本文關(guān)鍵詞： 鏈?zhǔn)絊TATCOM 直流側(cè)電壓不平衡 無功補(bǔ)償 三相不平衡　出處：《濟(jì)南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：鏈?zhǔn)降撵o止同步補(bǔ)償器（Static Synchronous Compensator，STATCOM）在大功率高電壓無功補(bǔ)償方面具有良好的動(dòng)態(tài)特性，具有模塊化、多電平、可靠性高、易于擴(kuò)展等優(yōu)點(diǎn)，得到了人們的廣泛關(guān)注。本文針對(duì)鏈?zhǔn)絊TATCOM相關(guān)技術(shù)進(jìn)行研究，討論了鏈?zhǔn)絊TATCOM的建模與控制，無功電流的檢測(cè)以及直流側(cè)電壓的控制等問題，具體研究?jī)?nèi)容包括以下幾個(gè)方面： 介紹了STATCOM的基本工作原理。建立了鏈?zhǔn)絊TATCOM在三相靜止坐標(biāo)系下以開關(guān)函數(shù)描述的數(shù)學(xué)模型。為便于控制器的設(shè)計(jì)，建立了鏈?zhǔn)絊TATCOM的低頻動(dòng)態(tài)模型。利用坐標(biāo)變換，得到了鏈?zhǔn)絊TATCOM在d q旋轉(zhuǎn)坐標(biāo)系下的頻域等效模型，同時(shí)考慮了系統(tǒng)不平衡時(shí)的影響。 對(duì)鏈?zhǔn)絊TATCOM在頻域下的等效模型進(jìn)行分析，，得到鏈?zhǔn)絊TATCOM是一個(gè)強(qiáng)耦合非線性系統(tǒng)。采用前饋解耦的內(nèi)環(huán)電流控制策略實(shí)現(xiàn)了有功電流和無功電流的有效分離。對(duì)于功率外環(huán)，采用PI控制器得到鏈?zhǔn)絊TATCOM的電流參考值�；诖嗽O(shè)計(jì)了鏈?zhǔn)絊TATCOM的控制器。此外，在設(shè)計(jì)過程中考慮了系統(tǒng)不平衡時(shí)鏈?zhǔn)絊TATCOM的控制問題。 對(duì)兩種基本檢測(cè)方法：p q法和ip iq法檢測(cè)諧波電流和無功電流的原理進(jìn)行簡(jiǎn)單闡述。分析了傳統(tǒng)三相鎖相環(huán)在系統(tǒng)電壓出現(xiàn)畸變和不平衡時(shí)不能實(shí)時(shí)準(zhǔn)確的鎖相，利用相序解耦諧振（Sequence-Decoupled Resonant，SDR）控制器對(duì)傳統(tǒng)的鎖相環(huán)進(jìn)行改進(jìn)，得到一種采用SDR鎖相環(huán)的ip iq無功電流檢測(cè)方法。 分析了引起鏈?zhǔn)絊TATCOM的直流側(cè)壓不平衡的原因。從鏈?zhǔn)絊TATCOM裝置的功率平衡入手，對(duì)系統(tǒng)進(jìn)行正負(fù)序分析，得出正序電流影響系統(tǒng)的總體電壓平衡，負(fù)序電流影響各相間的電壓平衡。對(duì)傳統(tǒng)的三級(jí)直流側(cè)電壓控制算法進(jìn)行改進(jìn)，得到一種新的三級(jí)直流側(cè)電容電壓平衡控制方法：第一級(jí)控制采用正序電流控制鏈?zhǔn)絊TATCOM的總體電壓平衡；第二級(jí)采用負(fù)序電流控制實(shí)現(xiàn)鏈?zhǔn)絊TATCOM各相間的電壓平衡；第三級(jí)針對(duì)相內(nèi)各個(gè)單相逆變橋（H-Bridge Inverter，HBI）模塊的電容電壓平衡問題，通過在鏈節(jié)輸出無功電流的基礎(chǔ)上添加一個(gè)純有功矢量，實(shí)現(xiàn)HBI模塊的電壓平衡。采用MATLAB/SIMULINK搭建了鏈節(jié)數(shù)為10級(jí)的仿真模型，仿真表明這種新型三級(jí)控制策略能有效實(shí)現(xiàn)鏈?zhǔn)絊TATCOM直流側(cè)電壓的平衡。
[Abstract]:The chain static Synchronous compensator has good dynamic characteristics in high-power and high-voltage reactive power compensation, and has the advantages of modularization, multilevel, high reliability and easy expansion. In this paper, the modeling and control of chain STATCOM, the detection of reactive current and the control of DC voltage are discussed. The specific research contents include the following aspects:. The basic working principle of STATCOM is introduced. The mathematical model of chain STATCOM described by switch function in three-phase static coordinate system is established. In order to facilitate the design of controller, the low frequency dynamic model of chain type STATCOM is established. The frequency domain equivalent model of chain STATCOM in d Q rotating coordinate system is obtained, and the influence of system unbalance is considered. By analyzing the equivalent model of chain STATCOM in frequency domain, it is concluded that chain STATCOM is a strongly coupled nonlinear system. The active current and reactive current are effectively separated by feedforward decoupling inner loop current control strategy. The current reference value of chain STATCOM is obtained by using Pi controller. Based on this, the controller of chain STATCOM is designed. In addition, the control problem of chain STATCOM when the system is unbalanced is considered in the design process. The principle of detecting harmonic current and reactive current by two basic detection methods:: PQ method and iq method are simply expounded. The traditional three-phase phase-locked loop can not be accurately locked in real time when the system voltage is distorted and unbalanced. The phase sequence decoupling resonant Sequence-Decouped Resonant (SDR) controller is used to improve the traditional PLL, and a SDR PLL is used to detect the reactive current of iq. This paper analyzes the causes of unbalance of DC side voltage of chain type STATCOM. Starting from the power balance of chain type STATCOM device, the positive and negative sequence analysis of the system is carried out, and the positive sequence current affects the overall voltage balance of the system. The negative sequence current affects the voltage balance between phases. The traditional three-stage DC side voltage control algorithm is improved. A new three-stage DC side capacitor voltage balance control method is presented. The first stage control adopts positive sequence current to control the total voltage balance of chain type STATCOM, the second stage adopts negative sequence current control to realize the voltage balance between each phase of chain type STATCOM, and the second stage adopts negative sequence current control to realize the voltage balance between each phase of the chain type STATCOM. In the third stage, aiming at the capacitor voltage balance problem of the H-Bridge Inverter HBI module, a pure active power vector is added on the basis of the reactive current output from the link. The voltage balance of HBI module is realized. A simulation model with 10 levels of chain nodes is built by using MATLAB/SIMULINK. The simulation results show that this new three-level control strategy can effectively balance the DC side voltage of chain STATCOM.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM761.12

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