scholarly journals Modeling and Analysis of High Power Synchronous Generator

2021 ◽  
Vol 10 (2) ◽  
pp. 18-23
Author(s):  
Aziza Benaboud
Keyword(s):  
Power Factor ◽  
Control Method ◽  
Frequency Control ◽  
Synchronous Generator ◽  
Unity Power Factor ◽  
Modeling And Analysis ◽  
Electrical Grid ◽  
Voltage Quality ◽  
Operating Points ◽  
Power Electronic Converter

This paper proposes a mathematical model of synchronous generator used as an interface between power plant energy sources and the electrical grid. Power electronic converter is then needed to adapt their synchronous speed to the network frequency. Control method is proposed in order to optimize the power factor of synchronous machine. In addition, author presents the performance evaluation of the proposed strategy which allows to improve machine current and voltage quality. Simulation results for different operating points and transitions between them highlight the capabilities of the proposed control model. These include the ability to operate with unity power factor.

Unity Power Factor Control of a Direct-Driven Permanent Magnet Synchronous Wind-Power Generator Based on Three-Level Converter

2011 ◽  
Vol 347-353 ◽  
pp. 2227-2230 ◽  
Author(s):  
Shu Xi Liu ◽  
Shan Li ◽  
Juan He
Keyword(s):  
Permanent Magnet ◽  
Power Factor ◽  
Synchronous Generator ◽  
Level System ◽  
Unity Power Factor ◽  
Power Generator ◽  
Energy Capture ◽  
Wind Power Generator ◽  
Level Converter ◽  
Power Factor Control

Direct-driven permanent magnet synchronous generator (PMSG) has become an important research subject besides the double-fed induction generator. With the increasing of unit capacity, the study of topology of high power converters based on multi-level converter is attracting more and more attention. The study of vector control of the direct-driven permanent magnet synchronous wind turbines based on three-level converter is carried out in this paper. Based on the maximum wind-energy capture control of the PMSG, the unity power factor operation of PMSG is realized by controlling the d-axis current to zero in the generator-side converter. A detailed comparative study of two-level system and three-level system is conducted. The simulation results verify the validity of this algorithm.

scholarly journals Optimal Power Reserve of a Wind Turbine System Participating in Primary Frequency Control

2018 ◽  
Vol 8 (11) ◽  
pp. 2022 ◽  
Author(s):  
Abdullah Bubshait ◽  
Marcelo G. Simões
Keyword(s):  
Wind Turbine ◽  
Pitch Angle ◽  
Control Method ◽  
Frequency Control ◽  
Synchronous Generator ◽  
Rotor Speed ◽  
Wind Turbine System ◽  
Primary Frequency ◽  
Primary Frequency Control ◽  
And Control

Participation of a wind turbine (WT) in primary frequency control (PFC) requires reserving some active power. The reserved power can be used to support the grid frequency. To maintain the required amount of reserve power, the WT is de-loaded to operate under its maximum power. The objective of this article is to design a control method for a WT system to maintain the reserved power of the WT, by controlling both pitch angle and rotor speed simultaneously in order to optimize the operation of the WT system. The pitch angle is obtained such that the stator current of the permanent magnet synchronous generator (PMSG) is reduced. Therefore, the resistive losses in the machine and the conduction losses of the converter are minimized. To avoid an excessive number of pitch motor operations, the wind forecast is implemented in order to predict consistent pitch angle valid for longer timeframe. Then, the selected pitch angle and the known curtailed power are used to find the optimal rotor speed by applying a nonlinear equation solver. To validate the proposed de-loading approach and control method, a detailed WT system is modeled in Matlab/Simulink (The Mathworks, Natick, MA, USA, 2017). Then, the proposed control scheme is validated using hardware-in-the-loop and real time simulation built in Opal-RT (10.4.14, Opal-RT Inc., Montreal, PQ, Canada).

Modeling and Analysis of the Dynamic Response of an Off-Grid Synchronous Generator Driven Micro Hydro Power System

2021 ◽  
Vol 10 (2) ◽  
pp. 373-384
Author(s):  
Waqas Ali ◽  
Haroon Farooq ◽  
Akhtar Rasool ◽  
Intisar Ali Sajjad ◽  
Cui Zhenhua ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Power System ◽  
Power Factor ◽  
Synchronous Generator ◽  
Operating Conditions ◽  
System Stability ◽  
Hydro Power ◽  
Modeling And Analysis ◽  
Full Load ◽  
Generator Voltage

This paper models and analyses the dynamic response of a synchronous generator driven off-grid micro hydro power system using Simulink tool of MATLAB software. The results are assessed from various perspectives including regulation through no load to full load and overload scenarios under normal and abnormal operating conditions. The investigation under the normal conditions of no load, linearly changing load and full load divulges that the system operates in a satisfactory manner as generator voltage and frequency remain approximately constant at 1 pu. However, at full load generator voltage and frequency drop 3% and 0.5% respectively from its nominal values but remain within prescribed standard IEC limits. The results also expose that the abnormal conditions produced by abrupt changes in load, system faults and severe overload, cause the unwonted variations in the magnitude of generator parameters. Moreover, the study reveals that the system stability significantly enhances when the system is run at full load because the regulation time to fix the variations in the generator parameters; except input mechanical power; decreases, e.g. from 4.1 sec to 0.8 sec for generator voltage, with the increase in the loading from quarter to full load respectively at unity power factor. Further, it is also observed that the regulation time rises, e.g. from 0.8 sec to 1.3 sec for generator voltage, with the reduction in load power factor from unity to 0.8, respectively. Thus, proper protection, to cater for increased fault current at full load and power factor correction must be provided to improve the system stability and protection. Furthermore, it is also concluded that the over loading in any case should be strongly avoided in this type of system and it should never be allowed to exceed 20% of the full load value to avoid system failure 

Modeling and Analysis of the Dynamic Response of an Off-Grid Synchronous Generator Driven Micro Hydro Power System

2021 ◽  
Vol 10 (2) ◽  
pp. 373-384
Author(s):  
Waqas Ali ◽  
Haroon Farooq ◽  
Akhtar Rasool ◽  
Intisar Ali Sajjad ◽  
Cui Zhenhua ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Power System ◽  
Power Factor ◽  
Synchronous Generator ◽  
Operating Conditions ◽  
System Stability ◽  
Hydro Power ◽  
Modeling And Analysis ◽  
Full Load ◽  
Generator Voltage

This paper models and analyses the dynamic response of a synchronous generator driven off-grid micro hydro power system using Simulink tool of MATLAB software. The results are assessed from various perspectives including regulation through no load to full load and overload scenarios under normal and abnormal operating conditions. The investigation under the normal conditions of no load, linearly changing load and full load divulges that the system operates in a satisfactory manner as generator voltage and frequency remain approximately constant at 1 pu. However, at full load generator voltage and frequency drop 3% and 0.5% respectively from its nominal values but remain within prescribed standard IEC limits. The results also expose that the abnormal conditions produced by abrupt changes in load, system faults and severe overload, cause the unwonted variations in the magnitude of generator parameters. Moreover, the study reveals that the system stability significantly enhances when the system is run at full load because the regulation time to fix the variations in the generator parameters; except input mechanical power; decreases, e.g. from 4.1 sec to 0.8 sec for generator voltage, with the increase in the loading from quarter to full load respectively at unity power factor. Further, it is also observed that the regulation time rises, e.g. from 0.8 sec to 1.3 sec for generator voltage, with the reduction in load power factor from unity to 0.8, respectively. Thus, proper protection, to cater for increased fault current at full load and power factor correction must be provided to improve the system stability and protection. Furthermore, it is also concluded that the over loading in any case should be strongly avoided in this type of system and it should never be allowed to exceed 20% of the full load value to avoid system failure 

Concurrent unity power factor and constant mutual flux control for PMSG-WT MPPT

2020 ◽  
pp. 0309524X2096887
Author(s):  
Nadia A Elsonbaty ◽  
Mohamed A Enany ◽  
Mahmoud Elymany
Keyword(s):  
Power Factor ◽  
Synchronous Generator ◽  
Control Technique ◽  
Constant Current ◽  
Unity Power Factor ◽  
Point Tracking ◽  
Simulation Testing ◽  
Energy Transducer ◽  
Power Point ◽  
Stator Flux

In this paper, a new concurrent unity power factor and constant stator flux linkage (UPF-CFL) control is presented. The main goal of this technique is to introduce the Permanent Magnet Synchronous Generator (PMSG) as an optimal wind energy transducer. The handled generator load angle and back EMF control achieve the optimum requirements for wind applications namely Maximum Power Point Tracking (MPPT). To do this, both UPF and CFL are integrated into one control methodology to obtain the advantages of each one. While the first well utilizes the apparent power increasing the generator side converter capability, the second protects the generator against magnetic saturation to enable higher speed operation. Mathematical model based on constant current fed equivalent circuit is presented taking the constraints of each individual control algorithm into account. The concurrent performance characteristics are presented and compared with each of concurrent separated algorithm characteristics for assessments. The control technique is implemented and finally, simulation testing is provided for evaluation.

scholarly journals Control Method for Three-Phase Grid-Connected Inverter PV System Employing Unity Power Factor (UPF) Strategy in Microgrid

2019 ◽  
Vol 115 ◽  
pp. 01006
Author(s):  
Amirreza Naderipour ◽  
Zulkurnain Abdul-Malek ◽  
Vigna K. Ramachandaramurthy ◽  
Josep. M. Guerrero
Keyword(s):  
Power Factor ◽  
Control Method ◽  
Unity Power Factor ◽  
Pv System ◽  
Distributed Power Generation ◽  
Dispersed Generation ◽  
Three Phase ◽  
Control Scheme ◽  
Grid Connected Inverter ◽  
Power Generation Systems

Microgrids (MGs) are developing owing to the rapidly growing distributed power generation systems. The MG controls the flexibility of the network to ensure the requirements of reliability and power quality are satisfied. A typical MG normally consists of dispersed generation resources, which are connected by power electronic inverters, storages, and non-linear loads. This study deals with a compensation control method of a photovoltaic grid-connected inverter using unity power factor (UPF) strategy in MG. In this case, the proposed control method can provide output currents without distortion and with the UPF. Further, it is able to increase the inverter output current to approximately 19 times of the value obtained conventionally. The proposed control method can be applied to three-phase grid interfaced converters such as DG inverters and can also be easily integrated into the conventional control scheme without installation of extra hardware. A theoretical analysis is presented and the performance of the proposed control method for a grid-connected inverter in a MG is evaluated through simulation results.

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