{"title":"A state-space average model of a three-level PV inverter for transient short-circuit currents analysis","authors":"Shuai Yuan, Bing Wen, Jian-Ying Zhang, Zhimin Li","doi":"10.1049/gtd2.13163","DOIUrl":null,"url":null,"abstract":"<p>This paper presents a state-space average model of a three-level photovoltaic (PV) inverter to understand short-circuit currents transient characteristics. Analytical solution of the model is also derived. The proposed model is validated with PV system controller hardware in-loop (HIL) test method. The errors between simulation and HIL tests results under various conditions are evaluated, testifying the validity of the proposed model. With the model and analytical solution, the decaying time constants of sub-transient and transient processes are derived, which shows that the time constants of a three-level PV inverter are not fixed and they vary with voltage dips. The analytical expression of short-circuit currents is also formulated. The findings from this study are essential to short-circuit current calculations of a power grid with large-scale PV plants, coordination of power system protections, and grid planning.</p>","PeriodicalId":2,"journal":{"name":"ACS Applied Bio Materials","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/gtd2.13163","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Bio Materials","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/gtd2.13163","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, BIOMATERIALS","Score":null,"Total":0}
引用次数: 0
Abstract
This paper presents a state-space average model of a three-level photovoltaic (PV) inverter to understand short-circuit currents transient characteristics. Analytical solution of the model is also derived. The proposed model is validated with PV system controller hardware in-loop (HIL) test method. The errors between simulation and HIL tests results under various conditions are evaluated, testifying the validity of the proposed model. With the model and analytical solution, the decaying time constants of sub-transient and transient processes are derived, which shows that the time constants of a three-level PV inverter are not fixed and they vary with voltage dips. The analytical expression of short-circuit currents is also formulated. The findings from this study are essential to short-circuit current calculations of a power grid with large-scale PV plants, coordination of power system protections, and grid planning.
本文提出了一个三电平光伏(PV)逆变器的状态空间平均模型,以了解短路电流的瞬态特性。同时还得出了该模型的解析解。提出的模型通过光伏系统控制器硬件在环(HIL)测试方法进行了验证。评估了各种条件下模拟和 HIL 测试结果之间的误差,证明了所提模型的有效性。通过模型和解析解,得出了亚瞬态和瞬态过程的衰减时间常数,这表明三电平光伏逆变器的时间常数并不是固定不变的,它们会随着电压骤降而变化。此外,还得出了短路电流的分析表达式。本研究的结论对于大规模光伏电站电网的短路电流计算、电力系统保护协调和电网规划至关重要。