Abstract
In terms of large-scale integration of renewable energy into the grid, DC grid technology has obvious advantages over traditional AC grids. The good operation of a DC grid depends on effective control of power flow distribution. However, the adjustment of the bus voltage and its total power by the converter station alone cannot guarantee the control of all branches of the power grid. Therefore, it is necessary to install a DC power flow controller to achieve a reasonable distribution of line flow. This article is aimed at the multi-terminal DC grid, based on the basic power flow calculation method, considers the influence of the power flow controller on the DC grid power flow calculation and adds the influence to the calculation, changing the power equation or resistance parameters of the line, thereby realizing the power flow calculation The grid power flow calculation of the controller is realized by programming in MATLAB. The proposed calculation method can lay the foundation for the power flow optimization and stable operation of the DC grid.
Highlights
In recent years, with the increasingly serious problems of fossil fuel consumption and environmental pressure, China and even the whole world are facing energy problems, and the future renewable energy will become the main force of primary energy [1]
The traditional AC power grid only relies on AC circuit breakers to adjust the power flow of the grid, which can no longer meet the requirements for the response speed of the grid after the renewable energy is connected to the grid
This paper summarizes and classifies the existing DC power flow controllers, equates the external characteristics
Summary
With the increasingly serious problems of fossil fuel consumption and environmental pressure, China and even the whole world are facing energy problems, and the future renewable energy will become the main force of primary energy [1]. The access network of this large-scale renewable energy puts forward a higher level of traditional power equipment, grid structure, and operation technology requirements. It can smoothly access new energy, independently control active and reactive power, more flexible power supply mode and safe power flow control [2]. The establishment of a DC grid is an important development direction to realize large-scale access to renewable energy in the grid [3] In this regard, scholars proposed to use DC grid to solve this problem, which is a hot topic of discussion among many solutions [4].
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