T型三电平逆变器的并网电流D-Σ数字控制算法
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摘要
为了提高T型三电平逆变器的并网电流质量,加快并网逆变器系统的动态响应速度,提高稳态控制精度,研究一种基于D-Σ数字控制的并网电流控制方法。根据T型三电平逆变器的单相等效电路,建立T型三电平逆变器的暂态数学模型,深入分析D-Σ数字控制原理,提出电网中性点与直流侧中点之间共模电压的预估方法,对比分析D-Σ数字控制与传统无差拍控制的动静态性能。通过仿真和实验研究证明了D-Σ数字控制的有效性和共模电压预估的正确性,充分展示了该算法优良的动静态性能。
In this paper,a grid-connected current control based on D-Σ digital control is studied to improve the grid-connected performance of three-level T-type inverter,accelerate the dynamic response speed and improve the steady state control accuracy of the grid-connected inverter system.The transient mathematical model is established according to the single-phase equivalent circuit of the three-level T-type inverter.The principle of D-Σ digital control is deeply analyzed,and an estimation method of common-mode voltage between neutral point of the power grid and neutral-point of the DC bus is proposed.The dynamic and static performance of D-Σ digital control is compared with that of traditional deadbeat control.The validity of D-Σ digital control and the correctness of the common-mode voltage estimation are proved by simulations and experiments,which demonstrates the excellent dynamic and static performance of the algorithm.
In this paper,a grid-connected current control based on D-Σ digital control is studied to improve the grid-connected performance of three-level T-type inverter,accelerate the dynamic response speed and improve the steady state control accuracy of the grid-connected inverter system.The transient mathematical model is established according to the single-phase equivalent circuit of the three-level T-type inverter.The principle of D-Σ digital control is deeply analyzed,and an estimation method of common-mode voltage between neutral point of the power grid and neutral-point of the DC bus is proposed.The dynamic and static performance of D-Σ digital control is compared with that of traditional deadbeat control.The validity of D-Σ digital control and the correctness of the common-mode voltage estimation are proved by simulations and experiments,which demonstrates the excellent dynamic and static performance of the algorithm.
引文
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[13]Pichan M,Rastegar H,Monfared M.Deadbeat control of the stand-alone four-leg inverter considering the effect of the neutral line inductor[J]IEEE Transactions on Industrial Electronics,201764(4):2592-2601.
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[15]Wu T F,Chang C H,Lin L C,et al.D-Σdigital control for a three-phase transformerless bi-directional inverter with wide inductance variation[C]//2013IEEE ECCE Asia Downunder,Melbourne,VIC,Australia,2013:73-79.
[16]Wu T F,Hsieh H C,Hsu C W,et al.Three-phase three-wire active power filter with D-Σdigital control to accommodate filter-inductance variation[J].IEEEJournal of Emerging and Selected Topics in Power Electronics,2016,4(1):44-53.
[17]Wu T F,Lin L C,Yao N,et al.Extended application of D-Σdigital control to a single-phase bidirectional inverter with an LCL filter[J].IEEE Transactions on Power Electronics,2015,30(7):3903-3911.
[18]Wu T F,Lee P H,Lin L C,et al.Circulating current reduction for three-phase back-to-back transformerless inverter with SPWM based D-Σdigital control[J].IEEE Transactions on Power Electronics,2016,32(2):1591-1601.
[19]Wu T F,Chou T C,Huang J W,et al.Grid-connected bi-directional modular multilevel converter with D-Σdigital control[C]//IEEE Future Energy Electronics Conference and ECCE Asia,Taiwan,2017:319-325.
[20]姜卫东,赵德勇,汪磊,等.一种以降低逆变器开关损耗为目标并考虑中点电位平衡的适用于中点钳位式三电平逆变器的调制方法[J].中国电机工程学报,2016,36(5):1376-1386.Jiang Weidong,Zhao Deyong,Wang Lei,et al.Amodulation method with reduced switching losses and considering the neutral point voltage balance suitable for the neutral point clamped three-level inverter[J].Proceedings of the CSEE,2016,36(5):1376-1386.
[2]朱晓娟,胡海涛,陶海东,等.光伏并网系统的谐波不稳定产生机理及影响规律[J].电工技术学报,2017,32(10):33-41.Zhu Xiaojuan,Hu Haitao,Tao Haidong,et al.The mechanism and influence of harmonic instablilty for photovoltaic grid-connected system[J].Transactions of China Electrotechnical Society,2017,32(10):33-41.
[3]郑堃,周林,张前进,等.数字控制下光伏并网逆变器稳定性分析及参数优化设计[J].电工技术学报,2018,33(8):1802-1813.Zheng Kun,Zhou Lin,Zhang Qianjin,et al.Stability analysis and parameter optimization design of photovoltaic grid-connected inverter under digital control[J].Transactions of China Electrotechnical Society,2018,33(8):1802-1813.
[4]姜卫东,赵德勇,胡杨,等.基于载波实现的二极管钳位型三电平逆变器虚拟空间矢量脉宽调制方法[J].电工技术学报,2016,31(12):153-160.Jiang Weidong,Zhao Deyong,Hu Yang,et al.Carrier-based virtual space vector pulse width modulation for diode clamped three-level inverter[J]Transactions of China Electrotechnical Society,2016,31(12):153-160.
[5]Kim H S,Kwon Y C,Chee S J,et al.Analysis and compensation of inverter nonlinearity for three-level T-type inverters[J].IEEE Transactions on Power Electronics,2017,32(6):4970-4980.
[6]李敏裕,马晓军,魏曙光,等.T型逆变器中点电压全范围精确平衡研究[J].电工技术学报,2018,33(8):1814-1826.Li Minyu,Ma Xiaojun,Wei Shuguang,et al Research on full range accurate balance of neutral point voltage for T-type inverter[J].Transactions of China Electrotechnical Society,2018,33(8):1814-1826.
[7]马晓军,李敏裕,魏曙光,等.T型逆变器开路故障诊断[J].电工技术学报,2018,33(10):2324-2333.Ma Xiaojun,Li Minyu,Wei Shuguang,et al.Open circuit fault diagnosis of T-type inverter[J].Transactions of China Electrotechnical Society,2018,33(10):2324-2333.
[8]冯腾,康龙云,胡毕华,等.基于无差拍控制的T型三电平逆变器中点电位平衡策略[J].电工技术学报,2018,33(8):1827-1834.Feng Teng,Kang Longyun,Hu Bihua,et al.A neutral point potential balancing strategy for three-level T-type inverter based on deadbeat control[J].Transactions of China Electrotechnical Society,2018,33(8):1827-1834.
[9]Reyes M,Rodriguez P,Vazquez S,et al.Enhanced decoupled double synchronous reference frame current controller for unbalanced grid-voltage conditions[J].IEEE Transactions on Power Electronics,2012,27(9):3934-3943.
[10]Zmood D N,Holmes D G.Stationary frame current regulation of PWM inverters with zero steady-state error[J].IEEE Transactions on Power Electronics,2003,18(3):814-822.
[11]刘全伟,邓焰,胡义华,等.基于电流预测和虚拟过采样的数字滞环控制[J].电工技术学报,2014,29(10):127-133.Liu Quanwei,Deng Yan,Hu Yihua,et al.Current prediction and virtual over-sampling based digital hysteresis control[J].Transactions of China Electrotechnical Society,2014,29(10):127-133.
[12]贾要勤,朱明琳,凤勇.基于状态反馈的单相电压型逆变器重复控制[J].电工技术学报,2014,29(6):57-63.Jia Yaoqin,Zhu Minglin,Feng Yong.State feedback based repetitive control for single-phase inverter[J]Transactions of China Electrotechnical Society,2014,29(6):57-63.
[13]Pichan M,Rastegar H,Monfared M.Deadbeat control of the stand-alone four-leg inverter considering the effect of the neutral line inductor[J]IEEE Transactions on Industrial Electronics,201764(4):2592-2601.
[14]Jiang Weidong,Ding Xingxing,Ni Youyuan,et al.An improved deadbeat control for a three-phase threeline active power filter with current tracking errors compensation[J].IEEE Transactions on Power Electronics,2017,DOI:10.1109/TPEL.2017.2693325.
[15]Wu T F,Chang C H,Lin L C,et al.D-Σdigital control for a three-phase transformerless bi-directional inverter with wide inductance variation[C]//2013IEEE ECCE Asia Downunder,Melbourne,VIC,Australia,2013:73-79.
[16]Wu T F,Hsieh H C,Hsu C W,et al.Three-phase three-wire active power filter with D-Σdigital control to accommodate filter-inductance variation[J].IEEEJournal of Emerging and Selected Topics in Power Electronics,2016,4(1):44-53.
[17]Wu T F,Lin L C,Yao N,et al.Extended application of D-Σdigital control to a single-phase bidirectional inverter with an LCL filter[J].IEEE Transactions on Power Electronics,2015,30(7):3903-3911.
[18]Wu T F,Lee P H,Lin L C,et al.Circulating current reduction for three-phase back-to-back transformerless inverter with SPWM based D-Σdigital control[J].IEEE Transactions on Power Electronics,2016,32(2):1591-1601.
[19]Wu T F,Chou T C,Huang J W,et al.Grid-connected bi-directional modular multilevel converter with D-Σdigital control[C]//IEEE Future Energy Electronics Conference and ECCE Asia,Taiwan,2017:319-325.
[20]姜卫东,赵德勇,汪磊,等.一种以降低逆变器开关损耗为目标并考虑中点电位平衡的适用于中点钳位式三电平逆变器的调制方法[J].中国电机工程学报,2016,36(5):1376-1386.Jiang Weidong,Zhao Deyong,Wang Lei,et al.Amodulation method with reduced switching losses and considering the neutral point voltage balance suitable for the neutral point clamped three-level inverter[J].Proceedings of the CSEE,2016,36(5):1376-1386.