Method for controlling an converter that is connected to a direct-current source

Abstract

Method for regulating a converter (9) connected to a direct voltage source (12) and having a disconnectable power configured to supply a distribution network (2) with a three-phase voltage Semiconductor switch (10a...10f), wherein the current flowing through each power semiconductor switch (10a...10f) is obtained under the condition of obtaining the current value corresponding to the power semiconductor switch (10a...10f). Measurement is carried out, the current value is sampled, the sampled current value is digitized under the condition of obtaining a digital current value, and the digital current value is checked by a logic implemented in the regulating unit to see whether an overcurrent occurs. conditions, wherein the power semiconductor switches (10a...10f) are switched on and off by means of the nominal operating control if an overcurrent condition is not met, and at least switched off if an overcurrent condition occurs. Turn on the power semiconductor switches loaded with a digital current value that satisfies the overcurrent condition, and after the expiration of a pulse blocking duration and under the condition of a digital current value that satisfies the overcurrent condition, turn on all power semiconductor switches connected to the positive DC terminal (10a...10f) and disconnect all power semiconductor switches (10a...10f) connected to the negative DC terminal, or vice versa, and in which, without satisfying the digital current value of the overcurrent condition, pass again The nominal operating control controls the power semiconductor switches (10a...10f).

Description

technical field [0001] The invention relates to a method for regulating a converter connected to a DC voltage source, the converter having disconnectable power semiconductor switches which are designed to provide a three-phase voltage for a distribution network. Background technique [0002] A method for regulating a DC voltage converter is known, for example, from High Voltage Direct Current Transmission. HVDC transmission is used on the one hand to transmit electrical energy over long distances. Another application involves, for example, the coupling of grids with different three-phase voltage frequencies. For HVDC transmission, the two converters are connected to each other via a DC link or a DC link. The converters are each connected to a three-phase voltage grid and essentially consist of power semiconductor switches. Self-guiding (selbstgefuehrt) converters, ie converters with self-guiding power semiconductor switches, are increasingly used in grid coupling. This a...

AI Technical Summary

Problems solved by technology

[0013] The invention solves the above-mentioned technical problem by means of a method for regulating a converter connected to a DC voltage source, the converter having a disconnectable Power semiconductor switches, wherein the current flowing through each power semiconductor switch is measured under the condition of obtaining the current values ​​respectively corresponding to these power semiconductor switches, the current value is sampled, and the sampled current value is digitized to obtain digital current value and is checked by a logic implemented in the regulation unit for the occurrence of an overcurrent condition, wherein, in the event of an overcurrent condition not being met, switching on and off is regulated by means of rated operation The power semiconductor switch, and in the case of an overcurrent condition, at least disconnects the power semiconductor switch loaded with a digital current value satisfying the overcurrent condition, after a pulse blocking duration expires and after the overcurrent condition is satisfied Under the condition of the digital current value, turn on all the power semiconductor switches connected to the positive DC terminal and disconnect all the power semiconductor switches connected to the negative DC terminal, or vice versa. Under the condition, the regulation of the power semiconductor switch is realized again through the regulation of the rated operation

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