Method for determining control range of operation voltage of 500kV bus of extra-high voltage alternating-current transformer substation

Abstract

The invention provides a method for determining the control range of operation voltage of a 500kV bus of an extra-high voltage alternating-current transformer substation. The method comprises the following steps: determining an upper limit and a lower limit of the operation voltage of the 500kV bus which is determined by the operation voltage of a 500kV device; determining an upper limit and a lower limit of the operation voltage of the 500kV bus which is determined by voltage withstand level of an extra-high voltage device; determining an upper limit of fluctuation of the operation voltage of the 500kV bus which is caused by an opening / closing loop of an extra-high voltage line; determining an upper limit and a lower limit of fluctuation of the operation voltage of the 500kV bus which is caused by power fluctuation of the extra-high voltage line; determining an upper limit and a lower limit of fluctuation of the operation voltage of the 500kV bus which is restricted by a special device; determining the control range of the operation voltage of the 500kV bus of an extra-high voltage alternating-current transformer substation. The method for determining the control range of the operation voltage of the 500kV bus of the extra-high voltage alternating-current transformer substation is capable of providing a strong support for arranging an operation manner of an interconnected electric power system and determining voltage controlling measures and has the advantages of strong adaptability and comprehensive consideration factors.

Description

technical field [0001] The invention relates to a determining method, in particular to a method for determining the operating voltage control range of a 500kV busbar of an UHV AC substation. Background technique [0002] The reactive power in the UHV power transmission and transformation system includes the charging power of the transmission line, the reactive power compensation of the high reactance and low capacitance (reactance) of the line, the reactive power loss of the line and transformer, and the reactive power exchange with the system, etc. The charging power of the UHV transmission line is very large, calculated according to the operation of the 1000kV line at the maximum allowable voltage of 1100kV, which is about 5.3 times that of the conventional 500kV transmission line. The charging power of the line will increase the voltage along the line, especially in the AC system connected to the UHV line, the operating voltage control has become an important issue that c...

AI Technical Summary

Problems solved by technology

Due to the long transmission distance between UHV power grid sites, large electrical distance, and weak reactive power support capability, except for power plant step-up transformers and UHV sites that are closer to grid-connected power plants, the operation control of 1000kV busbar voltage in other UHV load stations is subject to The operating voltage and control of the 500kV power grid in the nearby area have a greater impact

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