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Synthetic quantitative assessment of power quality in competition market environment

Synthetic quantitative assessment of power quality in compet...

引用

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

作者： Yonghai Xu Lei Chen Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

A new method, which integrates the virtue of the probability and mathematical statistics with that of the fuzzy mathematics for power quality assessment, is proposed in this paper. The index showing an aspect of power quality is evaluated using probability and mathematical statistics respectively; the global unique index of these indexes can be obtained. The results obtained from each index unified are unified again using fuzzy synthetic appraisal in order to give an objective, overall and unique index of power quality. The special assessment method for voltage sag using the average sag energy index is also discussed. Finally, a transaction mode makes the maximum benefits for different unit commitment as objective function and takes the power quality into account is presented, and then power energy really becomes a commodity which would be evaluated a price according to power quality

关键词： power quality Voltage fluctuations Probability Statistics Mathematics power system harmonics Appraisal Algebra power markets power system economics

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Research on dynamic Mathematic Model of VSC − HVDC Based on Energy Conservation Principle

Research on Dynamic Mathematic Model of VSC − HVDC Based on...

引用

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

作者： Guangkai Li Gengyin Li Chengyong Zhao Haifeng Liang Ming Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Voltage source converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are validated by simulation on software PSCAD/EMTDC

关键词： Mathematics Mathematical model HVDC transmission Energy conservation Converters power conversion Voltage Energy conversion control system analysis control system synthesis

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Condition-Based Maintenance of Electrical Equipments Based on 1D3 Algorithm and Monte Carlo Stimulation

Condition-Based Maintenance of Electrical Equipments Based o...

引用

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

作者： Li Ran Chen Li Gu Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Condition-based maintenance is an advanced maintenance strategy which is based on the monitoring of equipments status and according to the results of monitoring and analysis people can arrange maintenance scientifically. When monitoring and analyzing the status of equipments, there are vast historical and on-line data to analyze. If we can find the main factors leading to equipment failure through analyzing the data and pay more attention to these factors, we can make maintenance decision more exactly and quickly. In this paper we propose to apply ID3 algorithm to classify the data according to the importance of their influence to equipment failure and then find the factors which influence equipments most. After finding the most important factors, apply Monte Carlo simulation to forecast the probability of equipment failure which occurs in their operational life span, and according to this we can pay more attention to monitor the factors which result in failure easily

关键词： Monte Carlo methods Condition monitoring Maintenance Equipment failure Data analysis Data mining Algorithm design and analysis Failure analysis power system reliability Time series analysis

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Analysis and control of Wind Farm Incorporated VSC-HVDC in Unbalanced Conditions

Analysis and Control of Wind Farm Incorporated VSC-HVDC in U...

引用

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

作者： Ming Yin Gengyin Li Ming Zhou Yong Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

With increasing attention to sustainable development and environmental protection, more and more countries turn to wind energy to reduce their dependence on traditional fossil fuel energy. Among the new challenges with this trend is how to integrate wind farm with existing AC network more effectively. The paper presents a possible measure based on VSC-HVDC, namely so-called wind farm incorporated VSC-HVDC (WVSC-HVDC). In the paper the wind farm along with an AC grid supplies to a passive network. The paper firstly introduces VSC-HVDC, and then presents a space vector based control strategy for supplying to a passive network. The rectifier controls DC voltage and reactive power that is needed by the wind farm. The inverter controls the AC bus voltage in the passive network. Simulations using PSCAD/EMTDC are performed to study the steady and transient behaviors of WVSC-HVDC. With harmonics analysis, the simulation results will be helpful for further understanding of the operation characteristics of WVSC-HVDC and its protection design

关键词： Wind farms Passive networks protection Voltage control Sustainable development Wind energy Fossil fuels Rectifiers Reactive power control Inverters

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Condition-based maintenance of electrical equipments based on ID3 algorithm and Monte Carlo stimulation

Condition-based maintenance of electrical equipments based o...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Li, Ran Chen, Li Gu, Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric PowerPower University Baoding 071003 Hebei Province China Department of Electrical Engineering North China Electric Power University North China Electric Power University

ISBN: (纸本)0780391144

Condition-Based Maintenance is an advanced maintenance strategy which is based on the monitoring of equipments status and according to the results of monitoring and analysis people can arrange maintenance scientifically. When monitoring and analyzing the status of equipments, there are vast historical and on-line data to analyze. If we can find the main factors leading to equipment failure through analyzing the data and pay more attention to these factors, we can make maintenance decision more exactly and quickly. In this paper we propose to apply ID3 Algorithm to classify the data according to the importance of their influence to equipment failure and then find the factors which influence equipments most. After finding the most important factors, apply Monte Carlo Simulation to forecast the probability of equipment failure which occurs in their operational life span, and according to this we can pay more attention to monitor the factors which result in failure easily. © 2005 IEEE.

关键词： Electric equipment

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Data Mining Used For the Assessment of the Ability of Bidding Units

Data Mining Used For the Assessment of the Ability of Biddin...

引用

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

作者： Li Ran Li Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various factors is illustrated the procedure of finding association among many factors and then obtained the rules to assess bidding units ability. The rules are very useful in supporting the generating bidding unit to make decisions and helping the electric agency (power exchange-PX) and (independent system operator-ISO) to design an optimal trade plans

关键词： Data mining power generation power markets Economic forecasting power generation economics ISO Industrial control Radio access networks Demand forecasting power system economics

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Research on Super Capacitor Energy Storage system for power Network

Research on Super Capacitor Energy Storage System for Power ...

引用

International Conference on power Electronics and Drive systems (PEDS)

作者： Jiancheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented, which is mainly composed of three parts: the electrical double-layer capacitors array that stores energy, the AC/DC-DC/AC power converter system and the integrated control system composed of microprocessors. Application studies of the SCES system for active power supply, voltage control, voltage oscillation elimination and harmonic elimination are described. The stability and control effect of the system relation to the node impedance are analyzed in detail. This paper also presents studies on experiments of the SCES system synchronous and re-synchronous operating with power network when grid fault and recovered.

关键词： Capacitors Energy storage Supercapacitors Distributed control DC-DC power converters Centralized control Microprocessors power supplies Voltage control power system harmonics

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Determination of Total Transfer Capability Incorporating FACTS Devices in power Markets

Determination of Total Transfer Capability Incorporating FAC...

引用

International Conference on power Electronics and Drive systems (PEDS)

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

It is very important and necessary to calculate total transfer capability (TTC) incorporating flexible alternate current transmission system (FACTS) devices in power markets and analyze impacts of FACTS on TTC. Calculating TTC incorporating with FACTS devices is an optimal problem constrained by some equalities and inequalities. This paper proposes a mathematical model for calculating TTC incorporating with FACTS devices in power markets, and detailed calculation method is also put forward. The constraints include voltage constraints, thermal stability limits, generator's capacity limits, load demand, steady-state power flow, and control parameter constraints of FACTS devices, etc. The sensitivity-based repetitive linear iterative approach is proposed to solve the proposed model. The detailed solution process is described in this paper. To realize the proposed model and calculation method, a TTC calculation software incorporating with FACTS devices is developed based on PSASP/UPI, a set of advanced application software package developed by China Electric power Research Institute. This paper proposes a new approach on combined TTC solution including FACTS and power flow calculation based on PSASP/UPI, and gives the interface program for user programming interface (UPI) in PSASP. The IEEE 14-bus test system is used to verify the proposed algorithm and program. Numerical results show that FACTS devices and their locations have different impacts on TTC, also prove that the proposed model and algorithm is correct and effective

关键词： power markets Flexible AC transmission systems Load flow Mathematical model Thermal loading Thermal stability power generation Steady-state Voltage control Iterative methods

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power quality control center and its control method

Power quality control center and its control method

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Li, Peng Bai, Qian Zhao, Baoli Yang, Yihan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Baoding Baoling Iranstornier Co. Ltd. Baoding Hebei Province China

ISBN: (纸本)0780391144

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∞control technology is used to realize the synthesis tracking compensation of voltage and current for UPQC. Finally its validity has been testified successfully. © 2005 IEEE.

关键词： power control

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Decomposition on Pollution Current of Load Emitting and Analysis of Its Influence on power Price

Decomposition on Pollution Current of Load Emitting and Anal...

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

作者： Xiufang Jia Chengyong Zhao J. Suo Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price

关键词： Pollution power quality Reactive power power system harmonics Costs Nonlinear distortion Educational programs Voltage power system analysis computing Performance analysis

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