Fault protection method and device of power transmission system, equipment and power transmission system
A power transmission system and fault protection technology, applied in the field of power transmission, can solve problems such as threats to the safe operation of the power grid, increased system complexity, low reliability of traditional fault protection techniques, etc., to achieve the effect of improving reliability and avoiding abnormal actions
Active Publication Date: 2022-02-25
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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However, the introduction of a large number of power electronic devices in MMC-HVDC increases the complexity of the system, and due to the low inertia characteristics of flexible DC transmission, the fault develops extremely fast, which poses a potential threat to the safe operation of the power grid.
[0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: the traditional fault protection technology has the problem of low reliability
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[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0044] At present, after a fault occurs in the AC of the flexible direct current transmission system, in order to prevent a short circuit or a ground fault in the AC connection area from damaging the converter or other power equipment and affecting the normal operation of the system, it is necessary to design a protection system for judging and isolating faults. Methods and devices to ensure system security.
[0045] In the existing technology, firstly, after the AC outgoing line of the flexible DC transmission system fails, the low-voltage current limiting strategy is ado...
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The invention relates to a fault protection method and device of a power transmission system, equipment and a power transmission system. The fault protection method for the power transmission system comprises the following steps that: the initial differential current of an alternating current connection line area, the initial network side voltage of a converter transformer in the alternating current connection line area and the initial frequency of the power transmission system are acquired, one end of the alternating current connection line area is connected with a converter of the power transmission system, and the other end of the alternating current connection line area is connected with an alternating current power supply; whether the initial differential current meets a first preset condition, whether the initial network side voltage meets a second preset condition and whether the initial frequency meets a third preset condition are judged; according to each judgment result, whether the alternating current connection line area has a fault or not is determined; and an action signal is output to protection execution equipment under the condition that the alternating current connection line area has a fault, so that the alternating current connection line area is isolated from other areas of the power transmission system. By means of multi-electric-quantity protection, the abnormal action of relay protection caused by disturbance signals is avoided, and the reliability is improved.
Description
technical field [0001] The present application relates to the field of power transmission technology, in particular to a fault protection method, device, equipment and power transmission system for a power transmission system. Background technique [0002] The MMC-based HVDC power transmission system adopts fully controlled IGBT devices, the control method is more flexible, and it can solve the problem of commutation failure of conventional DC, and the demand for reactive power is small and almost contains no harmonics, which improves the efficiency of the system. Controllability and flexibility of the power system. However, the introduction of a large number of power electronic devices in MMC-HVDC increases the complexity of the system, and due to the low inertia characteristics of flexible DC transmission, the fault develops very fast, which poses a potential threat to the safe operation of the power grid. [0003] During the implementation process, the inventors found at...
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IPC IPC(8): H02H7/26H02J13/00
CPCH02H7/26H02J13/00007Y02E60/00Y04S10/20Y04S40/121Y04S10/52
Inventor 李建勋黄华王晨涛徐晟梁秉岗陈海永李倩周勇顾硕铭王和雷梁子鹏
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION