考虑锁相环频率耦合效应的并网变流器稳定性控制

Energies Pub Date : 2024-07-12 DOI:10.3390/en17143438
Ye Zhang, Haibo Pen, Xiaoyu Zhang
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引用次数: 0

摘要

鉴于弱电网中的锁相环频率耦合效应(PLL-FCE)会降低输出电流波形的质量,给维持并网变流器(GCC)的稳定运行带来挑战,本文分析了弱电网下锁相环频率耦合效应、电网阻抗和并网变流器输出阻抗之间的耦合关系。本文阐明了上述耦合关系在系统稳定性中的作用,然后提出了一种稳定性优化控制方法。首先,本文探讨了在弱电网条件下运行的 GCC 的频率耦合现象及其耦合机制。通过使用小信号干扰进行分析,建立耦合导纳模型,阐明了 PLL-FCE 的重要性,尤其是在中低频范围内。其次,它提出了三相 LCL 型 GCC 的输出阻抗模型,并结合了 PLL 频率耦合的特性。该模型阐明了 GCC 输出阻抗、PLL-FCE 和电网阻抗之间的相互作用。它还揭示了 PLL-FCE 在弱电网情况下对系统稳定性的影响。基于这些见解,本文提出了一种基于二阶广义积分器 (SOGI) 的增强型 PLL。本文提供了实现这些改进型 PLL 结构的详细参数设计流程。最后,研究在弱电网条件下进行了仿真和实验验证。研究结果表明,PLL-FCE 确实会破坏弱电网中 GCC 的稳定性,随着电网阻抗的增加,这种影响会变得更加明显。然而,SOGI-PLL 的实施成功缓解了 PLL-FCE 对变流器-弱电网交互系统稳定性的不利影响,从而增强了 GCC 对弱电网环境的适应性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stability Control of Grid-Connected Converter Considering Phase-Locked Loop Frequency Coupling Effect
Given the problems that the phase-locked loop frequency coupling effect (PLL-FCE) in a weak grid reduces the quality of the output current waveform and brings challenges to maintaining a steady running of the grid-connected converter (GCC), this paper analyzes the coupling relationship between the FCE of the PLL, grid impedance and the output impedance of GCCs under a weak grid. It elucidates the role of the above coupling relationships in system stability and then proposes a stability optimization control method. Firstly, this paper delves into the frequency coupling phenomenon and its coupling mechanism in GCCs operating within weak grid conditions. Through analysis using small signal disturbance, it elucidates the significance of the PLL-FCE, particularly in medium- and low-frequency ranges, by establishing the coupling admittance model. Secondly, it presents the output impedance model for a three-phase LCL-type GCC, incorporating the characteristics of PLL frequency coupling. This model elucidates the interplay between the GCC’s output impedance, the PLL-FCE and the grid impedance. It also unveils the impact of the PLL-FCE on system stability in weak grid scenarios. Building upon these insights, this paper proposes an enhanced PLL based on the Second-Order Generalized Integrator (SOGI). It provides a detailed parameter design process for implementing these improved PLL structures. Finally, the study conducts simulation and experiment verification under weak grid conditions. The findings indicate that the PLL-FCE indeed undermines the stability of GCCs in the weak grid, with this effect becoming more pronounced as the grid impedance increases. However, the implementation of the SOGI-PLL successfully mitigates the adverse impact of the PLL-FCE on the stability of the converter–weak grid interactive system, thereby enhancing the adaptability of GCCs to weak grid environments.
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