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Optimization control method based on optimal power flow for multi-terminal flexible direct current transmission system

A DC transmission system, multi-terminal flexible technology, applied in AC network circuits, circuit devices, power transmission AC networks, etc., can solve problems such as poor applicability, data analysis, poor results, etc., to achieve scientific and reasonable methods, good results, and applicable strong effect

Inactive Publication Date: 2016-09-28
NORTHEAST DIANLI UNIVERSITY +1
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Problems solved by technology

At present, the research on the system control method is only to analyze the converter station in the system. Although it can keep the network running more stably, it has not analyzed the data in the system, and has not carried out multi-objective power flow optimization for the AC and DC system. The operating point under optimal conditions cannot be given exactly, and there are few in-depth studies considering the application scenarios of wind farm group access, and there are deficiencies such as poor applicability and poor effect

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  • Optimization control method based on optimal power flow for multi-terminal flexible direct current transmission system
  • Optimization control method based on optimal power flow for multi-terminal flexible direct current transmission system
  • Optimization control method based on optimal power flow for multi-terminal flexible direct current transmission system

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Embodiment Construction

[0045] A control method for a multi-terminal flexible direct current transmission system based on an optimal power flow of the present invention comprises the following steps:

[0046] 1) Input the initial data of the power flow in the network;

[0047] 2) Multi-objective power flow optimization based on NSGA2 algorithm for multi-terminal flexible DC transmission system combined with wind power prediction data:

[0048] (1) Transform the multi-objective model into a single-objective model, and use the linear weighting method to convert the multi-objective model into a single-objective model; since the value of the weight coefficient directly reflects the importance of a single object in the overall model, when it is estimated for the first time, Let each weight coefficient be equal, and in subsequent iterations, adjust each weight coefficient according to the value of each single objective function;

[0049](2) To solve the single-objective power flow optimization model, due ...

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Abstract

The invention relates to an optimization control method based on optimal power flow for a multi-terminal flexible direct current transmission system. The method is characterized by comprising optimization selection on an overall control strategy for converter stations in the multi-terminal flexible direct current transmission system, and specifically comprises the steps of performing multi-target power flow optimization calculation based on an NSGA2 ((Non-Dominated Sorting Genetic Algorithm 2) on a VSC-MTDC (Voltage Source Converter-Multi-Terminal Direct Current) system; unifying three control modes of the converter stations as a generalized droop control mode by using the direct current voltage and the active power of each converter station in the optimization result as reference values of the whole multi-terminal flexible direct current transmission system, and selecting a specific control mode for each converter station by using the reference values; and optimizing, by each converter station, the control mode according to the control coefficients alpha, beta and gamma sent by an alpha-beta-gamma program, thereby realizing optimization selection on the overall control strategy for the multi-terminal flexible direct current transmission system.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission, and in particular relates to an optimal control method for a multi-terminal flexible direct current transmission system based on an optimal power flow. Background technique [0002] Flexible DC transmission is a high-voltage direct current (HVDC) transmission based on a voltage source converter (Voltage Source Converter, VSC). Multi-terminal flexible direct current transmission system (VSC-MTDC) is a flexible direct current transmission system that contains more than two VSC converter stations under the same direct current network. [0003] Power flow optimization can improve the power flow distribution of the system, adjust the control mode and control parameters of each converter station in the multi-terminal flexible DC transmission system, strengthen the safety and stability of the power grid, improve the voltage quality of the system, and reduce the operating cost of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 王鹤于华楠刘禹彤李国庆王振浩辛业春王朝斌金儒孔
Owner NORTHEAST DIANLI UNIVERSITY
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