Analysis of technology system (scheme) of automated turbine in the operation mode of synchronous compensator

Abstract

Analysis of the structure and parameters of the technology system (scheme) of the K-55-90 LMZ condensing steam turbine (55 MW — nominal power, 60 MW — maximum power, 8.7 MPa — initial pressure) with a developed diagram of a regenerative feedwater heating (3 heater high pressure (HHP) + 5 heater low pressure (HLP)) and single ended condenser under the Karaganda SDPS-2 (with installed capacity of 663 MW: first stage — 305 MW, the second stage — 358 MW) was carried out. Proposed and theoretically substantiated the transferring of the K-55-90 LMZ turbine (1st St.) to an automated periodic synchronous compensator mode (motor mode), with feeding of this turbine with active power from the K-50-90 LMZ (2nd station) turbine operating in the nominal mode (50 MW, 55 MW) and the feeder from the regenerative samplings (17, 18th stages (2nd TG) ), into the flowing part of the 1st TG PND, the steam for cooling the rotor of the 1st TG. In general circuitry station the turbine 1st and 2nd generators connected in parallel. The technical characteristics of the auxiliary power equipment of the first stage of turbine generators (1–4th St.), including two winding transformer T3, T4, three winding transformer T1, T2, and an autotransformer AT are given. According to the accepted estimated electrical circuit defined: 1) a short-circuit current (SCC) in the calculating (shock) critical points K1, K2, K3; 2) resistance of the system, including the resistance elements T1, T2, T3, T4. From the calculating of the equivalent resistances is determined (established) that the calculated values of SCC in shock points in the substitution scheme significantly lower than in the original scheme. From these results is clear that mode synchronous compensator for 1st turbine with its electrical recharge of turbine 2, 3, 4th generators first stage is effective for electric indicators.