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2023 International Conference on power System Technology, powerCon 2023

作者： Li, Zhi Wang, Yuanyuan Su, Xinyan Ji, Xiangzhen Bao, Guannan Si, Juncheng Zhang, Li State Grid Shandong Electric Power Company Power Dispatching Control Center Jinan China Dongying Power Supply Company State Grid Shandong Electric Power Company Dongying China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9798350300222

The diversity of power supply structure increases the diversity of power generation resources, but it also brings the problem of how to correctly understand the value of power supply. In particular, to implement the carbon peaking and carbon neutrality goals, not only the power generation cost but also its carbon reduction effect should be considered in the value of power generation resources. In view of the conversion of wind-coal value, this paper refers to the concept of the water-coal conversion coefficient, proposes the wind-coal value conversion coefficient, and establishes its analysis method, so as to realize the reasonable evaluation of the value of wind power and coal power in new power system dispatching. Based on the analysis of the technical characteristics of wind power generation, the prediction error of wind power was modeled using the scenario generation method, and carbon cost and green certificate revenue were introduced to construct a multi-scenario stochastic planning and scheduling model with the minimum total cost of electricity purchase. The model was solved based on the KKT condition, and the explicit expression of the wind-coal value conversion coefficient was derived by the Lagrange multiplier. Finally, a 4-unit system is taken as an example to verify that the proposed wind-coal value conversion coefficient can realize the equivalent value evaluation of wind coal, and the influence of the inequality constraint reaching the limit on the wind-coal value conversion coefficient is further discussed. © 2023 IEEE.

关键词： Coal

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Analysis of the near-fundamental-frequency oscillation in an actual renewable energy system transmitted through MTDC grid 12

Analysis of the near-fundamental-frequency oscillation in an...

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12th International Conference on Renewable power Generation, RPG 2023

作者： Xie, Pingping Yang, Yinguo Li, Li Lu, Qiuyu Zhang, Fan Zhou, Baorong Guangdong Power Grid Power Dispatching Control Center Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China

Near-fundamental-frequency oscillation (NFFO) events were observed in a renewable energy system (RES) connected to a four-terminal direct current (MTDC) grid in China, which has the world's largest DC transmission network. The sending terminal of the MTDC grid includes various converter-interfaced generators, such as permanent magnetic synchronous generator (PMSG), doubly-fed induction generator (DFIG), and photovoltaic (PV). The oscillation phenomenon is unique since the NFFO frequencies of 44 Hz and 56 Hz are relatively close to the fundamental frequency. For the first time, field-measured data are employed to investigate the oscillation characteristics. The analysis indicates that a resonance circuit (RLC) exists between the wind farm and the MTDC, and the wind farms display negative resistance at the oscillation frequencies. Further investigations identify the oscillation source based on the distribution of power flow at the oscillation frequencies. The paper also explores potential causes and countermeasures for the observed phenomena. © The Institution of Engineering & Technology 2023.

关键词： Electric power transmission networks

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Robust control of Bidirectional power Converter in an AC/DC Hybrid Microgrid Based on the H∞Tracking Problem 4

Robust Control of Bidirectional Power Converter in an AC/DC ...

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4th International Conference on power and Energy Technology, ICPET 2022

作者： Guo, Tianyu Guo, Haiping Luo, Chao Miao, Lu Huang, Libin State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China China Southern Power Grid Csg Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China Electric Power Dispatching and Control Center of Guangdong Power Grid Guangzhou China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

The bidirectional power converter (BPC) in the ac/dc hybrid microgrid plays a vital role in maintaining the dynamic balance of power in the microgrid, achieving mutual support of power between the AC and the DC areas, and improving the power quality. In view of this, this paper proposes a robust control method for BPC in the ac/dc hybrid microgrid based on the H∞ tracking problem. First, based on the superposition theorem, the voltage control problem of the ac/dc hybrid microgrid is converted into a H∞ tracking problem for solution, and the robust controller is mathematically proved to exist stably. Then, the designed H∞ robust controller is reduced based on the principle of optimal Hankel norm approximation reduction. Finally, the simulation model is built based on the MATLAB/Simulink to verify the correctness and effectiveness of the proposed method. © 2022 IEEE.

关键词： Robust control

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Research on the Mechanism and Evaluation Method of DC Side Harmonic Oscillation of LCC HVDC System

Research on the Mechanism and Evaluation Method of DC Side H...

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2023 International Conference on power Energy Systems and Applications, ICoPESA 2023

作者： Su, Yinsheng Xin, Qingming Cao, Rinbin Xie, Huifan Liu, Hongtao Zhao, Xiaobin Guo, Long Qin, Kang China Southern Power Grid Power Dispatching Control Center China China Southern Power Grid State Key Laboratory of Hvdc Electric Power Research Institute Guangzhou China

ISBN: (纸本)9798350345605

With the wide application of HVDC system, the harmonic oscillation occurs from time to time, and even leads to bipolar blocked, which affects the safe and stable operation of HVDC system. The mechanism of harmonic oscillation on DC side of LCC HVDC system is analyzed in this paper, and comprehensive impedance calculation method including main circuit impedance and control system impedance is proposed. The influence of the triggering mechanism of converter valve on the impedance characteristics of control system is studied, and harmonic oscillation evaluation method based on comprehensive impedance is proposed. The method is verified by simulation and actual project. © 2023 IEEE.

关键词： control systems

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Carbon Cost Pass-Through Analysis Considering Green Certificate Trading 8

Carbon Cost Pass-Through Analysis Considering Green Certific...

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8th Asia Conference on power and Electrical Engineering, ACPEE 2023

作者： Zhou, Lei Zhang, Guoqiang Liu, Hanghang Wang, Yuanyuan Su, Xinyan Lv, Fenglei State Grid Shandong Electric Power Company Power Dispatching Control Center Jinan China State Grid Shandong Electric Power Company Dongying Power Supply Company Dongying China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9798350345520

The optimal allocation of resources through the synergy of the electricity market, carbon emission market, and green certificate market is the necessary way for the development of the new power system with a high proportion of renewable energy. The impact of the carbon market on the electricity market is reflected by the carbon cost pass-through analysis. However, the mechanism of the green certificate market on carbon cost pass-through has not received due attention. In view of this situation, based on the establishment of the carbon cost pass-through analysis method, this paper further analyzes the coupling impact of green certificate trading and carbon emission trading. The energy-reserve joint optimization market trading model considering the equivalence relationship between green certificate trading and carbon emission trading was constructed, and the carbon cost pass-through rate was obtained based on weighted market simulation results. The effectiveness of the proposed method is verified by the simulation of a 10-unit system, and the influence of the price of green certificates on the cost pass-through rate is analyzed. © 2023 IEEE.

关键词： power markets

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Research on modeling and simulation technology for wind power generator in power system: A survey

Research on modeling and simulation technology for wind powe...

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Su, Yin Sheng Zeng, Yuan Li, Peng Li, Zhi Huan Electric Power Dispatching Control Center China Southern Power Grid Guangzhou China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9783038351948

Features of different kinds of wind power generators worldwide are firstly overviewed. Then the latest development trend and research progress of modeling and simulation for wind power generator are analyzed and compared. Finally, the developing directions of the modeling and simulation technology for wind power generator are presented, hoping to offer study idea and reference for deeply researches. © (2014) Trans Tech Publications, Switzerland.

关键词： Surveys

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Transient voltage stability margin prediction method based on lightgbm 4

Transient voltage stability margin prediction method based o...

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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Jie, Zhang Binjiang, Hu Qi, Guo Yihua, Zhu Zhiyuan, Sun Mingpo, Li Yan, Sun Electric Power Research Institute CSG State Key Laboratory of HVDC China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China CSG Key Laboratory of Power System Simulation Guangzhou China Guangxi Power Grid Electrical Power Research Institute Nanning China Guangxi Power Grid Dispatching Control Center Nanning China

ISBN: (纸本)9781665415965

Traditional time-domain simulation method has long calculation time on transient voltage stability margin prediction problem, the direct method is difficult to adapt to the complex power grid model, and the deep neural network method requires a large data set. In this paper, we propose the method based on LightGBM, which has the advantages of appropriate model complexity and less training time demand. Based on a regional subsystem of Guangxi power grid with more electrolytic aluminum load, and a power system transient voltage stability margin prediction model based on LightGBM is constructed. To solve the long tail distribution learning problem, target clipping and log transformation techniques are proposed to enhance the model. The effectiveness of them is verified by experiment results. And we propose a new metric, partial RMSE, to evaluate the performance of the model fitting the instability data. The experiment results also show that it has achieved better performance and training time than other machine learning models. © 2021 IEEE.

关键词： Forecasting

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Peak shaving market mechanism of captive power plants considering energy consumption characteristics of enterprises

Peak shaving market mechanism of captive power plants consid...

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2021 International Conference on power System Technology, powerCON 2021

作者： Liu, Hanghang You, Daning Cai, Yanbin Zhang, Guoqiang Wang, Hao Zhang, Li State Grid Shandong Electric Power Company Dongying Power Supply Company Dongying China State Grid Shandong Electric Power Company Power Dispatching Control Center Jinan China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9781665407373

The continuously increased renewable energy has brought tremendous pressure to the operation of power system. To enhance dispatching flexibility, it is necessary to build peak shaving market and include captive power plants in the transaction. Considering the peculiarity of captive power plants, a mechanism of captive power plants to participate in peak shaving auxiliary services market is proposed, in which the captive power plant must meet the enterprise's own demand for steam and heat when it takes part in market bidding and clearing. The mechanism is established on the basis of the provincial spot market, emphases are focused on declaration and settlement rules. Case studies show that the mechanism can make the captive power plant play its peak shaving role without affecting the production of the enterprise. Thus, the mechanism is practicable and promising in promoting the consumption of renewable energy. © 2021 IEEE.

关键词： Energy utilization

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Probabilistic production simulation of a power system with wind power penetration based on improved UGF techniques

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Journal of Modern power Systems and Clean Energy 2013年第2期1卷 186-194页

作者： Hongtao WANG Xu LIU Chunyi WANG Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China State Grid Zhejiang Electric Power Company Jiaxing Power Supply CompanyJiaxing 314001China State Grid Shandong Electric Power Company Jinan 250001China

Universal Generating Function(UGF)techniques have been applied to Multi-State System(MSS)reliability analysis,such as long term reserve expansion of power systems with high wind power ***,using simple steady-state distribution models for wind power and large generating units in reliability assessment can yield pessimistic *** more accurately assess the power system reliability,UGF techniques are extended to dynamic probabilistic simulation analysis on two aspects of modelling ***,a principal component analysis(PCA)combined with a hierarchal clustering algorithm is used to achieve the salient and time-varying patterns of wind power,then a sequential UGF equivalent model of wind power output is established by an apportioning ***,other than the traditional two-state models,the conventional generator UGF equivalent model is established as a four discrete-state continuous-time Markov model by *** the construction process of such a UGF model,the state values are transformed into the integral multiples of one common factor by choosing proper common factors,thus effectively restraining the exponential growth of its state number and alleviating the explosion *** method is suitable for reliability assessment with dynamic probabilistic distributed random *** addition,by acquiring the clustering information of wind power,the system reliability indices,such as fuel cost and CO_(2) emissions through different seasons and on different workdays,are ***,the effectiveness of the method is verified by a modified IEEE-RTS 79 system integrated with several wind farms of historical hourly wind power data of Zhangbei wind farm in North China.

关键词： Multi-state system Reliability Universal Generating Function(UGF) Probabilistic production simulation Wind power

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Evaluation of Parameter-free Fault Location Algorithm for Distribution Network Three-terminal Transmission Lines

Evaluation of Parameter-free Fault Location Algorithm for Di...

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2020 IEEE/IAS Industrial and Commercial power System Asia, I and CPS Asia 2020

作者： Liu, Shu Wang, Chengbin Gu, Liqiang State Grid Shanghai Electric Power Research Institute Shanghai China Shandong University Key Laboratory of Ministry of Education Intelligent Dispatching and Control of Power Grid Jinan China State Grid Shanghai Pudong Electric Power Supply Company Shanghai China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143033

Three-terminal transmission line is an important approach for the integration of distributed generation and the power supply of small loads in the distribution network. However, inaccurate or unknown line parameters can cause great errors in the results of most existing phasor-based fault location algorithms for this kind of line. Recently, one paper proposes a fault location algorithm without line parameter values, utilizing the post-fault measurements of three terminals. For the hypothetical fault on each section, because voltages at fault point respectively derived by three-terminal measurements should be equal, corresponding fault location equations involving the fault distance and line parameters as unknowns can be established. In addition, the redundancy of equations is enhanced using multiple groups of sampling data to reduce the influence of measurement error on the location result. Then, each equation set can be solved by the trust-region algorithm respectively. Finally, the fault point is located because the solution of equations is correct on condition that the actual fault point is on the assumed faulty section. In this paper, the above algorithm is evaluated under various fault position, fault resistances, fault types and usual measurement error, using Simulink and power system dynamic lab respectively. © 2020 IEEE.

关键词： Electric fault location

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