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A Generalized Wind Turbine Anomaly Detection Method Based on Combined Probability Estimation Model

Journal of Modern power systems and Clean Energy 2023年第4期11卷 1136-1148页

作者： Xiangjun Zeng Ming Yang Chen Feng Yaohua Tang Key Laboratory of Power System Intelligent Dispatch and Control Shandong UniversityJinan 250061Chinaand X.Zeng is also with the College of Electrical Engineering&New EnergyChina Three Gorges UniversityYichang 443002China Rundian Energy Science and Technology Co. Ltd.Zhengzhou 450046China

Anomaly detection based on the data collected from the supervisory control and data acquisition(SCADA)system is crucial to reduce the failure rate of wind turbines(WTs).The difficulty of this kind of methods is to dynamically identify the threshold for anomaly detection under changing operating *** this paper,a generalized WT anomaly detection method based on the combined probability estimation model(CPEM)is *** CPEM can estimate the conditional probability density function(PDF)of the target variable given changing *** generalization and accuracy are better than those of the independent probability estimation model because it combines the advantages of various kinds of probability estimation models through linear *** using the CPEM,the normal operating bounds under different operating conditions can be obtained,which dynamically form the thresholds for anomaly ***,with respect to the thresholds,hypothesis testing(HT)is adopted to identify the anomaly by inspecting whether the observations exceed the thresholds at a given significance level,providing sound mathematical support for anomaly detection and making the detection results more *** effectiveness of the proposed method is tested by using the actual data of WTs with known *** results illustrate that the proposed method can detect the abnormal operating state of the gearbox and generator much more early than the system fault alarm.

关键词： Anomaly detection combined probability estimation generalization hypothesis testing(HT)

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Mechanism and Influencing Factor Analysis of High Frequency Oscillation in PMSG-Based Wind Farm With Grid-Connected system 6

Mechanism and Influencing Factor Analysis of High Frequency ...

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6th IEEE International Conference on Energy Internet, ICEI 2022

作者： Luo, Chao Zhu, Yihua Huang, Libin Yu, Jiawei Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (纸本)9781665493277

Under the background of vigorously developing wind power, permanent magnet synchronous generator (PMSG)-based wind turbines have been widely used in offshore wind farms. However, the high frequency oscillations (HFOs) of PMSG-based wind farms with grid-connected system have occurred frequently in recent years, which have a bad impact on the safe and stable operation of the power system. And current researches only preliminarily reveal the mechanism, which are lacking in discussion on the key factors involved in HFOs. This paper establishes the high frequency impedance model of PMSG-based wind farm with grid-connected system. To identify the key factors involved in HFO, the impedance sensitivity method is used to obtain the quantitative relationship of the influence of each parameter on HFO. It can be concluded that the control delay, LCL filter parameters, collector lines parameters have the greatest influence on the HFO of the wind farm, but the characteristic of negative resistance caused by control delay is the root cause of HFO. Finally, this paper establishes the model of PMSG-based wind farm with grid-connected system on the PSCAD/EMTDC and verifies the correctness of the theoretical analysis. The conclusions of this paper can provide a reference basis for the mitigation strategies of HFOs. © 2022 IEEE.

关键词： Permanent magnets

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A Networked Method Applied to Sensitivity Analysis of a VSG controlled BESS system 5

A Networked Method Applied to Sensitivity Analysis of a VSG ...

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5th International Conference on power Engineering, ICPE 2024

作者： Sun, Zhiyuan Luo, Chao Zheng, Kun Zhu, Yihua Yu, Jiawei Guangxi Power Grid Electric Power Research Institute China S. Power Grid Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guang zhou China National Energy Power Grid Technology R&d Centre Guang zhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (纸本)9798331531140

The grid-forming battery energy storage system (BESS) plays important role in constructing new energy system. This paper presents a frequency domain modal-based stability analysis of virtual synchronous generator (VSG) controlled BESS. Both ac and dc side interactive dynamics of the grid-tied inverter system are considered, by establishing a hybrid ac/dc impedance network. Then, the frequency domain modal analysis (FMA) method for networked converter systems is applied to the BESS system, covering the eigen-sensitivity from the node level to parameter level. Using this method, key parameters that influence the BESS system's weakly/negative damping modes most can be better analyzed and identified. The analysis results are validated via the time-domain simulations. © 2024 IEEE.

关键词： Frequency domain analysis

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power control of photovoltaic inverter under unbalanced grid faults considering limits of its current harmonics

Power control of photovoltaic inverter under unbalanced grid...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Zhou, Yu Dai, Zhi Yong Wang, Qiang Gang Ye, Ling Zhou, Nian Cheng Guiyang Power Supply Bureau Guiyang 550002 Guizhou China Planning center of Shenzhen Power Supply 518001 Shenzhen China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China

ISBN: (纸本)9783038351368

This paper studies the instantaneous output power characteristics of photovoltaic inverters and its flexible power control strategy under unbalanced grid faults. Then the optimal parameters model of the power control is established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the constraint of the output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the optimal power control of photovoltaic inverters based on dead-beat current tracking is realized and the feasibility of the proposed control strategy is verified with the power system transient software PSCAD/EMTDC. © (2014) Trans Tech Publications, Switzerland.

关键词： power control

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Three phase short circuit current evaluation of induction generator for wind turbine in distribution network

Three phase short circuit current evaluation of induction ge...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Li, Tao Dai, Zhi Yong Luo, Ai Qing Pan, Shu Xiong, Xi Cong Zhou, Nian Cheng Guiyang Power Supply Bureau Guiyang 550002 Guizhou China Planning center of Shenzhen Power Supply 518001 Shenzhen China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China

ISBN: (纸本)9783038351344

The transient characteristics of induction generator (IG) were investigated in the paper, and the analytic formula of its stator current under three-phase short circuit in distribution network was derived. According to the change law of IG rotor speed under the grid fault, an evaluation method to determine the current peak of three-phase short circuit for induction generator in distribution grid is proposed. The correctness of the proposed method was verified by the fifth electromagnetic transient model of IG in PSCAD/EMTDC simulation software. © (2014) Trans Tech Publications, Switzerland.

关键词： Timing circuits

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Modeling and control of solid oxide fuel cell generation system integrated in microgrid

Modeling and control of solid oxide fuel cell generation sys...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Xu, Wen Qiang Dai, Zhi Yong Wang, Qian Ggang Pan, Shu Zhou, Nian Cheng Guiyang Power Supply Bureau Guiyang 550002 Guizhou China Planning center of Shenzhen Power Supply 518001 Shenzhen China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing 400044 China

ISBN: (纸本)9783038351368

This paper presents a control strategy of solid oxide fuel cell (SOFC) generation system integrated into microgrid. To enhance the dynamic response of SOFC, storage battery is paralleled via a DC bus, and the hysteretic control of bi-directional DC-DC converter is adopted. The common DC-AC inverter adopts an improved droop control. The active synchronization control is applied to ensure the smooth mode transition of microgrid. The simulation results show the dynamic performance of SOFC generation system in different operation modes. © (2014) Trans Tech Publications, Switzerland.

关键词： DC-DC converters

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Modeling and testing of hybrid energy microgrid with wind turbine and photovoltaic power

Modeling and testing of hybrid energy microgrid with wind tu...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Zhang, Yu Feng Xu, Wen Qiang Dai, Zhi Yong Wang, Qian Ggang Zhou, Nian Cheng Guiyang Power Supply Bureau Guiyang 550002 Guizhou China Planning center of Shenzhen Power Supply 518001 Shenzhen China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing 400044 China

ISBN: (纸本)9783038351368

Modeling of the wind and PV hybrid microgrid is carried out by PSCAD/EMTDC. The model includes direct-drive wind power generator, Single-stage photovoltaic power generation system and storage battery. Simulate and analyze the operating characteristics of the microgrid running in grid-connected and islanding mode, which take into account the actual wind speed and light intensity. The simulation results show that the battery is able to regulate the voltage of the point of common coupling and smooth the power fluctuation of wind generator and PV generation system in the grid-connected mode. The microgrid can isolate itself from the grid in a rapid and seamless fashion when the battery adopting P/V and Q/f control strategy based on the droop characteristics. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind power

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Study on the excitation inrush suppression strategy of phase-selective switching converter with closing resis-tor switch considering dispersion 10

Study on the excitation inrush suppression strategy of phase...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Liu, Zhijiang Lin, Xuehua Huang, Libin Li, ShuYong State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid. Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

A detailed analysis of the excitation inrush current bias phenomenon in the event is carried out in the context of a certain time when charging of a converter is carried out in an ultra-high voltage DC project of the Southern China power Grid to obtain the cause of the event, which is confirmed by RTDS tests. By analysing the relationship between the moment of closing of different auxiliary contacts and the intermittent angle of the excitation inrush current, the shortest input time at which the closing resistance can play a role in weakening the excitation inrush current is proposed at different moments of closing. Finally, considering the discrete nature of circuit breaker closing, the proposed closing resistor best access time and the best closing angle, the effectiveness of the proposed strategy is verified by simulation tests. © 2022 IEEE.

关键词： Electric circuit breakers

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Nonlinear Modeling of the VSC Grid-Connected system with Controller Saturation 4

Nonlinear Modeling of the VSC Grid-Connected System with Con...

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4th International Conference on Electrical Engineering and Control Technologies, CEECT 2022

作者： Yu, Jiawei Zhu, Yihua Li, Chengxiang Luo, Chao State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&d Center Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power Sytem Simiulation ELectic Power Reasearch Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665498999

With the development of power electronics technology, the power system is now evolving into a new-generation power system dominated by renewable energy. Due to the physical limitations of power electronics, controller saturation is widely adopted in wind turbines and photovoltaics. In this paper, a nonlinear system model considering output saturation is proposed in the view of general dynamic systems. By defining saturation-activation vector L, all the saturations of the system are uniquely represented. Then, the proposed modeling method is applied to a voltage source converter (VSC) grid-connected system. Based on RTDS simulation, this paper revealed that a class of oscillations at a specific frequency are caused by the activation of the phase-locked loop (PLL) saturation. The frequency of the oscillation depends on the top and bottom boundaries of PLL saturation. © 2022 IEEE.

关键词： Chemical activation

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Conflict Mechanism Analysis Method for Electric Vehicles Participating in Multiple Types of power Grid Ancillary Services

Conflict Mechanism Analysis Method for Electric Vehicles Par...

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2023 International Conference on power system technology, powerCon 2023

作者： Xue, Yinjuan Chen, Qifang Cai, Haiqing Xia, Mingchao Gu, Haohan School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350300222

As the high-quality flexible resource of the grid, electric vehicles (EVs) can provide multiple auxiliary services for the grid at the same time. However, due to the one-way charging and discharging of EVs, as well as the limitation of power and capacity, which may cause availability conflicts when EVs participate in different auxiliary services simultaneously. This paper focuses on the analysis of the conflict mechanism of EVs participating in the secondary frequency regulation and peak shaving ancillary services at the same time. The impact mechanism between different auxiliary services in this conflict mode is revealed from the two aspects of limit conflict and charging and discharging instruction conflict, and the results of availability conflict of the two types of auxiliary services are verified and analyzed through simulation examples. © 2023 IEEE.

关键词： Frequency modulation

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