万晓凤;胡海林;聂晓艺;余运俊;曾繁鹏;

• 1:南昌大学信息工程学院
• 2:江苏林洋能源股份有限公司

摘要(Abstract)：

在电网电压不平衡并网逆变器瞬时功率数学模型基础上,分析了传统虚拟同步发电机(virtual synchronous generator,VSG)控制在电网电压不平衡时存在的问题:逆变器输出电流三相不平衡,输出有功功率及无功功率出现2倍电网频率波动,提出了一种改进型VSG控制策略。改进后的控制策略在dq坐标系下,利用平衡电流VSG控制得到基准正序电流指令,结合电网电压不平衡参数以及瞬时功率数学模型,得到不同控制目标下,并网逆变器正、负序电流指令值,并分别对正、负序电流指令进行跟踪得到正、负序电压调制信号,将正、负序电压调制信号合成为最终调制信号。改进后的VSG控制策略不改变VSG控制机理,保留VSG原有控制特性,分别实现了输出电流三相平衡,抑制有功或无功功率2倍电网频率波动的控制目标。仿真及实验结果表明所提出控制策略的有效性。

关键词(KeyWords)： 虚拟同步发电机;电网电压不平衡;电流不平衡;有功及无功功率波动;正、负序电流

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(61563034);; 国家国际科技合作专项(2014DFG72240);; 江西科技落地计划(KJLD14006)~~

作者(Author): 万晓凤;胡海林;聂晓艺;余运俊;曾繁鹏;

Email:

DOI:

参考文献(References)：

• [1]杨新法,苏剑,吕志鹏,等.微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.Yang Xinfa,Su Jian,LüZhipeng,et al.Overview on micro-grid technology[J].Proceedings of the CSEE,2014,34(1):57-70(in Chinese).
• [2]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.LüZhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(6):2591-2603(in Chinese).
• [3]郑天文,陈来军,陈天一,等.虚拟同步发电机技术及展望[J].电力系统自动化,2015,39(21):165-175.Zheng Tianwen,Chen Laijun,Chen Tianyi,et al.Review and prospect of virtual synchronous generator technologies[J].Automation of Electric Power Systems,2015,39(21):165-175(in Chinese).
• [4]Beck H P,Hesse R.Virtual synchronous machine[C]//2007 9th International Conference on Electrical Power Quality and Utilisation,Barcelona,Spain.IEEE,2007:1-6.
• [5]Visscher K,De Haan S W H.Virtual synchronous machines(VSG’s)for frequency stabilization in future grids with a significant share of decentralized generation[C]//Smart Grids for Distribution 2008,Frankfurt,Germany.IET-CIRED.CIRED Seminar.IET,2008:1-4.
• [6]丁明,杨向真,苏建徽.基于虚拟同步发电机思想的微电网逆变电源控制策略[J].电力系统自动化,2009,33(8):89-93.Ding Ming,Yang Xiangzhen,Su Jianhui.Control strategies of inverters based on virtual synchronous generator in a microgrid[J].Automation of Electric Power Systems,2009,33(8):89-93(in Chinese).
• [7]Zhong Q C,Weiss G.Synchronverters:Inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electronics,2011,58(4):1259-1267.
• [8]Ashabani S M,Mohamed Y A R I.A flexible control strategy for grid-connected and islanded microgrids with enhanced stability using nonlinear microgrid stabilizer[J].IEEE Transactions on Smart Grid,2012,3(3):1291-1301.
• [9]陈天一,陈来军,汪雨辰,等.考虑不平衡电网电压的虚拟同步发电机平衡电流控制方法[J].电网技术,2016,40(3):904-909.Chen Tianyi,Chen Laijun,Wang Yuchen,et al.Balanced current control of virtual synchronous generator considering unbalanced grid voltage[J].Power System Technology,2016,40(3):904-909(in Chinese).
• [10]Zhong Q C,Phi-Long N,Ma Z Y,et al.Self-synchronized synchronverters:inverters without a dedicated synchronization unit[J].IEEE Transactions on Power Electronics,2014,29(2):617-630.
• [11]Alipoor J,Miura Y,Ise T.Voltage sag ride-through performance of Virtual Synchronous Generator[J].IEEJ Journal of Industry Applications,2015,4(5):654-666.
• [12]郭小强,张学,卢志刚,等.不平衡电网电压下光伏并网逆变器功率/电流质量协调控制策略[J].中国电机工程学报,2014,34(3):346-353.Guo Xiaoqiang,Zhang Xue,Lu Zhigang,et al.Coordinate control of power and current quality for grid-connected PV inverters under unbalanced grid voltage[J].Proceedings of the CSEE,2014,34(3):346-353(in Chinese).
• [13]雷芸,肖岚,郑昕昕.不平衡电网下无锁相环三相并网逆变器控制策略[J].中国电机工程学报,2015,35(18):4744-4752.Lei Yun,Xiao Lan,Zheng Xinxin.Control strategies of three-phase grid-connected inverters without phase-lock loop under unbalanced grids[J].Proceedings of the CSEE,2015,35(18):4744-4752(in Chinese).
• [14]熊平化,孙丹,邓伦杰.广义谐波电网环境电压源型并网变流器滑模变结构直接功率控制策略[J].电网技术,2016,40(6):1845-1850.Xiong Pinghua,Sun Dan,Deng Lunjie.Improved sliding mode based direct power control strategy of grid connected voltage sourced converter under universal harmonic grid[J].Power System Technology,2016,40(6):1845-1850(in Chinese).
• [15]年珩,於妮飒,曾嵘.不平衡电压下并网逆变器的预测电流控制策略[J].电网技术,2013,37(5):1223-1229.Nian Heng,Yu Nisa,Zeng Rong.Predictive current control for grid-connected inverters under unbalanced grid voltage[J].Power System Technology,2013,37(5):1223-1229(in Chinese).
• [16]孟建辉,王毅,石新春,等.基于虚拟同步发电机的分布式逆变电源控制策略及参数分析[J].电工技术学报,2014,29(12):1-10.Meng Jianhui,Wang Yi,Shi Xinchun,et al.Control strategy and parameter analysis of distributed inverters based on VSG[J].Transactions of China Electrotechnical Society,2014,29(12):1-10(in Chinese).
• [17]郜克存,毕大强,戴瑜兴.基于虚拟同步发电机的船舶岸电电源控制策略[J].电机与控制学报,2015,19(2):45-52.Gao Kecun,Bi Daqiang,Dai Yuxing.Novel control strategy of shore power supply based on virtual synchronous generator[J].Electric Machines and Control,2015,19(2):45-52(in Chinese).
• [18]Guan M,Pan W,Zhang J,et al.Synchronous generator emulation control strategy for voltage source converter(VSC)stations[J].IEEETransactions on Power Systems,2015,30(6):3093-3101.
• [19]吴恒,阮新波,杨东升,等.虚拟同步发电机功率环的建模与参数设计[J].中国电机工程学报,2015,35(24):6508-6518.Wu Heng,Ruan Xinbo,Yang Dongsheng,et al.Modeling of the power loop and parameter design of virtual synchronous generators[J].Proceedings of the CSEE,2015,35(24):6508-6518(in Chinese).
• [20]孟建辉,石新春,王毅,等.改善微电网频率稳定性的分布式逆变电源控制策略[J].电工技术学报,2015,30(4):70-79.Meng Jianhui,Shi Xinchun,Wang Yi,et al.Control strategy of DERinverter for improving frequency stability of microgrid[J].Transactions of China Electrotechnical Society,2015,30(4):70-79(in Chinese).
• [21]年珩,於妮飒,曾嵘.不平衡电压下并网逆变器的预测电流控制策略[J].电网技术,2013,37(5):1223-1229.Nina Heng,Yu Nisa,Zeng Rong.Predictive current control for grid-connected inverters under unbalanced grid voltage[J].Power System Technology,2013,37(5):1223-1229(in Chinese).