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A Deep Recurrent Neural Network for Non-Intrusive Load Monitoring Based on Multi-Feature Input Space and Post-Processing

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ENERGIES 2020年第9期13卷 2195页

作者： Rafiq, Hasan Shi, Xiaohan Zhang, Hengxu Li, Huimin Ochani, Manesh Kumar Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Shandong Univ Technol Sch Elect & Elect Engn Zibo 255049 Peoples R China

Non-intrusive load monitoring (NILM) is a process of estimating operational states and power consumption of individual appliances, which if implemented in real-time, can provide actionable feedback in terms of energy usage and personalized recommendations to consumers. intelligent disaggregation algorithms such as deep neural networks can fulfill this objective if they possess high estimation accuracy and lowest generalization error. In order to achieve these two goals, this paper presents a disaggregation algorithm based on a deep recurrent neural network using multi-feature input space and post-processing. First, the mutual information method was used to select electrical parameters that had the most influence on the power consumption of each target appliance. Second, selected steady-state parameters based multi-feature input space (MFS) was used to train the 4-layered bidirectional long short-term memory (LSTM) model for each target appliance. Finally, a post-processing technique was used at the disaggregation stage to eliminate irrelevant predicted sequences, enhancing the classification and estimation accuracy of the algorithm. A comprehensive evaluation was conducted on 1-Hz sampled UKDALE and ECO datasets in a noised scenario with seen and unseen test cases. Performance evaluation showed that the MFS-LSTM algorithm is computationally efficient, scalable, and possesses better estimation accuracy in a noised scenario, and generalized to unseen loads as compared to benchmark algorithms. Presented results proved that the proposed algorithm fulfills practical application requirements and can be deployed in real-time.

关键词： non-intrusive load monitoring deep recurrent neural network LSTM feature space energy disaggregation

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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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Corrigendum to ‘Distributional two-level synergetic unit commitment considering three scheduling states’

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Electric power systems Research 2023年 216卷

作者： Yumin Zhang Xuan Zhang Xingquan Ji Ming Yang Xueshan Han Ziyang Yin College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao 266590 China Key Laboratory of Smart Grid of Ministry of Education Tianjin University 300072 Tianjin China Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education Jinan 250061 China

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Nonlinear Decoupling control of Two-Terminal MMC-HVDC Based on Feedback Linearization

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IEEE TRANSACTIONS ON power DELIVERY 2019年第1期34卷 376-386页

作者： Li, Zheng Hao, Quanrui Gao, Feng Wu, Linlin Guan, Minyuan Shandong Univ Dept Elect Engn Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China State Grid Jibei Elect Power Res Inst Beijing 100045 Peoples R China Huzhou Power Supply Co State Grid Huzhou 313000 Peoples R China

The traditional proportional-integral control for a modular multilevel converter (MMC) design based on a two-level voltage source converter does not consider the dynamics of arm circulating currents and sub-module capacitor voltages, which will lead to the incomplete decoupling between powers and circulating currents for an MMC. In view of this, a nonlinear decoupling control strategy, which applies for two scenarios, e.g., active/reactive power control for a power controlled station (PCS) and dc voltage/reactive power control for a dc-voltage controlled station (DVCS), is proposed for an MMC station based on feedback linearization. First, the nonlinear feedback laws for PCS and DVCS are derived based on the nonlinear equations of an MMC. Next, the complete nonlinear decoupling control strategies for PCS and DVCS are developed. Following that, the zero dynamics stabilities of the two control schemes for PCS and DVCS are investigated. In addition, the method to design parameters of the outer linear controller is also proposed to satisfy the requirement of dynamic performance. Taking a two-terminal MMC-HVDC for example, the simulation in Simulink validates the good transient performance of the proposed nonlinear control, and its robustness is also validated against the changing of system parameters.

关键词： Modular multilevel converter nonlinear control feedback linearization zero dynamics stability decoupling control

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Dynamic Economic dispatch Considering Transmission-Distribution Coordination and Automatic Regulation effect of Transmission system

Dynamic Economic Dispatch Considering Transmission-Distribut...

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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 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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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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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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