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 Online Static Voltage Stability Monitoring for Power Systems Using PMU Data

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jianhong Pan ◽  
Aidi Dong ◽  
Jiashu Fan ◽  
Yang Li
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Voltage Stability ◽  
Jacobian Matrix ◽  
Singular Values ◽  
Test System ◽  
Measurement Unit ◽  
Monitoring Method ◽  
Static Voltage Stability ◽  
Stability Monitoring

A new online static voltage stability monitoring method for power systems is proposed by using phasor measurement unit (PMU) data in this paper. This approach uses the real-time power, voltage, and phase angle data collected by the PMU to estimate the power flow Jacobian matrix of the system, and then the static voltage stability is monitored via the minimum singular values (MSVs) of the power flow Jacobian matrix. The novelty of the approach lies in the fact that it only utilizes PMU data for implementing online monitoring of the power system static voltage stability, independent of the physical model and its parameters. The application results on the IEEE 57-bus test system verify the effectiveness of the proposed approach.

scholarly journals Improvement of bus voltage profiles of Nigerian power network in the presence of Static Synchronous Compensator (STATCOM) and Doubly Fed Induction Generator (DFIG)

2020 ◽  
Vol 39 (1) ◽  
pp. 228-237
Author(s):  
I.B. Anichebe ◽  
A.O. Ekwue
Keyword(s):  
Renewable Energy ◽  
Stability Analysis ◽  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Load Flow ◽  
Energy Sources ◽  
Power Network

Frequent blackouts and unstable supply of electricity show that the  voltage instability problem has been one of the major challenges facing the power system network in Nigeria. This study investigates the voltage stability analysis of the Nigerian power network in the presence of renewable energy sources; FACTS device is used as a voltage controller. A 330kV, 28-bus power system network was studied using the PSS/E software-based Newton-Raphson load-flow technique. The results show that 10 out of the 28 buses had voltages lying below the statutory limit of 0.95 ≤ 1.05 p.u. The application of STATCOM and DFIG devices on two of the weakest buses restored the voltages to acceptable statutory limits. The total active and reactive power losses were reduced to 18.76% and 18.82% respectively. Keywords: Voltage stability analysis; Integration of renewable energy sources; FACTS controllers, Reactive Power, Power Flow.

A New Method to Solve Static Voltage Collapse Point with Hybrid Power Network Equations

2013 ◽  
Vol 732-733 ◽  
pp. 796-799
Author(s):  
Tao Yi ◽  
Jian Peng Li ◽  
Song Zhang ◽  
Ying Bin Zhang
Keyword(s):  
Power Flow ◽  
Jacobian Matrix ◽  
Voltage Collapse ◽  
Power Network ◽  
Analysis Model ◽  
Power Flow Calculation ◽  
Flow Equations ◽  
Node Voltage ◽  
Hybrid Equations ◽  
Extended Power

Electric power network components can be simulated with equivalent circuit and establish the hybrid node voltage and branch current electricity network analysis model based on it. We form the equations reflected the voltage collapse conditions, and establish the extended power flow equations with the hybrid equations, the static voltage collapse point can be calculated by solving them. The advantage of this method is that the power flow calculation can be convergence smoothly near the collapse point because of the extended power flow equations when the Jacobian matrix tends to be singular. The convergence can be achievable just because the joining of the equation reflecting the voltage collapse conditions has changed the structure of the Jacobian matrix. The simulation results show that this method is very effective.

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