本文關(guān)鍵詞：考慮儲能系統(tǒng)的虛擬同步發(fā)電機研究　出處：《濟南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 分布式發(fā)電 虛擬同步發(fā)電機(VSG) 儲能系統(tǒng) 協(xié)調(diào)控制

【摘要】：隨著分布式電源技術(shù)的發(fā)展,大量的新能源分布式電源接入電網(wǎng)。但是分布式電源所采用的并網(wǎng)技術(shù)一般比較落后,大多采用電壓鎖相環(huán)或最大功率跟蹤等并網(wǎng)方式。這些傳統(tǒng)方法并入電網(wǎng)的功率極有可能是垃圾功率。分布式電源系統(tǒng)功率的單向流動性以及高頻特性,在電網(wǎng)中分布式電源滲透水平較高或者是同步發(fā)電機缺失的條件下,會使整個電網(wǎng)系統(tǒng)慣性缺失,最終會導(dǎo)致電網(wǎng)系統(tǒng)難以抵御電力系統(tǒng)中常見的高頻干擾,從而使系統(tǒng)穩(wěn)定性降低。本文在充分了解同步發(fā)電機并網(wǎng)原理的基礎(chǔ)上,掌握了逆變器向同步發(fā)電機等效過程。重點研究虛擬同步發(fā)電機(Virtual Synchronous Generator,VSG)算法的機電方程,分析其具體工程實現(xiàn)方法。繪制算法實現(xiàn)框圖,并通過仿真的手段驗證建模的有效性以及實現(xiàn)的可行性。并參照同步發(fā)電機的控制原理,研究設(shè)計相應(yīng)的功頻控制器和勵磁電壓控制器。并設(shè)計了一種通過改變機械功率輸入而調(diào)節(jié)逆變器輸出電壓相位的預(yù)并列控制單元,能夠在不進行變壓器隔離的情況下,實現(xiàn)變流器快速平滑的并網(wǎng)。研究了鉛酸蓄電池的充放電特性,并確定蓄電池單元的建模方法。在此基礎(chǔ)上選擇合適的雙向DC-DC電路,用于實現(xiàn)逆變器直流側(cè)與儲能電池間雙向快速的功率流動。通過充分考慮儲能系統(tǒng)的特性,以及充放電深度對鉛酸蓄電池壽命的影響,提出了一種既能保證系統(tǒng)并網(wǎng)后對電網(wǎng)頻率和電壓的有效調(diào)控,又能有效的保護蓄電池的協(xié)調(diào)控制策略,使其能夠滿足運行的經(jīng)濟性。為了更加充分地說明控制策略的優(yōu)越性,建立了蓄電池的壽命損耗模型,把蓄電池運行過程的壽命消耗進行量化。本文通過對虛擬同步發(fā)電機的傳統(tǒng)功頻下垂控制器進行改進,設(shè)計得到一種變下垂系數(shù)的虛擬同步發(fā)電機功頻控制器。其以電池的實時荷電狀態(tài)(State of Charge,SOC)和運行工況作為輸入量,在虛擬同步發(fā)電機系統(tǒng)并網(wǎng)運行的過程中,動態(tài)地調(diào)整功頻控制器的下垂系數(shù),從而間接控制系統(tǒng)出力。改進后的變下垂系數(shù)控制方法能夠在蓄電池即將過充或過放的情況下,對系統(tǒng)并網(wǎng)出力進行調(diào)整,最終能夠有效抑制過充和過放的發(fā)生。本文充分考慮蓄電池側(cè)儲能系統(tǒng)的設(shè)計,將儲能側(cè)的相關(guān)特性與逆變器側(cè)的逆變并網(wǎng)有效的結(jié)合起來,而不是像之前虛擬同步發(fā)電機的相關(guān)研究一樣,將直流側(cè)忽略或者理想化。整個系統(tǒng)適用性強,非常有利于工程實現(xiàn)。在上述工作的基礎(chǔ)上,利用Matlab/Simulink進行系統(tǒng)仿真,構(gòu)造了整個虛擬同步發(fā)電機并網(wǎng)系統(tǒng)的仿真模型,驗證了本文所構(gòu)造系統(tǒng)各部分的性能。仿真結(jié)果表明,其能夠在滿足運行經(jīng)濟性的前提下,有效地參與微電網(wǎng)電壓和頻率的智能調(diào)控。
[Abstract]:With the development of distributed generation technology, new energy and distributed power grid. But a large number of distributed power grid technology used in general is relatively backward, mostly adopts voltage PLL or MPPT and grid method. The traditional method of power grid is likely to be a garbage power. The unidirectional flow and high frequency characteristics of power distributed power the system in the power grid, distributed power penetration level is higher or the synchronous generator under the condition of the absence of, will make the whole power system inertia will eventually lead to lack of high frequency interference grid system is difficult to resist the power system in common, so that the stability of the system is reduced. This paper based on a full understanding of the principle of synchronous generator grid on the master the inverter equivalent to the synchronous generator. The process focuses on the virtual synchronous generator (Virtual Synchronous Generator, V SG) electromechanical equation algorithm, realization method of analysis of the specific project. Rendering algorithm flowchart, and by means of simulation verify the validity of the modeling and the feasibility of realizing control principle. And in the light of the synchronous generator, the design of the corresponding power frequency excitation controller and voltage controller. Research and design a regulated output voltage of inverter by changing the phase of mechanical power input pre parallel control unit can not be in the transformer isolated condition, realize grid connected converter fast and smooth. The charge discharge characteristics of lead-acid battery, and determine the modeling method of battery unit. Based on the bi-directional DC-DC circuit suitable for the realization of the inverter DC side, and storage battery power bidirectional fast flow. By considering the characteristics of energy storage system, and the depth of the charge and discharge of lead-acid battery life. Ring, to design a effective regulation to ensure the system integration on the grid frequency and voltage, and can effectively protect the battery of the coordinated control strategy, which can meet the economic operation. In order to fully illustrate the superiority of the control strategy, establish the life loss model of the battery, the battery operation process the life consumption was quantified. This paper was improved by traditional power frequency droop controller of virtual synchronous generator, the design of a variable coefficient virtual synchronous generator power frequency controller. The battery state of charge in real time (State of Charge, SOC) and operating conditions as input, in the process of the integrated operation of virtual synchronization the generator system, thecoefficient dynamically adjust the power frequency controller, thereby indirectly control the system output control variable. The improved method can droop coefficient in the battery is The overcharge or overdischarge conditions of grid connected output regulation, finally can effectively inhibit the overcharge and overdischarge. Considering the side design of battery energy storage system, the storage characteristics of inverter side and inverter side are effectively combined, and related research is not like before virtual synchronous generator, the DC side will be ignored or idealized. The whole system has strong applicability, is very conducive to the realization of the project. Based on the above work, the system simulation by Matlab/Simulink, constructed a simulation model of the virtual synchronous generator grid system, to verify the structural performance of each part of the system simulation. The results show that it can meet the premise of economic operation under the intelligent control to effectively participate in the micro grid voltage and frequency.

【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM31

【參考文獻】

相關(guān)博士學(xué)位論文 前2條

1 盤宏斌;綜合型電能質(zhì)量調(diào)節(jié)裝置的理論與技術(shù)研究[D];湖南大學(xué);2009年

2 楊向真;微網(wǎng)逆變器及其協(xié)調(diào)控制策略研究[D];合肥工業(yè)大學(xué);2011年

，

本文編號：1367419