Documentation

Digital Flickermeter

Implement digital flickermeter as described in IEC 61000-4-15 standard

Library

Control and Measurements/Measurements

Description

The Digital Flickermeter block implements a digital flickermeter as described in the IEC 61000-4-15 standard. The model implements the first four modules of the design. The statistical analysis (module 5) is implemented by an external function for offline analysis of recorded simulation signal.

Note

You must have a Control System Toolbox™ license to use the Digital Flickermeter block.

Parameters

Open statistical analysis

Opens the Statistical Analysis of Instantaneous Flicker Level module tool.

Network frequency

The frequency of the analyzed signal. Choose between 60 Hz and 50 Hz. The default value is 60 Hz.

Nominal input phase voltage (Vrms)

The nominal voltage value of the analyzed signal, in volts rms. The default value is 25e3/sqrt(3).

Maximum input voltage (pu)

The maximum input voltage value of the input voltage adaptor (module 1), in per unit. The default value is 5.0.

Maximum instantaneous sensation (pu)

The maximum value of the instantaneous flicker sensation measured by the block, in per unit. The default value is 1000.

Sample time (s)

The sampling rate used to compute the instantaneous flicker sensation. The default value is 0.001.

Scaling factor for sensation perceptibility

The scaling factor of the flickermeter for measuring the sensation perceptibility. The default value is 1.24e6.

Inputs and Outputs

enable

Set this input to 1 to enable the flicker measurement. The flickermeter is normally enabled after a given period of time, when the analyzed signal (input U) is stable.

U

Connect this input to the analyzed signal.

S5

Outputs the instantaneous flicker sensation measured for the analyzed signal.

m

This output contains these measurements:

Output 1: Half-cycle, rms-normalized voltage (pu)
Output 2: Weighted voltage fluctuation
Output 3: Square root of Output_5
Output 4: One-minute dose (integral) of instant perception
Output 5: Instantaneous flicker sensation (Output S5)
u: The analyzed signal
Init: initialization period time

Examples

The Flickermeter on a Distribution STATCOM example shows a flickermeter device that measures the instantaneous flicker sensation on the terminal voltage of a STATCOM unit.

The Flickermeter Statistical Analysis Module example shows a method to compute short-term flicker severity of a phase-to-ground voltage taken from one feeder of a given remote community.

References

[1] Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 15: Flickermeter – Functional and design specifications.,IEC-61000-4-15, 2003-02.

[2] Gutierrez, J. J., J. Ruiz, A. Lazkano, and L. A. Leturiondo. “Measurement of Voltage Flicker: Application to Grid-connected Wind Turbines.” In Advances in Measurement Systems, edited by Milind Kr Sharma, 365–380. InTech, DOI: 10.5772/8731, 2010. Available from: http://www.intechopen.com/books/advances-in-measurement-systems/measurement-of-voltage-flicker-application-to-grid-connected-wind-turbines.

Introduced in R2015b

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