基于虚拟三相算法的微网三相逆变器控制
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摘要
针对微电网中非隔离型三电平三相三桥臂逆变器采用传统矢量控制时并网电流总谐波畸变(total harmonicdistortion, THD)和离网时输出电压THD较高、微网缺相故障时无法运行的问题,提出了基于虚拟三相算法的微电网三相逆变器控制。该控制采用基于一阶惯性环节的虚拟三相算法,对逆变器控制所需的电压、电流每一相采样值构造成虚拟的三相对称矢量,并使用所得的虚拟三相矢量进行矢量控制。该控制将逆变器的三相控制分解成为独立的三个单相控制,可在微网缺相时正常运行,基于虚拟三相矢量每个单相控制可实现矢量控制并获得矢量控制带来的高控制精度和快速响应速度,从而减小逆变器并网/离网运行模式时输出电流/电压的THD。采用MATLAB/Simulink数字仿真软件进行了该控制方法实际效果的仿真试验,结果验证了该控制方法的有效性。
Mirco-grid non-isolated three-level three-phase three-leg inverter based on the traditional vector control has poor output current total harmonic distortion(THD) in grid-connected mode, poor output voltage THD in islanded mode and cannot work well in the micro-grid open-phase fault. Aiming at these problems, a control method based on the virtual three-phase was proposed for the micro-grid three-phase inverter. Virtual three-phase algorithm based on the first order inertia element was introduced in the proposed control. Each sampling phase voltage or phase current was built as the virtual three-phase symmetrical vector, which was used for the vector control of the inverter. With the proposed control,three-phase control of the inverter was resolved into the three independent single-phase control, to guarantee the inverter's normal operation during the micro-grid open-phase fault. Based on the virtual three-phase vectors, the single phase control achieved vector control, and then shared the high control accuracy and fast response speed, which reduced the output current THD or the output voltage THD of inverter in grid-connected mode or islanded mode. The simulated system was validated through simulation study carried out by using software interface(MATLAB/SIMULINK). The obtained results demonstrate the effectiveness of the proposed control algorithm.
Mirco-grid non-isolated three-level three-phase three-leg inverter based on the traditional vector control has poor output current total harmonic distortion(THD) in grid-connected mode, poor output voltage THD in islanded mode and cannot work well in the micro-grid open-phase fault. Aiming at these problems, a control method based on the virtual three-phase was proposed for the micro-grid three-phase inverter. Virtual three-phase algorithm based on the first order inertia element was introduced in the proposed control. Each sampling phase voltage or phase current was built as the virtual three-phase symmetrical vector, which was used for the vector control of the inverter. With the proposed control,three-phase control of the inverter was resolved into the three independent single-phase control, to guarantee the inverter's normal operation during the micro-grid open-phase fault. Based on the virtual three-phase vectors, the single phase control achieved vector control, and then shared the high control accuracy and fast response speed, which reduced the output current THD or the output voltage THD of inverter in grid-connected mode or islanded mode. The simulated system was validated through simulation study carried out by using software interface(MATLAB/SIMULINK). The obtained results demonstrate the effectiveness of the proposed control algorithm.
引文
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[18]孔德波,刘义成,高亮,等.虚拟谐波阻抗的并网逆变器谐波抑制方法[J].黑龙江工程学院学报,2015,29(5):52-56,61.
[19]冯伟,孙凯,关雅娟,等.孤立微电网中基于输出电压复合控制的电压源型并网逆变器谐波电流抑制策略[J].电工技术学报,2016,31(7):72-80.DOI:10.3969/j.issn.1000-6753.2016.07.009.
[20]肖湘宁,徐永海,刘昊.电压凹陷特征量检测算法研究[J].电力自动化设备,2002,22(1):19-22.DOI:10.3969/j.issn.1006-6047.2002.01.005.
[2]李瑞生,翟登辉,郭宝甫,等.三电平DC/AC电源转换技术研究[J].电力系统保护与控制,2016,44(20):24-30.DOI:10.7667/PSPC201615.
[3]AHMED I,SUN L T,CHEN X.A novel control scheme for microgrid inverters seamless transferring between grid-connected and islanding mode[C]//Proceedings of the 2017 China International Electrical and Energy Conference(CIEEC).Beijing,China:IEEE,2017:75-80.DOI:10.1109/CIEEC.2017.8388423.
[4]陈磊,季亮,杨兴武,等.LCL型并网逆变器新型频率自适应重复控制方法[J].电力系统保护与控制,2017,45(23):57-64.DOI:10.7667/PSPC170348.
[5]江锐,江涛,许蕾.光伏并入配电网的逆变器控制策略研究[J].电气技术,2017(12):81-85.DOI:10.3969/j.issn.1673-3800.2017.12.016.
[6]郭磊磊,金楠,申永鹏.一种基于优化电压矢量选择的电压源逆变器模型预测共模电压抑制方法[J].电工技术学报,2018,33(6):1347-1355.DOI:10.19595/j.cnki.1000-6753.tces.161422.
[7]KNAUP P.Inverter:WO2007/048420[P].2017-05-03.
[8]邢相洋,陈阿莲,张子成,等.基于改进型零序环流抑制方法的T型三电平并联并网系统[J].中国电机工程学报,2017,37(14):4165-4174,4296.
[9]ZHANG W P,DING C.Mitigation of the low-frequency neutral-point current for three-level T-type inverters in three-phase four-wire systems[J].IET power electronics,2018:1444-1451.DOI:10.1049/iet-pel.2017.0669.
[10]ZHANG L,SUN K,FANG Y.An optimized common mode voltage reduction PWM strategy for T-type three phase three level photovoltaic grid-tied inverter[C]//Proceedings of the 2013 IEEE Energy Conversion Congress and Exposition.Denver,CO,USA:IEEE,2013:1623-1627.DOI:10.1109/ECCE.2013.6646900.
[11]ZHANG Z,JIANG M,YAO Y,et al.Transformerless three-phase T-type three-level inverter for medium-power photovoltaic systems[C]//Proceedings of the 2016 IEEE8th International Power Electronics and Motion Control Conference.Hefei,China:IEEE,2016:1592-1595.DOI:10.1109/IPEMC.2016.7512530.
[12]郭利辉.T型三电平逆变器无差拍电流预测和中点平衡控制方法[J].电力系统保护与控制,2016,44(18):127-132.DOI:10.7667/PSPC151766.
[13]RONCERO-CLEMENTE C,ROMERO-CADAVAL E,Ruiz-CORTéS M,et al.Carrier level-shifted based control method for the PWM 3L-T-Type qZS inverter with capacitor imbalance compensation[J].IEEEtransactions on industrial electronics,2018,65(10):8297-8306.DOI:10.1109/TIE.2018.2814020.
[14]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.DOI:10.19595/j.cnki.1000-6753.tces.161978.
[15]朱永强,贾利虎,谢文超,等.一种用于单相/三相变换的新型电力电子变换技术[J].电工技术学报,2018,33(7):1433-1439.DOI:10.19595/j.cnki.1000-6753.tces.161146.
[16]滕国飞,肖国春,张志波,等.采用重复控制的LCL型并网逆变器单闭环电流控制[J].中国电机工程学报,2013,33(24):13-21.
[17]COSTA B L G,BACON V D,DA SILVA S A O,et al.Tuning of a PI-MR controller based on differentia evolution metaheuristic applied to the current control loop of a Shunt-APF[J].IEEE transactions on industrial electronics,2017,64(6):4751-4761.DOI:10.1109/TIE.2017.2674609.
[18]孔德波,刘义成,高亮,等.虚拟谐波阻抗的并网逆变器谐波抑制方法[J].黑龙江工程学院学报,2015,29(5):52-56,61.
[19]冯伟,孙凯,关雅娟,等.孤立微电网中基于输出电压复合控制的电压源型并网逆变器谐波电流抑制策略[J].电工技术学报,2016,31(7):72-80.DOI:10.3969/j.issn.1000-6753.2016.07.009.
[20]肖湘宁,徐永海,刘昊.电压凹陷特征量检测算法研究[J].电力自动化设备,2002,22(1):19-22.DOI:10.3969/j.issn.1006-6047.2002.01.005.