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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Song Shaoqun Zhu Yongli Huang Min Yu Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China North China Electric Power University Baoding China

This paper presents a multi-agent and WAN based adaptive coordinated protection system (MAWBACPS). The system utilizes IP intranet to realize real-time wide area information exchange of a power system. Multi-agent system's several good qualities to solve distributing problems are used to realize the coordination of the operation settings of protective relays. A new idea of effortful adaptation for power system protection is proposed, and a new method to determine adaptive coordinated relay settings of lines are proposed in this paper. Moreover, the structure, communication mechanism and coordination control strategy of MAWBACPS, and relating agents' design are presented. Experiment results illustrate that MAWBACPS can realize the coordination of protections, enable the back-up relays to use their adaptive settings in most situations, and efficiently improve the security of power system

关键词： Wide area networks Adaptive systems power system protection power system relaying Protective relaying power system reliability power system security Communication system control Communication system security Substation protection

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The Research of Electric Appliance Running Status Detecting Based on DSP

The Research of Electric Appliance Running Status Detecting ...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Baoshu Li Chao Quan Shutao Zhao Weiguo Tong Peng Tao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China North China Electric Power University Baoding China

A new load detection method was presented based on its running status of power system. The loads are sorted according to their index of capacitive, inductive, and none-linear. The static character of each load was got according to the time-distribution. The concept of load detection is completed. The data-sample and wave recording equipment is designed and assembled based on the DSP for power loads status detecting. The superior software was designed for data management and analyzing. The recognizing status data was analyzed in both time-domain and frequency-domain; the identifying method for electric power loads status is deduced based on the correlation coefficient; the mathematical model for the status identifying is built; the trueness and validity of the methods is verified based on the testing and analyzing

关键词： Home appliances Digital signal processing Data analysis power systems Assembly Software design Time domain analysis Frequency domain analysis Mathematical model Testing

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Fourier series method on eliminating narrow frequency noise in partial discharge detection

Fourier series method on eliminating narrow frequency noise ...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Yangchun Chen Chengrong Li Wei Wang North China Electric Power University Beijing China Beijing Key Laboratory of High Voltage and EMC Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Beijing China

A new method to eliminate periodical narrow frequency noises in partial discharge detection of electric power system apparatus, Fourier series method, is presented. It uses the difference not only on frequency domain but also mainly on time duration between signals and noises. The anti-interference effect of this method was analyzed by experiments data on field. Several factors that can make influence to the affect of this method, such as the error of frequencies of the noise, the data length by which the Fourier coefficients are calculated, the error of A/D conversion, were discussed respectively. It was found that this method can almost completely banish narrow frequency noises, at the same time can retain the amplitude and polarity of partial discharge pulses, even if the main frequency of the partial discharge pulses are close to that of narrow frequency noises. The affect of this method was also contrasted with normal method, such as digital filter, adaptive filter and wavelet. The result shown that this new method has obvious predominance at remaining the amplitude and polarity of pulse signals.

关键词： Fourier series Partial discharges Pulse power systems Low-frequency noise Laboratories Frequency domain analysis Noise level Digital filters Adaptive filters power system harmonics

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Data Envelopment Analysis Based Strategy of Assessing Schemes for power system Black Start

Data Envelopment Analysis Based Strategy of Assessing Scheme...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Liu Yan Gu Xueping Zhang Dan Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Dispatching Center of Yunnan Power Company Kunming China

Restoration of a power system after a complete blackout is a very important issue to the safety of the power system. Reasonable black start schemes are necessary to restore the power system as soon as possible. Based on data envelopment analysis, a new strategy for assessing black start schemes is proposed in this paper. Schemes' technical verification is taken into consideration in the process of the assessment. Whether a scheme is effective is defined by employing its input and output indexes' values entirely. The application to a practical power system verifies that the method could provide dispatchers more comprehensive and objective decision references

关键词： Data envelopment analysis power system analysis computing power system restoration power system reliability power system protection power system economics power system faults power system measurements Safety control systems

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power Quality control Center and Its control Method

Power Quality Control Center and Its Control Method

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Peng Li Qian Bai Baoli Zhao Yihan Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Baoding Baoling Transformer Company Limited Baoding Hebei China

power quality becomes an emphasis of related researches. Based on the detailed study on QCC (quality control center) of the FRIENDS first advanced by Japanese scholars, the functions of QCC are expanded and its basic types and structures are defined. Meanwhile, by detailed study, this paper introduces the multiple adjusting functions of UPQC (unified power quality conditioner) which is the chief part of QCC and presents its typical topological circuit. Moreover, H infin control technology is used to realize the synthesis tracking compensation of voltage and current for UPQC. Finally its validity has been testified successfully

关键词： power quality power supplies power system reliability Automatic control Energy management Quality management Communications technology Quality control power system management power generation economics

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A new ultra high-speed protection scheme based on wavelet analysis

A new ultra high-speed protection scheme based on wavelet an...

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International power Engineering Conference (IPEC)

作者： Ming-yu Yang Wan-ye Yao Zeng-ping Wang Ju Zhang Yan-jun Jiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Automation Department North China Electric Power University Baoding Hebei China

ISBN: (纸本)9810557027

A new ultra high-speed protection scheme is proposed in this paper. Using wavelet transform with multiresolution analysis, the current signals is decomposed into a series of detailed wavelet components. The spectral energies of the wavelet components are calculated and then employed to detect the faults. Characteristics of the proposed ultra high-speed protection algorithm are analyzed and results of simulation studies are given. The results show that the proposed algorithm is promising and easy to implement for computer relaying application

关键词： protection Wavelet analysis Wavelet transforms Multiresolution analysis Fault detection Algorithm design and analysis Computational modeling Analytical models Computer applications Protective relaying

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A new protection algorithm for EHV transmission line based on singularity detection of fault transient voltage

A new protection algorithm for EHV transmission line based o...

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International power Engineering Conference (IPEC)

作者： Ming-yu Yang Wan-ye Yao Zeng-ping Wang Yan-jun Jiao Ju Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Baoding Hebei China Automation Department of North China Electric Power University Baoding Hebei China

ISBN: (纸本)9810557027

A new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines is presented in this paper. The singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500 kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions

关键词： Transmission lines Fault detection power system transients Voltage power system protection power transmission lines Wavelet transforms Circuit faults Signal detection Frequency

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Risk Management on Long-term Electricity Purchase Allocation in China power Markets

Risk Management on Long-term Electricity Purchase Allocation...

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International Conference on power Electronics and Drive systems (PEDS)

作者： Ming Zhou Gengyin Li Yanli Nie Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry ofEducation North China Electric Power University Baoding Hebei China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

This paper presents an integrated framework for the optimal management of electricity purchase allocation and risk for load service entities (LSEs). To the practice of China power Markets, we propose the framework of power portfolio of combined physical forward contract and spot market. The framework suggests that the forward contracts should have different prices on-peak and off-peak in accord with sale prices distinguish on-peak and off-peak. The optimal purchase problem is described by the utility maximum integrated the rate of return and risk tolerance level, and risk is evaluated by Value at Risk (VaR). The analytical solution is also conducted. The numerical results are reasonable with higher rate of return and better risk hedging compared with the corresponding results from the existing portfolio selection approach. The presented framework gives one possible and effective method for the optimal power portfolio and risk management in incomplete power markets.

关键词： Risk management power markets Portfolios Forward contracts Electricity supply industry Pricing Marketing and sales Energy consumption power generation Scheduling

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power Quality Disturbance Detection Based on Mathematical Morphology and Fractal Technique

Power Quality Disturbance Detection Based on Mathematical Mo...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Gengyin Li Ming Zhou Yan Luo Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

Based on mathematical morphology and grille fractal, a novel approach on power quality disturbance detection and location is presented in this paper. At first a parallel composite morphological filter with multiple-structure elements is designed to filter the random noise and impulse noise in power quality disturbance signals. Then to the filtered curves, an easy implementation criterion for singularity detection based on the change regularity of grille fractal is proposed to locate the start and end time that disturbance occurs. The voltage sag, swell, harmonic and their combined disturbances are used to verify the validity of the proposed filter-location approach. Numerical results show that the proposed approach is valid and effective

关键词： power quality Morphology Fractals power harmonic filters Signal sampling Signal analysis Shape Educational programs Noise shaping Voltage fluctuations

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Real time detection method for any integral harmonic voltage based on instantaneous reactive power theory

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2005年第18期25卷 70-73页

作者： Sun, Cai-Hua Zong, Wei He, Lei Du, Ning Li, Hai-Yan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

In order to implement real time detection of harmonic voltage, a method for any harmonic voltage detection based on instantaneous reactive power theory was presented. In the detection the standard current signals were additional, so the detection precision was not affected by the distorted system current and the detection results could also reflect the changes of frequency shift. To make the dynamic response speed quicker, an algorithm with feedback compensation was presented. The simulation results show that the algorithm can quicken the dynamic response speed effectively, the feedback compensation value also has a bigger effect on the response speed and detection precision, and the detection performance are not affected by frequency shift.

关键词： Signal detection

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