Control system and method of high-voltage inverter based on DTC algorithm

A technology of high-voltage frequency converter and control method, applied in control system, vector control system, control generator, etc., can solve problems such as slow torque response speed

Active Publication Date: 2014-08-13
SHANGHAI STEP ELECTRIC +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-voltage inverter based on the DTC algorithm in order to overcome the defect that the cascaded high-voltage inverter cannot operate at a high switching frequency and the torque response speed is very slow in the prior art control system and method

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  • Control system and method of high-voltage inverter based on DTC algorithm
  • Control system and method of high-voltage inverter based on DTC algorithm
  • Control system and method of high-voltage inverter based on DTC algorithm

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Embodiment Construction

[0059] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

[0060] Such as figure 1 As shown, the control system of the high-voltage frequency converter based on the DTC algorithm of the present invention includes a flux observer 1, a torque observer 2, a speed loop controller 3, a flux sector calculator 4, and an index number Calculation module 5, a switch vector selection module 6, a phase shift module 7, a voltage calculation module 8, a constant current controller 9 and a neutral point determination module 10, the high-voltage frequency converter for this embodiment is five cascaded High voltage frequency converter.

[0061] In this embodiment, the principle block diagram of controlling the high-voltage frequency converter by using each module of the control system is as follows: Figure 10 shown in Figure 10 in, U sa , U sb represent the components of the α-axis and β-axis o...

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Abstract

The invention discloses a control system and method of a high-voltage inverter based on a DTC algorithm. The method includes the steps that S1, three-phase output voltages and currents output by the high-voltage inverter are obtained, and the stator flux linkage of a motor is calculated; S2, electromagnetic torque is calculated according to the stator flux linkage of the motor and stator currents; S3, closed-loop PID calculation is performed on speed setting and speed feedback of the motor to generate a torque signal; S4, the flux linkage sector, in a stationary coordinate system, of the stator flux linkage is obtained through calculation according to the stator flux linkage of the motor; S5, a switching vector is calculated according to output of a flux linkage hysteresis comparator, output of a torque hysteresis comparator and the flux linkage sector; S6, phase shifting is performed on power units of the high-voltage inverter according to the switching vector based on the DTC algorithm, so that corresponding PWM signals are generated. The electromagnetic torque can be rapidly and accurately controlled, and quick responses to sudden load increasing and decreasing are achieved.

Description

technical field [0001] The invention relates to a control system and method of a high-voltage frequency converter based on a DTC algorithm. Background technique [0002] At present, the cascaded high-voltage inverter has become the mainstream topology of the high-voltage inverter, and its control method basically adopts VF control (voltage-frequency conversion control), and adopts CPS-SPWM (carrier phase shift-sine pulse width modulation) debugging method, and a few companies have developed high-voltage inverters based on vector control. However, due to the topological structure and heat dissipation requirements of the cascaded high-voltage inverter, the high-voltage inverter cannot operate at a high switching frequency like the low-voltage inverter. The fast torque response of the frequency converter, and the VF control itself is an open-loop control, resulting in slower torque response. Contents of the invention [0003] The technical problem to be solved by the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/12H02P27/08
Inventor 李兴鹤金辛海宋吉波孟庆旭张震宇吴芸
Owner SHANGHAI STEP ELECTRIC
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