Control and protection method of controllable phase shifter in extra-high voltage power grid

Abstract

The invention provides a control and protection method for a thyristor controlled phase shifter of a supergrid and relates to operational control and protection circuit devices of alternating current main lines or alternating current power distribution networks and control methods of the protecting circuit devices, in particular to the control and protection method for the thyristor controlled phase shifter used for optimization, regulation and control of the supergrid. The method includes the following steps that the operation status of a circuit breaker and an isolating switch of the thyristor controlled phase shifter is monitored in real time; according to preset sequential control / remote control operation, the switching operation status of the thyristor controlled phase shifter is controlled, and in the control process, locking protection is conducted on the operation process according to interlocking logic; phase locking is conducted on the primary side voltage of a parallel transformer through a digital phase-locked loop; the secondary side voltage jump and a group valve current value are detected, so that group valve zero passage and natural shut-off are judged and it is guaranteed that the winding and short circuit phenomenon in the gear shifting process is avoided; an analog quantity sampling control unit monitors the line power and the target power in real time, so that steady-state active automatic control is achieved; fault types are judged through a monitoring protection subsystem, so that auxiliary protection and body protection are provided for the thyristor controlled phase shifter.

Description

technical field [0001] The invention relates to an operation control and protection circuit device of an AC main line or an AC power distribution network and a control method thereof, in particular to a control and protection method of a controllable phase shifter used for optimal regulation of an ultra-high voltage transmission network. Background technique [0002] With the continuous development of the social economy, the growing demand for power supply in life and production has strongly stimulated the rapid development of the power system. The spatial distance between the energy center and the load center is the objective motivation for large-capacity and long-distance transmission of electric energy. In order to meet the needs of power transmission, the size of the power network is increasing day by day. Since the power system is constrained by the thermal stability limit of the equipment, the voltage drop constraint of the transmission line, the N-1 static security c...

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Problems solved by technology

This uncontrolled free flow often has to reduce the utilization rate of system equipment or make the system operate in a state where the technical and economic indicators are not very good due to certain constraints on system operation.

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