1 application background
With the rapid development of the domestic electric vehicle industry, under the same road environment and driving conditions, it is particularly important to increase the overall cruising range of electric vehicles and improve occupant satisfaction with electricity demand during driving. In this regard, it is necessary to collect AC and DC voltage and current signals during the test to calculate the parameters related to the electric power output and consumed by various components of the vehicle.
In this regard, Germany IPETRONIK has launched a new corresponding function for electric power calculation in the data acquisition software - IPEmotion .
Two main functions
1. Power calculation:
For AC power calculations, the following functions are available in postprocessing operations:
The electric power calculation formula provides the following operations:
2. Input channel settings:
For the configuration of the electric power calculation formula, it is very necessary to correlate the input channels of voltage and current. For this, a source voltage channel and a source current channel need to be introduced.
Some characteristics can be calculated with only one input channel, such as root mean square value RMS and total harmonic distortion THD are suitable for this calculation method.
3. Power calculation settings:
Power calculation settings:
■ Line frequency mode:
• Predefined: 50 or 60Hz. The line frequency is referenced to the fundamental frequency of the AC grid. The frequency of the utility can be predefined when the network and generation facility type are known.
• Free mode: In free mode you can set the frequency to suit your DUT and grid.
• Detect mode: Run the detect function if you do not know the line frequency. The result of detecting the frequency is provided in the frequency channel.
■ Frequency source:
You can define if you want to use the voltage or current channel to calculate the frequency.
■ Number of cycles:
This number defines how many frequency cycles are included in the characteristic calculation. For a 50Hz fundamental frequency, 10 cycles are recommended; for a 60Hz fundamental frequency, 12 cycles are recommended.
Example: At a fundamental frequency of 50Hz, one cycle takes 20ms. Computed features are provided every 200 milliseconds. As you increase the number of cycles, the accuracy of the results gets better, but you get fewer sampling points for the characteristic results.
■ Nominal voltage (nominal voltage):
The nominal voltage of the signal, defining the reference value. At the same time, this is also the peak of the signal.
■ Maximum load current (maximum load current):
Here you define a reference value for the upper limit of the signal current, you can also use static operation to determine the upper limit for voltage and load current.
Three practical test applications
Fengqiu Technology provides a complete electric power measurement and calculation solution - the use of analog modules together with high-voltage isolation modules can not only better collect high-voltage voltage and current signals, but also ensure the personal safety of testers.
1. Hardware products:
■ High pressure shunt: IPETRONIK HVshunt2
Product Description:
• Applications for electric and hybrid vehicles;
• High voltage input, the upper limit is 850VDC;
• Through the current transformer, the current measurement can reach ±900A DC;
• Customer-specific plug for connection to the high-voltage network;
......
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