Operation method of high-voltage three-pole direct-current power transmission system
A technology of DC transmission system and operation method, which is applied in the direction of DC circuits with more than three wires and power transmission AC network, etc. It can solve the problems of lack of system operation control principles, inability to safely and effectively utilize the advantages of high-voltage three-pole DC transmission, and achieve improvement. Stability and reliability, avoiding commutation failure, and improving the effect of transmission power
Pending Publication Date: 2022-01-04
NR ELECTRIC CO LTD +1
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Problems solved by technology
Although the current three-pole power transmission technology has theoretical discussions and feasibility analysis, if it is to be applied in practice, it is necessary to have a comprehensive study and understanding of its various operating conditions, that is, a complete and reliable control and operation mode is required. , the existing research lacks the operation control principles of such systems, and cannot safely and effectively play the advantages of high-voltage three-pole DC transmission in practical engineering applications
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[0018] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0019] The present invention designs an operation method of a high-voltage three-pole direct current transmission system, and its transmission control system structure configuration is as follows figure 1 As shown, the voltage and current regulation characteristics of each pole are as follows figure 2 Shown (Ud and Id in the figure are DC voltage and current at various levels respectively). Including three operating modes of three-pole DC operation, bipolar DC operation and unipolar DC operation; the three-pole DC operation includes three-pole current modulation control input mode, three-pole current modulation control exit mode and three independent unipolar DC In the operation mode, in the three-pole current modulation control input mode, the current flowing through the ground electrode is kept balanced by modulating the three-pole curr...
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The invention discloses an operation method of a high-voltage three-pole direct-current power transmission system. The method comprises three operation modes, namely, three-pole direct-current operation, double-pole direct-current operation and single-pole direct-current operation. The three-pole direct current operation comprises a three-pole current modulation control input mode, a three-pole current modulation control exit mode and three independent single-pole direct current operation modes; in the three-pole current modulation control input mode, current flowing through a grounding pole is kept balanced by modulating three-pole current instructions; in the three-pole current modulation control exit mode, the three-pole direct current total power is controlled, so that the three-pole direct current total power is kept constant; in the three independent single-pole direct current operation mode, three poles are in a single-pole power / current control state; and the commutation failure is prevented by adjusting the extinction angle during normal operation and adopting commutation failure prediction control. The method solves the problem that an existing high-voltage three-pole direct-current transmission technology cannot be actually applied to engineering due to the lack of an actually available operation control method.
Description
technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to an operation method of a high-voltage three-pole direct current transmission system. Background technique [0002] The high-voltage three-pole DC transmission system is one of the best AC transmission line transformation schemes to cope with the increasing scale of the power grid at this stage. Although the current three-pole power transmission technology has theoretical discussions and feasibility analysis, if it is to be applied in practice, it is necessary to have a comprehensive study and understanding of its various operating conditions, that is, a complete and reliable control and operation mode is required. , the existing research lacks the operation control principles of such systems, and cannot safely and effectively play the advantages of high-voltage three-pole DC transmission in practical engineering applications. Contents of the i...
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IPC IPC(8): H02J1/08H02J3/36
CPCH02J1/08H02J3/36Y02E60/60
Inventor 崔龙飞胡铭邵震霞杨瑞陈志刚
Owner NR ELECTRIC CO LTD