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Limit behaviors of extended Kalman filter as a parameter estimator for a sinusoidal signal

control Theory and Technology 2018年第3期16卷 203-211页

作者： Li XIE State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 China

In this note, the basic limit behaviors of the solution to Riccati equation in the extended Kalman filter as a parameter estimator for a sinusoidal signal are analytically investigated by using lira sup and lim inf in... 详细信息

关键词： Extended Kalman filter parameter estimator sinusoidal signal covariance matrix limit behavior

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Wind farm active voltage regulation strategy of transient support improvement 8

Wind farm active voltage regulation strategy of transient su...

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8th Renewable power Generation Conference, RPG 2019

作者： Yang, Cui Peng, Song Xuekun, Cheng Ying, Qiao Xiaosheng, Wang Jingbo, Liu State Grid Jibei Electric Power Co.Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Xicheng District Beijing China Grid-connected Operation Technology Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Xicheng District Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The cumulative installed capacity of wind power worldwide has grown rapidly in recent years. Fixed reactive power control is adopted by wind turbines (WTs) to receive cycle instruction of wind farm (WF) automatic voltage control system (AVCS). It does not have active voltage regulation (AVR) capability, which reduces the reliability of power system operation. Firstly, two ways of WTs AVR which QV droop control and Vac control mode are introduced in this paper. On the basis, the problems of reactive power circulation and control points inconsistency during multiWTs voltage regulation are discussed. The problems are solved by coordination of WTs of WF AVR strategy. WF voltage transient support capability is promoted by the strategy. Effectiveness is verified by simulation case of the proposed method. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Reactive power

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Dynamic Reconfiguration of Distribution Network Based on Temporal Constrained Hierarchical Clustering and Fireworks Algorithm

Dynamic Reconfiguration of Distribution Network Based on Tem...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Yumin Zhang Xingquan Ji Jiabin Xu Ziyang Yin Xueshan Han Chao Zhang College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao China Dongying Power Supply Company State Grid Dongying China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

For the dynamic reconfiguration problem of distribution networks, the handling of switching cost constraint and the division of time period are the two key aspects that affect the performance of the reconfiguration algorithm. In this paper, an improved temporal constrained hierarchical clustering algorithm for dynamic reconfiguration of distribution networks is proposed. Firstly, the improved hierarchical clustering approach considering the temporal constraint is used to divide the operating status of the distribution network into multiple time intervals according to the similarity of loads and the output power of distributed generations (DGs). The dynamic reconfiguration of distribution networks is then transformed into multiple single-stage static reconfiguration problems, and the cluster center is used to approximately represent the load state and DG output state of the period. In order to reduce the number of infeasible solutions and poor solutions, a coding method based on heuristic rules to reduce the solution space of distribution network reconfiguration is proposed. An improved fireworks algorithm based on heuristic rules is proposed to solve the reconfiguration problem. Finally, a modified IEEE-33 test system is used to verify the validity of the proposed method.

关键词： Explosions Heuristic algorithms Switches Fireworks algorithm power system dynamics Sparks Clustering algorithms

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Heteroaggregation of functionalized nanoplastics with Al 2 O 3 particles in aquatic environments

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Chemical Engineering Journal 2025年 518卷

作者： Xia Liu Yating Zhao Tongtao Yue Bo Gao Xing Guo Meng Wang Wenli Su Chu Wang Lu Liu Yanhui Dai Zhenyu Wang Jian Zhao Baoshan Xing Frontiers Science Center for Deep Ocean Multispheres and Earth System Institute of Coastal Environmental Pollution Control Key Laboratory of Marine Environment and Ecology (Ministry of Education) Ocean University of China Qingdao 266100 China Laboratory for Marine Ecology and Environmental Science Qingdao Marine Science and Technology Center Qingdao 266237 China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing 100038 China Institute of Environmental Processes and Pollution Control and School of Environment & Ecology Jiangnan University Wuxi 214122 China Stockbridge School of Agriculture University of Massachusetts Amherst MA 01003 United States

Heteroaggregation is critical for the distribution, transport, and bioavailability of nanoplastics in aquatic environments, but the heteroaggregation of functionalized nanoplastics with Al 2 O 3 particles is unknown. In this work, strong heteroaggregation occurred between negatively charged nanoplastics (PS-plain and PS-COOH) and positively charged Al 2 O 3 particles at pH 6.0, and electrostatic attraction was identified as the dominant force. Weak heteroaggregation was also found for positively charged PS-NH 2 , in which hydrogen bonding and van der Waals force were the main mechanism based on molecular dynamics simulations and Fourier transform infrared analysis. Maximum heteroaggregation rates and hydrodynamic diameters of PS-Al 2 O 3 heteroaggregates were observed at the ratio of 0.005 (PS-COOH/Al 2 O 3 ), which could be explained by the minimum net charge of the heteroaggregates in the binary system and the specific heteroaggregate configurations (bridging). Additionally, the effect of humic acid (HA) on PS-Al 2 O 3 heteroaggregation under different interaction sequences was studied for the first time. Notably, pre-treated with HA on PS-COOH nanoplastics or Al 2 O 3 mitigated the heteroaggregation more obviously relative to coating HA on PS-Al 2 O 3 heteroaggregates ((Al 2 O 3 -PS-COOH)-HA). Pre-adsorbed HA weakened electrostatic interaction and enhanced steric interactions between PS-COOH and Al 2 O 3 . For the three nanoplastics, homoaggregation of Al 2 O 3 facilitated PS-Al 2 O 3 heteroaggregation under low ionic strength (below 50 mM NaCl) while this effect was not evident under high ionic strength conditions. Slight disturbance (e.g., shaking) was found to enhance the heteroaggregation between PS nanoplastics and Al 2 O 3 , while strong disturbance (e.g., sonication) could break down PS-Al 2 O 3 heteroaggregates irreversibly. These results are useful for better understanding the transport and fate of nanoplastics in the natural aquatic environments.

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Economic Optimal Dispatch of Grid-connected Microgrid Based on Improved Genetic Algorithm 2

Economic Optimal Dispatch of Grid-connected Microgrid Based ...

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2nd International Conference on Energy, Electrical and power Engineering, CEEPE 2019

作者： Sun, Li Zhao, Shujian Ma, Chenglian Chen, Naixin Yao, Tianliang Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Jilin132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin130021 China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun Jilin130000 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou730050 China

Nowadays, the demand for energy is expanding, the fossil resources are on the verge of exhaustion, and the ecological environment is getting worse and worse. In this form, this paper studies the economic optimal dispatch of microgrid under the background of energy saving and emission reduction. Firstly, the mathematical model of microgrid composed of distributed power, energy storage devices and loads is established. Secondly, under the background of energy saving and emission reduction, the objective function of multi-objective optimal operation of microgrid is established considering both economic and environmental aspects. Finally, the improved Genetic Algorithm is used to solve the objective function. The results of optimization can reduce microgrid system generation cost. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Genetic algorithms

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Voltage pole-wave protection scheme for multi-terminal DC grid

Voltage pole-wave protection scheme for multi-terminal DC gr...

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作者： Xie, Zhongrun Zou, Guibin Gao, Lei Zhang, Jie Gao, Houlei Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education School of Electrical Engineering Shandong University Ji'nan China State Grid Ji'nan Electric Power Company Ji'nan China

With the rapid development of flexible DC transmission and multi-terminal high voltage direct current transmission (HVDC) (MTDC) grid, the protection schemes of flexible DC transmission lines are still the traditional methods, which do not achieve the properties of fast and selective operation in the DC grid. In this study, using Zhangbei MTDC grid as the research object, the fast protection of DC transmission lines of MTDC grid has been studied. First, the voltage response characteristics of fault line and non-fault line at the boundary of DC lines are analysed. On the basis of this, using wavelet transform to extract the characteristic value of voltage pole-wave, this study put forward a high-speed non-unit protection criterion to identify the internal and external faults. In addition, two auxiliary criteria are constructed to identify lightning disturbance and faulted pole, respectively. Finally, a simulation model of Zhangbei MTDC grid is constructed, and the effectiveness of the proposed protection scheme is verified by extensive simulation results. © 2019 Institution of Engineering and *** right reserved.

关键词： Poles

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power grid frequency regulation participated by photovoltaic generation to adapt to different control modes of grid-side AGC

Power grid frequency regulation participated by photovoltaic...

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8th Renewable power Generation Conference (RPG 2019)

作者： Gangui Yan Wenbo Hu Qi Jia Dan Wang Guoqing Zhou Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Large-scale grid-connection of photovoltaic (PV) generation causes the power system to face the problem of insufficient inertia and insufficient frequency modulation capability. One of the important means to solve this problem is to take part in grid frequency regulation actively. On the basis of spare certain active power, this paper puts forward the active power-frequency droop control strategy. By modifying the original control structure of the inverter, PV generation actively takes part in the grid frequency primary regulation. In order to achieve non-error adjustment of frequency, this paper further proposes a secondary frequency regulation control strategy that adapts to different grid-side AGC control modes (constant frequency control mode, constant tie line power control mode and tie line power frequency deviation control mode). The effectiveness and feasibility of the control strategies are verified based on the PSCAD/EMTDC simulation platform.

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Optimal multi-time scale coordination method for electricity-heating integrated energy system scheduling

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IOP Conference Series: Earth and Environmental Science 2021年第1期645卷

作者： Zhuoran Lin Shouxiang Wang Shaomin Wang Aoyang Han Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Power System Simulation and Control Tianjin University Tianjin 300072 China State Grid Qingdao Electric Supply Company Qingdao Shandong 266000 China

Considering that different energy subsystems have different control characteristics in equipment operations, an optimal multi-time scale coordination method for electricity-heating integrated system scheduling is proposed. It merges three optimal scheduling models based on three-time scales of day-ahead, rolling, and real-time. The coordinated optimization of electricity and heating energies with the same dispatch instruction is fulfilled in day-ahead scheduling. And all feasible scheduling instruction cycles are traversed in the rolling stage to improve the stability of system economic operation. The calculation examples show that the proposed overall strategy for multi-time scale scheduling can achieve multi-energy complementarity, and the optimization results have less deviation from the actual load.

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Ultra-Short-Term Prediction of Wind power Based on Chaos Theory and ABC Optimized RBF Neural Network

Ultra-Short-Term Prediction of Wind Power Based on Chaos The...

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China International Electrical and Energy Conference (CIEEC)

作者： Yang Cui Shi Yan Huiquan Zhang Siyu Huang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Ji Lin China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

Wind energy has strong randomness and volatility, which makes the prediction accuracy of wind power low. In an attempt to improve the accuracy and robustness of ultra-short term prediction of wind power, a wind power prediction method in ultra-short term combining chaos theory and artificial bee colony(ABC) algorithm to optimize RBF neural network is studied in this paper. Firstly, based on chaos theory, the historical wind power data with the highest correlation is found, which is used for RBF neural network training after phase space reconstruction. Then, the artificial bee colony algorithm is used to solve the optimal RBF neural network parameters through multiple iterations to construct the optimized neural network model. Finally, considering the uncertainty of the prediction model and data noise, the prediction results are interval, and the robustness of the prediction results is evaluated by calculating the confidence of the corresponding interval. The results of the example show that the method proposed in this paper has good accuracy and robustness.

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A novel frequency regulation control strategy based on the external characteristics of PV generation

A novel frequency regulation control strategy based on the e...

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8th Renewable power Generation Conference (RPG 2019)

作者： Gangui Yan Dan Wang Qi Jia Wenbo Hu Guoqing Zhou Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Large-scale grid-connected PV generation results in the power system facing with the problem of reduced inertia and inadequate frequency regulation capability, which is urgent for PV generation to take participate in frequency regulation. In this paper, the research object is the double-stage PV generation, a novel frequency regulation control strategy based on the external characteristics of PV generation is proposed. f-U PV compensation is introduced into DC low-voltage control loop, which makes the DC low-voltage vary with the grid frequency, thus controlling the output power of PV generation. The influence mechanism of the control strategy on the frequency dynamic process of power system is also analysed based on the frequency response model (SFR). The results show that: the larger the ΔU PV generated by the f-U PV compensation unit, the more power of PV generation can be generated; the control strategy essentially affects the damping coefficient of the system, which not only affects the transient process of the system frequency, but also the steady-state frequency deviation.

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