本文選題：變頻器　切入點：低電壓穿越　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：變頻器作為一種性能優(yōu)良的調(diào)速裝置已廣泛應(yīng)用于發(fā)電廠,然而當(dāng)電廠發(fā)生廠內(nèi)電壓跌落時易觸發(fā)變頻器欠壓保護,引起相關(guān)系統(tǒng)的一系列動作,嚴(yán)重時可導(dǎo)致發(fā)電機組跳機。因此,變頻器的低電壓穿越問題受到了廣泛關(guān)注。變頻器本身無低電壓穿越功能,本體難以改造,所以配置一定的輔助設(shè)備以實現(xiàn)變頻器的低電壓穿越功能具有重要的現(xiàn)實意義。 論文通過參閱相關(guān)國內(nèi)外文獻(xiàn),確立了系統(tǒng)設(shè)計的目標(biāo),提出采用加裝電力電子裝置實現(xiàn)變頻器低電壓穿越功能的方案。論文詳細(xì)闡述了火電廠輔機變頻器低電壓穿越電源的原理,以單重BOOST DC/DC電路為基礎(chǔ),建立了PSLFI(Power Supply with LVRT Capability for Frequency Inverters)的數(shù)學(xué)模型,探討了其工作模式及處于運行模式時的起動、退出判據(jù)。在此基礎(chǔ)上,討論了PSLFI的軟硬件設(shè)計的關(guān)鍵問題。在硬件設(shè)計方面,以BOOST基本DC/DC電路為基礎(chǔ),設(shè)計了包括三相不控整流及三重交錯并聯(lián)的BOOST的拓?fù)浣Y(jié)構(gòu),并根據(jù)設(shè)計要求,確定了PSLFI元器件參數(shù)及控制輔助電路。在軟件設(shè)計方面,在雙閉環(huán)控制方法的基礎(chǔ)上,提出了外環(huán)采用優(yōu)化的模糊自適應(yīng)PI控制算法與bang-bang滯環(huán)控制結(jié)合的復(fù)合算法。利用自行開發(fā)的控制器及RTDS實時仿真系統(tǒng),完成了硬件在環(huán)的閉環(huán)仿真實驗,仿真結(jié)果驗證了參數(shù)設(shè)計的合理性,并為現(xiàn)場實驗中的PI參數(shù)的調(diào)試起到了指導(dǎo)作用。 最后,在某電廠內(nèi)與給煤機、變頻器進行了現(xiàn)場聯(lián)機實驗。實驗結(jié)果表明：論文設(shè)計的PSLFI在給煤機系統(tǒng)電壓跌落不同深度時,均可實現(xiàn)額定狀態(tài)下直流穩(wěn)定輸出,且變頻器控制電源也能保證給煤機變頻器控制回路可靠運行,保證了在系統(tǒng)電壓跌落時,變頻器及敏感負(fù)荷無擾動運行。
[Abstract]:As the inverter speed regulating device with excellent performance has been widely used in power plants, however, when the plant is easy to trigger voltage drop occurred in inverter undervoltage protection, causing a series of actions related to the system, which can lead to the generator tripping. Therefore, low voltage across the inverter has been widely concerned. The inverter itself low voltage ride through the function of ontology, difficult transformation, has important practical significance so configure some auxiliary equipment to achieve frequency converter LVRT.
This paper by referring to relevant literature at home and abroad to establish the target of system design, the installation of power electronic device to realize the function of low voltage ride through the inverter. The paper elaborates on the principle of low voltage ride through the power of the auxiliary inverter power plant, with single BOOST DC/DC circuit as the foundation, established the PSLFI (Power Supply with LVRT Capability for Frequency Inverters) mathematical model, discusses its working mode and at the start, the operation mode of the exit criteria. On this basis, discussed the key problems of design of hardware and software of PSLFI. In the aspect of hardware design, the BOOST basic DC/DC circuit as the foundation, the design of topology including three-phase uncontrolled rectifier and BOOST three interleaved, and according to the design requirements, to determine the PSLFI parameters and control components auxiliary circuit. In software design, the double closed-loop control method based on Based on the proposed loop using composite algorithm of adaptive fuzzy PI control algorithm and bang-bang with hysteresis control optimization. Using the self-developed controller and the RTDS real-time simulation system, the hardware in the loop simulation test loop, the simulation results verify the rationality of parameter design, and debugging for the PI parameter in the experiment site plays a guiding role.
Finally, in a power plant and coal feeder, the inverter conducted on-site on-line experiment. The experimental results show that the design of the PSLFI in the coal feeder system voltage sag at different depths, can stabilize the output DC under rated condition, and frequency converter control power supply can also ensure that the coal feeder control circuit of frequency converter to ensure reliable operation. The drop in the system voltage, frequency converter and load sensitive operation without disturbance.

【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM921.51

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本文編號：1614112