Abstract
In remote areas, large power stations are often installed to supply local loads due to the difficulties of power transmission. However, with the development of renewable energies and poverty alleviation programs, many renewable energy stations have been installed in such areas. This large amount of surplus and fluctuating energy causes a poor voltage quality, and this problem is difficult to solve with traditional methods. Adding transmission lines can be a feasible solution, but the related research is limited. To provide a guideline for this solution, a network optimization algorithm is proposed in this paper. In the process, a sub-grid that is far from the national grid with an imbalanced power supply and demand is connected to the national grid directly to improve the power quality. First, the linear performance index power mileage is defined to facilitate the calculation and help denote the voltage quality. Then, an iterative algorithm is formed to perform the network optimization and automatically choose the number of clusters. A case study of an actual power grid in Chongqing, China, and an IEEE 123-bus case are used to verify our algorithm. The results show there is a great improvement in the voltage profile.
Highlights
We first introduced a mileage matrix [M]n∗n, which describes the structure of the power grid to help the calculation. n is the number of nodes and Mij equals the length of branch i if branch i is part of the path from node 0 to node j
A network optimization algorithm is proposed to present a guideline for adding transmission lines
The algorithm can automatically choose the number of sub-graphs, and the effectiveness of the terminal conditions were verified by several case studies
Summary
The sensitivity matrix was used as the distance matrix and different cluster algorithms were compared using four different performance indexes; it was found that intelligence algorithms were superior to classical clustering algorithms [14] Both the network reconfiguration and network partition help improve the power quality of the modern power grid. With the development of renewable energy generators and photovoltaic (PV) poverty alleviation programs, in China, a large number of RESs have been installed in such places, leading to surplus power energy Such surplus energy is mainly provided by the large hydro station at the end of the grid, which may lead to poor power quality and a voltage overshoot. This paper proposes a power-mileage-based network optimization algorithm to provide a guideline for how to add transmission lines.
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