scholarly journals Modelling and Load Test Analysis of a Wind farm for 14 Bus System

2021 ◽  
pp. 279-284
Author(s):  
Abirami K ◽  
Dr. P. Maruthupandi
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Short Circuit ◽  
Load Condition ◽  
Synchronous Generator ◽  
Test System ◽  
Load Test ◽  
Test Analysis ◽  
Wind Generator ◽  
Bus System

This paper describes about the reliable and secure operation of a power system network is an indispensable concern for the system operator. The modelling of wind farm and load test analysis is used to identify the real and reactive power by using DIgSILENT power factory simulation software.By developing the 5MW Wind farm modelling by using Permanent Magnet Synchronous Generator (PMSG).The main aim is to analyze the performance of wind farm modelling with load Test System and also to detect the fault occurrence by using the condition of short circuit studies in the system. In IEEE 14 bus system it is used to identify the wind generator is in overload condition and the wind generator is in lower load condition.

Dynamic Modeling and Simulation of Doubly-Fed VSCF Wind Generator Based on PSCAD/EMTDC

2012 ◽  
Vol 608-609 ◽  
pp. 748-754
Author(s):  
Kang Yi Li ◽  
Chao Lu ◽  
Xiao Zhen Zhang ◽  
Miao Yu
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Reactive Power ◽  
Low Voltage ◽  
Short Circuit ◽  
Implementation Process ◽  
Maximum Point ◽  
Wind Generator ◽  
Farm Model ◽  
Doubly Fed

In order to build an aggregated wind farm model to research on the effect large scale wind power has on the transient performance of the power system, firstly, it is necessary to build an effective WTGs model. Based on the electro-magnetic transient simulation platform PSCAD/EMTDC, this paper built models of all the parts of Doubly-fed type VSCF wind generator, including wind model, wind turbine model, rotation system model, detailed converters model, and emphatically expounded the implementation process of the control strategy based on the stator flux vector oriented principle. Then through the change of wind speed and setting three-phase short-circuit fault on the net side, the model is verified on the decoupling control of active and reactive power for maximum point power tracking (MPPT) and the ability of low voltage ride-through.

scholarly journals Improved Control Strategy of MMC–HVDC to Improve Frequency Support of AC System

2020 ◽  
Vol 10 (20) ◽  
pp. 7282
Author(s):  
Zicong Zhang ◽  
Junghun Lee ◽  
Gilsoo Jang
Keyword(s):  
Wind Turbines ◽  
Wind Farm ◽  
Control Method ◽  
Short Circuit ◽  
Synchronous Generator ◽  
Frequency Stability ◽  
Offshore Wind ◽  
Inertial Response ◽  
Control Evaluation ◽  
The Impact

With the continuous development of power electronics technology, variable-speed offshore wind turbines that penetrated the grid system caused the problem of inertia reduction. This study investigates the frequency stability of synchronous, offshore wind-farm integration through a modular-multilevel-converter high-voltage direct-current (MMC–HVDC) transmission system. When full-scale converter wind turbines (type 4) penetrate the AC grid, the AC system debilitates, and it becomes difficult to maintain the AC system frequency stability. In this paper, we present an improved inertial-response-control method to solve this problem. The mathematical model of the synchronous generator is based on the swing equation and is theoretically derived by establishing a MMC–HVDC. Based on the above model, the inertia constant is analyzed using a model that integrates the MMC–HVDC and offshore synchronous generator. With the new improved control method, a more sensitive and accurate inertia index can be obtained using the formula related to the effective short-circuit ratio of the AC system. Moreover, it is advantageous to provide a more accurate inertial control evaluation for AC systems under various conditions. Furthermore, the impact of the MMC–HVDC on system safety is assessed based on the capacitor time constant. This simulation was implemented using the PSCAD/EMTDC platform.

scholarly journals Grid-connected Response Verification of AC Microgrid under Single Line-to-ground Short Circuit

2019 ◽  
pp. 1-10
Author(s):  
Maruf A. Aminu
Keyword(s):  
Power Systems ◽  
Reactive Power ◽  
Short Circuit ◽  
Synchronous Generator ◽  
Dynamic Responses ◽  
Single Line ◽  
Physical Systems ◽  
Short Circuits ◽  
Power System Performance ◽  
Grid Interconnection

In design of power systems, assumptions are made to model the physical systems. The assumptions may not sufficiently reflect the behavior of the system under normal and faulted conditions. Under short circuit conditions, system parameters vary significantly, particularly in microgrids with grid interconnection capabilities. This paper presents the result of validating the response of a microgrid which is capable of grid interconnection and islanding under voltage and reactive power control regimes. The microgrid is modeled to incorporate two wind turbines, each rated 5.5 kW, 400 V. The utility has synchronous generator rated 100 MW, 13.8 kV. Both the utility and microgrid are capable of exchanging active power and reactive power. Single line-to-ground short circuits are introduced and withdrawn at 30.00 s and 32.00 s, respectively. The dynamic responses of the testbed are captured pre-, during- and post-short circuit in grid-connected mode under both control regimes. The response of the testbed is verified to be consistent with established short circuit theory, verifying the validity of the system for short circuit detection and analysis. The testbed can therefore be used for short circuit and related studies, design optimization and power system performance prediction.

Contribution of Variable-Speed Wind Turbines to Voltage Control

2002 ◽  
Vol 26 (6) ◽  
pp. 347-358 ◽  
Author(s):  
Pablo Ledesma ◽  
Julio Usaola
Keyword(s):  
Wind Turbines ◽  
Wind Farm ◽  
Reactive Power ◽  
Voltage Control ◽  
Synchronous Generator ◽  
Induction Generator ◽  
Base Case ◽  
Variable Speed ◽  
Control Techniques ◽  
Control Schemes

Variable speed, grid connected, wind turbines open new possibilities for voltage control, because they use electronic converters, which may regulate the reactive power interchange with the grid. This paper proposes two voltage control schemes for variable speed wind turbines with double-fed induction generator. The first scheme acts on the wind-turbine power factor, while the latter acts directly on the converter current. Advantages and drawbacks of both techniques are discussed. Both control techniques have been tested by simulations of a base case, which represent a synchronous generator, a wind farm and a local load, and several disturbances such as the loss of compensator capacitors.

scholarly journals Effect of Wind Farm and Thyristor Switched Series Capacitors on a Faulty Network

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Milad Gheydi ◽  
Sajad Bagheri
Keyword(s):  
Genetic Algorithm ◽  
Wind Farm ◽  
Reactive Power ◽  
Short Circuit ◽  
Power Grid ◽  
Active Power ◽  
Second Step ◽  
Voltage Profile ◽  
Switched Capacitors ◽  
Active And Reactive Power

Controlling voltage and active or reactive losses are one of the most important issues in each power grid. In this paper, the influence of wind farm and thyristors switched capacitors on the network are considered. TSSC and Wind turbines are one of the significant components of each network. These instruments are also one of the resources of producing active and reactive power. In this study, wind farm and TSSC are already located optimally by Genetic algorithm. This network studied when a fault considered in one of buses. So that, in first step none of wind farm and TSSC are in the power grid. In the second step, both wind farm and TSSC are connected while a short circuit accrues in one of the busses or lines of the network.  At the end, it will be observed that using thyristor switched capacitors and wind farm influence the network. So that, the capacity of producing the reactive and active power will be increased and totally the loss of the system will be decreased. Furthermore, the voltage profile will be in a suitable range.

scholarly journals Contribution of FACTS Devices to the Transient Stability Improvement of a Power System Integrated with a PMSG-based Wind Turbine

2019 ◽  
Vol 9 (6) ◽  
pp. 4893-4900 ◽  
Author(s):  
N. E. Akpeke ◽  
C. M. Muriithi ◽  
C. Mwaniki
Keyword(s):  
Power System ◽  
Wind Turbine ◽  
Energy Demand ◽  
Wind Farm ◽  
Transient Stability ◽  
Transient State ◽  
Synchronous Generator ◽  
Test System ◽  
Synchronous Generators ◽  
Facts Devices

The increasing penetration of wind energy to the conventional power system due to the rapid growth of energy demand has led to the consideration of different wind turbine generator technologies. In fault conditions, the frequency of the power system decreases and eventually leads to speed differences between the grid and the interconnected wind generator. This can result to power system problems such as transient instability (TS). This paper focuses on enhancing the TS of a permanent magnet synchronous generator (PMSG)-based power system during 3ph fault conditions using FACTS devices. The power system considered is connected to a large wind farm which is based on PMSG. Critical clearing time (CCT) is used as an index to evaluate the transient state of the system. Under the study of an IEEE-14 bus system using PSAT as a simulation tool, the integrated CCT with PMSG-based wind turbine is improved with three independent FACTS devices. One of the synchronous generators in the test system has been replaced at random with the PMSG-based wind turbine which is meant to generate an equivalent power. Time domain simulations (TDSs) were carried out considering four study cases. Simulation results show that the (CCT) of the system with the FACTS devices is longer than the CCT without them, which is an indication of TS improvement.

Stability Improvement in Power Systems Using Unified Power Flow Controller (UPFC)

2013 ◽  
Vol 768 ◽  
pp. 392-397 ◽  
Author(s):  
B. Gopinath ◽  
S. Suresh Kumar ◽  
Juvan Michael
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Short Circuit ◽  
Electric Energy ◽  
System Response ◽  
Unified Power Flow Controller ◽  
Flow Controller ◽  
Ac Transmission ◽  
Power Flow Controller ◽  
Bus System

Flexible AC transmission system (FACTS) is a system composed of static equipments used for ac transmission of electric energy to improve the power transfer capability and to enhance controllability of interconnected network. Unified Power Flow Controller (UPFC) is the most widely used FACTS device for providing fast acting reactive power compensation on high voltage electricity transmission network. This paper deals with the designing of Adaptive Neuro Fuzzy Inference controller (ANFIC) and fuzzy based Particle Swarm Optimization (PSO) controller for the performance analysis of UPFC. The controller have been designed and tested for controlling the real and reactive power of UPFC. Fuzzy-PI controller is used to control the shunt part of UPFC. The system response under high short circuit level is tested on 5-bus system and 118-bus system. Computer simulation by MATLAB/SIMULINK has been used to verify proposed control strategies.

scholarly journals Active and Reactive Power Scheduling Optimization using Firefly Algorithm to Improve Voltage Stability under Load Demand Variation

2018 ◽  
Vol 9 (2) ◽  
pp. 365 ◽  
Author(s):  
Mohamad Khairuzzaman Mohamad Zamani ◽  
Ismail Musirin ◽  
Halim Hassan ◽  
Sharifah Azwa Shaaya ◽  
Shahril Irwan Sulaiman ◽  
...  
Keyword(s):  
Voltage Stability ◽  
Firefly Algorithm ◽  
Reactive Power ◽  
Test System ◽  
Scheduling Optimization ◽  
Wind Generator ◽  
Power Scheduling ◽  
Load Demand ◽  
Active And Reactive Power ◽  
Demand Variation

This paper presents active and reactive power scheduling using firefly algorithm (FA) to improve voltage stability under load demand variation. The study involves the development of firefly optimization engine for power scheduling process involving the active and reactive power for wind generator. The scheduling optimization of wind generator is tested by using IEEE 30-Bus Reliability Test System (RTS). Voltage stability of the system is assessed based in a pre-developed voltage stability indicator termed as fast voltage stability index (FVSI). This study also considers the effects on the loss and voltage profile of the system resulted from the optimization, where the FVSI value at the observed line, minimum voltage of the system and loss were monitored during the load increment. Results obtained from the study are convincing in addressing the scheduling of power in wind generator. Implementation of FA approach to solve power scheduling revealed its flexibility and feasible for solving larger system within different objective functions.<span style="font-size: 9pt; font-family: Arial, sans-serif;" lang="EN-US">This paper presents active and reactive power scheduling using firefly algorithm (FA) to improve voltage stability under load demand variation. The study involves the development of firefly optimization engine for power scheduling process involving the active and reactive power for wind generator. The scheduling optimization of wind generator is tested by using IEEE 30-Bus Reliability Test System (RTS). Voltage stability of the system is assessed based in a pre-developed voltage stability indicator termed as fast voltage stability index (FVSI). This study also considers the effects on the loss and voltage profile of the system resulted from the optimization, where the FVSI value at the observed line, minimum voltage of the system and loss were monitored during the load increment. Results obtained from the study are convincing in addressing the scheduling of power in wind generator. Implementation of FA approach to solve power scheduling revealed its flexibility and feasible for solving larger system within different objective functions.</span>

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