Abstract
This paper proposes an interactive control algorithm for seamless transfer of three-phase grid-connected converter between grid-tide mode and stand-alone mode. In order to archive a smooth transfer between two modes, the voltage controller and current controller are designed to generate the output voltage reference of PWM with no interrupted transition during islanding operation and grid connected operation. Additionally, a suitable phaselocked loop (PLL) algorithm is posed to obtain the phase angle of grid voltage continuously during operation time even if the utility outages. With the proposed algorithm, the control algorithm guarantees a smooth profile voltage across the local load when the grid is being disconnected or reconnected. In this paper, the simulation and experiment results verify the proposed method.
Highlights
Islanding operation occurs when DG system is disconnected from the main remainder of power system
This paper proposes a control algorithm for seamless transfer of three-phase grid-interactive inverter between current-controlled and voltage controlled modes in unintentional islanding
The final dcquantities are utilized as command voltages for generating PWM voltages. In this grid-tied mode, Vdmc and Vqmc will be not changed because the voltage regulator is not operating; the output voltage at PCC are regulated by only Vdm and Vqm. 3.3 Current controller
Summary
Islanding operation occurs when DG system is disconnected from the main remainder of power system. The grid-connected inverter operates in voltage-controlled mode to regulate the local load during interruption of utility power. The transfer between two operation modes usually causes the current and voltage of local load spike during the switching process because the difference of two output controllers. An Indirect current control algorithm for seamless transfer of three-phase utility-interactive voltage source inverters is proposed in [11]-[12] by controlling the capacitor voltage can guarantee no transition between two modes but the indirect control system need to be adjusted the parameters of the controller when the working condition is changed by time, temperature. This paper proposes a control algorithm for seamless transfer of three-phase grid-interactive inverter between current-controlled and voltage controlled modes in unintentional islanding. The protective device ACSW presents the utility outages when any fault occurs inadvertently at any point of power system before the main bus
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