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New Energy and power engineering (ICNEPE), International Conference on

作者： Xiongyao Deng Yuxiang Yan Chang Lin Hao Xia Ancheng Xue Zhihuai Shu Yu Liu Naichao Chang Chen Fan Zhongqing Li Jiangwen Meng Xuewei Dou Shenqiang Wang Long Zhang Fangying Wu State Key Laboratory of Alternate Electric Power System with Renewable Energy Source (North China Electric Power University) Beijing China National Electric Power Dispatching and Control Center of State Grid Corporation of China Beijing China Power Automation Department China Electric Power Research Institute Nanjing China China Electric Power Research Institute Beijing China Beijing Sifang Engineering Co. Ltd Beijing China

Substation is the core hub of power system. With the expansion of the scale of the power system and the improvement of its intelligence, the problems of the redundancy of architecture and equipment in the protection and monitoring system of substation can no longer be ignored. This paper proposes an evaluation method for integration in the protection and monitoring system based on G1 method. Firstly, according to the requirements of integration in the protection and monitoring system, the corresponding indicators are proposed to form an index system for evaluating integration. And then, an evaluation method is proposed for integration of the protection and monitoring system, based on G1 method and expert investigation. Finally, the feasibility of the evaluation method is verified by comparing and analyzing the evaluation results of a typical substation and its structural optimization substation.

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A Compatibility Evaluation Method for Substation Protection and Monitoring system Based on G1 Method and Expert Investigation

A Compatibility Evaluation Method for Substation Protection ...

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New Energy and power engineering (ICNEPE), International Conference on

作者： Hao Xia Xiongyao Deng Shizhong Ma Yuxiang Yan Ancheng Xue Yu Liu Zhihuai Shu Naichao Chang Zhongqing Li Jiangwen Meng Xuewei Dou Shenqiang Wang Fangying Wu Chen Fan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source (North China Electric Power University) Beijing China National Electric Power Dispatching and Control Center of State Grid Corporation of China Beijing China China Electric Power Research Institute Beijing China Beijing Sifang Engineering Co. Ltd Beijing China Power Automation Department China Electric Power Research Institute Nanjing China

In existing protection and monitoring system of substation(S-PMS), there are compatibility problems between hardware and software or between software-hardware combinations and systems, including differences in communication protocols between different manufacturers and differences in system adaptation. Compatibility issues have become a growing focus area for the power industry. This paper proposes a method to evaluates the compatibility of the protection and monitoring system of substation based on the G1 and expert investigation, for the existing or unbuilt substations. In detail, Firstly, according to the compatibility requirements of the substation protection and monitoring system, corresponding indicators are proposed and a comprehensive compatibility evaluation model is constructed. Secondly, based on the comprehensive evaluation model, the evaluation results of typical stations without domestic chips and optimized stations using domestic chips are compared to verify the feasibility of the proposed method.

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Hybrid Impedance Reshaping Method of Grid-Connected Inverters in Weak Grid

Hybrid Impedance Reshaping Method of Grid-Connected Inverter...

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power Electronics and power system Conference (PEPSC)

作者： Weike Zheng Haijiao Wang Bao Xie Meiqin Mao State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China Photovoltaic System Engineering Research Center of the Ministry of Education Hefei University of Technology Hefei China

Both the phase-locked loop (PLL) and the common coupling point (PCC) voltage feedforward may have impacts on the inverter system stability in weak grid. Therefore, a hybrid impedance reshaping control strategy is proposed in the paper. Firstly, the inverter impedance model is established. Next, the system stability is analyzed under weak grid, reflecting on the influence of PLL and the PCC voltage feedforward. Then, to improve the inverter system stability, the band-pass filter is added to the feedforward branch of PCC voltage, since it can attenuate the influence of unstable factors. Moreover, a new phase-locked loop structure containing a first-order decoupled complex filter is proposed, taking into account the fundamental positive voltage extraction characteristics of the first-order decoupled complex filter. The parameters of the hybrid impedance reshaping strategy are designed in detail. Finally, simulation is carried out to prove the theory analysis and hybrid impedance reshaping strategy in the paper.

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Research on Risk Situation Awareness and Prediction Method of Industrial control systems

Research on Risk Situation Awareness and Prediction Method o...

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system Reliability and Safety engineering (SRSE), International Conference on

作者： Chao Zhang Sijuan Chen Ming Yang Ruoyu Zhu Jiajun Sun Department of Science and Technology Innovation State Nuclear Power Automation System Engineering Company Shanghai China Institute for Advanced Study in Nuclear Energy & Safety College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen City Guangdong Province China Power Plant Control Center State Nuclear Power Automation System Engineering Company Shanghai China

In the operation process of the power plant, in addition to the operating state information of the power plant process systems and components is monitored by Industrial control systems (ICSs), a large number of the operating state information of ICSs and its components themselves can be obtained. These information helps operators to understand the operation safety state of ICSs themselves, and whether ICSs operate reliably, which plays an important role in maintaining the normal operation of the power plant, controlling abnormal events and mitigating the development of accidents. This paper proposes an integrated methodological framework for real-time risk awareness and prediction of ICS based on the particle filtering model whose features are updating monitoring data and predicting the state transition process, and focus on the measurement of risk states, identification of critical risk states and key components, modeling of the state transition process, prediction of risk levels and estimation of remaining arrival time of high-risk residual. The assumption that the transition probability matrix of system states does not change over time in traditional Markov predictions is discarded in this proposed method. Compared with the traditional ICS safety analysis method, this method can provide global and systemic risk insights for ICS risk situation, with a better real-time performance, and it is a kind of more scientific and objective measurement for ICS risk situation.

关键词： Process control Predictive models Particle measurements Real-time systems Data models Time measurement Safety

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An Optimization Method for Multi-loop Transient Performance Suitable for Multi-module Expansion

An Optimization Method for Multi-loop Transient Performance ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Yi Zhang Donglai Zhang Yunhan Fan Qian Wan Qing Liu Shaolin Wang Power Electronics and Motion Control Research Center Harbin Institute of Technology (Shenzhen) Shenzhen China Unit 61655 the People’s Liberation Army Chongqing China Department of Aerospace Power Shenzhen Aerospace New Power Technology Co. Ltd Shenzhen China Beijing institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

With the increase of power utilization rate of renewable energy systems and the profound studies of DC microgrids, DC distribution systems are getting more attention. To improve the quality of DC bus, it is necessary to consider the voltage fluctuations caused by loop switching such as battery management and maximum power output in the system. An optimization method is proposed to accelerate the switching process of multiple control loops, especially for multi-module expansion, which can improve the performance of dynamic response The proposed method just requires the addition of a few devices to the circuit structure and realizes nonlinear control, with which the conditional intervention only happens during transient processes without affecting the steady-state loop design. Compared with traditional methods, this method can achieve power expansion of the system as well as a quick response under load step or bus voltage overshoot.

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An Early Fault Detection Method of the Induced Draft Fan Based on Long-Short Term Memory Network and Double Warning Thresholds

An Early Fault Detection Method of the Induced Draft Fan Bas...

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第34届中国控制与决策会议

作者： Wei Wei You Lv Yizhuo Liu Qing Li Shisen Xu Jun Li School of Control and Computer Engineering North China Electric Power University Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power University Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process North China Electric Power University Huaneng Technology Innovation Center Xian Thermal Power Research Institute Company Limited

The induced draft(ID) fan is a significant piece of auxiliary equipment in thermal power *** early detection of possible faults in the ID fan may be used for effective predictive maintenance,thereby reducing the overall maintenance cost and improving the reliability and availability of thermal power *** paper proposed a genetic algorithm and long-short term memory network(GA-LSTM)-based condition monitoring approach using normal operation data of the ID ***,the LSTM network and the sliding window technique were introduced to construct double thresholds,which contains a dynamic threshold and a static *** GA-LSTM-double thresholds method was applied to a coal-fired power plant to achieve early fault detection and *** results demonstrates that the proposed method is capable of detecting minor anomalies in advance.

关键词： Early Fault Detection Long-Short Term Memory(LSTM) Genetic Algorithm(GA)

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Equivalent model of multi-type distributed generators under faults with fast-iterative calculation method based on improved PSO algorithm

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Protection and control of Modern power systems 2021年第1期6卷 371-382页

作者： Puyu Wang Jinyuan Song Fangyu Liang Fang Shi Xiangping Kong Guangen Xie Xiao-Ping Zhang Xinxin Gu School of Automation Nanjing University of Science&Technology(NUST)Nanjing210094JiangsuChina Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan250061China Jiangsu Electric Power Research Institute Jiangsu Electric Power CompanyNanjing211103JiangsuChina School of Engineering University of BirminghamEdgbastonB152TTBirminghamUK Nanjing GWDR Relays Technologies Co. Nanjing210032JiangsuChina

There are various types of distributed generators (DGs) with different grid integration strategies. The transient characteristics of the fault currents provided by the DGs are different to those of conventional synchronous generators. In this paper, a distribution network with multi-type DGs is investigated, including consideration of DG low-voltage ride through (LVRT). The fault current characteristics of two typical DGs, i.e. an inverter-interfaced distributed generator (IIDG) and a doubly-fed induction generator (DFIG), are analyzed, considering the specific operation modes. Based on analysis of the fault characteristics, an equivalent model of the multi-type DGs under symmetrical/asymmetrical fault conditions is established. A fast-iterative fault calculation method for enhancing the calculation efficiency while avoiding local convergence is then proposed using an improved particle swarm optimization (PSO) algorithm. A simulation system of the distribution network with multi-type DGs is established in PSCAD/EMTDC. The simulation results validate the high accuracy and calculation efficiency of the proposed calculation method of the fault components. This can assist in the settings of the protection threshold.

关键词： Multi-type distributed generators(DGs) Fault current characteristics Equivalent model Fast-iterative calculation method Improved particle swarm optimization(PSO)

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Variable Frequency Phase-Shift Modulation Technique for Single Stage Dual-Active-Bridge AC-DC Converter

Variable Frequency Phase-Shift Modulation Technique for Sing...

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International Conference on power Electronics (ICPE)

作者： Dongxin Guo Panbao Wang Chunguang Ren Josep M. Guerrero School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Department of Energy Technology Aalborg University Aalborg Denmark

This article proposes a variable frequency phase-shift modulation technique for single stage dual-active-bridge (DAB) AC-DC converter. This isolated single-stage single-phase converter consists of a DAB and a full bridge (FB) inverter. The proposed strategy applies a composite control strategy combining frequency modulation and extended phase shift (EPS) method to overcome the drawback of the non-linear power control of traditional phase-shift control scheme, which significantly reduces the complexity of the controller algorithm. Moreover, the synchronous inverter control applied to the back-end FB inverter is designed, which can realize the energy conversions in a single-stage, and a high frequency (HF) filter capacitor can replace the electrolytic capacitor at the output side DC-link. Thus, the safety of system operation improves and the power density of the system increases. Finally, simulation results confirm the validity and practical feasibility of the proposed control strategy.

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Analysis of Commutation Failure in LCC-HVDC systems during Unbalanced Conditions Using Sequence Components

Analysis of Commutation Failure in LCC-HVDC Systems during U...

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2021 International Conference on power system Technology, powerCON 2021

作者： Omer, Ahmed Wang, Xiaohui Xie, Zhenjian Li, Chen School of Electrical Engineering Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan250061 China Economic and Technological Research Institute State Grid Jiangsu Electric Power Co. Ltd. Nanjing210000 China

ISBN: (纸本)9781665407373

This paper takes close research on the impact of unbalanced faults in the occurrence of Commutation Failure (CF) in LCC-HVDC inverters, by finding the probability of CF with the phase shift that takes place in case of unbalanced faults. The analyses of the unbalanced system are conducted by using sequence components, a relationship between the phase shift and unbalance ratio is implemented to describe the degree of unbalance in the system. The unbalance ratio is used to quantify the amount of the phase shift that will cause CF in the system, and the probability of CF with respect to unbalance ratio is obtained. Moreover, a mathematical model is implemented to calculate the critical amount of unbalance degree that will cause CF in the system, with different faults applied, the relationship between commutation failure and phase shift is obtained. The mathematical model is verified using PSCAD/EMTDC. © 2021 IEEE.

关键词： HVDC power transmission

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Integrated Planning of Charging Piles and Battery Swapping Stations Considering Spatiotemporal Distribution of Electric Vehicles

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CSEE Journal of power and Energy systems 2022年第3期11卷 1236-1252页

作者： Liang Zhang Ruyi Huo Guowei Cai Koh Leong Hai Ling Lyu Peng Wang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China Energy Research Institute Nanyang Technological University Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore

With the rapid adoption of electric vehicles (EVs), more charging and battery swapping facilities are needed to meet growing demand. However, a single type of charging or swapping facility cannot simultaneously and efficiently satisfy the power supply requirements of diverse vehicle types. In order to solve this problem, a joint planning method of charging piles and charging-battery swapping stations (CBSSs) is proposed in this paper. In this method, the influence of geospatial constraints on the layout scale of charging piles is considered, and the Monte Carlo simulation method is used to predict the spatiotemporal distribution of charging and battery swapping demands of private electric vehicles (PEVs) and the battery swapping demands of taxi electric vehicles (TEVs) respectively. On this basis, the layout scale of charging piles of each functional area is determined during the maximum charging demand period in a day to meet the demands of PEVs for charging convenience. Then, an operating state model of CBSS is established for calculation of the objective function. At the same time, a planning model of CBSSs is established to minimize the annual social comprehensive cost, which takes into account the economy of CBSSs and the battery swapping convenience of EVs. The planning of CBSSs can meet the demands of TEVs and some PEVs for a rapid power supply. Finally, using the urban transportation network of Changchun and IEEE 33-node system as an example, the planning of charging piles and CCBSs in direct charging mode and peak shifting mode are simulated and analyzed. The simulation results show that the proposed method enables PEVs and TEVs to access convenient and rapid power supply, and the planning result of CBSSs in direct charging mode is more economical, while peak shifting mode is more conducive to the safe operation of distribution networks.

关键词： Batteries Planning Charging stations Decision making Costs Electric vehicles Capacity planning

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