Unit synchronizing system for large power plant

Abstract

The invention provides a unit synchronizing system for a large power plant. The system comprises a generator arranged in a steam turbine plant, a main transformer, a GCB connected between the generator and the main transformer, and at least one circuit breaker which is arranged in a switching station and connected with the main transformer, wherein the steam turbine plant is provided with a synchronizing device connected with the GCB, the switching station is provided with a multi-point synchronizing device connected with the circuit breaker, the multi-point type synchronizing device is used for synchronizing operation of at least one circuit breaker of the switching station, the synchronizing device is used for synchronizing operation of the GCB and performing frequency modulation and voltage regulation of the generator, and the synchronizing device and the multi-point synchronizing device are connected through an optical fiber for information exchange and sharing. The system is advantaged in that synchronizing operation of the circuit breaker in the switching station is achieved by additionally arranging the multi-point type synchronous device, and the defect that misoperation oroperation refusal is caused when a distance between synchronizing points of the large power plant is long is overcome; through optical fiber communication, information exchange and sharing between the multi-point type synchronizing device and the synchronizing device are realized, locking among a plurality of synchronizing points is realized, and wiring operation of external cables is simplified.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and more specifically, the invention relates to a unit synchronization system used in large-scale power plants. Background technique [0002] With the continuous expansion of the scale of the power plant and the increase in the number of units, the distance between the switching station in the power plant and the units in the steam turbine building is gradually increasing, and it has reached or exceeded 1.5km at present. The 500kV switch station of a large power plant usually adopts the 3 / 2 circuit breaker wiring form. There are generally three synchronous points in this type of power plant: the generator outlet circuit breaker (GCB), and the side circuit breaker near the main transformer (main transformer) side of the switch station. and breaker. [0003] In the prior art, the synchronization of the three synchronizing points of the GCB, the side circuit breaker and the circuit b...

AI Technical Summary

Problems solved by technology

This technology only uses a set of synchronizing device, and collects the voltage of the two synchronizing points of the side circuit breaker and circuit breaker near the main transformer side of the switch station to the synchronizing device of the steam turbine plant through cables. When it is far away, the required cable distance may exceed 1.5km, and the transmission of control signals through the cable is no longer reliable; due to the influence of factors such as distributed capacitance in the cable, the voltage of the voltage acquisition and closing circuit does not meet the specification requirements, which is likely to cause synchronization points. Misoperation or refusal to move

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