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3rd International Conference on Environmental Prevention and Pollution control Technologies, EPPCT 2021

作者： Chen, Fan Liu, Zhiqing Qiu, Jifu Lu, Zhipeng Chen, Ming Niu, Qingda Dong, Xiaoming Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Shandong Province Jinan250061 China State Grid Shandong Electric Power Company Shandong Province Jinan250001 China Qingdao Electric Power Supply Company of State Grid Shandong Electric Power Company Shandong Province Qingdao266002 China

Renewable energy access will be an important trend in the development of the future power grid. In order to analyze the uncertainty brought by wind power access and improve the safety of the grid during steady-state operation, this paper models the uncertainty of wind power. An optimal power flow model considering the risk of power and voltage overruns is established. The model takes the optimal cost of power generation as the goal, takes into account the influence of transformer tap adjustment on system network parameters, and the constraint conditions take into account unit power and safety constraints, it is solved by the primal dual interior point method. The effectiveness of the model and algorithm proposed in this paper is verified by the IEEE14 test system. © Published under licence by IOP Publishing Ltd.

关键词： Wind power

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Multi-objective optimal siting and sizing of BESS considering transient frequency deviation and post-disturbance line overload

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2023年 144卷

作者： Cao, Yongji Wu, Qiuwei Zhang, Hengxu Li, Changgang Tech Univ Denmark Ctr Elect Power & Energy Dept Elect Engn DK-2800 Lyngby Denmark Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Tsinghua Shenzhen Int Grad Sch Shenzhen 518055 Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

With the development of renewable energy sources, more frequent and severe active power disturbances emerge in power systems, and jeopardize the frequency stability and line loading security. The battery energy storage system (BESS) is able to adjust output power flexibly, and an attractive solution to improve frequency dynamics and power flow distribution. This paper proposes a multi-objective optimal siting and sizing scheme for the BESS to arrest frequency excursion and mitigate line overload under major disturbances. First, an extended average system frequency model is developed to estimate the required transient frequency regulation capability (TFRC) for frequency stability, and the post-disturbance power flows. Then, taking the required TFRC and line capacity as constraints, a multi-objective optimization model is established to minimize the life cycle cost of the BESS and generation cost. Furthermore, based on the linear weighted method, big-M method, and multi-cut generalized Benders decomposition, the intractable optimization model is transformed into a master problem for investment decision making, and a set of subproblems accounting for normal operation, frequency stability and line loading security. Additionally, the master problem and subproblems are solved iteratively to determine the location and capacity of the BESS. Case studies are conducted to validate the proposed scheme, showing superior performance in improving frequency nadir and alleviating post-disturbance line overload.

关键词： Average system frequency model Battery energy storage system Frequency stability Line overload

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Distributed Online Voltage control for Wind Farms Using Generalized Fast Dual Ascent

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IEEE TRANSACTIONS ON power systemS 2020年第6期35卷 4505-4517页

作者： Guo, Yifei Gao, Houlei Wang, Zhaoyu Iowa State Univ Dept Elect & Comp Engn Ames IA 50011 USA Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

This paper considers the voltage control problem in wind farms, with the goals of maintaining feasible voltage profile and adequate reactive power (VAR) reserves by coordinating the reactive power outputs of wind turbines (WTs) and static synchronous compensators (STATCOMs). Rather than a conventional centralized and offline fashion, we propose a distributed online voltage control scheme based on dual decomposition. First, the optimal voltage control problem is formulated based on the branch flow model. Then, thanks to the sparsity of the constraints in this problem, a distributed solution framework is developed based on the dual decomposition and its online implementation is achieved through voltage feedback. To pursue fast convergence of the distributed algorithm and consequently facilitate the online implementation, the fast gradient method is generalized and then applied to solve the dual problem. The effectiveness of the proposed voltage control scheme is numerically validated under both static and dynamic cases.

关键词： Reactive power Wind farms Convergence Voltage measurement Automatic voltage control Wind turbines Dual ascent (DA) distributed control reactive power (VAR) voltage control wind turbine (WT) wind farm

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Operation and control of MMC station with constraints of internal variables under unbalanced grid conditions

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IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第10期14卷 1829-1841页

作者： Hao, Quanrui Li, Dong Li, Bowei Wang, Shuying Shandong Univ Dept Elect Engn Minist Educ Key Lab Power Syst Intelligent Dispatch & Control 17923 Jingshi Rd Jinan Peoples R China State Grid Jinan Power Supply Co Jinan Peoples R China

Modular multilevel converter (MMC) station is expected to be able to operate under unbalanced grid conditions (UGCs) and to satisfy all kinds of limits under UGC. To investigate the allowable region of MMC under UGC, this study presents a point-scanning method, which directly solves the steady-state values of MMC from non-linear dynamic equations for each possible operating point, and therefore, can access the constraints of internal variables including the sub-module capacitor voltage, arm current and modulation index. First, the complete 28th-order dynamic model of MMC, which contains the zero-sequence second-order modulation signal is derived. Next, as the premise to solve the steady state of MMC, point of common coupling voltages are solved from a proposed unbalanced grid model, which incorporates the effect of ac fault. Following that, a peak-value seeking algorithm is proposed to seek the peak values of internal dynamics of irregular waveforms to implement the constraint of internal dynamics. Next, the allowable region of MMC under UGC is depicted and analysed. Also, the power limiting control is proposed to avoid MMC under UGC, violating the limits of internal dynamics. Finally, the simulation validates the effectiveness and correctness of the proposed point-scanning method and power limiting control.

关键词： power grids HVDC power convertors MMC station internal variables unbalanced grid conditions modular multilevel converter station UGC allowable region point-scanning method steady-state values nonlinear dynamic equations operating point modulation index complete 28th-order dynamic model unbalanced grid model internal dynamics power limiting control

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A Wavenumber Domain Reflectometry Approach to Locate and Image Line-Like Soft Faults in Cables

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2023年 72卷 1页

作者： Chen, Chuanxu Guan, Quansheng Guan, Quanxue Jin, Xin Shi, Zhan South China Univ Technol Sch Elect & Informat Engn Guangzhou 510640 Peoples R China Sun Yat Sen Univ Sch Intelligent Syst Engn Guangzhou 510220 Peoples R China China Southern Power Grid Co Ltd Elect Power Res Inst Guangzhou 510700 Peoples R China Guangdong Prov Key Lab Intelligent Measurement & A Guangzhou 510663 Peoples R China Guangdong Power Grid Co Ltd Elect Power Dispatch & Control Ctr Guangzhou 510030 Peoples R China

Soft fault detection for cables is of great significance to secure modern power system since the soft fault will gradually develop into a hard fault or electrical fire. The existing detection methods often apply to localize point-like faults, while most soft faults are line-like faults with a certain length. Considering that soft faults will change the signal propagation speed, this article establishes a transmission line model with respect to speed distribution. Then, a wavenumber domain reflectometry (WDR) is developed to obtain the speed distribution using the Volterra inverse scattering series (VISS). By dealing with zero wavenumber compensation and Gibbs ringing artifact suppression issues of VISS in the wavenumber domain, WDR achieves not only localization but also dielectric permittivity imagination for line-like faults without the need for time synchronization and the knowledge of line topology. Both simulations and experiments are carried out to study the localization and imagination of WDR. The results show that WDR locates the range of line-like faults more precisely than the existing fault detection methods, and achieves dielectric permittivity imagination with an accuracy larger than 97%.

关键词： Cables characteristic imagination inverse scattering series (ISS) soft fault localization speed perturbation

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Time-Process power Flow Calculation Considering Thermal Behavior of Transmission Components

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IEEE TRANSACTIONS ON power systemS 2020年第6期35卷 4232-4250页

作者： Zhou, Shengyuan Wang, Mengxia Wang, Jianhui Yang, Ming Dong, Xiaoming Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Southern Methodist Univ Dept Elect & Comp Engn Dallas TX 75205 USA

The conductor temperature is a critical state variable that should be considered in power flow calculations to improve the calculation accuracy and reveal the potential thermal loadability of transmission components. This paper proposes a calculation method for time-process power flow considering the thermal behavior (TPPFCTB) of transmission components to calculate the temperature dynamics of overhead lines, power cables, and transformers under anticipated system operation scenarios. The TPPFCTB model is represented by differential-algebraic equations, which can be solved as a sequence of extended power flow problems at discretization time intervals. Based on the Newton method, incomplete and complete decoupling methods are proposed to decouple the correction equations into several independent groups with constant coefficient matrices, thus improving computational efficiency. The work presented in this paper provides an effective method for the detection of potential power transfer capability problems associated with transmission components, thus guiding operators to make more economical decisions. Numerical simulations were conducted to verify the effectiveness of the proposed method.

关键词： Mathematical model power cables Conductors Oil insulation power transformer insulation Load flow Thermal conductivity Heat balance equation power flow calculation power system transmission component thermal behavior

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Study on Online dispatching Defensive Strategy for power Grid Considering Expected Circuit Breaker Fault Set

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ELECTRIC power systemS RESEARCH 2022年 203卷 107640-107640页

作者： Deng, Xiangli Wang, Wei Liao, Yuelin Zhang, Qianbo Liu, Shiming Wang, Chuanqi Shanghai Univ Elect Power Sch Elect Engn Shanghai 200090 Peoples R China Minist Educ Key Lab Control Power Transmiss & Convers SJTU Shanghai 200240 Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Shandong Peoples R China Tianjin Keyvia Elect Co Ltd Tianjin 300392 Peoples R China

In order to prevent serious blackouts caused by cascading faults, a defense strategy which considers the expected circuit breaker fault set is proposed for online despatching that is applied to power grid protection. In this paper, the multi-stage game model has been established to study the online defense strategy of circuit breaker failure from the perspective of attacker and defender. From the perspective of attacker in the power grid, the initial expected fault set based on the circuit breaker defect prediction is taken as the initial action. Considering the two factors that the removal of the power flow transfer branch and the incorrect operation of the zone III distance protection because of hidden fault. Then, a strategic space for the attacker is formed by using the risk theory predict the operation of power grid. From the perspective of the defender, a method for adjusting the power system using sensitivity control and adaptive adjustment of the backup protection setting is proposed. The paper finds the optimal strategy for both parties through defining the profit function. Finally, the IEEE 39-bus system is taken as an example to analyze the model, and the simulation results verify the feasibility of the article model.

关键词： Familial defects Circuit breaker failure Cascading failures Risk assessment Multi -stage game Defense strategy

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Event-driven Fast Frequency Response Based on Fuzzy Logic controller 3

Event-driven Fast Frequency Response Based on Fuzzy Logic Co...

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3rd IEEE International Conference on Automation, Electronics and Electrical Engineering, AUTEEE 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Li, Chen Guo, Qi Zhu, Yihua Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China Electric Power Research Institute China Southern Power Grid Power System Simulation and Control Technology Research Department Guangzhou China

ISBN: (纸本)9781728198279

The increasing penetration of renewable energy sources (RESs) brings about critical challenges on power system frequency stability. More specially, the RESs are integrated into power systems through electronic converters, and provide less inertia to counter frequency deviations after contingencies. This paper proposes an event-driven fast frequency response (EFFR) approach based on fuzzy logic controller (FLC), in order to improve the frequency control under serious contingencies. An event-driven control framework is established, in which the contingencies and corresponding disturbance power are monitored. And once the specific contingencies are detected, the EFFR scheme will be actuated rapidly. Then, the FLC is employed to attain the control commands for EFFR, which are the required extra power of controlled units. Using the disturbance power and frequency deviation as input variables, the FLC can consider both the occurred contingencies and current power system states simultaneously. A case study is carried out to verify the feasibility and effectiveness of the proposed approach. © 2020 IEEE.

关键词： Frequency response

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Improved Comprehensive Inertial control for ESS Participating Primary Frequency Regulation Based on Fuzzy control 5

Improved Comprehensive Inertial Control for ESS Participatin...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Xiang, Yongjian Xu, Yunhui Zhou, Tao Dai, Zhongjian Ren, Bixing Zhang, Lei Nanjing University of Science and Technology School of Automation Nanjing China State Grid Lishui Power Supply Company Substation Operation Inspection Center Lishui China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid Changzhou Power Supply Company Operation and Maintenance Department Changzhou China Jiangsu Electric Power Test Research Institute Co. Ltd. Nanjing China China Classification Society Product Plan Approval Center Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

ESS (energy storage system) has many advantages such as flexible control, large throughput capacity and fast response speed and can provide strong support for system frequency stability with larger-scale renewable energy. In order to enhance the frequency regulation effect of ESS, this paper proposes an improved comprehensive inertia control strategy based on FC (fuzzy control). The conventional droop control is replaced by fuzzy control to improve the regulation performance and adaptivity of the whole process. SOC (state of charge) is adopted as the input of FC to consider the secure and stable constraints of ESS. In addition, FC is also applied to adjust the virtual inertia coefficients online. The proposed strategy combines the advantages of comprehensive inertial control and adaptive control and improve the frequency supporting ability of ESS under different operation conditions. Finally, simulations are conducted to demonstrate the feasibility of the proposed method. © 2022 IEEE.

关键词： Fuzzy control

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Formulation of Fault Characteristics Based on Model Reduction in High Penetration Electronics system

Formulation of Fault Characteristics Based on Model Reductio...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Jiyao Han Zhuan Zhou Qichao Chen Fei Wang Xiaohui Wang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan China State Grid Xinjiang Electric Power Co. Ltd Urumqi China State Grid Economic and Technological Research Institute CO. Ltd State Grid Corporation of China Bejing China

In the power grid, with the extensive applications of power electronic equipment, the dimension and complexity of the power system model are greatly increased. Compared with the traditional power grid, the number of components in the high proportion electronic power grid system is large and the interactions between them are complex. In case of fault, it is necessary to comprehensively consider state variables. To solve the above problems, a fault feature extraction method based on balanced truncation model reduction algorithm is proposed, and the feasibility of the fault feature extraction is verified by time-domain simulation in a photovoltaic grid connected system model. This method aims to recombine the original variables into a group of new independent comprehensive variables, and then take out a few comprehensive variables according to the actual needs to reflect the fault information in the original system as much as possible.

关键词： Linear systems Photovoltaic systems Electrical engineering Spontaneous emission Feature extraction Reduced order systems power grids

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