Unlock instant, AI-driven research and patent intelligence for your innovation.

Output reactive compensation analysis method for long-distance 200kV submarine cable of offshore wind plant

A wind farm, long-distance technology, applied in reactive power compensation, AC network voltage adjustment, etc., to achieve the effect of reducing the degree of influence

Active Publication Date: 2014-08-13
JIANGSU KENENG ELECTRIC POWER ENG CONSULTING
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Large-scale offshore wind farms are new in China, and there is currently no relevant standard and unified calculation method to calculate reactive power compensation for long-distance submarine cables

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Output reactive compensation analysis method for long-distance 200kV submarine cable of offshore wind plant
  • Output reactive compensation analysis method for long-distance 200kV submarine cable of offshore wind plant
  • Output reactive compensation analysis method for long-distance 200kV submarine cable of offshore wind plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The wind turbine itself does not have the ability to dynamically adjust the power factor

[0036] A. Setting of fan outlet power factor

[0037] According to the section and length of the 35kV submarine cable, it can be calculated that the capacitive charging power of the 35kV submarine cable is 8.29Mvar. If the fan power factor is set to 0.98, the internal inductive reactive power loss of the wind farm is 24.92Mvar at 100% output, 9.241Mvar at 60% output, and 6.507Mvar at 50% output.

[0038] Therefore, the power factor can be set to 0.98 in the normal operation mode of the wind farm. When the wind farm produces 60% of the output, the reactive power loss inside the wind farm and the capacitive charging power are basically balanced.

[0039] B. Capacity of 220kV high voltage shunt reactor

[0040] According to the section and length of 220kV submarine cable, land cable and overhead line, it can be calculated that the reactive power compensation capacity required for f...

Embodiment 2

[0072] The wind turbine has the ability to dynamically adjust the power factor, and the rated power factor can be dynamically adjusted within +0.95~-0.95

[0073] The calculation method of power frequency voltage and power frequency overvoltage is the same as the calculation method in embodiment 1, and the calculation result is: a high voltage shunt reactor of 70 Mavr needs to be installed.

[0074] When: the rated power factor of the wind turbine is 0.98, and the wind farm is fully powered, after calculation, after the wind farm is installed with a 70Mvar high voltage shunt reactor, the power factor of the grid side of the wind farm sending line is 1.

[0075] Therefore, the capacity of the high voltage shunt reactor installed in the wind farm can be determined as 70Mvar.

[0076] When the wind turbine power factor has a dynamic adjustment of +0.95~-0.95, its dynamic reactive power compensation capacity calculation is shown in Table 7.

[0077] Table 7 Calculation of dynamic...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention solves the problem of voltage fluctuation caused by the randomness of the wind plant output in a common coupling point and outputs or absorbs a certain capacity of reactive output according to the needs of a power grid in the peak and low ebb load time periods of the power grid, so as to play the effect of regulating the voltage of the power grid. The output reactive compensation analysis method comprises the steps that A, the reactive output of a wind power generating set in the wind plant is given to full play, the reactive loss of a main transformer of a booster station, an internal integrated circuit and a generator terminal booster transformer in the wind plant is balanced, and power operation software is utilized to obtain a proper power factor setting value of a fan; B, the charging power of an output line is calculated according to the length and the section of a 220kV output line, and high voltage parallel reactor compensation capacity required by various compensation degrees is also calculated; and C, in order to meet the requirement of the wind plant on having the voltage control and reactive power regulation capabilities in the national standards, the capacity of a dynamic reactive compensation device to be mounted in the wind plant is worked out according to the fan power factor determined in the step A and the high voltage parallel reactor compensation capacity determined in the step B.

Description

technical field [0001] The invention relates to an analysis method for reactive power compensation sent by a long-distance 220kV submarine cable in an offshore wind farm, especially a method suitable for large-scale offshore wind farms with a 220kV submarine cable length exceeding 20km, and high-voltage shunt reactors, in-field The calculation of the capacity of the dynamic reactive power compensation device is a calculation method of the reactive power compensation capacity. Background technique [0002] With the increasing shortage of land resources in coastal provinces, the construction of large-scale offshore wind farms has become the direction of future wind power development. Offshore wind power has the following characteristics: [0003] (1) The planning area of ​​the wind farm is large, and the length of the 35kV collector submarine cable is long. [0004] (2) The method of offshore booster station + onshore centralized control center is adopted, and the main trans...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/30
Inventor 胡煜肖凌
Owner JIANGSU KENENG ELECTRIC POWER ENG CONSULTING