Abstract
This paper deals with the voltage regulation in a weak system which contains large inductive loads and wind turbines using Doubly Fed Induction Generators (FDIGs). The DFIGs demand large amounts of reactive power from the grid and as a result, there is a voltage drop in the system which may be extra deteriorated if large inductive loads and motors are also present in the same line.  The problem of the voltage regulation in these cases is treated with the installation of a Static Var Compensator (SVC) besides the capability of the DFIGs to partially regulate the voltage themselves. In this paper, new modeling procedures based on optimal control are developed for the design of the SVC controller and a novel strategy for the grid side converter of the DFIG is presented. The nonlinear system is simulated in the SIMULINK software so that the performance of the new controllers is validated. 
Highlights
The increased need for wind energy development makes the installation of wind turbines in ‘weak’ ac grids necessary
The distributed generation with wind power stations installed in weak distribution systems may enlarge this problem especially when large inductive loads are connected to the same line
This paper deals with the design of the necessary control loops so that good performance of the grid voltage can be attained in a very weak system which contains a wind park (WP) and large inductive loads
Summary
The increased need for wind energy development makes the installation of wind turbines in ‘weak’ ac grids necessary. The grid voltage decreases significantly during the start of the asynchronous motors in which the reactive power exchange between the grid and the WP changes direction This change in the direction of the reactive power stresses the various electronic components of the system especially those of the wind turbines. The real power from the WP oscillates and does not increase This means that this wind turbine cannot be connected to the line. The improved performance of the voltage permits two more wind turbines to be connected to the line which means that higher penetration of wind energy can be accomplished in weak systems if good voltage regulation is achieved
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