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2023 International Conference on power System Technology, powerCon 2023

作者： Wen, Tao Tu, Qingrui Liu, Wei Wang, Wenbo Bu, Ningjing He, Jiawei Guangdong Power Grid Electric Power Dispatching Control Center Guangzhou China Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China

ISBN: (纸本)9798350300222

Flexible DC transmission systems can renewable energy consumption and improve power supply reliability. However, the control response and topology of flexible DC converter leads to a different fault output from conventional synchronous generator. Based on topology and control strategy, the controller response of flexible DC converter after AC fault is analyzed, and the equivalence of converter is proposed from the view of sequence component. The results show that positive-sequence equivalence is a current source, and its output satisfies the second order non-flush differential equation and is over-damped. Negative-sequence equivalence is an open circuit under suppression strategy. Zero-sequence equivalence is determined by grounding scheme of transformer windings and is not affected by control strategy. © 2023 IEEE.

关键词： Topology

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Equivalent Value Evaluation of Wind Coal Based on Multi-Scenario Stochastic Programming

Equivalent Value Evaluation of Wind Coal Based on Multi-Scen...

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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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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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Emergency control methods for power systems based on improved deep reinforcement learning 6

Emergency control methods for power systems based on improve...

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2024 6th International Conference on Artificial Intelligence Technologies and Applications, ICAITA 2024

作者： Zhang, Jie Zhu, Yihua Liang, Zhuohang Ma, Qinfeng Zhang, Qingqing Liu, Mingshun An, Su Pu, Qingxin Dai, Jiang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangdong Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangdong Guangzhou510663 China Power Dispatching and Control Center of Guizhou Power Grid Co. Ltd. Guizhou Guiyang550000 China

In order to achieve fast and accurate transient stability analysis and emergency control, this paper proposes a transient stability emergency control method based on improved deep reinforcement learning. In order to fully explore the temporal and spatial variation trend of transient response, a multi-dimensional feature containing information such as transient situation energy is constructed, and the deep reinforcement learning model is transformed based on the time-space graph neural network. On this basis, an emergency control model is constructed, and the power grid knowledge is integrated into the emergency control decision-making scheme to reduce the exploration of invalid decision-making and improve the performance of the model. The effectiveness of the proposed method is verified in the IEEE-39 system. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Deep reinforcement learning

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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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Adaptive Model Predictive control for Servo Motor within High-Voltage Circuit Breaker 19th

Adaptive Model Predictive Control for Servo Motor within Hig...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Su, Yi Gao, Lei Lu, Yufeng Li, Baofeng Huang, Wei Rao, Xiajin Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China

ISBN: (纸本)9789819608966

This paper addresses a servo control technology that uses a permanent magnet synchronous motor (PMSM) to drive the high-voltage circuit breaker. In order to guarantee that the motion of high-voltage circuit breaker’s contacts is not affected by the uncertainties of the PMSM model, an adaptive model predictive control method is developed. In the proposed adaptive model predictive control method, a current predictive model is designed to estimate the currents at the next control cycle, and the deadbeat current predictive control of PMSM is achieved;the adaptive law is employed to compensate the effects resulting from the parameter uncertainties, where the cost function is chosen to reduce the error between the reference signals and the predicted current. The results explain that the proposed method has suppressed the influence of motor parameter mismatch due to the parameter uncertainties, and improve dynamic tracking and robustness. © Beijing Paike Culture Commu. Co., Ltd. 2025.

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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6th International Conference on power and Energy Technology, ICPET 2024

作者： Mu, Rui Li, Yan Wen, Tao He, Jiawei Zhou, Bohao Cao, Runbin Key Laboratory of Smart Gird of Ministry of Education Tianjin University Tianjin China Electric Power Research Institute China Southern Power Grid Guangzhou China Electric Power Dispatching Control Center Guangdong Power Grid Guangzhou China

ISBN: (纸本)9798350375855

With the high proportion of Photovoltaic (PV) power sources connected to the distribution networks, the distribution network becomes a complex network with multiple power supplies, and the reverse-feeding effect of PV sources can lead to reverse maloperation of generally configured current protection. Therefore, the direction criterion is introduced to solve this problem. However, the traditional power direction criterion has the problem of maloperation under the influence of PV equivalent impedance. Therefore, this paper deduces the fault equivalent impedance of PV sources, and clarifies the influence mechanism of PV sources on the traditional power direction criterion. Then, based on the cosine similarity characteristics of the positive sequence voltage and current at protection installation, a fast direction protection method based on single terminal quantity is proposed. Finally, simulation cases based on PSCAD/EMTDC simulation platform are carried out to fully demonstrate the effectiveness of the proposed method and its superiority over the traditional power direction criterion. © 2024 IEEE.

关键词： power distribution networks

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Active potential mining of day-ahead invitation demand response for industrial conveying loads

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JOURNAL OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2025年

作者： Cai, Xinlei Pan, Tingzhe Yu, Zhenfan Jin, Xin Hou, Jue Cao, Wangzhang Wang, Qin Guangdong Power Grid Co Ltd Power Dispatching Control Ctr Guangzhou 510335 Peoples R China CSG Elect Power Res Inst Guangzhou Peoples R China Guangdong Prov Key Lab Intelligent Measurement & A Guangzhou Peoples R China

Aiming at industrial loads with high flexibility, such as material conveying processes, an active potential mining method for day-ahead invitation demand response is studied through optimization. Under the day-ahead invitation demand response mechanism, an aggregation method for industrial conveying loads and an active potential mining framework for load aggregators participating in demand response are proposed. The demand response potential mining of the conveying load aggregators is formulated as optimization problems. Through the constructions of publishment functions attaching to demand response period, a potential mining model for day-ahead invitation demand response and an integrated potential mining model capable to response to day-ahead invitation demand and time-of-use tariff simultaneously are built, respectively. A cement clinker conveying system is taken as the study case to verify the demand response active potential mining models under multi-operating conditions. The results show that the proposed active potential mining models can actively participate in day-ahead invitation demand response and obtain the maximum potential, meanwhile, satisfy all the production requirements and safety constraints. The models can be references for highly flexible industrial loads to participate in demand response.

关键词： industrial loads with high flexibility day-ahead invitation demand response material conveying demand response potential mining cement clinker conveying system

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