Implementation of PQ Method for Power Flow Calculation in Power Systems Using MATLAB

In the following text, we will explain how to implement the PQ method for power flow calculation in power systems using MATLAB. Power flow calculation is a critical process that helps compute parameters such as node voltages, currents, and power flows across the system to ensure stable operation. The PQ method is a widely used iterative technique for determining voltage magnitudes and phase angles at various nodes in the grid. This example will guide you through writing MATLAB code to execute the PQ method algorithm. We will begin by outlining the fundamental principles of the PQ method, including its iterative approach for solving nonlinear power balance equations. Key implementation details will cover MATLAB functions for building admittance matrices, handling node data structures, and setting convergence criteria. The discussion will proceed with a step-by-step breakdown of the code, highlighting critical segments such as the Newton-Raphson iterative solver, mismatch calculations for active and reactive power, and Jacobian matrix updates. We will also explain data input formats for bus parameters, line impedances, and load/generation specifications. Finally, complete MATLAB code along with sample demonstration data will be provided. This will enable you to thoroughly understand the implementation process and adapt it to your own power flow analysis projects, incorporating features like tolerance checks and visualization of convergence trends.