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Which of the following buses are used to form bus admittance matrix for load flow analysis? 1. Load bus 2. Generator bus 3. Slack bus

Which of the following buses are used to form bus admittance matrix for load flow analysis? 1. Load bus 2. Generator bus 3. Slack bus Correct Answer 1, 2 and 3

There are three types of buses.

  • Load bus
  • Generator nus
  • Slack bus


All the three buses are used to construct the bus admittance matrix for load flow analysis. For a n-bus system, the size of the bus admittance matrix is n × n.

Important Points:

The quantities specified for different type of buses shown in the below table.

Type of bus

Specified quantities

Unknown quantities

Generator bus (PV bus)

P, |V|

Q, δ

Load bus (PQ bus)

P, Q

|V|, δ

Slack bus

|V|, δ

P, Q

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