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Failures during Load-Frequency Control Maneuvers in an Upgraded Hydropower Plant: Causes, Identification of Causes and Solution Proposals
Open AccessArticle

Peak Operation of Cascaded Hydropower Plants Serving Multiple Provinces

Institute of Hydropower and Hydroinformatics, Dalian University of Technology, Dalian 116024, Liaoning, China
State Grid Zhejiang Electric Power Company, Hangzhou 310000, Zhejiang, China
East China Electric Power Control Center, Shanghai 200122, China
Authors to whom correspondence should be addressed.
Academic Editor: Juan Pérez-Díaz
Energies 2015, 8(10), 11295-11314;
Received: 18 May 2015 / Revised: 28 August 2015 / Accepted: 8 October 2015 / Published: 13 October 2015
(This article belongs to the Special Issue Hydropower)
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. View Full-Text
Keywords: cascaded hydropower plants; optimal operation; peak operation; two-stage search method; multiple provinces cascaded hydropower plants; optimal operation; peak operation; two-stage search method; multiple provinces
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Shen, J.; Cheng, C.; Zhang, J.; Lu, J. Peak Operation of Cascaded Hydropower Plants Serving Multiple Provinces. Energies 2015, 8, 11295-11314.

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