Analyze The Role of Inductors on Power flow between Power Electronic Devices and Electric Grid

Power Flow control is very important procedure when renewable sources are connected to electric grid. Furthermore, Most common topologies of grid tied distributed generation have inductor attached to power converters. In this article, the role of inductors linking between power converters and electric grid is analyzed. Values of these inductors can affect largely the value of Power flow (Active and Reactive power) in both sides, while phase angle between voltage of terminals determines the direction of power flow. This paper proposes MATLAB/SIMULINK models to study this impact, for different operation conditions (four quadrants I-V curves). Two methods of coils calculation are applied, in order to design the best value calculated in the proposed MATLAB/SIMULINK models.

Developing Algorithm and Program for Power Flow Analysis in Power System with VSC-HVDC

with different frequency make Voltage Source Converter - HVDC link (VSC-HVDC links) an attractive technology for most power transport in meshed grids. Advantages are the high controllability of active and reactive power at the converter’s terminals and the ability to increase the stability of the surrounding AC system. VSC-HVDC can provide active and reactive control to achieve maximum power transfer, system stability and improve power quality and reliability. This research aims to develop a mathematical model and an algorithm for the analysis of power flow in a steady state of power system containing VSC-HVDC.The Jacobian matrix inNewton- Raphsonalgorithm, which is the relationship between voltage and power mismatches, is extended with the VSC HVDC variablesto control active and reactive powers and voltage magnitude in any combination. A Newton-Raphson load flow program has been developed which includes comprehensive control facilities and exhibits very strong convergence characteristics. Two scenarios have been studied, back-to-back VSC-HVDC link and full VSC-HVDC link connecting two buses in AC networks. The algorithm and the program have been verified through a number of simulation examples carried out on IEEE 14-bus System.

Developing Algorithm for Power Flow Analysis in Power System with UPFC aiming to Enhancing Voltage Profile and Loss Reduction

Unified Power Flow Controller (UPFC) plays a vital role in improving the power system performance, both the static and dynamic, and enhanced the system loading capability by rerouting the power flow in the network. This paper presents control and performance of UPFC intendedfor installation on the transmission line to control power flow and improve voltage profile.