A method to compute reactive power margins with respect to voltage collapse

1991 ◽  
Vol 6 (1) ◽  
pp. 145-156 ◽  
Author(s):  
T. Van Cutsem
Keyword(s):  
Reactive Power ◽  
Voltage Collapse

An ant colony optimization algorithm-based emergency control strategy for voltage collapse mitigation

2012 ◽  
Vol 3 (2) ◽  
pp. 147-156 ◽  
Author(s):  
R. A. El-Sehiemy ◽  
A. A. A. El Ela ◽  
A. M. M. Kinawy ◽  
M. T. Mouwafia
Keyword(s):  
Power Systems ◽  
Ant Colony Optimization ◽  
Power Flow ◽  
Reactive Power ◽  
Test System ◽  
Ant Colony ◽  
Voltage Collapse ◽  
Ant Colony Optimization Algorithm ◽  
Preventive Control ◽  
Control Actions

Abstract This paper presents optimal preventive control actions using ant colony optimization (ACO) algorithm to mitigate the occurrence of voltage collapse in stressed power systems. The proposed objective functions are: minimizing the transmission line losses as optimal reactive power dispatch (ORPD) problem, maximizing the preventive control actions by minimizing the voltage deviation of load buses with respect to the specified bus voltages and minimizing the reactive power generation at generation buses based on control variables under voltage collapse, control and dependent variable constraints using proposed sensitivity parameters of reactive power that dependent on a modification of Fast Decoupled Power Flow (FDPF) model. The proposed preventive actions are checked for different emergency conditions while all system constraints are kept within their permissible limits. The ACO algorithm has been applied to IEEE standard 30-bus test system. The results show the capability of the proposed ACO algorithm for preparing the maximal preventive control actions to remove different emergency effects.

scholarly journals Coordinated Optimal Control of Multiple Reactive Power Devices at Different Voltage Levels in UHVDC Near Zone

2020 ◽  
Vol 165 ◽  
pp. 06021
Author(s):  
Zongzu Yue ◽  
Xuhui Shen ◽  
Feng Yan
Keyword(s):  
Steady State ◽  
Power Output ◽  
Reactive Power ◽  
Power Grid ◽  
Coordinated Control ◽  
Central China ◽  
Voltage Collapse ◽  
Power Devices ◽  
Power Sources ◽  
Grid Voltage

Affected by different steady-state reactive power output ratios among generators, capacitors and other reactive devices in the end-to-end power grid, voltage collapse may occur due to the failure of the receiving-end AC system, and the problem of voltage stabilization in multi-DC feed systems is particularly common. For suppressing voltage collapse, sufficient dynamic reactive power support is an effective measure, and there are some differences in the dynamic support effect of different reactive power sources. The dynamic reactive power response of the generator and its reactive power margin are two important factors affecting the coordination and optimization of the reactive power of the generator. The comprehensive evaluation index is adopted to optimize the sequencing of the reactive power output of the generator near the DC drop point. A coordinated control method of dynamic and static reactive power for DC near-point systems at different voltage levels is proposed. By controlling the steady-state reactive power output ratio between multiple reactive devices, the node voltage is maintained near the target value, and reactive power control schemes at different voltage levels can be given to meet load changes. Finally, taking the actual situation of Central China Power Grid as an example, the results of different reactive voltage control strategies are compared and analyzed, which proves that the coordinated control strategy of multiple reactive power devices can significantly improve the stability of the receiving grid voltage.

scholarly journals DYNAMIC BIFURCATIONS IN A POWER SYSTEM MODEL EXHIBITING VOLTAGE COLLAPSE

1993 ◽  
Vol 03 (05) ◽  
pp. 1169-1176 ◽  
Author(s):  
E. H. ABED ◽  
H. O. WANG ◽  
J. C. ALEXANDER ◽  
A. M. A. HAMDAN ◽  
H.-C. LEE
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Period Doubling ◽  
System Model ◽  
Hopf Bifurcations ◽  
Voltage Collapse ◽  
Saddle Node ◽  
Dynamic Bifurcations ◽  
Period Doubling Bifurcations ◽  
Power System Model

Dynamic bifurcations, including Hopf and period-doubling bifurcations, are found to occur in a power system dynamic model recently employed in voltage collapse studies. The occurrence of dynamic bifurcations is ascertained in a region of state and parameter space linked with the onset of voltage collapse. The work focuses on a power system model studied by Dobson & Chiang [1989]. The presence of the dynamic bifurcations, and the resulting implications for dynamic behavior, necessitate a re-examination of the role of saddle node bifurcations in the voltage collapse phenomenon. The bifurcation analysis is performed using the reactive power demand at a load bus as the bifurcation parameter. It is determined that the power system model under consideration exhibits two Hopf bifurcations in the vicinity of the saddle node bifurcation. Between the Hopf bifurcations, i.e., in the "Hopf window," period-doubling bifurcations are found to occur. Simulations are given to illustrate the various types of dynamic behaviors associated with voltage collapse for the model. In particular, it is seen that an oscillatory transient may play a role in the collapse.

A Comparing Study on Voltage Support Ability between STATCOM and Generator

2014 ◽  
Vol 1077 ◽  
pp. 160-165
Author(s):  
Yin Guo Yang ◽  
Zhi Chang Yuan ◽  
Rui Chen ◽  
Jian Xi Lin ◽  
Wei Tan
Keyword(s):  
Reactive Power ◽  
Power Grid ◽  
Synchronous Generator ◽  
Voltage Collapse ◽  
Regional Power ◽  
Terminal Voltage ◽  
Digital Simulations ◽  
Voltage Support ◽  
Grid Based

STATCOM and synchronous generator are considered as measures of providing dynamic reactive power to power grid. Based on a real regional power grid, ability of voltage support between STATCOM and generator are compared through digital simulations. The results shows that STATCOM always provides additional reactive power to persist voltage collapse, while ability of generator reactive power are restricted by terminal voltage under faults.

scholarly journals STUDY OF VOLTAGE COLLAPSE CHARACTIRISTICS IN GRID CONNECTED WIND POWER PLANT

2011 ◽  
Vol 14 (2) ◽  
pp. 80-93
Author(s):  
Chuong Trong Trinh
Keyword(s):  
Power System ◽  
Wind Power ◽  
Power Plants ◽  
Wind Farm ◽  
Reactive Power ◽  
Evaluation Criteria ◽  
Voltage Collapse ◽  
Small Signal Stability ◽  
Energy Conversion Systems ◽  
The Impact

The scale of wind power plants is increasing continuously in Vietnam. The installed capacity of the largest wind farm is about 50MW by the end of this year. Therefore, power system planners will need to study their impact onthe power system in more detail. Wind energy conversion systems are very different in nature from conventional generators. Therefore dynamic studies must be addressed in order to integrate wind power into the power system. The impact of this wind power on voltage distribution levels has been addressed in the literatures. The majority of this work deals with the determination of the maximum active and reactive power that is possible to be connected on a system load bus, until the voltage at that bus reaches the voltage collapse point. This article introduces the methods of research standards, evaluation criteria of stable electricity supply; it identifies the centers of loads and focuses on the branch is "weak" in small signal stability to improve operational efficiency, reliability in electricity power supply.

scholarly journals Reactive Power Management System for Wind Power Plant

2019 ◽  
Vol 8 (2S11) ◽  
pp. 2204-2206
Keyword(s):  
Power Plant ◽  
Wind Power ◽  
Power Management ◽  
Management System ◽  
Reactive Power ◽  
Electric Power System ◽  
Rotating Magnetic Field ◽  
Wind Power Plant ◽  
Voltage Collapse ◽  
Power Management System

This paper deals with the study of reactive power management system for wind power plant. In the wind power plant, there is a need of reactive power for the process of developing rotating magnetic field in the induction generator. If the value of reactive power provided to the wind power plant is not sufficient than there occurs a voltage collapse in the electric power system and the occurrence of voltage collapse results in blackout. Therefore, this paper focus on the management of reactive power needs by the wind power plant in such a way that it could fulfil the requirement of power plant in a most efficient way without undergoing into voltage collapse.

Sign in / Sign up

Export Citation Format

Share Document