A Substation VQC Control Method Considering the Safety of Substation Voltage

Abstract

The invention provides a control method for a substation VQC of considering the security of a variable medium-voltage side voltage, and aims at solving the problem that an existing control on the substation VQC according to a traditional 17-zone diagram cannot effectively ensure that a medium-voltage side busbar voltage of a three-winding transformer is located in a security range. The method comprises the following specific steps: firstly, collecting operating parameters of the three-winding transformer and a reactive power compensation configuration state of a low-voltage side; secondly, setting boundary conditions of a main transformer gate reactive power and a low-voltage side busbar voltage, and calculating a critical value of the security of the variable medium-voltage side voltage; and finally, setting locking conditions of a main transformer gear and reactive power compensation equipment and carrying out main transformer gear adjustment and reactive power compensation equipment switching according to predetermined strategies under different boundary conditions. According to the control method, the security of the medium-voltage side busbar voltage of the main transformer is considered when the condition that a high-voltage side reactive power and the low-voltage side busbar voltage of the three-winding transformer in the substation are located in a reasonable range is ensured; and the voltage adjusting pressure of a lower power grid at a load peak is relieved.

Description

technical field [0001] The invention relates to a VQC control method of a substation containing a three-winding transformer, in particular to a VQC control method of a substation considering the voltage safety of the middle side of the transformer. Background technique [0002] With the continuous expansion of the operation scale of the power grid, the complexity of the control of the operation state of the power grid is also increasing. In order to meet the higher requirements of users for power quality, it is necessary to achieve more effective coordination and cooperation between power grids of different voltage levels. [0003] The voltage and reactive power control (VQC) device of the substation mainly adjusts the gear of the transformer tap and the switching of the reactive power compensation equipment, so that the reactive power of the main transformer gate and the bus voltage are within the expected range, which is an important method to ensure the reliability of elec...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the current substation VQC control based on the traditional seventeen-zone map cannot effectively guarantee the safety of the busbar voltage on the medium-voltage side of the three-winding transformer, and propose a substation VQC control method that considers the safety of the voltage on the medium-voltage side of the transformer. The specific technology The scheme is as follows

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