10kV配电线路保护测控装置的研究

发布时间：2018-03-30 23:10

本文选题：测控装置　切入点：10kV线路　出处：《安徽理工大学》2017年硕士论文

【摘要】：10kV配电线路为电力系统中分布最广的部分,其主要任务是对电能进行合理分配,但线路的负荷随时都在变化,线路的各类故障,无论是自然的还是人为的也随时可能发生。及时准确地了解线路的运行状态以及进一步的决策至关重要。而保护测控装置负责采集各种数据,并将采集的数据上送主机,同时也接受主机发来的控制命令,并执行相应的操作。因此,对10kV配电线路保护测控装置的研究具有重要的现实意义。本文首先介绍线路测控装置的保护原理,接着分析保护测控装置的滤波算法。配电线路发生故障后的暂态过程中,故障电压、电流含有丰富的暂态噪声,所以保护测控装置中必须采用滤波算法滤除这些噪声。在众多滤波算法中,傅里叶算法以其良好的性能和相对简便的算法,在线路保护中获得广泛的应用。但傅里叶算法只能滤除直流分量和整次谐波分量,不能滤除衰减直流分量。因此对傅里叶算法进行改进,其基本原理是对衰减直流分量的正弦、余弦分量的系数进行补偿,来消除衰减直流分量对傅里叶算法的影响。仿真结果表明改进的傅里叶算法滤除衰减直流分量的效果更好。其次,设计了 10kV线路测控装置的硬件电路。依据模块化的设计思想将其分为CPU电路、开关量输入与输出电路、信息传送电路等主要电路模块。在CPU里运用了 TMS320F28335DSP芯片作为其核心部件,主要对其相关的逻辑及功能进行有效的控制。信息传送部分运用RS485接口电路为控制芯片来实现人机界面、通讯等功能。电源模块采用TI公司的双电源芯片TPS767D301,并通过开关电源电路为其各个部分提供所需的直流电源。最后,给出了保护测控装置的软件模块,在CCS的开发环境下实现主程序设计,及相关子程序的设计,来确保保护测控装置能正常的动作,提高保护的稳定性。
[Abstract]:10kV distribution line is the most widely distributed part in the power system. Its main task is to distribute the electric energy reasonably, but the load of the line is changing at any time. Whether it is natural or man-made, it can happen at any time. It is important to know the running state of the line and make further decision in time and accurately. The protective measurement and control device is responsible for collecting all kinds of data and sending the collected data to the host. At the same time, it also accepts the control command from the host and performs the corresponding operation. Therefore, it is of great practical significance to study the measurement and control device of 10kV distribution line protection. Firstly, this paper introduces the protection principle of the line measurement and control device. Then, the filtering algorithm of protection measurement and control device is analyzed. In the transient process of distribution line fault, the fault voltage and current contain abundant transient noise. Therefore, the filter algorithm must be used to filter the noise in the protective measurement and control device. Among the many filtering algorithms, the Fourier algorithm has good performance and relatively simple algorithm. The Fourier algorithm is widely used in line protection, but the Fourier algorithm can only filter the DC component and the whole harmonic component, but not the attenuated DC component. Therefore, the basic principle of the improved Fourier algorithm is the sinusoidal attenuation of the DC component. The coefficient of the cosine component is compensated to eliminate the influence of the attenuated DC component on the Fourier algorithm. The simulation results show that the improved Fourier algorithm can filter the attenuated DC component better. The hardware circuit of 10kV line measuring and controlling device is designed, which is divided into CPU circuit, switch input circuit and output circuit according to modularization design idea. Information transfer circuit and other main circuit modules. In CPU, the TMS320F28335DSP chip is used as its core component. The information transfer part uses the RS485 interface circuit as the control chip to realize the man-machine interface. Communication and other functions. The power module uses TI's dual power chip TPS767D301, and through the switching power supply circuit to provide its various parts of the DC power supply. Finally, the software module of the protective measurement and control device is given. In the development environment of CCS, the main program design and related subroutine design are implemented to ensure the normal operation of the protection measurement and control device and to improve the stability of the protection.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM773

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