本文選題：鏈?zhǔn)届o止同步補(bǔ)償器　切入點(diǎn)：滑窗迭代離散傅立葉變換　出處：《西安理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：近些年,由于電網(wǎng)日趨復(fù)雜,人們投入大量的非線性、沖擊性負(fù)載,配網(wǎng)中產(chǎn)生的無(wú)功源、諧波源導(dǎo)致電能質(zhì)量問(wèn)題越來(lái)越嚴(yán)重。在提高電能質(zhì)量方面,鏈?zhǔn)届o止同步補(bǔ)償器(static synchronous compensator, STATCOM)不僅能夠動(dòng)態(tài)實(shí)時(shí)對(duì)無(wú)功電流進(jìn)行補(bǔ)償,還可以結(jié)合有源電力濾波技術(shù)進(jìn)行諧波抑制。因其動(dòng)態(tài)響應(yīng)快、模塊化設(shè)計(jì)、高可靠性等諸多優(yōu)點(diǎn),得到廣泛的工程應(yīng)用。隨著不斷的深入,其中鏈?zhǔn)絊TATCOM的控制方法成為研究熱點(diǎn)。本文詳細(xì)分析了鏈?zhǔn)絊TATCOM的主電路拓?fù)浣Y(jié)構(gòu)及基本原理,對(duì)數(shù)學(xué)模型進(jìn)行理論推導(dǎo)。為使鏈?zhǔn)絊TATCOM具備諧波抑制能力,采用同步旋轉(zhuǎn)坐標(biāo)變換及滑窗迭代離散傅立葉變換相結(jié)合的指令電流檢測(cè)方法,仿真及實(shí)驗(yàn)均驗(yàn)證了該方法正確可行,能精確的檢測(cè)到負(fù)載的無(wú)功及諧波電流。對(duì)于電流跟蹤控制方法,傳統(tǒng)的PI控制器對(duì)特定次諧波的補(bǔ)償能力難以達(dá)到控制目標(biāo),本文采用PI控制與矢量比例積分(vector proportion integral,VPI)控制相結(jié)合的電流跟蹤控制,分別對(duì)傳統(tǒng)PI控制及所采用的PI-VPI控制進(jìn)行仿真及結(jié)果分析。經(jīng)過(guò)對(duì)比,證明了 PI-VPI控制效果更好。主電路H橋結(jié)構(gòu)的直流側(cè)電容電壓能否平衡直接影響著系統(tǒng)的穩(wěn)定運(yùn)行,本文采取有功矢量疊加的控制方法實(shí)現(xiàn)均壓控制。當(dāng)補(bǔ)償無(wú)功和抑制諧波的容量需求超出裝置設(shè)計(jì)容量時(shí),需要采取有效的限流控制方法以滿(mǎn)足電網(wǎng)電能質(zhì)量的要求。文中針對(duì)實(shí)際運(yùn)行中出現(xiàn)指令電流超出裝置額定電流的狀況,提出了結(jié)合目標(biāo)功率因數(shù)法的優(yōu)先級(jí)限流控制方法,該方法在滿(mǎn)足系統(tǒng)功率因數(shù)的情況下同時(shí)提高諧波抑制能力。在MATLAB/Simulink中搭建仿真模型,進(jìn)行結(jié)果分析證明了上述控制方法的可行性和有效性。在鏈?zhǔn)絊TATCOM的實(shí)驗(yàn)平臺(tái)上,實(shí)現(xiàn)DSP及FPGA的聯(lián)合軟件控制。在該實(shí)驗(yàn)平臺(tái)上對(duì)本文所采用的各種控制方法進(jìn)行實(shí)驗(yàn)驗(yàn)證,通過(guò)實(shí)驗(yàn)結(jié)果分析,驗(yàn)證了上述控制方法的正確性和有效性。
[Abstract]:In recent years, due to the increasingly complex power network, people put in a large number of nonlinear, impact load, reactive power sources generated in the distribution network, harmonic sources lead to more and more serious power quality problems. The chain static synchronous compensator can not only compensate reactive current dynamically in real time, but also suppress harmonics in combination with active power filter, because of its advantages of fast dynamic response, modular design, high reliability and so on. It has been widely used in engineering. With the development of STATCOM, the control method of chain STATCOM has become a hot topic. The topology and basic principle of main circuit of chain STATCOM are analyzed in detail in this paper. The mathematical model is derived theoretically. In order to make the chain STATCOM possess the ability of harmonic suppression, the instruction current detection method combining synchronous rotation coordinate transform and sliding window iterative discrete Fourier transform is adopted. The simulation and experiments show that the method is correct and feasible, and can accurately detect the reactive power and harmonic current of load. For the current tracking control method, the traditional Pi controller is difficult to achieve the control goal of compensating the specific subharmonics. In this paper, the traditional Pi control and the PI-VPI control are simulated and the results are analyzed by using the current tracking control which combines Pi control with vector integral proportion VPI control. It is proved that the control effect of PI-VPI is better. Whether or not the capacitance voltage of the DC side of the H-bridge structure of the main circuit can balance directly affects the stable operation of the system. In this paper, the active power vector superposition control method is adopted to realize the voltage sharing control. When the capacity of compensating reactive power and suppressing harmonics exceeds the designed capacity of the device, Effective current limiting control method is needed to meet the requirement of power quality. In view of the situation that the instruction current exceeds the rated current of the device in actual operation, a priority current limiting control method combined with the target power factor method is proposed in this paper. This method can improve the harmonic suppression ability while satisfying the power factor of the system. The simulation model is built in MATLAB/Simulink, and the results show that the control method is feasible and effective. The joint software control of DSP and FPGA is realized. On this experimental platform, various control methods used in this paper are verified experimentally, and the correctness and effectiveness of the above control methods are verified by the analysis of experimental results.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM761.12

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