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EPO640 ASSIGNMENT OBJECTIVE Upon completion of this assignment, student should be able to determine AO1: the operation of two-pulse bridge circuit and DC machines, AO2: the input and the output voltage and current profiles of two-pulse bridge circuit in 1st and 4th quadrants drive. THEORETICAL BACKGROUND All driven machines require drives. Nowadays, these drives are principally single- or multi-motor drives. The single-drives are used for small or simple machines while the multi-drives are used for complex driven machines. Drives with electric machines which are fed and controlled via static converters are design as static converter drivers. The greater numbers of these drives are equipped with converter-fed DC commutator machines. Their power ranges from a few watts to several megawatts. The operation behavior of electric machines can be represented in the speed- torque characteristic. By relating speed and torque in a rectangular system of coordinates, four mode (four quadrants) operations can be represented. Breaking Motor operation In Driving Generator Operation REVISION QUESTION Unt ASSIGNMENT (SIMULATION) Driving Motor Operation IV Breaking Generator operation Figure 1. Operating modes of driving machines 2 I; M 1. Explain the operation of a. Rectifier - It converts a fixed AC voltage to a variable DC voltage. b. Inverter - It converts a fixed DC voltage to a fixed AC voltage with variable frequency. 2. How to control the fully-controlled converter.
EPO640 ASSIGNMENT (SIMULATION) SIMULATION RESULTS DISCUSSION QUESTIONS 1. Briefly describe the waveform obtained from the simulation result in term of; a. Input Voltage and Current b. The average DC voltage and DC current. 2. From the simulation, explain the operation of the converter and DC machines in both quadrants. 3. State the firing angle range for both 1st and 4th quadrant drive operation. 4. Explain the operation of generator and motor. CONCLUSION Conclude in detail the findings and the outcomes of this simulation exercise. This should include the summary of knowledge gained, comments and discussion of the results, errors and their possible sources and how this simulation exercise can be improved.
EPO640 3. Draw a single-phase fully-controlled converter with R load. Then, sketch the input and the output current and voltage of this converter during a = 45° 4. Based on Figure 1, explain the operating mode of 1st and 4th quadrant. MAIN QUESTION With the aid of a simulator tool (Matlab/PSIM etc.), simulate the workability of the 2 Quadrant Drive Rectifier from Figure 2. Table 1 will assist you in filling the recorded values obtained from the simulation. From the simulator tool plot each Voltage and Current Characteristic for each Upc/V. Answer the following question below; TABLE 1. CURRENT, VOLTAGE, POWER, TORQUE AND SPEED MEASUREMENTS Operation a Upc/ V Us/V (ms) Is/ A (ms) U V (average) U/ V (ms) WA (average) la A (rms) Ura/ V (ms) UV (mean) P/W n/ min¹ 1st Quadrant 90° 0 160 0.45 135 ASSIGNMENT (SIMULATION) 140 0.25 0.35 1.4 143 45 1400 100 150 1.1 -75 -125 0.85 1.5 1.03 -72.5 65 1024 4 Quadrant 155 145 145 1.5 -96 -145 1.3 1.5 1.38 -92.3 150 1344
EPO640 Lto- 120- Ub- NO PEO DC power supply (b) pont pon Trigger p Control un Transformer L30 NO (8) +15v +19% +10% ISV CH ME Us 300V KI 15V (d) Fully controlled two- pulse bridge K1 KA +&C+ M 300V Hafecycle Hove cycle 300V100SA Figure 2 50m 50 g & Mad 182 181 A 282 201 to 400 ASSIGNMENT (SIMULATION) Machine wy www www Isolating amper 220V DO Oscope 10