RMS Modeling of Grid-Forming Power Electronics for Renewable Energy Power Plant Integration and Classical Power System Stability Studies
Authors
Thangamani, Theyagarajan ; Kucuk, Ibrahim
Term
4. term
Education
Publication year
2020
Pages
74
Abstract
Andelen af vedvarende energikilder i elsystemet stiger, og konventionelle kraftværker med store synkrongeneratorer tages ud af drift, hvilket giver bekymringer om stabiliteten. Mange VE-anlæg bruger netfølgende styring, som blot følger nettet og bidrager begrænset til stabilitet under forstyrrelser. Netdannende (grid-forming, GF) styring opfører sig derimod som en styret spændingskilde og kan fungere på en måde, der ligner en synkrongenerator. I dette studie opbygger vi en forenklet RMS-model af en GF-konverter og implementerer den i et simpelt elsystem forsynet af en vedvarende energikilde. Simulationer i DIgSILENT PowerFactory viser, at GF-konverteren kan opføre sig som en synkrongenerator og dele last i henhold til sin droop-kurve (en styremetode, der justerer frekvens eller spænding lidt med effekten for at fordele lasten mellem flere enheder). Derudover introducerer vi to adaptive droop-metoder til frekvenskontrol og foreslår at bruge et batterilager til at understøtte DC-spændingen ved øjeblikkelige effektbehov.
The share of renewable energy sources in power grids is increasing, and conventional plants with large synchronous generators are being retired, raising stability concerns. Many renewable units use grid-following control that simply tracks the grid and offers limited support during disturbances. Grid-forming (GF) control instead behaves like a controlled voltage source and can operate in a way similar to a synchronous generator. In this study, we build a simplified RMS model of a GF converter and implement it in a small test power system supplied by a renewable source. Simulations in DIgSILENT PowerFactory show that the GF converter can operate like a synchronous generator and share load according to its droop curve (a control rule that slightly adjusts frequency or voltage with power so multiple units can coordinate). We also introduce two adaptive droop methods for frequency control and propose using a battery storage system to support the DC voltage during sudden power demands.
[This abstract was generated with the help of AI]
Keywords
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