The New Type of Reactive Power Compensation Device under Direct Current Control and Indirect Current Control

2013 ◽  
Vol 694-697 ◽  
pp. 826-829
Author(s):  
Yan Han ◽  
Xiaoming Zhang ◽  
Pan Pan Yang
Keyword(s):  
Direct Current ◽  
Reactive Power ◽  
Control Method ◽  
Reactive Power Compensation ◽  
Current Control ◽  
Instantaneous Reactive Power Theory ◽  
Direct Current Control ◽  
Indirect Current Control ◽  
The Difference ◽  
Compensation Device

This Paper Briefly Describes the Basic Principle of Reactive Power Compensation and Introduces the Indirect Current Control and Direct Current Control Method Based on Instantaneous Reactive Power Theory. Compare the Two Control Theory and Use the MATABLE Simulink Environment to Analyzing the Difference between the Two Methods

The Simulation of APF Based on Three-Phase VSI

2013 ◽  
Vol 397-400 ◽  
pp. 1901-1905
Author(s):  
Yu Feng Wang ◽  
Guang Ye Liu ◽  
Xiao Guo Lv ◽  
Zhong Chu Wang
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Structural Parameters ◽  
Current Control ◽  
Loop Control ◽  
Instantaneous Reactive Power Theory ◽  
Three Phase ◽  
Direct Current Control ◽  
And Control ◽  
Drive Signals

In order to restrain harmonic pollution of power grid, the structure and control strategy of APF was researched. The structural parameters and method of direct current control of the most widely used APF with three-phase VSI was discussed. Decoupling control of active and reactive current on the dq plane was realized by dq transforming. Harmonic of load current was detected by Ip-Iq algorithm based on the instantaneous reactive power theory. Double closed-loop control was applied and PWM drive signals of IGBT were got through comparison of triangle wave and modulation wave. The simulation results demonstrate that the kind of control method make APF good dynamic response and static compensation.

The Filtering Device under Improved Direct Current Control

2012 ◽  
Vol 588-589 ◽  
pp. 433-437 ◽  
Author(s):  
Ying Zhao ◽  
Jin Shan Ji ◽  
Nai Cheng Du
Keyword(s):  
Direct Current ◽  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Power Grid ◽  
Current Control ◽  
Filter Method ◽  
Elimination Method ◽  
Direct Current Control

This paper mainly describes the mechanism and elimination method of harmonic in low-voltage power grid. Improve direct current control method in the traditional filter method,filtering the harmonic and timely compensating reactive power in the grid. On this condition, it can make the power grid safe and stability. At the same time simulate the improved direct current control method, and the results verify the correctness and rationality of the control method.

The Application of S7-200 PLC Reactive Compensation Device in Small Substation

2012 ◽  
Vol 479-481 ◽  
pp. 1476-1480
Author(s):  
Qing He Chu ◽  
Wen Si Cao ◽  
Zhen Nie
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
High Reliability ◽  
Reactive Power Compensation ◽  
Control Device ◽  
Reactive Compensation ◽  
Reconstruction Project ◽  
Compensation Device ◽  
And Control

In the present rural power grid reconstruction project ,according to the problems of capacitor reactive power compensation in rural small substation. Take a small substation for instance, according to its operation and control method, set the criterion of the capacitor bank switching. A new high reliability, flexible reactive power compensation control device based on s7-200 PLC is designed. It plays an important role in improving the power supply , guaranteeing the quality of voltage, reducing the loss of rural power gid.

Research on Chain SVG Direct Current Control Simulation Based on PSCAD

2014 ◽  
Vol 644-650 ◽  
pp. 3866-3869
Author(s):  
Cun Guo Liu ◽  
Hui Hao ◽  
Zhi Qiang Zhang ◽  
Xin Hua Wang ◽  
Xiao Le Li ◽  
...  
Keyword(s):  
Direct Current ◽  
Reactive Power ◽  
Current Control ◽  
Simulation Software ◽  
Control Technology ◽  
Inductive Load ◽  
Fast Tracking ◽  
Reactive Compensation ◽  
Current Controller ◽  
Direct Current Control

SVG is a device parallel on the power grid for dynamic reactive power compensation, is a product of best performance and mature technology in the third generation dynamic reactive compensation technology so far. Thanks to power unit module series structure and PWM technology, compared with multiple SVG, chain SVG has high capacity, low loss, simple maintenance. But more complicated in control, indirect current control technology and direct current control technology are adopted. This paper utilizes PSCAD simulation software to build a chain SVG direct current controller model according to mathematical model of the chain SVG, simulates SVG compensation with inductive load and capacitive load, so as to verify advantages of fast tracking speed and stable control of direct current controller.

Study on the Direct Current Control Method Based on the d-q Transformation

2012 ◽  
Vol 588-589 ◽  
pp. 446-449
Author(s):  
Cong Mei Zha ◽  
Qi Ying Xu ◽  
Yong Sheng Zhu
Keyword(s):  
Simulation Model ◽  
Basic Principle ◽  
Direct Current ◽  
Control Method ◽  
Current Control ◽  
Direct Current Control ◽  
Static Var Generator ◽  
Simulation Results ◽  
And Control

Static var generator (SVG) basic principle and control method are introduced in the article, a direct current control method for SVG is put forward based on d-q transformation, this method is also analyzed from theory and made simulation model, the simulation results show that this control method is reasonable and effective.

The Design of Dynamic Reactive Power Compensation Device on Segmented Control Mode

2013 ◽  
Vol 321-324 ◽  
pp. 1333-1336
Author(s):  
Xiu He Lu ◽  
Chang Shuo Li ◽  
Qi Lin Li
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Perceptual Load ◽  
Control Method ◽  
Metallurgical Industry ◽  
Reactive Power Compensation ◽  
Control Mode ◽  
Loop Control ◽  
Distribution Station ◽  
Compensation Device

For metallurgical industry perceptual load fluctuations large, and distribution station bus power factor low, and power loss high problems, based on reactive power compensation principle of apparent power does not variable, and used SVC structure forms, has made sectional type compensation control mode, and based on power factor of closed-loop control method, has researched the dynamic reactive power compensation device, by the check of practical run, the feasibility has been proved of the control method, and it has a clear compensation effect and wide practical range and other outstanding features.

scholarly journals Reduced Switch Multilevel Inverter based STATCOM

2020 ◽  
Vol 6 (5) ◽  
pp. 117-121
Author(s):  
Akshay Kadu
Keyword(s):  
Direct Current ◽  
Power Factor ◽  
Control Method ◽  
Digital Simulation ◽  
Fast Response ◽  
Current Control ◽  
Multilevel Inverter ◽  
Control Technique ◽  
Basic Unit ◽  
Direct Current Control

This paper presents an application of reduced switch multilevel inverter topology to STACOM. This topology consists of basic unit in which two switches are connected in series and one H-bridge unit. Multilevel inverter is beneficial in terms of reliability and improved output quality. Multilevel inverter have only drawback of higher number of switches. This reduced switch topology has less number of switches as compared to conventional Cascaded H Bridge Inverter. Compared to direct control method, indirect control method is simple but due to fast response and precise control, direct current control method is quite effective. In this work STACOM is implemented to improve the Power factor of the power system. An extensive digital simulation of the recommended STATCOM and its controller is carried out using MATLAB/SIMULINK software to study system performance. Simulation results prove that using Direct current control technique overall power factor is improved.

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