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Zhang J.,Hangzhou Dianzi University | Zhang J.,Zhejiang Creaway Automation Engineering Co. | Jiang S.,Zhejiang Creaway Automation Engineering Co. | Jin N.,Shaoxing Electrical Power Bureau | And 3 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

Electric energy remote terminal unit (ERTU), an important plant-level device for periodic data acquisition of substation, is obviously a part of digital substation system. However, as the basis of digital substation, IEC 61850 has not covered all measurement of quantities of substation electric energy. Therefore, based on IEC 61850 standard extend principle, a new common data class (CDC) FEE, a series new data object (DO), and a new logic node (LN) MEEE, are introduced to build a complete ERTU object model and its instance. Such extension meets the principle according to corresponding articles in IEC 61850. In accordance with the practical application demand and analysis of digital energy meter as well as ERTU, a complete data service scheme using URCB controlled report and LOG mechanism based on a series DATA-SET definition, is designed for periodic data communication between energy meters, ERTU, master station. A novel ERTU based on above modeling was developed and implemented in a 110 kV substation in Zhejiang Province. © 2010 State Grid Electric Power Research Institute Press.


Hu Y.,Nanjing Tuowei Power Technology Development Co. | Zhang X.,Zhejiang Electrical Power Test and Research Institute | Xu W.,Shaoxing Electrical Power Bureau | Wang S.,Zhejiang Electrical Power Test and Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

The principle of IEEE 1588 clock synchronization system is discussed briefly. The possible error sources and factors influencing error are analyzed. The linear convergence comparision method is proposed for on-line clock synchronization system fault detection. The test results show that the fault or error in IEEE 1588 clock synchronization system can be found by proposed method. © 2010 State Grid Electric Power Research Institute Press.


Zhang J.,Hangzhou Dianzi University | Zhang J.,Zhejiang Creaway Automation Engineering Co. | Wu X.,Hangzhou Dianzi University | Chen Y.,Zhejiang Creaway Automation Engineering Co. | And 3 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

Mobile ICT based mobile business operation and its related technology are one of the core businesses and technologies of the smart gird. The field crews are equipped with mobile terminals and vehicles including filed working equipment under the unified command through the resources dispatching center, in which the mobile workforce optimal scheduling/dispatching model and its algorithm play the crucial role. The basic concepts and assumptions of mobile workforce dispatching are presented firstly. In particular, a return rule of "return chance check for 8 hours per day and must return after 5 consecutive field workdays" ("check 8 hours stop 5 days" for short) is suggested. An optimization sub-model is presented to take account of the time delay loss per expected start time, overtime delay loss per standard task time, "check 8 hours stop 5 days" return rule, total task finishing time constraint, crew idle loss, and the transportation time and its expenditure, etc., from which a comprehensive mobile workforce optimization model is developed subsequently. The genetic algorithm is adopted to solve such optimization. Case study results show that the models and algorithms can match the complicated situation of the electric utility. © 2013 State Grid Electric Power Research Institute Press.


Zhu L.,Xi'an Jiaotong University | Li H.,Shaoxing Electrical Power Bureau | Yao X.,Ohio State University | Ji S.,Xi'an Jiaotong University
Proceedings of the 2014 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2014 | Year: 2014

The feasibility of increasing operating capacity of existing power transformers is studied based on a novel dynamic thermal circuit model in this paper. Hot-spot temperature of a transformer is the most important parameter to determine the operation capacity. However, only top-oil temperature is monitored and hot spots usually appear at windings. In this paper, a dynamic thermal circuit model considering environment factors and operation conditions is established. To implement and verify the dynamic thermal circuit, the real-time loss and cooling thermal resistance of the transformer is calculated firstly. And then hot-spot temperature based on the average oil temperature is calculated for a period of 24 hours. The calculated result is compared with the measured temperature data under the same conditions. The comparison shows that the accuracy of the proposed model is satisfactory. The proposed model is then used to evaluate the feasibility of increasing operating capacity. The evaluation indicates that the continuous operating capacity can be increased. After capacity increased, the transmission energy can increase remarkably, while the service life is reduced lightly. © 2014 IEEE.


Zhu L.,Xi'an Jiaotong University | Ji S.,Xi'an Jiaotong University | Shen Q.,Shaoxing Electrical Power Bureau | Liu Y.,Xi'an Jiaotong University | And 2 more authors.
PLoS ONE | Year: 2013

The capacitors in high-voltage direct-current (HVDC) converter stations radiate a lot of audible noise which can reach higher than 100 dB. The existing noise level prediction methods are not satisfying enough. In this paper, a new noise level prediction method is proposed based on a frequency response function considering both electrical and mechanical characteristics of capacitors. The electro-mechanical frequency response function (EMFRF) is defined as the frequency domain quotient of the vibration response and the squared capacitor voltage, and it is obtained from impulse current experiment. Under given excitations, the vibration response of the capacitor tank is the product of EMFRF and the square of the given capacitor voltage in frequency domain, and the radiated audible noise is calculated by structure acoustic coupling formulas. The noise level under the same excitations is also measured in laboratory, and the results are compared with the prediction. The comparison proves that the noise prediction method is effective. © 2013 Zhu et al.


PubMed | Xi'an Jiaotong University and Shaoxing Electrical Power Bureau
Type: Journal Article | Journal: PloS one | Year: 2013

The capacitors in high-voltage direct-current (HVDC) converter stations radiate a lot of audible noise which can reach higher than 100 dB. The existing noise level prediction methods are not satisfying enough. In this paper, a new noise level prediction method is proposed based on a frequency response function considering both electrical and mechanical characteristics of capacitors. The electro-mechanical frequency response function (EMFRF) is defined as the frequency domain quotient of the vibration response and the squared capacitor voltage, and it is obtained from impulse current experiment. Under given excitations, the vibration response of the capacitor tank is the product of EMFRF and the square of the given capacitor voltage in frequency domain, and the radiated audible noise is calculated by structure acoustic coupling formulas. The noise level under the same excitations is also measured in laboratory, and the results are compared with the prediction. The comparison proves that the noise prediction method is effective.


Xu W.,Shaoxing Electrical Power Bureau | Zhang L.,Shaoxing Electrical Power Bureau
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

An on-line fault diagnosis system is designed for the network communication of substation automation system based on IEC61850 standard, the fault description models of which are designed independently and loaded dynamically, so that it is not necessary to modify the fault analysis program when new fault model is added to. The network communication recorder is used to record the information of MMS(Manufacturing Message Specification), GOOSE(Generic Object Oriented Substation Event), SV(Sampling Value), etc. According to the message type, the fault models are divided into 4 categories: MMS failure, GOOSE failure, SV failure and network failure. Practices show that the system detects the network communication fault in time.


Jin B.-R.,Shaoxing Electrical Power Bureau | Li D.,Shaoxing Electrical Power Bureau | Cai Z.-K.,Shaoxing Electrical Power Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

To control the switching overvoltage caused by switching off shunt reactor in 35 kV system, simulation and evaluation with the software ATP-EMTP, 10 kV laboratory test, and on-site test in 35 kV system were conducted to investigate the control of switching overvoltage. The treatments, such as circuit breaker switching at the side of neutral point of shunt reactor, and paralleling MOAs via shunt reactor, were verified through field experiments. The results indicate that the circuit breaker switching at the side of neutral point of shunt reactor can control the switching overvoltage effectively. In addition, the validity and applicable range of other treatments are discussed.


Liang H.-H.,Fujian Electrical Vocational and Technical College | Zhang F.,Northeast Dianli University | Chang C.,Shaoxing Electrical Power Bureau | Zhao T.,Northeast Dianli University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

According to the deficiencies of substation monitoring system at present, this paper designs a kind of substation monitoring and alarming system based on ZigBee wireless technology. The system utilizes CC2430 produced by TI company as the ZigBee module, and designs the ZigBee coordinator and ZigBee monitoring terminal nodes. The system uses GPRS for remote transmission, realizes wireless substation monitoring system. The system saves cost and reduces the complexity of construction substantially, and thus has broad application prospects.


Wang Y.,Zhejiang University | Wang H.-F.,Zhejiang University | Zhang L.,Shaoxing Electrical Power Bureau | Hu X.-P.,Shaoxing Electrical Power Bureau | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper proposes a maintenance type selection model based on effectiveness and cost analysis using CBM information. First, it defines effectiveness composed of three factors, namely, state health indictor, reliability and availability, gives each factor's formula, and analyzes the impacts of different maintanence types on each factor. Then, it gives maintenance cost's components with their formulas and effectiveness's calculating model. At last, it educes a maintenance type selection model aiming at most effectiveness per unit cost. Case study lists maintenance type selection process of a transfomer in certain state. The result shows that this model is reasonable and credible. This model is suitable for power equipment maintenance management, and can help maintenance staff make economic and effective maintenance arrangement.

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