LCL型并网逆变器临界无源阻尼参数设计

doi:10.12204/j.issn.1000-7229.2022.01.008

电力建设 ›› 2022, Vol. 43 ›› Issue (1): 70-77.doi: 10.12204/j.issn.1000-7229.2022.01.008

LCL型并网逆变器临界无源阻尼参数设计

陈伟¹(), 张岩¹(), 屠一鸣¹, 刘进军¹, 姜新生²

1.电力设备电气绝缘国家重点实验室(西安交通大学),西安市 710049
2.西安中车永电捷通电气有限公司,西安市 710016

收稿日期:2021-04-29 出版日期:2022-01-01 发布日期:2021-12-21
通讯作者: 张岩 E-mail:3120104222@stu.xjtu.edu.cn;zhangyanjtu@xjtu.edu.cn
作者简介:陈伟(1999),男,硕士研究生,主要研究方向为并网逆变器的建模、分析与控制,E-mail: 3120104222@stu.xjtu.edu.cn;
屠一鸣(1993),男,博士研究生,主要研究方向为新能源并网逆变器的阻抗建模、稳定性分析及改进;
刘进军(1970),男,博士,教授,主要研究方向为电力电子技术在电能质量控制、输配电系统以及分布式发电系统中的应用,电力电子电路和系统的建模、仿真、分析和控制;
姜新生(1976),男,高级工程师,主要从事轨道交通车辆牵引辅助变流器研发工作。
基金资助:
国家自然科学基金项目(51807152);国家自然科学基金项目(52177193)

Design of Critical Passive Damping Parameters for LCL-Type Grid-Connected Inverter

CHEN Wei¹(), ZHANG Yan¹(), TU Yiming¹, LIU Jinjun¹, JIANG Xinsheng²

1. State Key Laboratory of Electrical Insulation and Power Equipment (Xi’an Jiaotong University), Xi’an 710049, China
2. CRRC Xi’an Yongejietong Electric Co., Ltd., Xi’an 710016, China

Received:2021-04-29 Online:2022-01-01 Published:2021-12-21
Contact: ZHANG Yan E-mail:3120104222@stu.xjtu.edu.cn;zhangyanjtu@xjtu.edu.cn
Supported by:
National Natural Science Foundation of China(51807152);National Natural Science Foundation of China(52177193)

摘要/Abstract

摘要：

LCL滤波器因其良好的滤波性能被广泛应用于并网逆变器系统中。然而,LCL滤波器的固有谐振特性以及数字控制延时会严重危及系统稳定性。为提高系统鲁棒性,工程上通常采用无源阻尼方法以抑制滤波器谐振。由于滤波器谐振问题受多种因素影响,阻尼电阻的选取标准通常是模糊的。为准确、高效地设计阻尼电阻,文章结合阻尼电阻与滤波电容串联和与滤波电容并联两种典型无源阻尼方法,推导分析了“临界阻尼”指标。当系统阻尼大于临界阻尼时,LCL滤波器幅频特性曲线上的谐振峰被完全抑制,同时以最少的无源阻尼损耗为代价,充分保证了基于LCL滤波器的并网逆变器系统稳定性。此外,文章在PLECS软件中进行三相并网逆变器系统仿真,仿真结果验证了理论分析的有效性和正确性。

关键词: LCL型并网逆变器, 无源阻尼, 临界阻尼系数, 控制时间延时

Abstract:

LCL filter is widely used in grid-connected inverter system for its advanced filtering performance. However, the inherent resonance characteristic of LCL filter and digital control delay will seriously endanger system stability. To increase the system robustness, passive damping method is usually applied to suppress the filter resonance in engineering. Since the filter resonance problem is affected by many factors, the selection standard of damping resistor is unclear. In order to design the damping resistor accurately and efficiently, this paper introduces the index of“critical damping factor”and analyzes two typical passive damping methods: damping resistor in series with filter capacitor or in parallel with filter capacitor. When system damping factor is larger than the critical damping factor, the resonant peak of the amplitude frequency characteristic curve can be completely suppressed and the stability of grid-connected inverter system is fully guaranteed with the minimum cost of passive damping losses. Moreover, the simulation of three-phase grid-connected inverter is carried out in PLECS and the simulation results verify the effectiveness and correctness of the theoretical analysis.

Key words: LCL-type grid-connected inverter, passive damping, critical damping factor, control time delay

中图分类号:

TM76

陈伟, 张岩, 屠一鸣, 刘进军, 姜新生. LCL型并网逆变器临界无源阻尼参数设计[J]. 电力建设, 2022, 43(1): 70-77.

CHEN Wei, ZHANG Yan, TU Yiming, LIU Jinjun, JIANG Xinsheng. Design of Critical Passive Damping Parameters for LCL-Type Grid-Connected Inverter[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(1): 70-77.

图/表 10

图1 单闭环控制LCL型并网逆变器系统结构

Fig.1 System structure of the LCL-type grid-connected inverter with single closed-loop control

图2 LCL型并网逆变器电网电流单闭环控制框图

Fig.2 Block diagram of grid current single closed-loop control of LCL-type grid-connected inverter

图3 开环增益波特图

Fig.3 Bode diagram of open-loop gain

图4 六种无源阻尼方法

Fig.4 Six kinds of passive damping methods

图5 num(ζ,α)关于α的函数图像

Fig.5 Curves of num(ζ,α) against α

图6 阻尼系数为0.28时电阻与滤波电容串联无源阻尼策略开环增益波特图

Fig.6 Open-loop gain Bode diagram of resistor in series with capacitor damping strategy when damping factor is 0.28

图7 dN(ζ,α)/dα关于α的函数图像

Fig.7 Curves of dN(ζ,α)/dα against α

图8 阻尼系数为0.26时电阻与滤波电容并联无源阻尼策略开环增益波特图

Fig.8 Open-loop gain Bode diagram of resistor in parallel with capacitor damping strategy when damping factor is 0.26

表1 三相并网逆变器系统仿真参数

Table 1 Simulation parameters of three-phase grid-connected inverter system

图9 不同阻尼电阻与滤波电容串联时并网电流和电压仿真波形

Fig.9 Simulation waveforms of grid-connected current and voltage when different damping resistors are connected in series with filter capacitors

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LCL型并网逆变器临界无源阻尼参数设计

Design of Critical Passive Damping Parameters for LCL-Type Grid-Connected Inverter

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