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2019 IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2019

作者： Du, Yaxin Zhang, Tingting Zhang, Wen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education School of Electrical Engineering Jinan China

ISBN: (纸本)9781728108131

Owing to the climate change, it is expected that the frequency and severity of extreme weather will increase in the future. In order to avoid large-scale blackouts resulting from such events, it is important to take measures to enhance the distribution system resilience. This paper proposes an approach for enhancing the distribution system resilience to extreme weather using multi-energy coordination. First, a four-part resilience analysis framework is constructed as the basis for assessing the distribution system resilience and the effectiveness of resilience enhancement measures. Then, the distribution system resilience enhancement is achieved through conversion of gas to electricity and coordination of multi-energy demands. An optimal load-shedding model is employed during the response process to minimize the load losses in distribution system after fault, where the dynamic characteristic of gas system is considered. Simulation results show the validity of the proposed approach in resilience enhancement. © 2019 IEEE.

关键词： Electric power plant loads

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Multi-objective partition planning for multi-infeed HVDC system

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Global Energy Interconnection 2021年第1期4卷 81-90页

作者： Zhao Yu Shuanbao Niu Chao Huo Ning Chen Kaige Song Xiaohui Wang Yu Bai State Grid Corporation of China Beijing100031P.R.China Northwest Branch State Grid Corporation of ChinaXi’an710048P.R.China National Key Laboratory of Operation and Control of Renewable Energy and Energy Storage China Electric Power Research Institute(Nanjing)Nanjing210003P.R.China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan250061P.R.China Langfang Power Supply Company State Grid Jibei Electric Power Company LimitedLangfang 065000P.R.China

The close proximity and the necessity of coordination between multiple high-voltage direct currents(HVDCs)raise the issue of grid partitioning in multi-infeed HVDC systems.A multi-objective partition strategy is proposed in this *** types of relationships to be coordinated and complemented are analyzed and formulated using quantitative *** to the graph theory,the HVDC partition is transformed into a graph-cut problem and solved via the spectral clustering ***,the proposed method is validated for a practical multi-HVDC grid,confirming its feasibility and effectiveness.

关键词： Multi-infeed HVDC system Grid partition Multi-objective planning Spectral clustering

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Placement and capacity selection of battery energy storage system in the distributed generation integrated distribution network based on improved NSGA-II optimization

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JOURNAL OF ENERGY STORAGE 2022年 52卷

作者： Gu, Tianming Wang, Puyu Liang, Fangyu Xie, Guangen Guo, Ling Zhang, Xiao-Ping Shi, Fang Nanjing Univ Sci & Technol Sch Automat Dept Elect Engn Nanjing 210094 Jiangsu Peoples R China Univ Birmingham Sch Engn Dept Elect Elect & Syst Engn West Midlands Birmingham B15 2TT W Midlands England Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

The scalability of distributed generation (DG) dominated by clean energy in the distribution network is continuously increasing. Increased grid integration of DGs has aggravated the uncertainty of distribution network (DN) operation, which affects the power losses and voltage fluctuations. The battery energy storage system (BESS), as an essential part of the distribution grid, its appropriate placement and capacity selection can improve the power quality and bring economic benefits for the DGs integrated DN (DGDN). In this paper, the placement and capacity selection of BESS in the DGDN is investigated including: (1) The relationship between the placement and capacity selection of BESS with the power losses and line voltages of the DN is derived. The impact of the placement and capacity selection of BESS on the power losses and voltage fluctuations of the DGDN is analyzed. (2) In order to achieve the objectives of a minimum of power losses, voltage fluctuations and BESS capacity in the DGDN, a multi-objective model with optimized placement and capacity of the BESS is established. (3) In order to ensure the globality and uniformity of Pareto solution set, an improved algorithm based on nondominated sorting genetic algorithm-II (NSGA-II) is proposed to optimize the process of traditional NSGA-II optimization. By adding the selection coefficient of population optimal solution and the congestion distance update function, the population dispersion is expanded and the global searching capability of the algorithm is enhanced. (4) Based on the improved NSGA-II optimization, an optimal scheme of the placement and capacity of the BESS is selected based on information entropy weight (IEW)-analytic hierarchy process (AHP). Taking an IEEE 33-node DGDN as an example, the proposed algorithm is compared with the traditional NSGA-II optimization and the multi-objective particle swarm optimization (MOPSO) algorithm to verify the effectiveness and superiority of the BESS optimal placem

关键词： Distributed generation integrated distribution network (DGDN) Placement and capacity selection of battery energy storage system (BESS) Multi-objective optimized model Pareto solution set Improved non-dominated sorting genetic algorithm-II (NSGA-II) power losses and voltage fluctuations

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Communication Structure Design of controllable Residential Loads

Communication Structure Design of Controllable Residential L...

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

作者： Xin Ge Xiaodong Chu Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan P.R. China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

A large number of controllable loads on the user side, especially scattered and flexible controllable residential loads, plays an important role in the safe, reliable and economic operation of the power grid. At present, they have been widely used in many aspects of the power grid such as demand-side management, dynamic security enhancement, etc. In order to achieve the integration of multiple controllable loads in the power grid, not only a reliable control strategy is required, but also need a communication structure with good performance including strong load-carrying capacity, low latency and appropriate network throughput. This communication structure would support the transmission of data packets or control commands between the controllable loads and the power grid. This paper proposes a three-tier communication structure of controllable residential loads, establishes a corresponding model based on OPNET and simulates in four different scenarios by collecting three statistics to verify the feasibility of this model.

关键词： Load modeling power grids Analytical models Wireless communication Companies Reliability Simulation

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Effective Open-Loop Process Based Stability Criterion for Wide-Band Oscillation

Effective Open-Loop Process Based Stability Criterion for Wi...

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

作者： Bin Qi Lei Gao Hua Ye Huadong Sun Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Power System Department China Electric Power Research Institute Beijing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Wide-band oscillation arising in grid-connected doubly-fed induction generator (DFIG) systems became increasingly prominent. To address this problem, a stability criterion for wide-band oscillation of power grid-connected DFIG system is proposed based on effective open-loop process (EOP) theory. First, the coupled multi-input multi-output (MIMO) model of grid-connected DFIG system is established based on synchronous reference frame (SRF). Second, the reference frame of grid-connected DFIG system model is transformed by linear transformation, and then the transformed MIMO system is decoupled into two decoupled single input single output (SISO) systems using EOP theory. The mathematical expression of system's stability criterion is derived based on the equivalent SISO models. Finally, the correctness of the proposed stability criterion is validated by time-domain simulation.

关键词： Doubly fed induction generators power system stability Stability criteria Oscillators MIMO communication Time-domain analysis

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A Fault Location Method based on Cause-effect Network in Active Distribution Network 8

A Fault Location Method based on Cause-effect Network in Act...

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IEEE 8th Joint International Information Technology and Artificial Intelligence Conference (ITAIC)

作者： Xie, Xiufang Gao, Zhanjun Zhang, Jianlei Wang, Zhiyuan Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

ISBN: (纸本)9781538681787

This paper proposes a fault location method using the cause-effect network reverse inference function. It mainly deals with the issues of existing fault location algorithms in the active distribution network, especially the complex models of fault location and slow calculation speed. This method establishes the fault matrix based on the cause-effect network. The alarm information issued during the fault is fully utilized to establish the correlation vectors. Besides, the method eliminates the interference of the backup protection action through the matrix operation. As a result, the fault location model in this paper has the advantages of simple structure, accurate positioning, and fast calculation speed. Finally, through the verification of the actual active distribution network, the fault location model based on the cause-effect network has good applicability in the active distribution network.

关键词： Active distribution network cause-effect network fault location

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Robust transmission expansion planning model considering multiple uncertainties and active load

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Global Energy Interconnection 2021年第5期4卷 476-484页

作者： Wensheng Li Long Zhao Yin Bo Weilun Wang Mingqiang Wang Shuai Liu Rui Liu Xian Wang Economic&Technology Research Institute State Grid Shandong Electric Power CompanyJinan 250021Shandong ProvinceP.R China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061Shandong ProvinceP.R China Global Energy Interconnection Group Co. Ltd.Xicheng District100031BeijingP.R.China

Uncertainty must be well addressed in transmission expansion planning(TEP)problem,and it significantly affects the reliability and cost-effectiveness of power *** to the complex operating environment of power systems,it is crucial to consider different types of uncertainties during the planning *** this paper,a robust TEP model is proposed by considering multiple uncertainties and active ***,in this model,the uncertainties of wind power output and contingency probability are considered *** uncertainties are described by scenario and interval,and the Benders decomposition technique is applied to solve the *** feasibility and effectiveness of the proposed model are illustrated using the IEEE RTS and IEEE 118-node systems.

关键词： Benders decomposition Transmission expansion planning Robust optimization Uncertainty

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Security Assessment of Interdependent Electricity-Gas Networks

Security Assessment of Interdependent Electricity-Gas Networ...

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Sustainable power and Energy Conference (iSPEC)

作者： Tongxin Wei Xiaodong Chu Yutian Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan P.R. China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

Integrated energy networks are superb energy system configurations. There emerges many types of integrated energy networks, in which interdependent electricity-gas networks are commonly implemented ones. Security assessment the integrated energy network is a vital research topic, which is studied in this paper. First, the models of interdependent electricity-gas networks are shown with the coupling mechanism analyzed. Second, security assessment of the interdependent networks is implemented, in which the loss of load is selected as the indicator weighing security. Third, security assessment on the test electricity-gas networks is conducted. Simulation results demonstrate the effectiveness of the proposed security assessment strategy.

关键词： Couplings Analytical models power system dynamics power grids Security Natural gas Load modeling

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Protection in Active Distribution Network Against Short Circuit Fault and Broken line Fault

Protection in Active Distribution Network Against Short Circ...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Zhiyuan Wang Zhanjun Gao Maoran Zheng Jiang Yu Peng Zong Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China China Southern Power Grid Guangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

Under extreme weather, the active distribution network will not only have short circuit fault, but also have broken-line fault. At present, the distribution protection method does not consider multiple fault types comprehensively. This paper proposes an active distribution protection method for short circuit fault and broken-line fault. Based on the analysis of short-circuit fault and broken-line fault, it is concluded that the amplitudes of the current on both side of the fault line and their adjacent currents are different. Based on this feature, a protection criterion for comparing current amplitude is proposed, and the validity of the criterion is verified by simulation.

关键词： Simulation system integration Internet Circuit faults Active distribution networks Integrated circuit modeling Meteorology

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Analytically derived fixed termination time for stepwise inertial control of wind turbines-Part I: Analytical derivation

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2020年 121卷 106120-106120页

作者： Bao, Weiyu Ding, Lei Liu, Zhifan Zhu, Guofang Kheshti, Mostafa Wu, Qiuwei Terzija, Vladimir Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Shandong Elect Power Co Econ & Technol Res Inst Jinan 250021 Peoples R China Tech Univ Denmark Ctr Elect Power & Energy Dept Elect Engn DK-2800 Lyngby Denmark Univ Manchester Sch Elect & Elect Engn Manchester M13 9PL Lancs England

Type-3 (Double fed induction generator, DFIG) and type-4 (full rated power converter connected) wind turbines (WTs) can participate in frequency control of power systems using stepwise inertial control (SIC) by releasing kinetic energy stored in rotors into the grid. During SIC, the rotor speed decreases as a part of a primary frequency drop, when extra active power is injected into the grid, supporting frequency control. Once the available kinetic energy has been released, the SIC has to be terminated and the WT's output power drops instantaneously to allow rotor to reaccelerate back to the nominal speed. This WT's output power drop is actually a disturbance, negatively affecting the system frequency, so that a new, secondary frequency drop (SFD) occurs. To minimize the SFD, this paper proposes a new method for determining when the SIC should be terminated. This important information is necessary to be known to optimize the entire SIC and ensure maximal contribution to the frequency control. A new analytical expression, defining the relationship between the SIC termination time and the SFD, is derived. Furthermore, it was concluded that an optimal termination time, minimizing the SFD, can be numerically obtained, but requiring time-consuming calculations. To make the determination of the optimal termination time more practical, a new expression for determining it analytically is derived. This time is referred to as fixed termination time (FTT). If the SIC is terminated at the instance correlating to the FIT, the SFD will be minimal and the contribution of the WT to the frequency control will be the most effective. This paper has its extension, the Part II paper, proposing an application strategy of the FTT.

关键词： Kinetic energy

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