Atificial neural network application for control of STATCOM in power systems for both voltage control mode and reactive power mode

2009 ◽  
Author(s):  
S. Sumathi ◽  
Bansilal
Keyword(s):  
Neural Network ◽  
Power Systems ◽  
Reactive Power ◽  
Voltage Control ◽  
Control Mode ◽  
Power Mode ◽  
Network Application ◽  
Voltage Control Mode

scholarly journals Voltage and reactive power optimisation of offshore wind farms based on terminal voltage control mode of DFIG

2017 ◽  
Vol 2017 (13) ◽  
pp. 874-879 ◽  
Author(s):  
Cuihua Tian ◽  
Xuanyao Luo ◽  
Jianpeng Dong ◽  
Baichao Chen ◽  
Jiaxin Yuan
Keyword(s):  
Reactive Power ◽  
Voltage Control ◽  
Wind Farms ◽  
Offshore Wind ◽  
Control Mode ◽  
Offshore Wind Farms ◽  
Terminal Voltage ◽  
Voltage Control Mode

scholarly journals Voltage Control and Braking System of a DFIG during a Fault

2021 ◽  
Vol 16 (1) ◽  
pp. 121-131
Author(s):  
Rabin Mahat ◽  
Khagendra B. Thapa ◽  
Sudip Lamichhane ◽  
Sudip Thapaliya ◽  
Sagar Dhakal
Keyword(s):  
Wind Turbine ◽  
Reactive Power ◽  
Voltage Control ◽  
Simulation Software ◽  
Control Mode ◽  
Grid Voltage ◽  
Braking System ◽  
Control Scheme ◽  
Grid Side ◽  
Voltage Control Mode

This paper describes a voltage control scheme of a doubly fed induction generator (DFIG) wind turbine that can inject more reactive power to the grid during a fault so as to support the grid voltage. To achieve this, the coordinated control scheme using both rotor side converter (RSC) and grid side converters (GSC) controllers of the DFIG are employed simultaneously. The RSC and GSC controllers employ PI controller to operate smoothly. In the voltage control mode, the RSC and GSC are operated. During a fault, both RSC and GSC are used simultaneously to supply the reactive power into the grid (main line) depending on voltage dip condition to support the grid voltage. The proposed system is implemented for single DFIG wind turbine using MATLAB simulation software. The results illustrate that the control strategy injects the reactive power to support the voltage stability during a fault rapidly. Also, the braking system is designed to protect the wind turbine system from over speed. For this purpose, the braking resistors are being used.

Direct Current-Controlled Distribution Static Synchronous Compensator for Voltage Quality Improvement

2013 ◽  
Vol 648 ◽  
pp. 361-364
Author(s):  
Lei Huang ◽  
Deng Xiang Yang ◽  
Jie Tang ◽  
Qun Feng Zhu
Keyword(s):  
Quality Improvement ◽  
Direct Current ◽  
Reactive Power ◽  
Voltage Control ◽  
Current Control ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Sag ◽  
Voltage Quality ◽  
Voltage Control Mode

This paper presents a direct current-controlled static reactive power compensator (DSTATCOM) for voltage quality improvement of low-medium distribution network. The main circuit of the DSTATCOM uses VSI-SPWM structure-based voltage source inverter (VSI), and both operation of reference current and control of compensation current are realized in synchronous reference frames. The function of DSTATCOM to mitigate voltage sag and flicker, two common voltage quality problems, is discussed in detail in this paper. According to the forming way of reactive reference current, operation mode of DSTACOM are classified into current control mode and voltage control mode. And under the two operation modes the function of DSTATCOM to mitigate voltage sag and flicker under different control modes is simulated with MATLAB. The simulation results show that the current control mode is suitable for mitigating voltage flicker, while the voltage control mode for voltage sag.

RTDS-Based Simulate Analysis of AC Filters Switch Method in HVDC Converter for Voltage Stability

2013 ◽  
Vol 756-759 ◽  
pp. 4250-4253
Author(s):  
Xiao Jun Zhu ◽  
Tao Chen ◽  
Wei Fang ◽  
Luo Jiang Qian ◽  
Yi Yu Wen
Keyword(s):  
Voltage Stability ◽  
Power Transmission ◽  
Voltage Control ◽  
Salient Feature ◽  
Fast Response ◽  
Control Mode ◽  
Reactive Control ◽  
Voltage Level ◽  
Action Sequence ◽  
Voltage Control Mode

In most of the AC-DC hybrid power transmission system AC filters is widely applied to stabilize voltage level in addition to filter harmonic. However, the voltage stability of AC bus is greatly influenced by action sequence of switching AC filters in group. The paper presents the concept of reactive characteristics of the convertor and AC filters, using reactive and voltage control mode to switch them. The modeling, control, and principle of operation for the AC-side switching filters are described. The voltage level is controlled via regulating action of switching filters by step. The salient feature of the proposed control modes is that voltage control contributes to keep the voltage level, and reactive control has no fast response on guaranteeing voltage stability, but two methods can apply to different occasions based on the requirements of voltage stability. All analysis and control system designs are verified through building a RTDS model in a typical ±500kV power system.

scholarly journals Modified Voltage Control Law for Low Frequency Railway Power Systems

2017 ◽  
Author(s):  
John Laury ◽  
Lars Abrahamsson ◽  
Math Bollen
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Low Frequency ◽  
Voltage Control ◽  
Load Sharing ◽  
Alternative Methods ◽  
Control Law ◽  
Public Power ◽  
Negative Impacts ◽  
Railway Power Systems

In today’s Swedish and Norwegian low frequency railway power system the voltage at a converter is controlled such that its voltage will drop with increased reactive power output. However, for low frequency railways the influence of active power on voltage is larger compared to public power systems and alternative methods are interesting to investigate. This paper presents a modified voltage control law for increased load sharing between converter stations and reduce the risk for converter overload in low frequency railways power systems. The modified voltage control law is derived mathematically and tested with different droops for two case studies. The results confirms the increased load sharing between the converter stations. The results are analysed and discussed; ideas are presented to counteract some of the negative impacts of the modified voltage control law.

A Method of Automatic Voltage Optimization Control Based on Real Time Digital Simulation

2013 ◽  
Vol 336-338 ◽  
pp. 653-658
Author(s):  
Yu De Yang ◽  
Yu Sheng Qiu
Keyword(s):  
Power Systems ◽  
Real Time ◽  
Reactive Power ◽  
Digital Simulation ◽  
Voltage Control ◽  
Test Method ◽  
Control Effectiveness ◽  
Advantages And Disadvantages ◽  
The Status ◽  
Optimal Control Scheme

With the development of smart grid, regional grid automatic voltage control (AVC) system has been widely used in power systems, but the effect is uneven, and there are not relating tools to evaluate its performance. The paper proposes a Closed-loop test method combining Real Time Digital Simulation system (RTDS) with reactive optimization procedures to simulate and optimization the status of actual grid. An optimal control scheme of the actual grid from the new method can be used to judge the advantages and disadvantages of actual AVC system. Simulation tests show online RTDS-based power system reactive power and voltage control simulation is good. It can be regard as reference to evaluate the control effectiveness of the actual AVC system.

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