Optimal Dump Load Allocations in High RBDG Penetrated Microgrid for Voltage and Frequency Regulation

摘要

The rising renewable penetrations has paved ways for the microgrids to operate independent of the conventional centrallylocated power plants. At low load hours, the microgrid operation is often disrupted due the excess power generations creatingvoltage (V) and frequency (f) regulation issues. The use of energy storage devices to absorb such excess generations wouldbe infeasible due to their less usability, high cost and uneconomical trading. The offline planning of distributing dump loads(DLs) in the network can coordinate with the online control in maintaining V and f of the system. Thus, the present workprovides an offline analysis to optimally allocate DLs in the power electronic (PE) interfaced DGs powered autonomousmicrogrid to minimize the V and f deviations at off-peak hours. The V and f deviations as per the droop characteristics of PEinterfaced DGs have been taken into consideration in the load flow. The optimization problem is formulated and solved usingheuristic techniques viz MWOA and NSGA-II. The weakly meshed standard test beds of IEEE 33 and 69 bus distributionsystems have been used in the present work as autonomous microgrids.