COMPENSATED AC/DC CONVERTER Russian patent published in 2019 - IPC H02M7/06 

FIELD: electrical engineering.

SUBSTANCE: invention relates to conversion of electric energy of alternating current into direct current energy using valve converters with increased energy indices and can be used for electric power supply of DC electric energy consumers, in particular, railway and municipal electric transport at traction substations of direct current. In compensated converter of AC voltage into DC voltage converter, comprising power transformer with one three-phase mains and two three-phase gate windings, one of which is connected to star, and other is to shear secondary phase voltages on ±30 e. deg. triangle, two rectifying bridges, direct current outputs of which are connected to output terminals, and compensating device, which includes three-phase capacitor bank and three-phase reactor, which magnetic conductor is divided into two parts, the first of which comprises: the first three-phase winding of the reactor, which is connected to the open star and connected phase-by-phase between one gate winding of the power transformer and the input of the first rectifying bridge, and the second three-phase winding of the reactor connected to the input current shifting of the first rectifying bridge by m 30 e. deg. triangle, and the second part is laid with: the third three-phase winding of the reactor, which is connected to the open star and connected phase-by-phase between the other gate winding of the power transformer and the input of the second rectifying bridge, and a fourth coil of the reactor, connected in a star and connected in series with the second coil of the reactor, and to connection points of the second and fourth windings three-phase capacitor bank is connected, first and third windings are made with equal number of turns, and second winding is made with number of turns of greater than fourth winding, three-phase mono-harmonic resonance filters of eleventh k = 11 and thirteenth k = 13 harmonics in form of series-connected in each phase of reactor and capacitor bank are connected at input of power winding of power transformer, and their parameters in the rated operating mode of the converter are selected only from the filtration conditions of the eleventh and thirteenth harmonic of the network current, respectively, corresponding to the minimum installed power of the resonance circuit generating the filters in accordance with the following relationships:

where k = 11 or 13; U is actual value of phase voltage on transformer network winding; I_(k) – effective value of the eleventh or thirteenth harmonics of the mains current in the rated mode of the compensated converter operating without input filters (is set either by design or experiment); ω – circular frequency of supply circuit voltage. First and second rectifying bridges with respect to load are connected either in series or in parallel.

EFFECT: creation of a compensated converter with high energy indices, simultaneously solving problems of standardization of qualitative indicators of electric energy in a supply network and compensation of reactive power of idle speed of a power transformer in conditions of absence of current load in a direct current circuit.

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