【摘要】：隨著能源和環(huán)境問題的日益嚴(yán)重,新能源發(fā)電受到了世界各國的廣泛關(guān)注,但是風(fēng)力發(fā)電等間歇性電源的接入也對電網(wǎng)的電能質(zhì)量造成了影響。為了提高可再生能源發(fā)電的穩(wěn)定性,改善電網(wǎng)的電能質(zhì)量,電池儲能系統(tǒng)得到了廣泛應(yīng)用。儲能系統(tǒng)的核心是逆變器,研究儲能系統(tǒng)逆變器的控制機(jī)理和在不同工況下儲能系統(tǒng)的各種控制策略具有深遠(yuǎn)的理論和現(xiàn)實意義。中國電科院項目《儲能系統(tǒng)并離網(wǎng)特性及檢測技術(shù)》進(jìn)行儲能系統(tǒng)的并離網(wǎng)特性檢測平臺的建設(shè),基于該項目,本論文對儲能系統(tǒng)并離網(wǎng)切換特性展開研究。首先,建立了電壓型逆變器在不同坐標(biāo)系下的數(shù)學(xué)模型,研究儲能逆變器雙閉環(huán)控制策略,并分析了儲能系統(tǒng)并網(wǎng)及離網(wǎng)運行時的不同控制策略。其次,根據(jù)儲能系統(tǒng)在三相電壓平衡時的并網(wǎng)和離網(wǎng)運行特性,分析了儲能系統(tǒng)并離網(wǎng)切換時的控制原理,設(shè)計了基于PI雙閉環(huán)控制的平滑切換控制策略,通過仿真,分析了儲能系統(tǒng)并離網(wǎng)切換特性。再次,針對電網(wǎng)三相電壓不平衡的工況,設(shè)計了在電網(wǎng)電壓不平衡下儲能系統(tǒng)并離網(wǎng)切換控制策略,并網(wǎng)轉(zhuǎn)離網(wǎng)時,在切換前以抑制有功功率二次波動為控制目標(biāo),切換時采用系統(tǒng)正負(fù)序電壓協(xié)作調(diào)節(jié)的控制方法;準(zhǔn)同期并網(wǎng)時正負(fù)序電壓外環(huán)共同調(diào)節(jié),使逆變器輸出電壓與電網(wǎng)電壓同步,從而實現(xiàn)電網(wǎng)電壓不平衡下儲能系統(tǒng)并離網(wǎng)切換的平滑過渡,并通過仿真驗證算法的可行性。最后,在電流內(nèi)環(huán)控制的基礎(chǔ)上,提出了一種新型的電壓漂移孤島檢測方法。通過在電流內(nèi)環(huán)中添加反饋電壓增益模塊來提高檢測效率,并利用古爾維茨判據(jù)對模塊中的增益系數(shù)進(jìn)行分析來研究孤島檢測成功邊界條件;為防止逆變器輸出功率與負(fù)荷功率完全相等而無法檢測出孤島的問題,提出在并網(wǎng)運行時逆變器輸出功率時刻存在較小波動的方法,通過仿真驗證了其有效性。
[Abstract]:With the increasingly serious energy and environmental problems, new energy generation has received extensive attention in the world. However, the access of intermittent power sources such as wind power also has an impact on the power quality of the power grid. In order to improve the stability of renewable energy generation and improve the power quality of power grid, battery energy storage system has been widely used. The inverter is the core of the energy storage system. It is of great theoretical and practical significance to study the control mechanism of the inverter and the various control strategies of the energy storage system under different operating conditions. Based on the project of "Energy storage system and off-grid characteristics and detection technology", a platform for detecting energy storage system's off-grid characteristics is constructed. Based on this project, this paper studies the characteristics of energy storage system and off-grid switching. Firstly, the mathematical models of the voltage source inverter in different coordinate systems are established, and the dual closed loop control strategies of the energy storage inverter are studied, and the different control strategies of the energy storage system when connected to and off the grid are analyzed. Secondly, according to the characteristics of grid-connected and off-grid operation of energy storage system under three-phase voltage balance, the control principle of energy storage system and off-grid switching is analyzed, and a smooth switching control strategy based on PI double closed-loop control is designed. The switching characteristics of energy storage system and off-grid are analyzed. Thirdly, aiming at the condition of unbalanced three-phase voltage, the control strategy of energy storage system and off-grid switching is designed under the condition of unbalanced grid voltage. Before switching, the control target is to restrain the secondary fluctuation of active power. When switching, the control method of positive and negative sequence voltage cooperative regulation is adopted, and the positive and negative sequence voltage outer loop is jointly adjusted in quasi-synchronous grid-connection to synchronize the output voltage of the inverter with the grid voltage. Thus, the smooth transition of energy storage system and off-grid switching is realized under unbalanced grid voltage, and the feasibility of the algorithm is verified by simulation. Finally, on the basis of current inner loop control, a new detection method of voltage drift island is proposed. In order to improve the detection efficiency, the feedback voltage gain module is added to the inner loop of current to improve the detection efficiency, and the Gourwitz criterion is used to analyze the gain coefficient in the module to study the boundary conditions for the successful detection of isolated islands. In order to avoid the problem that the output power of the inverter is equal to the load power and the isolated island can not be detected, a method of small fluctuation of the output power of the inverter in grid-connected operation is proposed, and the effectiveness of the method is verified by simulation.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464;TM614

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 郝新星;蘇建徽;施永;徐海波;;基于虛擬同步機(jī)的微網(wǎng)并離網(wǎng)切換策略研究[J];電氣傳動;2016年01期

2 張偉;張繼元;王浩;舒杰;丁建寧;;電網(wǎng)正、負(fù)序電壓基波分量的提取算法在并網(wǎng)型逆變器控制中的應(yīng)用[J];新能源進(jìn)展;2015年05期

3 郭權(quán)利;苑舜;周春陽;王昊;王雪杰;;基于模糊控制的微網(wǎng)平滑切換控制策略的研究[J];高電壓技術(shù);2015年10期

4 時珊珊;陳常曦;于文杰;劉舒;;一種雙模式的儲能變流器樣機(jī)研制[J];電力與能源;2015年02期

5 吳盛軍;徐青山;袁曉冬;李強(qiáng);柳丹;;光伏防孤島保護(hù)檢測標(biāo)準(zhǔn)及試驗影響因素分析[J];電網(wǎng)技術(shù);2015年04期

6 閆濤;渠展展;劉峗甲;惠東;小林真一;張學(xué)龍;;新型中點鉗位三電平電池儲能變流器設(shè)計及控制系統(tǒng)[J];電力系統(tǒng)自動化;2015年03期

7 崇志強(qiáng);戴志輝;焦彥軍;;基于負(fù)序電流注入的光伏并網(wǎng)逆變器孤島檢測方法[J];電力系統(tǒng)保護(hù)與控制;2014年24期

8 鄭濤;袁飛;王燕萍;王增平;劉逸辰;黃雯;王小立;;基于模糊控制的快速無盲區(qū)的頻移式孤島檢測法[J];電力系統(tǒng)保護(hù)與控制;2014年23期

9 李澤斌;羅安;田園;劉奇;謝龍裕;徐千鳴;;LCL型光伏并網(wǎng)逆變器電流內(nèi)環(huán)控制方法[J];電網(wǎng)技術(shù);2014年10期

10 呂志鵬;盛萬興;鐘慶昌;劉海濤;曾正;楊亮;劉嵐;;虛擬同步發(fā)電機(jī)及其在微電網(wǎng)中的應(yīng)用[J];中國電機(jī)工程學(xué)報;2014年16期

相關(guān)碩士學(xué)位論文 前6條

1 張武;微網(wǎng)逆變器雙模式平滑切換的控制策略研究[D];安徽理工大學(xué);2015年

2 高鵬;微電網(wǎng)平滑切換控制及孤島檢測方法研究[D];西南交通大學(xué);2014年

3 吳思哲;微電網(wǎng)變流器控制技術(shù)研究[D];北京交通大學(xué);2012年

4 王曉東;雙向PWM整流器設(shè)計與研究[D];武漢理工大學(xué);2007年

5 尚小寶;基于空間電壓矢量控制高功率因數(shù)整流器的研究[D];西安理工大學(xué);2006年

6 薛超;PWM整流器控制系統(tǒng)的研究[D];哈爾濱工程大學(xué);2006年

，

本文編號：2229846