N+1 redundancy high-voltage frequency converter with double standby power units and control method

Abstract

The invention provides a N+1 redundancy high-voltage frequency converter with double standby power units, which is characterized by consisting of a multiple secondary winding transformer and 3m+2 power units, wherein the 3m+2 power units comprise two standby power units, the rest 3m power units are evenly divided into three groups, and each group respectively forms one phase line of the frequency converter by connecting m power units in series, namely a first phase line, a second phase line and a third phase line respectively; one end of one standby power unit and one end of the other standby power unit are mutually connected together and connected with one end of the first phase line, while the other ends are respectively connected with one end of the second phase line and one end of the third phase line; and one end of the first phase line, one end of the second phase line and one end of the third phase line, which are not connected with the standby power units form a triphase output end of the frequency converter. The high-voltage frequency converter realizes N+1 unit redundancy function only by the 3m+2 power units, saves one power unit compared with 3m+3 power units of the prior art, and reduces the realization cost.

Description

technical field [0001] The invention relates to a high-voltage frequency converter, in particular to a power unit capable of ensuring that it still has the rated voltage output capability when any power unit is bypassed due to a fault, that is, it has the function of "N+1 unit redundancy". High voltage frequency converter. At the same time, it also relates to the control method of this high-voltage frequency converter. It belongs to the technical field of power electronics. Background technique [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in various fields of the national economy such as metallurgy, petrochemicals, tap water, electric power and other industries, and are playing an increasingly important role. Yes, the application of high-voltage and high-power inverters is becoming more and more extensive. And by the power unit (also known as the p...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem in the prior art that the cost required to realize the N+1 unit redundant function is too high, and to provide a high-voltage inverter with an N+1 unit redundant structure and a lower cost. its control method

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