Full exam for Electric Power Systems in the Energy Engineering degree programme at Politecnico di Milano. The document covers: Electric Power Systems Exam #5: 19/02/2021 1Β° Part Exercise 1 Consider a generation plant made of two identical synchronous machines connected in parallel to the plant terminals as shown in the figure bellow, where πππ and πππ are the total real and reactive power,
Full exam for Electric Power Systems in the Energy Engineering degree programme at Politecnico di Milano. The document covers: Electric Power Systems Exam #5: 19/02/2021 1Β° Part Exercise 1 Consider a generation plant made of two identical synchronous machines connected in parallel to the plant terminals as shown in the figure bellow, where πππ and πππ are the total real and reactive power,
Import quality: text was extracted directly from the original document.
Representative passages recognised in different parts of the material. The full extracted text remains available to search, while this compact preview makes the page easier to read.
Electric Power Systems Exam #5: 19/02/2021 1Β° Part Exercise 1 Consider a generation plant made of two identical synchronous machines connected in parallel to the plant terminals as shown in the figure bellow, where πππ and πππ are the total real and reactive power, respectively. Each synchronous machine is characterized by: Nominal apparent power 30 MVA Nominal operating voltage (line-to-line) 15 kV Phase synchronous reactance 21 Ξ© Maximum turbine mechanical power 26 MW emf πΈ0 (phase-to-ground) at maximum excitation current 10 kV Stator windings connection Y (star) In normal operating conditions the voltage at the plant terminals is equal to the nominal volta ge of the synchronous machines, while SG1 is operated with an emf of πΈ01 = 9.2 ππ and a load angle of πΏ1 = 15 + π΅Β° and SG2 is operated with an emf of πΈ02 = 7.2 + 0.1 β π΅ ππ and a load angle of πΏ1 = 0Β°. 1. compute the total active (πππ) and the total reactive power (πππ), respectively, supplied by the plant to the external network Ext Net; 2. compute the emf (πΈ0) and the power angle (πΏ) for each of the two synchronous generators of the plant when the two are equally loaded; 4. for the operating conditions identified at point 2 check the capability limits for both sync hronous generators of the plant; 5. considering the operating conditions identified at point 2 determine the maximum reactive power that the plant can supply to the external network. In the above data, N is the last number of the studentβs Person Code/Codice Persona (e.g. if Person Code is 10381486 then N = 6); Please substitute accordingly. Exercise 2 Consider the following electrical network Line xl [pu] L1 0.035 L2.1 0.02 L2.2 0.015+0.05β π΅ Generator G Real power output: PG Operating voltage: VG [pu] [pu] G 10 0.98 Demand D Absorbed apparent power:β¦
First page of the document.
