基于全通滤波器的虚拟同步发电机低电压穿越控制策略
|
摘要
传统的虚拟同步发电机(VSG)不具备低电压穿越能力,在电网电压跌落时难以保持其同步性,造成电流越限及设备脱网,为此提出一种基于全通滤波器(APF)的VSG低电压穿越控制方法。结合APF的工作原理提出在电网电压故障时如何获取准确的频率、相位信息。在此基础上设计了VSG低电压穿越的具体方法,利用阻尼转矩保证转子运动的稳定性,同时增加电网电压偏差反馈防止有功功率指令的突变及释放无功电流,使得VSG在电压跌落时保持了同步性且保证了输出电流的平稳过渡,实现了VSG在不同故障下的低电压穿越。
Traditional VSG(Virtual Synchronous Generator) may lose its synchronism under the voltage dip,resulting in the over-limit current and equipment outage. To solve these problems,a VSG LVRT(Low-Voltage Ride-Through) control method based on APF(All-Pass Filter) is proposed. How to obtain accurate frequency and phase information in the case of voltage fault is proposed according to the principle of APF. On this basis,a definite VSG LVRT control scheme is established. To ensure the synchronism of VSG and smooth the output current under the voltage dip,the proposed approach utilizes the damping torque to stabilize the rotor motion,and further introduces a voltage deviation feedback to prevent the active power command mutation and release the reactive current. Consequently,the VSG LVRT under different grid faults is realized.
Traditional VSG(Virtual Synchronous Generator) may lose its synchronism under the voltage dip,resulting in the over-limit current and equipment outage. To solve these problems,a VSG LVRT(Low-Voltage Ride-Through) control method based on APF(All-Pass Filter) is proposed. How to obtain accurate frequency and phase information in the case of voltage fault is proposed according to the principle of APF. On this basis,a definite VSG LVRT control scheme is established. To ensure the synchronism of VSG and smooth the output current under the voltage dip,the proposed approach utilizes the damping torque to stabilize the rotor motion,and further introduces a voltage deviation feedback to prevent the active power command mutation and release the reactive current. Consequently,the VSG LVRT under different grid faults is realized.
引文
[1] 杜威,姜齐荣,陈蛟瑞.微电网电源的虚拟惯性频率控制策略[J].电力系统自动化,2011,35(23):26-31,36.DU Wei,JIANG Qirong,CHEN Jiaorui.Frequency control strategy of generations based on virtual inertia in a microgrid[J].Automa-tion of Electric Power Systems,2011,35(23):26-31,36.
[2] 王逸超,谢欣涛,陈仲伟,等.不同容量微网逆变器的自适应虚拟阻抗运行策略[J].电力自动化设备,2018,38(6):29-33.WANG Yichao,XIE Xintao,CHEN Zhongwei,et al.Adaptive virtual impedance operation strategy of microgrid inverters with different capacities[J].Electric Power Automation Equipment,2018,38(6):29-33.
[3] LI Y W,VILATHGAMUWA D M,LOH P C.Design,analysis,and real-time testing of a controller for multibus microgrid system[J].IEEE Transactions on Power Electronics,2004,19(5):1195-1203.
[4] ENSLIN J H R,HESKES P J M.Harmonic interaction between a large number of distributed power inverters and the distribution network[J].IEEE Transactions on Power Electronics,2004,19(6):1586-1593.
[5] BORGES C L T,MARTINS V F.Multistage expansion planning for active distribution networks under demand and distributed generation uncertainties[J].Electrical Power and Energy Systems,2012,36:107-116
[6] 张兴,朱德斌,徐海珍.分布式发电中的虚拟同步发电机技术[J].电源学报,2012(3):1-6,12.ZHANG Xing,ZHU Debin,XU Haizhen.Review of virtual synchronous generator technology in distributed generation[J].Journal of Power Supply,2012(3):1-6,12.
[7] CHEN Y,HESSE R,TURSCHNER D,et al.Improving the grid power quality using virtual synchronous machines[C]//2011 International Conference on Power Engineering Energy and Electrical Drives.Malaga,Spain:IEEE,2011:1-6.
[8] VU V T,VISSCHER K,DIAZ J,et al.Virtual synchronous generator:an element of future grids[C]//IEEE Innovative Smart Grid Technologies Conference Europe.Gothenburg,Sweden:IEEE,2010:1-7.
[9] ZHONG Q C,WEISS G.Synchronverters:inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electro-nics,2011,58(4):1259-1267.
[10] 李东东,朱钱唯,程云志,等.基于自适应惯量阻尼综合控制算法的虚拟同步发电机控制策略[J].电力自动化设备,2017,37(11):72-77.LI Dongdong,ZHU Qianwei,CHENG Yunzhi,et al.Control strategy of virtual synchronous generator based on self-adaptive rotor inertia and damping combination control algorithm[J].Electric Power Automation Equipment,2017,37(11):72-77.
[11] 石荣亮,张兴,徐海珍,等.基于虚拟同步发电机的微网运行模式无缝切换控制策略[J].电力系统自动化,2016,40(10):16-23.SHI Rongliang,ZHANG Xing,XU Haizhen,et al.Seamless switching control strategy for microgrid operation modes based on virtual synchronous generator[J].Automation of Electric Power Systems,2016,40(10):16-23.
[12] 王振雄,易皓,卓放,等.应用于光伏微网的一种虚拟同步发电机结构及其动态性能分析[J].中国电机工程学报,2017,37(2):444-454.WANG Zhenxiong,YI Hao,ZHUO Fang,et al.A hardware structure of virtual synchronous generator in photovoltaic microgrid and its dynamic performance analysis[J].Proceedings of the CSEE,2017,37(2):444-454.
[13] 张波,颜湘武,黄毅斌,等.虚拟同步机多机并联稳定控制及其惯量匹配方法[J].电工技术学报,2017,32(10):42-52.ZHANG Bo,YAN Xiangwu,HUANG Yibin,et al.Stability control and inertia matching method of multi-parallel virtual synchronous generators[J].Transactions of China Electrotechnical Society,2017,32(10):42-52.
[14] 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.Lü Zhipeng,SHENG Wanxing,ZHONG Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603.
[15] 陈天一,陈来军,郑天文,等.基于模式平滑切换的虚拟同步发电机低电压穿越控制方法[J].电网技术,2016,40(7):2134-2140.CHEN Tianyi,CHEN Laijun,ZHANG Tianwen,et al.LVRT control method of virtual synchronous generator based on mode smooth switching[J].Power System Technology,2016,40(7):2134-2140.
[16] 廖勇,庄凯,姚骏.电网电压不平衡时全功率风电并网变流器的控制策略[J].电网技术,2012,36(1):72-78.LIAO Yong,ZHUANG Kai,YAO Jun.A control strategy for grid-connecting full power converter of wind power generation system under unbalanced grid voltage[J].Power System Technology,2012,36(1):72-78.
[17] 郑飞,张军军,丁明昌.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):19-24.ZHENG Fei,ZHANG Junjun,DING Mingchang.Low voltage ride through modeling and control strategy for photovoltaic generation system based on RTDS[J].Automation of Electric Power Systems,2012,36(22):1-6.
[18] 周皓,童朝南,刘宝其,等.电网不平衡条件下的光伏并网发电控制策略[J].电力系统自动化,2015,39(12):27-32.ZHOU Hao,TONG Chaonan,LIU Baoqi,et al.A control strategy for grid-connected of photovoltaic system under unbalanced voltage[J].Automation of Electric Power Systems,2015,39(12):27-32.
[19] 王京保,李辉,张娟.电网电压不平衡时光伏并网逆变器低电压穿越技术[J].电力系统及其自动化学报,2016,28(11):111-116.WANG Jingbao,LI Hui,ZHANG Juan.Research on low-voltage ride-through of grid-connected photovoltaic inverter under unbalanced grid voltage conditions[J].Proceedings of the CSU-ESPA,2013,28(11):111-116.
[2] 王逸超,谢欣涛,陈仲伟,等.不同容量微网逆变器的自适应虚拟阻抗运行策略[J].电力自动化设备,2018,38(6):29-33.WANG Yichao,XIE Xintao,CHEN Zhongwei,et al.Adaptive virtual impedance operation strategy of microgrid inverters with different capacities[J].Electric Power Automation Equipment,2018,38(6):29-33.
[3] LI Y W,VILATHGAMUWA D M,LOH P C.Design,analysis,and real-time testing of a controller for multibus microgrid system[J].IEEE Transactions on Power Electronics,2004,19(5):1195-1203.
[4] ENSLIN J H R,HESKES P J M.Harmonic interaction between a large number of distributed power inverters and the distribution network[J].IEEE Transactions on Power Electronics,2004,19(6):1586-1593.
[5] BORGES C L T,MARTINS V F.Multistage expansion planning for active distribution networks under demand and distributed generation uncertainties[J].Electrical Power and Energy Systems,2012,36:107-116
[6] 张兴,朱德斌,徐海珍.分布式发电中的虚拟同步发电机技术[J].电源学报,2012(3):1-6,12.ZHANG Xing,ZHU Debin,XU Haizhen.Review of virtual synchronous generator technology in distributed generation[J].Journal of Power Supply,2012(3):1-6,12.
[7] CHEN Y,HESSE R,TURSCHNER D,et al.Improving the grid power quality using virtual synchronous machines[C]//2011 International Conference on Power Engineering Energy and Electrical Drives.Malaga,Spain:IEEE,2011:1-6.
[8] VU V T,VISSCHER K,DIAZ J,et al.Virtual synchronous generator:an element of future grids[C]//IEEE Innovative Smart Grid Technologies Conference Europe.Gothenburg,Sweden:IEEE,2010:1-7.
[9] ZHONG Q C,WEISS G.Synchronverters:inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electro-nics,2011,58(4):1259-1267.
[10] 李东东,朱钱唯,程云志,等.基于自适应惯量阻尼综合控制算法的虚拟同步发电机控制策略[J].电力自动化设备,2017,37(11):72-77.LI Dongdong,ZHU Qianwei,CHENG Yunzhi,et al.Control strategy of virtual synchronous generator based on self-adaptive rotor inertia and damping combination control algorithm[J].Electric Power Automation Equipment,2017,37(11):72-77.
[11] 石荣亮,张兴,徐海珍,等.基于虚拟同步发电机的微网运行模式无缝切换控制策略[J].电力系统自动化,2016,40(10):16-23.SHI Rongliang,ZHANG Xing,XU Haizhen,et al.Seamless switching control strategy for microgrid operation modes based on virtual synchronous generator[J].Automation of Electric Power Systems,2016,40(10):16-23.
[12] 王振雄,易皓,卓放,等.应用于光伏微网的一种虚拟同步发电机结构及其动态性能分析[J].中国电机工程学报,2017,37(2):444-454.WANG Zhenxiong,YI Hao,ZHUO Fang,et al.A hardware structure of virtual synchronous generator in photovoltaic microgrid and its dynamic performance analysis[J].Proceedings of the CSEE,2017,37(2):444-454.
[13] 张波,颜湘武,黄毅斌,等.虚拟同步机多机并联稳定控制及其惯量匹配方法[J].电工技术学报,2017,32(10):42-52.ZHANG Bo,YAN Xiangwu,HUANG Yibin,et al.Stability control and inertia matching method of multi-parallel virtual synchronous generators[J].Transactions of China Electrotechnical Society,2017,32(10):42-52.
[14] 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.Lü Zhipeng,SHENG Wanxing,ZHONG Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603.
[15] 陈天一,陈来军,郑天文,等.基于模式平滑切换的虚拟同步发电机低电压穿越控制方法[J].电网技术,2016,40(7):2134-2140.CHEN Tianyi,CHEN Laijun,ZHANG Tianwen,et al.LVRT control method of virtual synchronous generator based on mode smooth switching[J].Power System Technology,2016,40(7):2134-2140.
[16] 廖勇,庄凯,姚骏.电网电压不平衡时全功率风电并网变流器的控制策略[J].电网技术,2012,36(1):72-78.LIAO Yong,ZHUANG Kai,YAO Jun.A control strategy for grid-connecting full power converter of wind power generation system under unbalanced grid voltage[J].Power System Technology,2012,36(1):72-78.
[17] 郑飞,张军军,丁明昌.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):19-24.ZHENG Fei,ZHANG Junjun,DING Mingchang.Low voltage ride through modeling and control strategy for photovoltaic generation system based on RTDS[J].Automation of Electric Power Systems,2012,36(22):1-6.
[18] 周皓,童朝南,刘宝其,等.电网不平衡条件下的光伏并网发电控制策略[J].电力系统自动化,2015,39(12):27-32.ZHOU Hao,TONG Chaonan,LIU Baoqi,et al.A control strategy for grid-connected of photovoltaic system under unbalanced voltage[J].Automation of Electric Power Systems,2015,39(12):27-32.
[19] 王京保,李辉,张娟.电网电压不平衡时光伏并网逆变器低电压穿越技术[J].电力系统及其自动化学报,2016,28(11):111-116.WANG Jingbao,LI Hui,ZHANG Juan.Research on low-voltage ride-through of grid-connected photovoltaic inverter under unbalanced grid voltage conditions[J].Proceedings of the CSU-ESPA,2013,28(11):111-116.