發(fā)布時(shí)間：2018-05-22 20:03

  本文選題：靜止同步補(bǔ)償器 + LCL濾波器��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來(lái),隨著工業(yè)的發(fā)展,各種非線性、沖擊性及不平衡負(fù)荷迅速增多,由此導(dǎo)致低功率因數(shù),諧波污染,三相不平衡等一系列影響電網(wǎng)電能質(zhì)量的問(wèn)題。靜止同步補(bǔ)償器(Static Synchronous Compensator,簡(jiǎn)稱STATCOM)因具備同時(shí)解決上述問(wèn)題的能力備受關(guān)注,在配電網(wǎng)絡(luò)中具有廣闊的應(yīng)用前景。本文以LCL型級(jí)聯(lián)STATCOM為研究對(duì)象,對(duì)一些關(guān)鍵問(wèn)題進(jìn)行研究。首先,建立LCL型STATCOM在abc靜止坐標(biāo)系和dq旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型,為控制系統(tǒng)的設(shè)計(jì)打下基礎(chǔ)。針對(duì)LCL濾波器參數(shù)設(shè)計(jì)的問(wèn)題,本文在分析濾波原理的基礎(chǔ)上,研究濾波器性能與各參數(shù)之間的關(guān)系,并給出濾波器設(shè)計(jì)的約束條件和設(shè)計(jì)步驟,仿真結(jié)果驗(yàn)證了參數(shù)設(shè)計(jì)的有效性。其次,研究LCL濾波器阻尼策略和電流跟蹤策略。針對(duì)數(shù)字控制系統(tǒng)延遲對(duì)有源阻尼策略的影響,給出了電容電流即時(shí)反饋的有源阻尼方法,通過(guò)將電容電流反饋延時(shí)降低至0.5拍,提高了系統(tǒng)的穩(wěn)定性。為提高裝置的諧波抑制能力,本文引入PI加重復(fù)控制的復(fù)合控制策略。針對(duì)復(fù)合控制在負(fù)荷波動(dòng)時(shí)補(bǔ)償電流畸變的問(wèn)題,提出一種改進(jìn)控制策略,通過(guò)對(duì)比當(dāng)前電流跟蹤誤差和1/6周期前電流跟蹤誤差,調(diào)節(jié)重復(fù)控制器輸入,負(fù)荷波動(dòng)劇烈時(shí)PI控制器單獨(dú)工作,負(fù)荷平穩(wěn)時(shí)重復(fù)控制器投入運(yùn)行。仿真結(jié)果驗(yàn)證了所提控制策略的有效性,且重復(fù)控制器延遲時(shí)間降低至基波周期的1/6,動(dòng)態(tài)響應(yīng)速度得到提升。再次,給出平衡工況下直流側(cè)電壓的分層控制策略。通過(guò)總體電壓控制,相間電壓控制,相內(nèi)電壓控制實(shí)現(xiàn)電容電壓的均衡。本文采用零序電壓注入法實(shí)現(xiàn)相間電壓的均衡控制;針對(duì)相內(nèi)電容電壓不均衡的問(wèn)題,采用同向載波層疊調(diào)制,根據(jù)電容電壓的高低和當(dāng)前充放電狀態(tài)實(shí)時(shí)調(diào)整各模塊的調(diào)制波,維持相內(nèi)電壓的穩(wěn)定。仿真結(jié)果驗(yàn)證了控制策略的有效性。最后,給出負(fù)載不平衡工況下STATCOM的控制策略。針對(duì)正序無(wú)功和負(fù)序電流綜合補(bǔ)償?shù)目刂颇繕?biāo),采用對(duì)稱分量法建立裝置的正負(fù)序數(shù)學(xué)模型,通過(guò)正負(fù)序雙環(huán)控制實(shí)現(xiàn)電流跟蹤;由于STATCOM補(bǔ)償負(fù)序電流,三相直流側(cè)電壓無(wú)法均衡,針對(duì)此問(wèn)題采取零序電壓注入法,并推導(dǎo)出所注入零序電壓與補(bǔ)償電流中無(wú)功和負(fù)序電流的比例相關(guān);針對(duì)STATCOM輸出電壓有限,零序電壓過(guò)大時(shí)輸出電壓過(guò)調(diào)制的問(wèn)題,本文在得到負(fù)序電流補(bǔ)償極限的基礎(chǔ)上,給出了限制負(fù)序指令電流的控制策略,仿真結(jié)果表明,所提控制策略在負(fù)載不平衡度較大時(shí)能夠保證裝置穩(wěn)定,有效補(bǔ)償負(fù)序電流。
[Abstract]:In recent years, with the development of industry, all kinds of nonlinear, impact and unbalanced load increase rapidly, which leads to a series of problems affecting power quality, such as low power factor, harmonic pollution, three-phase imbalance and so on. Static Synchronous compensator (Statcom) has attracted much attention for its ability to solve the above problems at the same time, so it has a broad application prospect in distribution networks. In this paper, some key problems of LCL cascaded STATCOM are studied. Firstly, the mathematical models of LCL type STATCOM in the abc stationary coordinate system and the dq rotation coordinate system are established, which lay the foundation for the design of the control system. Aiming at the problem of parameter design of LCL filter, based on the analysis of filter principle, the relationship between filter performance and parameters is studied, and the constraint conditions and design steps of filter design are given. Simulation results verify the effectiveness of the parameter design. Secondly, damping strategy and current tracking strategy of LCL filter are studied. Aiming at the effect of delay in digital control system on active damping strategy, the active damping method of capacitive current instant feedback is presented. By reducing the delay of capacitance current feedback to 0.5 beats, the stability of the system is improved. In order to improve the harmonic suppression ability of the device, a compound control strategy of Pi plus repetitive control is introduced in this paper. An improved control strategy is proposed to compensate for current distortion during load fluctuation. By comparing current tracking error with current tracking error before 1 / 6 cycle, the repetitive controller input is adjusted. Pi controller works alone when load fluctuates intensely, and repetitive controller is put into operation when load is stable. The simulation results show that the proposed control strategy is effective, and the delay time of the repetitive controller is reduced to 1 / 6 of the fundamental period, and the dynamic response speed is improved. Thirdly, the layered control strategy of DC side voltage under balanced condition is given. The capacitor voltage can be equalized by total voltage control, interphase voltage control and intra-phase voltage control. In this paper, the zero-sequence voltage injection method is used to realize the equalization control of the interphase voltage, and the codirectional carrier stacked modulation is used to solve the problem of the unbalance of the capacitance voltage in the phase. The modulating wave of each module is adjusted in real time according to the capacitance voltage and the current charge and discharge state to maintain the stability of the voltage in the phase. Simulation results verify the effectiveness of the control strategy. Finally, the control strategy of STATCOM under unbalanced load condition is given. Aiming at the control target of integrated compensation of positive and negative sequence reactive power and negative sequence current, the mathematical model of positive and negative sequence of the device is established by symmetrical component method, and the current tracking is realized by positive and negative sequence double loop control, because STATCOM compensates negative sequence current, The three-phase DC side voltage can not be equalized. The zero-sequence voltage injection method is adopted to solve this problem, and the proportion of the injected zero-sequence voltage and the reactive and negative sequence current in the compensation current is deduced, and the output voltage of STATCOM is limited. When the zero sequence voltage is too large, the output voltage is overmodulated. On the basis of obtaining the compensation limit of negative sequence current, a control strategy to limit the negative sequence instruction current is given. The simulation results show that, The proposed control strategy can ensure the stability of the device and compensate the negative sequence current effectively when the load unbalance is large.
【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)】：TM761.12

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本文編號(hào)：1923421