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Three-phase current reconstruction method using single sampling resistance

A three-phase current, sampling resistance technology, applied in the estimation/correction of motor parameters, electrical components, AC motor control, etc. It can solve the problems such as the narrow application scope of the construction method, and achieve the effect of novel control method, wide application range, and improved accuracy and versatility.

Active Publication Date: 2013-07-10
SINO WEALTH ELECTRONICS
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Problems solved by technology

[0005] 3: The biggest problem with single-resistor sampling lies in sector boundaries and low modulation, such as Figure 4 As shown, only one valid vector can be collected, or even none can be collected, and reconstruction is required
Although this method can reconstruct the current, it will inevitably lead to a large increase in harmonic content, motor heating, torque ripple, and reduced operating efficiency
[0012] 3: The current current reconstruction method has a narrow application range, the sampling accuracy at the high and low modulation degree and the sector junction is not high, and the adaptability to various SVPWM modes is not strong

Method used

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[0056]The present invention will be further described below in conjunction with specific embodiment and accompanying drawing, set forth more details in the following description so as to fully understand the present invention, but the present invention can obviously be implemented in many other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

[0057] In the three-phase inverter system, only a single sampling resistor is connected in series on the DC bus side of the inverter, and the three-phase current is reconstructed through the current on the bus, and the motor control algorithm can be realized on this basis.

[0058] Figure 10 It is a flowchart of a method for reconstructing the current of an induction motor usin...

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Abstract

The invention provides a three-phase current reconstruction method using single sampling resistance. The method includes the following steps: A, sampling direct-current bus current of a frequency converter; B, estimating three-phase current and counter electromotive force of an induction motor by using a state observer; C, judging whether current reconstruction is needed according to action time of effective vectors, if yes, carrying out a step D, and if not, skipping to a step G; D, observing motor current in an abnormal sampling area of the three-phase current by using the state observer; E, carrying out error control on the observed motor current; F, carrying out amplitude limiting processing on the variable quantity of the observed motor current; G, generating space vector pulse width modulation (SVPWM) signals; and H, setting time for the next time of direct-current bus current sampling, interrupting the process, and returning to the step A. According to the three-phase current reconstruction method using the single sampling resistance, accuracy and generality of current estimation are improved, the wide-range current reconstruction with various SVPWM models is precisely achieved, SVPWM voltage basic vectors are not changed, and voltage vector total harmonic distortion (THD) values are significantly reduced.

Description

technical field [0001] The invention relates to the technical field of three-phase motor control, in particular, the invention relates to a three-phase current reconstruction method using a single sampling resistor. Background technique [0002] 1: The current detection of the inverter is an important feedback link in the control system, which is related to the vector control performance and good current limiting protection ability. like figure 1 As shown, the more common current detection method is to connect the Hall sensor or sampling resistor in series with the two-phase current of the induction motor (IM), and directly sample the three-phase current. This method is simple and feasible, but it will bring about the disadvantages of cost increase and high product failure rate. [0003] 2: Connecting a single sampling resistor R in series on the DC bus side of the inverter can reconstruct the three-phase current, such as figure 2 shown. Because the three-phase current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/14H02P25/02
Inventor 万翔严励
Owner SINO WEALTH ELECTRONICS
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