Double-circuit power control method for common-tower double-circuit direct current transmission system

Abstract

The invention provides a double-circuit power control method for a common-tower double-circuit direct current transmission system, and belongs to the technical field of direct current transmission control. The double-circuit power control method is especially suitable for double-circuit power control of the common-tower double-circuit direct current transmission system. The method includes the following steps that in the first stage, the transmission amplitude limit of a common-tower double-circuit direct current transmission project is determined, namely the first stage is an amplitude limiting link; in the second stage, double-circuit power is distributed, namely the second stage is a distribution link which includes power distribution between double-circuit direct currents and power distribution between double poles in a one-circuit direct current. According to the double-circuit power control method for the common-tower double-circuit direct current transmission system, the double-circuit direct current power can be reasonably distributed through a suitable control policy according to operation conditions of the double-circuit direct currents, coordination control over the double-circuit direct current power is achieved, general direct current transmission can be kept unchanged within a short time after failures, and losses of the transmission power can be effectively reduced.

Description

Technical field [0001] The invention is a double-circuit power control method for a double-circuit DC transmission system on the same tower, and belongs to the innovative technology of a double-circuit power control method for the double-circuit DC transmission system on the same tower. Background technique [0002] The high-voltage DC adopts the design idea of ​​double-circuit erection on the same tower, which can reasonably and efficiently utilize the resources of the ground electrode and converter station, increase the transmission capacity of the unit corridor, and reduce the construction and maintenance costs of the project. As one of the key projects of the “Twelfth Five-Year Plan” of China Southern Power Grid’s west-to-east power transmission, the right bank of Xiluodu power transmission project to Guangdong ±500kV double-circuit DC transmission project on the same tower (referred to as Xiluodu DC project) adopts two-circuits of ±500kV DC on the same tower. . The Xiluodu ...

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Problems solved by technology

[0003] Different from the previous single-circuit ±500kV DC transmission system, the Xiluodu DC project needs to realize double-circuit power control and total station reactive power control to meet the dispatching requirements for double-circuit DC power and the double-circuit DC transmission for the whole station AC filter. This also makes the control hierarchical structure of the Xiluodu DC project more complex, and the interfaces between the various control levels are also more complex

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