Stabilization of the voltage of the electrical load unit by using two-operation thyristors
DOI:
https://doi.org/10.31734/agroengineering2022.26.101Keywords:
electric load node, voltage stabilization, mathematical model, two-operation thyristors, computer simulationAbstract
The article analyzes methods of voltage stabilization in the electric load node. Several methods can be used to stabilize the voltage at the node, namely to reduce transformation ratio of the power transformer or increase the voltage of the primary winding of the transformer. It is clear that the mentioned methods, on one hand, increase the voltage of the load node, and on the other hand, they increase the resistances in the transformer windings (Ohm's law). There is another method to increase the tested voltage, which consists in the additional connection of an additional line in parallel to the load node, which in general can be presented as an active-capacitive load. This approach leads to a decrease in the current in the secondary winding of the transformer, which means an increase in the voltage of the electrical load node. In the established process, such voltage stabilization was called reactive power compensation. Therefore, the main criterion for reactive power compensation in electric load nodes is reduction of the current in this node due to introduction of active-capacitive elements.
Authors of the research offer such device, which consists of an active element shunted by two two-operation thyristors connected in opposite parallel. Bi-operational thyristors make it possible to control the voltage of the element in a fairly wide range. Rectifiers based on two-operation thyristors can be conditionally considered as active-capacitive elements, i.e. sources of reactive power, according to the corresponding pulse control laws.
This article presents a constructed mathematical model of a simplified electrical load node, which consists of circuits of an active-inductive load and a bridge-type stabilizing device with two double-operation thyristors. On this basis, the issue of voltage stabilization of the mentioned node was considered. The obtained results of computer simulation of electromagnetic processes in the form of drawings are analyzed.
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