Event Manager and Control Structure for High Performance Three-Phase Grid-tied Inverters

This paper presents a time and event based control strategy that guarantees the connection and operation of the grid-tied inverter to the IEEE 1547-2018 standard. The control structure is composed by a synchronization algorithm and current controller with active damping based on capacitor current estimation. This structure guarantees the high performance of the real time control presented in this paper. Moreover, the proposed control structure also includes the distributed generation (DG) manager, which is responsible for determining the operation mode of DG system: Connection; Active power limitation (Normal operation); Reactive power limitation; Dispatch interruption; and, Disconnection. Besides, flow charts are presented in order to describe the connection and disconnection procedures, as well the modes of operation. The proposed strategy is implemented in a DSP (Digital Signal Processor) connected to a Hardware in the Loop (HIL) system. Real time domain emulations are performed considering a 15 kW three-phase grid-tied inverter and the results are discussed.