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Transient Stability Preventive Control of wind farm Connected Power System Considering the Uncertainty

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Energy Engineering 2024年第6期121卷 1637-1656页

作者： Yuping Bian Xiu Wan Xiaoyu Zhou School of Electric Power Engineering Nanjing Institute of TechnologyNanjing211167China

To address uncertainty as well as transient stability constraints simultaneously in the preventive control of windfarm systems, a novel three-stage optimization strategy is established in this paper. In the first stage, the probabilisticmulti-objective particle swarm optimization based on the point estimate method is employed to cope with thestochastic factors. The transient security region of the system is accurately ensured by the interior point methodin the second stage. Finally, the verification of the final optimal objectives and satisfied constraints are enforcedin the last stage. Furthermore, the proposed strategy is a general framework that can combine other optimizationalgorithms. The proposed methodology is tested on the modified WSCC 9-bus system and the New England 39-bussystem. The results verify the feasibility of the method.

关键词： Transient preventive control chance-constrained programming multi-objective PSO TSCOPF wind farm

wind farm active power dispatching algorithm based on Grey Incidence

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Global Energy Interconnection 2023年第2期6卷 175-183页

作者： Binbin Zhang Mengxin Jia Chaobo Chen Kun Wang Jichao Li School of Electronic and Information Engineering Xi’an Technological UniversityXi’an 710021P.R.China

This study proposes a wind farm active power dispatching(WFAPD) algorithm based on the grey incidence method, which does not rely on an accurate mathematical model of wind turbines. Based on the wind turbine start-stop data at different wind speeds, the weighting coefficients, which are the participation degrees of a variable speed system and a variable pitch system in power regulation, are obtained using the grey incidence method. The incidence coefficient curve is fitted by the B-spline function at a full range of wind speeds, and the power regulation capacity of all wind turbines is obtained. Finally, the WFAPD algorithm, which is based on the regulating capacity of each wind turbine, is compared with the wind speed weighting power dispatching(WSWPD) algorithm in MATLAB. The simulation results show that the active power fluctuation of the wind farm is smaller, the rotating speed of wind turbines is smoother, and the fatigue load of highspeed turbines is effectively reduced.

关键词： wind farm Active power dispatching Grey incidence B-spline function

Fast Distance Protection Scheme for wind farm Transmission Lines Considering R-L and Bergeron Models

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 840-852页

作者： Zepeng Hu Bin Li Yuping Zheng Tonghua Wu Jiawei He Bin Yao Yaru Sheng Wei Dai Xindong Li Electrical Engineering and Automation Tianjin UniversityTianjinChina State Key Laboratory of Smart Grid Protection and Control NARI Group CorporationNanjingChina

The distributed capacitance of the line becomes larger as the scale of wind farms,the transmission voltage level,and the transmission distance ***,the error of the traditional time-domain distance protection scheme based on the R-L model,which ignores the distributed capacitance of the line,becomes ***,the error of the time-domain fault location method based on the R-L model,especially the maximum error range,is theoretically analyzed in this *** this basis,a novel fault location method based on the RL and Bergeron models is ***,a fast time-domain distance protection scheme is *** the proposed scheme,the error in the fitting calculation is used to construct a weight matrix,and an algorithm for solving the time-domain differential equations is designed to improve the calculation speed and *** with the traditional frequency-domain distance protection scheme,the proposed scheme is independent of the power supply characteristics;thus,it is suitable for wind farm transmission *** addition,compared with the traditional method based on the R-L model,the proposed scheme effectively avoids the negative influence of the distributed capacitance of the line,which significantly improves the operating *** types of faults are simulated by PSCAD/EMTDC to verify the effectiveness and superiority of the proposed scheme.

关键词： Transmission line R-L model time-domain distance protection wind farm

Analysis and stabilization control of a voltage source controlled wind farm under weak grid conditions

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Frontiers in Energy 2022年第6期16卷 943-955页

作者： Shun SANG Chen ZHANG Jianwen ZHANG Gang SHI Fujin DENG School of Electrical Engineering Nantong UniversityNantong 226019China Key Laboratory of Control of Power Transmission and Conversion of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering Southeast UniversityNanjing 210096China

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)*** primary intention of the VS control method is to achieve the high-quality inertial response capability of a single ***,when it is applied to multiple WTs within a wind farm,its weakgrid performance regarding the stability remains concealed and needs to be *** this end,a frequency domain model of the wind farm under the VS control is first *** 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 *** on this knowledge,a stabilization control strategy is then proposed,aiming for stability improvements of VS control while fulfilling the demand of inertial ***,all the results are verified by time-domain simulations in power systems computer aided design/electromagnetic transients including DC(PSCAD/EMTDC).

关键词： weak grids voltage source(VS)control wind turbine(WT) stabilization control wind farm inertial response

Frequency Regulation of Power Systems With a wind farm by Sliding-Mode-Based Design

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IEEE/CAA Journal of Automatica Sinica 2022年第11期9卷 1980-1989页

作者： Zhiwen Deng Chang Xu the College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China

Load frequency regulation is an essential auxiliary service used in dealing with the challenge of frequency stability in power systems that utilize an increasing proportion of wind *** investigate a load frequency control method for multiarea interconnected power systems integrated with wind farms,aimed to eliminate the frequency deviation in each area and the tie-line power deviation between different *** method explores the derivative and integral terminal sliding mode control technology to solve the problem of load frequency *** technology employs the concept of relative ***,the subsystems of wind-integrated interconnected power systems have different relative degrees,complicating the control *** study develops the derivative and integral terminal sliding-mode-based controllers for these subsystems,realizing the load frequency ***,closed-loop stability is guaranteed with the theory of Lyapunov ***,both a thermal power system and a wind power system are applied to provide frequency support in this *** both constant and variable external disturbances,several numerical simulations were carried out in a two-area thermal power system with a wind *** results demonstrate the validity and feasibility of the developed method.

关键词： Load frequency control(LFC) power system sliding mode control(SMC) wind farm

Coordination Control Method for Preventing Sub/Super Synchronous Oscillations of Multi-wind farm Systems

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1655-1665页

作者： Guoqing He Weisheng Wang Haijiao Wang China Electric Power Research Institute Beijing 100192China

In recent years,sub/super-synchronous oscillations occur frequently in large-scale wind power bases throughout *** the oscillation frequencies are close to the fundamental frequency,the current components can spread over a large area,and may destroy the shafting of rotating devices in the power *** the control strategy and parameters of wind turbines can prevent this problem to some extent,however,due to complex operational conditions and continuous development of wind power,the off-line improvement measures on wind turbines cannot eliminate the potential oscillation *** paper proposes an oscillation risk screening and stability assessment method,and develops a coordination control method for large-scale wind farm systems to prevent sub/supersynchronous *** Nyquist criterion and the modal analysis method are combined to generate quantitative factors for the stability assessment and the control strategy *** coordination control method consists of minute-level power coordinated allocation and second-level fast power control to prevent and eliminate the oscillations.A detailed simulation model of a multiple wind farms system originated from an actual wind power base in China is presented to verify the effectiveness of the proposed method.

关键词： Coordination control prevention sequence impedance sub/super-synchronous oscillations wind farm

Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based wind farm Integration System

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 634-639页

作者： Ke Ji Hui Pang Shan Liu Guangfu Tang China Electric Power Research Institute Beijing100192China Global Energy Interconnection Research Institute Beijing 102211China

Employing the AC/DC impedance analysis method,extensive research has been conducted on issues pertaining to harmonic resonance observed in wind farm-connected MMCHVDC systems over the past 5 *** general,this method divides the studied system into two subsystems at AC and DC ***,the impedance produced by these subsystems can be used to determine the system stability by implementing Nyquist criterion or generalized Nyquist stability ***,the existing impedance analysis methods usually assume the subsystems to be stable and disregard certain special cases with potentially unstable subsystems,where the unstable poles of these subsystems must be evaluated before applying Nyquist *** view of this consideration,a simplified method for identifying unstable subsystem poles is presented in this ***,the shortcoming of existing impedance analyses is rectified by considering the unstable subsystem *** proposed method and the stability analyses are validated by the electromagnetic transient simulation performed in PSCAD/EMTDC.

关键词： AC/DC side impedance method harmonic resonance MMC-HVDC small-signal stability wind farm

Coordinated control by ADRC strategy for a wind farm based on SCIG considering low voltage ride-through capability

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Protection and Control of Modern Power Systems 2022年第1期7卷 82-99页

作者： Hammadi Laghridat Ahmed Essadki Tamou Nasser Higher National School of Arts and Crafts(ENSAM) Mohammed V UniversityRabatMorocco National High School for Computer Science and Systems Analysis(ENSIAS) Mohammed V UniversityRabatMorocco.

wind farms are integrated with the power grid system to provide active and reactive *** in a wind farm,wind turbines(WTs)are highly coupled to their operating conditions,a central wind farm supervisory unit must take into account these conditions when producing power control references for each *** aim of this paper is to man-age and control the active and reactive power of wind farms based on squirrel cage induction generators and back-to-back *** proportional distribution algorithm is used for distributing wind farm power to individual *** addition,we consider the development of a local power management and control units for *** is in order to extract the maximum available power from the wind,and to provide the active and reactive power predetermined by the transmission system operator,or to satisfy the grid code requirements considering Low Voltage Ride-through *** power dispatch strategy is to be used on all WTs using the distribution algorithm while ensuring the control loops using the proposed Active Disturbance Rejection Control *** results demonstrate that the proposed strategies are efficient and can guarantee the safe integration of wind farms into the grid while respecting grid code requirements and power system stability.

关键词： wind farm wind generator SCIG ADRC Supervision Control

Cyber-physical Modeling Technique based Dynamic Aggregation of wind farm Considering LVRT Characteristic

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CES Transactions on Electrical Machines and Systems 2023年第2期7卷 229-236页

作者： Guiqing Ma Yunlu Li Junyou Yang Bing Wu the School of Electrical Engineering Shenyang University of TechnologyShenyang110870China IEEE

With the increasing penetration of wind power,large-scale integrated wind turbine brings stability and security risks to the power *** the aggregated modeling of large wind farms,it is crucial to consider low voltage ride-through(LVRT)***,in aggregation methods,the approximate neglect behavior is essential,which leads to inevitable errors in the aggregation ***,the lack of parameters in practice brings new challenges to the modeling of a wind *** address these issues,a novel cyber-physical modeling method is *** method not only overcomes the aggregation problem under the black-box wind farm but also accurately realizes the aggregation error fitting according to the operation *** simulation results reveal that the proposed method can accurately simulate the dynamic behaviors of the wind farm in various scenarios,whether in LVRT mode or normal mode.

关键词： wind farm Aggregated model Low voltage ride through Operation data