DTC magnetic linkage estimation filtering method with compensation ability

A technology of compensation ability and flux linkage, applied in observer control, estimation/correction of motor parameters, electrical components, etc. Contradictions and other problems, to achieve the effect of improving accuracy and improving closed-loop control accuracy

Active Publication Date: 2010-07-14
GUODIAN NANJING AUTOMATION
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Problems solved by technology

But the use of the high-pass filter brings a new problem - compared with the actual flux linkage, the phase and amplitude of the observed flux linkage have changed
In addition to the method of integrator combined with high-pass filter, another method of flux linkage observation adopts the combination of low-pass and pure integration. Its disadvantage is that there is a contradiction between the processing of integral drift and the processing of amplitude-phase relationship.

Method used

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  • DTC magnetic linkage estimation filtering method with compensation ability
  • DTC magnetic linkage estimation filtering method with compensation ability

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Embodiment Construction

[0023] Figure 1 is a schematic diagram of a filter that compensates for phase-frequency characteristics and amplitude-frequency characteristics. As shown in the figure, the cut-off frequency of the high-pass filter is a function of the synchronous speed of the motor. According to the current stator flux linkage speed, use the standard signal (the amplitude of the standard signal is equal to the current amplitude of the stator flux linkage, and the frequency is equal to the current rotation frequency of the stator flux linkage) to pass through the high-pass filter link to generate the compensation vector of the amplitude and phase; After the flux observation value is filtered, it is synthesized with the compensation vector to generate the final flux observation data.

[0024] Since the control cycle of the inverter to the motor is very short, it can be approximated that the stator flux trajectory is an ideal circle. According to the simulation research, in one rotation cycle of...

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Abstract

This invention relates to a method for DTC magnetic linkage observation wave-filtering, having also compensation ability. Its characteristics are: proceeding prure integrating based upon motor synchronous speed, calculating the cut-off frequency of the high-pass wave filter (HPWF); setting the time constant of HPWF; delivering signal of magnetic linkage observation value by HPWF based on the cut-off frequency and the time constant; testing the present phase frequency and amplitude frequency based on the present stator speed and standard wave-shape and amplitude; producing phase and compensation vector; synthesizing said vector and the HPWF output signal, to produce the final linkage observation value. This invention method solves the prior art method problems such as the phase and amplitude error, so, increases the precision.

Description

technical field [0001] The invention relates to a DTC flux linkage observation filtering method with compensation capability. The utility model belongs to the technical field of motors and electric drives. Background technique [0002] Due to the advantages of less dependence on motor parameters and high control robustness, the direct torque control technology of asynchronous motors has increasingly received the attention of technicians in the field of motor speed regulation. In the DTC algorithm, the voltage model flux observer, which is the easiest to implement, uses a pure integrator, which leads to the accumulation error of the integral, especially the DC bias, which will have a great impact on the observation accuracy of the flux linkage. For example, deviations in voltage sampling, current sampling, or stator resistance values ​​will lead to calculation errors, and the accumulation of errors will even cause the flux linkage observer to fail to work normally. For the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/13H02P21/14H02P23/00H02P23/12H02P23/14
Inventor 骆皓杨志钱诗宝曹阳窦旺冯永峰
Owner GUODIAN NANJING AUTOMATION
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