Due to the harmonic and low frequency heating problems occurred after the inverter transformation

there are frequent accidents on the site. For this reason

a retrofitting scheme for frequency conversion system of steam extraction power generation of steam turbines was designed. In this scheme

the drive steam turbine uses the exhaust from medium pressure cylinder as the steam source and takes 75% of the main steam turbine load as the design condition. Meanwhile

it is equipped with a small generator as the frequency conversion power supply

which replaces the conventional inverter device

so as to drive the driving motor of the auxiliaries in the power plant and realize variable speed operation of the auxiliaries. The energy efficiency analysis and economic benefit analysis show that

this scheme has great energy saving potential

and the system pipeline is relatively simple

which can effectively increase the profit of power supply and raise the economic benefit. At the same time

it avoids the comprehensive hidden dangers of safety caused by the inverter transformation.