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power system lecture and some problems
Typology: Lecture notes
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PhD. (Ongoing) Technical University Cottbus, Germany M.Sc. Electrical Power Engineering, (Germany) MBA, University of Sunderland, UK Senior Lecture, Department of Electrical and Electronic Engineering Uttara University, Bangladesh Power System: EEE 371 Credit Hours: 3 credits
Final Term focuses Topics:
Single line diagram of a power network
Single line diagram of a power network
Single line diagram of a power network
Single line diagram of a power network
The impedances of G 1 and T 1 are specified in per-unit on a base of 13 8 kV and 100 MVA, which is the same as the system base in Region 1.
The impedance of T2 is specified in per-unit on a base of 14.4 kV and 50 MVA in Region- 3
Step:-1: voltage level define Base power, ๐บ๐๐๐๐ = 100 MVA Base KV (voltage depend on transformer side)
https://electrical-engineering-portal.com/calculate-draw- single-line-diagram-power-system
Draw the electric circuit or reactance diagram , with all reactance's marked in per-unit (p.u.) values, and find the generator terminal voltage assuming both motors operating at 12 kV , three-quarters load, and unity power factor. Step: 25,000 kVA is chosen as the base S @ the generator end base voltage Vbase =13.8 kV is selected Here both transformer is rated at 13.2/
Step-2 & 3: zone or region selection by their kV Calculate the Generator Reactance (^) Transformer Reactance Transmission-Line Reactance The base MVA was 25000kVA But Its should be MVA as 1000 multiplied with (๐๐)^2
โ Another name is P-Q bus and at this bus, the active and reactive power is injected into the network. โ Magnitude and phase angle of the voltage are to be computed. the active power P and reactive power Q are specified. โ The load bus voltage can be permitted within a tolerable value, 5 %. The phase angle of the voltage , ฮด is not very important for the load.
This bus is also called the P-V bus, and on this bus, the voltage magnitude corresponding to generate voltage and true or active power P corresponding to its rating are specified. Voltage magnitude is maintained constant at a specified value by injection of reactive power. The reactive power generation Q and phase angle ฮด of the voltage are to be computed.
โ Slack bus (aka reference bus): the voltage magnitude is known and voltage angle=0, real and reactive power not known โ PV Bus: Real power and voltage magnitude known, reactive power and voltage angle unknown โ PQ Bus: Real and reactive power known, voltage angle and magnitude unknow Load Flow studies: Different Types of BUS
Slack bus in a power system absorb or emit the active or reactive power from the power system. The slack bus does not carry any load. At this bus, the magnitude and phase angle of the voltage are specified. The phase angle of the voltage is usually set equal to zero.
