Flexible AC transmitting system based on flywheel energy storage

Abstract

A flexible AC power transmission system based on flywheel energy storage, including a double-fed flywheel energy storage motor, an AC excitation power supply, a monitoring device, a series transformer and an anti-parallel bidirectional thyristor. The AC excitation power supply includes a parallel-side converter, a series-side converter and capacitors. The AC end of the parallel-side converter is connected to the rotor winding of the doubly-fed flywheel energy storage motor. The two DC terminals of the parallel-side converter and the two DC terminals of the series-side converter The terminals are respectively connected to both ends of the capacitor, and the AC terminal of the series side converter is connected to the primary winding of the series transformer. The secondary winding of the series transformer is connected in parallel with the anti-parallel bidirectional thyristor, and one end of the secondary winding of the series transformer is connected with the stator winding of the flywheel energy storage motor. The monitoring device realizes bypass protection by controlling the connection state of the anti-parallel bidirectional thyristor. The invention has the functions of energy storage, power generation, synchronous phase modulation, stable node voltage, changing line impedance to suppress oscillation, regulating line flow, etc., ensuring safe, economical and efficient operation of the power system.

Description

technical field [0001] The invention belongs to flywheel energy storage technology and flexible AC power transmission technology, and specifically relates to a flexible AC power transmission system based on flywheel energy storage, including a double-fed flywheel energy storage motor, an AC excitation power supply and a monitoring device. Background technique [0002] In the current power system, since there are no devices with large capacity and fast access to electric energy, the production and consumption of electric energy must be basically kept in a state of electromechanical power balance at all times. Once the system is disturbed and causes dynamic power imbalance, it may pose a threat to the stability of the system, and serious electromechanical power imbalance will lead to system collapse. [0003] In order to solve this problem, the current common method is to use relay protection and safety and stability control devices to perform operations such as machine cut-of...

AI Technical Summary

Problems solved by technology

The energy storage phase-modulating motor solves the problem of power balance, but it does not involve regulating the power flow of the transmission line to achieve the optimal distribution of the system power flow, suppressing the power oscillation caused by the line-to-ground short circuit, supporting the system node voltage, and ensuring that the transmission capacity of the transmission line is close to issues such as thermal stability limits

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