AC-DC power grid multi-target power flow optimization method considering current power flow controller
A power flow controller and multi-objective optimization technology, which is applied in the direction of AC/DC network circuit layout, power transmission AC network, DC network circuit devices, etc. sexual effect
Pending Publication Date: 2021-11-02
NANJING UNIV OF SCI & TECH
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[0003] Most of the existing research on power flow optimization for AC and DC power grids is aimed at the AC-DC hybrid system including a simple DC grid or adding converter station control on this basis, and there is a lack of optimal power flow research for complex AC-DC hybrid systems including a power flow controller.
After adding DC CFC, the degree of freedom of system control has been increased, but at the same time, new control variables and constraint equations have been introduced, making the original optimal power flow analysis algorithm for AC and DC power grids no longer fully applicable; and because the control branch of DC CFC There is a coupling relationship between them, and the equivalent DC transformation ratio or output voltage on the controlled branch of DC CFC cannot be directly selected as the optimization variable. Therefore, it is necessary to research and develop a new power flow optimization method for AC and DC power grids that considers the role of DC CFC control
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[0082] In order to verify the effectiveness of the scheme of the present invention, a new 5-terminal 6-wire DC power grid is added to the traditional IEEE57 node system for optimal power flow analysis. as attached Figure 7 As shown, the ±200kV 5-node VSC DC grid is added to the IEEE57 node system, the reference capacity of the entire grid is set to 100MVA, and the reference voltage of the DC grid is 200kV.
[0083] Table 1 shows the control strategy and loss coefficient of the converter station in the model, where U dc is the DC side voltage of the converter station, P s , Q s is the active power and reactive power at the AC outlet of the converter station, U s is the AC side voltage of the converter station. The node types and DC system parameters on both sides of the converter station are shown in Table 2.
[0084] Table 1 Control strategy and loss coefficient of converter station
[0085]
[0086] Table 2 Node types and DC system parameters on both sides of the co...
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The invention discloses an AC-DC power grid multi-target power flow optimization method considering a current power flow controller. The method comprises the following steps of: inputting power grid initial data; carrying out initial load flow calculation on an AC-DC hybrid system; solving a power flow regulation and control domain of a DC CFC on a target installation line; constructing a multi-objective power flow optimization model, and converting multi-objective optimization into single-objective optimization by adopting a linear combination optimization method with conversion weighting; performing multi-target optimization on the selected to-be-optimized parameters by using a genetic algorithm to obtain a globally optimal solution; and updating system control parameters by using the optimal solution, and carrying out load flow calculation on the optimized AC / DC power grid containing the DC CFC. According to the AC-DC power grid multi-target power flow optimization method, the operation safety, stability and economical efficiency of the AC-DC hybrid power grid are improved.
Description
technical field [0001] The invention relates to the technical field of electric power transmission, in particular to an AC / DC power flow optimization method considering a current flow controller. Background technique [0002] The current flow controller (DC current flow controller, DC CFC) provides the possibility for the further development of the DC power grid by virtue of its powerful power flow regulation ability, simple structure and the potential to expand multiple degrees of freedom. Power flow optimization can improve the distribution of power flow in the system, improve the stability of power grid operation, and reduce the loss of system operation. It is an important subject of steady-state analysis. The DC voltage offset and the load severity of the DC line are important indicators to measure the operating status of the AC and DC grid. By adjusting the control parameters of the grid to achieve the optimal operating status of the grid and improve the safety and econ...
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IPC IPC(8): H02J1/00H02J3/00H02J3/36H02J4/00
CPCH02J1/00H02J3/00H02J3/36H02J4/00H02J2203/10H02J2203/20Y02E60/60
Inventor 甄浩王松张岱岳王谱宇杨伟
Owner NANJING UNIV OF SCI & TECH