Abstract
The capacity of distributed generators (DGs) connected to grid by inverters is growing. The inverters are generally controlled by PLL (Phase Locked Loop) in order to synchronize with power system frequency. It cannot have synchronous power. Power systems will become unstable, if the capacity of inverter type DGs is increased. The concept that inverters are controlled to behave like a synchronous generator is studied in this paper, which is called “Virtual Synchronous Generator (VSG)”. VSG has synchronizing power. Power system becomes stable by VSG. VSG is useful for parallel operation of distributed generators. VSG can synchronize with other VSGs, synchronous generators or grid. In this paper the method of synchronous running for a VSG is studied and experimental result of the VSG which is running parallel with synchronous generator and other VSG is shown.
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