本文選題：電壓跟蹤保持器 + 雙閉環(huán)控制�。� 參考：《東北大學(xué)》2014年碩士論文

【摘要】：隨著信息科學(xué)技術(shù)的發(fā)展,人們更加注重電能質(zhì)量的高低。由于大量非線性設(shè)備的使用,電網(wǎng)中存在大量的諧波污染,導(dǎo)致電壓波動(dòng)、頻率變化,電能質(zhì)量變差。因電能質(zhì)量問(wèn)題導(dǎo)致交流接觸器脫扣帶來(lái)的設(shè)備運(yùn)行中斷,給企業(yè)帶來(lái)巨大的經(jīng)濟(jì)損失甚至人員傷亡。上述問(wèn)題盡管可以通過(guò)使用不問(wèn)斷電源(UPS)予以解決,但由于UPS體積龐大以及價(jià)格高昂,為其在工業(yè)企業(yè)中的應(yīng)用帶來(lái)不便。國(guó)內(nèi)許多工業(yè)企業(yè)受電能質(zhì)量差導(dǎo)致交流接觸器脫扣的困擾,但市面上專門(mén)用于解決上述問(wèn)題且性能可靠的產(chǎn)品稀少,現(xiàn)急需加強(qiáng)創(chuàng)新和科技成果的轉(zhuǎn)化,開(kāi)發(fā)出一款具有自主知識(shí)產(chǎn)權(quán)的能應(yīng)對(duì)上述情況的產(chǎn)品。本文針對(duì)電壓波動(dòng)、欠壓和中斷等導(dǎo)致交流接觸器脫扣的問(wèn)題,做了如下研究：(1)分析工業(yè)企業(yè)對(duì)電網(wǎng)電壓跟蹤保持器的功能要求以及技術(shù)要求,確定系統(tǒng)整體結(jié)構(gòu)和控制策略。(2)建立電壓跟蹤保持器的主逆變電路的連續(xù)狀態(tài)模型與離散數(shù)字模型,理論推導(dǎo)設(shè)計(jì)的基礎(chǔ)原理,證明全橋PWM逆變可產(chǎn)生等效正弦波。(3)分析單相PWM逆變器的單閉環(huán)和雙閉環(huán)控制策略,針對(duì)傳統(tǒng)的雙閉環(huán)控制在交流系統(tǒng)中無(wú)法完全發(fā)揮PID的快速跟蹤能力問(wèn)題,重點(diǎn)研究了d-q坐標(biāo)變換在單相中的實(shí)現(xiàn)方法,并將其應(yīng)用在雙閉環(huán)控制中,得到具有直流跟蹤特性的改進(jìn)性雙閉環(huán)控制策略。通過(guò)搭建Matlab實(shí)驗(yàn)仿真模型對(duì)改進(jìn)的雙閉環(huán)控制策略進(jìn)行仿真驗(yàn)證。(4)根據(jù)系統(tǒng)整體結(jié)構(gòu)框圖,對(duì)各部分硬件電路進(jìn)行詳細(xì)設(shè)計(jì),在設(shè)計(jì)中為保證系統(tǒng)的可靠,采用了多種防干擾設(shè)計(jì)方法,并對(duì)設(shè)計(jì)好的硬件電路進(jìn)行了細(xì)致調(diào)試。(5)按照功能要求,編寫(xiě)了各部分軟件程序,包括電壓狀態(tài)判斷、A/D采樣、相位跟蹤、保護(hù)程序等。結(jié)合硬件電路對(duì)軟件進(jìn)行調(diào)試,通過(guò)實(shí)物驗(yàn)證了控制的可行性以及硬件的可靠性。本文研究的改進(jìn)型雙閉環(huán)控制算法能很好的解決上述問(wèn)題。通過(guò)分析電壓狀態(tài),觸發(fā)電網(wǎng)電壓跟蹤保持器逆變輸出正弦電壓,保持交流接觸器持續(xù)吸合,克服短時(shí)電能質(zhì)量差的問(wèn)題,保障工業(yè)過(guò)程中設(shè)備的連續(xù)穩(wěn)定運(yùn)行。
[Abstract]:With the development of information science and technology, people pay more attention to power quality. Due to the use of a large number of nonlinear equipment, there are a large number of harmonic pollution in the power network, resulting in voltage fluctuations, frequency changes and power quality deterioration. Because of the power quality problem, the equipment operation is interrupted by AC contactor tripping, which brings huge economic loss and even casualties to the enterprise. Although these problems can be solved by using uninterrupted power supply (UPS), the application of UPS in industrial enterprises is inconvenient because of its large size and high price. Many industrial enterprises in China are troubled by AC contactor tripping due to poor power quality. However, there are few products in the market that are specially used to solve the above problems and have reliable performance. It is urgent to strengthen the transformation of innovation and scientific and technological achievements. To develop a product with independent intellectual property rights that can deal with the above situation. In order to solve the problems of voltage fluctuation, undervoltage and interruption which lead to AC contactor tripping, this paper has done the following research: (1) analyze the functional requirements and technical requirements of voltage tracker in power system. The overall structure and control strategy of the system are determined. (2) the continuous state model and discrete digital model of the main inverter circuit of the voltage tracker are established. It is proved that full-bridge PWM inverter can produce equivalent sine wave. (3) the single-loop and double-closed-loop control strategies of single-phase PWM inverter are analyzed. In order to solve the problem that the traditional double-closed loop control can not give full play to the fast tracking ability of pid in AC system, The realization method of d-q coordinate transformation in single phase is studied and applied to double closed loop control. An improved double closed loop control strategy with DC tracking characteristics is obtained. The improved double-closed loop control strategy is simulated and verified by building Matlab simulation model. (4) according to the overall structure of the system, the hardware circuits are designed in detail, in order to ensure the reliability of the system in the design. Various anti-interference design methods are adopted, and the designed hardware circuits are debugged carefully. (5) according to the functional requirements, various software programs are written, including voltage state judgment / A / D sampling, phase tracking, protection program and so on. The feasibility of the control and the reliability of the hardware are verified by debugging the software with the hardware circuit. The improved double-loop control algorithm studied in this paper can solve the above problems well. By analyzing the voltage state, the inverter output sinusoidal voltage is triggered, the AC contactor is continuously sucked, the problem of short time power quality is overcome, and the continuous and stable operation of the equipment in the industrial process is ensured.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM572.2

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本文編號(hào)：2084078