组合式非隔离型三相逆变器由3个采用Heric拓扑的单相逆变器组成,每相均可独立运行。为解决组合式非隔离型三相逆变器离网运行时,由于三相所带负载不对称导致的逆变器输出电压不平衡问题,提出一种基于组合式非隔离型三相逆变器的改进下垂控制策略。将传统的有功-频率（P-f）下垂曲线替换为神经网络激活函数反平方根曲线（ISRU）,寻找有功中间相Pmid和无功中间相Qmid以改进有功-频率（P-f）和无功-电压（Q-U）下垂曲线,从而得到三相平衡参考电压,同时引入电压幅值补偿环节进一步确保输出电压的对称性。在Matlab/Simulink以及StarSim HIL半实物平台中验证所提控制策略的正确性与可行性,结果表明该策略具有良好的控制性能,同时能有效减小输出电压的不平衡度。
Abstract
The combined non-isolated three-phase inverter consists of three single-phase inverters using a Heric topology, each of which can operate independently. To solve the problem of unbalanced output voltage of a combined non-isolated three-phase inverter during off grid operation due to asymmetric load carried by the three-phase, an improved droop control strategy based on the combined non-isolated three-phase inverter is proposed. Replace the traditional active-frequency （P-f） droop curve with the inverse square root unit （ISRU） curve of the neural network activation function, search for the active intermediate phase Pmid and the reactive intermediate phase Qmid to improve the active-frequency （P-f） and reactive-voltage （Q-U） droop curves, thereby obtaining a three-phase balanced reference voltage. Meanwhile, introduce voltage amplitude compensation to further ensure the symmetry of the output voltage. The correctness and feasibility of the proposed control strategy were verified in Matlab/Simulink and StarSim HIL semi-physical platform. The results indicate that the strategy has good control performance and can effectively reduce the unbalance degree of output voltage.
关键词
下垂控制 /
不平衡负载 /
非隔离型 /
组合式三相逆变器 /
电压不平衡度
Key words
droop control /
unbalanced load /
non-isolated /
three-phase combined inverter /
unbalance degree of voltage
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 申永鹏, 刘洋, 王帅兵, 等. T型三电平逆变器非对称矢量脉冲宽度调制相电流重构策略[J]. 太阳能学报, 2024, 45(4): 450-459.
SHEN Y P, LIU Y, WANG S B, et al.Reconstruction strategy of asymmetric vector pulse width modulation phase current of T-type three-level inverter[J]. Acta energiae solaris sinica, 2024, 45(4): 450-459.
[2] 石存玮. 逆变器的三相不平衡负载控制方法研究[D]. 成都: 西南交通大学, 2014.
SHI C W.Research on the control method of three-phase inverter under unbalanced loads[D]. Chengdu: Southwest Jiaotong University, 2014.
[3] 张丹. 组合式多功能三相逆变器及其控制策略研究[D]. 马鞍山: 安徽工业大学, 2016.
ZHANG D.Research on the design control method of combined multi-function three-phase inverter[D]. Maanshan: Anhui University of Technology, 2016.
[4] 陈红兵, 张兴, 朱云国, 等. 太阳能四桥臂并网逆变器电流控制策略的研究[J]. 太阳能学报, 2013, 34(7): 1153-1159.
CHEN H B, ZHANG X, ZHU Y G, et al.Research on current control strategy for solar energy four-leg grid-connected inverter[J]. Acta energiae solaris sinica, 2013, 34(7): 1153-1159.
[5] 王立乔, 邢晓珊, 管成功. 一种单相非隔离可抑制漏电流的升降压型逆变器[J]. 太阳能学报, 2023, 44(9): 141-150.
WANG L Q, XING X S, GUAN C G.Single-phase non-isolated buck-boost inverter with leakage current suppression[J]. Acta energiae solaris sinica, 2023, 44(9): 141-150.
[6] 唐树中. 一种带飞跨电容的组合式三相无漏电流光伏逆变器研究[D]. 南京: 南京邮电大学, 2023.
TANG S Z.Research on a combined three-phase leakage-free photovoltaic inverter with flying capacitor[D]. Nanjing: Nanjing University of Posts and Telecommunications, 2023.
[7] 孙国文, 赵徐成, 刘章龙. 基于组合式拓扑的三相逆变电路设计与仿真[J]. 装备制造技术, 2017(6): 194-196.
SUN G W,ZHAO X C,LIU Z L.Design and simulation of three-phase inverter circuit based on combined topology[J]. Equipment manufacturing technology, 2017(6): 194-196.
[8] ZHONG Q C.Robust droop controller for accurate proportional load sharing among inverters operated in parallel[J]. IEEE transactions on industrial electronics, 2013, 60(4): 1281-1290.
[9] ROWE N C, SUMMERS J T, BETZ E R, et al.Arctan power-frequency droop for improved microgrid stability[J]. IEEE transactions on power electronics, 2013, 28(8): 3747-3759.
[10] 任碧莹, 赵欣荣, 孙向东, 等. 不平衡负载下基于改进下垂控制策略的组合式三相逆变器控制[J]. 电网技术, 2016, 40(4): 1163-1168.
REN B Y, ZHAO X R, SUN X D, et al.Improved droop control based three-phase combined inverters for unbalanced load[J]. Power system technology, 2016, 40(4): 1163-1168.
[11] 陈伟, 肖飞, 王恒利, 等. 不平衡负载时三相逆变器控制方法研究[J]. 电力电子技术, 2014, 48(6): 15-17.
CHEN W, XIAO F, WANG H L, et al.Study of control method for three-phase inverter with unbalanced load[J]. Power electronics, 2014, 48(6): 15-17.
[12] 鲍薇, 胡学浩, 李光辉, 等. 独立型微电网中基于虚拟阻抗的改进下垂控制[J]. 电力系统保护与控制, 2013, 41(16): 7-13.
BAO W, HU X H, LI G H, et al.An improved droop control strategy based on virtual impedance in islanded micro-grid[J]. Power system protection and control, 2013, 41(16): 7-13.
[13] 权建洲, 尹周平, 熊有伦, 等. 大功率组合式三相逆变器对称输出控制[J]. 电工技术学报, 2008, 23(8): 80-85.
QUAN J Z, YIN Z P, XIONG Y L, et al.Symmetrical output control for three-phase high power combined inverter[J]. Transactions of China Electrotechnical Society, 2008, 23(8): 80-85.
[14] 王建华,刘磊, 张方华, 等. 组合式三相逆变器锁相控制策略[J]. 电工技术学报, 2010, 25(8): 79-84.
WANG J H, LIU L, ZHANG F H, et al.Phase-locked control method for three-phase combined inverters[J]. Transactions of China Electrotechnical Society, 2010, 25(8): 79-84.
[15] 卢绍群, 田拥军, 钟坤炎. 基于组合三相逆变器的孤岛微电网电压平衡控制策略[J]. 电力电容器与无功补偿, 2021, 42(2): 168-175.
LU S Q, TIAN Y J, ZHONG K Y.Voltage balance control strategy of islanded microgrid based on combined three-phase inverter[J]. Power capacitor & reactive power compensation, 2021, 42(2): 168-175.
[16] 杨俊虎, 韩肖清, 曹增杰, 等. 基于逆变器下垂控制的微电网动态性能分析[J]. 南方电网技术, 2012, 6(4): 48-52.
YANG J H, HAN X Q, CAO Z J, et al.Analysis on the dynamic performance of microgrid based on droop control of inverters[J]. Southern power system technology, 2012, 6(4): 48-52.
[17] 毛欢. 计及三相不平衡的低压配电网电能质量评估与提升研究[D]. 南昌: 南昌大学, 2023.
MAO H.Research on power quality evaluation and improvement of low-voltage distribution network considering three-phase unbalance[D]. Nanchang: Nanchang University, 2023.
基金
四川省科技计划（2022SZYZF01）; 四川省氢能源与多能互补微电网工程技术研究中心项目（2024DWNY006）
PDF(12623 KB)
