Transient Stability Of Wind Farm Research Articles

Hybrid adaptive controlled flywheel energy storage units for transient stability improvement of wind farms

This article introduces a novel hybrid adaptation algorithm comprising both continuous mixed p-norm (CMPN) strategy and the block-sparse Bayesian (BSB) technology to online adapt all the proportional plus integral (PI) controller gains of the power converters of flywheel energy storage units (FESUs). The FESU is based on the doubly fed induction machine (DFIM). The principal target is to improve the transient stability of grid-connected wind farms. To obtain a realistic study, the two-drive train model is utilized in the wind farm modeling affecting the transient analyses. The cascaded control scheme is implemented on controlling both the generator side converter and the grid side inverter of the FESU using the proposed adaptive CMPN-BSB PI controller. The FESU is tied to the point of common coupling of the wind farm, which is tied to the standard IEEE 39 bus system. The performance of the proposed technology is tested under subject the system to different severe faults. The validity of adaptive CMPN-BSB PI controlled FESU is tested by comparing the numerical results with that achieved by least mean square adaptive controlled FESU. The numerical results are performed by PSCAD software. The proposed controlled FESUs will help in improving the transient stability of wind farms and their power quality concerns will be enhanced.

Impact of Dispersed Wind Farms’ Integration on Transient Stability of Interconnected Grid

In this paper, transient stability of wind farm based on Double-Fed Induction Generators is analyzed and discussed. The uncertainty of wind power production is a challenge to maintain the grid’s power stability. Thus, the contribution of integrating wind farms to the stability of the electrical systems during contingencies depends on several factors, including the location of the wind turbines in the electricity grid, the reliability of transmission lines, the relaying algorithms, the utilized protection devices and the wind turbines’ integration mode. This paper studies the benefits of wind turbines’ dispersed integration in the electrical grid by simulating transient stability voltage, current and rotor angle. Based on a real scenario involving a short circuit fault in the grid, a comparison between different types of wind turbines’ integration in the grid’s power has been established, using an optimal power flow calculation. In addition, this work discusses the reduction of power generation costs, based on the cubic cost model, which has been achieved by integrating the wind farm and comparing the production cost to the conventional power plants’. The aim of this article is to prove that the integration of wind farms in dispersed mode can be used as an alternative solution since it stabilizes grid parameters during strong transients. In fact, the response of active and reactive power to the output of the wind farm is stable during short-circuit faults, it minimizes the tripping events in the grid, it reduces energy losses, and ultimately it decreases energy production costs by optimizing the power flow when injected into high-demand PQ buses.

A Method of Boosting Transient Stability of Wind Farm Connected Power System Using S Magnetic Energy Storage Unit

A Method of Boosting Transient Stability of Wind Farm Connected Power System Using S Magnetic Energy Storage Unit

Design and Simulation of a New Sliding Mode Controller for STATCOM Based Wind Farm

Sliding mode controller (SMC) is a highly significant nonlinear controller under condition of certain and partly uncertain dynamic parameters of system. This paper focused on design and implementation of a sliding mode controller for STATCOM. Intend for its application to wind farm connection to the grid. The proposed inverse system sliding mode controller based on nonlinear feedback linearization technology for system decoupling, which enhance the transient stability of wind farms and stabilizes the grid voltage about the given operating point when the fault occurs closer to the wind farms. The simulation results have shown the improved performance of the proposed controller has better control effectiveness and efficiency compared with the conventional controller of inverse system , the proposed controller on wind power system and which assist in improving capability of the wind farms to ride through disturbances, dynamic power flow control of the transmission lines, enhancing power oscillation damping under a sudden fault. Moreover, the proposed control scheme is very simple and easy to implement.

Simulation of the Affected Wind Power Transient Stability by Means of SVC and STATCOM

In the paper the models of IG and DFIG have been analyzed, and then the two reactive power compensations SVC and STATCOM have been introduced. Finally, use the simulation software of power system PSCAD to simulate the process of wind power integrating into grid. In the simulation results, it’s obvious that the DFIG has better transient stability than IG; install SVC or STATCOM can improve transient stability of wind farm, but SVC is apt to cause harmonic pollution, and STATCOM can improve transient stability to both kinds of generators.

Application of STATCOM to Increase Transient Stability of Wind Farm

In this paper we interested to the study the necessary of Facts to increase the transient stability on the presence of faults and the integration of new renewable source, like wind energy, these lasts make the electrical grid operate in a new conditions, the STATCOM is one of the important Facts element, It provides the desired reactive-power generation and absorption entirely by means of electronic processing of the voltage and current waveforms in a voltage source converter (VSC). This function is identical to the synchronous condenser with rotating mass. In present work we propose a transient stability improvement using STATCOM under faults, in the first time we study the transient stability with and without STATCOM for clearly his advantages. In the second time we know the relation between the reactive power injecting by a STATCOM and the critical clearing time, some simulation results are given, commented and discussed.

Transient Stability Improvement of a FSIG Based Grid Connected wind Farm with the help of a SVC and aSTATCOM: A Comparison

The contribution of wind power in conventional generation is increasing rapidly now-a-days. Hence a better understanding of wind power plants is required. But the wind power plants generally containing induction generators exhibit a rather different behavior than the conventional power plants which use synchronous generators. The purpose of this paper is to analyze and study transient stability of a wind farm based on conventional fixed speed Induction generator when it has been integrated with a weak grid. A comparative analysis of the transient stability improvement of a FSIG wind plant has been done, when it is supported with FACTS like S.V.C and STATCOM of equal ratings. Single case of transient condition i.e. a three phase fault has been studied by simulation. With the increase in demand of power and decrease of fossil fuels, mankind has been forced to search alternative sources for the generation of electricity. Wind power in spite of being stochastic in nature has proved itself as a viable solution to this problem. As the wind turbine technology is developing at a good pace, more and more wind power plants are being integrated with the conventional form of generation. With the increase in the ratio of wind generation to conventional generation, several problems related with integration of wind farms have emerged. These problems are due to distinct properties of the generators used with the conventional form (Thermal & Hydro) of generation and wind based generation (1)-(4). In thermal and hydro power based generation synchronous generators are used while in wind based generation mostly induction generators are used. Induction and synchronous generators do not exhibit similar behavior during power system stresses (transients). Moreover, increase in wind power based generation requires a reliable transmission system for power evacuation to the load centers. As the wind farms are mainly concentrated in far flung and rural areas their interconnection with the grid becomes a problem. This problem is mainly due to the existence weak transmission grids in the rural areas (1)-(4). Earlier when the share of wind power generation as compared with the conventional generation was low, during transient conditions; whenever the power system reached on the verge of instability the wind farm was disconnected from the grid and was reconnected when transients passed away. But as the share of wind power in the conventional generation increased, the practice of disconnecting the wind farms from the rest of the grid led to the drop in frequency of the power system. So now-a- days even if a fault occurs in the power system somewhere near the wind farms, they still remain connected with the grid for a critical time period. This phenomenon is called fault ride through (FRT) in wind farms (5). This paper has studied a transient condition (fault) in a grid connected fixed speed induction generator based wind farm and its fault ride through performance. A comparison of the performance of fact devices like static var compensators (svc) and static synchronous compensators (statcom) in improving the transient stability of wind farms during fault is also done.

Complete wind farm electromagnetic transient modelling for grid integration studies

This paper presents a modelling methodology to analyse the impact of wind farms in surrounding networks. Based on the transient modelling of the asynchronous generator, the multi-machine model of a wind farm composed of N generators is developed. The model incorporates step-up power transformers, distribution lines and surrounding loads up to their connection to the power network. This model allows the simulation of symmetric and asymmetric short-circuits located in the distribution network and the analysis of transient stability of wind farms. It can be also used to study the islanding operation of wind farms.