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Systems and methods for harmonic compensation

A technology of harmonics and correction algorithm, applied in the field of harmonic systems, it can solve the problems of easily exceeding the loop bandwidth, controllability of control algorithms, and inability to provide sufficient performance.

Inactive Publication Date: 2019-09-27
KSR IP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these harmonics tend to exceed the loop bandwidth, this creates controllability issues for the control algorithm
Due to the inherent bandwidth limitations of PI control, simple PI controller tuning will not provide adequate performance over the entire operating speed range of the machine

Method used

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  • Systems and methods for harmonic compensation
  • Systems and methods for harmonic compensation
  • Systems and methods for harmonic compensation

Examples

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Embodiment Construction

[0018] figure 1 A system for detecting and canceling harmonic effects of non-sinusoidal back electromotive force (BEMF) voltages in the DQ plane is generally described. The system is a field-oriented controller (FOC), which includes a multiphase motor, a proportional-integral-derivative controller, and a microcontroller. The microcontroller not only analyzes the rotor flux position, but also the BEMF voltage to extract the flux vector of the EMF. These vectors are distorted due to the geometry and saturation effects inherent in synchronous polyphase motors. Since the BEMF voltage is extracted and the rotor flux orientation is known, the correction algorithm within the microcontroller corrects these deficiencies by transferring the BEMF vector and the machine operating point (including the current speed and current) into the algorithm, which in turn is in the DQ coordinate system for this Specific operating points generate command voltages. This command voltage is inserted ...

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Abstract

A system for detecting and eliminating harmonic effects in the DQ plane of the non- sinusoidal back EMF voltages is provided. The system is a field oriented controller (FOC) that includes a poly-phase electric machine, proportional-integral-derivative controllers and a microcontroller. The microcontroller not only analyzes a stator current but analyzes a back electromotive force (BEMF) voltages to extract flux vectors of the EMF. These vectors have distortions as a result of the geometries and saturation effects inherent in the electrical machine. Therefore, the microcontroller corrects these defects by transmitting the BEMF vectors and the machine operating points, including the current rotational speed and current, into the algorithm, which in turn develops a command voltage in the DQ frame for the specific operating point. This command voltage is inserted into the control output of the current PI controller so to prevent the non-sinusoidal back EMF voltages from generating non-sinusoidal currents.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application Serial No. 62 / 458,751 filed February 14, 2017 under 35 CFR 119(e). technical field [0003] The present invention relates generally to systems with harmonic compensation, and more particularly to systems that analyze back EMF to correct harmonics in polyphase electric machines. Background technique [0004] Automotive alternators have traditionally been limited to use as pure generators, where a voltage regulator modulates a small field current to produce a constant direct current (DC) output voltage. Today, these machines are used as electric motors, providing torque for tasks such as driver assistance or engine starting, in addition to their regular power-generating functions. Voltage regulation, along with other motor functions, is now the function of an inverter system called an electronic control unit (ECU). To achieve these additional capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/06H02P29/50
CPCH02P21/06H02P29/50H02P21/0003H02P21/12H02P21/08
Inventor 埃里克·胡斯泰特帕西菲克·麦沙
Owner KSR IP HLDG