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Unformatted text preview: ELEC352 Electronic Instruments and Measurements II Laboratory Report Simulation Three Phase System Name: GUO ZENGBIN CHANG WENG LAM Student ID: DA 927098 DA 827696 Department: EEE Section Number: Section A Objective Creation subsystem of power parameter models are required in order to measure A) active power meter, B) reactive power meter, C) apparent power meters by one of the following methods, 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 : threephase sinusoidal voltage (380 v, 50 Hz) and sinusoidal current with a balanced inductive load (R = 5 ohms, L = 100m H). i. Measure power parameters, Fig.1 the circuit diagram RL circuit with three phase voltage sources Using simulink program to build up Fig.1 and we can get the Fig.2 Fig.2 the circuit diagram of simulink with three phase voltage source After simulation, we use the subsystem to combine the power parameter meter part that will be easy to standard, and we can get the value of power parameters. It is shown in Fig.3 Fig.3 the value of power parameter with using simulink. We also use the hand calculation method then compare each other error. The hand calculation method is shown in following steps. We simplify the three phase connection to one phase connection ( Fig.4 ). Fig.4 the circuit diagram of Phase A Calculation: , , , Follow above base we can get the value of power factor (pf), active power, reactive power, apparent power in below: , , , We use the Table.1 to compare with the simulation: Power parameter Simulation Hand Calculation Percentage error (%) Active power(W) 2105 2138.8 1.580325 Reactive power(VAR) 13440 13443.17 0.023581 Apparent power (VA) 13610 13623 0.095427 Distortion power(VA) 357 541.11 34.02451 Power Factor 0.1547 0.157 1.464968 Table1. Compare two different methods ii. Try to connect a capacitor in parallel with the load and measure power parameters again. We need to change into active power to reactive power from the following equation; we can get the value electrical reactance. Then we can know the capacitor value is Fig.5 the structure of circuit with compensation In the simulation software, we need series a resistor with a capacitor, because if it is have resistor inside the compensation, according to this equation. We can produce a huge of current pass through capacitor. So that we select the value of resistor is 0.1.so that we can build up the circuit diagram is shown in Fig.6 Fig.6 the circuit diagram of simulink with three phase voltage source after compensation Fig....
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 Spring '12
 Terry

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