Time filter

Source Type

Liu K.,Dalian University of Technology | Wu X.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Cai J.,Yunnan Power Dispatching Center | Chen F.,Dalian University of Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2016

To solve the problem of operational cooperation faced by large-middle scale hydropower when numerous small hydropower who connecting the grids, a model for the optimal operation of the large-middle scale hydropower under the limitation of transmission capacity while transmitting via grids with small hydropower in given areas was proposed. The proposed method regards the maximum absorption of hydroelectricity as the optimal objective under the constraints of transmission capacity, and the model is based on the correlation analysis of the regional flow of large-middle scale hydropower and the load of small hydropower. Moreover, the index and the relative analysis method for the increasing absorption of hydroelectricity along with the improved transmission capacity were developed. The numerical results from Dehong, Yunnan illustrates the proposed method can effectively facilitate the absorption of hydroelectricity, which contributes to the benefits of cooperation among large-middle scale and small hydropower while perfectly considering the limitation of transmission capacity. Furthermore, the proposed index and analysis method can offer useful advices for the expansion of transmission capacity, which takes account of the characteristics of long-term generation ability of small hydropower. © 2016 Chin. Soc. for Elec. Eng.


Wang J.,Dalian University of Technology | Liao S.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Cai H.,Yunnan Power Dispatching Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

This paper presents a hybrid search algorithm for the optimization problem of medium-term thermal power boot. The algorithm uses actual demand as the point of departure and equal capacity utilization hours of all thermal power plants as the goal. The algorithm consists of two steps. In the first step we get initial solution by heuristics. In the second step vertical search and lateral search are combined to find global optimal solution. At this step, vertical search is based on progressive optimality algorithm and lateral search is used to jump out of local optimization. The algorithm has the merits with simple process, quick convergence and avoiding local optimum. The actual data is used in a system with 9 power stations and 27 units to verify the algorithm. The results demonstrate the real-time processing capacity and accuracy can satisfy the actual demand. © 2011 Chin. Soc. for Elec. Eng.


Liao S.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Wang J.,Dalian University of Technology | Cai H.,Yunnan Power Dispatching Center | Deng G.,Dalian University of Technology
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

According to the characteristics of medium-term thermal-unit commitments optimization, a mathematical model considering both the traditional mode and energy-saving principle is proposed, and an improved progressive optimality algorithm (IPOA) is adopted to solve the model. The algorithm takes the initial feasible solution from heuristics search as the basis, and the progressive optimality algorithm(POA) is adopted to improve it. At the same time, the strategies for system operating capacity equalization and single station operating peak combination are adopted to move the target solution from the boundary constraints along the target isopleths into the feasible solution's interior to provide search space for iterative loop and overcome the disadvantage of POA that is apt to fall into local optimum. In the process of algorithm implementation, the local verifying tactics are adopted to simply judge the constraints of peak and valley duration of unit commitment capacity to reduce the calculation cost. Case studies with Yunnan power grid are given to verify the proposed model and algorithm. © 2010 State Grid Electric Power Research Institute Press.


Liao S.,Dalian University of Technology | Gao S.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Cai H.,Yunnan Power Dispatching Center | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

Problems in the management of medium-sized and small hydropower systems are analyzed, and the general design scheme of developing medium-sized and small hydropower management systems based on the MVC model by adopting the Rich Internet Application (RIA) technology is put forward. The developing target, main framework, and function structure of the system are discussed with emphasis on the key techniques in the design and realization of the management system. A medium-sized and small hydropower management system is designed and developed based on the RIA technologies and is successfully applied to the management of medium-sized and small hydropower in Yunnan Province. Actual operation results show that the hydropower management system based on RIA under discussion can significantly improve the management efficiency and enhance the automation level of power dispatching. © 2011 State Grid Electric Power Research Institute Press.


Li S.,Dalian University of Technology | Liao S.,Dalian University of Technology | Li G.,Dalian University of Technology | Cheng C.,Dalian University of Technology | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

This paper presented a province-district integrated generation scheduling compilation method for large-scale small hydropower station group. The approach was developed to handle current problems of small hydropower: disorderly management, striking waste of water and seriously abandoned electricity. This proposed method standardized the generation scheduling compilation flow of small hydropower by the idea of hierarchic building and management based on the scheduling relation of small hydropower. The tie-line section security constraint was added into the flow and an adjusting original schedules procedure of overload section was proposed. By the closed-loop mode of reporting proposed generating curves, checking transmission section security, distributing coordinate generating curves, the accuracy of power generation scheduling of small hydropower was increased effectively. The method had been applied to the small hydropower management system of Yunnan power grid. The feasibility and effectiveness of this algorithm has been verified available by the practical engineering. © 2012 Chinese Society for Electrical Engineering.


Shen J.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Li W.,Dalian University of Technology | Cheng X.,Dalian University of Technology | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

The complicated temporal coupling constraints greatly restrict the solving of large-scale short-term hydro scheduling problems. A mutative scale optimization method was developed to efficiently treat these constraints. The method enlarged the time step of the original problem for weakening even eliminating the temporal coupling constraints. Its final purpose was to enhance the convergence speed of solution algorithm and improve the poor solutions of the problem. During the solution process, a series of optimization problems with same operational horizon, objective and demands but different longer time steps were first generated according to the original problem, and then solved in descending order of time step. The initial solution for each problem depended on the optimized power generation of last problem with longer time step. The whole process will not terminate until the original problem with the shortest time step was addressed. The optimization of hydropower system operation in Yunnan Power Grid was used to test the mutative scale method. The simulation operation results show that the proposed method is capable of producing better solutions and cost less time than conventional single-scale optimization method. © 2014 Chin. Soc. for Elec. Eng..


Chen F.,Dalian University of Technology | Li G.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Li X.,Yunnan Power Dispatching Center
World Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems - Proceedings of the 2015 World Environmental and Water Resources Congress | Year: 2015

Southwestern China has experienced an imbalance growth between power supply and load demand for last decade. Meanwhile the construction of transmission lines is far behind the power supply growth. They together contribute to multistage congestion problem which threaten the reliability and stability of the power grid in wet season. This paper presents a method for coordinating the generation schedules of hydropower system of a municipal power grid. The objective is to maximize the total energy consumed on condition that ensuring the reliability and stability of the power grid. This is achieved by conceptualizing power grid as a diagraph based on the graph theory. Depth-First-Search (DFS) and transmission-line security checking are used to analyze topology relations of the power grid and flag overload transmission lines which violate the electric power transmission restrictions. A multistage congestion coordination strategy is introduced to iteratively coordinate the initial generation schedules of power supplies sharing overload transmission lines. The proposed method has been implemented to the hydropower system of Yunnan Power Grid in since 2014. The case results show that the method is feasible and practical. © 2015 ASCE.


Gang L.,Dalian University of Technology | Benxi L.,Dalian University of Technology | Shanzong L.,Dalian University of Technology | Chuntian C.,Dalian University of Technology | Xiufeng L.,Yunnan Power Dispatching Center
World Environmental and Water Resources Congress 2013: Showcasing the Future - Proceedings of the 2013 Congress | Year: 2013

As one of the most important renewable resources, small hydropower is also an emphasized project of the Clean Development Mechanism (CDM), which has been greatly developed and of great importance to alleviate the energy crisis resulting from the rapid economic growth of China in the past few decades. The impact on power grid is more and more obvious as most small hydropower plants operate on a river run-off system and generation output variation is very large between wet period and dry period. In the meanwhile, the operation and management of small hydropower in China have many outstanding problems due to the history and other reasons. Taking Yunnan power grid as the background, in this paper attempt has been made to explain the influence on safety and stability of power grid after large-scale small hydropower in operation. First, detailed description of the situation of small hydropower in Yunnan power grid. Second, combined with the actual circumstances, analysis of the problems and challenges that the power grid faces is presented. Finally the corresponding solution measures are put forward. © 2013 American Society of Civil Engineers.


Chen F.,Yunnan Power Dispatching Center | Ding S.-M.,Yunnan Power Dispatching Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

Due to amounts of data exchange between the EMS in Yunnan Power Secondary Dispatching Center and all Power Supply Bureaus, the traditional protocols can't meet the requirements of capacity, transfer rate and easy maintenance. The TASE.2 protocol is an ideal choice as a standard, complete and efficient protocol, which could meet this requirement. It introduces the concrete information of data exchange in Yunnan Power Secondary Dispatching Center based on TASE.2 protocol, the achievement of data forwording the identification of bad data. The application of these new technologies and new ideas brings out great convenience in the system maintenance.

Loading Yunnan Power Dispatching Center collaborators
Loading Yunnan Power Dispatching Center collaborators