Abstract
This work presents a fault ride-through control scheme for a non-isolated power topology used in a hybrid energy storage system designed for DC microgrids. The hybrid system is formed by a lithium-ion battery bank and a supercapacitor module, both coordinated to achieve a high-energy and high-power combined storage system. This hybrid system is connected to a DC bus that manages the power flow of the microgrid. The power topology under consideration is based on the buck-boost bidirectional converter, and it is controlled through a bespoke modulation scheme to obtain low losses at nominal operation. The operation of the proposed control scheme during a DC bus short-circuit failure is shown, as well as a modification to the standard control to achieve fault ride-through capability once the fault is over. The proposed control provides a protection to the energy storage systems and the converter itself during the DC bus short-circuit fault. The operation of the converter is developed theoretically, and it has been verified through both simulations and experimental validation on a built prototype.
Highlights
Power quality is a major concern in modern power systems, in weak microgrids.The concern for the economic importance of power quality issues has led to the development of standards and regulations that define the requirements for equipment and utilities in grid applications [1,2].Faults in power systems are one of the major causes of power quality issues
The solution to the DC bus fault behavior of the boost-based topology is the connection of a device able to interrupt, or at least limit, the fault currents flowing through the storage units
It can be seen that the inclusion of the short-circuit fault-tolerant features in the converter adds four more switches compared to the original topology (Figure 1), resulting in higher cost and size than in the initial case
Summary
Power quality is a major concern in modern power systems, in weak microgrids. With an adequate coordinated control, these hybrid systems ensure a stiff behavior of the DC bus, decoupling the grid and the microgrid sides They enhance the system reliability by preventing the low-dynamic storage systems to provide large current spikes, resulting in an increase of the system lifetime [9]. The simplest PEC topology for interfacing two energy storage devices that build up the HESS to a DC microgrid is the direct connection of two parallel bidirectional boost converters to the DC bus [7,11,12,13,14,15,16,17,18]
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