Interval Power Flow Method for AC/DC Hybrid Transmission System Based on Confidence Transformation
A technology for AC/DC hybrid and power transmission systems, which is applied to AC network circuits, AC networks with the same frequency from different sources, circuit devices, etc., and can solve problems such as the uncertainty of AC/DC hybrid systems.
Active Publication Date: 2019-12-31
国网江西省电力有限公司经济技术研究院 +1
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[0005] The purpose of the present invention is to propose an interval power flow method for the AC / DC hybrid transmission system based on confidence transformation in order to solve the uncertainty problem of the AC / DC hybrid system
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[0081] The present invention will be described in detail below in conjunction with the embodiments of the present invention.
[0082] In this embodiment, an interval power flow method for an AC / DC hybrid transmission system based on confidence transformation includes the following steps:
[0083] 1) Initialization. Read in the AC and DC system parameters, give the initial values of the original and dual variables, initialize the number of iterations iter, etc.;
[0084] 2) Determine the interval distribution of load power in the Chinese formula (6) of the content of the invention, and substitute it into the optimal power flow model of the AC-DC hybrid connection of the Chinese formula (1)-(5) in the content of the invention;
[0085] 3) Using the Chinese formula (11)-(12) of the content of the invention to carry out the confidence transformation of the IOPF model, setting the confidence value, and deterministically transforming the original interval problem;
[0086] 4) Ap...
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An interval optimal power flow (IOPF) method for an AC-DC hybrid power transmission system based on confidence transformation comprises the following steps: (1) establishing an IOPF model of the AC-DC hybrid power transmission system based on uncertain variables in an AC / DC interval parameter formal specification system, deriving adaptability of a confidence transformation method to transform the interval optimization model into a determinant mathematics model, thereby realizing interval uncertain variables-contained constraint transformation, (3) solving the transformed determinant model through a prediction-correction method of primal-dual interior point, calculating affine direction through the correction equation, obtaining the correction direction by back substitution of the obtained affine perturbation factors, and finally obtain the correction amount. The PDT method adopted in the invention has high efficiency of transformation of the uncertainty problem, and the deterministic transformation of the interval uncertain variable can be made flexibly and conveniently. The interval optimization result can provide important references to decision makers for reasonable risk control and planning of an AC / DC hybrid transmission system.
Description
technical field [0001] The invention relates to an interval power flow (IOPF) method for an AC / DC hybrid power transmission system based on confidence transformation, which belongs to the technical field of electric power transmission. Background technique [0002] HVDC transmission not only has rapidity and flexibility in power control, but also has obvious advantages in long-distance cross-regional and large-capacity transmission of electric energy. It has become an important way of modern grid interconnection. In 2020, the State Grid will build the "Sanhua" UHV synchronous grid backbone grid, build the "four vertical and seven horizontal" UHV target grids and 21 circuits of UHV DC, and the UHV AC-DC hybrid system will play an important role in high-voltage power transmission. The DC system has gradually become one of the key factors affecting the planning and operation of the power system. [0003] In addition, due to equipment failure or maintenance, errors in system pa...
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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 朱文广程虹肖园陈会员郑春李海坤
Owner 国网江西省电力有限公司经济技术研究院