A reliability assessment method for HVDC transmission system considering AC side faults
An AC-side fault, high-voltage DC technology, applied in electrical components, instruments, data processing applications, etc., can solve the problem that HVDC system reliability assessment is difficult to reveal and describe faults, does not consider HVDC system operating conditions, and is difficult to accurately describe HVDC system reliability. problems, such as reliability, to achieve the effect of reasonable reliability assessment.
Active Publication Date: 2018-07-24
XI AN JIAOTONG UNIV +1
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The existing HVDC system reliability evaluation methods are all based on fixed component failure rate, repair rate and installation rate, without considering the operating status of the HVDC system. Although the overall reliability index of the HVDC system can be given, it cannot accurately describe the operating conditions of the HVDC system. Real reliability level of medium HVDC system
The HVDC system reliability report released by CIGRE shows that in actual operation, more than 60% of the outages of LCC-based HVDC systems are caused by the failure of AC side equipment or auxiliary equipment, while the existing HVDC system reliability evaluation is difficult to reveal and characterize this part of the breakdown
[0006] my country's HVDC is developing rapidly, and it is playing an increasingly important role in the transmission of electricity from west to east and the large-scale development of new energy. Traditional reliability assessment methods for AC-side system faults have been difficult to accurately describe the reliability of HVDC systems in the AC-DC hybrid scenario. It is particularly necessary and urgent to study HVDC system reliability assessment methods that consider AC-side faults
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[0024] The present invention will be further described below in conjunction with drawings and embodiments.
[0025] 1. Fault model of AC equipment
[0026] According to the fault history data of the same type of equipment, the invention performs data fitting, abnormal data elimination and repair, and obtains the failure rate and average repair time of the faulty equipment. The two-state model is used to model the AC equipment. In this model, the two states refer to the running state and the out-of-service state, and the state transition rates of the two states are calculated by the failure rate and the average repair time respectively.
[0027] 2. Calculation of AC system reliability parameters and judgment of commutation failure
[0028] The invention calculates the reliability parameters of the AC system by using the time series Monte Carlo simulation method. The state duration of each component is extracted, and when the component is in a fault state, its fault type is ex...
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The invention provides a high-voltage direct-current power transmission system reliability assessment method considering an alternating-current side fault. A line commutated converter reliability modeling and probability index evaluation method is provided and is combined with an existing high-voltage direct-current power transmission system reliability assessment method, so that a problem that the influence on the high-voltage direct-current power transmission system reliability by the alternating-current side fault can not be taken into consideration by the traditional high-voltage direct-current power transmission system reliability assessment method can be solved. Therefore, precision and engineering practicability of the high-voltage direct-current power transmission system reliability assessment method can be improved.
Description
technical field [0001] The invention belongs to the field of power system reliability evaluation, in particular to the reliability evaluation of a high voltage direct current transmission system based on a current source converter. Background technique [0002] With the large-scale development of new energy power generation, the trend of spatial asymmetry between power supply and load is still intensifying, and the demand for long-distance high-power transmission of electric energy is increasing day by day. UHV AC transmission solutions can partially meet this demand, but the stability problems brought about by long-distance AC transmission are prominent, which greatly restricts its application. The problem of reactive angle stability of high-voltage direct current transmission (HVDC), as the transmission distance increases, its economy gradually exceeds that of AC transmission schemes. In addition, with the development of power electronic equipment technology, HVDC technol...
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IPC IPC(8): H02J5/00G06Q50/06
Inventor 别朝红谢海鹏郑超李惠玲宋云亭
Owner XI AN JIAOTONG UNIV