Abstract:In order to improve power supply reliability and enhance intelligent operation level of power distribution network, this paper proposes a planning proposal for the automation system of the Jiangsu distribution network in the period of 2015 to 2020. It firstly introduces the current status of the Jiangsu distribution network. Secondly, it defines the planning basis, and proposes the planning scheme in details, such as main station configuration, terminator configuration and communication planning. Then, distribution automation construction scale together with investment estimate are determined. Finally, the performance of the planning is analyzed. The results indicate that the proposed planning produces great economic and social returns.

Abstract:At present, the model, computing and storage resources cannot be configured to optimize the status quo in a larger area due to independent construction of sub-area's dispatching automation systems. Taking the advantages of cloud technology, such as elastic stretch, global resource management and high reliability features, a two-level regional dispatching control support system is designed. The first level, public cloud service center, contains the province's model cloud and data cloud, and services to the global non-real-time analysis business. The second level are private clouds of sub-areas, which services to distributed real-time regulation business. The system architecture, functionality and implementation are elaborated, and the promotion of the performance and function of the system is analyzed.

Abstract:To improve the accuracy of thermal calculation for tri-sectional rotary air heaters, a differential element model has been set up based on the heat transfer principle of rotary air heaters and the characteristics of temperature distribution, considering the influence of air leakage. And then the analytical expressions of each sector have been obtained. At last, the fluid temperature and the mean temperature on vertical section of metallic heat accumulation plate can be calculated by means of iteration based on the analytical expressions of each sector. When 1000 MW tri-sectional regenerator is selected as computational object, the results indicate that the new method has high precision, and the calculation area can be divided as require to meet different demands of project. Also, this method can obtain the mean temperature field of the vertical section of metallic heat accumulation plate, which could provide temperature reference for analyzing low-temperature corrosion and ash deposition.

Abstract:The total electric field of DC lines at ground level and sensitive nearby ground in Jiangsu province has been measured. According to the measurement results, several conclusions have been obtained: the total electric field at ground level is weakest at the middle position of DC line; the total electric field at sensitive nearby ground has a trend that it increases first and then reduces with the increase of the distance; the height of DC line has an obvious influence on total electric field of DC lines at ground level; and a larger distance of the indicates a weak total electric field of DC lines at sensitive nearby ground.

Abstract:A Pitot anti-blocking device is developed, based on detailed analysis on blocking causes of Pitot velocity measuring device installed on the outlet of the limestone-gypsum flue gas desulfurization system in coal-fired power plants. The device is blown with power plant instrument compressed air, and uses Siemens S7-200 PLC to achieve timing control. Results show that the device can effectively reduce the blocking issues encountered in Pitot velocity measuring device.

Abstract:The research and innovation of the commercial mode of electric vehicle is an effective way of solving electric vehicle industrial problems. As the charging and battery-swapping business of electric vehicle is being treated as the extension of the value chain of power grid enterprises, participation of power grid enterprises will promote the development of electric vehicle industry greatly. In this paper, the co-operating mode of battery-swapping business of power grid enterprises is analyzed based on the theory of Wei-Zhu six elements commercial mode. The analysis includes six aspects, namely market position, business system, key resources and capabilities, profit pattern, structure of cash flow and enterprise value. Then the business system and profit pattern are researched in detail. Finally, this paper discusses the transaction processes of battery-swapping business that power grid enterprises provide to electric vehicle private users.

Abstract:Deploying auxiliary damping controlling unit in douly-fed induction generator (DFIG) is an effective way to suppress the low frequency oscillations in the multi-machine system with large-scale wind farms. However, auxiliary damping controlling unit in DFIG may reduce the positive damping provided by PSS. In this paper, a parameter coordination and optimization method for auxiliary damping controlling unit and PSS is proposed. Both electromechanical and non-electromechanical modes are considered in the objective function, and a calculation method based on the PSO is proposed. The three-machine system is taken for performance analysis, and the parameter of auxiliary damping controlling unit and PSS is designed. Time-domain simulation results show that the method can improve the performance of damping low frequency oscillation.

Abstract:The economic benefits of wind farm is deeply affected by the failure rate of wind turbine. In order to quantify the economic losses caused by fault wind turbine, this paper proposes a method for evaluating power generation loss. This method is based on the fault wind turbine's real output power curve and estimated wind speed. The estimation of wind speed of fault turbine is based on the real wind speed of the nearest normal wind turbine. The realization of this method in wind turbine monitor system is presented, and the performance of the estimation method is verified.

Abstract:As the most important style of reactive power compensation systems, it is important to study the control system of static synchronous compensator (STATCOM) to keep its stable and normal operation. This paper analyzes the influences of bias magnetic to STATCOM, and proposes an effective magnetic bias control method for second harmonics reduction. It improves the quality and reliability of STATCOM output voltage. Finally, the method is applied to the ± 500kVar STATCOM, and the results show the compensation method is effective.

Abstract:This paper introduces an automatic test scheme for high-voltage bus protection which has already been in-service. Testing bus protection has some difficulties, such as the large number of IO interfaces, permutation and combination of bus operation modes, long time of testing execution, and easy to miss. This paper introduces practical example of automatic bus protection testing scheme. The testing scheme is based on test platform named 'Testcenter', and use Python as developing code language. Its produce scenarios automatically according to the predefined aims and then intelligently implement testing process. This scheme is applicable fo nb r both traditional and digital protections, and supports to the IEC 61850 and IEC 103. Currently, this proposed scheme can intelligently implement automatic static test the protections with various connections of PCS-915 series.

Abstract:This paper presents a method to improve the EPON hand-in-hand protection in event failure. The simulation mode of power distribution communication network in EPON is established, which is applied in analyzing the network characteristics of OLT, ONU and Switch under hand-in-hand protection. Based on Ethernet principles, two assistive functions, port-isolated and gratuitous ARP, are proposed for the optimization of hand-in-hand protection. The switching delay less than 50 microseconds is achieved. Effectiveness of the proposed method is verified by a real system.

Abstract:Electricity consumption in the Jiangsu power grid in 2013 exceeded the amount of the Guangdong power grid and ranked the first over the whole country. With the increasing growth of power load and the complexity of the power grid, it is more important and difficult to choose the supply restoration path rapidly and realize elaborate supply restoration. Targeting at practical power system operation, an online-decision method of power supply restoration considering equipment risk is proposed in this paper, so as to provide technical support to the dispatch operation in the Jiangsu power grid. The effectiveness and correctness of the method are verified by the analysis on a real fault case that happened in the Jiangsu power grid.

Abstract:In this paper, the forecast method for the electricity demand in future 40 years in Jiangsu Province is proposed. According to the Co-integration Theory, the key economic factors are selected for the construction of the econometric model to describe the balanced relationship between the economic development and electricity demands. Finally this model is utilized to forecast and verify the proposed method.

Abstract:In order to improve regional power grid's voltage regulation ability, a method of introducing high voltage level automatic voltage control system to the grid is proposed. The EHV substation is taken as the key position substation in each regional power gird and the voltage control aim in the EHV substation is established based on load prediction. Using this method the voltage quality in this regional power grid can be fast optimized and voltage regulation times can be reduced. The results of the Zhongshan power grid show that the proposed method can rapidly improve voltage qualification rate, reduce action times of equipment effectively, and improve the economical performance of regional power grid.

Abstract:Distribution generation (DG) and Micro-grids (MG) are two important aspects of intelligent distribution network (IDN). MG provides solution of integration of large-scale distribution sources into power grids. Meanwhile, MG shares the same goal of energy optimization with IDN. Also, it has the advantage of low loss. In this paper, first, MG and its application in distribution network is introduced. Then, the superiority of DC MG and its basic structure are presented. At last, coordinated control technologies of multi-converters in DC MG are analyzed. The discussion in this paper might be useful for the research on DC transmission technologies in MG.

Abstract:In this paper, the layout method of PV array in the PV power station constructed on slope land is studied. Based on the concrete gradient and orientation of the site, an optimized design of PV array spacing is proposed. Using mathematical tools the calculation formula of fixed tilted PV array spacing on different orientation slope is established. The simulations of an actual case in a 3D software validate the proposed calculation formula.

Abstract:Taking the 10 kV line layer and 0.4 kV interval in distribution network as research objects and using the equivalent resistance method and regression analysis method, this paper proposes a model for distribution network line losses calculation. With the proposed calculation model, different measures for loss reduction in distribution network are calculated and analyzed. Based on the analysis, the best measure in terms of loss reduction potential and economic benefit can be selected. The proposed model can support electric power enterprises' project decision.

Abstract:The existing management systems of operation sheets can realize the function of real-time online graphic generating under the strict verification rules such as Expert System (ES). However, humane intervention in permission/conclusion, sheet rehearsal, order repetition and supervisory system is still needed during the executing process. To solve this problem, a new safe execution system which integrated google glass into operation sheets is proposed. In this system the voice/character/gesture recognition and video communication modules are developed based on google glass. These modules replace humane works so that the computer can be taken as a remote supervisor for single-person operation instead of the original two-person field task. The proposed system reduces labor cost considerably and improves the working efficiency greatly, which finally promotes the reliability of operation sheets execution.

Abstract:As an important part of the smart grid, distribution automation system is the development trend of modern power grid. This paper studies similarities and differences between the communication modes in the first and second phases of Nanjing distribution automation system. The comparison indicates that channel optimization improves the reliability of communication and the integrity and accuracy of data. At the meantime uninstallation of sub-station equipment reduces investment. These measures guarantee the entirely realization of the second phase of the Nanjing distribution automation system.

Abstract:In 220 kV substations, parallel operation 220 kV Single Source loop and high voltage side of 110 kV main transformer is adopted sometimes. This paper analyses current situation of the Suqian power grid. Also, performance of wire modes of parallel operation 220 kV Single Source loop and high voltage side of 110 kV main transformer are analyzed. Based on the analysis, we suggest that it is inappropriate of using these wiring mode in the Suqian power grid.

Abstract:Due to the existence of large delay in the control of some objects, issues such as low temperature increase rate, large parameter fluctuation, and poor adaptability for different kinds of coal are frequently encountered in once-through boilers employing traditional DCS. Through analyzing the dynamic characteristics of large-scale once-through boilers and practically adopted control strategy, we have performed optical transform in the control system of 5# unit by installing the INFIT real-time control system. The basic characteristics and control logic of this system are introduced in this paper, and its effectiveness is also illustrated by using actual operation curve.

Abstract:Ultra-low emission requires that the gas temperature after desulfuration treatment should be above 80℃. Currently, the high temperature gas before performing desulfuration is used to heat the low temperature gas entering the WGGH system. It is found that when the boiler exhaust gas temper is high, the heat absorbed by the gas cooler is more than that needed for heating flue gas. Besides, large variations are also frequently encountered. For these issues, in this paper, we propose a open-cycle WGGH system, and the effectiveness of this system has been confirmed by field operational data.

Abstract:This paper presents a review of the literature about the models and methods of comprehensive evaluation on the smart grid and its key technologies. A variety of research achievements in recent years about the comprehensive models and methods for different aspects of power systems in the context of smart grids environment are introduced and discussed. The achievements include evaluation index systems, cost-benefit analysis, key technological assessment models, evaluation method and others. Moreover, current research hot spots about the comprehensive assessment for smart grids are analyzed. In addition, the properties of current achievements, problems needed to be solved and potential studying directions of the research are summarized in details.