Automatic control system and method for 35kV capacitor reactance provincial and local collaboration of 500kV transformer substation

Abstract

The invention provides an automatic control system for 35kV capacitor reactance provincial and local collaboration of a 500kV transformer substation. The automatic control system comprises a provincial dispatching AVC, a local dispatching AVC, the 500kV transformer substation and a power plant AVC substation. The provincial dispatching AVC comprises a voltage planning curve issuing module and an optimal load flow calculation module. A local dispatching AVC substation comprises a voltage planning curve receiving module and a strategy calculation module. The provincial dispatching AVC issues a voltage planning curve to the voltage planning curve receiving module of the local dispatching AVC through the voltage planning curve issuing module, receives blocking signals sent by the power plant AVC substation and reactive spare capacity information sent by the local dispatching AVC in real time, issues a high-voltage bus control target to the power plant AVC substation through the optimal load flow calculation module, and issues a reactive power regulation instruction of the main change low-voltage side of the 500kV transformer substation to the local dispatching AVC. The local dispatching AVC calculates and issues a remote control signal through the strategy calculation module according to the instruction issued by the provincial dispatching AVC to remotely control capacitor reactance separation and union of the 500kV transformer substation. The invention further relates to an automatic control method for the 35kV capacitor reactance provincial and local collaboration of the 500kV transformer substation.

Description

technical field [0001] The invention relates to a 500kV substation 35kV capacitive reactance and land-saving cooperative automatic control system. The invention also relates to a method for using the system to carry out coordinated automatic control of 35kV capacitive reactance in a 500kV substation in a land-saving manner. Background technique [0002] The voltage and reactive power operating state of the 500kV substation directly determines the voltage level and reactive power balance state of the power grid. As the gateway of the main network partition, the voltage and reactive power of the 220kV busbar of the 500kV substation are affected and limited by the low-voltage reactive power compensation switching in the substation. The arrangement of reasonable control strategies and the setting of suitable control targets will directly determine the operation quality of 220kV bus. [0003] At present, there are two main control modes for voltage and reactive power regulation ...

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Problems solved by technology

[0004] 1) Manual adjustment: Substation monitoring personnel perform capacitive reactance switching at typical load change time points according to experience. The disadvantage of this method is that the voltage may exceed the limit in a short time due to untimely adjustment.

In terms of access debugging, because there is no collection of detailed protection action signals due to provincial adjustments, the relevant protection signals are generally combined at the station to form an AVC blocking signal, which requires related transformation work at the station (if some protection actions need to be instantaneously The node is transformed into a self-sustaining node), which increases the investment cost

At the same time, the workload of acceptance and operation and maintenance is heavy, and complex signal combination logic needs to be maintained, and the risk of error is high; when equipment is put into operation or withdrawn from operation, it is necessary to re-test and accept the combined signal at the substation.

[0009] 2) In terms of operation management, due to the large daily workload of provincial dispatchers and the large number of 500kV substations in the provincial network, the current voltage and reactive power adjustment work of 500kV substations is entrusted to substation operators to complete

If the AVC is directly controlled by the provincial dispatcher, the dispatcher needs to put in a lot of energy to monitor and release the AVC blocking signal, which will affect the dispatcher's monitoring of the power grid operation

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