School of Electronic, Electrical and Systems Engineering MSc in Electrical Power Systems 2014-2015 Assigment.1 Power System Operation and Control Newton-Raphson and Decoupled Newton-Raphson Power Flow Solutions using MATLAB ID: 1501113 Summary The power flow analysis involves the calculations of power flows and voltages of a transmission network for specified terminal or bus condition. Such calculations are required for the analysis of steady-state as well as dynamic performance of power systems [1]. The power flow is also called load flow. Some classification should be represented before carry out the analysis of power flow. Such as, the bus classifications or types like voltage-controlled bus (PV), load bus (PQ) or slack bus (Swing). In addition to that, the representation of network elements should be considered and the magnitude calculated in per unit. The iterative techniques are used to solve the power flow equations such as Gauss-Seidel, Newton-Raphson and Decoupled Newton-Raphson methods. Each method has its equations and principle to reach the solution. The difference between them appeared in which method is more accurate and fast to get the results. The system which assigned to be solved by Newton-Raphson and Decoupled Newton-Raphson methods includes two-bus. Bus.1 is slack bus where voltage is given and bus.2 is a PQ bus where load power is given. The impedance of the transmission system between bus.1 and bus.2 is given. To calculate the power flow

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