Power Values 3Ph
The Power Values module calculates the power values of the connected loads. These include the fundamental components and the phase shift angle. Internally, the individual harmonics and their phase angle are determined for the calculations.
Alternatively, the Power Values Period module can be used for the calculation. It uses simpler calculation methods for enhanced dynamics.
In the Beckhoff Information System you will find the documentation for the corresponding PLC function block FB_PMA_PowerValues_3Ph.
In the Beckhoff Information System you will find the documentation of the TF3650 TwinCAT 3 Power Monitoring function with descriptions of the corresponding PLC library.
Configuration parameters
- FFT Length: Length of the FFT. It must be greater than one and an integral power of two.
- Window Length: Length of the analysis window in samples. The length must be greater than one and an even number. It must not be greater than FFT Length.
- Sample Rate [Hz]: Sample rate (samples per second) of the input signal.
- Base Frequency: Frequency of the first harmonic in Hz.
- Num Bands: Specifies the number of bands for which the RMS is calculated.
- Bandwidth: Total bandwidth of a single RMS band.
- Window Type: Defines the window function used. The window type HannWindow is a good default value. The windowing can be switched off by the use of the window type RectangularWindow. See: E_PMA_WindowType
- Min Input Current [A]: Minimum input value (RMS) of the current. This parameter prevents the calculation of input values that are too small.
Input values
- Input Voltage 1 .. Input Voltage 3: Input values of the voltage.
- Input Current 1 .. Input Current 3: Input values of the current.
- Reset Statistics (optional):
TRUEresets the min. and max. values of the outputs.
Output values
- Apparent Power: Total apparent power.
- Apparent Power 1: Fundamental apparent power.
- Active Power: Active power.
- Reactive Power d: Distortion reactive power.
- Reactive Power 1: Fundamental shift reactive power.
- Total Reactive Power: Total reactive power.
- Phi: Phase shift angle.
- Cos Phi: CosPhi (active power/fundamental apparent power).
- Power Factor: Power factor (active power/total apparent power).
- Power Quality Factor: Represents the quality of the power supply simplified in a value range between 0 and 1. The frequency, the RMS value of the voltage and the THD of the voltage are also included.
- Energy Pos: Energy in positive direction.
- Energy Neg: Energy in the negative direction.
- Energy Res: Resulting energy.
- Sum Apparent Power: Sum of the total apparent power of all phases.
- Sum Active Power: Sum of the active power of all phases.
- Sum Total Reactive Power: Sum of the total reactive power of all phases.
- Sum Reactive Power 1 Res: Sum of the values of the fundamental shift reactive power of all phases.