scholarly journals Terminal Synergetic Control for Direct Active and Reactive Powers in Asynchronous Generator-Based Dual-Rotor Wind Power Systems

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1880
Author(s):  
Habib Benbouhenni ◽  
Nicu Bizon
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Method Performance ◽  
Parameter Variations ◽  
Asynchronous Generator ◽  
Sliding Manifold ◽  
Synergetic Control ◽  
Wind Power Systems

A terminal synergetic control (TSC) is designed in this work for a rotor side converter (RSC) of asynchronous generator (ASG)-based dual-rotor wind power (DRWP) systems. The design is based on a novel sliding manifold and aims at improving the ASG performance while minimizing active and reactive power undulations. The method performance and its effectiveness were studied under harmonic distortion (THD) of current, parameter variations and power undulations. Simulation results, carried out using Matlab software, confirmed the system’s robustness against parameter variations and its effectiveness in power undulations. The performance of the designed technique was further compared to that of integral-proportional (PI) controllers in terms of parameter variations, power undulations and THD value of current. While both controllers were able to reduce the effects of power undulations and protect the rotor circuit against over-currents, the proposed TSC was shown to be more effective than the classical PI controller in tracking power and minimizing the undulations effect.

Operation Characteristics of Zone 3 Distance Protection in Wind Power Systems with Fixed-Speed Induction Generators

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
Shenghu Li
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Synchronous Generators ◽  
Induction Generators ◽  
Load Flow Analysis ◽  
Wind Power Systems ◽  
Operation Characteristics

The induction generators (IGs) are basic to wind energy conversion. They produce the active power and consume the reactive power, with the voltage characteristics fragile compared with that of the synchronous generators and doubly-fed IGs. In the stressed system states, they may intensify var imbalance, yielding undesirable operation of zone 3 impedance relays.In this paper, the operation characteristics of the zone 3 relays in the wind power systems is studied. With the theoretical and load flow analysis, it is proved that the equivalent impedance of the IGs lies in the 2nd quadrature, possibly seen as the backward faults by the mho relays, i.e. the apparent impedance enters into the protection region from the left side. The undesirable operation may be caused by more wind power, larger load, less var compensation, and larger torque angle.

A Novel Performance Enhancement Scheme for Doubly-Fed Induction Generator-Based Wind Power Systems under Voltage Sags and Swells

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Tapash Das ◽  
Jingxin Zhang ◽  
Hemanshu Pota
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Power Management ◽  
Reactive Power ◽  
Performance Enhancement ◽  
Protection System ◽  
Voltage Sags ◽  
Grid Voltage ◽  
Wind Power Systems ◽  
Doubly Fed

AbstractWind power is a major contributor in the renewable energy sector but it faces some issues regarding modern grid-code compliance. Popular wind power systems based on Doubly-Fed Induction Generators (DFIG) need additional protection under grid voltage disturbances. They also need to support the grid voltage under such transient occurrences. This paper presents a novel performance enhancement scheme for DFIGs subjected to symmetrical and asymmetrical voltage sags and swells at the Point of Common Coupling (PCC). The scheme comprises a protection system and a reactive power management system working simultaneously under the command of a supervisory control system. The protection system protects the DFIG converter by limiting the overcurrent in the Rotor Side Converter (RSC) of the DFIG and keeping the dc-link capacitor voltage within an acceptable range; whereas, the reactive power management supports the grid voltage by either injecting or absorbing reactive power to reduce the magnitude of voltage sags and swells. It is found that the performance of the DFIG wind generation system improves significantly under the proposed scheme. A grid-connected 9-MW DFIG wind farm is used for simulation in MATLAB/Simscape Power Systems.

A SVC Optimal Configuration Method in Wind Power Grid System

2013 ◽  
Vol 336-338 ◽  
pp. 712-717 ◽  
Author(s):  
Wen Xia Liu ◽  
Yong Yang ◽  
Cheng Hui Lin
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Power Flow ◽  
Large Scale ◽  
Wind Farm ◽  
Reactive Power ◽  
Monte Carlo Sampling ◽  
Compensation Point ◽  
Improved Genetic Algorithm ◽  
Wind Power Systems

With the background of large-scale wind power integration grid, in order to reduce wind farm voltage fluctuation and the grid loss, through the scenario analysis method, the objective function model was established to determine the best SVCs compensation capacity and compensation point. Firstly, the initial operation states of the wind power systems were obtained by the Monte Carlo sampling and power flow was calculated to get the reactive power compensation point and its capacity. Then the result of optimization model was calculated by the improved genetic algorithm. IEEE 30 system was taken as an example for the simulation calculation and the calculation results verify the validity of the model.

scholarly journals Variable-Gain Super-Twisting Sliding Mode Damping Control of Series-Compensated DFIG-Based Wind Power System for SSCI Mitigation

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 382
Author(s):  
Ronglin Ma ◽  
Yaozhen Han ◽  
Weigang Pan
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Feedback Linearization ◽  
Wind Farm ◽  
Reactive Power ◽  
Sliding Mode ◽  
System Stability ◽  
Point Tracking ◽  
Wind Power Systems

Subsynchronous oscillation, caused by the interaction between the rotor side converter (RSC) control of the doubly fed induction generator (DFIG) and series-compensated transmission line, is an alleged subsynchronous control interaction (SSCI). SSCI can cause DFIGs to go offline and crowbar circuit breakdown, and then deteriorate power system stability. This paper proposes a novel adaptive super-twisting sliding mode SSCI mitigation method for series-compensated DFIG-based wind power systems. Rotor currents were constrained to track the reference values which are determined by maximum power point tracking (MPPT) and reactive power demand. Super-twisting control laws were designed to generate RSC control signals. True adaptive and non-overestimated control gains were conceived with the aid of barrier function, without need of upper bound of uncertainty derivatives. Stability proof of the studied closed-loop power system was demonstrated in detail with the help of the Lyapunov method. Time-domain simulation for 100 MW aggregated DFIG wind farm was executed on MATLAB/Simulink platform. Some comparative simulation results with conventional PI control, partial feedback linearization control, and first-order sliding mode were also obtained, which verify the validity, robustness, and superiority of the proposed control strategy.

scholarly journals Numerically and Experimentally Verified Design of a Small Wind Turbine with Injection Molded Blade

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 776
Author(s):  
Byunghui Kim ◽  
Sang-June Park ◽  
Seokyoung Ahn ◽  
Myung-Gon Kim ◽  
Hyung-Gun Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Power Systems ◽  
Wind Turbine ◽  
Wind Power ◽  
Offshore Wind ◽  
Power Coefficient ◽  
Manufacturing Method ◽  
Small Wind Turbine ◽  
Verification Methods ◽  
Wind Power Systems

Although mega-watt class onshore and offshore wind power systems are used to generate power due to their cost-effectiveness, small wind power systems are important for household usages. Researchers have focused on aerodynamic characteristics as a conceptual design from their previous studies on Archimedes spiral wind turbines. Here, we verified the design of a small wind turbine AWM-750D (100 W capacity) via both numerical simulation and experimentation. We used commercial code ANSYS CFX for numerical simulation and compared turbulence models and surface roughness for determining the performance. To obtain reliable and robust blades, we analyzed the effective manufacturing method with Moldflow. Through a test with an open-suction type atmospheric boundary layer wind tunnel, we varied wind speed from 4.0 m/s to the rated value of 12.5 m/s and obtained 106 W, equivalent to a power coefficient of 0.205. In addition, we compared the numerical and experimental power vs. rotational speed and found the former is 6.5% lower than the latter. In this study, we proved that numerical simulations can act as design verification methods to predict wind turbine performances and reliable manufacturing. Through our research, we provided the prototype of a small wind turbine with 100 W to act as an efficient electric power supplier for households and also the stable manufacturing process for complex spiral blades using injection molding.

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