matlab report2 - Instrumentation and Measuring II...

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Instrumentation and Measuring II Matlab/Simulink Measuring Meter Simulation Study 2 Department: EEE Group members: CHIO WAI LON (DA927655) ZHANG YU ZHE (DA928269) Course code: ELEC352
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Data: 10/10/2011 Objective Creating Sub-systems of power parameter meter models are required in order to measure a) Active Power Meter, b) Reactive Power Meter, c) Apparent Power Meters by Arithmetic, Vector or Equivalent Apparent Power definitions, d) Distortion Power Meter and e) Power Factor by Matlab/Simulink. Procedure To compare the results and then make conclusions accordingly 1) Under the balance case : three-phase sinusoidal voltage (380 v, 50 Hz) and sinusoidal current with a balanced inductive load ( R = 5 ohms, L = 100m H) i. By using matlab simulation, the above case circuit is shown as below (the three- phase system we use was Y connection): Figure 1. The three-phase balance circuit. The voltage and current measured function was used to measure the phase voltage and current of the three-phase circuit. According to the value of voltage and current, the power factor could be found out by the subsystem which we had designed in matlab:
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Figure 2. The circuit for measuring the power parameters. The inner circuit of the subsystem in figure 2 was: Figure 3. The inner circuit of the subsystem which was created by matlab. The two inputs are voltage and current, the five outputs are power parameters. The fourier function is to measure the magnitude and angle of the signal. The RMS is obviously to measure the rms value of the signal. The voltage and current measurement function is just measure one of the phase because the power of three phase circuit was three times of that in one phase circuit. Therefore, the above inner circuit could be constructed according to the equations of the power parameter. Calculation
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In the calculation, it just needs to use one phase circuit to achieve the same results with three phase case by multiply three in the power.
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matlab report2 - Instrumentation and Measuring II...

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