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检索条件"机构=Key Lab of Power System Intelligent Dispatch and Control"

共 1779 条记录，以下是1641-1650 订阅

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A New Definition of Multi-Infeed Short Circuit Ratio Considering control Modes of DC system

A New Definition of Multi-Infeed Short Circuit Ratio Conside...

引用

2015 International power,Electronics and Materials Engineering Conference(IPEMEC 2015)

作者： Kang Zhao Dong Yang Yutian Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) State Grid Shandong Electric Power Research Institute

ISBN: (纸本)9781510806474

The mathematical relationship between reactive power consumed by DC system and AC voltage on inverter bus is derived under different control modes,*** on these relationships,a new definition of multi-infeed short circuit ratio(MISCR) is formulated from the power-flow model of PQ decoupled *** specific influence of different control modes on voltage stability is *** the relationship between MISCR and voltage stability of AC/DC hybrid system,the characteristics of values of new MISCR are *** study of an actual regional power grid validates these characteristics.

关键词： AC/DC hybrid power system Multi-infeed interaction factor Multi-infeed short circuit ratio control mode of DC system

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A region-based method for high-risk wind power ramp events detection

A region-based method for high-risk wind power ramp events d...

引用

International Conference on Renewable power Generation (RPG 2015)

作者： Hao Wang Hongtao Wang Hao Gong Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan 250061 Shandong Province China

ISBN: (纸本)9781510821415

Over the past decade, wind energy has become one of the most prevalent renewable resources. The installed wind capacity continues to increase and the penetration of wind power has reached a relatively high level in some area. In this context, extreme volatility of wind power, i.e., ramp event can bring serious challenges to maintaining balance between the generation and the demand. Most ramp forecasting methods use event detection models based on series analysis of wind power forecast data or regression models based on data mining of historical data. However, real-time risk assessment on power system during the ramp process is almost neglected in these methods, which means that the forecast results are incomplete and operators can't get sufficient risk information of ramps. This paper proposes a region-based method for high-risk wind power ramp events detection. In this method, an algorithm is developed to find the border of secure region of wind power integrated to power system considering several security constraints, the result of which is then used for recognition of high-risk ramps during the forecast process. Case study shows the effectiveness and practical application value of this method.

关键词： accommodation region risky ramps detection unit commitment wind power

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Parameters-setting Method for Synchronization of Pumped Storage Units under Pumping Condition 5

Parameters-setting Method for Synchronization of Pumped Stor...

引用

5th International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Zhang, Zhiming Cong, Wei Wang, Fei Hao, Guowen Li, Jianguang Yang, Yanping Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China State Grid Xinyuan Co Ltd Beijing Peoples R China Power Stn Co Ltd Shandong Taishan Pumped Storage Tai An Shandong Peoples R China

ISBN: (纸本)9781467371063

This paper presents a parameters-setting method for the synchronization of pumped-storage units under the pumping condition. The synchronizing process of the units is analyzed and the synchronizing parameters-setting principle of generating units is referred. Finally, the method is educed through mathematical formula derivation. Under the pumping condition, the setting value of the closing pulse leading time and the synchronizing process are both different from those of the generating condition, so the changes of voltage and frequency of pumping condition during closing pulse leading time are deduced. Then, the setting method of the allowable voltage difference, frequency difference and closing angular phase difference could be obtained. The parameters-setting method in this paper provides the theoretical foundation for synchronizing parameters setting of pumped storage unit. It is significant for decreasing the synchronizing impact current and heightening success rate of synchronization.

关键词： pumped storage plumping condition quasi-synchronization synchronizing parameters

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Cooperative sequential reconfiguration for distribution networks

Cooperative sequential reconfiguration for distribution netw...

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Zhenyu Du Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch Control of Ministry of Education(Shandong University) Jinan P.R. China

With huge penetration of distributed generators (DGs), distribution systems become more and more active and flexible. To accommodate DGs in a much more optimal way, cooperation between transmission networks and distribution networks, even distribution networks and distribution networks, should be further strengthened. A cooperative sequential reconfiguration method is proposed in this paper, which is designed to achieve the optimization of multiple distribution networks in a coordinated way rather than in an isolated way. The global power flow is calculated to reflect interactions among various networks. A sequencing index is introduced for guiding distribution networks to be reconfigured sequentially, which is based on the absolute value of voltage variation at boundary nodes. Reconfiguration for each distribution network is implemented by using the improved optimal flow pattern algorithm. The effectiveness of the proposed method is verified by the simulation results with total active power loss reduction and voltage quality improvement.

关键词： Indexes Load flow Sequential analysis Reactive power Generators Switches Optimization

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Longitudinal Moment Markov Chain Model of Wind power and Its Application on Ultra-short-term Prediction 5

Longitudinal Moment Markov Chain Model of Wind Power and Its...

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5th International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Sun, Jingwen Yun, Zhihao Liang, Jun Yang, Xiaojuan Yang, Libin Wang, Xueli Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China Shandong Normal Univ Sch Commun Jinan Peoples R China State Grid Qing Hai Elect Power Res Inst Qinghai Peoples R China State Grid Shandong Elect Power Maintenance Co Jinan Peoples R China

ISBN: (纸本)9781467371063

In this paper, a longitudinal moment Markov chain model of wind power time series based on the longitudinal time concept is proposed. This model emphasizes the transition characteristics related to different moments by providing a set of transition probabilities matrices. This matrices set, describing the inherent transition information of moments, gives the necessary probabilistic conditions for optimization decision of power systems containing wind farm. Besides of rapid calculation as conventional Markov chain model has, the proposed model makes the transition information more detailed and accurate. To illustrate the effect of improvement, a wind power prediction (WPP) method on ultra-short-term horizon using the longitudinal moment Markov chain model is put forward. The case study based on actual wind power data under multiple time scales shows that the proposed method achieves a higher prediction precision.

关键词： wind power longitudinal moment Markov chain model wind power prediction

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Optimal scheduling of active distribution networks with energy storage systems considering environmental cost

Optimal scheduling of active distribution networks with ener...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Rongrong Bao Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan P. R. China

Along with the increasingly serious environmental issues, besides economic efficiency, much attention is paid to the environmental aspects in the daily dispatch of active distribution networks (ADN). This paper presents a comprehensive optimal model to minimize the economic cost and environmental cost. The damage cost from gas emissions and the uncertainty of renewable generations are taken into consideration. The charging and discharging strategy of energy storage systems (ESS) is a focus of the model. The general algebraic modeling system (GAMS) is used to solve this mixed-integer nonlinear problem. A modified 33-bus distribution network including photovoltaic (PV) systems and ESSs is employed to illustrate the effectiveness of the proposed method. Simulation results under different scenarios, with and without PVs/ESSs, show that utilization of charging/discharging strategy of ESSs can decrease the economic cost through peak load shifting. Moreover, increasing the penetration of renewable generations leads to the decrease of total cost.

关键词： Economics Partial discharges Energy storage Linear programming Cost function Decision support systems power industry

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Consistency Analysis of DFIG Wind Generation Models in PSS/E and PSASP 5

Consistency Analysis of DFIG Wind Generation Models in PSS/E...

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5th International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Fu, Tao Zhang, Hengxu Li, Changgang Xu, Qingwen Liu, Xiaoming Zhang, Ji Qi, Chao Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Sch Elect Engn Jinan Peoples R China Shandong Univ Technol Sch Elect & Elect Engn Zibo Peoples R China State Grid Shandong Elect Power Co Econ &Teclmol Res Inst Jinan Peoples R China

ISBN: (纸本)9781467371063

With rapid increase of wind power installed capacity, the operation mode of power system has changed greatly, it is necessary to include modeling and simulation based on wind turbines and farms. Numerical simulation plays a unique role in power system operation and control, and its accuracy turns out to be the focus of electric industry. PSASP and PSS/E, as two main sorts of simulation analysis software at home and abroad respectively, both enable wind turbines electromechanical transient simulation. In this paper, Detailed comparisons are made between Doubly -fed induction generator (DFIG) in PSS/E and PSASP. Finally, simulative results of power system including the models are compared and analyzed.

关键词： power system Numerical sinudation PSS/E PS-ASP doubly-fed induction generator models

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An improved method of transformer parameter identification based on measurement data

An improved method of transformer parameter identification b...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Yaping Zhang Hengxu Zhang Qianying Mou Changgang Li Liang Wang Bing Zhang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China

The accuracy of transformer parameters is critical for power system analysis and control decision. In practice, the parameters of a transformer may deviate from its factory values due to the influence of environment and equipment aging. An improved model is presented in this paper to identify transformer parameters based on WAMS and SCADA data. Relative errors are considered in the objective function. Cases with different objective functions are examined. The accuracy and convergence of the different method are compared.

关键词： Linear programming Object recognition Estimation power industry power systems control systems Production facilities

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An improved algorithm for power system reliability sensitivity analysis

An improved algorithm for power system reliability sensitivi...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Zhihong Guo Hui Wang Yong Wang Guojing Liu Yeyong Li State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China

The power system reliability sensitivity analysis can recognize weak parts of the system. It is significant for system reliability assessment and enhancement. Against deficiencies in conventional reliability sensitivity analysis, this paper proposes an improved method by analyzing graphical representations of sensitivity and practical engineering requirements. This method meets real needs better and keeps the calculating errors of reliability indices from impacting results of component sensitivity assessment effectively. What's more, cooperating with the generalized power network reliability analysis, the suggested method can estimate and compare the sensitivity of commonly-used primary equipments in power system directly, satisfying the needs for maintenance strategy better.

关键词： IP networks Reliability power system reliability power industry Decision support systems Sensitivity analysis

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A Hybrid Compensation Method for Electric Railway's power Quality Improvement

A Hybrid Compensation Method for Electric Railway's Power Qu...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Yuanyuan Sun Chuankai Dai Jiaqi Li Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China State Grid Qingdao Electric Power Company Qingdao China

ISBN: (纸本)9781467371070

Electric railway brings many power quality problems to the public power system. In this paper, a new power quality improvement method is proposed which can alleviate the voltage unbalance and low power factor problem of electric systems. The method is composed of a specially connected three phase to two phase transformer and a phase balancing device. The specially connected transformer has the following common characteristic: secondary voltages are equal in magnitude and differ 90 degrees in phase angle. Such transformers include Scott Transformer, Le-Blanc Transformer, and modified Wood-bridge Transformer and so on. The phase balancing device consists of two parts: one is used to regulate the power factor to unity;the other part is to transfer power flow between the two feeders, thus balancing their loads. With the proposed scheme, negative current can be eliminated and power factor can be regulated to unity. The advantage of the new method is that it is very simple and cost-effective. Validity of the proposed method is verified by simulation results. The capacity of the compensation device is also analyzed in the paper.

关键词： Electric railways Unbalance power factor power quality

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