本文選題：測(cè)控裝置　切入點(diǎn)：10kV線(xiàn)路　出處：《安徽理工大學(xué)》2017年碩士論文

【摘要】：10kV配電線(xiàn)路為電力系統(tǒng)中分布最廣的部分,其主要任務(wù)是對(duì)電能進(jìn)行合理分配,但線(xiàn)路的負(fù)荷隨時(shí)都在變化,線(xiàn)路的各類(lèi)故障,無(wú)論是自然的還是人為的也隨時(shí)可能發(fā)生。及時(shí)準(zhǔn)確地了解線(xiàn)路的運(yùn)行狀態(tài)以及進(jìn)一步的決策至關(guān)重要。而保護(hù)測(cè)控裝置負(fù)責(zé)采集各種數(shù)據(jù),并將采集的數(shù)據(jù)上送主機(jī),同時(shí)也接受主機(jī)發(fā)來(lái)的控制命令,并執(zhí)行相應(yīng)的操作。因此,對(duì)10kV配電線(xiàn)路保護(hù)測(cè)控裝置的研究具有重要的現(xiàn)實(shí)意義。本文首先介紹線(xiàn)路測(cè)控裝置的保護(hù)原理,接著分析保護(hù)測(cè)控裝置的濾波算法。配電線(xiàn)路發(fā)生故障后的暫態(tài)過(guò)程中,故障電壓、電流含有豐富的暫態(tài)噪聲,所以保護(hù)測(cè)控裝置中必須采用濾波算法濾除這些噪聲。在眾多濾波算法中,傅里葉算法以其良好的性能和相對(duì)簡(jiǎn)便的算法,在線(xiàn)路保護(hù)中獲得廣泛的應(yīng)用。但傅里葉算法只能濾除直流分量和整次諧波分量,不能濾除衰減直流分量。因此對(duì)傅里葉算法進(jìn)行改進(jìn),其基本原理是對(duì)衰減直流分量的正弦、余弦分量的系數(shù)進(jìn)行補(bǔ)償,來(lái)消除衰減直流分量對(duì)傅里葉算法的影響。仿真結(jié)果表明改進(jìn)的傅里葉算法濾除衰減直流分量的效果更好。其次,設(shè)計(jì)了 10kV線(xiàn)路測(cè)控裝置的硬件電路。依據(jù)模塊化的設(shè)計(jì)思想將其分為CPU電路、開(kāi)關(guān)量輸入與輸出電路、信息傳送電路等主要電路模塊。在CPU里運(yùn)用了 TMS320F28335DSP芯片作為其核心部件,主要對(duì)其相關(guān)的邏輯及功能進(jìn)行有效的控制。信息傳送部分運(yùn)用RS485接口電路為控制芯片來(lái)實(shí)現(xiàn)人機(jī)界面、通訊等功能。電源模塊采用TI公司的雙電源芯片TPS767D301,并通過(guò)開(kāi)關(guān)電源電路為其各個(gè)部分提供所需的直流電源。最后,給出了保護(hù)測(cè)控裝置的軟件模塊,在CCS的開(kāi)發(fā)環(huán)境下實(shí)現(xiàn)主程序設(shè)計(jì),及相關(guān)子程序的設(shè)計(jì),來(lái)確保保護(hù)測(cè)控裝置能正常的動(dòng)作,提高保護(hù)的穩(wěn)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.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM75;TM773

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本文編號(hào)：1688061