Power-flow study

About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.

Small signal stability analysis: experiences, achievements, and challenges

Abstract: This paper presents an overview on the recent trend of small-signal stability analysis of power systems, focusing mainly on the experience, applications and achievements, and the challenges facing the power industry in this area. Issues discussed include experiences and lessons learnt from real-life incidents, modelling and study requirements, analysis tools available and their performances, and the possible future developments. The paper shows the importance of addressing small signal stability of power systems in all stages of planning and operation, as well as the viability of analysing and mitigating these problems with the advanced tools available to the industry today.

Application of HSA and GA in optimal placement of FACTS devices considering voltage stability and losses

Abstract: Voltage collapse is instability of heavily loaded electric power systems that cause to declining voltages and blackout. Power systems are predicated to become more heavily loaded in the future decade as the demand for electric power rises while economic and environmental concerns limit the construction of new transmission and generation capacity. Heavily loaded power systems are closer to their stability limits and voltage collapse blackouts will occur if suitable monitoring and control measures are not taken. To control transmission lines, it can be used from FACTS devices. In this paper Harmony search algorithm (HSA) and Genetic Algorithm (GA) have applied to determine optimal location of FACTS devices in a power system to improve power system stability. Three types of FACTS devices (TCPAT, UPFS, and SVC) have been introduced. Bus under voltage has been solved by controlling reactive power of shunt compensator. Also a combined series-shunt compensators has been also used to control transmission power flow and bus voltage simultaneously. Different scenarios have been considered. First TCPAT, UPFS, and SVC are placed solely in transmission lines and indices have been calculated. Then two types of above controller try to improve parameters randomly. The last scenario tries to make better voltage stability index and losses by implementation of three types controller simultaneously. These scenarios are executed on typical 34-bus test system and yields efficiency in improvement of voltage profile and reduction of power losses; it also may permit an increase in power transfer capacity, maximum loading, and voltage stability margin.

Subsychronous Resonance Zones in the IEEE "Bench Mark" Power System

Abstract: Studies of subsynchronous resonance (SSR) phenomena are conducted in a power system composed of a turbo-generator set connected to an infinite bus via series capacitor-compensated transmission lines. The analysis is applied to a "bench mark" model proposed by the special IEEE Power Engineering Society Task Force on Subsynchronous Resonance.

On design of a robust load frequency controller for interconnected power systems

Abstract: A novel design of a robust decentralized load frequency controller (LFC) is proposed for an inter-connected three-area power system, for the purpose of regulating area control error (ACE) in the presence of uncertainties in system dynamics and external disturbances. The design is based on the concept of active disturbance rejection control (ADRC). Estimating and mitigating the total effect of various uncertainties in real time, ADRC is particularly effective against a wide range of parameter variations, model uncertainties, and large disturbances. Furthermore, with only two tuning parameters, the controller provides a simple, easy-to-use solution to complex engineering problems in practice. Here, an ADRC-based LFC solution is developed for the power systems with turbines of various types, such as non-reheat, reheat, and hydraulic. The simulation results verified the effectiveness of the ADRC.