IGBT cascade speed regulation system, control method and control system thereof
A technology of cascade speed regulation and controller, which is applied in the field of winding asynchronous motor cascade speed regulation system and its control system, which can solve problems such as low power factor and achieve strong robustness
Inactive Publication Date: 2014-02-26
SICHUAN EXTREME ELECTRIC CONTROL SYST MFG
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Problems solved by technology
[0005] Aiming at the defects of the prior art, the present invention discloses an IGBT type cascade speed regulation system and a control method for realizing the controller. By using IGBT on the hardware and using SPWM or SVPWM as the modulation method, the inverter can be realized Simultaneous control of the output amplitude and phase of the converter, through internal compensation, solves the problem of low power factor
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[0027] Reference attached figure 1 , is the principle diagram of the IGBT type cascade speed regulation system of the present invention, wherein UR is a diode uncontrollable rectifier, the middle module is a Boost boost circuit, and the rear end is an IGBT three-phase fully-controlled bridge inverter circuit, and the inverter transformer T1 will The energy is directed back to the stator side of the motor.
[0028] Among them, the inductor L plays the role of filtering and energy storage, suppressing the pulsation of the rotor current, and reducing the high-order harmonic component of the stator current, and the capacitor C and the diode together form the snubber circuit of the chopper.
[0029] Among them, the working method of the speed control system is as follows:
[0030] Motor rotor voltage:
[0031] u r =sE r0 (1)
[0032] In the formula, S is the slip ratio of the motor; E r0 is the open circuit voltage of the rotor winding.
[0033] The output voltage of the di...
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The invention discloses an IGBT type cascade speed regulation system. The circuit structure is that a motor rotor is connected with a diode uncontrollable rectifier, an alternating current is rectified into a direct current; the diode uncontrollable rectifier matches a rectifier side direct current voltage with an inverter side direct current voltage through a Boost chopper circuit, and regulates the rotation speed of the motor; an inverter used at the inverter side is an IGBT fully-controlled bridge, a direct current is converted into an alternating current, and slip power is fed back to a power grid; and finally the inverter side is connected to a motor stator side through a transformer T1. Correspondingly, the invention also discloses a reactive compensation control method and a control system of the abovementioned system, the robustness is strong, the system power factor can be effectively improved and regulation effects of the rotation speed of the motor are good, and energy and electricity are saved.
Description
technical field [0001] The invention relates to a winding type asynchronous motor cascaded speed regulation system and a control system thereof, belonging to the field of motor energy-saving control. Background technique [0002] Fans and pump loads are widely used in various industrial and mining enterprises and consume a lot of power. The cascade speed control system is used to reduce the motor speed to match the actual operating speed of the fan and pump loads, which can greatly reduce energy loss. . [0003] At present, the common industrial cascade speed control systems mostly use thyristor inverters. After they are put into operation, the power factor will be greatly reduced. The reason for this analysis is that the active power will be less after the speed of the motor itself is reduced, while the reactive power (inductive reactive power) will basically remain unchanged; at the same time, the diode rectifier and the thyristor inverter work in the uncontrolled rectifi...
Claims
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Login to View More IPC IPC(8): H02P25/02H02P27/06H02J3/18
CPCY02E40/30
Inventor 黄中军冯阳王奔范月明唐川
Owner SICHUAN EXTREME ELECTRIC CONTROL SYST MFG