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A protection scheme for phase-to-phase faults based on spectrum characteristic of fault-generated high-frequency transient signals

A protection scheme for phase-to-phase faults based on spect...

引用

IEEE General Meeting power& Energy Society

作者： S. F. Huang X. G. Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

When a fault occurs on a transmission line, fault-generated high-frequency signals contains a lot of information about fault. This paper proposes a protection scheme for phase-to-phase fault in transmission line based on spectrum characteristic of fault-generated high-frequency signals. The difference of fundamental natural frequencies in both ends of transmission line is used to determine whether a fault is internal or external. The scheme can reduce trip time if the fault is an internal fault and does not misoperate if the fault is external. It also can identify chose-up faults. The scheme performance was proven using power system Computer Aided Design (PSCAD) in 500-kV power system considering critical fault cases.

关键词： power system transients power transmission lines Frequency domain analysis Fault diagnosis power system protection PSCAD Voltage Fault detection Frequency measurement Bandwidth

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Approach on performance evaluation and index selection for electricity distribution utilities

Approach on performance evaluation and index selection for e...

引用

IEEE General Meeting power& Energy Society

作者： Ming Zhou Weijun Zhai Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Establishing an effective performance evaluation method and market driven incentive mechanism is an important subject that the electric power utilities are currently facing with. By aid of Data Envelopment Analysis (DEA) method which is widely used in other industries' performance evaluation, three DEA based models are proposed to evaluate electricity distribution utilities' performances, the relative efficiency scores are then given. In addition, the improvement schemes are presented for those relative less efficient utilities. At last, an approach of sensitivity analysis with respect to evaluation indices and a method to simplify evaluation indices are presented. The empirical study shows that the proposed performance evaluation method for electricity distribution utilities is effective and straightforward.

关键词： Data envelopment analysis Performance evaluation Sensitivity analysis power system analysis computing Monopoly power system management power system economics power generation economics Regulators Logistics

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Fault Diagnosis Based on BFS in Electric power system

Fault Diagnosis Based on BFS in Electric Power System

引用

International Conference on Measuring Technology and Mechatronics Automation, ICMTMA

作者： Yagang Zhang Jinfang Zhang Jing Ma Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

In this paper, we adopt a novel topological approach to fault diagnosis. In our researches, global information will be introduced into electric power system, we are using mainly BFS of graph theory algorithms to resolve fast and exact discrimination of faulty components and faulty sections, and finally accomplish fault diagnosis. Graph theory algorithms can be used to model many different physical and abstract systems such as transportation and communication networks, models for business administration, political science, and psychology and so on. In the study of fault diagnosis in electric power system, especially the fault diagnosis for mechanically-driven sections of equipments in power plant, graph theory algorithms must also have a good prospect of application.

关键词： Fault diagnosis Graph theory RLC circuits Voltage Circuit faults Resistors Electric variables measurement power system dynamics power system modeling Instruments

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Fault detection based on discriminant analysis theory in electric power system

Fault detection based on discriminant analysis theory in ele...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Yagang Zhang Jinfang Zhang Jing Ma Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424449347

In the control of electric power systems, especially in the wide area backup protection of electric power systems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be detected quickly and defined exactly. In our researches, global information will be introduced into the backup protection system, basing on discriminant analysis theory of multivariate statistical analysis theory, we are going to seek after for the statistical laws of electrical quantities' marked changes by analyzing and computing real-time PMU measurements, so that we can carry out fast and exact identification of faulty components and faulty sections, and finally accomplish fault isolation. Multivariate statistical analysis theory is an efficient theory that can resolve different kinds of complex problems. It has been applied successfully to many researches of various fields. Discriminant analysis is an important theory in multivariate statistical analysis theory. A common approach to discriminant analysis is to apply the decision theory framework. In the study of electric power systems, discriminant analysis theory must also have a good prospect of application.

关键词： Electrical fault detection power system protection Statistical analysis power system reliability Information analysis power system control control systems Fault location Real time systems Phasor measurement units

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power Equations and Non-Detection Zone of Passive Islanding Detection and protection Method for Grid Connected Photovoltaic Generation system

Power Equations and Non-Detection Zone of Passive Islanding ...

引用

Pacific-Asia Conference on Circuits, Communications and systems, PACCS

作者： Zengqiang Mi Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

Islanding detection and protection is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over/under voltage protection (OVP/UVP) and over/under frequency protection (OFP/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in point of common coupling (PCC) such as voltage amplitude and frequency and then cause the inverter to shut down when there is sufficient transition from normal specified conditions. The real and reactive power equations and Non-Detection Zone (NDZ) of OVP/UVP and OFP/UFP methods for grid connected PV system are derived and analyzed in this paper. Analyses show that the behavior of the system at the time of disconnection will depend on the imbalance power at the instant before the switch opens to form the island, these results also indicate the NDZ of OVP/UVP and OFP/UFP methods is considerable large and the reaction times for these protective methodologies may be variable or unpredictable.

关键词： Equations power system protection Photovoltaic systems Solar power generation Mesh generation power generation Voltage Frequency Inverters Switches

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Technology Research of Novel Energy Storage control for the PV Generation system

Technology Research of Novel Energy Storage Control for the ...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Jinhui Xue Zhongdong Yin Bingbing Wu Ziping Wu Jun Li Key Laboratory of Power System Protection and Dynamic Security Monitoring And Control under Ministry of Education North China Electric Power University Beijing China

Recent years, technologies for new energy have developed rapidly since the energy crisis and the environmental pollution got worse. And the solar energy generation technology tends towards the stage of a large number of applications in engineering from the research stage. This paper designed a grid-connected PV system firstly, then introduced the operation principle of the various parts as well with the control strategy of the power flow. The design of energy storage is of great significance as the output power of PV cells array is greatly affected by the light intensity and the temperature change. Battery is used as the energy storage device normally in the traditional energy storage system. In this paper, it used the Ultracapacitor as the energy storage device after comparing with the battery, and designed the charge-discharge control strategy according to the characteristics of the ultracapacitor. Finally it verified the feasibility of the energy storage control strategy through the simulation models which was built based on the PSCAD/EMTDC platform.

关键词： Energy storage control systems Solar power generation Batteries Supercapacitors Pollution Solar energy power engineering and energy Load flow power generation

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A novel approach on ATC determination for AC/DC transmission systems

A novel approach on ATC determination for AC/DC transmission...

引用

IEEE General Meeting power& Energy Society

作者： Ning Ji Yajing Gao Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With the increasing expansion of AC/DC transmission system scale, the research on available transfer capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. However, most of the present researches on the ATC calculation are only suitable for AC transmission system, few is about the ATC analysis for AC/DC systems. In this paper a novel ATC calculation model for AC/DC transmission systems is proposed, and alternate iterative continuation power flow algorithm is presented to solve this model. ATC of an AC/DC transmission system is computed considering the impacts of DC control system on ATC and compared to one of the AC system. The algorithm based on MATLAB6.5 is developed. The modified IEEE 14-bus test system is used to verify the presented approach.

关键词： power system reliability Load flow power system interconnection power system modeling Iterative algorithms control systems Mathematical model Voltage power system dynamics power system security

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Adequacy evaluation of wind farm integration in power generation and transmission systems

Adequacy evaluation of wind farm integration in power genera...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Shuo Zhang Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The integration of a large number of wind farms will have a significant impact on the reliability performance of the electric generation and transmission systems. In this paper, an adequacy evaluation model of wind power integration in power system based on the sequential Monte-Carlo simulation approach is presented. This model is applied to simulate power system including wind power generation. Depth first search algorithm is used to find out each connected block of network. In the section of active power correction and dispatching, a reduction of load minimum as goal function linear programming model is presented. Corresponding software is programmed according to the Matlab7. The calculations to IEEE-RTS79 test system which wind farm model added is carried out. The reliability index from calculated examples show the value of wind power, and will provide the valuable reference for wind farm operation and planning.

关键词： Wind farms Wind energy generation Wind power generation power system modeling power system reliability Mathematical model power system simulation Wind energy Dispatching Linear programming

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A new technology for HVDC start-up and operation using VSC-HVDC system

A new technology for HVDC start-up and operation using VSC-H...

引用

IEEE General Meeting power& Energy Society

作者： Chunyi Guo Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper proposed a new technology for HVDC start-up and operation using VSC-HVDC system. The new concept of the technology is to start HVDC when its receiving side is passive network. The motivation of choosing this technology is to enable HVDC to operate under small amount of power delivery condition as the receiving side is passive network. A physical model of starting HVDC by VSC-HVDC is developed. Moreover, a control system is designed in dq reference frame. In order to testify this technology, the dynamic performance of starting HVDC using VSC-HVDC is investigated. Simulation results obtained using PSCAD/EMTDC show that with the use of the proposed technology, the HVDC system can start successfully and feed small amount of power to passive network. The technology proposed exerts the advantage of VSC-HVDC system and increases the availability ratio of supplying power to passive network.

关键词： HVDC transmission Passive networks power system modeling control systems Testing power system dynamics PSCAD EMTDC Feeds power supplies

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A qualitative identification method for information assets of substation automation systems

A qualitative identification method for information assets o...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Nian Liu Jianhua Zhang Xu Wu Hao Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

Information security risk assessment combined with power control process is not a properly resolve problem, the lack of asset identification method accord with characteristics of power information systems is one of the main factors. Network-based substation automation systems (SAS) are typical power information systems, based on the analysis of difficulties on asset identification, a complete information asset identification method is introduced from three aspects, includes asset classification, task identification, and asset valuation. In the asset classification, combined with the IEC 61850 standard, a structured asset model is defined based on association of actual intelligent electronic devices and virtual logical nodes. In the task identification, take functions of substation automation as the object of task, the concept of function graph is defined to reflect the logical relations between functions and assets, as well as the logical relation between the assets. In the asset valuation, two levels of asset value include function level and substation level, are defined to quantify the information security properties of assets and the effects of possible accidents. Finally, an evaluation instance is constructed from IEC 61850 standard, the proposed method is applicable to asset identification of network-based SAS.

关键词： Substation automation IEC standards Information security Information systems Synthetic aperture sonar Cost accounting Risk management power control Information analysis power system modeling

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