【摘要】：中科院強(qiáng)磁場中心的40T穩(wěn)態(tài)強(qiáng)磁場裝置的磁體由內(nèi)水冷磁體和外超導(dǎo)磁體兩部分組成,其中的外超導(dǎo)磁體需要一個最大輸出8V/16KA的電源,且對電流和電壓的穩(wěn)定度有很高的要求。超導(dǎo)磁體電源目前采用的是傳統(tǒng)的雙反星形可控硅整流方案,該方案最主要缺點(diǎn)是設(shè)備體積很大。另一種備選方案是基于開關(guān)電源設(shè)計,一般而言,高頻開關(guān)電源具有更小的體積且容易做到更高的效率,但僅靠LC濾波難以濾除開關(guān)電源前級三相不可控整流帶來的低頻紋波,且電源無法輸出負(fù)電壓用于使磁體電流可控下降。 論文第2章首先介紹了各種逆變電路和整流電路并結(jié)合超導(dǎo)磁體電源的需求選擇了原邊全橋逆變加副邊全波整流作為電源主回路的基本拓?fù)洹榱私档蛽p耗,在基本拓?fù)涞幕A(chǔ)上采用了原邊串聯(lián)飽和電感的移相全橋軟開關(guān)技術(shù)和副邊的同步整流技術(shù)。在第2章的最后給出了磁體電源的總拓?fù)洳⒑喴枋隽藬M采用的失超保護(hù)方案。接著的第3章對主拓?fù)涓鲄?shù)進(jìn)行了計算。 為了更好地減小輸出紋波,在開關(guān)變換器的輸出端添加了有源濾波裝置。論文第4章首先介紹了各種直流有源濾波器,然后重點(diǎn)分析了超導(dǎo)磁體電源選用串聯(lián)線性有源濾波的原因。其中一個核心原因是將串聯(lián)線性有源濾波與同步整流電路相結(jié)合,并通過恰當(dāng)?shù)目刂品绞?可以使電源輸出負(fù)電壓。在第4章的最后對串聯(lián)線性有源濾波中MOSFET調(diào)整管的導(dǎo)通內(nèi)阻調(diào)整能力進(jìn)行了具體分析。 論文第5章首先給出了將有源濾波環(huán)節(jié)的控制系統(tǒng)和開關(guān)變換器環(huán)節(jié)的控制系統(tǒng)聯(lián)系起來使其可以協(xié)同工作的總體控制方案。對于有源濾波環(huán)節(jié)的反饋控制系統(tǒng),在電路建模的基礎(chǔ)上,結(jié)合波特圖設(shè)計了電壓內(nèi)環(huán)電流外環(huán)的雙閉環(huán)控制系統(tǒng)；對于開關(guān)變換器環(huán)節(jié)的控制系統(tǒng),在考慮了調(diào)整管導(dǎo)通電阻對開環(huán)傳遞函數(shù)的影響的基礎(chǔ)上,基于第2章中的主拓?fù)浣＝Y(jié)論演化后給出了具體的PID補(bǔ)償網(wǎng)絡(luò)設(shè)計方法。在第5章的最后簡要介紹了開關(guān)變換器環(huán)節(jié)也可以采用的峰值電流控制方式。 為了驗(yàn)證前述章節(jié)中磁體電源主回路和控制回路設(shè)計的正確性,在第6章中設(shè)計了一個樣機(jī)電源并給出了開關(guān)變換器軟開關(guān)效果的仿真驗(yàn)證結(jié)果、直流有源濾波器環(huán)節(jié)濾波效果的仿真驗(yàn)證結(jié)果和整體控制系統(tǒng)的動態(tài)響應(yīng)效果仿真驗(yàn)證結(jié)果,最后給出了樣機(jī)實(shí)驗(yàn)測試結(jié)果。仿真和實(shí)驗(yàn)測試結(jié)果表明整體控制方案中的兩個反饋控制環(huán)節(jié)協(xié)同工作良好,電源輸出穩(wěn)定度很高。 論文的第7章對全文完成的工作進(jìn)行了總結(jié),并提出了對后續(xù)研究的展望。
[Abstract]:The magnet of the 40T steady-state strong magnetic field device in the center of the strong magnetic field of the Chinese Academy of Sciences consists of two parts: the inner water-cooled magnet and the outer superconducting magnet, among which the external superconducting magnet needs a power source with the maximum output of 8V/16KA. The stability of current and voltage is very high. At present, the superconducting magnet power supply adopts the traditional double inverse star SCR rectifier. The main disadvantage of this scheme is the large size of the equipment. Another alternative is based on the switching power supply design. Generally speaking, the high frequency switching power supply is smaller in volume and easier to achieve higher efficiency, but it is difficult to filter the low frequency ripple caused by the three-phase uncontrollable rectifier in the front stage of the switching power supply by LC filtering alone. And the power supply can not output the negative voltage to make the magnets current controllable descent. In chapter 2, various inverter circuits and rectifier circuits are introduced firstly. Combined with the demand of superconducting magnet power supply, the primary full-bridge inverter plus auxiliary full-wave rectifier is selected as the basic topology of the main circuit of the power supply. In order to reduce the loss, the phase-shifted full-bridge soft switching technology of the primary edge series saturated inductor and the synchronous rectifying technology of the auxiliary edge are adopted on the basis of the basic topology. At the end of chapter 2, the total topology of the magnet power supply is given, and the proposed scheme is briefly described. Then the main topology parameters are calculated in Chapter 3. In order to reduce the output ripple, an active filter is added to the output of the converter. In chapter 4, we first introduce various DC active filters, and then analyze the reason why series linear active filter is used in superconducting magnet power supply. One of the key reasons is that the series linear active filter is combined with the synchronous rectifier circuit and the output negative voltage of the power supply can be made by proper control mode. At the end of chapter 4, the on resistance adjustment ability of MOSFET regulator in series linear active filter is analyzed in detail. In chapter 5, a general control scheme is presented, which combines the active filter control system and the switching converter control system to make it work together. For the feedback control system of active filter link, based on the circuit modeling, a double closed loop control system with voltage inner loop, current outer loop and external loop is designed. For the control system of switching converter, based on the evolution of the main topology modeling conclusion in Chapter 2, a concrete design method of PID compensation network is given after considering the effect of adjusting on-resistance on open-loop transfer function. At the end of chapter 5, the peak current control mode of switching converter is introduced briefly. In order to verify the correctness of the design of the main circuit and the control circuit of the magnet power supply in the previous chapters, a prototype power supply is designed in Chapter 6, and the simulation results of the soft-switching effect of the switching converter are given. The simulation results of the filter effect of DC active power filter and the dynamic response of the whole control system are verified. Finally, the experimental results of the prototype are given. Simulation and experimental results show that the two feedback control links work well in the overall control scheme, and the output stability of the power supply is very high. Chapter 7 summarizes the work done in this paper, and puts forward the prospect of further research.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM46

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