stabilizer is compared. The results in both frequency domain and time domain show that the stabilizer designed by the distributed method improves the dynamic stability of the power network and is suitable for application in large-scale power systems.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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