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检索条件"任意字段=8th IEEE International Conference on Advanced Power System Automation and Protection, APAP 2019"

共 611 条记录，以下是81-90 订阅

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Analysis of Transient Characteristics in DC Distribution Network during Line Faults 8

Analysis of Transient Characteristics in DC Distribution Net...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Wang, Qiu Wang, Chao Wang, Fei Han, Minxiao Fan, Zikan State Grid Jiangsu Electric Power Design Consulting Co. Ltd China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source Beijing China

ISBN: (纸本)9781728117225

Medium and low voltage DC distribution are promising selection for future electric power supply. the transient characteristics analysis during line faults is of great significance for the design of relay protection system and the setting of protection device parameters. Two pivotal types of converters, MMC-based DC/AC converter and DAB-based bidirectional DC/DC converter, are studied under the condition of pole to pole short fault in bipolar DC distribution network. the equivalent circuit of these converters in different stages are then obtained and the fault voltage and current characteristics are theoretically analyzed. the impact of transition resistance and current limiting inductor are discussed in detail. the simulation model of DC distribution network is built based on PSCAD platform, which verifies the correctness of theoretical analysis. © 2019 ieee.

关键词： Equivalent circuits

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An Amplitude Comparison protection for Distribution Networks with High Permeability Inverter-Interfaced Distributed Generations 8

An Amplitude Comparison Protection for Distribution Networks...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Xu, Bin Gao, Houlei Huang, Jiakai Shandong University School of Electrical Engineering Jinan China

ISBN: (纸本)9781728117225

For distribution networks with high-permeability inverter-interfaced distributed generations (IIDGs), the fault characteristics of IIDG are firstly analyzed, then, a method for analyzing the maximum short-circuit current that can be provided by IIDGs in active distribution network is proposed. Furthermore, a novel integrated current amplitude protection principle is proposed by comparing the two ends of the line positive phase current amplitude which achieves low-cost and high-reliability compatibility. the model of 10kV active distribution network was built by PSCAD to comprehensively simulate the influence of different DG permeability, fault type, transition resistance and other factors on the protection principle. After theoretical analysis and simulation, it is proved that the scheme can accurately solve the fault location problems, the data used is simple, the resistance to transition resistance is excellent, and the ability of resisting synchronization error is strong. © 2019 ieee.

关键词： Electric inverters

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SREKF Based State of Health Estimation for Lithium-Ion Battery 8

SREKF Based State of Health Estimation for Lithium-Ion Batte...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhang, Zhiyu Zhang, Fengzhu Ma, Wentao Xi'an University of Technology School of Automation and Information Engineering Xi'an Shanxi Province China

ISBN: (纸本)9781728117225

State of health (SOH) estimation plays an important role in battery management system. this problem is addressed by introducing a second-order RC equivalent circuit model (ECM) and square root extended kalman filter (SREKF) in this work. According to the ECM, the ohmic resistance (R0) which represents the SOH is molded as a state vector, and lithium battery SOH is obtained by using the internal relationship between ohm resistance and SOH. then the state of the resulting nonlinear dynamic system is estimated in real time by the SREKF which can guarantee the symmetry and non-negative characteristics of the state variance matrix by the square root method recursively. the verification results show that the SREKF algorithm can estimate the SOH parameter more accurately and reduce the maximum error of the ohmic resistance by 6% under 1C-rate constant current test compared with the EKF algorithm. © 2019 ieee.

关键词： Extended Kalman filters

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HVDC Startup Strategy in AC/DC Hybrid system Black Start Process 8

HVDC Startup Strategy in AC/DC Hybrid System Black Start Pro...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Chen, Yuchen Shen, Chen Tsinghua University Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728117225

Reducing the power system restoration time has always been an important topic in power system research. For AC/DC hybrid systems, if the rapid regulation ability of HVDC is utilized in the early stage of black start, the restoration time can be reduced. this paper proposes a HVDC startup strategy while considering HVDC lines and explores their control flexibility in the black start process. the requirement on the minimum short-circuit ratio (SCR) is presented based on the concept of critical short-circuit ratio (CSCR) under non-rated state. the maximum transmittable power of HVDC is obtained using the short-circuit ratio of the system. the feasibility of the proposed HVDC startup strategy is proved through numerical simulation on the ieee 24-bus test system and the black-start scheme that including HVDC startup can significantly reduce the system restoration time. © 2019 ieee.

关键词： Restoration

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Design and Implementation of an Automated Test Framework for Electric power Data Network based on the Unified Resource Scheduling 8

Design and Implementation of an Automated Test Framework for...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Hu, Ting Li, Qin Huang, Xin He, Xiaoyang Nari Group Corporation/State Grid Electric Power Research Institute Nanjing210061 China

ISBN: (纸本)9781728117225

Traditional Electric power Data Network (EPDN) device tests are implied manually with the testing resources utilized separately. Such way of testing is of low efficiency and is difficult for the management of device resources. With the rapid increase of testing tasks in the future, improving the test efficiency and the resource utilization is of great importance to the development of EPDN. In this article, we propose a novel automated test framework for EPDN. In particular, we abstracts the related knowledge from data of real world experimental resources and testing business, based on the extracted knowledge, we combine virtualization technology with automated testing technology and software quality management, and proposes an automated test framework with unified scheduling of testing resources. the proposed framework is evaluated with the task of route flapping testing. the provided test flow and test results prove the feasibility and the effectiveness of the proposed framework. © 2019 ieee.

关键词： Virtualization

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Influence of power Factor on Small-Signal Stability of Grid-Connected Converter systems 8

Influence of Power Factor on Small-Signal Stability of Grid-...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Xu, Luyao Sun, Minghui Xin, Huanhai Song, Xiaozhe Wang, Chunhua Zhejiang University College of Electrical Engineering Hang Zhou China State Grid Jilin Electric Power Company Limited Chang Chun China

ISBN: (纸本)9781728117225

this paper proposes a novel admittance model for a grid-connected voltage-source converter (VSC) system in polar frame. In the admittance model, the power factor of VSC can be explicitly expressed and the influence of power factor on stability can be analyzed intuitively. Based on this admittance model, the grid-connected VSC system can be modelled as a single-input single-output (SISO) system. Moreover, from a small-signal stability perspective, we prove that when controllers' parameters are fixed, a change of the VSC's power factor can be equivalent to a change of the grid's impedance. the validity of the model and analysis is verified by simulation results. © 2019 ieee.

关键词： Electric power transmission networks

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A Unified Scheme for power system Transient Stability Simulation and Transient Stability Assessment 8

A Unified Scheme for Power System Transient Stability Simula...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Yang, Songhao Fan, Xinkai Zhang, Baohui Hao, Zhiguo Masahide, Hojo Xi'an Jiaotong University Department of Electrical Engineering Xi'an China Tokushima University Department of Electrical and Electronic Engineering Tokushima Japan

ISBN: (纸本)9781728117225

Transient stability assessment (TSA) is critical for power system stability analysis and control. Among all efforts to achieve TSA, the transient stability simulation(TSS) plays a fundamental role. In this paper, a unified scheme is proposed for TSS and TSA of numerous power system transient scenarios. the scheme mainly consists of two parts, which are responsible for TSS and TSA, respectively. In part 1, an enormous number of scenarios are automatically generated by Matlab codes and the PSD-BPA programs are called to perform simulations for each scenario. the interaction between the two platforms is harmonious and flexible, which greatly reduces the workload. In part 2, simulation results are analyzed to evaluate the transient stability of these scenarios. the work is efficiently and accurately achieved based on the phase-trajectory' concave-convexity method. the unified scheme is finally tested in the ieee 39-bus 10-machine power system, and the results show its high efficiency. © 2019 ieee.

关键词： MATLAB

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Droop Control for Multi-Terminal Fractional Frequency Transmission system with Offshore Wind Farm Integration 8

Droop Control for Multi-Terminal Fractional Frequency Transm...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhao, Boyang Wang, Xifan Wang, Xiuli Ning, Lianhui Ge, Jing State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781728117225

Fractional frequency transmission system (FFTS), which is also known as low frequency AC transmission (LFAC), is a very promising transmission scheme for offshore wind farm integration. this paper proposed a droop-based control method for communication-free coordination of converters in FFTS. Firstly, the concept and topology of Multi-terminal FFTS (MT-FFTS) for offshore wind farm integration is introduced. Secondly, the droop control of converters in MT-FFTS is designed. Finally, the droop control is implemented in a MT-FFTS case study in MATLAB/Simulink and the results shows that the proposed droop control is correct and effective. © 2019 ieee.

关键词： Offshore wind farms

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Study on the Influence of Large-Scale Wind power Integration on Transient Stability of power system 8

Study on the Influence of Large-Scale Wind Power Integration...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Mosi, L.I.U. Zhiyuan, S.U.N. Guangshi, L.I.U. Mingpo, L.I. Xiaoyin, Q.I.U. Guangxi Electric Power Grid Co. Ltd. Electric Power Research Institute Nanning China

ISBN: (纸本)9781728117225

With the increase of installed capacity of wind power and the increasing proportion of wind power in the power grid, all kinds of wind turbines will have more and more prominent influence on the safety and stability of power system. Different types of wind turbines with different capacity have different effects on the stability of power grid. In this paper, PSD simulation software is used to build a power grid with wind farms in a certain area. the influence of large-scale wind turbines connected to the grid on the transient stability of the power grid is studied according to different types, different capacities of the same type and different manufacturers of the same type of wind turbines. © 2019 ieee.

关键词： Wind turbines

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Precise Load Shedding Scheme Based on Ordered Tree Implicit Enumeration Method 8

Precise Load Shedding Scheme Based on Ordered Tree Implicit ...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Xu, Zhou Zhang, Junfang Cheng, Weijie Ren, Zuyi Nanjing University of Science and Technology School of Automation Nanjing China Shenzhen Power Supply Bureau Co. Ltd. Shenzhen China Nr Electric Co. Ltd. Nanjing China

ISBN: (纸本)9781728117225

With the continuous expansion of the scale of the power grid, the requirements for the rapidity and precision of the action of the load shedding device are continuously improved. In order to solve the load shedding optimization problem efficiently, this paper proposes a precise load shedding method based on ordered tree implicit enumeration method. this method coordinates the under frequency load shedding (UFLS) and under voltage load shedding (UVLS) action rounds, establishes the load shedding optimization model and the ordered tree branch diagram, and optimizes only within the feasible solution range according to the level of the load, which greatly improves the efficiency of calculating optimal solutions. the simulation shows that this method not only meets the requirements of the rapidity and stability of the load shedding system, but also improves the level of refinement of the load shedding control under the emergent situations. © 2019 ieee.

关键词： Forestry

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