A Novel Fuzzy Based Control Scheme for Power Quality Enhancement in Grid Connected System

2014 ◽  
Vol 573 ◽  
pp. 304-309
Author(s):  
M. Muhaidheen ◽  
S. Muralidharan
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Consumer Products ◽  
Point Of View ◽  
Modern World ◽  
Simple Method ◽  
Control Scheme

Today’s modern world, all the frequently using electrical appliances ranging from consumer products to state of the art industrial products exhibits nonlinearity. Due to this the quality of the Grid becomes worse. It also pollutes, electrical point of view, the other healthy systems also. In this connection, various approaches have been put forth to minimize the harmonics in the supply which in turn improve the quality of the power Grid in terms of improving real, reactive power flow and power factor. This paper proposes the novel approach to enhance the power quality in the grid by using simple method to extract the harmonic current compared to time consuming d-q modelling approach. This novel control techniques exhibit excellent dynamic performance, easy to implement, high robustness and stability. The proposed control scheme is verified by comparing its performance with its counterparts. In this connection a testing scheme is developed and tested with the help of MATLAB/SIMULINK package and it agrees in line with our proposed scheme.

SPV-Based UPQC with Modified Power Angle Control Scheme for the Enhancement of Power Quality

2019 ◽  
Vol 29 (04) ◽  
pp. 2050064 ◽  
Author(s):  
A. Gowrishankar ◽  
M. Ramasamy
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Digital Simulation ◽  
Energy System ◽  
Active Power ◽  
Solar Irradiation ◽  
Prototype Model ◽  
Synchronous Reference Frame ◽  
Control Scheme

Unified Power Quality Conditioner (UPQC) with a modified Power Angle Control (PAC) scheme is presented for effective interconnection of renewable energy system into the grid. The UPQC consists of both shunt and series Active Power Filters (APFs). The shunt and series APF is one of the most effective custom power devices, which provides compensation for current and voltage-based disturbances, respectively. The shunt APF supplies active power to the load from the Distributed Generation (DG) in addition to reactive power demand supplied by it. Because of this functionality, the Volt–Ampere (VA) burden increases along with the rating of the shunt inverter. The PAC scheme aims to effective utilization of series and shunt APFs through sharing of reactive power to reduce VA burden on shunt APF. The PAC scheme is based on Synchronous Reference Frame (SRF) theory, which has simple computations, is robust and uses existing measurements of Solar Photovoltaic (SPV)-integrated UPQC. The performance of the proposed SPV-integrated UPQC is verified with the manifestation of nonlinear loads and reactive burdens with the SPV power generating system. The dynamic performance of the PV-UPQC is verified under the grid disturbances such as voltage sag, swell, varying load and change in solar irradiation. The effectiveness of the proposed control scheme is evaluated through the digital simulation and hardware experimental prototype model.

scholarly journals Instantaneous Reactive Power Theory Control Scheme for Reactive Power Compensation using DSTATCOM

2020 ◽  
Vol 8 (6) ◽  
pp. 1181-1186
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Power Flow ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Power Theory ◽  
Instantaneous Reactive Power Theory ◽  
Reactive Power Flow ◽  
Control Scheme ◽  
Static Compensator

Distribution static compensator is a well known facts device which control reactive power flow in a distribution system. Nowadays major loads in distribution system are inductive loads, which will consume more reactive power. In order to improve power quality, this paper developed an IRPT control scheme for generating the reference quantity components for DSTATCOM to compensate that reactive power. DSTATCOM simulation is done in MATLAB using IRPT

Research on the Reliability of Box for Gear Test Bed

2011 ◽  
Vol 121-126 ◽  
pp. 1744-1748
Author(s):  
Xiang Yang Jin ◽  
Tie Feng Zhang ◽  
Li Li Zhao ◽  
He Teng Wang ◽  
Xiang Yi Guan
Keyword(s):  
Power Flow ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Test Bed ◽  
Kinematics Simulation ◽  
Beveloid Gears ◽  
Overall Performance

To determine the efficiency, load-bearing capacity and fatigue life of beveloid gears with intersecting axes, we design a mechanical gear test bed with closed power flow. To test the quality of its structure and predict its overall performance, we establish a three-dimensional solid model for various components based on the design parameters and adopt the technology of virtual prototyping simulation to conduct kinematics simulation on it. Then observe and verify the interactive kinematic situation of each component. Moreover, the finite element method is also utilized to carry out structural mechanics and dynamics analysis on some key components. The results indicate that the test bed can achieve the desired functionality, and the static and dynamic performance of some key components can also satisfy us.

Uticaj solarne elektrane na kvalitet električne energije u niskonaponskoj distributivnoj mreži

2020 ◽  
Vol 22 (1-2) ◽  
pp. 137-144
Author(s):  
Hidajet Salkić ◽  
Amir Softić ◽  
Amer Salkić
Keyword(s):  
Power Quality ◽  
Negative Feedback ◽  
Electricity Market ◽  
Reactive Power ◽  
Electric Power System ◽  
Integrated System ◽  
Distributed Source ◽  
Voltage Quality ◽  
Number Of Customers

The electric power system, as an integrated system for transmission, distribution and consumption of electricity, is one of the most complex technical and economic systems today. Customers affect on the voltage quality of power network, but the network also has an impact on customers. All disturbances in the network can disrupt operation of the network and affect on operation of the customers, as well as reduce the level of efficiency and operation life or even seriously damage network. Number of customers is increasing every day, as well as proportion of customers who generate disturbances in the network and, at the same time, are sensitive to them. These circumstances impose the need for frequent monitoring of the network, so the analysis of power quality is not unjustified cost but extremely important and profitable investment. The quality of electricity, as part of the overall quality supply of electricity customers in deregulated conditions of liberal electricity market becomes significant regulatory parameter for network operators and a significant contracting parameter on the electricity market. Network operators are obliged to establish a system of individual measurements and a system of permanent monitoring of power quality parameters to determine the state and improve the parameters to the standardized level. Technical parameters are determined by the recommendations made at the international level and may, but do not need, be legally binding. Maintaining a certain level of voltage quality at some point of the network is the responsibility of electricity distributor. This task distributor executes by limiting of negative effects of producer/customer to the network. Therefore, each electricity producer/customer is obliged to reduce own negative feedback effects (injection of higher harmonics, taking of reactive power, emissions of flickers and loads unbalances) to a prescribed, prearranged, limited values. There are many norms that describe the quality of electricity, but in Europe the best known is EN50160 (issued by CENLEC). This paper presents the approach to measuring the voltage quality at the point of electricity delivery from distributed source into distribution network from the aspect of limiting the negative feedback of distributed source on the voltage quality.

scholarly journals Design and Simulation of a Unified Power Quality Conditioner by Fuzzy Logic for Egyptian Power Grid Connected to Zafarana Egypt Wind System

2019 ◽  
Vol 4 (9) ◽  
pp. 1-8
Author(s):  
Montaser Abd El Sattar ◽  
Adel A. Elbaset ◽  
Ali H. KasemAlaboudy ◽  
Wessam Arafa Hafez
Keyword(s):  
Wind Energy ◽  
Power Quality ◽  
Reactive Power ◽  
Power Grid ◽  
Energy System ◽  
Wind System ◽  
Unified Power Quality Conditioner ◽  
Wind Energy System ◽  
Power Quality Conditioner

Wind energy system is lately receiving a lot of attention, because they are cost inexpensive, environmental safe and clean renewable energy source, as compared with nuclear and fossil fuel power generation. The operational characteristics of wind electric turbines has considerable dissatisfaction and stress on the quality of electric power system. Harmonics, variations of voltage and reactive power are most of power quality issues for grid connected with wind turbine. This paper introduces a design and simulation of unified power quality conditioner using a fuzzy controller to improve the power quality for Egyptian power grid connected to Zafarana Egypt wind system. The proposed performance of the unified power quality conditioner system is verified by simulating the model using MATLAB/SIMULINK environment. The simulation results showed that the proposed unified power quality conditioner provide efficient cancellation of both load current  harmonics  and supply voltage sag in addition to compensation of reactive power, and thus making the electrical grid connected wind energy system more efficient by improving the quality of power.

scholarly journals Research on Transient Power Quality of Large-capacity Electric Arc Furnace

2021 ◽  
Author(s):  
Liu Yang ◽  
Qinyue Tan ◽  
Di Xiong ◽  
Zhengguang Liu
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Short Circuit ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Normal Operation ◽  
Arc Furnace ◽  
Three Phase ◽  
Transient Power Quality

The overrun of transient power quality index caused by the large-capacity electric arc furnace (EAF) has become a prominent problem affecting the safe and stable operation of the power system. (1) In this paper, the relationship between arc furnace volt-age and current is derived based on the different stages of arc combustion, and the random variation of chaotic phenomenon of the arc voltage are simulated. Established an EAF model suitable for the study of transient power quality problems. (2) Take 50t AC EAF as an example to analyze the reactive power impact and the influence on the point of common coupling (PCC) voltage caused by the three-phase short circuit of the electrode. The results show that the experimental results are consistent with the theoretical analysis, verifying the correctness and effectiveness of the model. (3) When the three-phase short-circuit occurs, the reactive power impact is nearly 6 times that of normal operation, the short-circuit current is 2.66 times that of normal operation, and the effective value of the PCC voltage has dropped by 40.37%, which provides a theoretical basis for real-time compensation of impulsive reactive power and improvement of the transient power quality of the EAF.

scholarly journals A Four-Winding Inductive Filtering Transformer to Enhance Power Quality in a High-Voltage Distribution Network Supplying Nonlinear Loads

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2021 ◽  
Author(s):  
Yuehui Chen ◽  
Zhao Huang ◽  
Zhenfeng Duan ◽  
Pengwu Fu ◽  
Guandong Zhou ◽  
...  
Keyword(s):  
Power Quality ◽  
High Voltage ◽  
Reactive Power ◽  
Low Voltage ◽  
Distribution Network ◽  
Nonlinear Loads ◽  
The Public ◽  
Passive Filters ◽  
Grid Side

This paper solves the problem of reactive power and harmonics compensation in a high-voltage (HV) distribution network supplying nonlinear loads. An inductive filtering (IF) approach where passive filters connect to the filtering winding of a four-winding inductive filtering transformer (FW-IFT) is presented to enhance the power quality of the public grid. This method can not only greatly suppress harmonic currents of the medium and/or low-voltage (LV) side, but also prevent them from flowing into the public grid. The new main circuit topology, where the FW-IFT has specific filtering winding by adopting the ampere-turn balance of the transformer, is presented. On the basis of the structure of the FW-IFT, the magnetic potential balanced equation and inductive filtering technology, its equivalent circuit and mathematical model are established, and the filtering performances are analyzed in detail. Simulation and experimental results rated at SN-10/0.38 of the FW-IFT are presented to prove the efficacy of the comprehensive enhancement of power quality on the grid side.

scholarly journals Modeling and Control of a Novel Hybrid Power Quality Compensation System for 25-kV Electrified Railway

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3303 ◽  
Author(s):  
Minwu Chen ◽  
Yinyu Chen ◽  
Mingchi Wei
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Compensation System ◽  
Modeling And Control ◽  
Voltage Unbalance ◽  
Hybrid Power ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
And Control

The severe power quality problems aroused by the single-phase 25-kV traction power supply system (TPSS), especially for the voltage unbalance (VU) and high-frequency harmonic resonance, have attracted increasing attention nowadays. In this paper, a novel hybrid power quality compensation system, including a power flow controller (PFC) and thyristor-controlled L and C-type filter (TCL-CTF), is proposed. The PFC can be used for VU compensation, and the TCL-CTF can be designed to filter out harmonics as well as compensate reactive power. Furthermore, an optimized compensation strategy is proposed, and the power quality of the TPSS can meet the requirements of the technology standard. Compared with the conventional scheme, the compensation capacity of the PFC can be reduced by 12%, as well as the cost. Finally, the effectiveness of the proposed system is verified by the simulation and experimental results.

Research and Application of SVC Technology in Grid

2014 ◽  
Vol 543-547 ◽  
pp. 878-883
Author(s):  
Jun Dong ◽  
Jian Guo Xu ◽  
Hao Zhang ◽  
Yu Jie Pei ◽  
Xian Feng Li
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Distribution System ◽  
Power Flow ◽  
Reactive Power ◽  
Control Strategies ◽  
Load Capacity ◽  
Flow Distribution ◽  
Nonlinear Load ◽  
The Impact

The cause serious deterioration in power quality problems for the growing impact and nonlinear load capacity, introduced SVC device in the role of modern power systems and applications. According to the lack of adequate regional dynamic reactive power regulation means to cause voltage fluctuations, harmonics exceeded the actual situation, through analysis and simulation of the existing 66kV grid power quality conditions, refers to the necessity of application of SVC, the compensation capacity for SVC, filter capacitor system parameters and control strategies were designed, the results show improved 220kV SVC reactive power flow distribution system, reducing the system once or twice a net loss, reducing the impact and harmonic interference voltage caused by nonlinear loads, system security, economic operation of great significance.

Harmonic Reduction in Grid Connected Wind Energy System with Dynamic Voltage Restorer Using Fuzzy Logic Technique

2014 ◽  
Vol 626 ◽  
pp. 197-201
Author(s):  
B. Ashok Kumar ◽  
N. Kamaraj ◽  
C.K. Subasri
Keyword(s):  
Fuzzy Logic ◽  
Wind Energy ◽  
Power Quality ◽  
Reactive Power ◽  
Energy System ◽  
Conventional Technique ◽  
Superior Performance ◽  
Power Electronic ◽  
Fuzzy Logic Technique

Grid connected Wind energy conversion system uses power Electronic converters hardly in fixed speed systems except for reactive power compensation. This Power Electronic converter causes major electrical losses and affects power quality of the system. The quality of the voltage and current is also affected by sensitive loads which are used widely in most of Automated Industries and Research laboratories. Disturbances in waveforms occurs which results in harmonics. To improve such power quality problem of the system DVR which is based on fuzzy logic technique is introduced. The system is tested for conventional technique and also with fuzzy logic. The performance is investigated through MATLAB/SIMULINK software. The simulation results confirm the superior performance of the proposed DVR based fuzzy logic technique than conventional technique. The proposed system reduces harmonics as well as mitigates voltage sag/swell.

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