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**POWER SYSTEM ENGINEERING**

CE Module Lecturer Vijayendra Kumar APIIT SD INDIA

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**POWER SYSTEM ENGINEERING**

CE POWER SYSTEM ENGINEERING Tutorial 1

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**Bus Admittance Matrix or Ybus**

First step in solving the power flow is to create what is known as the bus admittance matrix, often called the Ybus. The Ybus gives the relationships between all the bus current injections, I, and all the bus voltages, V, I = Ybus V The Ybus is developed by applying KCL at each bus in the system to relate the bus current injections, the bus voltages, and the branch impedances and admittances. Mechanical Science EE

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Ybus Example Determine the bus admittance matrix for the network shown below, assuming the current injection at each bus i is Ii = IGi - IDi where IGi is the current injection into the bus from the generator and IDi is the current flowing into the load. Mechanical Science EE

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Ybus Example… cont’d Mechanical Science EE

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Ybus Example… cont’d for a system with n buses, ybus is an n by n symmetric matrix (i.e., one where ybuskl = ybuslk).from now on, we will mostly write y for ybus, but be careful to distinguish ykl from line admittances. Mechanical Science EE

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Ybus General Form The diagonal terms, Ykk, are the “self admittance” terms, equal to the sum of the admittances of all devices incident to bus k. The off-diagonal terms, Ykl, are equal to the negative of the admittance joining the two buses. With large systems Ybus is a sparse matrix (that is, most entries are zero): sparsity is key to efficient numerical calculation. Shunt terms, such as in the equivalent p line model, only affect the diagonal terms. Mechanical Science EE

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Two Bus System Example

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Using the Ybus

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**Solving for Bus Currents**

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**Solving for Bus Currents**

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ECE 476 Power System Analysis Lecture 11: Ybus, Power Flow Prof. Tom Overbye Dept. of Electrical and Computer Engineering University of Illinois at Urbana-Champaign.

ECE 476 Power System Analysis Lecture 11: Ybus, Power Flow Prof. Tom Overbye Dept. of Electrical and Computer Engineering University of Illinois at Urbana-Champaign.

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