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Sub-module recombination based fault tolerant MMC space vector modulation method

A space vector modulation, sub-module technology, applied in control systems, AC motor control, output power conversion devices, etc., can solve the problems of fixed sub-module control, large amount of calculation, no redundant vector, etc., to achieve convenient centralized control , the effect of simplifying the implementation

Inactive Publication Date: 2019-06-28
ZHEJIANG UNIV
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Problems solved by technology

The vector decomposition method is about to carry out a series of complex decompositions of the reference voltage vector, and finally complete the final synthesis in the two-level space vector distribution, but the decomposition process is complicated and the amount of calculation is large; the method of introducing two-level space vector modulation (such as the application number Patents 201710092797.6 and 201810913697.X) can better introduce the space vector modulation method to improve the utilization rate of DC voltage, but it is limited to two-level space vectors, there is no redundant vector, the control of sub-modules is relatively fixed, and space vector modulation cannot be used Policy flexibility and redundancy

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  • Sub-module recombination based fault tolerant MMC space vector modulation method
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  • Sub-module recombination based fault tolerant MMC space vector modulation method

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[0079] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.

[0080] Such as figure 1 Shown is the MMC topology of N submodules per bridge arm, and the most conventional recombination method. Taking the combination of two sub-modules per phase as an example, the two sub-modules form one phase of the sub-unit, and the combination of three phases is a complete sub-unit. Each subunit can output 2U cap , U cap and 0 three voltages, which can correspond to three states of P, O, and N respectively, and then space vector modulation can be applied to each subunit. The sampling time of each sub-unit is staggered from each other, and the space vector modulation strategy is independently applied to control according to its own sampling reference. Finally, the swi...

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Abstract

The invention discloses a sub-module recombination based fault tolerant MMC space vector modulation method. The method comprises the following steps that (1) two or more random sub-modules in each phase of an MMC are combined to form new three-phase control units, namely, sub-units; (2) during normal operation of the MMC, a space vector modulation strategy is used to control each sub-unit independently, sampling time of the different sub-units are staggered, and the sub-modules in the sub-units and switching signals among the units take turns to keep the capacitance and voltage of each sub-module in balance; and (3) when the MMC sub-module has an open-circuit fault, the MMC structure is recombined according to the fault condition, and a redundancy vector is used as a sub-unit to ensure fault tolerance operation of the MMC. Thus, fault tolerant operation of the MCC can be realized via the flexibility of recombination and spatial vector modulation without extra redundancy backup and peripheral circuits.

Description

technical field [0001] The invention belongs to the field of modulation strategies of power electronic equipment, in particular to a fault-tolerant MMC space vector modulation method based on sub-module reorganization. Background technique [0002] MMC is considered by scholars to be one of the most typical power electronic conversion topologies for medium and high voltage applications in the future, and has achieved rapid development in the field of flexible direct current transmission. MMC not only has the advantages of highly modular structure, low switching frequency, low output harmonic content, and easy expansion of power level, but more importantly, its DC side can be powered by a common DC bus without bulky and expensive phase-shifting transformers , so that the overall structure of the system is simpler. [0003] The modulation strategy is the basis for the normal operation of the MMC and has a direct impact on the harmonics of the output voltage of the MMC. At pr...

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Application Information

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IPC IPC(8): H02M7/5387H02M7/49H02P27/06
Inventor 白志红陈浩奇马皓
Owner ZHEJIANG UNIV
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