Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation
As the largest global renewable source, hydropower is a useful supplement to mountainous distribution networks with abundant water resources, and shoulders a large portion of the regulation duty in many power systems. In particular, in the form of decentralized energy sources located to their custom...
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doaj-805f5ce3540e4ebaae4cbf5e829a38ff2020-11-25T01:16:08ZengMDPI AGProcesses2227-97172019-06-017632810.3390/pr7060328pr7060328Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated OperationZifan Zhang0Zhidong Wang1Zhifeng Chen2Gan Wang3Na Shen4Changxing Guo5School of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaSchool of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaSchool of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaSchool of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaSchool of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaSchool of Electrical Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, ChinaAs the largest global renewable source, hydropower is a useful supplement to mountainous distribution networks with abundant water resources, and shoulders a large portion of the regulation duty in many power systems. In particular, in the form of decentralized energy sources located to their customers, small hydropower (SHP) improve grid stability by diversifying the electricity system and reducing power loss. The mountainous distribution networks supplied by small hydropower are closed-loop design but open-loop operation, which easily causes the tripping of tie line even further the off-grid operation of small hydropower system. Once the tie line trips, the current countermeasures—such as hydropower shutdown and load shedding—do not fully guarantee the reliability of power supply and the utilization efficiency of hydropower. This paper studies the amplitude-frequency characteristics of SHP off-grid, according to the typical integration of hydropower in South China, a SHP on-grid/off-grid model is established based on the Power Systems Computer Aided Design (PSCAD) platform. It is found that due to the inertia of SHP, the amplitude-frequency characteristics of SHP island system are relatively slow, and the process of non-synchronization with the main grid is gradually expanded. The characteristic of SHP has a certain degree of synchronization with the main grid in the initial island operates stage, which helps to find a novel grid connection method. This paper further proposes the strategy of using fast busbar automatic transfer switch (BATS), which quickly connect the trip-off SHP to the distribution network under the condition of permitting distributed energy grid-connected. The PSCAD simulation results show that proposed strategy has a limited impact on the power grid and prove the effectiveness of the method.https://www.mdpi.com/2227-9717/7/6/328small hydropowerisland operationgrid-connected strategy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zifan Zhang Zhidong Wang Zhifeng Chen Gan Wang Na Shen Changxing Guo |
spellingShingle |
Zifan Zhang Zhidong Wang Zhifeng Chen Gan Wang Na Shen Changxing Guo Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation Processes small hydropower island operation grid-connected strategy |
author_facet |
Zifan Zhang Zhidong Wang Zhifeng Chen Gan Wang Na Shen Changxing Guo |
author_sort |
Zifan Zhang |
title |
Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation |
title_short |
Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation |
title_full |
Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation |
title_fullStr |
Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation |
title_full_unstemmed |
Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation |
title_sort |
study on grid-connected strategy of distribution network with high hydropower penetration rate in isolated operation |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2019-06-01 |
description |
As the largest global renewable source, hydropower is a useful supplement to mountainous distribution networks with abundant water resources, and shoulders a large portion of the regulation duty in many power systems. In particular, in the form of decentralized energy sources located to their customers, small hydropower (SHP) improve grid stability by diversifying the electricity system and reducing power loss. The mountainous distribution networks supplied by small hydropower are closed-loop design but open-loop operation, which easily causes the tripping of tie line even further the off-grid operation of small hydropower system. Once the tie line trips, the current countermeasures—such as hydropower shutdown and load shedding—do not fully guarantee the reliability of power supply and the utilization efficiency of hydropower. This paper studies the amplitude-frequency characteristics of SHP off-grid, according to the typical integration of hydropower in South China, a SHP on-grid/off-grid model is established based on the Power Systems Computer Aided Design (PSCAD) platform. It is found that due to the inertia of SHP, the amplitude-frequency characteristics of SHP island system are relatively slow, and the process of non-synchronization with the main grid is gradually expanded. The characteristic of SHP has a certain degree of synchronization with the main grid in the initial island operates stage, which helps to find a novel grid connection method. This paper further proposes the strategy of using fast busbar automatic transfer switch (BATS), which quickly connect the trip-off SHP to the distribution network under the condition of permitting distributed energy grid-connected. The PSCAD simulation results show that proposed strategy has a limited impact on the power grid and prove the effectiveness of the method. |
topic |
small hydropower island operation grid-connected strategy |
url |
https://www.mdpi.com/2227-9717/7/6/328 |
work_keys_str_mv |
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