Reactive power voltage analysis method and system

Abstract

The invention discloses a reactive power voltage analysis method. The method comprises the following steps that: step S1, the charging power value and reactance value of a line in an alternating-current interconnected power grid in an ultra-high voltage 1000 / 500 kV system, as well as high-and low-voltage parallel reactive power compensation data of transformer substations are obtained; step S2, the high-and low-voltage parallel reactive power compensation data and outgoing charging power data of a location area 500 kV transformer substation in the ultra-high voltage 1000 / 500 kV system are obtained; step 3, the voltage adjustment performance of voltage adjustment resources in the system is evaluated, so that a voltage adjustable range can be obtained; and step 4, whether the voltage adjustable range can be matched with voltage control is judged, if the voltage adjustable range can be matched with the voltage control, the system can operate normally, reactive power voltage analysis is terminated, if the voltage adjustable range is not matched with the voltage control, the voltage adjustment resources in the system are maintained, the method returns to the step 3, and the sequence of the step 1 and step 2 can be reversed. The invention also provides a reactive power voltage analysis system. With the reactive power voltage analysis method and system of the invention adopted, reactive power voltage problems can be detected quickly and accurately, and the operational risks of the ultra-high voltage 1000 / 500 kV system can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of electric power system voltage automatic control, in particular to a reactive voltage analysis method and system. Background technique [0002] The power frequency overvoltage withstand capacity of 1000kV AC busbar is 1130kV, and the duration is 30 minutes. When the UHV system is running, the voltage of the substation bus may increase due to the loss of the low-voltage reactor after the main transformer is cut off or the high reactance is lost after the line is cut off. With the intensive feed-in of high-power DC in the 500kV power grid, during low-peak periods, especially during holidays, a large number of units need to be mediated in order to cope with peak regulation, which weakens the reactive power adjustment capability of the system and may cause the bus voltage to rise beyond the allowable value after the accident. Therefore, it is necessary to control the bus voltage. Contents of the invention ...

AI Technical Summary

Problems solved by technology

When the UHV system is running, the voltage of the busbar in the substation may increase due to the loss of the low-voltage reactor after the main transformer is cut off or the high reactance is lost due to the cut-off of the line.

With the intensive feed-in of high-power DC in the 500kV power grid, during low-peak periods, especially during holidays, a large number of units need to be mediated in order to cope with peak regulation, which weakens the reactive power adjustment capability of the system and may cause the bus voltage to rise beyond the allowable value after the accident. Therefore, it is necessary to control the bus voltage

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