Intelligent bypass system for high-voltage frequency converter
A high-voltage inverter, bypass system technology, applied in the control system, electrical components, AC motor control and other directions, to achieve the effect of solving the bypass inrush current
Active Publication Date: 2012-04-18
广州智光电气技术有限公司 +1
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Problems solved by technology
[0007] Compared with the prior art, the high-voltage inverter intelligent bypass system provided by the present invention overcomes the problem of excessive inrush current generated by the motor residual voltage by synchronizing the motor residual voltage with the grid voltage when the high-voltage inverter fails, This enables a stable and safe restart of the motor
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[0011] In order to further explain the technical means adopted by the present invention and the effects obtained, the technical solution of the intelligent bypass system of the high-voltage frequency converter proposed by the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.
[0012] After the high-voltage frequency converter is out of operation due to a fault, there will be a certain amount of residual magnetism in the iron core of the motor rotor winding. The residual magnetism rotates with the rotor and cuts the stator winding, which will generate a motor residual voltage u′ on the stator side 1 , and u′ 1 The amplitude is related to the rotor remanence and rotor speed, u′ 1 The frequency is related to the rotor speed, u′ 1 The phase is related to the power-off time and the rotor speed. The residual voltage of the motor is a voltage with decreasing frequency and decreasing amplitude. ...
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The invention discloses an intelligent bypass system for a high-voltage frequency converter. The intelligent bypass system comprises a high-voltage solid soft starter, a first switch, a second switch, a first contactor, a second contactor, a third contactor and a three-phase resistor, wherein the first switch, the first contactor, the high-voltage solid soft starter, the three-phase resistor and the second switch are in series connected in turn; one end of the first switch is connected with the first contactor; the other end of the first switch is connected with the input end of the high-voltage frequency converter; one end of the second switch is connected with one end of the three-phase resistor; the other end of the second switch is connected with the output end of the high-voltage frequency converter; and the third contactor is in parallel connected between the two ends of the three-phase resistor. When a bypass circuit is processed, the first contactor is closed and the third contactor is closed; and the high-voltage solid soft starter is started and a motor is restarted, the second contactor is closed, and the first contactor and the third contactor are disconnected. By using the intelligent bypass system for the high-voltage frequency converter, the motor can be switched to a power frequency voltage to operate stably and reliably without disturbance, so that the problem that an impact current is overhigh when the bypass circuit is processed is solved.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to an intelligent bypass system of a high-voltage frequency converter. Background technique [0002] The high-voltage frequency conversion speed regulation system has been widely used in the energy-saving transformation of motors because of its superior speed regulation performance and energy-saving effect. High-voltage frequency converter usually includes two circuits of frequency conversion and power frequency. Under normal circumstances, the grid voltage is transformed through the frequency conversion circuit according to the system V / F curve and the frequency value given by the user, and then added to the motor stator side to control the speed of the motor; in the case of a fault in the frequency converter, The system adopts manual bypass or automatic bypass technology to switch to industrial frequency bypass operation. [0003] When the high-voltage inverter fails, rega...
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IPC IPC(8): H02P27/00H02P27/04
Inventor 姜新宇孙开发许贤昶邱培春
Owner 广州智光电气技术有限公司