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Intelligent power and systems (ICIPS), International Conference on

作者： Jingyue Zhang Jie Zhang Yufeng Hu Yuanhong Lu Libin Huang Yanjun Zhao Haiping Guo State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou 510663 China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou 510663 China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou 510663 China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 Guangzhou China

ISBN: (数字)9798331532765

ISBN: (纸本)9798331532772

Addressing the stability challenges posed by the unpredictability and intermittent nature of wind power output during grid integration, and aiming to enhance the understanding of factors influencing grid stability upon wind power system connection and to implement efficient control measures, a grid- connected model of a doubly fed induction generator (DFIG) was established utilizing a customized version of the RTRES (Real-Time power system Simulation) software, specifically designed for emerging power systems and aligned with wind farm realities. Stability simulations for grid connection were conducted under both voltage regulation mode and reactive power regulation mode across a range of wind speeds, revealing distinct technical behaviors. The findings suggest that the generator's terminal voltage, terminal current, active power, reactive power, and rotor speed exhibit strong correlations with variations in wind speed, and that all parameters are capable of stabilizing following initial disturbances.

关键词： Reactive power Wind speed Rotors power system stability Wind power generation Stability analysis Software Regulation Wind turbines Voltage control

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Localization Method of Underwater Robot Based on Sonar Image 5

Localization Method of Underwater Robot Based on Sonar Image

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5th International Conference on Information Communication and Signal Processing, ICICSP 2022

作者： Li, Lirong Mei, Bing Chen, Peng Yu, Liang Gong, Pengcheng Hubei University of Technology Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Wuhan China Hubei University of Technology Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Wuhan China School of Mechanical Engineering Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai China School of Computer Science & Engineering Wuhan Institute of Technology Wuhan China

ISBN: (纸本)9781665485890

In this paper, we propose a positioning algorithm based on sonar images, which is mainly used for the positioning of underwater robots, so that the robots can obtain the position information in real time when operating underwater and avoid colliding with the underwater walls. First, the underwater space was detected with multibeam sonar, and the sonar images of the underwater space wall were found to have line segment characteristics;Composite denoising, threshold segmentation and Canny edge detection are applied to the sonar image to extract the contours of the underwater spatial wall. Then the characteristic line segments of the underwater spatial wall are detected based on the LSD (Line Segment Detector) line segment detection algorithm. In terms of line segment classification, a method is proposed to effectively classify line segments using the origin of the sonar image and the slope of the detected line segment. To further demonstrate the effectiveness of the localization algorithm in this paper, the specific steps of the algorithm are illustrated with the example of underwater rectangular space. © 2022 IEEE.

关键词： Image segmentation

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Bilateral Virtual Inertia control Scheme for Interlinking Converter in Islanded Hybrid Ac/Dc Microgrid

SSRN

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SSRN 2023年

作者： Li, Feng Qin, Wenping Ren, Chunguang Wang, Jinning State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300401 China Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan030024 China The University of Tennessee KnoxvilleTN37996 United States

Lack of inertia has threatened the stability of islanded hybrid AC/DC microgrid dominated by renewable energy sources. This paper proposes a novel bilateral virtual inertia control (BVIC) scheme for the interlinking converter (IC) in islanded hybrid AC/DC microgrid, which can autonomously provide inertia responses to both the AC frequency and the DC voltage through the IC. Moreover, besides the fundamental mutual power support capability through the IC, the proposed BVIC scheme can strengthen the mutual inertia support between AC and DC sub-microgrids. The proposed BVIC scheme is communication-free as the essential information of both AC and DC sub-microgrids for control can be detected locally by the IC. Small signal model of the BVIC scheme is established to explore the effects of crucial control parameters on the system stability. The effectiveness of the proposed BVIC scheme is verified through both simulations and hardware experiments, compared with the traditional droop control without inertia responses. © 2023, The Authors. All rights reserved.

关键词： system stability

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A control Strategy for T-Type Three-Level Converter to Suppress Midpoint Voltage Fluctuation

A Control Strategy for T-Type Three-Level Converter to Suppr...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Guanfei Hao Chunguang Ren Baifu Zhang Jiansheng Kong Dongxin Guo Xiaoqing Han Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

T-type three-level converter is widely used in high-current and low- voltage fields owing to its small number of power devices, low on state loss and high power density. Midpoint potential balance control of T-type converter is one of its key technologies. The neutral point potential imbalance increases harmonic distortion rate of output voltage and current, and reduce service life of DC side capacitor. This paper proposes midpoint potential balance control strategy in view of PIR-controlled zero-sequence voltage to control offset and fluctuation of midpoint potential. Functional model between midpoint current, reactive current and active current and the functional link between SPWM and SVPWM are established. The control strategy is simple in calculation and fast in dynamic response. It can realize midpoint potential balance domination under different power factors and the suppression of low-frequency voltage pulsation. Ultimately, simulations verify the effectiveness and correctness of proposed domination tactics.

关键词： Space vector pulse width modulation Electric potential Reactive power Fluctuations Voltage fluctuations Capacitors Modulation

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Combination Result of Two MPPT Techniques (Fuzzy Logic and Perturb and Observe Method): Comparison with The Conventional Perturb and Observe Method

Combination Result of Two MPPT Techniques (Fuzzy Logic and P...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Djikeussi Ghislain Xuejin Li Shanxi Key Lab. of Power System Operation and Control Taiyuan university of technology Taiyuan China

ISBN: (纸本)9781665434263

Extracting maximum power from a photovoltaic generator, regardless of meteorological conditions, remains a challenge in the field of solar photovoltaics. Therefore, techniques have been developed to find the best operating point of a photovoltaic module. These include the conventional perturbation and observation method and the fuzzy logic technique. In this paper, we present the combination of two MPPT methods, namely the perturbation and observation method and the fuzzy logic method. We aim to show whether the combination of two different MPPT techniques for a solar system is more accurate and efficient in determining the peak power point than the conventional perturbation and observation method alone.

关键词： Maximum power point trackers Photovoltaic systems Fuzzy logic Perturbation methods system integration Generators Solar system

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Reliability Assessment of Wind Farm with Wind Turbine Gearbox Fatigue

Reliability Assessment of Wind Farm with Wind Turbine Gearbo...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jiali Wang Xiaoqing Han Tianhao Song Yanbing Jia Shanxi Key Lab.of Power System Operation and Control Taiyuan University of Technology Tauyuan China

ISBN: (纸本)9781665434263

The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability.

关键词： Analytical models Wind farms Wind power generation Markov processes Fatigue power system reliability Wind turbines

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A control Strategy of CLLLC DC Transformers under Unbalanced AC Voltage Conditions in Hybrid Microgrids

A Control Strategy of CLLLC DC Transformers under Unbalanced...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jiansheng Kong Chunguang Ren Xinwei Wei Yue Qin Dongxin Guo Baifu Zhang Yifan Wang Xuejin Li Guanfei Hao Shanxi Key Lab. of Power System Operation and Control Taiyuan Unversity of Technology Taiyuan China

ISBN: (纸本)9781665434263

Under unbalanced AC microgrid voltage conditions in hybrid microgrids, DC microgrid bus will generate double frequency ripple voltage pulsation, which damages the voltage stability. In order to suppress the double-frequency pulsation, a control strategy suitable for CLLLC DC transformers is proposed in this paper. First, an equivalent model is established by first harmonic approximation to describe the fundamental wave of CLLLC DC transformers. On the basis, its voltage gain characteristics and input impedance characteristics can be analyzed. Then, considering the feature of the input voltage pulsation of the DC transformer under unbalanced voltage conditions, the parameters of the DC transformer are optimized according to the design index. Therefore, a control strategy based on the double frequency ripple voltage pulsation feed-forward is proposed and the PR controller is adopted to effectively suppress the DC bus voltage fluctuation when the input voltage is pulsing. Finally, the proposed voltage feedforward control strategy and parameter optimization de-sign are verified by the Matlab/Simulink results.

关键词： Voltage fluctuations Microgrids Transformers Mathematical models Indexes Impedance Voltage control

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Dynamic Security Evaluation Method for power systems Considering Cascading Failures

Dynamic Security Evaluation Method for Power Systems Conside...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Ren Liu Xingye Xu Wei Du Kaishun Xiahou Yihua Zhu Dongxu Chang Hengdao Guo CSG Key Laboratory for Power System Simulation Electric Power Research Institute of China Southern Power Grid Guangzhou China School of Electric power engineering South China University of Technology Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute of China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of China Southern Power Grid Intelligent Operation and Control for New Energy Power System Guangzhou China

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. Simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators.

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Research on Transforming Effect and Calculation Method of MMC Converter on AC / DC Harmonics

Research on Transforming Effect and Calculation Method of MM...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Cui, Liu Peng, Guangqiang He, Jingsong Wu, Jiyang Mao, Chizu Jiao, Ning Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc 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 Maintenance Test Center Ehv Power Transmission Company Guangzhou China Csg Key Laboratory for Dc Transmission Equipment State Evaluation and Fault Diagnosis GuangZhou China Sichuan University College of Electrical Engineering and Information Technology Chengdu China

ISBN: (纸本)9781665414395

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVDC). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and DC systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and DC networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVDC projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and DC sides of MMC converters has not been studied in depth. In this paper, by studying the AC/DC harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/DC harmonics;through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results. © 2021 IEEE.

关键词： Transmissions

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SOC balancing strategy for parallel-connected power conversion system based on PQ decoupling control

SOC balancing strategy for parallel-connected power conversi...

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20th International Conference on AC and DC power Transmission 2024 (ACDC 2024)

作者： Ziyi Xiong Aizuo Chen Yanglin Zhou Jinyu Wang Song Ci Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 People's Republic of China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710000 People's Republic of China

ISBN: (数字)9781837241552

Nowadays the battery energy storage system (BESS) plays a significant role in power grid due to its excellent function in energy regulation. In most cases, BESS connects to the power grid through power Conversion system(PCS). However, the state of charge (SOC) of different battery modules tend to be different during the working process. The difference bet ween SOC would intensify buckets effect, and the performance of BESS would be degraded due to the abnormal feature (low SOC) of single battery cell. To avoid such shortcoming, it is necessary to eliminate the difference of SOC though control strategy. In this paper, we propose a SOC balancing strategy for parallel-connected power conversion system based on PQ decoupling control, which can also adjust the active power output of each battery module converge to optimization solution. Simulation and experimental results from a 2 × 700V, parallel-connected power converter system are presented in order to validate the method.

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