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Power generating station reactive power distribution method based on voltage sensitivity

A technology of power distribution and voltage sensitivity, which is applied in the field of reactive power distribution of power stations based on voltage sensitivity, can solve the problem of unstable reactive power, increased voltage imbalance at grid-connected points, and inability to guarantee reactive power compensation, etc. problems, achieve the effect of scientific and reasonable distribution method, reduce unbalance degree, and ensure safe operation

Active Publication Date: 2016-08-24
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned method of jointly compensating reactive power through each power generation unit and reactive power compensation device, whether it is each power generation unit or the reactive power compensation device, only compensates according to its own real-time unstable reactive power output. However, due to Most voltage drop values ​​are unstable and irregular. Correspondingly, the amount of reactive power to be compensated each time is unstable and irregular. It is only compensated according to its own real-time unstable reactive power output, which cannot guarantee that the reduced reactive power will be compensated to a normal value; moreover, a voltage drop fault will cause some or even all power generation units to go off-grid, making the grid-connected point voltage unbalanced Intensity increases, which seriously affects the operation of photovoltaic power stations; some or even all power generation units are off-grid, which also makes it more difficult to guarantee the effectiveness of reactive power compensation

Method used

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  • Power generating station reactive power distribution method based on voltage sensitivity
  • Power generating station reactive power distribution method based on voltage sensitivity

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiments of the present invention provide a reactive power allocation method for power stations based on voltage sensitivity, such as figure 1 shown, including:

[0029] 101. Measure the real-time output voltage Ua of the grid-connected point; the grid-connected point is an output merging node of multiple collector lines in the power station.

[0030] Wherein, the power station in this embodiment is a photovoltaic power station, and the photovoltaic power station relies on solar cell components and utilizes the electronic properties of semiconductor materials to convert light energy into electrical energy.

[0031] Photovoltaic power stations can be divided into off-grid photovoltaic power stations and grid-connected photovoltaic power stations. The investment of grid-connected photovoltaic power stations is 25% lower than that of off-grid photovoltaic power stations. They support each other with large power grids and increase the scale of photovoltaic power generati...

Embodiment 2

[0047] Embodiments of the present invention provide a reactive power allocation method for power stations based on voltage sensitivity, such as figure 2 shown, including:

[0048] 201. Measure the real-time output voltage Ua of a grid-connected point; the grid-connected point is an output merging node of multiple collector lines in a power station.

[0049] 202. Determine whether a voltage drop occurs in the power station according to the real-time output voltage Ua and the reference voltage Ub.

[0050] 2021. If Ua is not less than Ub, the output of the power station is normal and no voltage drop occurs.

[0051] 2022. If Ua is smaller than Ub, a voltage drop occurs in the power station, and reactive power needs to be compensated.

[0052] 203. When a voltage drop occurs in the power station, calculate a real-time voltage drop value Uc, where Uc=Ub−Ua.

[0053] 204. Using a proportional-integral-differential regulator to set the total amount of reactive power Q that needs...

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Abstract

The invention discloses a power generating station reactive power distribution method based on voltage sensitivity, and relates to the power generating station reactive power distribution compensation technology field. The distribution method is scientific and reasonable, the reduced reactive power is compensated to the normal value, and the validity is high. The unbalance degree of the grid-connected point voltage is greatly reduced, and the safe operation of the power generating station is guaranteed. The technical scheme is characterized in that grid-connected point real-time output voltage is measured; whether voltage drop occurs is determined; when the voltage drop occurs, the real-time voltage drop value is calculated; the total reactive power amount required to be compensated is rectified; the sensitivity of the reactive power sent by the power generating units and the reactive power compensation device to the grid-connected point voltage is calculated; the weight is distributed according to the proportion of the total sensitivity occupied by the sensitivity of the reactive power sent by the power generating units and the reactive power compensation device to the grid-connected point voltage, and the total reactive power amount is distributed. The power generating station reactive power distribution method is mainly used for the reactive power compensation.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation of power stations, in particular to a reactive power distribution method of a power station based on voltage sensitivity. Background technique [0002] In recent years, my country's photovoltaic power generation industry has developed rapidly. As of September 2015, the installed capacity of photovoltaic power generation in China reached 37.95 million kilowatts. It is about 100 million kilowatts, so it is the top priority for technicians in this field to devote themselves to the research of photovoltaic power generation technology and promote the development of photovoltaic industry. [0003] When encountering severe weather (such as lightning strikes and storms), photovoltaic power grids will experience voltage drop failures. Voltage sag (sags / dips) refers to the sudden deviation of the voltage amplitude from the normal operating range at a certain moment, which will cause abno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/16
CPCH02J3/16H02J3/48Y02E40/30
Inventor 张阁肖静杨艺云肖园园司传涛梁朔周杨珺郭敏
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD