Which are the advantages of an open-loop system I. Accurate response II. Less time for maintenance II. Reliable IV. Inexpensive III and IV
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- The ---_characteristi cs shows the relation between the generated e.m.f at no load and the field current. O a. internal b. non-magnetic C. external d. magneticShunt capacitor bank compensation for power factor improvemen . (Give short report about this topic around 250 word)Where can you find a ground in Multisim Live Online Circuit Simulator? а. Electromechanical b. Modeling Blocks С. c. Schematic Connectors d. Indicators
- A single phase Cycloconverter, if the input supply voltage is Vs= 220 V with frequency (f= 50 Hz) and the trigger angle (a= 45°), the conduction angle (0=168°) and the load is (R=10 2 in series with L= 18.377 mH). Then determine the followings:- I 1) Draw the Cycloconverter circuit. 2) Determine the value of load angle (Þ). 3) Determine the value of the commutation angle (3). 4) Draw to scale the input voltage and current, the output voltages and the current waveforms. 5) Determine the mean and rms values of the output voltage.Electricity Distribution Network - What are the UK power distribution network voltage levels? Why there is the need for a distribution management system in electric power distribution networks? Power System Operation and Control - State three reasons why it is important to maintain the supply frequency within statutory limits for a power system. Power System Operational Issue - Briefly discuss what are the major power quality issues, particularly in power-electronic-interfaced Microgrid systems. New Electricity Demand - Briefly explain the concept of plug-in hybrid electric vehicle technology and its challenges to the power grid. Power System Operational Issue - Briefly explain the concept of Dynamic Network Rating (DNR), and what are the major benefits for electricity distribution networks and distribution network operators (DNOs). Electricity Network Operation with High Penetration Level of Renewables Although wind power is seen as offering many countries the potential to reduce…The figure below shows the one-line diagram of a four- bus power system. The voltages, the scheduled real power and reactive powers, and the reactances of transmission lines are marked at this one line diagram (The voltages and reactances are in PU referred to 100 MW base. The active power P2 in MW is the last three digits (from right) of your registration number (i.e for the student that has a registration number 202112396, P2 =396). [10] Starting from an estimated voltage at bus 2, bus 3, and bus 4 equals V2 (0) = 1.15<0°, V3 = 1.15 < 0°, V4 1.1< 0°. 1- Specify the type of each bus and known & unknown quantities at each bus. 2- Find the elements of the second row of the admittance matrix (i.e. [Y21 Y22 Y23 Y24]). 3- Using Gauss-Siedal fınd the voltage at bus 2 after the first iteration. 4- Using Newton-Raphson, calculate: |- The value of real power (P2), at bus 2 after the first iteration. Il- The second element in the first row of the Jacobian matrix after the first iteration. 2 P2…
- To qualify system stability, we use: a. Routh criterion b. Phase margin c. Gain and phase margin d. Gain margin1-Alternators can be overloaded by 10 percentage for 10-15 minutes, this a. Steady state voltage stability will get affected b. may reduce the stability limit c. may disturb Nose point d. may lose Angular stability 2-Often, the network is referred as an infinite bus when a change in input mechanical power or in field excitation to the unit does not cause an appreciable change in a. system frequency or terminal voltage b. system frequency alone c. system frequency and terminal voltage d. Total production costReconsider Problem 3.29. If Va,VbandVc are a negative-sequence set, how would the voltage and current relationships change? (a) If C1 is the complex positive-sequence voltage gain in Problem 3.29 and (b) if C2 is the negative sequence complex voltage gain, express the relationship between C1andC2
- Define derating, why must a 60Hz generator be derated if it is to be operated at 50Hz? Find percentage of derating done. (4) A generator connected with an infinite bus bar, the frequency indicator shows that frequency is decreasing from 50Hz. What action you will take for restoration of frequency. (2) A generator is loaded with certain load, and its voltage regulation is very poor. What are various ways by which you can improve its regulation? (2)Discuss the concept of load shedding and its importance in power system management.The term brute-force method is used in your reading material in reference to a. cable installation on b. the I/0 track replacement of relays grounding с. d.