This paper presents exhaustive review of various concept of voltage instability, main causes of voltage instability, classification of voltage stability, dynamic and static voltage stability analysis techniques, modeling, shortcomings, in power systems environments. It also reviews various current techniques/methods for analysis of voltage stability in power systems through all over world. This...

in this paper, we investigated the necessity and effects of optimal control methods in the stability and performance of a micro-grid that operates in islanded mode. the micro-gird is consisted of a combine heat and power (chp), a capacitor bank (cb), photovoltaic panel (pv) as power generation sources. in addition, battery and the building electricity and thermal load are placed on the load sid...

The increasing penetration of load model in distribution systems may significantly affect voltage stability of the systems, particularly during Low Voltage Ride-Through (LVRT) wind turbine. The main objective of this work is to present the impact of different static and dynamic load models, on the LVRT recovery after disturbances. A component and composite loading structures are considered, com...

This paper addresses a novel seven transistor (7T) CMOS SRAM cell design to enhance the stability, reduce dynamic power, leakage power and area in various applications. The designed cell has an inbuilt mechanism for charge sharing, by which power has been saved for write operation. The proposed 7T SRAM cell uses charging/ discharging single Bit Line (BL) mechanism, which results in reduction in...

This chapter introduces the concepts of voltage instability and the distinctions between voltage and angle instability. The driving force and main causes of voltage instability are analysed. Different methods and devices used to enhance voltage stability are also explained. The steady-state and dynamic modelling of the power system devices including wind generators and photovoltaic units have b...

Improving transient voltage stability is one of the most important issues that must be provided by doubly fed induction generator (DFIG)-based wind farms (WFs) according to the grid code requirement. This paper proposes adjusted DC-link chopper based passive voltage compensator and modified transient voltage controller (MTVC) based active voltage compensator for improving transient voltage stab...

voltage stability issues are growing challenges in many modern power systems. this paper proposes optimizing the size and location of static var compensator (svc) devices using a fuzzy weighted seeker optimization algorithm (fwsoa), as an effective solution to overcome such issues. although the primary purpose of svc is bus voltage regulation, it can also be useful for voltage stability enhance...

This paper proposes a methodology for mitigating the occurrence of cascading failure in stressed power systems. The methodology is essentially based on predicting voltage instability in the power system using a voltage stability index and then devising a corrective action in order to increase the voltage stability margin. The paper starts with a brief description of the cascading failure mechan...

Microgrids (MGs) have emerged throughout the world as major means of integrating a variety distributed energy resource (DER) technologies into distribution system. These DER are mostly coupled through electronic power converters (EPCs). This fact has created new operation challenges these converter-interfaced DERs could compromise MG stability, reliability, and resilience margins. On other hand...