The distribution networks sometimes suffer from excessive losses and voltage violations in densely populated areas. The aim of the present study is to improve the performance of a distribution network by successively ...The distribution networks sometimes suffer from excessive losses and voltage violations in densely populated areas. The aim of the present study is to improve the performance of a distribution network by successively applying mono-capacitor positioning, multiple positioning and reconfiguration processes using GA-based algorithms implemented in a Matlab environment. From the diagnostic study of this network, it was observed that a minimum voltage of 0.90 pu induces a voltage deviation of 5.26%, followed by active and reactive losses of 425.08 kW and 435.09 kVAR, respectively. Single placement with the NSGAII resulted in the placement of a 3000 kVAR capacitor at node 128, which proved to be the invariably neuralgic point. Multiple placements resulted in a 21.55% reduction in losses and a 0.74% regression in voltage profile performance. After topology optimization, the loss profile improved by 65.08% and the voltage profile improved by 1.05%. Genetic algorithms are efficient and effective tools for improving the performance of distribution networks, whose degradation is often dynamic due to the natural variability of loads.展开更多
At the present stage, the distribution network has been in a relatively low voltage position, has become the main medium between power supply companies, customers and distribution system users, the working conditions ...At the present stage, the distribution network has been in a relatively low voltage position, has become the main medium between power supply companies, customers and distribution system users, the working conditions of distribution network system and the distribution equipment quality has high requirements, so by improving the grid requirements to improve the security of the distribution network, become Chinas current power development transition stage must attach great importance to the development goals, is also the key measures to ensure user safety. With the continuous growth of the national economy, Chinas domestic power industry development has been improved accordingly, its level is gradually to developed countries and local governments, this is mainly due to the distribution network construction, construction, management operation accumulated valuable experience, learned a lot of lessons and made significant progress, but over time, Chinas domestic distribution network operation calculation specification also need to be modified with the process of time, it is an important measure to improve the level of distribution network management, but also to reduce the negative impact and play a good role.展开更多
This paper introduces the problems emerged in the developing process of Nanning Medium-voltage distribution network to adapt the progress of HV network. These problems are: (1) unreasonable structure (large amount of ...This paper introduces the problems emerged in the developing process of Nanning Medium-voltage distribution network to adapt the progress of HV network. These problems are: (1) unreasonable structure (large amount of radical type 10 kV lines); (2) one 10 kV line for each customer (causing difficulties for line corridors); (3) circuit breaker are widely used for MV customers (result in complicated substation structure); (4) lots of overhead 10 kV lines in urban area. Ring circuit, insulated cables, load break switches, and fast acting fuses etc. advanced technologies are proposed for the retrofit of urban distribution network.展开更多
文摘The distribution networks sometimes suffer from excessive losses and voltage violations in densely populated areas. The aim of the present study is to improve the performance of a distribution network by successively applying mono-capacitor positioning, multiple positioning and reconfiguration processes using GA-based algorithms implemented in a Matlab environment. From the diagnostic study of this network, it was observed that a minimum voltage of 0.90 pu induces a voltage deviation of 5.26%, followed by active and reactive losses of 425.08 kW and 435.09 kVAR, respectively. Single placement with the NSGAII resulted in the placement of a 3000 kVAR capacitor at node 128, which proved to be the invariably neuralgic point. Multiple placements resulted in a 21.55% reduction in losses and a 0.74% regression in voltage profile performance. After topology optimization, the loss profile improved by 65.08% and the voltage profile improved by 1.05%. Genetic algorithms are efficient and effective tools for improving the performance of distribution networks, whose degradation is often dynamic due to the natural variability of loads.
文摘At the present stage, the distribution network has been in a relatively low voltage position, has become the main medium between power supply companies, customers and distribution system users, the working conditions of distribution network system and the distribution equipment quality has high requirements, so by improving the grid requirements to improve the security of the distribution network, become Chinas current power development transition stage must attach great importance to the development goals, is also the key measures to ensure user safety. With the continuous growth of the national economy, Chinas domestic power industry development has been improved accordingly, its level is gradually to developed countries and local governments, this is mainly due to the distribution network construction, construction, management operation accumulated valuable experience, learned a lot of lessons and made significant progress, but over time, Chinas domestic distribution network operation calculation specification also need to be modified with the process of time, it is an important measure to improve the level of distribution network management, but also to reduce the negative impact and play a good role.
文摘This paper introduces the problems emerged in the developing process of Nanning Medium-voltage distribution network to adapt the progress of HV network. These problems are: (1) unreasonable structure (large amount of radical type 10 kV lines); (2) one 10 kV line for each customer (causing difficulties for line corridors); (3) circuit breaker are widely used for MV customers (result in complicated substation structure); (4) lots of overhead 10 kV lines in urban area. Ring circuit, insulated cables, load break switches, and fast acting fuses etc. advanced technologies are proposed for the retrofit of urban distribution network.
