Abstract
This paper proposes a super capacitor energy storage-based modular multilevel converter (SCES-MMC) for mine hoist application. Different from the conventional MMCs, the sub-modules employ distributed super capacitor banks, which are designed to absorb the regenerative energy of mine hoist and released in the traction condition, so as to improve energy utilization efficiency. The key control technologies are introduced in detail, followed by analysis of the configuration and operation principles. The feasibility of the proposed SCES-MMC topology and the control theory are also verified. Simulation results show that SCES-MMC can adapt to the variable frequency speed regulation of the motor drive, which shows good application prospects in the future for medium- and high-voltage mine hoist systems.
Highlights
The mine hoist conveyor is typically one of the largest consumers of electric power, besides of the excavator systems, of all equipment in the mining industry
Since the regenerative energy in an electric mine hoister and excavator may be as high as 60 percent of the motoring power [8,9], active front-end rectifiers (AFE) are usually adopted to feed the regenerative energy back into the power distribution grid in order for it not to be wasted
Published technical papers focus mainly on battery issues, since the super capacitors show better power density and a longer service life compared to energy storage system (BESS)-based modular multilevel converter (MMC) [20,21]
Summary
The mine hoist conveyor is typically one of the largest consumers of electric power, besides of the excavator systems, of all equipment in the mining industry. MMCconditions, seems anthe ideal solution the abovementioned could to operate for a short time under outage reliability of for the mine hoist equipment would be significantly improved. Published technical papers focus mainly on battery issues, since the super capacitors show better power density and a longer service life compared to energy storage system (BESS)-based MMCs [20,21]. Energy-harvesting super the SCES-MMC operates astoaavoid powermine source to ensureIn the mine hoist keeps for aisshort time the when power improved accidents. The safety of the mine hoist equipment can be significantly is quickly transferred to the SCES to avoid DC bus overvoltage. 3, the system control strategies including motor and effectiveness thestate proposed topology and theory, extensive simulation results are demonstrated frequency controlsof and of charge (SOC) balancing controls are explored in detail.
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