A Method and Structure for Optimal Allocation of AC Voltage Measuring Points for Reactive Power Control in Converter Stations

An AC voltage, optimized configuration technology, applied in the direction of AC network voltage adjustment, reactive power compensation, power transmission AC network, etc., can solve the complex structure of reactive power control voltage measurement point configuration, damage the stable operation of DC transmission system, and reactive power control System misoperation or refusal to operate and other problems, to achieve the effect of simplifying software and hardware configuration, optimizing secondary circuit wiring, and reducing investment costs

Inactive Publication Date: 2020-04-24
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to solve the problem that the reactive power control system may malfunction or refuse to operate during the transient process of existing single-phase voltage fluctuations or slight disturbances, thereby causing AC overvoltage, commutation failure, and damage to the entire system. For the stable operation of the DC transmission system and the configuration of reactive power control voltage measuring points with complex structure, high cost, poor reliability and safety, a method for optimal configuration of AC voltage measuring points for reactive power control in converter stations is provided

Method used

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  • A Method and Structure for Optimal Allocation of AC Voltage Measuring Points for Reactive Power Control in Converter Stations
  • A Method and Structure for Optimal Allocation of AC Voltage Measuring Points for Reactive Power Control in Converter Stations
  • A Method and Structure for Optimal Allocation of AC Voltage Measuring Points for Reactive Power Control in Converter Stations

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specific Embodiment 1

[0029] refer to Figure 1 to Figure 6 , the optimized configuration structure of the AC voltage measuring points for reactive power control of the converter station involved in this embodiment includes the AC busbar 1 of the converter station and the reactive power control unit 2 of the DC control and protection system, and the AC and DC connections of the converter station A three-phase voltage transformer 3 is arranged at the place, the voltage input end of the three-phase voltage transformer 3 is connected to the AC bus 1, the voltage output end is connected to the input end of the control cable 4, and the output end of the control cable 4 is connected to the DC control and protection system The voltage sampling input terminal of the reactive power control unit forms the three-phase AC voltage sampling signal loop of the reactive power control unit; the three-phase output voltage of the three-phase voltage transformer is used as the sampling voltage of the AC voltage criteri...

specific Embodiment 2

[0064] The feature of this embodiment is that the three-phase voltage transformers 3 are connected in parallel on the AC bus at the AC and DC connections of the converter station. All the other are with specific embodiment 1.

[0065] The invention calculates the reactive power consumption of the whole station according to the operation mode and working conditions of the DC system, controls the switching of all reactive devices through the DC control and protection system; ensures that the reactive power exchange between the DC and AC systems is within the allowable range or the AC The bus voltage is within the safe operating range to ensure the safety of the AC filter equipment and control the harmonic influence of the AC system. The reactive power control function in the DC control and protection system collects the operating parameters of the DC system; and then based on the total reactive power consumption The switching of the AC filter is carried out according to the situ...

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Abstract

The invention relates to an alternating-current voltage measuring point optimization configuration method for reactive power control of a converter station. The method comprises: a three-phase voltage transformer is arranged on an alternating-current bus at an alternating-current and direct-current connecting point of a converter station and a three-phase output voltage of a secondary side of the three-phase voltage transformer is used as an alternating-current voltage criterion of the reactive power control system, the voltage is led to reactive power control unit of a direct-current control protection system by a control cable to form a three-phase alternating-current voltage sampling signal of the reactive power control unit; the reactive power control unit carries out logical operation on the collected three-phase alternating-current voltage sampling signals to obtain a reactive power control logic criterion; and then the reactive power control unit outputs and executes the reactive power control logic to control switching of reactive equipment, thereby realizing reactive power compensation by the reactive power control system based on the three-phase voltage of the alternating-current system and guaranteeing stable operation of the whole direct-current power transmission system. According to the invention, problems of complicated configuration, high cost, and poor reliability and safety of the reactive control voltage measuring point in the existing converter station project can be solved.

Description

technical field [0001] The invention relates to an optimal configuration method and structure of AC voltage measuring points for reactive power control of a converter station. It is suitable for reactive power control of converter stations. It belongs to the technical field of high voltage direct current transmission system engineering. Background technique [0002] In the process of implementing the energy development strategy of "power transmission from west to east, mutual supply from north to south, and national networking", HVDC technology has demonstrated its superiority and has been widely adopted. In the HVDC transmission system, the DC converter consumes a large amount of reactive power, so that the connected AC system cannot supply reactive power by itself and maintain the voltage within the normal range. Most DC converters meet the reactive power demand by installing reactive power compensation equipment. At the same time, the reactive power compensation equipme...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02J3/16H02J3/36
CPCY02E40/30Y02E60/60
Inventor蒲洲贾红舟伦振坚施世鸿岳增坤
OwnerCHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD