【摘要】：由于環(huán)境污染以及能源危機問題的日益加重,基于清潔可再生能源的分布式發(fā)電技術(shù)得到了快速發(fā)展,為了能夠更好的消納分布式電源的出力以及穩(wěn)定電網(wǎng)的正常運行,微網(wǎng)技術(shù)得到了不斷的發(fā)展。微電網(wǎng)中的微源大多是通過電力電子逆變器實現(xiàn)與大電網(wǎng)的并聯(lián)運行,在受到擾動或故障情況下,對于基于逆變器接口的分布式電源而言,其動態(tài)響應(yīng)速度快,幾乎沒有慣性,無法像傳統(tǒng)同步發(fā)電機一樣利用旋轉(zhuǎn)部件的旋轉(zhuǎn)慣性來抑制功率或頻率的波動,在孤島運行時難以為電網(wǎng)提供電壓及頻率支撐作用。同時,對于冗余配置的并聯(lián)逆變器機組間,由于電路參數(shù)或者開關(guān)元件動作不完全一致等因素,將會在并聯(lián)機組之間出現(xiàn)環(huán)流,對于環(huán)流抑制問題也有待解決�；谝陨蠁栴},本文的主要研究內(nèi)容如下:首先,對虛擬同步發(fā)電機進行了拓?fù)浞治?將三階同步發(fā)電機模型的電氣方程以及轉(zhuǎn)子運動方程引入到逆變器的控制策略中,建立了虛擬同步發(fā)電機模型,并引入了虛擬慣性、虛擬阻尼參數(shù),通過仿真分析,得出了阻尼及慣性兩個虛擬參數(shù)對于系統(tǒng)運行穩(wěn)定性的影響。其次,基于傳統(tǒng)同步發(fā)電機的運行特性分析,設(shè)計了虛擬同步發(fā)電機并網(wǎng)運行時的頻率控制策略及電壓控制策略,實現(xiàn)了單臺虛擬同步發(fā)電機的調(diào)頻以及調(diào)壓功能。在電壓控制中,總結(jié)了現(xiàn)有的基于無功-電壓下垂特性所設(shè)計的電壓控制策略,同時考慮同步發(fā)電機勵磁特性,提出一種基于虛擬勵磁控制系統(tǒng)的電壓控制策略,最后通過仿真驗證了所設(shè)計的控制策略的控制性能。最后,分析了虛擬同步發(fā)電機雙機并聯(lián)運行時環(huán)流的產(chǎn)生機理及環(huán)流的物理含義,設(shè)計了電壓差值反饋的雙機環(huán)流抑制策略,并對兩種電壓控制策略下的并聯(lián)系統(tǒng)進行環(huán)流抑制仿真實驗,驗證了所設(shè)計的環(huán)流抑制策略的有效性。
[Abstract]:Due to the increasing environmental pollution and energy crisis, distributed power generation technology based on clean and renewable energy has been developed rapidly. In order to better absorb the output of distributed power and stabilize the normal operation of the power grid, Microgrid technology has been continuously developed. Most of the micro sources in microgrid are operated in parallel with large power grid through power electronic inverter. In the case of disturbance or fault, the dynamic response speed of distributed power supply based on inverter interface is fast and there is almost no inertia. The rotating inertia of rotating parts can not be used to restrain the fluctuation of power or frequency like the traditional synchronous generator, and it is difficult to provide voltage and frequency support for the grid when the island is running. At the same time, for redundant parallel inverter units, due to the circuit parameters or switching elements are not completely consistent, there will be circulation between parallel units, and the problem of circulation suppression needs to be solved. Based on the above problems, the main research contents of this paper are as follows: firstly, the topology analysis of the virtual synchronous generator is carried out, and the electrical equation of the third-order synchronous generator model and the rotor motion equation are introduced into the control strategy of the inverter. The virtual synchronous generator model is established, and the virtual inertia and virtual damping parameters are introduced. Through the simulation analysis, the influence of the two virtual parameters, damping and inertia, on the stability of the system is obtained. Secondly, based on the analysis of the operation characteristics of the traditional synchronous generator, the frequency control strategy and voltage control strategy of the virtual synchronous generator when connected to the grid are designed, and the frequency modulation and voltage regulation functions of the single virtual synchronous generator are realized. In voltage control, the existing voltage control strategies based on reactive power-voltage droop characteristics are summarized. Considering the excitation characteristics of synchronous generators, a voltage control strategy based on virtual excitation control system is proposed. Finally, the control performance of the designed control strategy is verified by simulation. Finally, the mechanism of circulation and the physical meaning of circulation in parallel operation of virtual synchronous generator are analyzed, and the suppression strategy of dual-machine circulation based on voltage difference feedback is designed. Simulation experiments are carried out for the parallel systems under two voltage control strategies to verify the effectiveness of the designed loop suppression strategy.
【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】：TM31

【參考文獻】

相關(guān)期刊論文 前10條

1 張貞艷;高磊;張錦;;并聯(lián)無隔離光伏并網(wǎng)逆變器漏電流和環(huán)流抑制研究[J];電氣傳動;2016年11期

2 李國武;梁吉;許健;吳恒;唐瑩瑩;;適用于不同等效阻抗的并聯(lián)逆變器環(huán)流抑制方法研究[J];電子設(shè)計工程;2016年19期

3 程遠;邵文權(quán);黃晶晶;;二重化并網(wǎng)變流器的控制及環(huán)流抑制研究[J];電力電子技術(shù);2016年08期

4 莊慧敏;巨輝;肖建;;高滲透率逆變型分布式發(fā)電對電力系統(tǒng)暫態(tài)穩(wěn)定和電壓穩(wěn)定的影響[J];電力系統(tǒng)保護與控制;2014年17期

5 陸志剛;王科;董旭柱;李達;李登武;;分布式發(fā)電對配電網(wǎng)影響分析[J];電力系統(tǒng)及其自動化學(xué)報;2012年06期

6 張興;朱德斌;徐海珍;;分布式發(fā)電中的虛擬同步發(fā)電機技術(shù)[J];電源學(xué)報;2012年03期

7 季陽;艾芊;解大;;分布式發(fā)電技術(shù)與智能電網(wǎng)技術(shù)的協(xié)同發(fā)展趨勢[J];電網(wǎng)技術(shù);2010年12期

8 陳達威;朱桂萍;;低壓微電網(wǎng)中的功率傳輸特性[J];電工技術(shù)學(xué)報;2010年07期

9 王文軍;湯鈺鵬;張曄;;逆變器并聯(lián)運行的環(huán)流反饋控制[J];電力系統(tǒng)保護與控制;2009年17期

10 Bartosz Wojszczyk;Omar Al-Juburi;王靖;;分布式發(fā)電的高覆蓋率對電力系統(tǒng)設(shè)計和運行的影響分析(英文)[J];電網(wǎng)技術(shù);2009年15期

相關(guān)博士學(xué)位論文 前1條

1 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

相關(guān)碩士學(xué)位論文 前3條

1 王雅婷;分布式電源接入對配電網(wǎng)保護的影響及新方案研究[D];北京交通大學(xué);2013年

2 鄭曉明;微網(wǎng)逆變器虛擬同步發(fā)電機控制策略的分析與驗證[D];燕山大學(xué);2013年

3 張中鋒;微網(wǎng)逆變器的下垂控制策略研究[D];南京航空航天大學(xué);2013年

，

本文編號：2447427