本文選題：風(fēng)機(jī)主控系統(tǒng) + 可編程控制器��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：作為風(fēng)能資源利用最有效的方式,風(fēng)電已成為我國(guó)可持續(xù)發(fā)展和經(jīng)濟(jì)增長(zhǎng)的重要組成部分�？删幊炭刂破�(PLC)作為風(fēng)力發(fā)電系統(tǒng)的核心部件,需適應(yīng)復(fù)雜的工作環(huán)境,且風(fēng)機(jī)控制系統(tǒng)對(duì)PLC的穩(wěn)定性和可靠性要求更高。在工業(yè)控制中,通常用電磁兼容性能優(yōu)良來(lái)衡量PLC系統(tǒng)的穩(wěn)定可靠性是否滿足要求。本文結(jié)合“風(fēng)機(jī)主控PLC系統(tǒng)國(guó)產(chǎn)化”項(xiàng)目,針對(duì)國(guó)產(chǎn)化PLC系統(tǒng)在風(fēng)機(jī)試運(yùn)行階段出現(xiàn)的各種EMI干擾問(wèn)題,提高國(guó)產(chǎn)化PLC系統(tǒng)的電磁兼容性能迫在眉睫。本文在電磁兼容理論分析的基礎(chǔ)上,提出了一整套針對(duì)國(guó)產(chǎn)化PLC電磁兼容問(wèn)題的解決方案,并將這套方案成功的融入到國(guó)產(chǎn)化PLC設(shè)計(jì)流程中。在綜合分析現(xiàn)有電磁兼容設(shè)計(jì)技術(shù)的前提下,吸取其中有利于提高國(guó)產(chǎn)化PLC電磁兼容可靠性的設(shè)計(jì)方案,利用仿真工具對(duì)設(shè)計(jì)方案進(jìn)行分析;最后,通過(guò)工程儀器對(duì)整套國(guó)產(chǎn)化PLC系統(tǒng)進(jìn)行電磁兼容可靠性驗(yàn)證。本文主要完成的工作有:(1)PLC電磁兼容技術(shù)研究難點(diǎn)與關(guān)鍵技術(shù)。結(jié)合國(guó)內(nèi)外PLC電磁兼容現(xiàn)狀,分析了PLC進(jìn)行電磁兼容設(shè)計(jì)存在的問(wèn)題;本文分析了風(fēng)力發(fā)電控制器機(jī)組中的干擾源和干擾信號(hào),包括其傳播途徑和耦合方式,將干擾方式分解為弱磁場(chǎng)耦合和弱電場(chǎng)耦合,建立各自的二端口電路模型計(jì)算干擾電壓和電流。對(duì)常用的電磁兼容技術(shù)包括屏蔽、濾波、接地、隔離等技術(shù)特點(diǎn)進(jìn)行分析,提出適合于本文的電磁兼容設(shè)計(jì)拓?fù)浣Y(jié)構(gòu);(2)電磁兼容原理圖設(shè)計(jì)和仿真實(shí)現(xiàn)。對(duì)國(guó)產(chǎn)化PLC系統(tǒng)的通信端口包括以太網(wǎng)端口、CAN端口、總線適配器端口、電源端口、數(shù)字、模擬傳感器信號(hào)端口進(jìn)行電磁兼容原理圖設(shè)計(jì)。使用Altium Designer軟件對(duì)PCB板進(jìn)行電磁兼容設(shè)計(jì)和仿真驗(yàn)證。文中分析了兩種器件建模的優(yōu)缺點(diǎn),得出IBIS模型的優(yōu)勢(shì),并對(duì)PCB進(jìn)行了信號(hào)完整性和電源完整性仿真驗(yàn)證;(3)實(shí)例驗(yàn)證。通過(guò)浪涌信號(hào)發(fā)生器、脈沖群信號(hào)發(fā)生器對(duì)本文所設(shè)計(jì)的電磁兼容解決方案進(jìn)行驗(yàn)證,使用上位機(jī)軟件顯示驗(yàn)證結(jié)果,對(duì)不完善的設(shè)計(jì)分析其原理,更改設(shè)計(jì)方案,然后再次進(jìn)行驗(yàn)證;本文所討論的電磁兼容方案已取得3C認(rèn)證證書,應(yīng)用于郴州大沖風(fēng)電場(chǎng),提高了PLC運(yùn)行的安全性和可靠性,具有良好的應(yīng)用前景。
[Abstract]:As the most effective way to utilize wind energy, wind power has become an important part of sustainable development and economic growth in China.As the core component of wind power system, PLC (Programmable Logic Controller) needs to adapt to the complex working environment, and the stability and reliability of PLC are higher in the fan control system.In industrial control, EMC performance is usually used to evaluate the stability and reliability of PLC system.In this paper, according to the project of "nationalization of main control PLC system of fan", it is urgent to improve the EMC performance of home-made PLC system in view of the various EMI interference problems that occur in the trial operation stage of domestic PLC system.Based on the analysis of EMC theory, this paper puts forward a set of solutions to the domestic PLC EMC problem, and successfully integrates this scheme into the domestic PLC design process.On the premise of synthetically analyzing the existing EMC design technology and absorbing the design scheme which is helpful to improve the reliability of EMC in domestic PLC, the design scheme is analyzed by simulation tools. Finally,The electromagnetic compatibility reliability of the whole PLC system is verified by engineering instruments.The main work of this paper is to study the difficulties and key technologies of EMC technology.Combined with the current situation of PLC EMC at home and abroad, the problems in EMC design of PLC are analyzed, and the interference sources and interference signals in wind power controller unit are analyzed, including its propagation path and coupling mode.The interference mode is decomposed into weak magnetic field coupling and weak electric field coupling, and their respective two-port circuit models are established to calculate the interference voltage and current.The characteristics of electromagnetic compatibility (EMC) technology, including shielding, filtering, grounding and isolation, are analyzed, and the design and simulation of EMC schematic diagram suitable for this paper are put forward.The communication ports of home-made PLC system including Ethernet port can port bus adapter port power port digital port and analog sensor signal port are designed for EMC schematic design.Altium Designer software is used to design and verify the EMC of PCB board.This paper analyzes the advantages and disadvantages of two kinds of device modeling, obtains the advantages of IBIS model, and verifies the signal integrity and power integrity of PCB by simulation.The EMC solution designed in this paper is verified by surge signal generator and pulse group signal generator. The software of upper computer is used to display the verification result. The principle of imperfect design is analyzed and the design scheme is changed.The EMC scheme discussed in this paper has obtained 3C certification and has been applied to Chenzhou Dachong wind farm, which improves the security and reliability of PLC operation and has a good application prospect.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;TN03;TM315

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