本文選題：光儲混合系統(tǒng) + 孤網(wǎng)��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：在化石能源日益枯竭的今天,太陽能發(fā)電作為一種可再生的發(fā)電形式受到越來越多的重視。太陽能輻射的隨機(jī)性和波動性,導(dǎo)致輸出功率波動,會對具有高滲透率的孤立發(fā)電系統(tǒng)的電壓和頻率產(chǎn)生不利影響,導(dǎo)致了光伏發(fā)電系統(tǒng)輸出的不可控,這成為影響光伏滲透率提高的重要因素。將光電與儲能結(jié)合構(gòu)成光儲混合系統(tǒng)是解決出現(xiàn)問題的方式之一,尤其是在邊遠(yuǎn)山區(qū)或海島。應(yīng)用儲能技術(shù)被認(rèn)為可以有效改善光伏發(fā)電系統(tǒng)的可控性。 以光伏發(fā)電與鋰電池系統(tǒng)組成的光儲混合系統(tǒng)為研究對象,采用含線性補(bǔ)償環(huán)的電壓-頻率控制與改進(jìn)型下垂控制對混合系統(tǒng)孤網(wǎng)穩(wěn)定問題進(jìn)行研究。建立了光伏發(fā)電系統(tǒng)、鋰電池系統(tǒng)(BESS)模型,確定光儲混合系統(tǒng)拓?fù)浣Y(jié)構(gòu)。論文從儲能控制策略對混合系統(tǒng)孤網(wǎng)穩(wěn)定問題進(jìn)行分析,BESS因其具有快速響應(yīng)光電及負(fù)載動態(tài)變化的特性,故可作為類似大電網(wǎng)的“平衡節(jié)點”來維持系統(tǒng)電壓和頻率穩(wěn)定。BESS不僅可建立電壓和頻率,而且可用于平滑光電與負(fù)載間的系統(tǒng)功率差以實現(xiàn)系統(tǒng)功率平衡,進(jìn)而維持電壓和頻率的穩(wěn)定,負(fù)荷功率分配控制采用基于電池系統(tǒng)荷電狀態(tài)的改進(jìn)型功率下垂控制策略,因采用傳統(tǒng)下垂控制策略而導(dǎo)致系統(tǒng)達(dá)到新的穩(wěn)定狀態(tài)后產(chǎn)生的公共母線電壓和頻率誤差,論文采用含線性補(bǔ)償環(huán)的電壓-頻率(V/f)控制,使交流母線電壓和頻率更加穩(wěn)定。 在MATLAB/SIMULINK軟件環(huán)境中建立電池系統(tǒng)荷電狀態(tài)改進(jìn)型下垂控制和含線性補(bǔ)償環(huán)的V/f控制仿真模型并對其分析,驗證了控制策略在穩(wěn)定公共母線電壓和頻率穩(wěn)定、負(fù)荷功率分配的正確性與有效性,表明混合系統(tǒng)孤網(wǎng)下能夠穩(wěn)定、可靠運(yùn)行。圖25幅,表4個,參考文獻(xiàn)61篇。
[Abstract]:Absrtact: with the increasingly exhausted fossil energy, solar power generation as a renewable form of power generation has received more and more attention. The randomness and fluctuation of solar radiation lead to the fluctuation of output power, which will adversely affect the voltage and frequency of the isolated power generation system with high permeability, and lead to the uncontrollable output of photovoltaic power system. This has become an important factor affecting the increase of photovoltaic permeability. The combination of photoelectricity and energy storage is one of the ways to solve the problems, especially in remote mountain areas or islands. The application of energy storage technology is considered to be effective in improving the controllability of photovoltaic power generation systems. Based on the hybrid system of photovoltaic generation and lithium battery, the stability of the hybrid system is studied by using the voltage-frequency control with linear compensation loop and the improved droop control. The model of photovoltaic system and lithium battery system is established, and the topology of hybrid optical storage system is determined. Based on the energy storage control strategy, this paper analyzes the stability problem of hybrid system isolated network because of its characteristics of fast response to photoelectricity and dynamic change of load. Therefore, it can be used as a "balanced node" similar to large power grid to maintain system voltage and frequency stability. BESS not only can establish voltage and frequency, but also can be used to smooth the system power difference between photoelectricity and load to realize system power balance. In order to maintain the stability of voltage and frequency, the load power distribution control adopts an improved power droop control strategy based on the charging state of the battery system. Because of the common bus voltage and frequency error caused by the traditional droop control strategy, the AC bus voltage and frequency are more stable by using the voltage-frequency V / F control with linear compensation loop. In the MATLAB / Simulink software environment, the simulation models of the improved droop control and the V / F control with linear compensation loop are established and analyzed. It is verified that the control strategy is stable in the common bus voltage and frequency. The correctness and effectiveness of load power distribution show that the hybrid system can operate stably and reliably. 25 figures, 4 tables, 61 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615

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