NPRE 475 Spring 2024 HW3-3

What is the purpose of power factor correction to a given load? O To reduce the amount of voltage to the load. O To reduce the amount of dependence on automated machinery. O To reduce the amount of current to the load. O To reduce the amount of resistance of the load.

Which of the following statements regarding the cost structure of a wind farm are true? Select one or more: a. The turbine accounts for 40% of the total cost of an onshore wind farm. O b. About half of the total cost of an offshore wind farm consists of foundation, substation and cabling costs. c. Almost half of the total cost of a wind turbine is made up of the cost of a tower and blades.

2. a) Explain the terms load factor and diversity factor. b) Discuss the advantages of interconnected grid system. c) A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Calculate: (i) the maximum demand on the station, (ii) annual energy supplied by the station and (iii) suggest the installed capacity and the number of units.

power system

Analyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model.  Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.

3. A yearly load duration curve of a gas turbine power plant is a straight line from 50,000 to 5,000 kW. The load is taken by a power plant that consists of two units of 30,000 kW each and one unit of 20,000 kW. Determine: (a) Installed capacity (b) Plant factor (c) Maximum demand (d) load factor and (e) utilization factor of the plant.

A generating station has a maximum demand of 20 MW, a load factor of 60%, a plant capacity factor of 48% and a plant use factor of 80% Find: 1)the daily energy produced (2) the reserve capacity of the plant. (3) The maximum energy that could be produced daily if the plant was ruinining all the time.(4).Maximum energy that could be produced daily if the plant was running fully loaded and according to an operating schedule.

2. Explain the environmental impacts of wind power plant?

Cost of a 600 kW wind turbine is $ 550000. Other initial costs including that for installation and grid integration are 30 per cent of the turbine cost. Useful life of the system is 20 years. Annual O&M costs plus the land rent come to 3.5 per cent of the turbine cost. Calculate the cost of generating electricity from the turbine when it is installed at a site having a capacity factor of 0.25. The real rate of interest may be taken as 5 %.

TOPIC: Power Systems, Power Plants & IlluminationINSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM: A generating station has two 50 MW units each running for 8,500 hours in a year and one 30 MW unit running for 1,250 hours in one year. The station output is 650 x 106 kWh per year. Calculate the utilization factor. 0.732 0.653 0.811 0.795

step down chopper has Vs = 230 V and R = 10 0. For a duty cycle of 0.4, the power taken by the chopper is 2097 Watts. Find the chopper efficiency. Take the voltage drop across the chopper switch as 2 V. a) 98 % b) 89.96 % c) 99.14 % d) 96.54 %

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