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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security Monitoring Control"

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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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Probabilistic estimation of PCC loss due to voltage sags in large power systems

Probabilistic estimation of PCC loss due to voltage sags in ...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

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

ISBN: (纸本)9781424449347

In this paper probabilistic estimation of PCC loss is approached in distribution systems. For the difficulty of directly solving the impedances of the star-connected equivalent model, a port-based model is adopted for voltage magnitude calculation under four fault types (TPF, SLGF, LLF and DLGF). The specific energy (SE) function is used to evaluate voltage sags involving the voltage magnitude and sag duration simultaneously, and PCC loss is directly computed from the trip probability density, which derives from the normal probability distribution function of SE. The distribution characteristic of balanced and unbalanced faults is also considered. The estimation method for PCC loss is proved fast and effective by IEEE RBTS system.

关键词： power quality power systems Voltage fluctuations Circuit faults power system protection power system faults power system simulation power system modeling Impedance Probability

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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 ...

引用

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

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

引用

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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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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Design of integrative fuzzy logic damping controller of VSC-HVDC

Design of integrative fuzzy logic damping controller of VSC-...

引用

IEEE PES power systems Conference and Exposition, PSCE

作者： Sheng Li Jianhua Zhang Guohua Zhang Jingfu Shang Mingxia Zhou Yinhui Li 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 design an integrative ancillary fuzzy logic controller for the Voltage Source Converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/ DC system by damping the oscillation effectively after disturbance. The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. No detailed model of the system is required for the design of the proposed control scheme. The controller judges the operation states and the control effect and synthetically adjusts its active power and reactive power order in an adaptive way by using fuzzy rules, so as to damp out the area mode oscillation. An IEEE 4-generator AC/DC power system is built in PSCAD. Integrative ancillary fuzzy logic controllers is designed in Matlab and interfaced with PSCAD. Simulation results have shown that the integrative controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.

关键词： Fuzzy logic Damping PSCAD Converters power conversion power system stability power system interconnection power system simulation power system dynamics Robust stability

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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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Comprehensive assessment of voltage sag considering reliability and economy

Comprehensive assessment of voltage sag considering reliabil...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Xiaodong Yang Guodong Li 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

ISBN: (纸本)9781424449347

The reliability of electricity supply is required by users increasingly, and whether to invest the reliability and voltage quality has been a point of contention. Thus, the assessment of voltage sag becomes acute. In this paper, the acceptable indices considering system performance and user characteristics are proposed for comprehensive assessment of voltage sag, including the reliability of the system and economy of users. The comprehensive assessment strategy, based on analytic hierarchy process (AHP), is applied to the assessment process for integrate the independent variables of the indices function. All the factors of users can be collected accurately from historic data, and the effectiveness of the method proposed in this paper is proved by the analysis of IEEE RBTS system.

关键词： Voltage fluctuations power supplies power quality power system reliability Frequency Economic indicators IEEE members system performance power generation economics Impedance

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Simulation recurrence of a realistic DC line fault based on RTDS and its simulation reliability analysis

Simulation recurrence of a realistic DC line fault based on ...

引用

IEEE PES power systems Conference and Exposition, PSCE

作者： Xudong Jia Gengyin Li Chengyong Zhao Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

In this paper, the equivalent model of a local HVDC transmission system is set up based on Real-Time Digital Simulator (RTDS). A realistic DC line fault on the pole 2 of the HVDC project is simulated successfully by use of the RTDS model connected with actual physical control and protection devices. And then, a complete evaluation theory of simulation errors is proposed. In the theory, residuals similarity is used to characterize the global error of dynamic simulation, and frequency, damping and amplitude similarity are used to characterize features errors respectively. The comparison analysis has been carried out between the simulation results and the fault recordings by the simulation similarity computation procedure based on LabVIEW. It is proved that the simulation results of existing models are almost the same as the fault recordings, and the simulation model of HVDC transmission system established can reflect operation characteristics of real network exactly. The realistic faults can be reproduced by the simulation experiment accurately.

关键词： Analytical models power system simulation Computational modeling Circuit faults HVDC transmission Circuit simulation power system reliability power system modeling IEEE members Testing

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Simulation Research on the Multiple Objective Voltage Quality Regulator

Simulation Research on the Multiple Objective Voltage Qualit...

引用

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

作者： Yajing Di Zhongdong Yin Xiangning Xiao Zhi Zhang Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education Beijing China

Due to the complexity of power systems combined with other factors such as increasing susceptibility of equipment, power quality (PQ) is apt to waver. With electricity in growing demand, low PQ is on the rise, the method of resolve those problem about power quality must be considered. In accordance with the familiar PQ problem, such as voltage sag, voltage swell, short interruption of supply voltage, harmonic suppression and short circuit fault. Basing on the H bridge cascade connection method, this paper design a new type regulator for the multiple objective control. Through the simulation software of PSCAD/EMTDC, the device can resume the voltage and restrain the harmonic dynamically and effectively, when there are voltage disturbances in the power system side. This device also could confine the short circuit current to a supportable level, when there is short circuit fault in the load side.

关键词： Regulators power system simulation PSCAD Voltage fluctuations power quality Circuit faults power system harmonics Harmonics suppression Bridge circuits Design methodology

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