access icon free Feasibility of fast restoration of power systems by micro-grids

This study shows that with fast and flexible power electronic converter interfaces, micro-grids can quickly re-energise blacked-out transmission lines without overvoltage. After the transmission lines are re-energised, micro-grids can speed up (i) the reconnections of generators and loads; (ii) the re-synchronisation of severed transmission line sections back to the original grid. Micro-grids have active power to energise auxiliary motors of large thermal plants in black start. Faster restoration is limited by steam-turbine plants because they cannot be speeded up beyond thermodynamic constraints.

Inspec keywords: steam power stations; distributed power generation; power system restoration; power convertors; power transmission reliability; power transmission lines; overvoltage; steam turbines

Other keywords: blacked-out transmission lines; thermal plants; power systems restoration; load reconnection; steam-turbine plants; active power; transmission line resynchronisation; thermodynamic constraints; overvoltage; generator reconnection; black start; auxiliary motors; microgrids; flexible power electronic converter interfaces

Subjects: Steam power stations and plants; Power system management, operation and economics; Power convertors and power supplies to apparatus; Reliability; Distributed power generation

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