【摘要】：隨著“工業(yè)4.0”概念的提出,我國積極參與并加快發(fā)展工業(yè)科學技術(shù),感應加熱技術(shù)在工業(yè)冶煉行業(yè)中得到廣泛應用。當前傳統(tǒng)感應加熱控制器多采用模擬器件結(jié)合經(jīng)典控制策略的系統(tǒng)模式,該模式在控制過程及輸出效果上,存在著諸多不足之處。因此,設(shè)計一款數(shù)字化、智能化的控制器,對提高感應加熱控制器的控制效果及工作效率是具有價值的。針對傳統(tǒng)感應加熱控制器存在的溫度漂移、電路復雜、穩(wěn)定性差等缺陷,以及加熱過程中普通控制方法,無法有效改善的溫度非線性時變問題,本文以90kW/1kHz中頻感應加熱半橋串聯(lián)主拓撲電路為研究對象,并對其工作特性進行分析,提出了一種基于FPGA的復合調(diào)功算法,并在Simulink中進行了可行性驗證及樣機的設(shè)計與測試。具體工作如下:首先,分析了串聯(lián)半橋主拓撲電路的工作模式及負載特性,提出了一種脈沖寬度與脈沖頻率結(jié)合的復合調(diào)功策略;其次在Simulink環(huán)境下搭建了感應加熱系統(tǒng)模型,采用鎖相環(huán)與模糊-P[多模態(tài)控制算法實現(xiàn)感應加熱調(diào)功策略,并對比了傳統(tǒng)PI算法和模糊-PI多模態(tài)算法在本系統(tǒng)中的控制效果。仿真結(jié)果表明,基于模糊-PI多模態(tài)算法的復合調(diào)功策略是可行的,且在穩(wěn)、快、準以及抗干擾方面具有一定的優(yōu)越性;在此基礎(chǔ)上,計算了主回路各器件的參數(shù),并設(shè)計了以FPGA為核心的觸發(fā)控制系統(tǒng),主要設(shè)計與測試的模塊有:FPGA最小系統(tǒng)、反饋信號A/D采集模塊、它激轉(zhuǎn)自激啟動模塊、反饋信號調(diào)理模塊、隔離驅(qū)動及保護模塊;最后在軟件上采用純邏輯器件實現(xiàn)了鎖相環(huán)的信號跟蹤功能。搭建了Qsys系統(tǒng)并利用N1OS II實現(xiàn)功率閉環(huán)調(diào)節(jié)�；谏鲜鲕浻布O(shè)計搭建了實驗樣機,完成了對中頻感應加熱串聯(lián)半橋智能控制器的調(diào)節(jié)與測試。實驗結(jié)果表明,利用復合調(diào)功策略的半橋串聯(lián)拓撲電路,實現(xiàn)了頻率的跟蹤與恒功率輸出控制,提高了功率因數(shù),減少了開關(guān)管的功率損耗,使系統(tǒng)具有更強的魯棒性和適應能力,對中頻感應加熱冶煉行業(yè)的發(fā)展具有一定的參考意義。
[Abstract]:With the concept of "Industrial 4.0" put forward, our country actively participates in and accelerates the development of industrial science and technology, induction heating technology has been widely used in industrial smelting industry. At present, the traditional induction heating controller mostly adopts the system mode of analog device combined with classical control strategy. There are many shortcomings in the control process and output effect of this mode. Therefore, it is valuable to design a digital and intelligent controller to improve the control effect and working efficiency of induction heating controller. Aiming at the defects of traditional induction heating controller, such as temperature drift, complex circuit, poor stability and so on, as well as the non-linear time-varying problem of temperature which can not be improved effectively by ordinary control methods in heating process. In this paper, the 90kW/1kHz mid-frequency induction heating half-bridge series main topology circuit is studied, and its working characteristics are analyzed. A hybrid power regulation algorithm based on FPGA is proposed, and the feasibility verification and prototype design and test in Simulink are carried out. The concrete work is as follows: firstly, the working mode and load characteristics of the series half-bridge main topology circuit are analyzed, and a hybrid power regulation strategy combining pulse width and pulse frequency is proposed. Secondly, the induction heating system model is built in the environment of Simulink, and the phase-locked loop and fuzzy-P [multi-modal control algorithm] are used to realize the power regulation strategy of induction heating. The control effects of traditional PI algorithm and fuzzy-PI multimodal algorithm in this system are compared. The simulation results show that the hybrid power regulation strategy based on fuzzy-PI multi-mode algorithm is feasible and has some advantages in stability, fast, accurate and anti-jamming. On this basis, the parameters of each device in the main loop are calculated, and the trigger control system based on FPGA is designed. The main modules of design and test are: FPGA minimum system, feedback signal A / D acquisition module, which activates self-excited start-up module. Feedback signal conditioning module, isolation drive and protection module; Finally, the signal tracking function of PLL is realized by using pure logic device in the software. The Qsys system is built and the power closed loop regulation is realized by using N1OS II. Based on the above-mentioned hardware and software design, an experimental prototype is built, and the regulation and test of the intelligent controller for mid-frequency induction heating series half-bridge is completed. The experimental results show that the frequency tracking and constant power output control are realized by using the half-bridge series topology circuit based on the compound power regulation strategy, the power factor is improved and the power loss of the switch tube is reduced. The system has stronger robustness and adaptability, and has certain reference significance for the development of intermediate frequency induction heating smelting industry.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP273

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