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A method for selecting voltage effectiveness of UHVDC reactive power control function

A UHV DC and power control technology, applied in AC network voltage adjustment, reactive power compensation, electrical components, etc., can solve problems such as low voltage reliability

Active Publication Date: 2016-10-12
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for selecting the voltage validity of UHV DC reactive power control function to solve the problem of low reliability of the current voltage validity selection process

Method used

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  • A method for selecting voltage effectiveness of UHVDC reactive power control function
  • A method for selecting voltage effectiveness of UHVDC reactive power control function
  • A method for selecting voltage effectiveness of UHVDC reactive power control function

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] In this implementation, there are four large filter groups ACF1∽ACF4 actually put into use in the UHV converter station, and the three-phase bus voltage of each filter large group ACF1∽ACF4 is connected to the corresponding PT control box through hard wiring. DC station control system. According to the actual number of large groups of AC filters in the converter station, the present invention simultaneously samples and calculates the voltages of the busbar PTs of each large group, and checks the validity of the voltage of each large group in the DC station control software (TDM measurement is normal and the large group is in Putting into operation state) and comparing the difference range between each other, if the measured value of each large group bus voltage is judged to be valid, then select the filter large group voltage as the U...

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Abstract

The invention relates to a method for selecting the validity of a UHV DC reactive power control function voltage, and belongs to the technical field of UHV DC power transmission. The present invention firstly collects the voltages of all large groups of bus PTs and inputs them to the DC station controller, judges whether the voltages of each large group are within the predetermined range, and considers it valid, and then compares the difference between them, and the difference is also within a certain range , then select a group of voltages according to a certain priority order as the judgment reference value. At the same time, the reactive power control strategy under abnormal AC voltage drop is considered to avoid the problem of excessively high AC grid voltage caused by abnormal switching of filters caused by incorrect bus voltage selection.

Description

technical field [0001] The invention relates to a method for selecting the validity of a UHV DC reactive power control function voltage, and belongs to the technical field of UHV DC power transmission. Background technique [0002] Reactive power control maintains the reactive power exchanged between the converter station and the AC system within the allowable range by controlling the switching on and off of the converter station filter group, while controlling the harmonic content within a reasonable range. In addition, it is equipped with an overvoltage limiting control function, and through the automatic switching of the filter, the bus voltage of the AC field is guaranteed to be within a certain range. In general, the converter station is equipped with multiple sets of filters, and the voltage reference value used for overvoltage limiting control and reactive power control U mode needs to be selected. Currently, the bus PT voltage of bus I and II of the 500kV AC field is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00H02J3/16H02J3/36
CPCY02E40/30Y02E60/60
Inventor 涂仁川王胜王柏恒杨健张又珺戴国安吴东崛
Owner XUJI GRP