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Since the photovoltaic power generation, wind power and other distributed power supply are volatile and random, they will affect the stability of the grid frequency. In order to improve the voltage and frequency in micro-grid, the virtual synchronous generator control strategy is proposed for inverter control, which can emulate the behavior of synchronous generator, decrease rate of change of frequency...
Distributed ac power systems using inverters connected in parallel are becoming increasingly widespread with the development of autonomous microgrids. Inverters can be controlled to emulate the dynamics of nonlinear oscillators, such that multiple inverters coupled through an electrical network will synchronize and share load in proportion to their ratings. In this paper, a communication-less control...
Microgrids are key elements to integrate renewable and distributed energy resources as well as distributed energy storage systems. In the last years, efforts toward the standardization of these microgrids have been made. In this sense, this paper presents the hierarchical control which consist of three levels: i) the primary control is based on the droop method, including an output impedance virtual...
DC and AC microgrids are key elements to integrate renewable and distributed energy resources as well as distributed energy storage systems. In the last years, efforts toward the standardization of these microgrids have been made. In this sense, this paper present the hierarchical control derived from ISA-95 and electrical dispatching standards to endow smartness and flexibility to microgrids. The...
This paper presents a practical control method for parallel operation of voltage source inverter modules with equal load sharing of the inter-connected modules. The main focus of the paper centers on control methodology for achieving precise phase synchronization for equal load sharing with minimum current circulation between the paralleled power converter modules, robust dynamics system control under...
In this paper, a low cost and high reliability control scheme is proposed for 400 Hz UPS system operated in parallel.The proposed control scheme is consisted of two parts which are synchronization and load sharing control. The synchronization control is achieved by discrete logic ICs and analog circuit. The load sharing control is realized by current transformers (CTs) without any controller. Therefore,...
A novel digital current sharing scheme for inverters parallel operation is proposed and discussed. The new scheme is based on controller area network (CAN). This scheme eliminates the circumfluence which is produced by the difference of inverters' voltage amplitudes. A key feature of the scheme is that it uses CAN to transmit parameters among inverters. It is important in high reliability inverters...
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