Frequency conversion soft start policy based on torque control

A technology of torque control and soft start, which is applied in the field of electric motors, electric drives, and electric drives, can solve the problems of waste of equipment resources, large current, frequent protection actions, etc., reduce design margins, reduce starting current, and improve The effect of safety and reliability

Inactive Publication Date: 2008-03-19
GUODIAN NANJING AUTOMATION
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Problems solved by technology

However, for loads with particularly large inertia, such as heavy fans, heavy lifting and other loads, the current of the open-loop general-purpose inverter driving the motor is still large when starting, even exceeding twice the rated current value, resulting in frequency conversion. overcurrent protection of the
Therefore, it can be conclu...

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  • Frequency conversion soft start policy based on torque control
  • Frequency conversion soft start policy based on torque control
  • Frequency conversion soft start policy based on torque control

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is specifically introduced as follows:

[0022] Fig. 1 is the principle diagram of the control hardware of the frequency conversion inverter adopted in the present invention, as shown in the figure, V1-V6 are the switching devices of the frequency converter, DC is the DC power supply link of the inverter, and G is the driving input port of the semiconductor switching device, CTU, CTV, and CVW are the current sensors output by the inverter.

[0023] Figure 2 is a system diagram of the frequency conversion soft start algorithm based on torque control and flux linkage control. As shown in the figure, in the torque control start mode, the stator three-phase current of the motor M is sampled, and the current of the three-phase stationary coordinate system The value is converted to the two-phase static coordinate system, and the output voltage value of the three-phase static coordinate system is converted t...

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Abstract

The invention relates to a variable frequency soft startup strategy based on torque control. The strategy comprises sampling motor stator three-phase voltage, and converting voltage value in a three-phase stationary coordinate system to a two-phase stationary coordinate system; sampling motor stator three-phase current, and converting current value in the three-phase stationary coordinate system to the two-phase stationary coordinate system; perform integral operation based on the DC voltage of a DC converter and the switch state, and observing magnetic linkage with a magnetic linkage observer without voltage detection; observing torque with a torque observer; performing soft startup semiconductor switch algorithm based on magnetic flux control and torque control; performing space vector pulse width modulation (SVPWM) algorithm; and performing algorithm to distinguish the startup state. The invention solves large startup current problem when the open-loop converter is subjected to large load inertia, reduces the startup current of large inertia load and the preserved allowance of front end power supply design, and improves the reliability of the converter.

Description

technical field [0001] The invention relates to electric drive technology, in particular to an asynchronous motor control technology. The utility model belongs to the technical field of motors and electric drives. Background technique [0002] The application of the frequency converter has the function of reducing the starting current of the asynchronous motor to realize the soft start function. The normal starting current of an ordinary asynchronous motor is 7-8 times the rated current, and when driven by a general-purpose frequency converter, the starting current can be reduced to 1-2 times the rated current. However, for loads with particularly large inertia, such as heavy fans, heavy lifting and other loads, the current of the open-loop general-purpose inverter driving the motor is still large when starting, even exceeding twice the rated current value, resulting in frequency conversion. device overcurrent protection. Therefore, it can be concluded that the starting c...

Claims

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Application Information

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IPC IPC(8): H02P1/30H02P21/14H02P21/34
Inventor 骆皓杨志钱诗宝曹阳窦旺冯永峰
Owner GUODIAN NANJING AUTOMATION
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