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

作者： Yuqian Wu Mingqiang Wang Mengxia Wang Linguo Jing Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Tangshan Power Supply Company Tangshan China State Grid Binzhou Power Supply Company Binzhou China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

With the increase of proportion of renewable energy, the uncertainty in power system is significantly increased, and the security operation of power system is facing more challenges. In traditional economic dispatch model, the unit output and load are expressed by constant power, which ignores the automatic regulation effect during system operation. And the transmission system and distribution system are separated optimized, the coordination effect is not considered. In this paper, a new dynamic economic dispatch model is proposed and the automatic regulation effect and transmission-distribution coordination are considered, which can improve the renewable energy accommodation and enhance the system operation security and economics. The validity and effectiveness of the proposed model are illustrated by case studies.

关键词： Voltage control Load modeling Economics power system dynamics Renewable energy sources Reactive power

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Dynamic reconfiguration of active distribution network considering multiple active management strategies 3

Dynamic reconfiguration of active distribution network consi...

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3rd International Conference on Energy Engineering and Environmental Protection (EEEP)

作者： Bao, Wei Zhang, Shaohui Song, Yichen Wang, Mingqiang Li, Xiao Yan, Yuehao Fu, Xiaoyong State Grid Zhengzhou Power Supply Co Zhengzhou Henan Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

To make full use of various active management resources in ADN to improve the economic efficiency, a dynamic reconfiguration model of active distribution network considering multiple active management (AM) strategies is proposed in this paper. The AM strategies including the configuration of energy storage system, output power controlling of distributed generation, reactive power compensation with static var compensators and packet capacitor switching, tap adjusting with on-load tap changer, and demand side response management. The model tries to minimize the total costs with respect to various operating constraints. Several linearization techniques are applied to formulate the dynamic reconfiguration problem into a mixed-integer linear programming (MILP) model, which guarantees global optimal solution and also reduces the computational difficulty significantly. Finally, the validity and effectiveness of the proposed dynamic reconfiguration model is verified on the IEEE 33-node distribution network system.

关键词： Static Var compensators

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Mine Cable Insulation Double-End Synchronous Monitoring with 5G Transmission Technology

Mine Cable Insulation Double-End Synchronous Monitoring with...

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IEEE Student Conference on Electric Machines and systems

作者： Chen Feng Ming Yang Xiangjun Zeng Peng Chen The Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China School of Mechanical Electronic and Information Engineering China University of Mining and Technology (Beijing) Beijing China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

For the neutral point non-effectively grounded system in coal mine power grid, the single-phase ground fault current is quite small, and the steady-state characteristics are non-significant. Therefore, it is quite difficult to detect a small current ground fault effectively, especially for a coal mine power grid. To facilitate single-phase ground fault diagnosis, this paper proposes a new cable insulation monitoring method taking advantage of the 5G transmission technology. This method can independently calculate and analyze the insulation state of each phase, and is not affected by the grounding type. In the proposed method, the 5G communication technology is applied to solve the underground signal transmission problem and realize GPS timing function underground. The underground cable insulation monitoring data can therefore be transmitted to the ground, and a cloud server can be set up for the signal analysis and corresponding calculation. The structure and key technologies of the proposed double-end synchronous monitoring method are analyzed. And the method is verified by simulation on a three-phase cable model. Factors that may cause relative errors corresponding to the actual measurements using the proposed method are discussed at the end of this paper.

关键词： Voltage measurement 5G mobile communication Cable insulation power grids Dielectric measurement Electrical resistance measurement Monitoring

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The impact of DG's location on the small signal stability of the distribution network 3

The impact of DG's location on the small signal stability of...

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3rd International Conference on Energy Engineering and Environmental Protection (EEEP)

作者： Zhang, Shaohui Bao, Wei Xu, Jiadong Han, Xueshan Wang, Mingqiang Yan, Yuehao Fu, Xiaoyong State Grid Zhengzhou Power Supply Co Zhengzhou Henan Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

The distribution network has been integrated with more and more distributed generations. Most of these generations are inverter based photo-voltaic plant or DFIG based wind farm. As the proportion of these renewable energies goes high, the stability problems, especially the small signal stability problems gain attention from researchers. Literatures have conducted on the single machine infinite bus system of them, focusing mostly on their dynamic characteristics. This paper analyses the impact of DG's location on the small signal stability of the distribution network, which includes DGs, network and dynamic load. The conclusion is drawn from the modal analysis, and is verified by time domain simulation.

关键词： Dynamic loads

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The Development and Analysis of Primary Frequency Regulation and AGC Test in Shandong power Grid 5

The Development and Analysis of Primary Frequency Regulation...

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5th International Conference on Energy Materials and Environment Engineering (ICEMEE)

作者： Yu, Qingbin Xin, Gang Cao, Yongji Li, Yuanyuan Yan, Qing State Grid Shandong Elect Power Res Inst Jinan 250002 Shandong Peoples R China Shandong Elect Power Dispatch Control Ctr Jinan 250002 Shandong Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

Based on the 2018 entire-gird primary frequency regulation and AGC test, the concrete procedures and obtained results of Shandong power grid are analyzed at length. In combination with the published standards and specifications, the new techniques adopted in the test are analyzed. And then, according to the emerging problems during the test, the improvement measures and optimization suggestions are proposed. With the help of analyzed results and proposed advices, the further technical supervision work of source-network coordination can be developed and thermal unit performance can be improved.

关键词： Electric power transmission networks

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Fault Model of Inverter Interfaced Distributed Generator Adopting PQ control Strategy Considering Current Tracking Capability of Converter

Fault Model of Inverter Interfaced Distributed Generator Ado...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Wei, Chuanzhi Shi, Xiaohan Zhou, Boxi Liu, Yang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid of China Technology College Jinan China State Grid Shandong Electric Power Research Institute Jinan China

ISBN: (纸本)9781728135205

As the scale of inverter interfaced distributed generator (IIDG) in low-voltage grid expanding, the changes of distribution network's fault characteristics are drawing great attention. The fault modeling method of IIDG gradually becomes an important part of the fault analysis of distribution network with IIDGs. This paper proposed an IIDG fault model considering the current tracking capability of the converter based on the analysis of the dynamic model, control system and parameter design of IIDG. In the proposed model, IIDG was equivalent to a voltage-controlled current source and a voltage- controlled voltage source according to whether the converter current tracks the reference exactly, which reflects the control characteristics of IIDG under different fault conditions. The case studies show that the calculation results based on proposed model are more consistent with electromagnetic transient simulation than that of existing model and have verified the high calculation accuracy as well as simplicity of the proposed model. © 2019 IEEE.

关键词： Electric inverters

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Wind power Fluctuation Smoothing with BESS Considering Ultra-short-term Prediction

Wind Power Fluctuation Smoothing with BESS Considering Ultra...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Zhao, Yawen Shi, Xiaohan Zhou, Boxi Wang, Xiaolei Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid of China Technology College Jinan China Huaneng Shandong Power Generation Co. Ltd Jinan China

ISBN: (纸本)9781728135205

Nowadays, power system often faces the intractable problem of power fluctuation due to the intermittency and stochasticity of renewable energy, such as wind and photovoltaics, generation system. The energy storage system, such as the battery energy storage system (BESS) is an effective way to smooth the power fluctuation so as to increase the allowed penetration level of renewable energy generation in power grid. However, the cost of the energy storage system is still very high and the efficient control strategies are needed to improve the benefit of per unit energy storage as high as possible. In view of that, this paper proposed a novel control strategy for BESS based on the common moving average filter (MAF) and ultra-short-term wind power forecast. By adding future wind power data predicted into inputs of the filter, the MAF could possess the characteristic of nearly zero phase delay, which almost eliminates the low-frequency components in the load of BESS. The control strategy proposed enables BESS to focus on the compensation of the high-frequency components of the wind power, therefore obtaining better smoothing results for given BESS and improving its economic efficiency. Simulation results in various scenarios verify the effectiveness of the proposed method. © 2019 IEEE.

关键词： Wind power

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Comparative Study of EKF and UKF for SOC Estimation of Lithium-ion Batteries

Comparative Study of EKF and UKF for SOC Estimation of Lithi...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Xiao, Tian Shi, Xiaohan Zhou, Boxi Wang, Xiaolei Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid of China Technology College Jinan China Huaneng Shandong Power Generation Co. Ltd Jinan China

ISBN: (纸本)9781728135205

With the expanding application of lithium-ion batteries, the state of charge (SOC) estimation based on the Kalman filter (KF) draws great attention. However, lots of KF's variants, such as extended Kalman filter (EKF) and unscented Kalman filter (UKF) are available. In order to find the suitable KF variant for SOC estimation, this paper studies the performance of EKF and UKF in three scenarios based on the two-order RC model by elaborative simulation. The accuracy and convergence of the two filters are compared. The impact of the model deviation on the estimated results is also tested to evaluate the robustness. The test results show that EKF performs much the same as UKF in its accuracy, rate of convergence as well as robustness to model errors in most cases. © 2019 IEEE.

关键词： Extended Kalman filters

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Bi-level optimal energy storage system configuration in active distribution network 2

Bi-level optimal energy storage system configuration in acti...

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2nd IEEE International Conference on Electronics Technology, ICET 2019

作者： Xu, Qingwen Cao, Yongji Zhang, Hengxu Ma, Changhui Yang, Dong Ma, Huan Zhao, Kang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Grid Shandong Electric Power Company State Grid Shandong Electric Power Research Institute Jinan250002 China

ISBN: (纸本)9781728116181

Considering the ability of rapid power regulation and energy charging and discharging, the energy storage system (ESS) is of great importance for active distribution network (ADN) to enhance renewable energy accommodation. This paper proposes a bi-level optimization approach to conFigure the ESS in ADN. In the inner-level optimization, the low-pass filtering algorithm is implemented for the extraction of high-frequency integration power and a bi-objective optimization model is established to minimize the high-frequency power variation and renewable energy curtailment. Subsequently, in the outer-level optimization, the other bi-objective optimization model incorporating the minimization of capital cost and renewable energy curtailment is established based on the inner-level model. Furthermore, the inner-and outer-level optimization models are solved alternately and iteratively via the coupling variables, in which the inner-level model is solved by the scalarization method and particle swarm optimization algorithm, and the outer-level model is solved by the NSGA-II. A case study is presented to verify the proposed model and corresponding solving approach. © 2019 IEEE.

关键词： Energy storage

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TSO and DSO with large-scale distributed energy resources: A security constrained unit commitment coordinated solution

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INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY systemS 2020年第3期30卷

作者： Nawaz, Aamir Wang, Hongtao Wu, Qiuwei Ochani, Manesh Kumar Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jingshi Rd 17923 Jinan 250000 Shandong Peoples R China Tech Univ Denmark Dept Elect Engn Ctr Elect Power & Energy DK-2800 Lyngby Denmark

Modern power system requires optimally coordinated operation between transmission and distribution systems due to large-scale integration of distributed energy resources (DERs). Commonly, transmission system operator (TSO) solves its own cost optimization problem and evaluates required targets for each distribution system operator (DSO). Thus, TSO problem becomes more complex and highly scaled with increase in number of connected distribution systems, which requires more computational time and resources. Therefore, this paper proposed a method to reduce computational burden on TSO and solve coordinated security constrained unit commitment (C-SCUC) problem by involving a coordinator in upper level hierarchy. Coordinator is required to solve system-wide problem to adjust targets for transmission system (TS) and all distribution systems (DS). Besides, TSO and DSO only need to solve their own cost optimization problems. In this paper, we have proposed analytical target cascading (ATC) along with hybridized particle swarm optimization with differential evolution (PSO-DE) for solving increased complexity of the coordinated problem. ATC provides coordination between transmission and distribution sections of power system while hybrid PSO-DE provides better accuracy of optimization in ATC layers. For evaluation of efficacy of proposed method, this paper has taken IEEE 118-bus system as TS and IEEE 33-bus system as DS. Results has depicted that proposed method could help TSO in reducing computational resources and improving computational time.

关键词： analytical target cascading differential evolution distribution system particle swarm optimization transmission system TSO-DSO coordination

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