scholarly journals Reactive Power Compensation of Modular Multilevel Cascaded Converter STATCOM using Average Power Inter-Cluster Control Method under Unbalanced Voltage Conditions

2020 ◽  
Author(s):  
Oghenewvogaga Oghorada ◽  
Huang Han ◽  
Ayodele Esan
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Average Power ◽  
Reactive Power Compensation ◽  
Cascaded Converter ◽  
Unbalanced Voltage

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.

Enhancement of PV Penetration with Centralized Control Method in Cimei Island Distribution System

2015 ◽  
Vol 799-800 ◽  
pp. 1272-1277
Author(s):  
Chia Hung Lin ◽  
Chao Shun Chen ◽  
Cheng Ting Hsu ◽  
Wei Lin Hsieh ◽  
Yih Der Lee ◽  
...  
Keyword(s):  
Line Segment ◽  
Distribution System ◽  
Load Transfer ◽  
Reactive Power ◽  
Control Method ◽  
Reactive Power Compensation ◽  
Control Algorithms ◽  
Centralized Control ◽  
Pv Systems ◽  
Pv Penetration

This paper discusses the use of centralized control method in an Intelligent Energy Management System (iEMS) to prevent voltage violation after load transfer between distribution feeders with high PV penetration level. The proposed method comprises three control modes with different control algorithms for regulating both reactive and active power output of PV inverters in a distribution system with multiple PV installations. Before the execution of load transfer, the total reactive power compensation required at the critical Point of Common Coupling (PCC) is solved by the reactance of distribution feeder line segment to prevent system voltage violation. With the proposed control algorithms, the iEMS dispatches total reactive power compensation among PV systems according to the reactance of line segment and issues the control command to each PV inverter for adjustment of PV power generation so that the ancillary service of voltage support can be provided by all PV systems in a fairer manner. A practical Cimei island distribution feeder pair is selected for computer simulation to verify the effectiveness of the proposed control method after load transfer between two feeders.

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

scholarly journals An Improved Droop Control Method for Voltage-Source Inverter Parallel Systems Considering Line Impedance Differences

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1158 ◽  
Author(s):  
Junjie Ma ◽  
Xudong Wang ◽  
Jinfeng Liu ◽  
Hanying Gao
Keyword(s):  
Traditional Method ◽  
Reactive Power ◽  
Control Method ◽  
Average Power ◽  
Parallel Systems ◽  
Power Sharing ◽  
Voltage Source ◽  
Droop Control ◽  
Voltage Reference ◽  
Voltage Compensation

In this paper, the effect of the line impedance difference between various inverters on power sharing with the traditional droop control method is fully analyzed. It reveals that the line impedance difference causes a significant reactive power error. An improved droop control method to eliminate the reactive power errors caused by the line impedance errors is proposed. In the proposed method, a voltage compensation determined by the actual reactive power error between the local inverter and the average one is added into the local voltage reference based on the CAN communication. Even when the communication is interrupted, the controller will operate with the last value of the average power, which still outperforms the traditional method. The effectiveness of the proposed control method is verified by simulation and experimental results, which show the proposed method possesses the better power sharing performance and dynamic response.

scholarly journals Converter Compensation of Reactive Power Consumed by the Induction Generato

2021 ◽  
Vol 57 (1) ◽  
pp. 64-79
Author(s):  
Jarosław Tępiński
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Power Grid ◽  
Reactive Power Compensation ◽  
Induction Generator ◽  
Power Electronic ◽  
Induction Generators ◽  
Hydropower Plants ◽  
Reactive Power Compensator ◽  
Power Electronic Converter

Purpose: The purpose of the article is to present a reactive power compensation for small hydropower plants with an induction generator. The classic compensation with capacitors is discussed and its improvement is proposed. Instead of capacitors, a three level power electronic converter connected in parallel to the induction generator can be used to provide reactive power compensation. The purpose of the paper is to present the developed structure of an active compensator and its control method. The developed control method was verified on a laboratory stand. The project and the methods: As part of research, an active compensator was built as a three-level power electronic converter in topology with Neutral Point Clamped. Laboratory tests of a converter compensator were carried out on a stand equipped with an induction generator with a power of 7.5 kW. Laboratory system measurements were made using a power analyzer and an oscilloscope. Results: A control structure of an active compensator based on a voltage-oriented method was presented and discussed. The operation of the con- verter compensator has been verified on a laboratory stand equipped with a 7.5 kW induction generator. The compensator current reduces the reactive (inductive) component of the current consumed from a power grid to a value equal to zero. The reactive power compensator ensures that the tgφ power factor is maintained at a set value of zero, which corresponds to the total compensation of inductive reactive power consumed by an induction generator working in a hydropower plant. Operation of the active compensator did not cause a significant increase in the harmonic content in the current consumed from the power grid. Conclusions: The paper presents the issues regarding reactive power compensation in hydropower plants with induction generators. Commonly used capacitor compensation has been covered and as a result, it is proposed to replace it with power electronics converter compensation of reactive power connected in parallel induction generators. Active compensator provides compensation for the entire reactive power consumed by the induction generator. The use of the converter compensator of reactive power significantly contributes to the reduction of costs for reactive power incurred by the owners of hydropower plants. The reactive power compensator also has a positive impact on the operation of the entire power grid, power losses from the reactive component of the current on the impedances of power grid components are limited. Keywords: renewable source of electricity, reactive power, active compensator, induction generator Type of article: original scientific article

The Coordination Control Method of Dynamic Reactive Power Compensation Equipment Based Multi-Objective

2013 ◽  
Vol 724-725 ◽  
pp. 635-640
Author(s):  
Ya Lu Sun ◽  
Wen Ying Liu ◽  
Ning Bo Wang ◽  
Yan Hong Ma
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Control Method ◽  
Coordinated Control ◽  
Reactive Power Compensation ◽  
Composite Indicator ◽  
Coordination Control ◽  
Slow Speed ◽  
Multi Objective ◽  
Reactive Compensation

According to the operation features that voltage of wind farm fluctuate greatly, we analyzed the operation features of reactive power compensation equipment and put forward the coordination control method of compensation equipment. The method solved the problem for a single for reactive compensation equipment caused by the slow speed and poor economy. Based on the target of safe and economical operation, we raised that using composite indicator calculate the capacity of all kinds of required compensation equipment, and then we had coordinated control to compensation equipments. This paper gave an example of Guazhou Gansu and tested and verified the feasibility and effectivity of the method.

Study on Matlab Simulation of Novel Distribution Static Synchronous Compensator

2015 ◽  
Vol 719-720 ◽  
pp. 486-489
Author(s):  
Li Chen
Keyword(s):  
Vector Control ◽  
Reactive Power ◽  
Control Method ◽  
Distribution Network ◽  
Reactive Power Compensation ◽  
Matlab Simulation ◽  
Transformation Theory ◽  
Static Synchronous Compensator ◽  
Novel Strategy ◽  
And Control

This paper analyses and researches the performance and principle of DSTATCOM in distribution network .Detecting means and control method of DSTATCOM are key point of this paper. The paper determines the detecting means of improved d-q transformation theory of vector control based on instantaneous reactive power and adopts a novel strategy based on the prediction table of double variable. Moreover, the simulation of DSTATCOM is presented with MATLAB. The simulating results prove the DSTATCOM put forward in the paper can realize dynamic reactive power compensation efficiently.

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.

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