scholarly journals Static Voltage Stability Analysis of Power System Using the Combination of P-V Curve and the Modal Analysis

2015 ◽  
Author(s):  
Wang-Qing Mao ◽  
Qi Yang ◽  
Ming-Yu Yang ◽  
Shuang Zhang ◽  
Feng Gao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Modal Analysis ◽  
Voltage Stability ◽  
Static Voltage Stability

scholarly journals Static analysis of voltage stability with DFIG

2016 ◽  
Vol 19 (3) ◽  
pp. 5-12
Author(s):  
Binh Thi Thanh Phan ◽  
Thao Thi Thu Huynh ◽  
Au Ngoc Nguyen
Keyword(s):  
Stability Analysis ◽  
Modal Analysis ◽  
Static Analysis ◽  
Power Flow ◽  
Voltage Stability ◽  
Jacobian Matrix ◽  
Wind Generation ◽  
Power Network ◽  
Power Flow Calculation ◽  
Static Voltage Stability

The static voltage stability analysis is carried out by V-Q sensitivity or Q-V modal analysis. These analyses are based on the Jacobian matrix of power flow calculation. This is regarded as load bus stability analysis. With DFIG of PQ mode, the wind generation bus is considered as the PQ bus. Due to the limits of converters, these PQ buses became very special and this influences on the voltage stability examining. This paper also examines the penetration level and the location of wind generation injection based on voltage stability. The reliability of the algorithm is illustrated in a study of 14 buses power network.

scholarly journals Static Voltage Stability Assessment of the Kenyan Power Network

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Ombuki Mogaka ◽  
Roy Orenge ◽  
Julius Ndirangu
Keyword(s):  
Sensitivity Analysis ◽  
Stability Analysis ◽  
Modal Analysis ◽  
Voltage Stability ◽  
Reactive Power ◽  
Power Network ◽  
Static Voltage Stability ◽  
Load Demand ◽  
Rate Of Increase ◽  
Conventional Methods

In recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to economic, environmental, and geographical constraints. This has led to the system being prone to instability since it is being operated under stressed conditions. In the recent past, several studies have been carried out on voltage stability analysis and improvement using various conventional methods. However, conventional methods have various limitations in their utilization for voltage stability analysis. One solution to overcome these limitations is to employ a combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. In this paper, a methodology is proposed involving the combination of QV modal analysis, sensitivity analysis (VQ) and power-voltage curves in assessing the static voltage stability analysis taking a case study of the Kenyan Power Network. V-Q sensitivity analysis and QV modal analysis have been used to identify the load regions most susceptible to voltage instability and the corresponding weak buses in the network for various V-Q responses. Reactive power loss sensitivities for branches in the network have been used to determine the critical (weak) lines in the network. Loading margins (LM) and voltage stability margins (VSM) have then been used to determine the proximity to voltage collapse of the voltage weak buses identified by QV modal analysis. The effect of tripping one the critical lines on the voltage weak buses is also investigated. The current high voltage power network under the average peak loading conditions during the year 2019 is considered for the study. The paper also reviews existing voltage stability analysis methods and their limitations.

scholarly journals OPTIMAL PLACEMENT OF FLEXIBLE ALTERNATING CURRENT TRANSMISSION SYSTEM (FACTS) DEVICES FOR STATIC VOLTAGE STABILITY ENHANCEMENT

2014 ◽  
pp. 12-15
Author(s):  
ANJU GUPTA ◽  
P. R. SHARMA
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Voltage Stability ◽  
Stability Margin ◽  
Transmission System ◽  
System Stability ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Static Voltage Stability ◽  
Facts Devices

This Voltage stability problems increasing day by day because of demand increase. It is very important to analyze the power system with respect to voltage stability. Location of FACTS devices is important for the enhancement of voltage stability. This paper investigates the voltage stability analysis of 14 bus systems by optimally locating Flexible AC Transmission System (FACTS) devices. Shunt and series FACTS controllers are introduced in the weakest bus and its effectiveness is assessed by comparing voltage profile and loading margins enhancement. It is shown that best location for static voltage stability margin is the “weakest bus” of the system. Continuation power flow (CPF) is done with PSAT (power system stability analysis Toolbox).

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