FIELD: electricity.
SUBSTANCE: in control method of frequency converter with three-phase fully-controlled bridge rectifier and two-contact consistent inverter with resonant commutation and load in the form of parallel oscillating circuit of the first type there supplied in turn are double control pulses shifted between each other through angle φ=60°, duration τ, with α adjustment angle, to valves of rectifier and inverter, thus forming direct and return on-load voltage half-waves. At adjustment angles α>60 there supplied in turn to each adjacent valve, to the main rectifier valve which was actuated after all the others, is the third control pulse at the angle corresponding to adjustment angle of the main rectifier valve α=120°, with duration γ≤τ. Maximum adjustment angle is set on the basis of α≤90°-τ. Instantaneous voltage values are measured on capacities of filter, parallel oscillating circuit of load and all valves of inverter. The next inverter valves are actuated when positive instantaneous voltage is recovered on all inverter valves. Inverter valves are deactivated when the decreasing module of instantaneous voltage value on capacity of parallel oscillating load circuit is equal to instantaneous voltage value on filter capacity.
EFFECT: improving operating reliability of frequency converter.
2 dwg
