Extra-high-voltage DC power transmission control device for suppressing AC transient overvoltage

A UHV DC and control device technology, applied in AC network voltage adjustment, power transmission AC network, reactive power compensation, etc., to achieve the effect of suppressing AC grid overvoltage and increasing reactive power

Active Publication Date: 2017-08-04
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to increase the reactive power consumed by the converter in a short period of time on the basis of keeping the power of the sound DC transmission project in the near area constant during the serious increase in the voltage of the AC grid, and to suppress the overshoot of the weak AC grid at the sending end. The purpose of voltage generation is to provide an UHVDC power transmission control device that suppresses temporary AC overvoltages to solve the above problems

Method used

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  • Extra-high-voltage DC power transmission control device for suppressing AC transient overvoltage
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  • Extra-high-voltage DC power transmission control device for suppressing AC transient overvoltage

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Embodiment

[0031] Such as figure 1 As shown, the present invention is an UHV DC transmission control device for suppressing AC temporary overvoltage, including a voltage and current measurement terminal, a grid SCADA system, a control rate generation unit, a control output calculation unit, a control start / exit unit, and a UHV DC The control system on the transmission inverter side is connected to the UHVDC rectification side control system; the voltage and current measurement terminal is connected to the control start / exit unit and the control output calculation unit; the grid SCADA system is connected to the control rate generation unit; the control rate The generation unit is connected to the control output calculation unit; the control start / exit unit is connected to the control output calculation unit; the control output calculation unit is respectively connected to the UHVDC inverter side control system and the UHVDC rectification side control system.

[0032] The voltage and curre...

Embodiment 2

[0044] Such as figure 2 As shown, this embodiment is described in detail on the basis of Embodiment 1. Taking dual UHV DC feed-in power grids as an example, PSCAD is used to construct a simulation model of a ±800kV UHV DC transmission system and its near-area power grid, as shown in figure 2 shown. figure 2 Among them, the distance between the 1# DC converter station and the 2# DC converter station is only 20km, which belongs to a typical multi-DC external transmission system with centralized locations. The two DC related parameters are shown in Table 1.

[0045] Table 1 DC operating parameters during normal operation

[0046]

[0047] In order to highlight the characteristics, consider a more serious working condition. Under this working condition, the three-phase short-circuit current levels of 1# and 2# DC converter stations are about 30kA and 30kA respectively, and the corresponding short-circuit ratio of DC transmission is only 2.2, which belongs to medium Streng...

Embodiment 3

[0056] Such as image 3 As shown, in this embodiment, under the working conditions described in Embodiment 2, due to the obstruction of DC transmission unipolar power transmission, the AC bus voltage rises, the maximum effective value of overvoltage reaches 1.26pu, and the continuous overvoltage reaches 1.247pu, exceeding the overvoltage protection fixed value.

[0057] First, the control start / exit unit obtains the effective value of the AC system voltage from the voltage measurement link, and starts the control system when the overvoltage of the AC bus is found to be high.

[0058] Secondly, the device obtains from the SCADA system, the operation mode of the nearby power grid and DC, and generates the control rate through the control rate generation unit.

[0059] Among them, P0 is the transmission power of the DC system before 2# DC blocking, and UN is the rated voltage of the system.

[0060] Third, the control rate generation unit sends the generated control rate to the...

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Abstract

The invention discloses an extra-high-voltage DC power transmission control device for suppressing the AC transient overvoltage. The extra-high-voltage DC power transmission control device comprises a voltage and current measurement end, a power grid SCADA system, a control rate generation unit, a control output quantity calculation unit, a control starting/exiting unit, an extra-high-voltage DC transmission inverter-side control system and an extra-high-voltage DC power transmission rectifier-side control system, wherein the above parts are correspondingly connected. The voltage and current measurement end is connected with the control starting/exiting unit and the control output quantity calculation unit. The power grid SCADA system is connected with the control rate generation unit. The control rate generation unit is connected with the control output quantity calculation unit. The control starting/exiting unit is connected with the control output quantity calculation unit. The control output quantity calculation unit is respectively connected with the extra-high-voltage DC transmission inverter-side control system and the extra-high-voltage DC power transmission rectifier-side control system.

Description

technical field [0001] The invention relates to the field of high-voltage direct-current transmission, and is specifically designed for an ultra-high-voltage direct-current control device for suppressing alternating-current temporary overvoltage. Background technique [0002] Due to its advantages in long-distance large-capacity power transmission and asynchronous grid interconnection, HVDC technology has been rapidly developed and widely used in China, India, South Korea, Brazil and other countries. Current source DC transmission projects use thyristors as the main commutation components, which consume 50% to 60% of the reactive power of the transmission power during normal operation. Taking the UHV DC project of ±800kV / 8000MW as an example, the reactive power consumed by the thyristor converter can be as high as 6400Mvar during full power operation. In order to eliminate the impact of a large amount of reactive power consumption on the AC system, a large number of reactiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36Y02E60/60Y02E40/30
Inventor 滕予非张鹏姜振超李小鹏刘明忠
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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