Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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新型電力系統(tǒng)中構(gòu)網(wǎng)型逆變器并聯(lián)的動(dòng)態(tài)相互作用研究

來(lái)源:電工電氣發(fā)布時(shí)間:2025-07-25 08:25 瀏覽次數(shù):9

新型電力系統(tǒng)中構(gòu)網(wǎng)型逆變器并聯(lián)的動(dòng)態(tài)相互作用研究

韓翔宇,寇志豪
(國(guó)網(wǎng)四川省電力公司成都供電公司,四川 成都 610000)
 
    摘 要:針對(duì)新型電力系統(tǒng)中并聯(lián)構(gòu)網(wǎng)型逆變器間的動(dòng)態(tài)交互作用及其可能引發(fā)的振蕩失穩(wěn)問(wèn)題,提出了一種基于 s 域?qū)Ъ{模型的特征值分析方法,將系統(tǒng)中的各電路元件及逆變器控制單元等效為阻抗模型,并構(gòu)建了五節(jié)點(diǎn)電路網(wǎng)絡(luò),再通過(guò)特征值分析揭示了并聯(lián)逆變器交互作用下可能存在的諧振失穩(wěn)模態(tài)。研究重點(diǎn)分析了輸電線路長(zhǎng)度、虛擬阻抗控制環(huán)節(jié)以及電壓前饋單元對(duì)系統(tǒng)穩(wěn)定性的影響機(jī)制,研究結(jié)果表明:虛擬阻抗控制對(duì)系統(tǒng)諧振特性的影響可忽略;電壓前饋單元具有顯著的諧振抑制作用。通過(guò)時(shí)域仿真驗(yàn)證了理論分析的結(jié)果,為構(gòu)網(wǎng)型逆變器并網(wǎng)系統(tǒng)的穩(wěn)定性設(shè)計(jì)與優(yōu)化提供了理論依據(jù)。
    關(guān)鍵詞: 新型電力系統(tǒng);構(gòu)網(wǎng)型逆變器;導(dǎo)納模型;虛擬阻抗;特征值分析
    中圖分類(lèi)號(hào):TM464 ;TM711     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2025)07-0015-07
 
Dynamic Interaction Study of the Grid-Forming Inverters Parallel
Connection in New Power Systems
 
HAN Xiang-yu, KOU Zhi-hao
(State Grid Sichuan Electric Power Company Chengdu Power Supply Company, Chengdu 610000, China)
 
    Abstract: Aiming at the dynamic interaction between parallel grid-forming inverters in the new power system and the potential oscillation instability problems, this paper proposes an eigenvalue analysis method based on the s-domain admittance model. It first equivalents all circuit components in the system and inverter control units to impedance models, then constructs a five- node circuit network, and finally reveals the possible resonant instability modes under the interaction of parallel inverters through eigenvalue analysis. The research focuses on analyzing the influence mechanism of transmission line length, virtual impedance control, and voltage feed forward units on system stability.Results show that virtual impedance control has a negligible effect on system resonance characteristics, while voltage feed forward units can effectively suppress resonance. Time-domain simulations verify the theoretical analysis, offering a theoretical basis for the stability design and optimization of grid-connected systems with grid-forming inverters.
    Key words: new power system; grid-forming inverter; admittance model; virtual impedance; eigenvalue analysis
 
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