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Line loss optimization method for parallel alternating-current and direct-current system

A technology of DC system and AC system, applied in the field of AC-DC parallel line loss optimization, can solve the problems of large transmission capacity and huge power loss, and achieve the effect of minimum total power loss and total loss rate

Active Publication Date: 2015-12-09
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

The AC-DC parallel system not only transmits a huge amount of power, but also generates a huge power loss. At present, there is no effective method for optimizing the line loss of the AC-DC parallel transmission system.

Method used

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  • Line loss optimization method for parallel alternating-current and direct-current system
  • Line loss optimization method for parallel alternating-current and direct-current system
  • Line loss optimization method for parallel alternating-current and direct-current system

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Embodiment Construction

[0029] The content of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The invention reduces the active power loss of the entire inter-regional power grid by coordinating the active transmission power of the AC-DC parallel lines, that is, by adjusting the transmission power between the AC-DC systems and within the DC system.

[0031] A method for optimizing line loss of an AC / DC parallel system, comprising the following steps:

[0032] 1. Optimization and coordination of DC internal transmission power. DC system losses are mainly concentrated in converter stations and transmission lines, such as figure 2 shown.

[0033] 2. Calculate the loss rate ξ of the DC line transmission power i :

[0034] ξ i = I i 2 R ...

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Abstract

The invention provides a line loss optimization method for a parallel alternating-current and direct-current system. The method comprises the following steps: (1) calculating the loss rate xii of transmitting power of a direct-current transmission line; (2) calculating the loss rate etai of a direct-current system; (3) establishing a minimum direct-current loss value optimization model fmincon(x); and (4) establishing a minimum total rate loss value optimization model fmincon(y) of the parallel alternating-current and direct-current system. The line loss optimization method is applied to a parallel alternating-current and direct-current cross-regional transmission system; a minimum alternating-current and direct-current total rate loss value optimizing model is established between an alternating-current power transmission system and a direct-current power transmission system; the optimal power distribution of the alternating-current system and the direct-current system can be accurately calculated; and the minimum power total loss and total loss rate of the cross-regional transmission system are achieved.

Description

technical field [0001] The invention relates to a high-voltage power transmission system, in particular to a method for optimizing the loss of an AC-DC parallel line. Background technique [0002] AC-DC parallel grids are very common in cross-regional power transmission systems. With the rapid development of DC transmission systems, DC transmission has surpassed AC systems in terms of scale and capacity in cross-regional power transmission. The AC-DC parallel system not only transmits a huge amount of power, but also generates a huge power loss. At present, there is no effective method for optimizing the line loss of the AC-DC parallel transmission system. Contents of the invention [0003] In view of the above deficiencies, the object of the present invention is to provide a method for optimizing the line loss of an AC-DC parallel system. The optimal power allocation of the DC system minimizes the total power loss and total loss rate of the cross-regional transmission sy...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/36G06Q10/04G06Q50/06
CPCY02E40/70Y02E60/60Y04S10/50
Inventor 彭光强王学之何竞松陈欢国建宝张楠王海军
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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