基于重复多谐振的LCL并网逆变器复合控制策略
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摘要
在LCL型逆变并网系统中,谐波的出现会导致电力电子器件损耗、电机和变压器效率降低、电容器发热损耗以及干扰通讯控制系统等诸多危害。本文在分析LCL型并网逆变器拓扑结构之后,利用准PR控制可以实现无静差跟踪,以及重复控制可以抑制电网周期性扰动的特性,提出一种多谐振控制与重复控制级联的新型控制策略,通过设定谐波次数,更大程度降低并网电流中的谐波含量,实现无静差跟踪基波频率同时,改善并网电能质量,增强高频抗干扰能力,使得并网电流具有更好的稳态和动态性能。从理论和仿真实验方面验证了LCL逆变系统中新型控制策略对并网电流的控制作用以及对系统稳定性的影响。
In the LCL inverter grid-connected system, the occurrence of harmonics can lead to loss of power electronics,reduction efficiency of the motor and transformer, loss of capacitor heating and interference with communication control systems. After analyzing the LCL-type grid-connected inverter topology, this paper prevents the repetitive control based on multi-resonance control combining the advantage of the quasi-PR control which can realize the tracking without static tracking and the repeated control which can suppress the periodic disturbance of the grid voltage. The new control strategy of the joint reduces the harmonic content in the grid-connected current to a greater extent by setting the harmonic order,and tracks the fundamental frequency without static,and improves the power quality of the grid, and enhance the high-frequency anti-interference ability, the grid-connected current has better steady state and dynamic performance. From the theoretical and simulation experiments, the control effect of the new control strategy on the grid-connected current in the LCL-type inverter system and its influence on the stability of the system are verified.
In the LCL inverter grid-connected system, the occurrence of harmonics can lead to loss of power electronics,reduction efficiency of the motor and transformer, loss of capacitor heating and interference with communication control systems. After analyzing the LCL-type grid-connected inverter topology, this paper prevents the repetitive control based on multi-resonance control combining the advantage of the quasi-PR control which can realize the tracking without static tracking and the repeated control which can suppress the periodic disturbance of the grid voltage. The new control strategy of the joint reduces the harmonic content in the grid-connected current to a greater extent by setting the harmonic order,and tracks the fundamental frequency without static,and improves the power quality of the grid, and enhance the high-frequency anti-interference ability, the grid-connected current has better steady state and dynamic performance. From the theoretical and simulation experiments, the control effect of the new control strategy on the grid-connected current in the LCL-type inverter system and its influence on the stability of the system are verified.
引文
[1]马艺玮,杨苹,王月武,等.微电网典型特征及关键技术[J].电力系统自动化,2015(8):168-175
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[11]张学广,马彦,李瑞,等.两相静止坐标系下并网逆变器的重复控制策略[J].电工技术学报,2016,31(9):85-91
[12]Almeida PM,Barbosa PG,Oliveira JG,et al.Digital proportional multi-resonant current controller for improving grid-connected photovoltaic syetems[J].Renewable energy,2015,76:662-669
[2]王成山,李琰,彭克.分布式电源并网逆变器典型控制方法综述[J].电力系统及其自动化学报,2012,24(2):12-20
[3]Lowry OH,Rosebrough NJ,Farr AL,et al.Protein measurement with the Fooling phenol reagent[J].J Boil Chem,1951,93(3):265-275
[4]Karshenas HR,Saghafi H.Basic criteria in designing LCL filters for grid connected converters[C].Montreal,Canada:IEEE International Symposium on Industrial Electronics,2006:1996-2000
[5]Reznik A,Simes MG,Durra AA,et al.LCL filter design and performance analysis for grid-interconnected systems[J].IEEE Trans.on Industry Applications,2014,50(2):1225-1232
[6]谢震,汪兴,张兴,等.基于谐振阻尼的三相LCL型并网逆变器谐波抑制优化策略[J].电力系统自动化,2015,39(24):96-103
[7]赵爽,刘飞,孙建军,等.基于改进PR控制器的新能源并网检测平台设计[J].电力系统保护与控制,2015,43(16):118-125
[8]姜一鸣,姚俊涛,刘飞,等.考虑电网频率偏差的并网逆变器多内模重复控制[J].电力系统保护与控制,2016,44(21):144-149
[9]张兴,汪杨俊,余畅舟,等.采用PI+重复控制的并网逆变器控制耦合机理及其抑制策略[J].中国电机工程学报,2014,34(30):5287-5295
[10]郭小强.光伏并网逆变器通用比例复数积分控制策略[J].中国电机工程学报,2015,35(13):3393-3399
[11]张学广,马彦,李瑞,等.两相静止坐标系下并网逆变器的重复控制策略[J].电工技术学报,2016,31(9):85-91
[12]Almeida PM,Barbosa PG,Oliveira JG,et al.Digital proportional multi-resonant current controller for improving grid-connected photovoltaic syetems[J].Renewable energy,2015,76:662-669