METHOD FOR CONTROL OF NETWORK SWITCHING OF THYRISTOR ARMS OF RECTIFIER-INVERTER CONVERTER Russian patent published in 2020 - IPC H02M7/70 

FIELD: electrical engineering.

SUBSTANCE: proposed control method relates to electrical engineering, in particular to conversion equipment, and can be used to control rectifier-inverter converters on electric locomotives receiving power from single-phase alternating current contact network. Essence of invention consists in increase of uncontrolled opening angle α₀ thyristor arms to value, at which the discharge diode arm has time to fully receive current load from previously conducting current thyristor arms and thereby closes these spent arms. At that, supply of control pulses with opening angle α₀ on the thyristor arms that enter into operation is carried out synchronously and only after receiving a signal from the switching angle sensor, which monitors the closing of used arms. Opening of thyristor arms entering into operation, in its turn, leads to discharge diode arm closure and termination of switching process. Thus, functional purpose of opening angle is changed α₀ thyristor arms, which is used as a control pulse for switching the operating arms from the locked state to the open one for the next current rectification cycle.

EFFECT: technical result consists in development of control method with high power factor in traction mode in all voltage control zones, which is achieved due to transfer of accumulated in the circuit of rectified current of electromagnetic (reactive) energy to load by means of discharge diode arm, connected in parallel between anode and cathode buses of converter and shunting circuit of rectified current.

1 cl, 3 dwg