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A topology that implements multiple phase current reconstruction algorithms

A phase current reconstruction and phase current technology, which is applied in the direction of motor parameter estimation/correction, can solve the problems of reduced working area and inability to perform over-modulation, etc., and achieve the effect of reconstruction

Active Publication Date: 2021-06-25
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

However, there are also certain disadvantages, mainly because the effective working area will be reduced and overmodulation cannot be performed.

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  • A topology that implements multiple phase current reconstruction algorithms
  • A topology that implements multiple phase current reconstruction algorithms
  • A topology that implements multiple phase current reconstruction algorithms

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Embodiment Construction

[0018] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0019] The invention proposes a new topology capable of realizing multiple phase current reconstruction algorithms, and simultaneously collects the sum of currents of three branches through a wire-wound current sensor. Such as figure 1 As shown, the topology includes bus positive pole, bus negative pole, power tube Q 1 ~Q 6 . The isolated current sensor, wherein: the isolated current sensor is installed in the power tube Q 1 and Q 3 Between, Q 6 and Q 2 Between and Q 4 Between the negative pole of the busbar, it is used to detect Q 1 and Q 3 Be...

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Abstract

The invention discloses a topology that can realize various phase current reconstruction algorithms, and the topology includes a positive DC bus, a negative DC bus, and a power tube Q 1 ~Q 6 , isolated current sensor, wherein: the isolated current sensor is used to detect Q 1 and Q 3 Between, Q 6 and Q 2 Between and Q 4 current to the negative pole of the busbar. Compared with the topology adopted by the traditional zero-voltage vector sampling method, the topology used in the present invention can synthesize the advantages of the previous algorithms. When the SVPWM operates in the normal region, the reconstruction of the phase current can be completed through two of the fixed sampling points, and the information of the other two sampling points can be used to correct the reconstructed phase current. When the SVPWM enters the overmodulated operating state, the existing algorithm can be used to realize the reconstruction of the phase current, which can realize the reconstruction of the phase current in the entire operating state.

Description

technical field [0001] The invention relates to a new topology for phase current reconstruction performed by a single current sensor, which can realize the effect of integrating multiple phase current reconstruction algorithms. Background technique [0002] The traditional permanent magnet synchronous motor control system has been widely used in the industrial field. Most of the existing control systems need to collect phase current information to complete the current loop control. This requires at least two current sensors to complete the sampling of the phase current. A high-precision current sensor is not only expensive, but also occupies a certain volume. Saving one current sensor will save a lot of cost and a certain space, so the single current sensor technology has become a research hotspot. [0003] The existing topologies that use a single current sensor to complete phase current reconstruction are mainly divided into two categories. One is to install the current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/14
CPCH02P23/14
Inventor 徐永向卢伟邹继斌肖利军邹继明禹国栋王文杰李堃
Owner HARBIN INST OF TECH