A Flexible DC Grid Modeling Method for Fault Current Analysis
A flexible DC and fault current technology, which is applied in the direction of power transmission AC network, fault location, measuring power, etc., can solve the problem of failure to consider the function of the control system of the converter station, the large short-circuit current of the flexible DC transmission system, and the failure to consider the conversion Problems such as the dynamic process of the flow station, to achieve the effects of omitting complex analysis, good versatility, and less modification
Active Publication Date: 2020-11-10
XI AN JIAOTONG UNIV
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Problems solved by technology
The biggest problem is that the short-circuit current of the flexible DC transmission system is too large, and the existing DC circuit breaker cannot break it, so it is necessary to analyze the short-circuit current
[0004] At present, the methods for analyzing the fault current of the flexible DC transmission system all adopt the static method, that is, the equivalent transformation of the fault circuit into a series-parallel circuit of capacitance, reactance and resistance, which does not take into account the dynamic process of the converter station, nor does it take into account the control of the converter station The role of the system in the failure process
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[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0048] see Figure 9 , the present invention provides an MMC-based flexible DC grid modeling method suitable for fault current analysis, the flexible DC transmission system includes a modular multilevel (Modular Multilevel, MMC) converter station and its control system, DC A line and an AC system, the method comprising:
[0049] Step S1, identify and model the MMC con...
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A flexible DC power grid modeling method suitable for fault current analysis. First, the operator method is used to model the modular multilevel converter station to obtain its input and output characteristics; according to the input and output relationship of the MMC converter station, a MMC's flexible DC grid model analyzes the short-circuit fault current between two poles of the flexible DC grid. The invention uses an operator method to identify and model the MMC converter station, omitting the complex analysis of the internal dynamic characteristics of the converter station, and the calculation is simple and convenient. The proposed fault current algorithm is suitable for different DC grid structures. When the grid structure changes, the amount of modification of the present invention is less. At the same time, the present invention is also applicable to multiple faults of the DC grid and has good versatility.
Description
technical field [0001] The invention belongs to the technical field of power system fault analysis, and in particular relates to a modeling method of a flexible DC power grid suitable for fault current analysis. Background technique [0002] Due to the unbalanced distribution of energy in my country, long-distance and large-scale power transmission is required, and the flexible DC transmission system based on modular multi-level converter stations has a small footprint, fast dynamic response, no commutation failure, and can be independent The advantages of controlling active and reactive power are widely used in long-distance power transmission. [0003] Modular Multilevel Converter (MMC), as a new topology, still has a lot of problems to be solved in practical applications. The biggest problem is that the short-circuit current of the flexible DC transmission system is too large, and the existing DC circuit breaker cannot break it, so it is necessary to analyze the short-cir...
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IPC IPC(8): H02J3/00H02J3/36G01R31/08G06F30/18G06F113/04
CPCH02J3/00H02J3/36G01R31/088G06F30/20H02J2203/20Y04S10/52Y02E60/60
Inventor 秦博宇刘宛菘方铖
Owner XI AN JIAOTONG UNIV