Fully-duplicated protective redundancy system for direct-current transmission project
A DC protection system and dual protection technology, applied in electrical components, circuit devices, emergency power supply arrangements, etc., can solve problems such as difficult maintenance, refusal to operate, and unfavorable power grid operation, to avoid misoperation and prevent refusal to operate.
Active Publication Date: 2012-06-13
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD +1
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Problems solved by technology
The characteristics of the two-out-of-three redundant protection method are: each protection needs to rely on other protections to prevent errors, and the protections are interdependent and difficult to maintain
[0008] However, if one of the measuring circuits in the two sets of DC protection systems in the fully dual redundancy mode fails, the two sets of DC protection systems will refuse to operate. Therefore, the probability of failure to operate is relatively high, which is not conducive to the normal operation of the power grid.
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[0023] see Figure 4 , Figure 4 It is a structural schematic diagram of the complete dual protection redundancy system of the direct current transmission project of the present invention.
[0024] The complete dual protection redundancy system of the DC power transmission project includes: two DC protection systems 10, and a DC control system 20 respectively connected to the two DC protection systems 10; each of the DC protection systems 10 includes a logic judgment unit 101 and two measurement circuits 102, the two measurement circuits 10 are respectively connected to the logic judgment unit 101, and the logic judgment unit 101 is connected to the DC control system 20;
[0025] Each of the DC protection systems 10 includes a first working state, a second working state and a blocking state; wherein, the first working state is: when the two measurement circuits 102 output to the logic judgment unit 101 at the same time When a protection action signal is issued, the logic jud...
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The invention provides a fully-duplicated protective redundancy system for a direct-current transmission project, which is controlled by means of switching of operating states of two direct-current protective systems. When a measuring loop of one optional direct-current protective system is in failure, the direct-current protective system is switched to the second operating state, namely, the measuring loop in failure does not output protective action signals, and when the other measuring loop outputs protective action signals, a logic judgment unit outputs the protective action signals, while the protective action logic of the other direct-current protective system is unchanged. When the two measuring loops of one optional direct-current protective system are out of operation due to failure or overhaul, the direct-current protective system is shut, and the protective action logic of the other direct-current protective system is changed into that one of two measuring loops having protective action signals outputs the protective action signals. By the aid of the fully-duplicated protective redundancy system for the direct-current transmission project, direct-current transmission protection failure and maloperation can be effectively reduced.
Description
technical field [0001] The invention relates to the technical field of direct current transmission protection and control of electric power systems, in particular to a complete dual protection redundancy system for direct current transmission projects. Background technique [0002] DC transmission system protection is used to protect the DC equipment of the converter station, selectively and quickly remove the short-circuit fault or abnormal operating equipment in the system under fault or abnormal conditions, so as to prevent it from causing accidents or interfering with the normal operation of other parts of the system , to ensure the safe operation of the DC system. In addition, the protection function of the DC transmission system is also used as a backup for the control function, and its reliability has an important impact on the stable operation of the national interconnected power grid. [0003] In the HVDC transmission projects that have been put into operation and ...
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Inventor 王春成贾红舟施世鸿谭茂强樊冬梅
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD