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CSEE Journal of power and Energy Systems 2022年第3期8卷 710-720页

作者： Lin Yu Huadong Sun Shiyun Xu Bing Zhao Jian Zhang State Key Laboratory of power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing100192China

The power system is experiencing a higher penetration of renewable energy generations(REGs).The short circuit ratio(SCR)and the grid impedance ratio(GIR)are two indices to quantify the system strength of the power system with REGs.In this paper,the critical short circuit ratio(CSCR)is defined as the corresponding SCR when the system voltage is in the critical stable state.Through static voltage stability analysis,the mathematical expression of the CSCR considering the impact of GIR is derived.The maximum value of CSCR is adopted as the critical value to distinguish the weak power system.Based on the static equivalent circuit analysis,it is proved that the CSCR is still effective to evaluate critical system strength considering the interactive impact among REGs.Finally,we find that the GIR can be neglected and the SCR can be used individually to evaluate the system strength when SCR>2 or GIR>5.The correctness and rationality of the CSCR and its critical value are validated on ADPSS.

关键词： Critical short circuit ratio critical value grid impedance ratio maximum power transfer theorem static equivalent circuit analysis

Control Method for Additional Damper in Hydro-turbine Speed Governor of Hydro-dominant power Systems

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CSEE Journal of power and Energy Systems 2023年第2期9卷 589-598页

作者： Guanhong Wang Yong Tang Ying Li Dongping Ai Gang Chen Wei Wei Department of power System China Electric Power Research InstituteBeijing 100192China Department of power System Technology State Grid Sichuan Electric Power Research InstituteChengdu 610072China

With the rapid development of the national interconnected power grid,fast automatic excitation regulators and fast turbine governors are being widely used.In the current systems,some power plants adjust their responses for turbine governor systems to a very sensitive level to meet the primary frequency regulation assessment index,which actively brings about negative damping.Under these circumstances,the ultralow frequency oscillation(ULFO)phenomenon emerged in hydrodominant power systems.In order to solve the problem of ULFO,the hydro-turbine governor additional damper(GAD)based on phase compensation,which adapts to ULFO,is developed.The design of the control system is relatively simple.As a phase compensation based on the field testing and modeling of the turbine governor,GAD can provide the power system with positive damping,which contributes to the stability and security of the system.According to the impact of the mechanism of the turbine governor on the dynamic stability of the power system and the research of modeling and parametric testing,the proposed method not only supports positive damping,but also eliminates the negative damping of the speed governing system,which can significantly suppress the ultralow frequency oscillation and make it feasible to configure the GAD parameters according to field testing.

关键词： Governor additional damper phase compensation power system ULFO

Damping Characteristic Analysis and Optimization of Wind-thermal-bundled power Transmission by LCC-HVDC Systems

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Journal of Modern power Systems and Clean Energy 2024年第1期12卷 299-312页

作者： Liwen Zheng Shiying Ma the power System Department China Electric Power Research InstituteBeijing 100192China

With the rapid development of renewable energy,wind-thermal-bundled power transmission by line-commutated converter based high-voltage direct current(LCC-HVDC)systems has been widely developed.The dynamic interaction mechanisms among permanent magnet synchronous generators(PMSGs),synchronous generators(SGs),and LCC-HVDC system become complex.To deal with this issue,a path analysis method(PAM)is proposed to study the dynamic interaction mechanism,and the damping reconstruction is used to analyze the damping characteristic of the system.First,based on the modular modeling,linearized models for the PMSG subsystem,the LCC-HVDC subsystem,and the SG subsystem are established.Second,based on the closed-loop transfer function diagram of the system,the disturbance transfer path and coupling relationship among subsystems are analyzed by the PAM,and the damping characteristic analysis of the SG-dominated oscillation mode is studied based on the damping reconstruction.Compared with the PAM,the small-signal model of the system is obtained and eigenvalue analysis results are presented.Then,the effect of the control parameters on the damping characteristic is analyzed and the conclusions are verified by time-domain simulations.Finally,the penalty functions of the oscillation modes and decay modes are taken as the objective function,and an optimization strategy based on the Monte Carlo method is proposed to solve the parameter optimization problem.Numerical simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Wind-thermal-bundled power transmission line-commutated converter based high-voltage direct current(LCC-HVDC) path analysis method(PAM) damping characteristic analysis Monte Carlo method

Distributed Robust Optimal Dispatch for the Microgrid Considering Output Correlation between Wind and Photovoltaic

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Energy Engineering 2023年第8期120卷 1775-1801页

作者： Ming Li Cairen Furifu Chengyang Ge Yunping Zheng Shunfu Lin Ronghui Liu New power SystemTechnology research institute Electric Power Research InstituteThe Electric Power Research Institute of State Grid Xinjiang Electric Power Co.Ltd.Urumqi830000China The College of electrical Engineering Shanghai University of Electric PowerShanghai200090China

As an effective carrier of integrated clean energy,the microgrid has attracted wide attention.The randomness of renewable energies such as wind and solar power output brings a significant cost and impact on the economics and reliability of microgrids.This paper proposes an optimization scheme based on the distributionally robust optimization(DRO)model for a microgrid considering solar-wind correlation.Firstly,scenarios of wind and solar power output scenarios are generated based on non-parametric kernel density estimation and the Frank-Copula function;then the generated scenario results are reduced by K-means clustering;finally,the probability confidence interval of scenario distribution is constrained by 1-norm and∞-norm.The model is solved by a column-and-constraint generation algorithm.Experimental studies are conducted on a microgrid system in Jiangsu,China and the obtained scheduling solution turned out to be superior under wind and solar power uncertainties,which verifies the effectiveness of the proposed DRO model.

关键词： Microgrid uncertainty distributionally robust optimization Frank-Copula function scenario generation and reduction

Collaborative Fault Recovery and Network Reconstruction Method for Cyber-physical-systems Based on Double Layer Optimization

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CSEE Journal of power and Energy Systems 2023年第1期9卷 380-392页

作者： Wanxing Sheng Keyan Liu Zhao Li Xueshun Ye China Electric Power Research Institute Beijing 100192China

For fault characteristics of cyber-physical-systems(CPS)based distribution network,a spatiotemporal incidence matrix to represent correlation of concurrent faults on cyberspace and physical space is proposed,and strategies of fault location,removal,and recovery of concurrent faults are analyzed in this paper.Considering the multiple objectives of minimum network loss,voltage deviation,and switching operation times,a collaborative power supply restoration model of a CPS-based distribution network with the strategy that restoration of the communication layer is prior to the physical layer is constructed using the Dijkstra’s dynamic routing algorithm and second-order cone relaxation distribution network reconfiguration method,to realize orderly recovery of a distribution network during CPS concurrent faults.Related investigations are made based on the DCPS-160 case,and the accuracy and effectiveness of the proposed model are also verified.

关键词： Collaborative fault cyber-physical-systems distribution network double layer optimization

Coordination Control Method for Preventing Sub/Super Synchronous Oscillations of Multi-wind Farm Systems

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CSEE Journal of power and Energy Systems 2023年第5期9卷 1655-1665页

作者： Guoqing He Weisheng Wang Haijiao Wang China Electric Power Research Institute Beijing 100192China

In recent years,sub/super-synchronous oscillations occur frequently in large-scale wind power bases throughout China.Since the oscillation frequencies are close to the fundamental frequency,the current components can spread over a large area,and may destroy the shafting of rotating devices in the power grid.Improving the control strategy and parameters of wind turbines can prevent this problem to some extent,however,due to complex operational conditions and continuous development of wind power,the off-line improvement measures on wind turbines cannot eliminate the potential oscillation risks.This paper proposes an oscillation risk screening and stability assessment method,and develops a coordination control method for large-scale wind farm systems to prevent sub/supersynchronous oscillations.The Nyquist criterion and the modal analysis method are combined to generate quantitative factors for the stability assessment and the control strategy design.The coordination control method consists of minute-level power coordinated allocation and second-level fast power control to prevent and eliminate the oscillations.A detailed simulation model of a multiple wind farms system originated from an actual wind power base in China is presented to verify the effectiveness of the proposed method.

关键词： Coordination control prevention sequence impedance sub/super-synchronous oscillations wind farm

Experimental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

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High Voltage 2024年第1期9卷 182-194页

作者： Lin Yang Zhiqiang Chen Yanpeng Hao Xinhao Lin Lei Yu Yue Li Zhiyong Yuan Licheng Li School of electric power South China University of TechnologyGuangzhouChina electrical power research institute China Southern Power GridGuangzhouChina Electric Power Research Institute of Guizhou power Grid Co.Ltd. GuizhouChina

Ice monitoring methods were applied for 110 kV and above transmission lines with tangent towers.However,the change in the vertical span is not considered,and a significant difference lies in the tower-conductor structure of 10 kV transmission lines.For this reason,a proposal is made about the ice monitoring method for the 10 kV transmission line with tangent tower in alpine landform,which includes the ice monitoring system based on pressure measurement and corresponding equivalent ice thickness calculating methods.Different methods calculate the vertical span under different height difference coefficients.A finite element simulation model and a simulated ice load experiment system are established based on real conductors and insulators.Experiments and simulations under four simulated terrains are conducted within 2.5–20 mm ice thickness range.The comparison is made between this method and the method without considering the change in vertical span.The results show that the two methods are consistent and the relative errors are lower than�4%in simulation and�10%in experiment when the height difference coefficient is 0.When it is not 0,the relative errors of this method fall between t0.38%and t6.78%in simulation and−6.40%to t6.60%in experiment,while the relative errors of the method without considering the change in vertical span ranges between−11.13%and−20.23%in simulation and−11.65%to−23.20%in experiment.

关键词： methods tangent method

Graph Computing and Its Application in power Grid Analysis

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CSEE Journal of power and Energy Systems 2022年第6期8卷 1550-1557页

作者： Mike Zhou Jianfeng Yan Qianhong Wu China Electric Power Research Institute Beijing 100192China

Approaches to apply graph computing to power grid analysis are systematically explained using real-world application examples.Through exploring the nature of the power grid and the characteristics of power grid analysis,the guidelines for selecting appropriate graph computing techniques for the application to power grid analysis are outlined.A custom graph model for representing the power grid for the analysis and simulation purpose and an in-memory computing(IMC)based graph-centric approach with a shared-everything architecture are introduced.Graph algorithms,including network topology processing and subgraph processing,and graph computing application scenarios,including in-memory computing,contingency analysis,and Common Information Model(CIM)model merge,are presented.

关键词： CIM model merge contingency analysis Graph computing in-memory computing network topology processing power grid analysis subgraph processing

Parameter Identification for Static Var Compensator Model Using Sensitivity Analysis and Improved Whale Optimization Algorithm

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CSEE Journal of power and Energy Systems 2022年第2期8卷 535-547页

作者： Qiang Guo Lei Gao Xiaojie Chu Huadong Sun China Electric Power Research Institute Beijing 100192China

A parameter estimation method based on an improved Whale Optimization Algorithm is proposed in this paper to identify the parameters of a static var compensator(SVC)model.First,a mathematical model of SVC is established.Then,the reverse learning strategy and Levy flight disturbance strategy are introduced to improve the whale optimization algorithm,and the improved whale optimization algorithm is applied to the parameter identification of the static var compensator model.Finally,a stepwise identification method,by analyzing the local sensitivities of parameters,is proposed which solves the problem of low accuracy caused by multi-parameter identification.This method provides a new estimation strategy for accurately identifying the parameters of the static var compensator model.Estimation results show that the parameter estimation method can be an effective tool to solve the problem of parameter identification for the SVC model.

关键词： Local sensitivity analysis parameter estimation static var compensator model stepwise identification method whale Optimization Algorithm

Dynamic Response of Tension Plate for UHVDC Transmission Lines Under Ice Shedding Loads

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CSEE Journal of power and Energy Systems 2022年第3期8卷 952-962页

作者： Jiajun Si Lixian Zhou Kuanjun Zhu Hongyan Zhao Bin Liu Xiaoming Rui Shengchun Liu China Electric Power Research Institute Beijing 100192China North China electric power University Beijing 102206China Beijing institute of Astronautical Systems Engineering Beijing 100075China Electric Power Research Institute Beijing 100192China

Ice shedding problems have severely threatened the safety of overhead transmission lines and caused enormous ruptures or failures of the conductors and their accessories.It is of great importance to study the dynamic properties of the transmission lines under ice shedding loads.To perform such analysis,the dynamic behavior of two typical strain sections for UHVDC transmission lines under different ice shedding conditions were simulated in this paper.Then,the dynamic response of the key tension plate as well as its buckling properties was analyzed based on the extacted ice shedding results.Finally,laboratory tests were conducted at the China Electric Power Research Institute to assess the critical value of the buckling of the tension plate.The results show that the key tension plate studied in this paper is primarily influenced by the loads along the transmission lines after taking its dynamic response and buckling properties under synthetic ice shedding conditions into consideration.The short-term fluctuation of the tension should be the major focus in tension plate designs.

关键词： Dynamic response ice shedding effect nonlinear buckling tension plate UHVDC transmission lines