A Calculation Method for MMC Sub-module Redundant Configuration and Reliability
A redundant configuration and reliability technology, applied in the field of power transmission and distribution, can solve the problems of complex decision-making process, no evaluation of redundant sub-module SM efficiency redundancy mechanism, etc., and achieve the effect of increased reliability
Inactive Publication Date: 2015-12-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
However, it does not evaluate the efficiency of each redundant sub-module SM and propose an effective redundancy mechanism
Generally speaking, more redundant modules mean higher system reliability, and the optimal selection of redundant modules needs to consider the initial investment cost and operating cost of customer needs, however, this also leads to a very complicated decision process
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[0036] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0037] figure 1 It is a topological structure diagram of the modular multilevel converter MMC provided by the present invention. figure 1Among them, A, B and C represent the three phases of the AC side of the modular multilevel converter MMC; SM1, SM2, ..., SMN, SMN+N 0 Indicates the 1st, 2nd, ..., N, ..., (N+N 0 ) redundant submodules, of which there are N 0 redundant sub-modules; L represents the arm reactor; U dc Indicates the voltage difference between the positive and negative DC bus bars of the modular multilevel converter MMC.
[0038] figure 2 It is the reliability R of the modular multilevel converter provided by the present invention MMC with N 0 Variations in the fitted curve plot. figure 2 in, R ...
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The invention discloses a calculation method of the redundancy configuration and reliability of an MMC (Multi Media Card) submodule. The technical scheme comprises the following steps of according to a practical project, establishing a relation model between redundancy number and reliability, fixing the number of submodules of each bridge arm of an MMC and the reliability of single submodule (SM), and calculating to obtain the reliability value of a series of modular multi-level converter MMC; obtaining a fitting function according to polynomial least squares fitting method; obtaining two critical points and taking the critical points as the reference value of the redundancy configuration of the practical MMC engineering submodule; and obtaining the gradient RRI between line segments of the two critical points according to the calculation formula of the reliability of the MMC. The calculation method has the beneficial effects that the average efficiency of the redundancy submodule can be precisely calculated, and the redundancy value recommended in engineering is provided for two submodules (SM).
Description
technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a redundant configuration and reliability calculation method of MMC sub-modules. Background technique [0002] Modular multilevel converter MMC has been successfully used in high-power converters, and is currently mainly used in high-voltage direct current (HVDC) transmission systems. Compared with the traditional voltage source converter-based VSC-HVDC, the MMC-HVDC-based MMC has many advantages: full control of the AC side and DC side, no capacitors for the DC bus, redundant operation in the event of power electronics failure capability without filters etc. In 2010, the first commercialized MMC-HVDC project "TransBayCableProject (TBC)" was put into operation in the United States, with a maximum operating DC voltage of ±200kV and a maximum transmission capacity of 400MW. In addition, more than 4 MMC-HVDC projects around the world will be...
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IPC IPC(8): G06F19/00
Inventor 赵成勇王朝亮许建中李探刘文静
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)