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Multi-objective power flow optimization method of VSC-HVDC (voltage source converter-high voltage direct current) containing alternating-current/direct-current system

A technology of AC and DC systems and optimization methods, applied in the field of safe operation and stability of power systems, can solve problems such as multi-objective power flow optimization of unseen systems, single-objective power flow optimization of AC and DC systems, etc.

Inactive Publication Date: 2016-02-10
NORTHEAST DIANLI UNIVERSITY +1
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Problems solved by technology

However, the current existing methods only perform single-objective power flow optimization for AC-DC systems containing VSC-HVDC, and so far there has been no research report on multi-objective power flow optimization for this system

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  • Multi-objective power flow optimization method of VSC-HVDC (voltage source converter-high voltage direct current) containing alternating-current/direct-current system
  • Multi-objective power flow optimization method of VSC-HVDC (voltage source converter-high voltage direct current) containing alternating-current/direct-current system
  • Multi-objective power flow optimization method of VSC-HVDC (voltage source converter-high voltage direct current) containing alternating-current/direct-current system

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Embodiment Construction

[0065] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0066] see figure 1 , a kind of AC-DC system multi-objective power flow optimization method containing VSC-HVDC of the present invention, comprises steps as follows:

[0067] Step 1: Build the model, select the variables to be optimized, the optimization goal and determine the constraints. The process is as follows:

[0068] i) Select the variable to be optimized, the variable to be optimized is the variable in the AC-DC system, and the continuous variable mainly includes the active output of the generator P G and machine terminal voltage V G , the active power P of the AC system flowing into the converter transformer s and reactive power Q s , the discrete variables mainly include the transformer ratio K T and r...

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Abstract

The invention discloses a multi-objective power flow optimization method of a VSC-HVDC (voltage source converter-high voltage direct current) containing alternating-current / direct-current system, which is characterized by comprising the following steps: establishing a model, selecting to-be-optimized variables and optimization objectives, and determining constraint conditions; setting an initial variable, and giving a to-be-optimized variable range; under the condition of taking the to-be-optimized variables as population individuals in the optimization process, in a hybrid encoding mode, randomly generating an initial population according to the to-be-optimized variable range; calculating the power flow of the alternating-current / direct-current system by using an alternate iterating algorithm; getting the corresponding optimization objective function value of each individual in the population; carrying out rapid non-dominated sorting on the individuals in the population, calculating a virtual fitness, and through selection, crossing and variation processing, generating sub-populations; retaining excellent individuals in parent individuals by using an elitist strategy; judging whether algorithm termination conditions are satisfied, if so, turning to a step 9), and completing optimization; otherwise, turning to the step 4); completing the optimization process, and outputting results. The method has the advantages of scientificity, strong applicability, good effect, and the like.

Description

technical field [0001] The invention relates to a multi-objective power flow optimization method for an AC-DC system including a VSC-HVDC, and belongs to the technical field of safe operation and stability of a power system. Background technique [0002] Optimal Power Flow (OPF) in power system has always been an important basic means to ensure the safe and economical operation of power system. With the interconnection of AC and DC power grids, the reform of power marketization and the integration of large-scale distributed renewable energy into the grid, the system operation is increasingly approaching its stability limit. Therefore, the traditional single-objective power flow optimization with the smallest active network loss or power generation cost can no longer meet the requirements of intelligent power generation. grid needs. In this context, multi-objective optimal power flow (Multi-objective OPF, MOPF) has been favored by researchers at home and abroad because it ca...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06
Inventor 李扬李亚辉李国庆王振浩王朝斌辛叶春王鹤
Owner NORTHEAST DIANLI UNIVERSITY
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