With the development of science, the use of frequency conversion technology is becoming more and more extensive, and frequency conversion technology is used in both industrial equipment and household appliances. In recent years, inverter air conditioners have been fired very hot. Inverter air conditioners have the advantages of low noise and low power consumption. More commercials have slogan of inverter air conditioners that consume only one kilowatt per night. Is this true?
The core of inverter air conditioner is frequency conversion controller and variable frequency motor. The energy efficiency of inverter air conditioner is largely determined by them. Therefore, to improve the energy efficiency of inverter air conditioner, the core is to improve the efficiency of air conditioner inverter controller and variable frequency motor, then the problem How to achieve high-precision energy efficiency evaluation of inverter air conditioner inverter controller and motor?
If high-precision energy efficiency evaluation of the variable frequency drive system is required, the following four conditions must be met:
First, the power measuring instrument must have sufficient bandwidth
It is well known that the inverter works in chopping mode. At present, SPWM is used more. The so-called SPWM is to change the modulation pulse mode on the basis of PWM. The pulse width time duty ratio is arranged according to the sine law, so that the output waveform is properly The filtering can achieve a sine wave output. The PWM frequency is generally in the range of a few KHz to tens of KHz. According to mathematical modeling analysis, if the PWM signal is to be accurately measured, the instrument bandwidth is at least 200 times higher than the carrier signal of the inverter.
The PA6000 series power analyzers have a bandwidth of up to 1MHz (5MHz for the PA8000) and a flatter bandwidth curve, making them ideal for accurate measurement of such signals.
Second, accurate measurement of voltage and current values
High precision is the guarantee of accurate measurement efficiency. PA series power analyzer has 0.01% measurement accuracy, and can capture small dynamic characteristics changes in the efficiency evaluation test of variable frequency motor drive system.
Third, accurate measurement of voltage, current phase difference
The PA series power analyzer adopts 100M synchronous clock with high stability temperature compensation to realize synchronous sampling. The synchronous sampling clock error is less than 10 ns, which meets the extreme testing requirements of high efficiency variable frequency motor drive system efficiency.
Fourth, realize the simultaneous measurement of input and output signals
The PA series power analyzer can perform measurement of up to 6 power input channels and +1 motor input channels, thus achieving synchronous measurement of inverter input-motor input-motor parameters, further improving the accuracy of efficiency testing.
In addition, Zhou Ligong Zhiyuan Electronics has broken the traditional performance bottleneck of the traditional dynamometer by virtue of its in-depth understanding in power analysis, motor measurement, and long-term accumulation, integrating the concept of instrument design and system integration, and launched the epoch-making MPT1000 series hybrid type. The motor test system enables simultaneous measurement of motor performance characteristics and control characteristics. Has been successfully applied to the test of air conditioner motor and air conditioner variable frequency drive.
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