ILADRC resonance suppression control strategy for multiple parallel photovoltaic energy storage GFL VSG microgrid

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Zuobin Zhu, Shumin Sun, Shaoping Huang
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引用次数: 0

Abstract

High proportion of distributed photovoltaic integration into power system has led to power system presenting weak or extremely weak power grid state. Under weak power grid or grid harmonic background high penetration distributed photovoltaic GFL converters are prone to lead to system instability. To suppress distributed photovoltaics grid connection resonance, ILADRC method multiple parallel photovoltaic storage GFL VSG system control strategy is proposed. Firstly, stability analysis of single photovoltaic energy storage GFL VSG system and multiple parallel photovoltaic energy storage GFL VSG system is, respectively, performed. Through impedance stability analysis, it can be concluded that multiple parallel photovoltaic energy storage GFL VSG system is prone to resonance in weak power grid or grid harmonic background. Secondly, to suppress system resonance, ILADRC GFL VSG controller is designed, and ILADRC photovoltaic energy storage GFL VSG system impedance model is established for stability analysis. System output impedance amplitude of LADRC method is larger than that of LADRC/unimproved method, and it has a stronger ability to attenuate harmonics in the power grid. Finally, ILADRC multiple parallel photovoltaic energy storage GFL VSG simulation model and hardware in the loop experimental platform are established for tests. By tests shows that harmonic content of unimproved method system is, respectively, as high as 26.57% and 24.29% under weak power grid and grid harmonic background, LADRC method system harmonic content is, respectively, 6.78% and 10.57% under weak current and grid harmonic background, ILADRC method system harmonic content is, respectively, reduced to 1.55% and 2.55% under weak power and grid harmonic background. This indicates ILADRC method system has better resonance suppression ability under weak current net or grid harmonic background, compared to LADRC/unimproved method.

Abstract Image

多并联光伏储能 GFL VSG 微电网的 ILADRC 共振抑制控制策略
高比例的分布式光伏发电并入电力系统,导致电力系统呈现弱电网或极弱电网状态。在弱电网或电网谐波背景下,高渗透率分布式光伏 GFL 变流器容易导致系统不稳定。为抑制分布式光伏并网谐振,提出了ILADRC方法多并联光伏储能GFL VSG系统控制策略。首先,分别对单光伏储能 GFL VSG 系统和多并联光伏储能 GFL VSG 系统进行了稳定性分析。通过阻抗稳定性分析,可以得出结论:多路并联光伏储能 GFL VSG 系统在弱电网或电网谐波背景下容易发生共振。其次,为抑制系统谐振,设计了 ILADRC GFL VSG 控制器,并建立了 ILADRC 光伏储能 GFL VSG 系统阻抗模型进行稳定性分析。LADRC方法的系统输出阻抗幅值大于LADRC/未改进方法的系统输出阻抗幅值,对电网谐波的衰减能力更强。最后,建立了 ILADRC 多并联光伏储能 GFL VSG 仿真模型和硬件在环实验平台进行测试。通过测试表明,在弱电网和电网谐波背景下,未改进方法系统的谐波含量分别高达 26.57% 和 24.29%;在弱电流和电网谐波背景下,LADRC 方法系统的谐波含量分别为 6.78% 和 10.57%;在弱电和电网谐波背景下,ILADRC 方法系统的谐波含量分别降至 1.55% 和 2.55%。这表明,与 LADRC/未改进方法相比,ILADRC 方法系统在弱电网或电网谐波背景下具有更好的谐振抑制能力。
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来源期刊
Electrical Engineering
Electrical Engineering 工程技术-工程:电子与电气
CiteScore
3.60
自引率
16.70%
发文量
0
审稿时长
>12 weeks
期刊介绍: The journal “Electrical Engineering” following the long tradition of Archiv für Elektrotechnik publishes original papers of archival value in electrical engineering with a strong focus on electric power systems, smart grid approaches to power transmission and distribution, power system planning, operation and control, electricity markets, renewable power generation, microgrids, power electronics, electrical machines and drives, electric vehicles, railway electrification systems and electric transportation infrastructures, energy storage in electric power systems and vehicles, high voltage engineering, electromagnetic transients in power networks, lightning protection, electrical safety, electrical insulation systems, apparatus, devices, and components. Manuscripts describing theoretical, computer application and experimental research results are welcomed. Electrical Engineering - Archiv für Elektrotechnik is published in agreement with Verband der Elektrotechnik Elektronik Informationstechnik eV (VDE).
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