本文選題：無(wú)功補(bǔ)償　切入點(diǎn)：配電網(wǎng)靜止同步補(bǔ)償器　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在電能質(zhì)量問(wèn)題越來(lái)越受關(guān)注的今天,電網(wǎng)的無(wú)功污染作為其中的重要組成部分已不容忽視。配電網(wǎng)靜止同步補(bǔ)償器(Distribution STATic synchronous COMpensator,D-STATCOM)是新一代無(wú)功補(bǔ)償裝置,能對(duì)配電網(wǎng)中的無(wú)功功率進(jìn)行有效補(bǔ)償,是無(wú)功補(bǔ)償領(lǐng)域的發(fā)展趨勢(shì)。而實(shí)際的配電網(wǎng)中,由于接入負(fù)載的變化,無(wú)功電流經(jīng)常發(fā)生變動(dòng),因此如何保證電網(wǎng)中的無(wú)功功率快速得到補(bǔ)償對(duì)維持電網(wǎng)線路安全可靠運(yùn)行具有重要的現(xiàn)實(shí)意義。本文針對(duì)快速補(bǔ)償無(wú)功的目標(biāo),在分析了現(xiàn)有的控制策略基礎(chǔ)上,基于三相兩電平電壓源型換流器拓?fù)浣Y(jié)構(gòu)的D-STATCOM系統(tǒng),提出了一種改進(jìn)的無(wú)差拍控制策略。首先,本文在兩相靜止坐標(biāo)系下建立了D-STATCOM的數(shù)學(xué)模型,推導(dǎo)出其無(wú)差拍形式,并進(jìn)行模型簡(jiǎn)化。在此基礎(chǔ)上,設(shè)計(jì)了無(wú)差拍控制器作為電流內(nèi)環(huán),PI控制器作為外環(huán)的控制結(jié)構(gòu),并分析了電流環(huán)的穩(wěn)定性,對(duì)無(wú)差拍控制器加以改進(jìn)。由于采樣、計(jì)算等數(shù)字系統(tǒng)固有的延時(shí)存在,對(duì)電網(wǎng)電壓、指令補(bǔ)償電流等變量做了提前兩拍的預(yù)測(cè),以實(shí)現(xiàn)真正的無(wú)差拍控制。無(wú)差拍控制是一種基于系統(tǒng)模型的控制方法,對(duì)系統(tǒng)參數(shù)變化敏感。對(duì)此,本文采用加權(quán)遞推最小二乘法對(duì)濾波電感參數(shù)進(jìn)行在線辨識(shí),以提高D-STATCOM無(wú)差拍控制系統(tǒng)的穩(wěn)定性。同時(shí),為了提高控制精度,本文設(shè)計(jì)了一種重復(fù)狀態(tài)預(yù)測(cè)器對(duì)下一拍的補(bǔ)償電流進(jìn)行預(yù)測(cè),并對(duì)整個(gè)電流環(huán)做了穩(wěn)定性分析。鑒于重復(fù)控制方法容易受電網(wǎng)頻率波動(dòng)的影響,本文提出了一種改進(jìn)的基于FIR數(shù)字濾波器的重復(fù)預(yù)測(cè)器,使其具備對(duì)電網(wǎng)頻率波動(dòng)的適應(yīng)性。在理論分析的基礎(chǔ)上,本文運(yùn)用Matlab/Simulink軟件對(duì)所提出的控制策略進(jìn)行了仿真分析。同時(shí),借助實(shí)驗(yàn)室的d SPACE半實(shí)物實(shí)驗(yàn)平臺(tái)進(jìn)一步開(kāi)展了實(shí)驗(yàn)驗(yàn)證。仿真和實(shí)驗(yàn)結(jié)果證明,采用本文提出的基于重復(fù)預(yù)測(cè)的無(wú)差拍控制策略的D-STATCOM裝置能快速補(bǔ)償負(fù)載無(wú)功,具有很好的穩(wěn)態(tài)性能和動(dòng)態(tài)性能。
[Abstract]:Nowadays, the problem of power quality has attracted more and more attention, and reactive power pollution is an important part of it. Distribution STATic synchronous compensatorD-STATCOMG is a new generation of reactive power compensator. It is a developing trend in the field of reactive power compensation to compensate reactive power effectively in distribution network. But in actual distribution network, reactive current often changes because of the change of connecting load. Therefore, how to ensure the rapid compensation of reactive power in the power network has an important practical significance for maintaining the safe and reliable operation of power lines. This paper analyzes the existing control strategies for the goal of rapid reactive power compensation. Based on the D-STATCOM system with three-phase two-level voltage source converter topology, an improved deadbeat control strategy is proposed. Firstly, the mathematical model of D-STATCOM is established in two-phase stationary coordinate system, and its non-beat form is deduced. On the basis of this, the control structure of the non-beat controller is designed as the current inner loop Pi controller as the outer loop, and the stability of the current loop is analyzed, and the non-beat controller is improved. In order to realize the true non-beat control, the time-delay of the digital system such as calculation is predicted two beats in advance for the variables such as the grid voltage and the command compensation current, which is a control method based on the system model. In order to improve the stability of D-STATCOM deadbeat control system, a weighted recursive least square method is used to identify the parameters of filter inductors on line. At the same time, in order to improve the control accuracy, In this paper, a repetitive state predictor is designed to predict the compensation current of the next beat, and the stability of the whole current loop is analyzed. In this paper, an improved repetitive predictor based on FIR digital filter is proposed to make it adaptive to the frequency fluctuation of power network. In this paper, the proposed control strategy is simulated and analyzed by using Matlab/Simulink software. At the same time, with the aid of the d SPACE hardware-in-the-loop experimental platform in the laboratory, further experimental verification is carried out. The simulation and experimental results prove that, The D-STATCOM device proposed in this paper based on repeated prediction deadbeat control strategy can compensate the load reactive power quickly and has good steady-state and dynamic performance.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM761.12

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本文編號(hào)：1625051