THREE-PHASE BALANCING DEVICE Russian patent published in 2019 - IPC H02J3/26 

FIELD: power engineering.

SUBSTANCE: use: in electric power engineering. Three-phase balancing device is made with possibility of serial connection to three-phase alternating current network with zero wire to power lines and comprises measurement unit, control unit, as well as first, second, third and fourth power cables, each of which is configured for series connection to phases "A", "B", "C" and zero wire "0" of three-phase network. Proposed device comprises DC link made up of in-series connected rectifier bridge, filter and inverter, as well as first, second and third transformers of galvanic isolation. Measurement unit is made in form of first current sensor and first voltage sensor installed on first power cable, a second current sensor and a second voltage sensor mounted on the second power cable, a third current sensor and a third voltage sensor mounted on the third power cable, and a fourth current sensor mounted on the fourth power cable. Outputs of the first, second, third and fourth current sensors are respectively connected to the first, second, third and fourth inputs of the control unit, outputs of the first, second and third voltage sensors are respectively connected to the fifth, sixth and seventh inputs of the control unit, control unit eighth input is configured to be connected to the first, second or third power cable, the ninth input of the control unit is connected to the fourth power cable. First input of the rectifying bridge, which is also the first input of DC link, is connected to the first power cable, the second input of the rectifying bridge, which is also the second input of DC link, is connected to the second power cable, third input of rectifier bridge, which is also third input of DC link, is connected to third power cable, fourth input of rectifier bridge, which is also the fourth input of DC link, is connected to fourth power cable. First transformer of galvanic isolation is installed on first power cable, and its input is connected to first output of inverter, which is also the first output of DC link, second transformer of galvanic isolation is installed on the second power cable, input of which is connected to the second output of inverter, which is also the second output of DC link, third transformer of galvanic isolation is installed on third power cable, input of which is connected to third output of inverter, which is also third output of DC link, outputs of galvanic decoupling transformers are connected in common point connected to fourth output of inverter, which is also the fourth output of DC link, first output of control unit is connected to fifth input of rectifier bridge, which is control, second output of control unit is connected to control input of inverter.

EFFECT: high accuracy of operation of the device and reduced power losses caused by asymmetry, and as a result higher quality of electrical energy.

1 cl, 1 dwg