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Variable slope droop control method with low-voltage early warning function

A control method and low-voltage technology, applied to electrical components, circuit devices, DC network circuit devices, etc., can solve problems such as the inability to determine the absolute value of remaining power, and achieve the effect of simple settings

Inactive Publication Date: 2021-04-30
丽水市普明电力建设工程有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the absolute value of the remaining power cannot be determined at present, and a variable slope droop control method with low voltage warning is provided, which issues a warning in the low voltage state

Method used

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  • Variable slope droop control method with low-voltage early warning function
  • Variable slope droop control method with low-voltage early warning function
  • Variable slope droop control method with low-voltage early warning function

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A variable slope droop control method with low voltage warning, such as figure 1 shown, including:

[0046] Taking the active power output by the AC / DC converter as the independent variable and the DC grid voltage as the dependent variable with a slope of -K, draw the initial droop control curve; the specific process of drawing the initial droop control curve is

[0047] Record the allowable maximum operating voltage U of the DC grid 1 , DC power grid allowable minimum operating voltage U 2 And the rated current I of the DC side of the AC / DC converter e ;

[0048] Calculate the highest power P of the AC / DC converter 1 and minimum power P 2 ; AC / DC converter maximum power P 1 The calculation formula is

[0049] P 1 =I e * U 1 ;

[0050] AC / DC converter minimum power P 2 The calculation formula is

[0051] P 1 =I e * U 1 .

[0052] By determining the two endpoints and connecting them, a line segment with a slope of -K is obtained, which is the initial dro...

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Abstract

The invention discloses a variable slope droop control method with the low voltage early warning function; the method comprises the following steps of: drawing an initial droop control curve by taking active power output by an AC / DC (Alternating Current / Direct Current) converter as an independent variable and taking a direct current power grid voltage as a dependent variable; arranging an inflection point above the initial droop control curve, and respectively connecting two end points of the initial droop control curve with the inflection point to construct a voltage-power droop function. The method has the advantages that the inflection points are arranged in the initial voltage droop curve, and the situation that no residual power is still output, and consequently voltage collapse happens to a direct-current power grid is prevented; and 2, the minimum voltage limit value of the output end is simple to set, thereby preventing the limit value from being too high to reduce the system utilization rate and preventing the limit value from being too low to reduce the system reliability;.

Description

technical field [0001] The invention relates to the field of converter control, in particular to a variable slope droop control method with low voltage warning. Background technique [0002] Photovoltaic power generation and electric vehicle charging piles are connected through a DC grid, which can avoid multiple conversions from DC to AC and AC to DC, and improve power efficiency. In order to improve the reliability of the DC grid, the DC grid is usually connected to the AC grid through an AC / DC converter. In the DC power grid, if there are multiple AC / DC converters running in parallel, a master-slave control method can be adopted, one AC / DC converter controls the DC voltage, and the other controls the power; distributed control can also be used , that is, each AC / DC converter adopts a voltage-power droop control method. [0003] For example, the Chinese patent publication number is CN105896517A, a voltage droop control method for a DC power grid, which performs topology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 徐路遥徐习东王裕民龚海炜廖蔚斌朱文槐
Owner 丽水市普明电力建设工程有限公司
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