Shenyang Power Supply Company

Shenyang, China

Shenyang Power Supply Company

Shenyang, China

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Zheng T.,North China Electrical Power University | Pan Y.-M.,North China Electrical Power University | Guo K.-Y.,Shenyang Power Supply Company | Wang Z.-P.,North China Electrical Power University | Sun J.,North China Electrical Power University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

A new method of fault section location and isolation in distribution networks based on immune algorithm (IA) is presented. Immune algorithm gets individual evaluation from its affinity. Selection of the crossover and mutation individuals is not only based on its affinity but also concentration, which increases colony diversity, avoids partial optimization, and speeds up the rate of evolution. Besides, this method can establish memory units and retain part of the optimal solutions in order to avoid degeneration in the process of crossover and mutation and guarantee the result is the individual of the highest level of affinity when the algorithm is terminated. A method based on the idea of area division and fault alarm of the incoming break is proposed to improve the speed of location for open-loop operational distribution networks. Finally the simulation results show that the immune algorithm can realize the goal of fault location and the comparison results with genetic algorithm testify its validity and reliability.


Chen K.,Tsinghua University | Wu W.,Tsinghua University | Guo K.,Shenyang Power Supply Company | Zhang B.,Tsinghua University | Wang Y.,Shenyang Power Supply Company
Dianwang Jishu/Power System Technology | Year: 2013

In view of the radial structure of common distribution networks, any fault occurred in distribution network may lead to instantaneous or permanent power losing of partial load. The post-fault power-lost load can be restored automatically or manually, thus the post-fault situation of power-lost load, in which the control factors in the restoration are considered, can characterize the security of current operation of distribution network better. Firstly, a restoration model, in which the more power-lost load can be restored is taken as the objective, is given, and this optimized model with mixed integer quadratic constraint can be solved by CPLEX efficiently. On this basis, combining with fault simulation under N-1, an index for security evaluation of distribution network is established. Results of numerical tests are given to illustrate the rationality of the proposed evaluation method.


Sun J.,North China Electrical Power University | Wang Z.-P.,North China Electrical Power University | Wang Y.-N.,Shenyang Power Supply Company | Pan Y.-M.,North China Electrical Power University | Zheng T.,North China Electrical Power University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

Taking into account the complex and the lack of load data of actual distribution system, this paper establishes a simplified model of distribution network based on the equivalent load which can reduce the calculation time and reflect the flow distribution of the distribution network. A service restoration program for complex distribution system with distributed generation is proposed. When serious failures result in large area power blackout, the best supply area of the island is determined when the distributed power supply capacity is known and DG switches to the islanding operation mode to maintain the power supply for the important load. Then the remaining network loss of power is restored based on heuristic rules and optimized with the improved branch-exchange algorithm to make the loss of power load and network loss as little as possible. At last, the simulation results of the example show that the method can effectively solve the problem of distribution network service restoration.


Zhou B.,Shenyang Institute of Engineering | Yu M.,Shenyang Power Supply Company | Liu T.,Yuhong Power Supply Bureau of Shenyang Power Supply Company
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2016

Cyber Physical Systems (CPS) combines physical and computing systems tightly. Node operating systems (OS) are fundamental units in CPS. There are still many problems unsolved when designing CPS especially CPS node OS in aspects of predictability, reliability, robustness, etc. In this paper we propose a mixed priority real time scheduling method to enhance the CPS node OS performance. Generally, CPS node operating system uses a single method to assign priority. The single priority selection method will lead to the high deadline miss ration, which make the node OS performance drop sharply. Aiming at this problem, a scheduling method is proposed whose priority selection is determined by several characteristic parameters. The results show that the DMR of the proposed method is lower than that of single parameter method. Consequently, the predictability and reliability of CPS node OS is improved effectively. © 2016 IEEE.


Jia H.,North China Electrical Power University | Zheng T.,North China Electrical Power University | Zhao P.,Taizhou Electrical Power Company | Guo K.,Shenyang Power Supply Company | Zhang J.,North China Electrical Power University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

A fault region searching based fault location algorithm for the distribution system is proposed, which asks for installation of current measuring elements in only a limited number of nodes. Firstly, the fault-selected section is determined through the coordination between Agents. Then the impedance-based algorithm is performed for the fault-selected section in the corresponding Agent. If the fault-selected section is upstream of distributed generation (DG), the algorithm is executed in the master station Agent using local measurements and DG-related measurements. If the fault-selected section is downstream of DG, the algorithm is executed in the line execution Agent using the local measurements only. The method proposed is applicable to the distribution system with plenty of branches and is remarkable in calculating speed. At the same time, the method does not need plenty of remote data transmission. A simulation model based on MATLAB is developed to verify the algorithm and the results show that the algorithm proposed is accurate enough even in the condition of high fault resistance. © 2012 State Grid Electric Power Research Institute Press.


Wang X.,CAS Shenyang Institute of Automation | Wang X.,University of Chinese Academy of Sciences | Yang Z.,CAS Shenyang Institute of Automation | Wang Y.,Shenyang Power Supply Company | Wang Z.,CAS Shenyang Institute of Automation
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2013

This paper proposes a dual extended Kalman filtering (DEKF) algorithm for estimating the State-of-Charge (SOC) of lithium-ion batteries on line. First of all, the state-space representation of the battery model is established based on Thevenin battery model and Kalman filtering algorithm. The least squares method and the DEKF algorithm are used to identify the battery model parameters, which improves the model accuracy and facilitates the battery model to well reflect the actual internal state of the battery. Moreover, the principle of using DEKF algorithm to estimate the inner SOC of the battery on line is introduced, and corresponding battery test experiments are designed. Experiment results demonstrate that under various operating conditions, the algorithm has relatively high accuracy and good environment adaptability when applied to evaluate SOC on line; and the maximum error is less than 4.5%. The DEKF algorithm is proved to have good convergence and robustness, and can efficiently solve the problems of inaccurate initial-value estimation and error accumulation.


Jin P.,Shenyang Power Supply Company | Meng T.,Northeastern University China | Guo K.,Shenyang Power Supply Company | Shao F.,Shenyang Power Supply Company
Proceedings - 2015 Chinese Automation Congress, CAC 2015 | Year: 2015

In the face of problems of communication network in the smart city, which is featured with the limited bandwidth and huge amount of data, it is difficult to ensure the validity of the data transmission. Based on the rate of timeliness and data transfer rate, this paper improves the LEACH algorithm, and shows that it can ensure the timeliness of various types of data transmission and improve the efficiency of data transmission by the simulation. In addition, this paper proposes an overall design of one map-Two line-four meter-four network, which has been applied to the construction of Shenyang city. The demonstration project can meet the requirements of the smart city effectively and support the construction of the smart city strongly. © 2015 IEEE.


Zheng T.,North China Electrical Power University | Pan Y.,North China Electrical Power University | Guo K.,Shenyang Power Supply Company | Wang Z.,North China Electrical Power University | Sun J.,North China Electrical Power University
Dianwang Jishu/Power System Technology | Year: 2013

A nodal impedance matrix based improved fault location algorithm for distribution network is proposed. The topological structure and parameters of distribution network will change after the fault and it leads to the change in nodal impedance matrix, in other word, the post-fault nodal impedance matrix in which the unknown fault distance and transition resistance are involved, is formed, thus based on physical meaning of nodal impedance the expression of fault location can be established. For the proposed algorithm, only current and voltage of substation outgoing line are needed as the input variables, and the voltage and current of the bus located at the upstream of the faulty zone can be calculated by iteration, and substituting the calculation results into the established fault location expression the fault distance and transition resistance can be solved. To suit the features that the load characteristics in distribution network are time-varying and not unified, it is put forward that the load in distribution network is simulated by the static voltage characteristic based load model, and adopting such a model the post-fault loads and the shunts in branches can be calculated more accurately to make the result of fault location more accurate; it is also put forward that combining with the feeder automation function of distribution network the number of pseudo fault points can be reduced and it is helpful to fault location. A model of IEEE 34-bus distribution system is constructed by PSCAD, and the proposed fault location algorithm is implemented in Matlab-based environment. Simulation results show that the proposed fault location algorithm is effective.


He X.H.,Beijing Jiaotong University | Wang W.,Beijing Jiaotong University | Wang Y.N.,Shenyang Power Supply Corporation | Kong J.,Liaoyuan Power Supply Company | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

According to the problem of optimal power flow (OPF), the optimization objectives including minimization of total fuel cost for generating units, minimization of emission for atmospheric pollutants, minimization of active power losses and minimization of voltages deviations are established. The paper uses fuzzy membership functions instead of multi-objective functions to form fuzzy optimal power flow in the optimal power flow calculation process. The novel artificial bee colony (ABC) algorithm is proposed to solve OPF problem with multi-objective. The proposed approach is applied to the OPF problem on IEEE30 test systems. And the simulation results verify the effectiveness of the proposed method. © (2014) Trans Tech Publications, Switzerland.


Jin P.,Shenyang Power Supply Company | Liu S.,Northeastern University China | Guo K.,Shenyang Power Supply Company
Proceedings of the 28th Chinese Control and Decision Conference, CCDC 2016 | Year: 2016

Differentiation planning reasonably has instruction function for strengthening the construction of the distribution network structure with pertinence, as well as improving the ability of withstanding natural disasters. A method of differentiation planning of distribution network structure was proposed, based on its weaknesses. Aimed at the situations of natural disasters and important consumers, network reconfiguration with the objective to minimize the load shedding was used to search for the post-disaster structure. After that, the assessment of economy and resilience index were applied with planning, the optimal planning was determined with the operation method of technique for order preference by similarity to an ideal solution (TOPSIS). By the analysis of example, the resilience assessment of structure weakness plays a conductive role of differentiation planning on distribution network. © 2016 IEEE.

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