Control Systems for High Voltage Thyristor Arms of Ice Melting Plants on Overhead Transmission Lines

The article provides general information on ice melting plants (IMPs) on overhead transmission lines (OHL) 110, 220, 330, 500 kV and the field of their application. The relevance of the multipurpose ice melting plants (MIMPs) for OHLs 110, 220 kV and low-voltage device for melting ice (LIMD) on the wires of OHLs of small length is noted. The main elements of the IMPs, such as a thyristor controlled rectifier bridge (CRB) and an ice melting switch (IMS), are highlighted. The results of computer and physical modeling of operation of a CRB with three types of pulse-phase control systems (CPPS) are described. The shortcomings of these three CPPSs are noted, while the most effective CPPS No. 3 is highlighted. The possibility of the presence of the distortion of significant value of power during deep regulation of the rectified current from a CRB is also emphasized. An innovative system of discrete (relay) control (SCD) by the thyristor arms of a CRB and an IMS is considered, while the operability of the SCD on computer and physical models is shown.