Abstract
In this study, a distributed secondary control is proposed alongside the conventional primary control to form a hierarchical control scheme for the Low Voltage Ride-Through (LVRT) control and applications in the inverter-based microgrid. The secondary control utilizes a fast Delayed Signal Cancelation (DSC) algorithm for the secondary control loop to control the reactive and active power reference by controlling the sequences generated. The microgrid consists of four Distributed Energy Resources (DER) sources interfaced to the grid through interfacing inverters coordinated by droop for effective power-sharing according to capacities. The droop also allows for grid supporting application for microgrid’s participation in frequency and voltage regulation in the main grid. The proposed decentralized fast DSC performance is evaluated with centralized secondary and traditional primary control using OPAL-RT Lab computation and MATLAB/SIMULINK graphical user interface for offline simulations and real-time digital simulator verification. This study presents and discusses the results.
Highlights
To date, a significant number of systems for the production of renewables have been developed to augment power shortages and resolve ecological issues
This study makes the following contributions: 1. The present study proposes a decentralized secondary level of control to address the collective fault ride-through (FRT) of aggregated Distributed Energy Resources (DER) operating in a microgrid context during a sag in voltage occasioned by grid transients, thereby ensuring that the individual DER participates in grid dynamic voltage support amidst accurate reactive power-sharing
These inverters are critical to operation and microgrid performance
Summary
A significant number of systems for the production of renewables have been developed to augment power shortages and resolve ecological issues. The present study proposes a decentralized secondary level of control to address the collective FRT of aggregated DERs operating in a microgrid context during a sag in voltage occasioned by grid transients, thereby ensuring that the individual DER participates in grid dynamic voltage support amidst accurate reactive power-sharing. The positive and negative component voltage-independent control is done in conformity with their respective sequence references is expressed in Eq 18: voltage sag depth with the complex power limit of the interfacing inverter to forestall overloading. This constraint is considered in developing the LVRT scheme, active power curtailment, and operation of the inverterbased microgrid.
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