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Power Electronic Converters by Joonas Puukko, Tuomas Messo, Teuvo Suntio

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14Reduced-Order Closed-Loop Modeling of Inverters

14.1 Introduction

This chapter provides methods to develop closed-loop inverter models that include the dynamics of mostly used voltage and current control functions. Closed-loop models of voltage- and current-fed inverters are developed with L- and LCL-type output filters with passive components. Basic control functions such as AC current, DC voltage control, grid synchronization, that is, the SRF-PLL, and grid voltage feedforward are included in the dynamic model. Derivation of closed-loop model starts by studying the voltage-fed inverter with L-type filter since this is easiest to understand due to simple dynamic model. Derivation of more complex closed-loop models, such as current-fed ...

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