SUBMERSIBLE ELECTRIC MOTOR CONTROL STATION Russian patent published in 2014 - IPC F04D15/00 F04D13/10 

FIELD: engines and pumps.

SUBSTANCE: control station includes rectifier 1 and DC link filter 2, inverter 3, controller 4 and outlet filter 5, the first 6 and the second 7 units of current sensors, current sensor 8. Inputs 1 - 3 of controller 4 are connected to phase power inputs of the control station. Inputs 4 and 5 of controller 4 are connected to outputs of DC link filter 2, which are connected to power inputs 8 and 9 of inverter 3. The sixth input of controller 4 is connected to output of current sensor 8, through which a conductor is routed, which attaches one of rectifier 1 outputs to the corresponding input of DC link filter 2, inputs 7-9 and 10-13 of controller 4 are connected to outputs 1-3 of the first 6 and the second 7 units of current sensors; with that, each unit of current sensors can contain 2 or 3 current sensors. Conductors are routed through current sensors of the first unit of current sensors 6, which attach output 1-3 of inverter 3 to the corresponding inputs 1-3 of output filter 5, and conductors are routed through current sensors of the second unit of current sensors 7 from outputs 1-3 of output filter 5 to outputs of the control station. Control outputs 1-7 of controller 4 are connected to the corresponding inputs 1-7 of inverter 3. Rectifier can be controllable 10, the control inputs 4-6 of which are connected to control outputs 1-3 of the control unit by rectifier 9, which is connected with its inputs 1-3 to control outputs 6-10 of controller 4 respectively. Use of current sensor 8 provides the possibility of disconnection of inverter 3 at emergency excess current, which is determined by failure of capacitors of the filter or breakdown of DC link buses 2, power modules of inverter 3, which improves reliability. Connection of informative inputs 1-3 of controller 4 to three phase power inputs of the control station (A, B, C) provides protection of inverter 3 when supply voltage exceeds allowable threshold, which improves reliability.

EFFECT: connection of informative inputs 4 and 5 of controller 4 to outputs of DC link filter provides possible voltage stabilisation at inverter 3 output by correction of pulse-width modulation, as well as provides protection of power modules when DC voltage exceeds allowable norms, which improves reliability and enlarges functional capabilities.

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