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多储能逆变器并联系统在微网孤岛条件下的稳定性分析及其控制策略

DOI: 10.13336/j.1003-6520.hve.2015.10.011, PP. 3266-3273

Keywords: 逆变器并联,功率均分,阻抗稳定性,下垂控制,虚拟阻抗,光储微网

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Abstract:

多台储能逆变器在微网孤岛条件下并联运行时,需要为整个微网系统提供稳定的电压频率支撑,但逆变器等效输出阻抗和线路阻抗的差异会造成功率分配不均以及环流过大等问题,从而导致整个微网系统的不稳定。为了解决上述问题,可以在传统P-U、Q-f(调整有功功率来稳定微网电压、调整无功功率来稳定微网频率)下垂控制策略的基础上采用虚拟阻抗技术,通过对虚拟阻抗的设计将所有逆变器的等效输出阻抗设计为阻性,从而实现负荷功率的均分。从多储能逆变器并联系统的拓扑结构入手,分析了储能逆变器并联系统的功率流动特性并建立其输出阻抗模型;对整个系统的控制策略进行详细的介绍,包括引入虚拟阻抗的下垂控制策略以及储能逆变器的双闭环控制策略;根据阻抗稳定性分析法,分析了逆变器滤波参数和控制参数对整个系统稳定性能的影响,基于该工况可以发现当滤波电感L增加到5mH时,逆变器并联系统趋于不稳定;虚拟阻抗系数kL增大到3时,系统阻抗比乃奎斯特曲线越过拒绝域,同时也会使系统的等效输出阻抗由偏阻容性变成感性,不利于高次谐波的抑制;而虚拟阻抗系数RD增大可以加强功率均分效果且对系统的稳定性影响较小。仿真结果说明,在该工况条件下,通过合理的设计逆变器输出阻抗,可以使多逆变器间的环流最大值由30A降低到3A以内,从而保证光储微网在孤岛条件下的稳定运行。

References

[1]  毕大强,牟晓春,任先文,等. 含多微源的微电网控制策略设计[J]. 高电压技术,2011,37(3):687-693. BI Daqiang, MOU Xiaochun, REN Xianwen, et al . Design on control strategies of microgrid with multiple micro sources[J]. High Voltage Engineering, 2011, 37(3):687-693.
[2]  胡 军,蔡静文,何金良,等. 含微网智能配网自愈过程过电压影响因素[J]. 高电压技术,2014,40(5):1559-1566. HU Jun, CAI Jingwen, HE Jinliang, et al .Factors impacting self-healing overvoltage of smart distribution network connected with microgrids[J]. High Voltage Engineering, 2014, 40(5):1559-1566.
[3]  陈 堃,陈昌旺,刘涤尘. 逆变器并联系统直流环流瞬时抑制策略[J]. 高电压技术,2014,40(2):604-610. CHEN Kun, CHEN Changwang, LIU Dichen. Strategy for instantaneously restraining DC circulating current in parallel inverter system[J]. High Voltage Engineering, 2014, 40(2): 604-610.
[4]  张文亮,丘 明,来小康. 储能技术在电力系统中的应用[J]. 电网技术,2008,32(7):1-9. ZHANG Wenliang, QIU Ming, LAI Xiaokang. Application of energy storage technologies in power grid[J]. Power System Technology, 2008, 32(7): 1-9.
[5]  Guerrero J M, de Vicuna L, Miret J, et al . Output impedance performance for parallel operation of UPS inverters using wireless and average current-sharing controllers[C]∥IEEE 35 th Annual Power Electronics Specialists Conference. [S.l.]: IEEE, 2004: 2482-2488.
[6]  Tuladhar A, Jin H, Unger T, et al . Control of parallel inverters in distributed AC power systems with consideration of line impedance effect[J]. IEEE Transactions on Industrial Applications, 2000, 36 (1): 131-138.
[7]  张 尧,马 皓,雷 彪,等. 基于下垂特性控制的无互联线逆变器并联动态性能分析[J]. 中国电机工程学报,2009,29(3):42-48. ZHANG Yao, MA Hao, LEI Biao, et al . Analysis of dynamic performance for parallel operation of inverters without wire interconnections[J]. Proceedings of the CSEE, 2009, 29(3): 42-48.
[8]  杨向真,苏建徽,丁 明,等. 面向多逆变器的微电网电压控制策略[J]. 中国电机工程学报,2012,32(7):7-13. YANG Xiangzhen, SU Jianhui, DING Ming, et al . Voltage control strategies for microgrid with multiple inverters[J]. Proceedings of the CSEE, 2012, 32 (7): 7-13.
[9]  Middlebrook R D. Input filter considerations design and application of switching regulators[C]∥Proceedings of IEEE Industrial Application Society Annual Meeting. Chicago, USA: IEEE, 1976:91-107.
[10]  姜桂宾,裴云庆,杨 旭,等. SPWM逆变电源的无互联信号线并联控制技术[J]. 中国电机工程学报,2003,23(12):97-101. JIANG Guibin, PEI Yunqing, YANG Xu, et al . Parallel operation of sinusoid wave inverters without control interconnections[J]. Proceedings of the CSEE, 2003, 23(12): 97-101.
[11]  Guerrero J M, Garcia de Vicuna L, Matas J, et al . Output impedance design of parallel-connected UPS inverters with wireless load-sharing control[J]. IEEE Transactions on Industry Applications, 2005, 52(4): 1126-1135.
[12]  姚 玮,高明智,陈 敏,等. 可调阻抗无互联线并联逆变器的控制方法[J]. 电力电子技术,2007,41(9):21-23. YAO Wei, GAO Mingzhi, CHEN Min, et al . An improved droop method with the adjustment of output impedance for wireless parallel operation of inverters[J]. Power Electronics, 2007,41(9): 21-23.
[13]  周贤正,荣 飞,吕志鹏,等. 低压微电网采用坐标旋转的虚拟功率V/f下垂控制策略[J]. 电力系统自动化,2012,36(2):47-51. ZHOU Xianzheng, RONG Fei, LÜ Zhipeng, et al . A coordinate rotational transformation based virtual power V/f droop control method for low voltage microgrid[J]. Automation of Electric Power Systems, 2012, 36(2): 47-51.
[14]  姜世公,王 卫,刘桂花,等. 微网孤岛运行条件下基于导纳域的稳定性研究[J]. 电力自动化设备,2013,33(5):19-25. JIANG Shigong, WANG Wei, LIU Guihua, et al . Adimittance specification stability of islanded microgrid[J]. Electric Power Automation Equipment, 2013, 33(5): 19-25.
[15]  王成山,高 菲,李 鹏,等. 低压微网控制策略研究[J]. 中国电机工程学报,2012,32(25):2-9. WANG Chengshan, GAO Fei, LI Peng, et al . Control strategy research on low voltage microgrid[J]. Proceedings of the CSEE, 2012, 32(25): 2-9.
[16]  朱荣伍,伍小杰,杨 艳,等. 采用比例谐振调节器的单相电压型PWM整流器[J]. 高电压技术,2010,36(8):2095-2100. ZHU Rongwu, WU Xiaojie, YANG Yan, et al . Single-phase voltage-source PWM rectifier using proportion resonant controller[J]. High Voltage Engineering, 2010, 36(8): 2095-2100.
[17]  Engler A, Soultanis N. Droop control in LV-grids[C]∥Proceedings of the 2005 International Conference on Future Power Systems. Amsterdam, The Netherlands: [s.n.], 2005: 1-6.

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