The necessary equation to be solved during the load flow analysis using Fast-Decoupled method is given below:where B' and B'' are formed using the imaginary part of the bus admittance matrix, Ybus. If the system consists of 6 buses of which one of the bus is slack bus and 2 bues are voltage regulated buses, then then the matrix B' is of order ____and the matrix B'' is of order____, respectivity.∆P/|Vi| = - B'∆δ∆Q/|Vi| = - B''∆|V|

• A. 3 and 6
• B. 3 and 5
• C. 6 and 3
• D. 5 and 3

Answer: (D)

In Fast-decoupled method,
Order of B' = No. of PV buses = 5

Order of B'' = No. of PQ buses = 3