Seven-phase induction machine harmonic cancellation method based on SVPWM

A technology of harmonic elimination and induction motor, used in the control of generators, motor generators, AC motors, etc., to achieve good dynamics, suppress current harmonics, and reduce switching times.

Inactive Publication Date: 2019-02-01
NANJING INST OF RAILWAY TECH
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Problems solved by technology

Two voltage vectors are used to synthesize SVPWM, the purpose of which is to reduce switching times and thus reduce switching losses. However, the application of traditional three-phase SVPWM does not consider the influence of voltage vectors in the generalized zero-sequence subspace. This patent proposes a modulation using SVPWM Method According to the idea of ​​space decoupling, while the voltage vector acts on the fundamental subspace, its projection in the harmonic subspace will generate a composite vector, and the 3rd and 5th harmonic subspaces are used at the same time by modulating the order and time of vector application The composite vector is zero to achieve the effect of eliminating harmonics

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  • Seven-phase induction machine harmonic cancellation method based on SVPWM
  • Seven-phase induction machine harmonic cancellation method based on SVPWM
  • Seven-phase induction machine harmonic cancellation method based on SVPWM

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Embodiment Construction

[0015] The technical method of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the described embodiments.

[0016] The basic idea of ​​SVPWM proposed by the present invention is to start from the viewpoint of multi-dimensional vector space modulation, find out the relationship between voltage vectors based on the load equivalent circuit, use the method of set to classify it, and select a representative voltage vector Collection implementing the PWM algorithm.

[0017] The switch state of the voltage-type inverter determines the structure of the load equivalent circuit. For a seven-phase voltage inverter, when the switch state is 1110000, the load equivalent circuit is 4 loads connected in parallel and then connected in series with the other three parallel loads.

[0018] Select three groups of voltage vectors, and take the first sector of the fundamental wave space as an example to project them into t...

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Abstract

The present invention provides a Seven-phase induction machine harmonic cancellation method based on the SVPWM. In a drive system of a multi-phase motor supplied with power by a voltage source and aninverter, the motor is little in impedance in the generalized zero sequence sub space, a traditional SVPWM is employed to cause a large stator harmonic current. The present invention provides a control method of low output harmonic wave and a low switching loss. According to the space decoupling idea, voltage vector is projected in the harmonic wave sub space to generate a resultant vector while in a fundamental wave sub space, 3 amplitudes and 6 vectors are combined to be the resultant vector, and the vector applying sequence and time are regulated, and three-times and five-times harmonic wave sub space resultant vector is 0 to achieve the effect on harmonic cancellation.

Description

technical field [0001] The invention relates to the control field of a seven-phase induction motor, in particular to a novel seven-phase motor harmonic elimination method using a SVPWM modulation algorithm. Background technique [0002] Compared with the traditional three-phase induction motor, the seven-phase induction motor has many outstanding advantages: it reduces the requirements on the capacity of power devices, it is easy to achieve lower than high-power speed regulation, and at the same time, due to the redundancy of the number of phases, the operation reliability is high. Two voltage vectors are used to synthesize SVPWM, the purpose of which is to reduce switching times and thus reduce switching losses. However, the application of traditional three-phase SVPWM does not consider the influence of voltage vectors in the generalized zero-sequence subspace. This patent proposes a modulation using SVPWM Method According to the idea of ​​space decoupling, while the voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P21/05H02P27/12
CPCH02P21/22H02P21/05H02P27/12
Inventor 杨飏
Owner NANJING INST OF RAILWAY TECH
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