Performance Analysis of Three Phase Induction Motor based on ATV12HU15M2 Inverter for Control System Practicum Module

Understanding that electrical engineering graduates who have experience and are able to know the electric power system in the industry are the main thoughts of the writer to conduct research. Through the manufacture of a three-phase ac motor control practicum module, which is the type of motor most often used in industrial activities, is expected to provide more knowledge to prospective graduates of electrical engineering engineers. The author determines the two previous research categories chosen as references, namely the training of electric motor modules and the final project of electrical engineering students. In this study the ATV12HU15M2 inverter is used to control changing the frequency value as an input variable to determine its effect on output variables such as voltage, current, power, rpm, and THD. Equipped with SoMove software that is connected to the laptop to be able to change the value of input variables such as motor power, number of poles, and power factors to match the specifications of the electric motor used, the software can also monitor if an error occurs in the system. At the measurement stage, the measuring instrument used is a Power Analyzer to measure the input power of a single-phase system at the source grid PLN, the output power of a three-phase electric motor system, and experimental measurements of motors coupled with a dc generator. For the purposes of data processing, DataView software is used to display the measurement results into a laptop, the resulting display can be in the form of a waveform graph, a graph of THD occurrence, and power information for which the displayed data can be stored. The THD result most optimal at 50Hz frequency with THDv value 18.69% and THDi value 9.04%. Keywords— measurement, monitoring, three phase ac motor, ATV12HU15M2 inverter


I. INTRODUCTION
Until now, a number of universities still get complaints from industry about the extent of the capabilities of technical graduates when starting certain jobs. Most questioned about the inability of engineering graduates to be able to adapt to the industrial environment. Even worse, there are skills mismatches during the industrial training period that workers have. Occurs because industrial training materials are not relevant to what workers learn in college. This is the responsibility of the university to be able to provide significant and useful industrial training for its students.
In the implementation of practicum in a laboratory, a module which has been integrated is needed so that students can more easily understand and master electricity skills comprehensively. One of the modules that is most needed by the Laboratory of Energy Conversion and Electric Power Systems in an effort to provide industrial application practices is the induction electric motor module. An electric motor module consists of an electric motor driver, control panel and monitoring equipment as well as an induction motor load.

II. METHODS
The inverter is equipped with SoMove Software as a driver set up. Power Analyzer Measurement Tool as a measurement of research. Storage of measurement data using DataView Software. The method begins with making a three-phase AC motor control circuit. After that, controlling the frequency variable values. Then the next step is to measure and process data to the computer.

A. Induction Motor
Induction motor works based on the electromagnetic induction that occurs in the stator coil to the rotor coil. Flux is induced from the stator coil will cut the rotor coil resulting in electromotive force (emf) or called an induced voltage. The induction works based on the electromagnetic induction that occurs in the stator coil to the rotor coil.
Induction motor rotation speed can be determined by the equation: which means, the synchronous speed (Ns) adjustment of an induction motor can be done by adjusting the frequency (f) of alternating sources, while changing the number of motor poles (P) is considered impractical.

Fig 1. Graph of the influence of frequency on speed
The basic difference between synchronous and asynchronous motors is the asynchronous motor slip occurs. Where slip is the occurrence of differences in the value of rotation on the stator and the value of rotation on the rotor.
to make a synchronous motor, the stator speed value is the same as the rotor speed value. Therefore 100% compensation slip is used to meet the equation, so that a slip of zero can be obtained.

B. Single Phase and Triple Phase Power
Single phase power measurement is performed on grid power input from PLN Active power (P) single phase = V I cos φ Three-phase power measurements are carried out at the output power output of the electric motor Active power (P) three phases = √3 V I cos φ Not all electric power absorbed by an induction motor turns into mechanical power, some of it is lost in the form of thermal power. Efficiency value is a function of the ratio of mechanical power to electric power.

C. AC Driver
AC Driver Components consist of: 1) Converter circuit from AC to DC 2) DC Wave Filter 3) Inverter circuit from DC to AC.
The existence of this circuit causes harmonic distortion due to the influence of the electronic components.
Total Harmonic Distortion of the voltage used equation: Total Harmonic Distortion of the current used equation:

Fig 2. Total Harmonic Distortion
Displacement power factor (DPF) is the ratio between active power (W) to pseudo power (VA) in the base wave. While the power factor is the ratio between active power and apparent power on composite waves including inductive effects by harmonic components.
The DPF value will be the same as the PF if in the sinusoidial V and I linear circuits.

Picture 3. Illustrations of Measurement
A. The Effect of Frequency to THD

Picture 5. Current Graphic on Single Phase
In the condition of the PLN input grid voltage THD values tend to be stable. The THD value of a fluctuating current is possible because the current value is not large enough. Further research can be done on the measurement of loading experiments, which in this study, the output value of the loading of a DC generator is not valid enough, because the AC motor coupling to the asynchronous DC generator causes the motor to not be able to spin as it should to reach the specified conditions. Current values below 0.5A cannot be read precisely, to minimize fluctuations in current data readings, it requires setting clamp with a smaller range.