GRID-CONTROLLED INVERTER OF SINGLE-PHASE ALTERNATING CURRENT Russian patent published in 2011 - IPC H02M5/12 

FIELD: electricity.

SUBSTANCE: grid-controlled inverter of single-phase alternating current includes transformer having primary winding connected to supply voltage source; secondary winding made in the form of three in-series connected sections with outputs from each of them, and four chains, each of which includes pair of in-series connected controlled valves parallel connected to each other and anode inverter buses. Extreme points of chains are connected by means of those buses to in-series connected smoothing coil, generator and ballast resistor, and middle points are connected to the appropriate outputs of sections of secondary transformer winding. In order to achieve the effect, non-controlled valve - diode, which is connected through cathode to anode bus, and through anode to cathode bus of inverter, is also introduced. Use of invention allows increasing power factor in nominal mode in all control zones from 0.7 to 0.84. Besides, average value of rectified voltage of inverter increases per each half-period in control zones 1, 2, 3, 4, and thus, electric energy flow of generator to mains increases by 15%.

EFFECT: improving power factor in nominal mode in control zones 2, 3, 4 owing to decreasing margin angle δ, which is specified by decrease of commutating angle of large circuit γ, at maintaining voltage regulation in those zones in wide range, and in the first zone due to decrease of margin angle δ, which is specified by decrease of commutating angle γ.

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