Three-phase AC voltage stabilizer
A voltage stabilizing device and three-phase AC technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc.
Active Publication Date: 2020-10-30
夏俊
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Problems solved by technology
[0004] In order to solve the problems existing in the existing compensated AC voltage stabilizer, the present invention provides a three-phase AC voltage stabilizer, including an auto-compensated three-phase main circuit unit, a compensation control unit, a trigger unit, and a protection drive unit
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[0041] The present invention will be further described below in conjunction with accompanying drawing.
[0042] figure 1 It is a block diagram of the system composition of the three-phase AC voltage stabilizing device. The compensation control unit outputs the three-phase trigger control signal P5 to the trigger unit. The three-phase trigger control signal P5 is composed of A-phase, B-phase, and C-phase trigger control signals P5A, P5B, and P5C. The trigger unit sends a trigger signal P6 to the self-coupling compensation type three-phase main circuit unit according to the input three-phase trigger control signal to control the on-off of the bidirectional thyristors in the three-phase main circuit thyristor switch groups of A, B, and C. The compensation control unit simultaneously outputs the three-phase non-trigger zone control signal P4 and the three-phase trigger gating control value discrimination signal P7 to the protection drive unit. The three-phase non-trigger zone cont...
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A three-phase AC voltage regulator comprises a self-coupled compensated three-phase main circuit unit, a compensation control unit, a trigger unit and a protection drive unit. The compensation controlunit is composed of three compensation control circuits comprising a sampling comparison circuit, a delay protection circuit, a trigger gate configuration circuit and an error detection circuit. Thethree compensation control circuits respectively perform voltage sampling on a three-phase phase voltage, and output a three-phase trigger control signal, a non-trigger zone control signal and a trigger gate control value determination signal. The protection drive unit activates or stops the protection of a three-phase thyristor switch group according to whether the trigger gate control value determination signal is valid or not. The AC voltage regulator can adjust the number of partition into which the voltage, within an AC power supply phase voltage fluctuation range, is input, and change the compensation mode and compensation accuracy. While achieving an interlock control, the AC voltage regulator also activates or stops the protection of the thyristor switch group according to whetherthe control circuit has a logic error or not, thereby effectively strengthening the protection against the abnormal in an operation process.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to a three-phase AC voltage stabilizing device. Background technique [0002] The existing compensating single-phase and three-phase AC voltage stabilizers have the advantages of wide range of voltage regulation, almost no distortion of the waveform, high overall efficiency and strong load adaptability. The principle is to automatically control the switching of different winding coils of the primary winding on the compensation transformer according to the level of the input voltage, using the ratio relationship between the primary side working winding and the secondary winding, or by adjusting the voltage applied to the primary winding , providing bidirectional and multi-level voltage compensation, so as to achieve the purpose of voltage regulation and stabilization. [0003] The disadvantage of the existing compensated AC voltage stabilizer is that when the motor is used to...
Claims
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IPC IPC(8): G05F1/20
CPCG05F1/20
Inventor 周维龙凌云文定都刘建华杨兴果
Owner 夏俊