Abstract
The fault current of voltage-controlled IIDGs is more serious than that of current-controlled inverters, which may affect the safety of power electronic devices seriously. Therefore, voltage-controlled IIDGs should be equipped with fault ride through (FRT) capability and have a reliable protection system. The studies on fault current and fault transient characteristics can help the design of optimal FRT strategies and protection systems. However, IIDGs response quite differently from SGs during fault period so that conventional fault current calculation methods cannot be fully applicable. This probably makes protection systems invalid and leads the failure of FRT strategies. Therefore, it is important to investigate inverter fault characteristics of voltage-controlled IIDGs. This chapter investigates the transient fault characteristics of three voltage controlled IIDGs, including V/f controlled IIDGs, droop controlled IIDGs and virtual synchronous generators (VSG). Firstly, the operation principles and control structures of the V/f control, droop control and virtual synchronous control are introduced. Then, the fault models and fault current mathematical expressions for three voltage-controlled IIDGs are introduced in detail. Finally, the main influencing factors of fault current are analyzed, covering control loops, fault type, line impedances, fault occurring moment and nonlinear limiters.
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Shuai, Z. (2021). Transient Characteristics of Voltage Controlled IIDGs During Grid Fault. In: Transient Characteristics, Modelling and Stability Analysis of Microgrid. Springer, Singapore. https://doi.org/10.1007/978-981-15-8403-9_3
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DOI: https://doi.org/10.1007/978-981-15-8403-9_3
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