三相四桥臂逆变器不对称故障穿越限流控制及电网电压支撑改进策略Asymmetrical Fault-ride-through Strategy of Three-phase Four-leg Inverter With Current Limitation and Grid Voltage Support
雷金勇;葛俊;谈赢杰;帅智康;胡洋;肖敏;
摘要(Abstract):
当电网发生不对称故障时,并网逆变器自身限流控制及支撑故障电网的能力决定了系统运行的可靠性。为解决该问题,首先,对三相四线制并网系统中瞬时功率关系进行分析,获得以功率波动抑制为目标的三相四桥臂逆变器进网电流各序分量的参考表达式。然后,通过与不同的电压跌落深度和功率因数进行对比,得出中线电流为最大相电流幅值的重要结论,并给出三相四桥臂逆变器能提供的最大有功和无功功率。在此基础上,提出了基于最大相电流约束和改进无功注入曲线的三相四桥臂逆变器不对称故障穿越策略,在满足并网逆变器自身安全情况下优先注入定量无功功率,从而实现了对故障电网电压的有效支撑。最后对传统方法及文中所提方法进行了对比仿真研究,结果验证了提出方法的可行性和有效性。
关键词(KeyWords): 不对称故障;三相四桥臂逆变器;限流控制;改进无功注入曲线;电网电压支撑;功率波动抑制
基金项目(Foundation): 南方电网公司科技项目(ZBKJXM20180211)~~
作者(Author): 雷金勇;葛俊;谈赢杰;帅智康;胡洋;肖敏;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.0787
参考文献(References):
- [1] Guerrero J M,Blaabjerg F,Zhelev T,et al.Distributed generation:toward a new energy paradigm[J]. IEEE Industrial Electronics Magazine,2010,4(1):52-64.
- [2] Blaabjerg F,Chen Z,Kjaer S.Power electronics as efficient interface in dispersed power generation systems[J].IEEE Transactions on Power Electronics,2004,19(5):1184-1194.
- [3] Rocabert J,Luna A,Blaabjerg F,et al.Control of power converters in AC microgrids[J].IEEE Transactions on Power Electronics,2012,27(11):4734-4749.
- [4] Sinsukthavorn W,Ortjohann E,Mohd A,et al.Control strategy for three-/four-wire inverter based distributed generation[J]. IEEE Transactions on Industrial Electronics,2012,59(10):3890-3899.
- [5] Vechiu I,Curea O,Camblong H,et al.Transient operation of a fourleg inverter for autonomous applications with unbalanced load[J].IEEE Transactions on Power Electronics,2010,25(2):399-407.
- [6] Miveh M R,Rahmat M F,Ghadimi A A,et al.Control techniques for three-phase four-leg voltage source inverters in autonomous microgrids:a review[J].Renewable and Sustainable Energy Reviews,2016(54):1592-1610.
- [7] Li Y W,Vilathgamuwa D M,Loh P C.Microgrid power quality enhancement using a three-phase four-wire grid-interfacing compensator[J].IEEE Transactions on Industry Applications,2005,41(6):1707-1719.
- [8] Geng H,Liu C,Yang G.LVRT capability of DFIG-based WECS under asymmetrical grid fault condition[J].IEEE Transactions on Industrial Electronics,2013,60(6):2495-2509.
- [9] Alam M R,Muttaqi K M,Bouzerdoum A.Characterizing voltage sags and swells using three-phase voltage ellipse parameters[J].IEEE Transactions on Industry Applications,2015,51(4):2780-2790.
- [10] Lee C T,Hsu C W,Cheng P T.A low voltage ride through technique for grid-connected converters of distributed energy resources[J].IEEE Transactions on Industry Applications,2011,47(4):1821-1832.
- [11] E. ON Netz GmbH. Grid code high and extra high voltage[S].Bayreuth,Germany:E.ON Netz GmbH,2006.
- [12] Rodriguez P,Timbus A V,Teodorescu R,et al.Flexible active power control of distributed power generation systems during grid faults[J].IEEE Transactions on Industrial Electronics,2007,54(5):2583-2592.
- [13] Rodriguez P,Timbus A,Teodorescu R,et al.Reactive power control for improving wind turbine system behavior under grid faults[J]. IEEE Transactions on Power Electronics, 2009, 24(7):1798-1801.
- [14] Wang F,Duarte J L,Hendrix M A M.Pliant active and reactive power control for grid-interactive converters under unbalanced voltage dips[J].IEEE Transactions on Power Electronics,2011,26(5):1511-1521.
- [15] Ma K, Chen W, Liserre M, et al. Power controllability of a three-phase converter with an unbalanced AC source[J]. IEEE Transactions on Power Electronics,2015,30(3):1591-1604.
- [16] Guo W Y,Xiao L Y,Dai S T,et al.LVRT capability enhancement of DFIG with switch-type fault current limiter[J].IEEE Transactions on Industrial Electronics,2007,62(1):332-342.
- [17] Jafari M, Naderi S B, Tarafdar Hagh M, et al. Voltage sag compensation of point of common coupling(PCC)using fault current limiter[J].IEEE Transactions on Power Delivery,2011,26(4):2638-2646.
- [18] Miret J, Castilla M, Camacho A, et al. Control scheme for photovoltaic three-phase inverters to minimize peak currents during unbalanced grid-voltage sags[J]. IEEE Transactions on Power Electronics,2012,27(10):4262-4271.
- [19] Guo X Q,Liu W Z,Lu Z G.Flexible power regulation and current-limited control of the grid-connected inverter under unbalanced grid voltage faults[J].IEEE Transactions on Industrial Electronics,2017,64(9):7425-7432.
- [20] Shuai Z K,Xiao M,Ge J,et al.Overcurrent and its restraining method of PQ controlled three-phase four-wire converter under asymmetrical grid fault[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2019,7(3):2057-2069.
- [21] Shin D,Lee K J,Lee J P,et al.Implementation of fault ride-through techniques of grid-connected inverter for distributed energy resources with adaptive low-pass notch PLL[J].IEEE Transactions on Power Electronics,2015,30(5):2859-2871.
- [22] Rivera M,Yaramasu V,Rodriguez J,et al.Model predictive current control of two-level four-leg inverter-part II:experimental implementation and validation[J]. IEEE Transactions on Power Electronics,2013,28(7):3469-3478.
- [23] Chen X,Zhang Y,Wang S S,et al.Impedance-phased dynamic control method for grid-connected inverters in a weak grid[J].IEEE Transactions on Power Electronics,2017,32(1):274-283.
- [24] Castilla M,Miret J,Matas J,et al.Control design guidelines for single-phase grid-connected photovoltaic inverters with damped resonant harmonic compensators[J].IEEE Transactions on Industrial Electronics,2009,56(11):4492-4501.