East China Electrical Power Control Center

Pudong District, China

East China Electrical Power Control Center

Pudong District, China
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Shen J.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Zhang J.,State Grid Corporation of China | Lu J.,East China Electrical Power Control Center
Energies | Year: 2015

The bulk hydropower transmission via trans-provincial and trans-regional power networks in China provides great operational flexibility to dispatch power resources between multiple power grids. This is very beneficial to alleviate the tremendous peak load pressure of most provincial power grids. This study places the focus on peak operations of cascaded hydropower plants serving multiple provinces under a regional connected AC/DC network. The objective is to respond to peak loads of multiple provincial power grids simultaneously. A two-stage search method is developed for this problem. In the first stage, a load reconstruction strategy is proposed to combine multiple load curves of power grids into a total load curve. The purpose is to deal with different load features in load magnitudes, peaks and valleys. A mutative-scale optimization method is then used to determine the generation schedules of hydropower plants. In the second stage, an exterior point search method is established to allocate the generation among multiple receiving power grids. This method produces an initial solution using the load shedding algorithm, and further improves it by iteratively coordinating the generation among different power grids. The proposed method was implemented to the operations of cascaded hydropower plants on Xin-Fu River and another on Hongshui River. The optimization results in two cases satisfied the peak demands of receiving provincial power grids. Moreover, the maximum load difference between peak and valley decreased 12.67% and 11.32% in Shanghai Power Grid (SHPG) and Zhejiang Power Grid (ZJPG), exceeding by 4.85% and 6.72% those of the current operational method, respectively. The advantage of the proposed method in alleviating peak-shaving pressure is demonstrated. © 2015 by the authors.


Wu H.,Dalian University of Technology | Shen J.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Lu J.,East China Electrical Power Control Center | Li G.,East China Electrical Power Control Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

Coordination is essential for alleviating the common peaking pressure of most of China's power grids by fully using load differences among multiple provincial power grids, and regulation capability differences among conventional hydropower plants, pumped-storage plants and thermal power plants. The East China Grid (ECG), one of China's regional power grids, was taken as the example. A coordination method was developed to solve short-term peak shaving operation problems of hybrid energy sources between regional and provincial power grids. The method decomposes the original problem into four independent subproblems according to the energy source types. A heuristic search algorithm, a successive search algorithm, and improved load shedding algorithm were proposed to respectively solve the pumped-storage subproblem, conventional hydropower subproblem, and thermal subproblem. Moreover, a solution framework incorporated these algorithms, where the quadratic programming algorithm is repeatedly used to allocate electric power among provincial grids after obtaining the generation schedule of each plant. The proposed method was applied to the dispatching center of ECG for scheduling its own plants. The results show that the method can effectively coordinate different peak load demands among provincial power grids and produces better generation schedules than the actual operation. ©2015 Chin. Soc. for Elec. Eng.


Shen J.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Cheng X.,Dalian University of Technology | Lu J.,East China Electrical Power Control Center | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

The inter-province and inter-region transmission of large-scale hydropower is an important way to coordinate power resources among multiple provincial power grids to meet the rapidly increasing demands for peak loads of China electrical power systems. To deal with the problem in the peak operation of cascaded hydropower plants serving multiple provincial power grids, a two-stage search method was proposed. At the first stage, a load reconstruction strategy was used to develop a total load curve based on multiple load curves of provincial power grids in order to deal with the solution difficulty caused by discrepant load values, peak, valley, etc. With the reconstructed load curve, a mutative-scale optimization method was employed to determine the generation schedules of hydropower plants. At the second stage, an exterior point search method was developed to allocate the power generations among multiple power grids. This method generated the initial solution by the load shedding method and took the load values as heuristic information to iteratively adjust the peak power transmitted to the power grids. The proposed method have been implemented to the operations of Xin-Fu cascaded hydropower plants of East China Grid and Hongshuihe cascaded hydropower plants of China Southern Grid. The results from two cases show that our method can meet the demands for peak-shaving of multiple provincial power grids, and show advantages over the actual operation. ©2014 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

On the bulk power grid platform, it is an important way to let high-efficiency power plants coordinate generations among multiple provincial power grids to meet the demands for peak loads of China's electrical power systems. Usually, the high-efficiency power plants even generators are operating in more complex transmission modes, whose power generation is transmitted to multiple provincial power grids. Because of great discrepancy in load level and load characteristics, it is difficult for power plants to follow the loads of multiple provincial power grids at the same time. This paper develops three methods for allocating power generations to optimize the peak loads among multiple provincial power grids according to the actual project of East China Power Grid. The former two introduce unitary and sectional evaluation strategies of remaining loads and formulate different quadratic programming models. The last method is a heuristic generation allocation algorithm based on the relative order strategy of loads, which sorts the current load in the load sequence for each power grid. These three methods have been implemented to the optimal operation of power plants owned by East China Power Grid. The results show that the aforementioned problem is effectively solved, meeting the demands for peak loads of multiple provincial power grids. © 2014 Chin. Soc. for Elec. Eng.


Cheng C.,Dalian University of Technology | Li G.,East China Electrical Power Control Center | Cheng X.,Dalian University of Technology | Shen J.,Dalian University of Technology | Lu J.,East China Electrical Power Control Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

With huge hydropower plants, such as Xiluodu, Xiangjiba, Nuozhadu and Jingping located in Jinshajiang River, Yalongjiang River and Lancangjiang River being completed and put into production, hydropower transmission capacity of ultra high voltage direct current (UHVDC) were expanded rapidly in China. Large-scale hydropower transportation have a strong impact on optimizing configuration of electric power resource in nationwide scope, especially absorbing hydropower for sending power grids and shaving peak load for receiving power grids. Because of the limited regulation capacity of hydropower plants, transportation schedules of hydropower are subject to operating requirement of plants itself and extra electricity in sending power grids. The "straight line" and "opposite peak shaving" transportation schedules occur frequently and have aggravated pressure to peak shaving load in receiving power grids. A new challenge for the coordinating operations is how to utilize load peak and off-peak difference and the characteristics of different power source to absorb surplus hydropower from sending power grids and to shave peak load for receiving power grids. The problem involves optimization scheduling methods, compensation mechanism and coordination strategy among regional power grids, province power grids and plants. The study for the above problems is crucial to the large-scale UHVDC hydropower absorption at the present stage and will be beneficial to rationally allocate power resource, alleviate the pressure of the receiving power grid peak shaving, reduce the pressure of fog in these areas and ensure the safety, reliability, and economy and environmental protection of China's power grids. ©2015 Chin. Soc. for Elec. Eng.


Shen J.,Dalian University of Technology | Cheng C.,Dalian University of Technology | Wu X.,Dalian University of Technology | Cheng X.,Dalian University of Technology | And 2 more authors.
Energy | Year: 2014

There is a lack of the capacity to respond to peak loads in most provincial power grids of eastern China and coastal regions. ACDA (central dispatching authority), which is usually a regional power grid, is responsible to dispatch its own plants and allocate power generation to multiple subordinate provincial power grids for responding to their peak loads simultaneously. Hence, this paper develops an optimization model to determine the quarter-hourly generation schedules allocated for provincial power grids under a CDA. To meet the need for peak shaving, the selected objective function in the model requires minimization of the variance of remaining load that is obtained by subtracting power generation from the original load of each provincial power grid. The objectives of multiple power grids are first reduced to an equivalent scalar objective through the weighted sum method. The general quadratic and linear formulations applying to the conventional plants and pumped-storage plants are developed to respectively deal with complex composite objective and spatial-temporal coupling constraints such as multilateral electricity contracts constraints and load balance constraints. The resulting problem is finally solved via the convex quadratic optimization technique. The proposed method is applied to scheduling plants owned by the East China Grid which covers five provinces. The simulations show that the method can rationally coordinate electric power among provinces to meet different peak demands. The comparison with the conventional method further demonstrates the advantages of our method. © 2014 Elsevier Ltd.


Qiu Z.,East China Electrical Power Control Center | Han X.,East China Electrical Power Control Center | Li X.,Beijing Join Bright Digital Power Technology Company | Cui X.,Beijing Join Bright Digital Power Technology Company | Jin X.,Beijing Join Bright Digital Power Technology Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2016

The protective relaying setting calculation has encountered several obstacles, such as high calculation complexity, excessive calculation procedures and low efficiency due to the growing range of network scale and the increasingly complex operation mode when splicing graphics of different areas. This paper makes an intensive research on the integrated protective relaying graphic mosaic, and promotes a Mean Shift algorithm and hierarchical clustering algorithm based MSHC intelligent partition method for integrated protective relaying graphic. The optimal station partition could be accomplished following these three principles: the cut set is the smallest; the branch with mutual inductance is within the same sub-area and the quantity of the station within the sub-area is appropriate. Finally, the effectiveness and rapidity of this method is verified through an actual network. © 2016 Power System Protection and Control Press.

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