基于能量函數(shù)法的含VSG-IIDG電力系統(tǒng)暫態(tài)穩(wěn)定分析
焦永輝1,卜京1,張寧宇2,周前2,汪成根2,劉建坤2
(1 南京理工大學(xué) 自動(dòng)化學(xué)院,江蘇 南京 210094;2 國(guó)網(wǎng)江蘇省電力公司電力科學(xué)研究院,江蘇 南京 211100)
摘 要:采用虛擬同步發(fā)電機(jī)(VSG)策略的電壓源逆變型分布式電源(IIDG)的暫態(tài)特性與同步發(fā)電機(jī)類似,而其電流飽和環(huán)節(jié)使其暫態(tài)特性又有別于同步發(fā)電機(jī),使系統(tǒng)暫態(tài)穩(wěn)定分析變得更加復(fù)雜?;谀芰亢瘮?shù)法提出了一種計(jì)及VSG-IIDG電力系統(tǒng)的暫態(tài)能量函數(shù)。通過(guò)分析暫態(tài)過(guò)程中逆變器的暫態(tài)特性,以此構(gòu)建其虛擬功角模型,并分析了電流飽和環(huán)節(jié)對(duì)能量函數(shù)的影響,基于此,采用輸出功率擬合方法構(gòu)建了計(jì)及VSG-IIDG的系統(tǒng)暫態(tài)能量函數(shù)。利用MATLAB/Simulink進(jìn)行了仿真,驗(yàn)證了該方法的有效性。
關(guān)鍵詞:虛擬同步發(fā)電機(jī);逆變器;虛擬功角特性;暫態(tài)穩(wěn)定;能量函數(shù);功率擬合
中圖分類號(hào):TM712 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2019)03-0007-05
Transient Stability Analysis with VSG-IIDG Power System Based on Energy Function
JIAO Yong-hui1, BU Jing1, ZHANG Ning-yu2, ZHOU Qian2, WANG Cheng-gen2, LIU Jian-kun2
(1 School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China;
2 State Grid Jiangsu Electric Power Company Research Institute, Nanjing 2111 00, China)
Abstract: The transient characteristics of the voltage source IIDG using VSG strategy are similar to the synchronous generator, but when the current saturation link is considered, their transient characteristics will be different, and the system transient analysis will be more complex. This paper put forward a kind of transient energy function with VSG-IIDG power system based on the energy function. This paper built the virtual power angle model of the inverter by analyzing the inverter transient characteristic during the transient process and analyzed the influence of the current saturation link on the energy function. On the basis of this, the output power fitting method was adopted to establish the transient energy function with the VSG-IIDG power system. Simulink in MATLAB was used to carry out simulation and to verify the effectiveness of this method.
Key words: VSG; inverter; virtual power angle characteristic; transient stability; energy function; output power fitting
參考文獻(xiàn)
[1] 鄭天文,陳來(lái)軍,陳天一,等. 虛擬同步發(fā)電機(jī)技術(shù)及展望[J]. 電力系統(tǒng)自動(dòng)化,2015,39(21):165-175.
[2] 葉希,魯宗相,喬穎,等. 風(fēng)火聯(lián)運(yùn)源端系統(tǒng)有功優(yōu)化運(yùn)行分層協(xié)調(diào)思路[J]. 電力系統(tǒng)自動(dòng)化,2014,38(20):1-8.
[3] 范明天, 張祖平, 蘇傲雪, 等. 主動(dòng)配電系統(tǒng)可行技術(shù)的研究[J]. 中國(guó)電機(jī)工程學(xué)報(bào),2013,33(22):12-18.
[4] 丁明,楊向真,蘇建徽. 基于虛擬同步發(fā)電機(jī)思想的微電網(wǎng)逆變電源控制策略[J]. 電力系統(tǒng)自動(dòng)化,2009,33(8):89-93.
[5] ZHONG Q C, WEISS G. Synchronverters: inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electronics,2011,58(4):1259-1267.
[6] D’ARCO S, SUUL J A.Equivalence of virtual synchronous machines and frequency-droops for converter-based microgrids[J].IEEE Transactions on Smart Grid,2014,5(1):394-395.
[7] 黃林彬,章雷其,辛煥海,等. 下垂控制逆變器的虛擬功角暫態(tài)穩(wěn)定機(jī)理分析[J]. 電力系統(tǒng)自動(dòng)化,2016,40(12):117-123.
[8] POGAKU N, PRODANOVIC M, GREEN T C.Modeling, analysis and testing of autonomous operation of an inverter-based microgrid[J].IEEE Transactions on Power Electronics,2007,
22(2):613-625.
[9] SHINTAL T, MURA Y, ISE T.Oscillation damping of a distributed generator using a virtual synchronous generator[J].IEEE Transactions on Power Delivery,2014,29(2):668-676.
[10] ALIPOOR J, MIURA Y, ISE T. Distributed generation grid integration using virtual synchronous generator with adoptive virtual inertia[C]//Proceedings of 2013 IEEE Energy Conversion Congress and Exposition,2013,8237:4546-4552.
[11] 程沖,楊歡,曾正,等. 虛擬同步發(fā)電機(jī)的轉(zhuǎn)子慣量自適應(yīng)控制方法[J]. 電力系統(tǒng)自動(dòng)化,2015,39(19):82-89.
[12] PAQUETTE A D, DIVAN D M.Virtual impedance current limiting for inverters in microgrids with synchronous generators[J].IEEE Transactions on Industry Application,2014,51(2):1630-1638.