基于能量函數法的含VSG-IIDG電力系統暫態穩定分析
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 自動化學院,江蘇 南京 210094;2 國網江蘇省電力公司電力科學研究院,江蘇 南京 211100)
摘 要:采用虛擬同步發電機(VSG)策略的電壓源逆變型分布式電源(IIDG)的暫態特性與同步發電機類似,而其電流飽和環節使其暫態特性又有別于同步發電機,使系統暫態穩定分析變得更加復雜?;谀芰亢瘮捣ㄌ岢隽艘环N計及VSG-IIDG電力系統的暫態能量函數。通過分析暫態過程中逆變器的暫態特性,以此構建其虛擬功角模型,并分析了電流飽和環節對能量函數的影響,基于此,采用輸出功率擬合方法構建了計及VSG-IIDG的系統暫態能量函數。利用MATLAB/Simulink進行了仿真,驗證了該方法的有效性。
關鍵詞:虛擬同步發電機;逆變器;虛擬功角特性;暫態穩定;能量函數;功率擬合
中圖分類號:TM712 文獻標識碼:A 文章編號: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
[1] 鄭天文,陳來軍,陳天一,等. 虛擬同步發電機技術及展望[J]. 電力系統自動化,2015,39(21):165-175.
[2] 葉希,魯宗相,喬穎,等. 風火聯運源端系統有功優化運行分層協調思路[J]. 電力系統自動化,2014,38(20):1-8.
[3] 范明天, 張祖平, 蘇傲雪, 等. 主動配電系統可行技術的研究[J]. 中國電機工程學報,2013,33(22):12-18.
[4] 丁明,楊向真,蘇建徽. 基于虛擬同步發電機思想的微電網逆變電源控制策略[J]. 電力系統自動化,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穩定機理分析[J]. 電力系統自動化,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. 虛擬同步發電機的轉子慣量自適應控制方法[J]. 電力系統自動化,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.