Method and device for online updating reactive voltage control sensitivity of new energy station

A technology of voltage control and update method, which is applied in the direction of circuit devices, reactive power compensation, AC network voltage adjustment, etc., and can solve problems such as low control accuracy and inability to adapt to changes in power grid operation mode

Active Publication Date: 2021-09-14
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problems in the prior art that new energy stations adopt fixed reactive voltage control sensitivity, resulting in low control accuracy and inability to adapt to changes in power grid operation mode, and provides a The online update method of reactive voltage control sensitivity of new energy stations can calculate more accurate reactive voltage control sensitivity based on the current grid operation mode, and the calculation accuracy will not be affected by changes in active power

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  • Method and device for online updating reactive voltage control sensitivity of new energy station
  • Method and device for online updating reactive voltage control sensitivity of new energy station
  • Method and device for online updating reactive voltage control sensitivity of new energy station

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Embodiment 1

[0033] A new energy station reactive voltage control sensitivity online update method of the present invention, see figure 1 shown, including:

[0034] In the first step, when the grid-connected reactive power changes greater than the set value, the online update calculation of the sensitivity is triggered;

[0035] The second step is to read two sets of system state quantities before and after the reactive power change. The read system state quantities include: grid-connected active power P before the reactive power change 1 , Grid-connected reactive power Q before reactive power changes 1 , Grid-connected point voltage V before reactive power change 1 , Grid-connected active power P after reactive power changes 2 , Grid-connected reactive power Q after reactive power changes 2 , Grid-connected point voltage V after reactive power changes 2 ;

[0036] The third step is to calculate the voltage change of the grid-connected point before and after the reactive power change...

Embodiment 2

[0048] Based on the same inventive concept as the method in Embodiment 1, an online updating device for reactive voltage control sensitivity of a new energy station according to the present invention includes:

[0049] The data acquisition module is used to read the grid-connected active power, grid-connected reactive power and grid-connected point voltage before and after the reactive power change;

[0050] The voltage variation calculation module is used to calculate the voltage variation of the grid connection point before and after the reactive power change based on the grid connection point voltage before and after the reactive power change;

[0051] The voltage variation correction module is used to correct the voltage variation of the grid-connected point based on the grid-connected active power, grid-connected reactive power and current reactive voltage control sensitivity before and after the reactive power change;

[0052] The sensitivity updating module is configure...

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Abstract

The invention discloses a method for online updating the reactive voltage control sensitivity of a new energy station. The method comprises the following steps: triggering calculation when grid-connected reactive power change is greater than a preset value; reading grid-connected active power, grid-connected reactive power and grid-connected point voltage before and after reactive power change; calculating grid-connected point voltage variation before and after reactive power change; correcting the grid-connected point voltage variation according to the grid-connected active power variation; and calculating reactive voltage control sensitivity according to the corrected grid-connected point voltage variable quantity and the grid-connected reactive power variable quantity. According to the method, online updating of the reactive voltage control sensitivity of the new energy station can be realized, and the calculation accuracy is not influenced by the change of the active power.

Description

technical field [0001] The invention belongs to the technical field of new energy station voltage control, and specifically relates to an online update method for new energy station reactive voltage control sensitivity, and also relates to an online update device for new energy station reactive voltage control sensitivity. Background technique [0002] The reactive power and voltage control system of the new energy station needs to adjust the voltage of its high-voltage busbar to the set value issued by the grid dispatcher, but the output reactive power of the new energy station does not have a definite relationship with the voltage of its high-voltage busbar, and is related to related to the way the grid operates. Therefore, how to adjust the output reactive power of the new energy station so that the voltage of the high-voltage bus is consistent with the set value is a difficult point in the reactive power voltage control of the new energy station. [0003] At present, ne...

Claims

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Application Information

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IPC IPC(8): H02J3/16
CPCH02J3/16H02J2203/20Y02E40/30
Inventor欧阳逸风明镜何华伟温富光邹宇
OwnerNANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD