基于LSTM优化虚拟阻抗的光伏机组低电压穿越方法

满珈玮; 支月媚; 刘闯; 胡济恒; 张晖; 方璇

doi:10.19912/j.0254-0096.tynxb.2024-0397

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (7) : 636-644. DOI: 10.19912/j.0254-0096.tynxb.2024-0397

第二十七届中国科协年会学术论文

基于LSTM优化虚拟阻抗的光伏机组低电压穿越方法

满珈玮¹, 支月媚², 刘闯¹, 胡济恒², 张晖², 方璇²

作者信息 +

LOW VOLTAGE RIDE-THROUGH METHOD FOR PHOTOVOLTAIC UNITS BASED ON LSTM-OPTIMIZED VIRTUAL IMPEDANCE

Man Jiawei¹, Zhi Yuemei², Liu Chuang¹, Hu Jiheng², Zhang Hui², Fang Xuan²

Author information +

文章历史 +

摘要

针对短路故障引起的电网电压跌落易使逆变器产生功角失稳与过电流现象,提出一种基于长短时记忆网络（LSTM）优化虚拟阻抗的主动支撑型光伏机组低电压穿越方法。首先,结合光伏阵列出力特性提出光伏阵列的构网型主动支撑控制策略;其次,在传统虚拟同步发电机（VSG）技术的基础上引入暂态调压方程,构建同步发电机三阶模型;然后,在此基础上,通过故障判别器判断系统的运行状态确定投切虚拟阻抗的时间,并利用虚拟阻抗与光伏机组并网电压的关系结合基于LSTM的预测方法确定投切虚拟阻抗的大小;最后,基于DIgSILENT/PowerFactory电力系统仿真平台搭建光伏发电并网系统进行仿真验证,通过对比验证所提方法的优越性。

Abstract

In response to the voltage drops caused by short-circuit faults in the power grid, which can lead to power-angle instability and overcurrent phenomena in inverters, this paper proposes an active support low-voltage ride-through（LVRT）approach for photovoltaic （PV） units to traverse low voltage based on long short-term memory networks（LSTM） optimized virtual impedance. Firstly, a grid-forming active support control strategy for PV arrays is proposed by consider the output characteristics of the PV array. Secondly, transient voltage regulation equations are introduced based on traditional virtual synchronous generator（VSG） technology to construct a third-order synchronous generator model. Then, a fault discriminator is used to determine the operating state of the system and determine the switching time of the virtual impedance. The magnitude of the virtual impedance is determined by combining the relationship between the virtual impedance and the grid voltage of the PV unit using an LSTM-based prediction method. Finally, a PV grid-connected system is built on the DIgSILENT/PowerFactory power system simulation platform for validation. The superiority of the proposed method is demonstrated through comparative analyses.

导出引用

满珈玮, 支月媚, 刘闯, 胡济恒, 张晖, 方璇. 基于LSTM优化虚拟阻抗的光伏机组低电压穿越方法[J]. 太阳能学报. 2025, 46(7): 636-644 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0397

Man Jiawei, Zhi Yuemei, Liu Chuang, Hu Jiheng, Zhang Hui, Fang Xuan. LOW VOLTAGE RIDE-THROUGH METHOD FOR PHOTOVOLTAIC UNITS BASED ON LSTM-OPTIMIZED VIRTUAL IMPEDANCE[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 636-644 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0397

中图分类号： TM46

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