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Electro-mechanical Modeling of Wind Turbine and Energy Storage Systems with Enhanced Inertial Response 被引量:6
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作者 Weihang Yan Xiao Wang +1 位作者 Wei Gao Vahan Gevorgian 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2020年第5期820-830,共11页
In this paper,a coordinated control scheme for wind turbine generator(WTG)and supercapacitor energy storage system(ESS)is proposed for temporary frequency supports.Inertial control is designed by using generator torqu... In this paper,a coordinated control scheme for wind turbine generator(WTG)and supercapacitor energy storage system(ESS)is proposed for temporary frequency supports.Inertial control is designed by using generator torque limit considering the security of WTG system,while ESS releases its energy to compensate the sudden active power deficit during the recovery process of turbine rotor.WTG is modeled using the fatigue,aerodynamic,structure,turbulence(FAST)code,which identifies the mechanical loadings of the turbine and addresses electro-mechanical interactions in the wind energy system.A damping controller is augmented to the inertial control to suppress severe mechanical oscillations in the shaft and tower of the turbine during frequency supports.Furthermore,the result of small-signal stability analysis shows that the WTGESS tends to improve the stability of the whole multi-energy power grid.The major contributions of this paper will be validated by utilizing the proposed control method that combines the grid support capability and maintaining the integrity of structural design of the turbine for normal operations. 展开更多
关键词 inertial response wind turbine generator(WTG) SUPERCAPACITOR coordinated control electro-mechanical transient structural mode
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Decoupling Scheme for Virtual Synchronous Generator Controlled Wind Farms Participating in Inertial Response 被引量:3
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作者 Jiangbei Xi Hua Geng Xin Zou 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2021年第2期347-355,共9页
In this paper,the dynamic coupling between the wind turbine rotor speed recovery(WTRSR)and inertial response of the conventional virtual synchronous generator(VSG)controlled wind farms(WFs)is analyzed.Three distinguis... In this paper,the dynamic coupling between the wind turbine rotor speed recovery(WTRSR)and inertial response of the conventional virtual synchronous generator(VSG)controlled wind farms(WFs)is analyzed.Three distinguishing features are revealed.Firstly,the inertial response characteristics of VSG controlled WFs(VSG-WFs)are impaired by the dynamic coupling.Secondly,when the influence of WTRSR is dominant,the inertial response characteristics of VSG-WFs are even worse than the condition under which WFs do not participate in the response of grid frequency.Thirdly,this phenomenon cannot be eliminated by only enlarging the inertia parameter of VSG-WFs,because the influence of WTRSR would also increase with the enhancement of inertial response.A decoupling scheme to eliminate the negative influence is then proposed in this paper.By starting the WTRSR process after inertial response period,the dynamic coupling is eliminated and the inertial response characteristics of WFs are improved.Finally,the effectiveness of the analysis and the proposed scheme are verified by simulation results. 展开更多
关键词 Wind turbine rotor speed recovery(WTRSR) inertial response virtual synchronous generator(VSG) decoupling scheme
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Seismic response of bridge pier on rigid caisson foundation in soil stratum 被引量:5
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作者 C. Tsigginos N. Gerolymos +1 位作者 D. Assimaki G. Gazetas 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2008年第1期33-43,共11页
An analytical method to study the seismic response of a bridge pier supported on a rigid caisson foundation embedded in a deep soil stratum underlain by a homogeneous half space is developed. The method reproduces the... An analytical method to study the seismic response of a bridge pier supported on a rigid caisson foundation embedded in a deep soil stratum underlain by a homogeneous half space is developed. The method reproduces the kinematic and inertial responses, using translational and rotational distributed Winkler springs and dashpots to simulate the soil-caisson interaction. Closed-form solutions are given in the frequency domain for vertical harmonic S-wave excitation. Comparison with results from finite element (FE) analysis and other available solutions demonstrates the reliability of the model. Results from parametric studies are given for the kinematic and inertial responses. The modification of the fundamental period and damping ratio of the bridge due to soil-structure interaction is graphically illustrated. 展开更多
关键词 CAISSON embedded foundations kinematic response inertial response Winkler model effective period effective damping
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Optimal generation mix for frequency response adequacy in future power system
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作者 Vivek Prakash Kailash Chand Sharma Rohit Bhakar 《Energy and Built Environment》 2021年第3期243-250,共8页
Strict enforcement of government policies to integrate high generation share from renewable energy sources(RES)like wind and PV would create inevitable operational challenges for the utilities to deliver Frequency Res... Strict enforcement of government policies to integrate high generation share from renewable energy sources(RES)like wind and PV would create inevitable operational challenges for the utilities to deliver Frequency Response(FR)services.Uncertain RES generation characteristics would worsen the situation for SO,to detain initial frequency deviation following the largest generation outage.This necessitates investigation of optimal generator combination for securing PFR adequacy with simultaneous characterization of uncertainty.In this regard,this paper proposes a novel Modified Interval(MI)based optimal generation mix formulation for operation cost minimization and FR adequacy.RES uncertainty is characterised by forecasted upper and lower bound,while hourly ramp needs are based on the net load scenarios.Proposed model is assessed on one area IEEE reliability test system.Rate of change of frequency(ROCOF)and frequency deviation are considered as network security limits to obtain optimal generation mix.Results obtained provide,overall cost performance,PFR and optimal generation mix,without violating system security criteria.This model would certainly assist SO,to enhance system’s inertia and PFR adequacy at short-term system operations and could be extended for long-term planning framework. 展开更多
关键词 Frequency response Generation mix inertial response Net load Primary frequency response System security Unit commitment
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Uncertainty modeling of wind power frequency regulation potential considering distributed characteristics of forecast errors 被引量:12
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作者 Cheng Yan Yi Tang +2 位作者 Jianfeng Dai Chenggen Wang Shengjun Wu 《Protection and Control of Modern Power Systems》 2021年第1期276-288,共13页
Large-scale integration of wind power generation decreases the equivalent inertia of a power system, and thus makes frequency stability control challenging. However, given the irregular, nonlinear, and non-stationary ... Large-scale integration of wind power generation decreases the equivalent inertia of a power system, and thus makes frequency stability control challenging. However, given the irregular, nonlinear, and non-stationary characteristics of wind power, significant challenges arise in making wind power generation participate in system frequency regulation. Hence, it is important to explore wind power frequency regulation potential and its uncertainty. This paper proposes an innovative uncertainty modeling method based on mixed skew generalized error distribution for wind power frequency regulation potential. The mapping relationship between wind speed and the associated frequency regulation potential is established, and key parameters of the wind turbine model are identified to predict the wind power frequency regulation potential. Furthermore, the prediction error distribution of the frequency regulation potential is obtained from the mixed skew model. Because of the characteristics of error partition, the error distribution model and predicted values at different wind speed sections are summarized to generate the uncertainty interval of wind power frequency regulation potential. Numerical experiments demonstrate that the proposed model outperforms other state-of-the-art contrastive models in terms of the refined degree of fitting error distribution characteristics. The proposed model only requires the wind speed prediction sequence to accurately model the uncertainty interval. This should be of great significance for rationally optimizing system frequency regulation resources and reducing redundant backup. 展开更多
关键词 inertial response Primary frequency control Error distribution Mixed skew generalized error distribution Uncertainty modeling
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Autonomous Dual Active Power-frequency Control in Power System with Small-scale Photovoltaic Power Generation
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作者 Noha Harag Masaki Imanaka +3 位作者 Muneaki Kurimoto Shigeyuki Sugimoto Hassan Bevrani Takeyoshi Kato 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2022年第4期941-953,共13页
Active power control of the photovoltaic(PV)power generation system is a promising solution to regulate frequency fluctuation in a power system with high penetration of renewable energy.This paper proposes an autonomo... Active power control of the photovoltaic(PV)power generation system is a promising solution to regulate frequency fluctuation in a power system with high penetration of renewable energy.This paper proposes an autonomous active power control of a small-scale PV system for supporting the inertial response of synchronous generators and power-frequency control.In the proposed control approach,an effective grid frequency regulation scheme is realized using slow-and fast-frequency responses.A low-pass filter based frequency measurement is used for slow-frequency response,while direct frequency measurement is used for fast-frequency response.The designed dual droop characteristic-based control is shaped to achieve a smooth transition between slow-and fast-frequency responses.The performance of the proposed control approach is demonstrated for serious disturbance scenarios,i.e.,considerable power-load imbalance and generation trip.In the powerload imbalance test scenario,the proposed control approach works properly within the normal frequency deviation region even when the frequency deviation exceeds that region occasionally.In the generation trip test,the frequency deviation is mitigated quickly,and the employed droop control is smoothly transferred from the slow-to fast-frequency responses. 展开更多
关键词 Dual droop control fast-frequency response slow-frequency response inertial response power-frequency control regulation support
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Analysis and stabilization control of a voltage source controlled wind farm under weak grid conditions
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作者 Shun SANG Chen ZHANG +2 位作者 Jianwen ZHANG Gang SHI Fujin DENG 《Frontiers in Energy》 SCIE CSCD 2022年第6期943-955,共13页
This paper investigates and discusses the interaction stability issues of a wind farm with weak grid connections,where the wind turbines(WTs)are controlled by a new type of converter control strategy referred to as th... This paper investigates and discusses the interaction stability issues of a wind farm with weak grid connections,where the wind turbines(WTs)are controlled by a new type of converter control strategy referred to as the voltage source(VS)control.The primary intention of the VS control method is to achieve the high-quality inertial response capability of a single WT.However,when it is applied to multiple WTs within a wind farm,its weakgrid performance regarding the stability remains concealed and needs to be clarified.To this end,a frequency domain model of the wind farm under the VS control is first developed.Based on this model and the application of a stability margin quantification index,not only the interactions between the wind farm and the weak grid but also those among WTs will be systematically assessed in this paper.A crucial finding is that the inertial response of VS control has negative impacts on the stability margin of the system,and the dominant instability mode is more related to the interactions among the WTs rather than the typical grid-wind farm interaction.Based on this knowledge,a stabilization control strategy is then proposed,aiming for stability improvements of VS control while fulfilling the demand of inertial responses.Finally,all the results are verified by time-domain simulations in power systems computer aided design/electromagnetic transients including DC(PSCAD/EMTDC). 展开更多
关键词 weak grids voltage source(VS)control wind turbine(WT) stabilization control wind farm inertial response
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