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A Measurement Method for Wide-frequency Harmonic Signal in Power grid Based on Window Interpolation FFT and RLS-Adaline Neural Network

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Journal of Physics: Conference Series 2021年第1期1920卷

作者： Jiawei Peng Shuguo Pan Wenxiu Wang Min Zhang Jian Shen Wang Gao Chenglin Xia School of Instrument Science and Engineering Southeast University Nanjing Jiangsu 210096 China School of Electronic and Information Engineering Jinling Institute of Technology Nanjing Jiangsu 211169 China Nari Technology Co. Ltd Nanjing Jiangsu 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu 211106 China

With the inc.ease of non-linear loads in power grid and the development of power electronics, the growing serious harmonic pollution has put forward higher requirements for the accuracy and real-time performance of the measurement method. For this problem, this paper proposes a wide-frequency harmonic signal measurement method based on window interpolation FFT and adaptive neural network. After the window function is selected, the frequency of harmonic is estimated by double-spectrum-line interpolation algorithm based on three-term third derivative Nuttall window, and then the smoothed frequencies are input into RLS-Adaline neural network to estimate the amplitude and phase of each harmonic. The simulation results show that the proposed method has higher measurement accuracy and stability under few data conditions and low signal-to-noise ratios than conventional window interpolation algorithms. High accuracy measurement of harmonics with short time window in the range of 0∼2.5kHz is effectively realized.

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Support System for Operation Status Awareness and Troubleshooting of UHVDC Transmission System

Support System for Operation Status Awareness and Troublesho...

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2018 International Conference on Advanced control, Automation and Artificial Intelligence (ACAAI2018)

作者： Jinjun Lu Xin Shan Yi Wang Xi Xu NARI Technology Co.Ltd. State Key Laboratory of Smart Grid Protection and Control

The transmission capacity of ultra-high voltage direct current(UHVDC) transmission system is huge. Once a fault occurs, it will bring tremendous impact on the operation of the power grid, bring about a number of problems such as power flow overload, insufficient reserve, and frequency drop, and induce chain failure. Therefore, it is necessary to adopt a comprehensive Precautions. This article describes the specific ideas and implementation methods of solving problems from the overall solutions to the handling of UHVDC faults, the risk assessment and prevention in advance, the real-time monitoring of events, and the assistance in emergency recovery *** method mentioned above has been operated in some regional and provinc.al power companies for demo purpose, and has played an important role in the handling of DC blocking events many times.

关键词： Ultra-high voltage direct current(UHVDC) Risk assessment Assistance decision Preventive control Real-time monitoring

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A Quick Generation Method for Power grid Graphs and Models in SCADA System

A Quick Generation Method for Power Grid Graphs and Models i...

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2018 2nd International Conference on Applied Mathematics, Modelling and Statistics Application (AMMSA 2018)

作者： Rongrong Cao NARI Technology Development Co. Ltd State Key Laboratory of Smart Grid Protection and Control

In the large power grid dispatching and control system, the unmanned substations bring a large amount of graph drawing and model input work to the automation maintenance personnel. The complicated work inc.eases the error probability and hidden dangers, and it is difficult to adapt to the development of the large power grid. Therefore, it is very necessary to realize the quick generation method of power grid graphs and models in the large power grid dispatching and control system. This paper proposes a method for quick generation of graphs and models in SCADA system. This method is based on the design concept of object-oriented graph and model integration and realizes the quick generation of similar substations. This design has been used in real application widely and makes the maintenance of the automation system more conveniently, rapidly and accurately.

关键词： quick generation graph drawing model input graph and model integration

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A correction method for HVDC transmission plan considering the correlation between sending end new energy generation and receiving end loads

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Energy Procedia 2018年 145卷 193-198页

作者： Liang Lei Wang Julong Li Mingying Chen Ming NARI Technology Co. Ltd. Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106 China

Recently, new energy is conversely distributed and centralized grid connection which need transmit redundant power to other regions urgently by HVDC system. Based on the characteristics of new energy, this paper analyzes the correlation between sending end new energy and receiving end loads by person correlation coefficient method and proposes a correction method for HVDC transmission plan considering the correlation which promotes new energy penetration level and improves utilization of HVDC system. By taking a HVDC system as an example, the results of analyzing practical scheduling data in 2015 demonstrate the feasibility of the proposed method.

关键词： New energy Correlation coefficient method HVDC transmission plan

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Day-ahead optimal scheduling of integrated energy system with electric heat pump

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IOP Conference Series: Earth and Environmental Science 2020年第1期431卷

作者： Nianchu Zhang Qi Wang Ming Ni Manli Li Zheng Zhang Nanjing Normal University (College of Electrical and Automation Engineering) Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

The regional integrated energy system is an effective way to realize energy cascade utilization and improve the flexibility and economy of the load side operation. Combine cooling heating and power (CCHP) system is a typical form of integrated energy systems. However, due to heat-load-based operation mode, the peak modulation capacity of CCHP units and the accommodation of renewable energy are limited. This paper explores methods of inc.easing the flexibility and economy of the system. An optimal scheduling model is proposed for integrated energy systems containing an electric heat pump, considering heating network characteristics. Simulation results show that the electric heat pump can help the system realize heat-and-power decoupling, improve the flexibility of the system and reduce the operating cost of the system.

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Performance evaluation of ad-hoc routing protocols in hybrid MANET-satellite network 3rd

Performance evaluation of ad-hoc routing protocols in hybrid...

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3rd International Conference on Machine Learning and Intelligent Communications, MLICOM 2018

作者： Xie, Xiaoye Wang, Jian Guo, Xiaobo Wu, Xiaogang Nanjing University Nanjing China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory The 54th Institute of CETC ShijiazhuangHebei China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 Chengxin Road Nanjing China

ISBN: (纸本)9783030005566

Hybrid MANET-satellite network is a natural evolution in achieving ubiquitous communication. Their combination gives full play to respective advantages—autonomy and flexibility of MANET, wide coverage and resilience to natural disasters of satellite network. Although large quantities of researches have been conducted on hybrid MANET-satellite network, there are relatively few researches on its routing. In this paper, we construct a basic model of hybrid MANET-satellite network and explore the performance and applicability of ad-hoc routing protocols in hybrid network. Simulation results by NS3 demonstrate that the hybrid network working in ad hoc manner can acquire the performance that conforms to the standard of QoS. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2018.

关键词： Satellites

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A Frequency control Model for Cyber Physical Power System Considering Demand Response Strategy

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Energy Procedia 2018年 145卷 38-43页

作者： Ni Ming Chen Qian Li Manli Wang Qi Tang Yi NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211106 China NARI Technology Co. Ltd. Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106 School of Electrical Engineering Southeast University Nanjing 210096 China

Due to the inc.ease of power transmission capacity, once an active power vacancy happens, power systems will face a serious frequency instability problem. With the development of communication technology in cyber physical power system (CPPS), demand response (DR) resources can take the initiative to reduce electricity utilization in order to tackle the system under-frequency challenge. This paper presented a frequency control model for CPPS considering DR strategy to rapidly forecast the effects of DR sources participating in frequency control. The model was verified through a case study as well.

关键词： load frequency control(LFC) cyber physical power system demand response

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Research and Application of Trans-Regional Cooperative Disposal of UHV Interconnected Power grid 3

Research and Application of Trans-Regional Cooperative Dispo...

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2017 3rd IEEE International Conference on control Science and Systems Engineering (ICCSSE)

作者： Shan Xin Jiang Yefeng Wu Li Jin Yiding Wang Yiyu Lu Jinjun NARI Group Corporation NARI Technology Co.Ltd State Key Laboratory of Smart Gird Protection and Control Jiangsu Electric Power Company of State Grid of China National Electric Power Dispatching and Control Center State Grid Corporation of China

ISBN: (纸本)9781538604854

With the rapid construction of UHV AC/DC power grid, the integration characteristics of power grid are becoming more and more prominent, and real-time operation control of dispatching is significantly becoming more and more difficult. The existing monitoring and control model based on the system model data cannot meet the requirements for the development of UHV power grid. Based on the existing achievements of dispatching automation system, the general goal and framework of the trans-regional cooperative disposal of UHV interconnected power grid are put forward, and the key technologies are analyzed in four aspects: situation awareness, fault location, joint disposal and cooperative control to provide reference and example for follow-up construction for real-time control and support system for the dispatching of UHV power grid.

关键词： UHV situation awareness cooperative disposal source grid load wide area graphic browsing DC fault diagnosis

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Status evaluation of smart substation measurement and control device

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IOP Conference Series: Materials Science and Engineering 2019年第4期563卷

作者： Zhang Min Shen Jian Chen Li Zhou Bin Zhou Shao Liang Hou Zhe NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China NARI Technology Corporation Co. Ltd Nanjing China

In power system, measurement and control device plays an important role in maintaining an ideal level of reliability. Therefore, the reliability of the measurement and control device should be evaluated to fully understand the cause of its failure. A new evaluation model is proposed, which relates the fault of measurement and control system with the four main reasons of device hardware fault, software fault, auxiliary equipment fault and human fault. In addition, the model can also comprehensively consider other aspects of the measurement and control system, such as human error in testing and software upgrade, effectiveness of daily operation monitoring, degree of dependence on self-inspection, local backup and misoperation. These studies have a lot of significance to the reliability of the control system, and also can effectively improve the stability of the system.

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Design and Implementation of Integrated Service Penetration technology Cross Security Region

Design and Implementation of Integrated Service Penetration ...

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

作者： Qiang Yi Shupeng Wan Kai Zhang Peng Chen Hailong Guo Baoshan Gao System R&D Center NARI Group Corporation NARI Technology Co. Ltd Nanjing China System R&D Center State Key Laboratory of Smart Grid Protection and Control Nanjing China

In the power dispatching automation system, production control security region and management information security region adopt forward and backward isolation devices for physical isolation, with the enhancement of the functional relevance between the security regions and the expansion of the system functions, one-way synchronization of production control security region to management information security region has been unable to meet the requirements of application expansion of supervisory control. In accordance with the princ.ples of safety protection standards, it is urgent to establish a data transmission mechanism that can cross the forward and backward isolation, realize service penetration cross the security region. In this paper, a scheme of integrated service invocation across the security region is proposed, which can be invoked by the service bus that can be transparent and unaware service bus, encapsulate cross domain service protocol, establish virtual access, and complete service invocation. Through the signature verification technology, the service message is tampered in the communication, the communication security of the service invocation is guaranteed, the rights of the service are obtained through the authorization and the security of the service invocation cross the security region. The integrated service invocation technology cross the security region has been applied in Jiangsu Provinc., Beijing and Hangzhou. It provides a safe and stable support for the construction of the grand operation system, and provides a powerful guarantee for the efficient operation of the power grid.

关键词： Security Production control Power systems Safety Servers Synchronization Dispatching

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