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Abstract
Energy storage systems with multilevel converters play an important role in modern electric power systems with large-scale renewable energy integration. This paper proposes a reverse-blocking modular multilevel converter for a battery energy storage system (RB-MMC-BESS). Besides integrating distributed low-voltage batteries to medium or high voltage grids, with the inherited advantages of traditional MMCs, the RB-MMC-BESS also provides improved DC fault handling capability. This paper analyzes such a new converter configuration and its operating principles. Control algorithms are developed for AC side power control and the balancing of battery state of charge. The blocking mechanism to manage a DC pole-to-pole fault analyzed in depth. Comprehensive simulation results validate both the feasibility of the RB-MMC-BESS topology and the effectiveness of the control and fault handling strategies.
Highlights
In recent years, ever-increasing energy demands and shortage of traditional fossil fuels seriously challenged the sustainable development of human society
This paper proposes a reverse blocking modular multilevel converter (MMC)-battery energy storage system (BESS) (RB-MMC-BESS) for enhancing the DC fault handling capability, which consists of new sub-modules (SMs) and distributed battery banks
A typical (n?1) level three-phase MMC-based BESS is shown in Fig. 1, comprised of three phase legs where each leg contains a stack of 2n identical sub-modules (SMs) and two inductors (La)
Summary
Ever-increasing energy demands and shortage of traditional fossil fuels seriously challenged the sustainable development of human society. At the same time, increasing concern about environment problems and carbon emissions of fossil fuels has provoked worldwide active research on the next-generation electric power system, which is known as the smart grid [1,2,3] and/or energy internet (EI) [4, 5] It features renewable energy resources and intelligent energy management. MMCs used in BESSs for interfacing low- or medium-voltage batteries to mediumor high-voltage grids were reported in [24,25,26,27] They enable a flexible scaling of power modules to integrate energy storage and power electronics to a wide range of operating voltages, output power and stored energy.
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