Improved sliding mode active disturbance rejection control for grid-forming photovoltaic hybrid power conversion system

doi:10.3785/j.issn.1008-973X.2026.01.015

Journal of ZheJiang University (Engineering Science)

2026, Vol. 60

Issue (1): 158-168 DOI: 10.3785/j.issn.1008-973X.2026.01.015

Improved sliding mode active disturbance rejection control for grid-forming photovoltaic hybrid power conversion system

Yueming LIU(

),Jinfeng HUANG*(

),Zhenyang HU,Ruize XUE,Xing LI

School of Electrical Engineering, Shaanxi University of Technology, Hanzhong 723001, China

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Abstract

An improved sliding mode active disturbance rejection control strategy based on the quasi-continuous algorithm was proposed by utilizing the virtual synchronous generator (VSG) technology to address the issue that the traditional linear control strategy of photovoltaic hybrid power conversion system (PV-HPCS) was difficult to achieve ideal control effect in terms of power and voltage fluctuation suppression, and to improve the performance of PV-HPCS, to stabilize the power fluctuation of the grid and maintain the stability of bus voltage. The VSG was integrated with the dual closed-loop control strategy of voltage and current. The PI control was adopted in the voltage outer loop to provide reference values for the current inner loop. A high-order super-twisting sliding mode observer (HO-STSMO) which realized higher response speed and tracking accuracy was adopted in the current inner loop. The quasi-continuous integral terminal sliding mode controller (QC-ITSMC) was introduced in the form of dual sliding mode switching control law, and an improved exponential reaching law was designed to smooth the system control signal and improve the robustness of the system. The simulation model and experimental platform were built, and the experimental results showed that the improved control strategy effectively suppressed the power fluctuation of the grid and improved the stability of the system.

Key words： photovoltaic hybrid power conversion system virtual synchronous generator high-order super-twisting sliding mode observer quasi-continuous algorithm exponential reaching law

Received: 25 December 2024 Published: 15 December 2025

CLC:

TM 46

Fund: 陕西省自然科学研究资助项目（2023-JC-YB-442）；陕西理工大学研究生创新基金资助项目（SLGYCX2539）.

Corresponding Authors: Jinfeng HUANG E-mail: 2219240462@qq.com;jfhuang2000@163.com

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Cite this article:

Yueming LIU,Jinfeng HUANG,Zhenyang HU,Ruize XUE,Xing LI. Improved sliding mode active disturbance rejection control for grid-forming photovoltaic hybrid power conversion system. Journal of ZheJiang University (Engineering Science), 2026, 60(1): 158-168.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2026.01.015 OR https://www.zjujournals.com/eng/Y2026/V60/I1/158

构网型光伏混合储能变流器的改进滑模自抗扰控制

光伏混合储能变流器（PV-HPCS）的传统线性控制策略在功率及电压波动抑制方面难以达到理想控制效果. 为了提升光伏混合储能变流器的性能，平抑电网功率波动，维持母线电压稳定，基于虚拟同步发电机（VSG）技术，提出基于拟连续算法的改进滑模自抗扰控制策略. VSG与电压电流双闭环策略相配合. 在电压外环采用PI控制，为电流内环提供参考值；在电流内环采用高阶超螺旋滑模观测器（HO-STSMO），实现更优的响应速度与跟踪精度. 采用双滑模切换控制律形式，引入拟连续积分终端滑模控制器（QC-ITSMC），并设计改进指数趋近律，以平滑系统控制信号，提升系统鲁棒性. 搭建仿真模型和实验平台. 实验结果表明，改进控制策略有效抑制了电网功率波动，提高了系统运行稳定性.

关键词： 光伏混合储能变流器, 虚拟同步发电机, 高阶超螺旋滑模观测器, 拟连续算法, 指数趋近律

Fig.1 Main circuit topology of photovoltaic hybrid power conversion system

Fig.2 P-f speed control block diagram

Fig.3 Q-E excitation control block diagram

Fig.4 Comparison of hyperbolic function F(e_i) with sgn (x)

Fig.5 Comparison of sliding mode chattering and tracking error

Fig.6 Working principle of IQC-ITSMC

Fig.7 Current inner loop control block diagram

Fig.8 Control structure diagram of photovoltaic hybrid power conversion system

Tab.1 Circuit model parameters

Tab.2 Controller parameters

Fig.9 Output power of photovoltaic power supply under varying solar irradiance

Fig.10 Response of DC bus voltage under photovoltaic fluctuation

Fig.11 Transient response of system to sudden changes in active power command

Fig.12 Schematic diagram of HIL experimental platform

Fig.13 Experimental waveforms of bus voltage under photovoltaic fluctuation

Tab.3 Comparison of transient performance of bus voltage under photovoltaic fluctuation

Fig.14 Experimental waveforms of system response to abrupt power command changes

Tab.4 Transient performance comparison of system active power response to abrupt changes in active power command

Tab.5 Transient performance comparison of system voltage response to abrupt changes in active power command


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[1]	Jinfeng HUANG,Jie ZHOU,Hongjie HUANG. Control strategy of power conversion system based on sliding mode active disturbance rejection control[J]. Journal of ZheJiang University (Engineering Science), 2024, 58(10): 2171-2181.

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