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This paper presents new methodologies for modeling static VAr compensators (SVCs) in the power flow problem. The proposed formulations utilize sigmoid functions to model the control equations that describe the steady-state behavior of SVCs. The first methodology introduces reactive power injection as a new state variable, while the second methodology utilizes the thyristor firing angle. These steady-state SVC methodologies were applied to the power flow problem using the full Newton formulation, which incorporates the control equations into the system of nonlinear equations. One of the main contributions of these proposed methodologies is that they eliminate the need for alternating adjustments concerning the operational limits of the SVC during the iterative power flow process. The implementation of a power flow program was tested on both small-scale tutorial systems and the medium-scale IEEE Nordic system. The presented results validate and demonstrate the effectiveness of the proposed methodology. [ABSTRACT FROM AUTHOR]

The optimal wind power generation connection in power systems is a growing field of study recently. Accordingly to the literature, the Optimal Transmission Switching technique and the Power Transfer Distribution Factors have been applied to the optimization problem of the capacity of wind power connection. This paper proposes a new methodology for maximization of wind power connection that integrates these two methods mentioned. The optimization process is based on the linearized power flow and chooses the best line for a firm wind farm connection from a list of possible candidates. The proposed algorithm is evaluated considering the 11-Bus tutorial system, the IEEE New England and IEEE-118 systems. • New methodology for determining optimal connection of wind farms to power systems. • Link Optimal Transmission Switching and Power Transfer Distribution Factor methods. • Transmission Switching applied only to connection lines reduces computational effort. • New Power Transfer Distribution Factor provides real power unbalancing distribution. [ABSTRACT FROM AUTHOR]

• A new methodology for the Steady-state security region for the security assessment of distribution systems with the presence of DER. • Consideration of the intermittent characteristic of the DER generations. • The proposed methodology can be used in online or offline environments. • The proposed tool can be used in planning studies of distribution systems. • The proposed methodology can also be used for DER Regulation and Allocation in Distribution Networks: Volt/Var optimization and Congestion Relief. Modern Electric Power Systems are evolving from a centralized generation model toward a complex infrastructure with the presence of Distributed Energy Resources (DER). The transformative changes are especially pronounced at the level of the distribution system. The emergence of new generation technologies as solar, for example, affects the customer profile, expansion planning, and operation procedures of distribution utilities. Therefore, this paper describes a new methodology based on steady-state security regions concept for the security assessment of distribution systems with the presence of DER. The main objective of the proposed methodology is to allow an effective evaluation of the operating conditions of distribution systems with high penetration of DER, focusing on the intermittence of the new generation resources. The proposed methodology has been tested using two distribution systems. The first one is a tutorial 13-bus system, which is a small tutorial feeder, and the second one is a real large-scale model of a distribution network. The results presented indicate the effectiveness of the proposed technique in the distribution system security analysis. The proposed methodology is implemented using the Python language and uses the OpenDSS software as a power flow solver. [ABSTRACT FROM AUTHOR]