OMPUTER SIMULATION OF STATIC SHORT-CURRENT LIMITING DEVICES IN THE POWER SYSTEM
The article discusses the possibility of using the transformer-thyristor voltage regulator as a current-limiting device during short circuits in electrical networks. A mathematical model of discrete transformer-thyristor short-circuit current limiting device with an analog microcontroller control and locking semiconductor thyristor switched keys as a natural and artificial disconnection of thyristor keys External device (switching devices). Conducted by mathematical simulation of the modified voltage regulator shown that gates off the external device reduces the maximum current flowing in the circuit of the autotransformer, to a predetermined value. This is achieved by increasing the resistance of the inductance of the transformer, caused by opening of the primary winding. Another option is the construction of such a device with a locking keys in a natural way (in the case of locking the passage of current through zero) is not effective, due to the current increase during the half-cycle before the shutdown valve and reaches the critical values for the device installed on the input threshold. The resulting device and a description of discrete control function allows you to use the resulting program code and a power converter circuit further laboratory prototyping and modeling of 3-phase version of the device