A method and device for suppressing voltage fluctuations at public grid-connected points

A voltage fluctuation and grid voltage technology, applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve the hidden dangers of grid safety and stability, output power uncertainty and other issues, and achieve the effect of suppressing voltage fluctuations

Active Publication Date: 2017-12-22
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the installed capacity of new energy continues to increase, it brings hidden dangers to the safety and stability of the power grid.
Since the output power of photovoltaic power generation and wind power generation varies with the sunshine intensity and wind speed respectively, the output power is uncertain

Method used

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  • A method and device for suppressing voltage fluctuations at public grid-connected points
  • A method and device for suppressing voltage fluctuations at public grid-connected points
  • A method and device for suppressing voltage fluctuations at public grid-connected points

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Embodiment 1

[0044] see figure 2 , which is a flow chart of Embodiment 1 of the method for suppressing voltage fluctuations at common grid-connected points provided by the present invention.

[0045] The method for suppressing voltage fluctuations at public grid-connected points provided in this embodiment includes:

[0046] S201: Detect the voltage and active power P of the public grid-connected point;

[0047] S202: Obtain voltage fluctuation ΔV=Vs-Vp from the voltage amplitude Vp of the public grid-connected point and the grid voltage amplitude Vs;

[0048] Generally, the remote equivalent grid voltage is not easy to obtain, and can be replaced by the target voltage to be controlled by the PCC point, that is, Vs is a known quantity in this embodiment.

[0049] It should be noted that, theoretically, the voltage at the PCC point should be equal to the magnitude of the grid voltage, but the phases of the two are different. When the voltage at the PCC point fluctuates, the amplitude of...

Embodiment 2

[0060] see image 3 , which is a flow chart of Embodiment 2 of the method for suppressing voltage fluctuations at public grid-connected points provided by the present invention.

[0061] The method for suppressing the voltage fluctuation of the common grid-connected point provided in this embodiment, S301-S302 and S201-S202 are respectively the same, and will not be repeated here.

[0062] S303: Perform high-frequency signal filtering on the ΔV / P.

[0063] It should be noted that ΔV / P may contain high-frequency harmonic signals, and then judge whether the absolute value of ΔV / P converges after filtering out the high-frequency signals.

[0064] S304: The ratio ΔV / P of the voltage fluctuation ΔV to the active power P is adjusted to generate a control coefficient k ref ,Specifically:

[0065] The control coefficient k is generated from the ratio ΔV / P of the voltage fluctuation ΔV to the active power P through proportional-integral PI regulation, integral I regulation or propor...

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Abstract

The invention discloses a method and a device for suppressing voltage fluctuations of a public grid-connection point. The method comprises the steps of: detecting a voltage and an active power P of the public grid-connection point; acquiring a voltage fluctuation quantity DeltaV=Vs-Vp on the basis of a voltage amplitude Vp and a power grid voltage amplitude Vs of the public grid-connection point; generating a control coefficient k(ref) through adjusting a ratio DeltaV / P of the voltage fluctuation quantity DeltaV to an active power P; and outputting reactive power Qi=Pi*k(ref) by each grid-connection subsystem according to the control coefficient k(ref) and the current active power Pi of the grid-connection subsystem, wherein i=1,...n, and n is the number of the grid-connection subsystems. Therefore, the method can control the reactive power output by each grid-connection subsystem through detecting the voltage and active power of the public grid-connection point, further suppresses the voltage fluctuations of the public grid-connection point, is simple and practicable, and is applicable for inductive impedance and capacitive impedance.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to a method and device for suppressing voltage fluctuations at public grid-connected points. Background technique [0002] With the continuous depletion of fossil fuels, new energy sources such as wind power and photovoltaic power generation have been paid more and more attention. However, with the continuous increase of new energy installed capacity, it has brought hidden dangers to the safety and stability of the power grid. Since the output power of photovoltaic power generation and wind power generation varies with the sunshine intensity and wind speed, the output power is uncertain. When the output power of photovoltaic power generation and wind power generation systems fluctuates, the current injected into the grid from the public grid-connected point will change accordingly, which will cause the voltage drop on the grid impedance to change, so that the public grid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 邹海晏陶磊潘年安丁杰
Owner SUNGROW POWER SUPPLY CO LTD
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