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Synthetic evaluation of power quality based on entropy of relative intensity and local variable weight

Synthetic evaluation of power quality based on entropy of re...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Li, Guodong Li, Gengyin Fu, Xueqian Zhou, Ming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China School of Electrical and Electronic Engineering North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9781424459407

A new method of power quality synthetic evaluation based on relative intensity entropy and local variable weight is presented in the paper. This method firstly uses the relative intensity entropy theory to extract the weights of the individual power quality indicators, and then does synthetic evaluation to the power quality data combined with the method of local state variable weight to amend the index weights, and gives the assessment point levels of their power quality. This new evaluation method embodies the gradual change of objective evaluation index weights with indicators values, and could do incentives and penalties to some weights of internal indicators. The simulation results show that the method proposed in this paper is more suitable for power quality evaluation, and has more practical significance. ©2010 IEEE.

关键词： power quality

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Research on the controller and human-computer interface for the voltage disturbance device

Research on the controller and human-computer interface for ...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shuhong Kong Zhongdong Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424450459;9781424450466

How to solve power quality problems is a research focus recently. It's of great significance to research and design the voltage disturbance device for the voltage compensation device's development and various experimental verifications. The all-digital controller is based on DSP and FPGA. The human-computer interface is designed by LabVIEW, a graphical software development environment most widely used in test, control and design fields currently. LabVIEW program runs on IPC and VISA technology is applied to realize the serial communication with DSP to control the device operation. Menu-driven interface is designed according to a novel design pattern combined with the state machine and the event structure. Based on the data signal processing technology and flexible graphical panel interface of LabVIEW's advantages, voltage disturbance experiments such as the voltage sag and swell, over voltage and under voltage, voltage fluctuation and flicker, voltage unbalance, harmonic and complex disturbances are carried out. In this paper, the working principle and design procedure of human-computer interface are researched. The verification tests are carried out to explain the functions. It's a successful application case of LabVIEW.

关键词： Voltage control Control systems Voltage fluctuations Rectifiers power quality Pulse width modulation inverters Monitoring Communication system control Digital signal processing power system harmonics

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Auxiliary frequency control of HVDC systems for wind power integration

Auxiliary frequency control of HVDC systems for wind power i...

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International Conference on Critical Infrastructures, CRIS

作者： Jing Hu Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

As a promising renewable resource, wind power is highly expected to contribute a significant part of generation in power systems in the future, but this also brings new integration related power quality issues due to its unconventional characteristics. To solve frequency fluctuating problems of wind power integration, this paper proposes an idea that it is possible and reasonable to use HVDC lines with auxiliary frequency control(AFC) to stabilize the frequency fluctuation caused by wind power, which could increase the rate of wind power integration not only, but also reduce intra-region reserve capacity and wind power cost. Furthermore, an improved frequency control strategy of HVDC is proposed. The simulation results show that the substitution of wind power frequency control reserves with the HVDC connection is possible without additional equipment and without causing large disturbances in both sides.

关键词： Frequency control Wind power generation HVDC transmission Fluctuations Inverters Rectifiers

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An improved grey model for forecasting spot and long term electricity price

An improved grey model for forecasting spot and long term el...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Zheng, Yanan Li, Gengyin Zhou, Ming Lin, Shan Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424459407

With the deepening reform to power industries, power systems are going to gradually open the demand side and the power consumers have to face the changes of their role in the market, and make a preliminary long-term forecasting for the electricity prices. In order to consider the relations between the spot market and the long-term contract market, this paper builds a multi-electricity price grey model to comprehensive forecast the prices of the 2 markets;further researches the structure of the background value, and improves the multi-electricity price grey model;and introduces the residual error, the related grade, the mean variance ratio and the little probability of error as test indexes. The test results show that the multi-electricity price grey forecasting model and its improved model have better accuracy, and the improved model has stronger adaptability and extends the application range. ©2010 IEEE.

关键词： Forecasting

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Design of voltage unbalance generating device based on negative sequence injection method

Design of voltage unbalance generating device based on negat...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shuhong Kong Zhongdong Yin Chengxin Dai Qiu Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

Single-phase large-capacity loads, such as electrified railways, electric arc furnaces, welding machines and so on, will exert influences on the power quality of the power system. As one important problem of them, three-phase unbalance may thereby endanger the safety of various types of electrical equipments. In this paper, reasons and hazards of three-phase unbalance are analyzed. According to the measurement method based on symmetrical components, the three-phase unbalanced generating device is designed. Its main circuit topology is electric power converter of AC-DC-AC with cascaded H-bridge units. The novel method of injecting the negative sequence components is used to simulate voltage unbalance disturbances. The correctness and effectiveness of the device and control algorithms are verified through experiments. This is of great significance for the development of three-phase unbalance compensation device and power quality control equipment and thus to improve the power quality.

关键词： Voltage power quality Railway electrification Rail transportation Furnaces Welding power system analysis computing power system measurements Electrical safety Safety devices

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Modeling and simulation of a microturbine generation system based on PSCAD/EMTDC

Modeling and simulation of a microturbine generation system ...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Li, Gang Li, Gengyin Yue, Wei Zhou, Ming Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

Distributed generation (DG) technology has drawn increasing attention for its tremendous benefits to customers, utilities and the environment. Furthermore, microturbine based power generation has become the most promising DG for its excellent record of improving system stability and economy. In this paper we develop a complete mathematic model, which includes the microturbine, a permanent magnet synchronous generator (PMSG), a three-phase bridge AC to DC rectifier, a boost converter and a DC to AC inverter. The simulated microturbine generation system (MTGS) model is a single shaft type with control systems and capable of regulating its output power in grid-connected mode. Also, the design and modeling of a MTGS which is suitable for isolated operation are explained with the ability of electronic controls that maintains the output voltage at their prescribed levels. Different load conditions are applied to the MTGS for evaluation of the validity and practicability of the model. Simulation studies have been carried out in PSCAD/EMTDC under different load conditions. Simulation results testify that the MTGS developed from this model can produce predictable results with these control methods. © 2010 IEEE.

关键词： system stability

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Information entropy based contingency selection for available transfer capability calculation

Information entropy based contingency selection for availabl...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Zheng, Yanan Zhou, Ming Li, Gengyin Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424459407

Available Transfer Capability (ATC) is a measure of the transfer capability remaining in the physical transmission network for further commercial activity over and above already committed uses. Putting forward against the defect that the traditional contingency selection method uses single index to enumerate states or disturbances, this paper introduces the active power behavior index and the voltage-reactive power behavior index, and uses the entropy weight to rank and select the states which seriously affect the system;then from the point of both safety and economy, optimal power flow model is used in every power flow calculation;last introduces the maximum entropy principle to research the probability distribution of ATC. By simulating on the IEEE-14 bus test system, the proposed method has the advantages over the conventional approach in contingency selection, calculation accuracy and processing speed. ©2010 IEEE.

关键词： Probability distributions

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Energy storage control for the photovoltaic generation system in a micro-grid

Energy storage control for the photovoltaic generation syste...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Wang, Zhongqiu Li, Xi Li, Gengyin Zhou, Ming Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

Distributed generation (DG) that uses renewable energy sources has an unstable output and this can negatively affect existing electric power systems. In order to reduce above impact, we need to develop an energy control system to control the output through individual DG installed in a micro-grid. First, this paper designs a grid-connected Photovoltaic (PV) system and introduces 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. Then, it uses the battery as the energy storage device and designs the charge-discharge control strategy according to the characteristics of the battery. Finally it verifies the feasibility of the energy storage control strategy through the simulation models which is built based on the PSCAD/EMTDC platform. © 2010 IEEE.

关键词： Energy storage

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Dominant mode identification for low frequency oscillations of power systems based on prony algorithm

Dominant mode identification for low frequency oscillations ...

引用

International Conference on Critical Infrastructure

作者： Ding, Lan Xue, Ancheng Han, Fukun Li, Jin Wang, Maohai Bi, Tianshu Wang, Jinping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China North China Power Dispatching Center Beijing 100053 China North China Electric Power Research Institute Co.Ltd Beijing 100045 China

ISBN: (纸本)9781424480814

Once the power system low frequency oscillation occurs, the operators desire to find out the dominant mode LFO so as to take measures to suspend it. This paper proposes an identification method for dominant mode of LFO based on Prony algorithm in wide-area measurement system (WAMS). The presented method contains three steps, the first step is preprocessing of Prony analysis result, the second step is the dominant mode identification, and the third step is the grouping of different generators according individual generator's frequency and phase information. Among the dominant mode identification step, three indexes are proposed to select the dominant mode. The first one is the ratio of amplitude and damping ratio;the second one is mode energy and the third one is the amplitude of sinusoidal decay mode after a period of oscillation. The simulation results in a two-area-four-machine benchmark system and 10 generator 39-bus New England system by DSATools demonstrate that the proposed method has strong adaptability to noise, i.e., the method has good performance of identification. © 2010 IEEE.

关键词： Benchmarking

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A new node contribution factors for the low frequency oscillations of power system based on the PMU's data and HHT

A new node contribution factors for the low frequency oscill...

引用

International Conference on Critical Infrastructure

作者： Li, Jin Xue, Ancheng Wang, Jinping Ding, Lan Wang, Maohai Bi, Tianshu Han, Fukun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China North China Power Dispatching Center Beijing 100053 China North China Electric Power Research Institute Co.Ltd Beijing 100045 China

ISBN: (纸本)9781424480814

With the rapid development and interconnection of power systems, the low frequency oscillations(LFO) has become one of the serious factors threatening the power system stability. Thus, how to quickly locate the source of LFO and implement controller to suspend it, is an urgent task. The general approach to locate the sources of LFO is using the node contribution factor(NCF), which indicating the contribution of the node(generator) in the oscillation. This paper aims at proposed a new more effective method to calculate the NCF for LFO based on the HHT and data obtained with Wide Area Measurement system (WAMS). As general philosophy, the proposed NCF is defined as the ratio of the generators' node oscillation energy(NOE) and the total oscillation energy(TOE), related to a particular oscillation mode. The NOE and TOE is defined based on the intrinsic mode functions(IMFs), which is obtained with the application of the HHT method. In detail, the (individual) node oscillation energy is defined as the product of the node's oscillation amplitude and cosine of relative phase. And the TOE, is defined the positive (or reverse respectively) group total energy for the node in the positive or reverse respectively, where the positive (or reverse respectively) group total energy is the cumulative energy of all nodes in the positive(or reverse respectively) group. And the generator grouping is obtained according to the phase, which is defined for the IMFs obtained with the HHT method. Simulation results in 4-machine and 17- machine system show that the proposed algorithm for NCF is more effective than the existed algorithm. And furthermore, the active power signals have better performance than the angle signals. © 2010 IEEE.

关键词： Intrinsic mode functions

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