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Step signal detection method for filtering of double sliding windows with dead zone unit

A technology of step signal and detection method, applied in the direction of variable measurement arrangement, measurement device, instrument, etc., can solve the problem of false detection, inability to accurately detect the signal step mutation value, etc., to filter out the interference signal. Effect

Active Publication Date: 2014-04-16
KEHUA DATA CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the traditional sliding window filter, before and after the signal step, the sliding window filter will smooth the step signal, and cannot accurately detect the signal step mutation value (the difference before and after the mutation), only before and after the step can be detected The average value of , there will be false detection phenomenon

Method used

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  • Step signal detection method for filtering of double sliding windows with dead zone unit
  • Step signal detection method for filtering of double sliding windows with dead zone unit
  • Step signal detection method for filtering of double sliding windows with dead zone unit

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and related drawings.

[0033] The invention provides a step signal detection method with a double sliding window filter with a dead zone unit, comprising the following steps:

[0034] S01: Provide a digital filter, the digital filter sets an array A, a dead zone unit B, and an array C in sequence; the array A includes at least one storage unit a(1), a(2)...a( n), n is a positive integer and n≥1, the array C includes at least one storage unit c(1), c(2)...c(m), m is a positive integer and m≥1, the digital filter The device is also provided with a first storage unit;

[0035] S02: Clear the array A, the dead zone unit B and the array C, and store a mutation value Δref into the first storage unit;

[0036] S03: In the current sampling period, the digital filter samples an analog sign...

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Abstract

The invention relates to a step signal detection method for smoothing of double sliding windows with a dead zone unit. In a fixed cycle, an input signal is sampled, sample data are sequentially shifted into the double sliding windows with the dead zone B according to sampling time, meanwhile the data in the sliding window A and the sliding window C are averaged, the average value of the sliding window A and the average value of the sliding window C are respectively calculated, and a difference value between the average values of the two sliding windows is calculated and serves as a mutation value; when the input signal mutates, the mutation value can be immediately detected after sliding for the time of one sliding window. Due to the facts that the difference value between the average values of the two sliding windows is appropriately arranged and the length of the sliding windows is appropriately arranged, the mutation detection requirement for mutation duration time can be accurately achieved.

Description

technical field [0001] The invention relates to a step signal detection method, in particular to a step signal detection method with a dead zone unit double sliding window filter. Background technique [0002] In the photovoltaic grid-connected power generation system, the leakage current produced suddenly changes step by step. These abrupt leakage currents will cause harm to the photovoltaic grid-connected inverter. When the leakage current has a certain step change, it is necessary to Inverter off-grid protection. Specifically, when the leakage current mutation value (that is, the difference before and after the mutation) is higher than a specific value and the mutation lasts for a certain period of time, the detection of the mutation phenomenon plays an important role in the off-grid protection of the grid-connected inverter. That is, when the leakage current detection protection has a step time requirement, when the duration of the step mutation is T1 and the leakage cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D1/18
Inventor 苏宁焕陈四雄张少育苏先进
Owner KEHUA DATA CO LTD
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