Commutation failure suppression method and system based on current change rate
A technology of current change rate and commutation failure, applied in the field of power transmission and distribution, can solve the problems of flexible DC without communication exchange and lack of coordinated control of flexible DC
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[0021] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0022] See figure 1 , Is a schematic diagram of the structure of the hybrid back-to-back DC system applied in the present invention, a commutation failure suppression method based on the rate of current change, applied to a back-to-back DC transmission system with flexible DC and conventional DC running in parallel. The units are located in the same converter station, and they share the converter bus of the same AC system, see figure 2 , The method includes the following steps:
[0023] Step 1. Take the derivation of the DC current measured in the conventional DC unit control system with respect to time and multiply it by the additional power coefficient to obtain the ad...
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