Active balancing optimized topology and voltage balancing control strategy for three-level inverters with mid-point potential
-
摘要: 针对T型三电平逆变器中点电位不平衡问题，研究了传统T型中点钳位型(NPC)三电平逆变器中点电位不平衡的形成原理。为解决直流侧电压变化导致的中点电位不平衡问题，提出一种主动平衡中点电位的改进拓扑和模糊PI控制策略。利用Matlab/Simulink建立改进拓扑的T型三电平逆变器的仿真模型，开展不同控制策略的仿真分析，并搭建相应的并网试验平台验证方案的合理性。仿真和试验结果表明，改进拓扑下模糊PI控制能有效抑制中点电压波动，兼具动态响应快、响应精度高等优点，可提高逆变器系统的抗扰性和稳定性。Abstract: Aiming at the problem of unbalanced mid-point potential in T-type three-level inverters, the principle of unbalanced mid-point potential in traditional T-type neutral point clamped (NPC) three-level inverters was investigated. To address the mid-point potential imbalance caused by voltage variation on DC side, an optimized topology with an active mid-point potential balancing strategy and a fuzzy PI control were proposed. A simulation system model of the optimized topology T-type three-level inverter was established by Matlab/Simulink, simulation analyses with different control strategies were conducted, and a grid-connected experimental platform was set up to validate the proposed methodology. The simulation and experimental results demonstrate that the fuzzy PI control under the optimized topology can effectively suppress the mid-point voltage fluctuations, with the advantages of fast dynamic response and high response precision, enhancing the disturbance resistance and stability of the inverter system.
-
图 2 T型三电平逆变器改进拓扑结构
Figure 2. Optimized topology structure of T-type three-level inverter
图 4 均衡电路双闭环控制结构框图
Figure 4. Double closed loop control structure block diagram of balancing circuit
图 7 电压电流双环的模糊控制系统模型
Figure 7. Fuzzy control system model of voltage and current double loop
图 10 电容电压扰动60 V时的动态响应
Figure 10. Dynamic response when capacitance voltage is disturbed at 60 V
表 1 模糊规则表
Table 1. Fuzzy rule
系数
变化量e ec NB NS Z PS PB $ \Delta {K_{\mathrm{p}}} $ NB PB PB PS PS Z NS PB PS PS Z Z Z PS Z Z Z NS PS Z Z NS NS NB PB Z NS NS NB NB $ \Delta {K_{\mathrm{i}}} $ NB NB NB NS NS Z NS NB NS NS Z Z Z NS Z Z Z PS PS Z Z PS PS PB PB Z PS PS PB PB 
下载: 导出CSV
表 2 仿真电路参数
Table 2. Simulation circuit parameters
参数名称 参数值 直流侧电压 U/V 1500 直流侧母线电容 C1、 C2/μF 450 电感 L/mH 1 直流侧负载电阻 R/Ω 0.1 上下母线电容带电初始值/V 100
下载: 导出CSV
-
[1] 闫涛, 渠展展, 刘赟甲, 等. 新型中点钳位三电平电池储能变流器设计及控制系统[J] . 电力系统自动化,2015,39(3):103 − 109. doi: 10.7500/AEPS20130821001 [2] 邢相洋, 陈阿莲, 张子成, 等. 并联T型三电平逆变器环流抑制和中点平衡研究[J] . 中国电机工程学报,2016,36(14):3909 − 3920. [3] SCHWEIZER M, KOLAR J W. Design and implementation of a highly efficient three-level T-type converter for low-voltage applications[J] . IEEE Transactions on Power Electronics,2013,28(2):899 − 907. doi: 10.1109/TPEL.2012.2203151 [4] PARK Y, SUL S K, LIM C H, et al. Asymmetric control of DC-link voltages for separate MPPTs in three-level inverters[J] . IEEE Transactions on Power Electronics,2013,28(6):2760 − 2769. doi: 10.1109/TPEL.2012.2224139 [5] 郭小强, 张学, 卢志刚, 等. 不平衡电网电压下光伏并网逆变器功率/电流质量协调控制策略[J] . 中国电机工程学报,2014,34(3):346 − 353. [6] 宋文祥, 陈国呈, 武慧, 等. 一种具有中点电位平衡功能的三电平空间矢量调制方法及其实现[J] . 中国电机工程学报,2006(12):95 − 100. doi: 10.3321/j.issn:0258-8013.2006.12.017 [7] 张晓华, 葛兴来. 基于SHEPWM的三电平NPC逆变器中点电位平衡控制算法[J] . 电力系统自动化,2017,41(16):144 − 150. doi: 10.7500/AEPS20161212005 [8] 陈兮, 黄声华, 李炳璋, 等. 一种零序注入的三电平中点钳位型变换器中点电位平衡控制策略[J] . 电工技术学报 , 2019, 34(2) : 337−348. [9] 周冠卿, 张国荣, 解润生, 等. 改进的三电平逆变器变虚拟空间矢量调制策略[J/OL] . 电力系统自动化 . (2022−10−26)[2022−12−25] . https://kns.cnki.net/kcms/detail/32.1180.TP.20221025.1008.007.html. [10] STALA R, PIROG S, BASZYNSKI M, et al. Results of investigation of multicell converters with balancing circuits: past one[J] . IEEE Transactions on Industrial Electronics,2009,56(7):2620 − 2628. [11] 陈鹏飞, 唐芬, 吴学智, 等. 三电平并网变流器中点电位自平衡特性分析及拓扑改进[J] . 电力系统自动化,2019,43(24):171 − 180. doi: 10.7500/AEPS20190226002 [12] 张泽, 李蔚, 黄权威, 等. 轨道车辆三电平中点自平衡电路拓扑研究[J] . 铁道科学与工程学报,2022,19(1):256 − 264. doi: 10.19713/j.cnki.43-1423/u.t20210069 [13] 陈鹏飞, 唐芬, 赵宇明, 等. 载波交替层叠调制下三电平变流器中点自平衡能力分析与改进拓扑[J] . 电网技术,2021,45(2):758 − 769. doi: 10.13335/j.1000-3673.pst.2019.1964 [14] 黄英怀. 电力系统分析综合程序的用户自定义模型[J] . 广东电力,2002(5):46 − 48. doi: 10.3969/j.issn.1007-290X.2002.05.015 [15] 宋文祥, 陈国呈. 三电平中点箝位式逆变器SVPWM方法的研究[J] . 电工电能新技术,2004(4):30 − 33. doi: 10.3969/j.issn.1003-3076.2004.04.007 [16] 戴铭言, 许留伟, 吴亚楠, 等. 基于模糊控制的VSVPWM中点电位平衡策略[J] . 核聚变与等离子体物理,2022,42(4):418 − 425. doi: 10.16568/j.0254-6086.202204010 [17] ZADEH L A. Fuzzy sets versus probability[J] . Proceed-ings of the IEEE,1980,68(3):421. doi: 10.1109/PROC.1980.11670 -
下载:
点击查看大图
计量
- 文章访问数: 6
- HTML全文浏览量: 4
- PDF下载量: 1
- 被引次数: 0
