Fujian Electrical Power Co.

Fuzhou, China

Fujian Electrical Power Co.

Fuzhou, China

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Zhou J.-P.,Fuzhou Electrical Power Industry Bureau | Zhou J.-P.,Fuzhou University | Lin H.,Fuzhou Electrical Power Industry Bureau | Lin H.,Fujian Electrical Power Co. | Wen B.-Y.,Fuzhou University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

Transmission network expansion planning is a complicated, multi-objective, nonlinear and combinatorial optimization issue. Aiming at the problem that genetic algorithm possesses the slow convergence speed and easily plunges in part convergence when solving the model of the transmission network expansion planning, this paper proposes a method of transmission network expansion planning based on improved quantum genetic algorithm. On the basis of the quantum genetic algorithm, the method proposes a strategy that the quantum chromosomes are directly compared with the current best solution to determine the rotating angle of the rotating gate. The strategy ensures every individual in population evolves with different convergence speed to complete both local and global search. Simultaneously, the whole interference crossover operation and negater mutation operation are put forward to prevent the algorithm plunging in part convergence. Three kinds of improvement strategies are targeted and can effectively improve the convergence function of quantum genetic algorithm in the planning for transmission network expansion. The transmission network expansion planning for Garver-6 system is performed by genetic algorithm, quantum genetic algorithm and the proposed method respectively. The result shows that the method has good global optimum capability, and the convergence speed is obviously improved.


Li T.,Fujian Electrical Power Co. | Xue Y.,China University of Petroleum - East China | Li J.,Xiamen Power Supply Bureau
IET Conference Publications | Year: 2013

The paper presents a new small current grounding fault location method applicable to distribution automation systems (DASs) using fault transient currents. The faulty section is identified by comparing the degree of similarity of transient currents of feeder terminal units (FTUs) (including faulty line selection device) at adjacent switches. If both transient currents are highly similar, then the section is regarded as the sound section, otherwise as the faulty section. The paper also analyzes the adaptability of the transient localization algorithm on DAS, as well as other key technologies such as time synchronization for FTUs, software and hardware processing ability, etc. The prototype system was installed in a typical distribution system in Xiamen Power Supply Bureau, State Grid Company of China. Dozens of grounding fault transients were captured with correct faulty line identification and faulty section localization. The method is reliable, free from the influence of arc suppression coil and easy to be implemented. It makes DASs function more complete, and helps to improve its overall performances.


Jiang X.-B.,Fuzhou University | Huang Y.-J.,Fuzhou University | Lai X.-S.,Fuzhou University | Lai X.-S.,Fujian Electrical Power Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2011

Return voltage measurement is an effective non-destructive testing method for diagnosis of transformer insulation state. Establishing transformer dielectric response equivalent circuit model is an effective way to analyze the relationship between insulation aging and characteristic quantity. Therefore, on the basis of establishing equivalent circuit mathematical model, equivalent circuit parameters identification was transformed into the mathematical optimization, then the improved ant colony algorithm was adopted to identify model parameters. Four test functions proved that using both global optimal solution and each iteration optimal solution in global pheromone updating could improve convergence speed, expand search scope, and using the dynamic local pheromone updating could also strengthen the ability of jumping out of local optimal value. The contrast of polarization spectra between model calculation and practical measurement shows that the solved equivalent model can accurately reflect the medium response characteristics of oil-paper transformer insulation.


Huang W.-H.,Fujian Electrical Power Co. | Xie Z.-H.,Fujian Electrical Power Co. | Chen X.-W.,Fujian Electrical Power Co. | Jiang X.-B.,Fuzhou University
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

A wireless temperature monitoring system based on Zigbee technology for high-voltage equipment was designed to detect the overheat-induced fault of switchgear assemblies. The system adopts the distributed hierarchical structure of decentralized measurement and centralized monitoring. The system takes the low-power microcontroller PIC16F690 as its control core and the digital temperature sensor DS18B20 as temperature acquisition device, and uses Zigbee wireless communication module for data communication to achieve a multi-cabinet, multi-channel temperature monitoring. The system has the advantages of low power consumption, good anti-jamming performance, high sensitivity, simple operation, etc., and it can realize real-time monitoring of temperature for high-voltage equipment, particularly for switchgears, in the enclosed high-voltage, strong magnetic field and large current circumstance. Application of the system demonstrates its merits.


Wang L.,Shandong University | Chen Q.,Shandong University | Li T.,Fujian Electrical Power Co. | Gao Z.,Shandong University | Li Z.,Shandong University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

When a fault takes place on a section in a power grid, the corresponding protective relays will trip the related circuit breakers to cut off the fault current. As a result, one or more outage areas would be formed. If the faulty section is restricted in the outage area, the efficiency of fault diagnosis program will be greatly promoted. On the other side, if the control center can not receive the whole alarm message of circuit beakers, all of the sections must be diagnosed because the outrage area can not be gotten. Furthermore, wrong diagnosis results may be gotten because of the missing of alarm messages. Given this back ground, based on graph theory, one or more outrage area can be partitioned by cut-set of nodes. Multi-objective optimization method skyline query was applied to sort the outrage area decreasingly based on the precision rate of fault section. The developed diagnosis method could make the diagnosis program much faster, and can insure the fault section will not be omitted. Petri net was applied as the diagnosis tool and several examples showed the accuracy of this method. © 2013 Chin. Soc. for Elec. Eng.


Lin F.,North China Electrical Power University | Zeng H.,Fujian Electrical Power Co.
Dianwang Jishu/Power System Technology | Year: 2011

Due to the existence of distributed capacitance and transition resistance in HV transmission lines, existing fault location methods based on one-terminal impedance are not suitable for the one-terminal fault location of HV transmission lines. To solve this problem, a transmission line model based on distributed parameters is built and the calculation formula for operation voltage at reference position is defined. A location function based on phase characteristics and a location function based on amplitude characteristics, which utilize one-terminal data, are given. It is known from theoretical analysis that the voltage loaction function possesses different phase characteristics while the selected reference position is located at the left side or the right side of the faulty point, i. e., an only step abrupt change of the phase characteristic occurs while the reference position moves through the fault point, and when the selected reference position coincides with faulty point, the amplitude of votlage location function reaches its minimum. On this basis a one-terminal phase-based fault location method and a one-terminal amplitude-based fault location method for the fault location of single-phase earth fault of HV transmission line are proposed. Simulation results show that the two proposed fault location method are slightly affected by fault position, transition resistance and load current, their fault location results are accurate for high-resistance earth-fault, thus they can meet the requirement of on-site application.


Li T.,North China Electrical Power University | Li T.,Fujian Electrical Power Co. | Zhao H.,North China Electrical Power University | Ou D.,North China Electrical Power University | Qi J.,North China Electrical Power University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The causes and characteristics of short interruption and its impact on customers are analyzed. The implication of short interruption is described and suggestions on the definition of short interruption in China are proposed. Through questionnaire and customers interview, an investigation is conducted on the distribution network short interruption situation and relevant customers' short interruption cost in a coastal city. An appraisal method for customers' short interruption cost is proposed. The relationship between the customer cost and the duration of short interruption is dealt with and the characteristics of customers' short interruption cost are indicated. © 2012 State Grid Electric Power Research Institute Press.


Ge S.-Y.,Tianjin University | He W.-T.,Tianjin University | Liu H.,Tianjin University | Lin H.,Fujian Electrical Power Co. | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

Evaluation index system and index calculation method of power supply model (PSM) is presented in view of the fact that the current research on the PSM of MV distribution system lacks effective analysis and evaluation method. Typical PSMs are evaluated by the evaluation index system. Firstly, PSM of MV distribution system is defined and typical types of PSM are presented. Secondly, evaluation index system of PSM which contains power supply capability, power supply quality, power transfer capability, economy and coordination is established and corresponding analysis method of each index is presented. The effect on power supply distance caused by load rate of lines is also considered so that calculation method of length of line is corrected in the analysis of reliability, voltage deviation, economy, etc. Finally, TRIANGLE power supply model is taken as an example to be evaluated by the evaluation index system and the evaluation result of each PSM is given.


Wang L.,Shandong University | Chen Q.,Shandong University | Li T.,Fujian Electrical Power Co. | Gao Z.,Shandong University | Li Z.,Shandong University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

Fault diagnosis is the premise of the self-healing of smart grid in the future. In order to promote the efficiency and accuracy of the fault diagnosis system, this paper puts forward a new kind of power grid fault diagnosis framework. It is supported by data grid and its main skeleton is the distributed system. Data grid provides reliable data to the fault diagnosis system in time while the distributed computation supplied by the distributed system can enhance the execution speed of the fault diagnosis program. The new diagnosis system including the data grid and distributed computation is obviously superior to the traditional C/S structure. Finally, the validity and feasibility of this method are testified by examples. © 2013 State Grid Electric Power Research Institute Press.


Xie Q.,Tongji University | Sun L.,Tongji University | Lin H.,Fujian Electrical Power Co. | Chen Q.,Fujian Yongfu Steel Tower Technical Development Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2012

In order to study wind-resistant load-carrying capacity and failure mechanism of high-voltage transmission tower under severe wind storms, one subassemblage of a typical 500 kV transmission tower which was designed following the current code and suffered severe damage during wind storms was fabricated and statically tested under equivalent wind load. The test results showed that failure of structure was caused by torsional-flexural buckling of the main member. The out-of-plane deformation of the cross-bracings exhibited continuously increase. In view of these characteristics, one corresponding subassemblage which was added with horizontal diaphragm at the joints of cross bracings was tested under the same loading procedure. It was found that, for the improved structural system, instability of main member remained the primary failure pattern. But the buckling mode was transited from torsional-flexural buckling to flexural buckling. Meanwhile, the out-of-plane deformation in the joints of cross-bracings was reduced significantly. By comparison, it can be obtained that the ultimate wind-resistant load-carrying capacity is increased by 22. 1%. Owing to the diaphragm, the unfavorable influence of torsion in the main member as well as the out-of-plane deformation of the cross bracings is inhibited. The mechanical performance of overall system is improved substantially. And it can be concluded that the structure with diaphragm behaves more brilliantly because its load carrying capacity and wind resistant performance are increased significantly.

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