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A calculation method for a power user's CIC under specific conditions in smart distribution grid

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Science China(Technological Sciences) 2015年第7期58卷 1162-1172页

作者： SUN Bing yu yixin Key Laboratory of Smart Grid of Ministry of Education Tianjin University

This paper presents a practical method for calculating a power user’s customer interruption costs(CIC)under specific *** novel method has been developed,based on the CIC results predicted by Lawrence Berkeley National Laboratory(LBNL),so that the key factors,such as customer type,customer size,interruption occurrence time and interruption duration can be *** compared to the LBNL method,the method proposed here is easy to understand and easy to execute with an acceptable *** lays a solid foundation for further investigation of distributed generators and demand response in assessing reliability value of smart distribution grid(SDG).The effectiveness of the proposed method is confirmed through the assessment of RBTS-Bus2.

关键词： smart distribution grid reliability value customer interruption costs customer type customer size interruption oc-currence time interruption duration

1-Neighbour knapsack problem and prospective greedy algorithm of intentional islanding in active distribution network

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Science China(Technological Sciences) 2014年第3期57卷 568-577页

作者： yu yixin MA ShiQian Key Laboratory of Smart Grid of Ministry of Education Tianjin University

A connected and undirected graph model of active distribution networks with considering the function of interconnecting switches is constructed in this *** on this model,the island partition problem of active distribution networks can be described as a 1-neighbour knapsack *** effective heuristic algorithm named prospective greedy algorithm is then proposed to solve this *** studies on PG&E 69-bus network show the validity of the proposed model and algorithm.

关键词： active distribution network island partition 1-neighbour knapsack problem perspective greedy algorithm

Small signal stability region of power systems with DFIG in injection space

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 127-133页

作者： Chao QIN yixin yu Key Laboratory of Smart Grid Tianjin UniversityTianjin 300072China

The modal analysis method is utilized to study the influence of doubly-fed induction generator(DFIG)on electromechanical *** this basis,the small signal stability region(SSSR)of power systems with DFIG in injection space is evaluated and the corresponding relationship between SSSR boundary and electromechanical oscillations is *** effects of the locations of DFIG on SSSR are *** is found that the boundary of SSSR consists of several smooth surfaces,which can be approximated with hyper-planes in engineering *** the integration of DFIG,SSSR becomes smaller,thus indicating the deterioration of the small signal stability of the *** 11-bus system with four generators is used to illustrate the proposed method.

关键词： Doubly-fed induction generator(DFIG) Modal analysis Electromechanical oscillation Small signal stability region(SSSR)

A novel optimization method of transient stability emergency control based on practical dynamic security region (PDSR) of power systems

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Science China(Technological Sciences) 2004年第3期47卷 376-384页

作者： yu yixin LIU Hui ZENG yuan School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

This paper proposes a novel optimization method of transient stability emergency control based on a new concept of the so-called extended practical dynamic security region (EPDSR) defined in this paper and four experiential laws about the EPDSRs found from a number of studies in real power systems. In this method, the effect of a control action is represented by the displacement of EPDSRs critical hyper-plane boundary in the direction of its outer normal vector. If an unstable contingency occurs, appropriate emergency control actions are triggered so that the enlarged EPDSR can cover the current operating point. Based on these ideas, a mathematics model of emergency control strategy is developed for minimizing its total cost and guaranteeing power system transient stability. The simulation results on the 10-generator, 39-bus New-England Test System as well as other real power systems have shown the validity of this method.

关键词： emergency control, transient stability, EPDSR, critical hyper-plane boundary, experiential law

Dual-stage constructed random graph algorithm to generate random graphs featuring the same topological characteristics with power grids

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Journal of Modern Power Systems and Clean Energy 2017年第5期5卷 683-695页

作者： Shiqian MA yixin yu Lei ZHAO State Grid Tianjin Electric Power Research Institute Tianjin 300384China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China

It is a common practice to simulate some historical or test systems to validate the efficiency of new methods or concepts. However, there are only a small number of existing power system test cases, and validation and evaluation results, obtained using such a limited number of test cases, may not be deemed sufficient or convincing. In order to provide more available test cases, a new random graph generation algorithm, named ‘‘dualstage constructed random graph’’ algorithm, is proposed to effectively model the power grid topology. The algorithm generates a spanning tree to guarantee the connectivity of random graphs and is capable of controlling the number of lines precisely. No matter how much the average degree is,whether sparse or not, random graphs can be quickly formed to satisfy the requirements. An approach is developed to generate random graphs with prescribed numbers of connected components, in order to simulate the power grid topology under fault conditions. Our experimental study on several realistic power grid topologies proves that the proposed algorithm can quickly generate a large number of random graphs with the topology characteristics of real-world power grid.

关键词： Power gird topology Dual-stage constructed random graph(DSCRG)algorithm Random graph generation Connectivity Average degree Connected component

Challenges and R&D opportunities of smart distribution grids in China

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Science China(Technological Sciences) 2014年第8期57卷 1588-1593页

作者： yu yixin ZENG yuan LIU Hong SUN Bing Key Laboratory of Smart Grid of Ministry of Education Tianjin University

In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder loading,the load compositions and characteristics,the urban reliability and the integration of distributed generations of renewable *** on the survey results in the investigations,12 Facts are clearly *** shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates,the electricity efficiencies and the reliability of distribution systems,as well as to integrate increasing amount of variable distributed renewable *** based on the challenges,8 R&D opportunities have been identified.

关键词： asset utilization distributed generation power distribution reliability R&D opportunities smart grid surveys

Probabilistic steady-state and dynamic security assessment of power transmission system

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Science China(Technological Sciences) 2013年第5期56卷 1198-1207页

作者： LIU YanLi yu yixin Key Laboratory of Smart Grid of Ministry of Education Tianjin University

Two-level system model based probabilistic steady-state and dynamic security assessment model is introduced in this *** of nodal power injection caused by wind power and load demand,steady-state and dynamic security constraints and transitions between system configurations in terms of failure rate and repair rate are considered in the *** to insecurity is used as security *** probability distribution of time to insecurity can be obtained by solving a linear vector differential *** coefficients of the differential equation are expressed in terms of configuration transition rates and security transition *** model is implemented in complex system successfully for the first time by using the following effective measures:firstly,calculating configuration transition rates effectively based on component state transition rate matrix and system configuration array;secondly,calculating the probability of random nodal power injection belonging to security region effectively according to practical parts of critical boundaries of security region represented by hyper-planes;thirdly,locating non-zero elements of coefficient matrix and then implementing sparse storage of coefficient matrix effectively;finally,calculating security region off-line for on-line *** of probabilistic security assessment can be used to conduct operators to analyze system security effectively and take preventive *** results on New England 10-generators and 39-buses power system verify the reasonableness and effectiveness of the method.

关键词： power transmission system probabilistic security assessment time to insecurity security region uncertainties of windpower and load demand

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Basic Ideas of the Smart Grid

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Engineering 2015年第4期1卷 405-408页

作者： yixin yu Yanli Liu Chao Qin Key Laboratory of Smart Grid of Ministry of Education Tianjin University

Electrical power grids have encountered many challenges in recent years,including global warming,the quest for energy security,increasing cultural conservation,and the stringent power reliability and quality requireme... 详细信息

关键词：电网智能电力可靠性全球变暖能源安全文化保护数字时代

Security region based security-constrained unit commitment

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Science China(Technological Sciences) 2013年第12期56卷 2732-2744页

作者： yu yixin QIN Chao Key Laboratory of Smart Grid of Ministry of Education Tianjin University

As the issues of security and stability of power systems are becoming increasingly significant,it is necessary to consider the constraints of the static voltage stability and transient stability,which are closely related to the active power dispatch of power systems,in the daily power dispatch,*** unit ***,due to the complexity of these constraints and limitation of the existing analysis methods,there has been no unit commitment model reported so far that can deal with these security *** the other hand,as lack of effective measures to evaluate the security margin of dispatch schemes,it is difficult for power system operators to integrate both the security and economy of power systems in unit *** resolve the above-mentioned issues,a security region based security-constrained unit commitment model is presented in the paper,which gives consideration to both the security and economy of power *** the first time,the active power flow constraint,the static voltage stability constraint and the transient stability constraint are taken into account in unit commitment at the same *** model presented in the paper takes the operating cost,the branch transmission capacity margin,the static voltage stability margin and the transient stability margin as *** adjusting the weighting factors of sub-objectives,it is convenient to adjust the preference on the security and economy of power systems and reach a *** IEEE RTS-24 test system is adopted to validate the correctness and the efficiency of the proposed model.

关键词： unit commitment security region static voltage stability transient stability multi-objective optimization

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