Voltage Stability Study | Electric Power System | Equations

One of the most important issues innetwork security analysis is voltage stability analysis.

Harmonics and voltage stability analysis in power …

The proposed indicator alsoshows a good performance in detecting the margin to the voltage stability limit, with bothsimulation and real PMU data.

These effects include two main aspects: voltagestability and active line flow.

Power System Voltage Stability and Control A ..

...(e.g. Static Var Compensators or SVCs and Shunt Static Synchronous Compensator or STATCOMs), to a great extent, generators are responsible for maintaining adequate voltage profiles across the systems =-=[1]-=-. Consequently, their characteristics and their limitations are of major importance for the analysis of power grids, particularly when the system is operated near its limits. This is even more relevan...

In this dissertation, someselected topics of voltage stability analysis are covered.

This paper investigates the effects of Static Var Compensator (SVC) onvoltage stability of a power system. The functional structure for SVC builtwith a Thyristor Controlled Reactor (TCR) and its model are described. The modelis based on representing the controller as variable impedance that changes withthe firing angle of the TCR. A Power System Computer Aided Design/Electromagnetic Transients including DC (is used to carry out simulations of the system under study and detailed resultsare shown to access the performance of SVC on the voltage stability of thesystem.

Power System Voltage Stability and Control A …

Presently power system operates under a high stress level which was neglected at the moment they were designed. The operating conditions of power system is being threatened form the reliability, controllability and security point of view. HVDC transmission brings a solution to have secure and improve the stability margins of power system. The characteristic like independent control of real and reactive power improves the power system stability and ensures an efficient power transfer. This thesis presents the control strategy used for VSC-HVDC transmission to improve the transient and voltage stability of power system. Transient instability caused by a system faults overcome due to the fast power run back capability of the VSC-HVDC transmission. VSC-HVDC prevents the system from transient instability by its instant power reversal ability. The voltage support capability of VSC system helps to protect the system from voltage collapse, hence losing of synchronism can be avoided. A grid connected back to back VSC-HVDC modeled in MATLAB/ Simulink environment and a current mode control strategy was implemented. The simulation was done to have an observation of a faster and independent control of real and reactive power.

Improvement of voltage stability in power system …

With the increasing complexity of the world’s power transmission networks, it is becoming more and more difficult to analyse and maintain power system stability. This report looks at how four voltage stability analysis methods, namely, the Voltage Change Index (VCI), the Voltage Collapse Proximity Indicator (VCPI), Continuation Power Flow (CPF) and the New Voltage Stability Index (NVSI), can be used in conjunction with synchrophasor measurements to analyse voltage stability and detect voltage collapse.

The voltage stability problem has become a growing ..

With the advent of Phasor Measurement Unit (PMU) or Synchrophasor technology, real time monitoring of voltage stability of power system is now a reality.