基于改进模糊线性自抗扰的LCL型并网逆变器控制策略

doi:10.12096/j.2096-4528.pgt.24132

发电技术 ›› 2025, Vol. 46 ›› Issue (2): 409-420.DOI: 10.12096/j.2096-4528.pgt.24132

• 新型电力系统 • 上一篇

基于改进模糊线性自抗扰的LCL型并网逆变器控制策略

李航¹, 郭昆丽¹, 杨鹏¹, 吕家君¹, 任蓓蕾¹, 曲晨明¹, 朱婷华¹, 郝翊帆²

^1.西安工程大学电子信息学院，陕西省西安市 710600
^2.国网山西省电力公司运城供电公司，山西省运城市 044000

收稿日期:2024-07-05 修回日期:2024-10-08 出版日期:2025-04-30 发布日期:2025-04-23
作者简介:李航(2000)，男，硕士研究生，研究方向为并网逆变器控制，511793930@qq.com；
郭昆丽(1974)，女，硕士，副教授，研究方向为电力系统运行与控制、新能源发电技术，本文通信作者，705682757@qq.com；
杨鹏(1995)，男，博士，副教授，研究方向为新型电力系统的稳定性分析、控制与优化，p-yang@xpu.edu.cn。
基金资助:
国家自然科学基金项目(52407137);陕西省自然科学基础研究计划项目(2023-JC-QN-0391)

LCL Grid-Connected Inverters Control Strategy Based on Improved Fuzzy Linear Active Disturbance Rejection Control

Hang LI¹, Kunli GUO¹, Peng YANG¹, Jiajun LÜ¹, Beilei REN¹, Chenming QU¹, Tinghua ZHU¹, Yifan HAO²

^1.School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710600, Shaanxi Province, China
^2.Yuncheng Power Supply Company of State Grid Shanxi Electric Power Co. , Ltd. , Yuncheng 044000, Shanxi Province, China

Received:2024-07-05 Revised:2024-10-08 Published:2025-04-30 Online:2025-04-23
Supported by:
National Natural Science Foundation of China(52407137);Natural Science Basic Research Program of Shaanxi Province(2023-JC-QN-0391)

摘要/Abstract

摘要：

目的在复杂电网环境下，LCL型并网逆变器系统的传统控制方法存在并网电流质量不佳、动态性能较差和固有谐振尖峰等缺陷，为了解决这些问题，提出了改进模糊线性自抗扰控制(Fuzzy linear active disturbance rejection control，Fuzzy-LADRC)策略。方法通过改写传统线性扩张状态观测器的误差方程，增强抗干扰性能，并将改写后的误差方程与模糊逻辑控制相结合，对控制器参数进行自适应控制。将改进Fuzzy-LADRC策略应用于LCL控制系统中的锁相环和电流环，并采用Lyapunov稳定性分析和频域分析对系统的稳定性和抗扰性进行验证。最后，通过MATLAB/Simulink仿真验证该控制策略的有效性。结果改进Fuzzy-LADRC策略在3种工况下的并网电流谐波畸变率、偏移量以及动态响应时间均优于其他控制方法，此外，该控制策略无需额外的阻尼环节，简化了控制结构。结论改进Fuzzy-LADRC策略能够有效提高系统的抗扰能力和并网电流质量，节约系统成本，具有良好的动态性能，为LCL并网逆变器的控制应用提供了新思路。

关键词: 电网, 自抗扰控制, 并网逆变器, 模糊控制, 控制策略, 稳定性, 谐波, 畸变率

Abstract:

Objectives In complex grid environments, traditional control methods for LCL grid-connected inverter systems suffer from poor grid current quality, inadequate dynamic performance, and inherent resonance peaks. To address these issues, a Fuzzy linear active disturbance rejection control (Fuzzy-LADRC) strategy is proposed. Methods The disturbance rejection capability is enhanced by modifying the error equation of the traditional linear extended state observer. The modified error equation is then combined with fuzzy logic control to achieve adaptive control of the controller parameters. The improved Fuzzy-LADRC strategy is applied to both the phase-locked loop and the current loop of the LCL control system. The system’s stability and disturbance rejection performance are verified by using Lyapunov stability analysis and frequency-domain analysis. Finally, MATLAB/Simulink simulations are conducted to validate the effectiveness of the proposed control strategy. Results The improved Fuzzy-LADRC strategy shows superior performance in terms of grid current harmonic distortion, offset, and dynamic response time under three different operating conditions compared with other control methods. Additionally, this control strategy simplifies the control structure by eliminating the need for additional damping components. Conclusions The improved Fuzzy-LADRC strategy effectively improves the system’s disturbance rejection capability and grid current quality while reducing system costs and achieving good dynamic performance. It provides a new approach for the control of LCL grid-connected inverters.

Key words: power grid, active disturbance rejection control, grid-connected inverter, fuzzy control, control strategy, stability, harmonics, distortion rate

中图分类号:

TK 011

李航, 郭昆丽, 杨鹏, 吕家君, 任蓓蕾, 曲晨明, 朱婷华, 郝翊帆. 基于改进模糊线性自抗扰的LCL型并网逆变器控制策略[J]. 发电技术, 2025, 46(2): 409-420.

Hang LI, Kunli GUO, Peng YANG, Jiajun LÜ, Beilei REN, Chenming QU, Tinghua ZHU, Yifan HAO. LCL Grid-Connected Inverters Control Strategy Based on Improved Fuzzy Linear Active Disturbance Rejection Control[J]. Power Generation Technology, 2025, 46(2): 409-420.

图/表 20

图1 三相LCL并网逆变器系统框图

Fig. 1 Block diagram of three-phase LCL grid-connected inverter system

图2 三相LCL并网逆变器系统控制框图

Fig. 2 Control block diagram of three-phase LCL grid-connected inverter system

图3 LCL传递函数与降阶传递函数Bode图

Fig. 3 Bode plots of LCL transfer function and reduced-order transfer function

图4 改进一阶LADRC框图

Fig. 4 Block diagram of improved first-order LADRC

图5 改进LADRC简化系统框图

Fig. 5 Improve LADRC and simplified system block diagram

图6 基于LCL系统的改进LADRC等效控制框图

Fig. 6 Improved LADRC equivalent control block diagram based on LCL system

图7 基于改进LADRC的锁相环等效控制框图

Fig. 7 PLL equivalent control block diagram based on improved LADRC

图8 基于LCL系统的控制框图

Fig. 8 Control block diagram based on LCL System

图9 ω0和ωc变化的LCL系统输出bode图

Fig. 9 Output bode plot of LCL system with changes in ωc and ω0

图10 ω0和ωc变化的LCL系统扰动bode图

Fig. 10 Disturbance bode plot of LCL system with changes in ωc和ω0

图11 ω0和ωc变化的锁相环系统扰动bode图

Fig. 11 Disturbance bode plot of PLL system with changes in ωc and ω0

图12 LCL系统改进LADRC与传统LADRC对比

Fig. 12 Comparison of improved LADRC and traditional LADRC in LCL system

图13 锁相环改进LADRC与传统LADRC扰动对比图

Fig. 13 Comparison of disturbance between improved LADRC and traditional LADRC in PLL

图14 改进Fuzzy-LADRC框图

Fig. 14 Block diagram of improved Fuzzy-LADRC

表1 模糊控制规则

Tab. 1 Fuzzy control rules

$e$	$e ˙$
$e$	NL	NM	NS	ZO	PS	PM	PL
NL	PL	PL	PM	PM	PS	ZO	ZO
NM	PL	PL	PM	PM	PS	ZO	ZO
NS	PM	PM	PS	PS	ZO	ZO	NS
ZO	PM	PS	PS	ZO	NS	NS	NM
PS	PS	ZO	ZO	NS	NM	NM	NM
PM	ZO	ZO	NS	NM	NM	NL	NL
PL	ZO	NS	NM	NM	NL	NL	NL

表1 模糊控制规则

Tab. 1 Fuzzy control rules

$e$	$e ˙$
$e$	NL	NM	NS	ZO	PS	PM	PL
NL	PL	PL	PM	PM	PS	ZO	ZO
NM	PL	PL	PM	PM	PS	ZO	ZO
NS	PM	PM	PS	PS	ZO	ZO	NS
ZO	PM	PS	PS	ZO	NS	NS	NM
PS	PS	ZO	ZO	NS	NM	NM	NM
PM	ZO	ZO	NS	NM	NM	NL	NL
PL	ZO	NS	NM	NM	NL	NL	NL

表2 LCL系统参数

Tab. 2 LCL system parameters

参数	数值	参数	数值
U_dc/V	800	ω₀₁	3 000
电网电压/V	220	PI参数 $k p$	0.026
L₁/mH	2	PI参数 $k i$	167
L₂/mH	0.5	有源阻尼系数	0.4
C/ $μ F$	4.7	ω_c2	50
开关频率f_sw/kHz	10	ω₀₂	100
ω_c1	2 000	$b 0$	1

表2 LCL系统参数

Tab. 2 LCL system parameters

参数	数值	参数	数值
U_dc/V	800	ω₀₁	3 000
电网电压/V	220	PI参数 $k p$	0.026
L₁/mH	2	PI参数 $k i$	167
L₂/mH	0.5	有源阻尼系数	0.4
C/ $μ F$	4.7	ω_c2	50
开关频率f_sw/kHz	10	ω₀₂	100
ω_c1	2 000	$b 0$	1

图15 电流突增时不同控制策略下的并网电流

Fig. 15 Grid-connected current of different control strategies under sudden current surge

表3 不同控制策略下的并网电流偏移量 (A)

Tab. 3 Grid-connected current offset of different control strategies

控制策略	a相	b相	c相	总和
有源阻尼+PI	2.62	21.30	7.40	31.32
一阶LADRC	4.40	5.66	6.10	16.16
改进LADRC	2.34	2.76	3.15	8.25
改进Fuzzy-LADRC	1.06	1.46	0.88	3.40

图16 电网电压跌落时不同控制策略下的并网电流、电压

Fig. 16 Grid-connected current and voltage of different control strategies during grid voltage sag

图17 注入谐波时不同控制策略下的并网电流、电压

Fig. 17 Grid-connected current and voltage of different control strategies under harmonic injection

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基于改进模糊线性自抗扰的LCL型并网逆变器控制策略

LCL Grid-Connected Inverters Control Strategy Based on Improved Fuzzy Linear Active Disturbance Rejection Control

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