Abstract
This article proposes new control architecture to improve the dynamic performance of DC microgrid by enhancing system inertia. The DC microgrids are gaining more importance due to the controlled and combined operation of multiple distributed energy resources (DERs). The DC microgrid is dominated by controlled power electronics converters. These converters are not having inbuilt inertia like rotating generators. Therefore, the DC microgrid has a fast rate of change of bus voltage under fluctuations of load, change in available power capacity of sources due to their randomness, etc. This affects the voltage profile and stability of the system under dynamic variation. The proposed closed loop control scheme estimates the amount of inertia required in the DC microgrid to minimize the voltage variation. The new power references are given to sources based on virtual generation to improve the inertia in the system. The proposed control scheme maintains the stability of DC microgrid. It also achieves effective power management based on available power in DERs with a minimum burden on the energy storage system (ESS). The bus voltages are regulated at reference value. The stability analysis of the system is carried out for DC microgrid under different operating conditions. The proposed control method is tested experimentally under diverse operating conditions.
Highlights
An effective way to reduce the energy crisis and carbon emission is possible by renewable energy sources (RESs) and distributed generations
CONTRIBUTION OF THIS ARTICLE This paper proposes a new control technique for estimation and addition of inertia in DC microgrid based on available power in the renewable sources
In this article, a new control technique is developed to improve the dynamic performance of DC microgrid under transient conditions
Summary
An effective way to reduce the energy crisis and carbon emission is possible by renewable energy sources (RESs) and distributed generations. Both the methods master-slave and droop control are affected by the intermittent nature of RESs. to maintain or improve the stability of microgrid under transient conditions, it is necessary to deal with system inertia. CONTRIBUTION OF THIS ARTICLE This paper proposes a new control technique for estimation and addition of inertia in DC microgrid based on available power in the renewable sources This added inertia is used to maintain the stability of DC microgrid under dynamic conditions. Iv) The proposed control scheme effectively utilized the virtual generation for maintaining the system stability It does not require any extra circuit or component such as additional source, ESS, etc in the DC microgrid.
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