期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：237
期号：3
页码：032123
DOI：10.1088/1755-1315/237/3/032123
出版社：IOP Publishing
摘要：Cascaded STATCOM including huge number of sub-modules under higher voltage needs rapid modeling to analyze efficiently. This paper presents a discrete iterative algorithm based on equivalent modeling method, which can greatly simplify mathematical model of STATCOM under higher voltage. According to the mathematical properties of the sub-module DC capacitor, it is equivalent to a historical series branch voltage source with an equivalent resistance. By simplifying IGBT to equivalent variable resistor, H-bridge is simplified to an equivalent branch with PWMs. Control system can calculate each IGBT PWM pulse signal by embedding to the equivalent electric circuit. Created an iterative calculation algorithm for the equivalent circuit, and evaluated the two basic errors that are algorithm error and parameter error. By comparing ±100MVar STATCOM's waves between field data and simulation data, it is proved correct that the rapid equivalent modeling method. In-depth comparison of the key parameters of the theory and simulation instructions, it is very close between the theory and the practice, and methods can greatly simplify the analysis and simulation calculations.
