本文選題：三相四線制三電平 + 三維空間矢量調(diào)制�。� 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：在三相四線制低壓供電系統(tǒng)中,隨著電力電子裝置及各種非線性負(fù)荷的廣泛投入使用,電網(wǎng)被注入大量諧波,中線承受負(fù)荷也越來(lái)越重。有源電力濾波器(Active Power Filter)由于可以動(dòng)態(tài)補(bǔ)償諧波與無(wú)功,因而近年來(lái)在諧波治理方面受到廣泛關(guān)注。本文以三相四線制三電平電容中分式有源電力濾波器為研究對(duì)象,建立其在abc坐標(biāo)系、αβ0坐標(biāo)系下的數(shù)學(xué)模型。分析電容電壓與相電流的數(shù)學(xué)關(guān)系,得出各矢量狀態(tài)對(duì)中點(diǎn)電位的影響,并引出中點(diǎn)平衡因子指標(biāo)衡量中點(diǎn)電位的偏移情況。詳細(xì)分析abc坐標(biāo)系下的三維空間矢量調(diào)制策略,對(duì)通過(guò)三維子空間擴(kuò)展實(shí)現(xiàn)中點(diǎn)電位平衡的方法進(jìn)行詳細(xì)介紹。針對(duì)三維空間矢量調(diào)制的復(fù)雜性,以伏秒平衡為基礎(chǔ),提出了三相四線制三電平電容中分式拓?fù)涞暮?jiǎn)化調(diào)制策略。簡(jiǎn)化調(diào)制策略無(wú)需在三維空間進(jìn)行復(fù)雜的矢量合成,直接從單相入手進(jìn)行簡(jiǎn)單的伏秒平衡計(jì)算。類比于三維空間中的子空間擴(kuò)展,提出了適用于簡(jiǎn)化調(diào)制策略的矢量狀態(tài)擴(kuò)展方法以實(shí)現(xiàn)中點(diǎn)電位平衡。通過(guò)三相矢量合成運(yùn)算,證明了矢量狀態(tài)擴(kuò)展前后參考電壓矢量的一致性,為本文提出的簡(jiǎn)化調(diào)制策略提供了理論支撐。進(jìn)一步地,通過(guò)對(duì)比三維空間矢量調(diào)制與簡(jiǎn)化調(diào)制策略的占空比結(jié)果,證明了本文所提出的簡(jiǎn)化調(diào)制策略與三維空間矢量調(diào)制的歸一化特性。以平均中點(diǎn)控制因子作為評(píng)判調(diào)制算法對(duì)中點(diǎn)控制能力的指標(biāo),推導(dǎo)了本文提出的簡(jiǎn)化調(diào)制算法下的平均中點(diǎn)控制因子表達(dá)式。最后對(duì)所提出的簡(jiǎn)化調(diào)制策略進(jìn)行了仿真與實(shí)驗(yàn)驗(yàn)證,仿真與實(shí)驗(yàn)結(jié)果表明該簡(jiǎn)化調(diào)制算法不但運(yùn)算量小,而且中點(diǎn)控制能力強(qiáng)。闡述了重復(fù)控制的基本思想,分別從穩(wěn)定性,擾動(dòng)抑制,誤差收斂,穩(wěn)態(tài)誤差四個(gè)方面對(duì)重復(fù)控制的特性進(jìn)行分析。針對(duì)重復(fù)控制器動(dòng)態(tài)響應(yīng)慢的缺點(diǎn),將重復(fù)控制器與PI串聯(lián),并給出了其詳細(xì)的設(shè)計(jì)過(guò)程。針對(duì)傳統(tǒng)重復(fù)控制無(wú)法適應(yīng)電網(wǎng)頻率變化的缺點(diǎn),將分?jǐn)?shù)階重復(fù)控制應(yīng)用于三相四線制三電平電容中分式有源電力濾波器。通過(guò)仿真對(duì)分?jǐn)?shù)階重復(fù)控制進(jìn)行了驗(yàn)證,仿真結(jié)果表明分?jǐn)?shù)階重復(fù)控制在電網(wǎng)頻率變化時(shí)仍具有較好的穩(wěn)態(tài)精度。最后以不控整流橋構(gòu)造的三相不平衡負(fù)載對(duì)重復(fù)控制串聯(lián)PI的穩(wěn)態(tài)精度,動(dòng)態(tài)性能進(jìn)行了實(shí)驗(yàn)測(cè)試。設(shè)計(jì)完成基于DSP+FPGA的數(shù)字控制系統(tǒng)。在該系統(tǒng)平臺(tái)上,選用了兩組均含有直流分量的三相非線性不平衡負(fù)載,對(duì)本文所研究的調(diào)制策略與控制策略進(jìn)行了實(shí)驗(yàn)驗(yàn)證。
[Abstract]:In the three-phase four-wire low voltage power supply system, with the wide application of power electronic devices and various nonlinear loads, the power grid is injected a large number of harmonics, and the load of the middle line is more and more heavy. Active Power filter (APF) has attracted wide attention in harmonic control in recent years because it can dynamically compensate harmonic and reactive power. In this paper, a three-phase four-wire three-level capacitor with fractional active power filter is studied and its mathematical model in abc coordinate system and 偽 尾 0 coordinate system is established. By analyzing the mathematical relationship between capacitance voltage and phase current, the effect of vector states on midpoint potential is obtained, and the midpoint equilibrium factor is introduced to measure the offset of midpoint potential. The three-dimension space vector modulation strategy in abc coordinate system is analyzed in detail, and the method of realizing the potential balance of the middle point through the expansion of three-dimensional subspace is introduced in detail. In view of the complexity of 3D space vector modulation, a simplified modulation strategy of fractional topology in three-level capacitor with three-phase four-wire system is proposed, based on volt-second balance. The simplified modulation strategy does not need to perform complex vector synthesis in three dimensional space, and a simple Volton-second balance calculation is carried out directly from single phase. Analogous to the subspace expansion in three dimensional space, a vector state expansion method suitable for simplified modulation strategy is proposed to realize the neutral point potential balance. The consistency of the reference voltage vector before and after the vector state expansion is proved by the three-phase vector synthesis operation, which provides a theoretical support for the simplified modulation strategy proposed in this paper. Furthermore, by comparing the duty cycle results of 3D space vector modulation and simplified space vector modulation strategy, the normalized characteristics of the simplified modulation strategy and three dimensional space vector modulation proposed in this paper are proved. The average midpoint control factor is used as the index to judge the ability of modulation algorithm to control the midpoint, and the expression of average midpoint control factor under simplified modulation algorithm is derived. Finally, the proposed simplified modulation strategy is simulated and verified by experiments. The simulation and experimental results show that the proposed simplified modulation algorithm not only has less computation, but also has strong midpoint control ability. The basic idea of repetitive control is expounded. The characteristics of repetitive control are analyzed from four aspects: stability, disturbance suppression, error convergence and steady-state error. Aiming at the shortcoming of slow dynamic response of repetitive controller, the repetitive controller and Pi are connected in series, and the detailed design process is given. In view of the disadvantage that the traditional repetitive control can not adapt to the frequency change of the power system, fractional repetitive control is applied to the three-phase four-wire three-level capacitor fractional active power filter. The simulation results show that the fractional repetitive control still has a good steady-state accuracy when the frequency of the power system changes. Finally, the steady-state precision and dynamic performance of repeated control series Pi are tested by three-phase unbalanced load constructed by uncontrolled rectifier bridge. Design and complete the digital control system based on DSP FPGA. On the platform of the system, two groups of three-phase nonlinear unbalanced loads with DC component are selected, and the modulation and control strategies studied in this paper are experimentally verified.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM761

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本文編號(hào)：1959132