本文選題：微電網(wǎng)　切入點(diǎn)：模式切換　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：微電網(wǎng)的模式切換技術(shù)是微電網(wǎng)控制技術(shù)的關(guān)鍵組成部分。本文在分析模式切換技術(shù)在國(guó)內(nèi)外研究現(xiàn)狀的基礎(chǔ)上，針對(duì)主從控制策略切換難度大、參數(shù)跟蹤復(fù)雜和下垂控制策略動(dòng)態(tài)特性差、運(yùn)行點(diǎn)偏離的問(wèn)題，提出了一種可實(shí)現(xiàn)微電網(wǎng)模式平滑切換的新型主從控制策略。 這種策略可解決傳統(tǒng)主從控制在模式改變過(guò)程中功率自動(dòng)分配困難、參數(shù)跟蹤復(fù)雜和控制器需要切換的三個(gè)突出問(wèn)題。它采用多環(huán)反饋控制結(jié)構(gòu)，從外到內(nèi)依次為電壓頻率環(huán)、內(nèi)置參數(shù)環(huán)、電壓環(huán)和電流環(huán)。電壓頻率環(huán)具有下垂特性能實(shí)現(xiàn)功率的自動(dòng)配置；內(nèi)置參數(shù)環(huán)在模式切換時(shí)能實(shí)現(xiàn)參數(shù)的自動(dòng)跟蹤，不用再外接控制器；電壓環(huán)能跟蹤穩(wěn)態(tài)電壓；電流環(huán)能提高系統(tǒng)響應(yīng)速度。這種控制策略既適用于并網(wǎng)模式又適用于離網(wǎng)模式，模式切換時(shí)將不再需要切換控制器拓?fù)洹?為證實(shí)新型主從控制策略的可行性，本文設(shè)計(jì)了一個(gè)采用這種控制策略的微電網(wǎng)系統(tǒng)，，并對(duì)其進(jìn)行了穩(wěn)定性分析。穩(wěn)定性分析包括穩(wěn)態(tài)穩(wěn)定性分析和暫態(tài)穩(wěn)定性分析，又可稱為小信號(hào)穩(wěn)定性分析和暫穩(wěn)態(tài)穩(wěn)定性分析。其中的暫穩(wěn)態(tài)穩(wěn)定性主要指模式切換下的暫穩(wěn)態(tài)穩(wěn)定性。小信號(hào)穩(wěn)定性在系統(tǒng)整體數(shù)學(xué)模型基礎(chǔ)上，建立了狀態(tài)空間方程，發(fā)現(xiàn)其狀態(tài)矩陣的特征值均具有負(fù)實(shí)部，證實(shí)了采用這種控制策略的微電網(wǎng)系統(tǒng)是具有小信號(hào)穩(wěn)定性的，能在小擾動(dòng)下保持穩(wěn)定。暫穩(wěn)態(tài)穩(wěn)定性分析在系統(tǒng)仿真模型的基礎(chǔ)上，進(jìn)行了Matlab仿真，發(fā)現(xiàn)采用這種控制策略的微電網(wǎng)系統(tǒng)在正常工況下，模式切換的暫態(tài)消除時(shí)間均小于最大故障清除時(shí)間，證明了它是模式切換暫穩(wěn)態(tài)穩(wěn)定的，能抵抗模式切換這樣的大擾動(dòng)。 最后，和采用傳統(tǒng)主從控制策略、多環(huán)下垂控制策略的微電網(wǎng)系統(tǒng)進(jìn)行了模式切換效果的對(duì)比，再次證實(shí)了新型主從控制策略在模式切換時(shí)的優(yōu)越性。
[Abstract]:The mode switching technology of microgrid is a key component of microgrid control technology.Based on the analysis of the current research situation of mode switching technology at home and abroad, this paper aims at the difficulties of master-slave control strategy switching, the complexity of parameter tracking, the poor dynamic characteristics of droop control strategy, and the deviation of running point.A new master-slave control strategy which can realize smooth switching of microgrid mode is proposed.This strategy can solve the three outstanding problems of the traditional master-slave control, such as the difficulty of automatic power allocation, the complexity of parameter tracking and the switching of the controller.It adopts multi-loop feedback control structure. From outside to inside, it is a voltage frequency loop, a built-in parameter loop, a voltage loop and a current loop.The voltage frequency loop has sag characteristic to realize the automatic configuration of power; the built-in parameter loop can realize the automatic tracking of the parameters when the mode is switched without the external controller; the voltage loop can track the steady voltage; the current loop can improve the system response speed.This control strategy is suitable for both grid-connected and off-grid modes, and the switching controller topology will no longer be required for mode switching.In order to prove the feasibility of the new master-slave control strategy, a microgrid system using this control strategy is designed and its stability is analyzed.Stability analysis includes steady stability analysis and transient stability analysis, which can be called small signal stability analysis and transient stability analysis.The transient stability mainly refers to the transient stability under mode switching.On the basis of the whole mathematical model of the system, the state space equation is established, and the eigenvalues of the state matrix are found to have negative real parts. It is proved that the microgrid system using this control strategy has small signal stability.Can maintain stability under small disturbance.On the basis of system simulation model, the transient stability analysis of microgrid system with this control strategy is carried out by Matlab simulation. It is found that the transient elimination time of mode switching is less than the maximum fault removal time under normal working conditions.It is proved that it is stable in the transient state of mode switching and can resist the large disturbance of mode switching.Finally, compared with the traditional master-slave control strategy and multi-loop droop control strategy, the effect of mode switching is compared, and the superiority of the new master-slave control strategy in mode switching is proved again.
【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】：2014
【分類(lèi)號(hào)】：TM73

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