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Method for determining sensorless frequency doubling rotating speed and phase of permanent magnet synchronous generator converter

A permanent magnet synchronization and determination method technology, which is applied in the direction of synchronous generator control, generator control, generator control parts, etc., can solve the problems of affecting real-time performance, fluctuation of calculation results, insufficient real-time performance, etc., and achieve good real-time performance , reduce the amount of calculation, and facilitate the effect of power calculation

Pending Publication Date: 2022-06-07
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the permanent magnet synchronous wind turbine system, when the generator speed is low, without a speed sensor, the generator speed can only be calculated by the back electromotive force, but this will cause the calculated generator speed to have a certain Time delay, not real-time
The phase of the generator can only be calculated by the phase difference, but the calculation result will fluctuate greatly
To reduce fluctuations, filtering is required, but filtering will also affect real-time performance

Method used

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  • Method for determining sensorless frequency doubling rotating speed and phase of permanent magnet synchronous generator converter
  • Method for determining sensorless frequency doubling rotating speed and phase of permanent magnet synchronous generator converter
  • Method for determining sensorless frequency doubling rotating speed and phase of permanent magnet synchronous generator converter

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Embodiment 1

[0053] The present embodiment discloses a permanent magnet synchronous generator converter without a sensor doubling speed and phase determination method, the method based on the absence of a speed sensor to achieve speed and phase determination, such as Figure 1 as shown, which includes the following steps:

[0054] Step A: Set the sampling period, which generally does not exceed 0.5ms, which is determined according to actual needs. After the sampling cycle is set, the three-phase voltage and three-phase current of the generator are collected according to the sampling cycle interval, and then the calibrated three-phase voltage and three-phase current are calculated through zero drift adaptive, and then the actual voltage of the generator in the two-phase stationary coordinate system in each sampling cycle is calculated according to the calibrated three-phase voltage and three-phase current.

[0055] Wherein, the calculation method of the actual voltage is: first of all, the three-...

Embodiment 2

[0095] The present embodiment of the method of Example 1 is verified, as follows:

[0096] If the generator is set to a rated speed of 8.4 Hz, a sampling period of 0.5ms, and a phase multiplier of 32 times, the verification method is as follows:

[0097] Step 1: Three-phase voltage sampling after zero-drift adaptive calibration of the three-phase voltage U 1 (t)、U 2 (t) and U 3 (t) is a mixture of sine and switching waves over time. Three-phase current sampling is zero-drift adaptively calibrated after current I 1 (t)、I 2 (t) and I 3 (t) is time-dependent sine-like wave data. The calibrated three-phase voltage and three-phase current pass through the three-phase to two-phase stationary (α, β) coordinate system to obtain instantaneous voltage vectors and is a mixture of sine wave and switching waveform data that changes over time, resulting in instantaneous current vector I α (t) and I β (t) is time-dependent sine-like wave data.

[0098] The three-phase to two-phase stationary (...

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Abstract

The invention discloses a method for determining the sensorless frequency multiplication rotating speed and phase of a permanent magnet synchronous generator converter. The method comprises the following steps: A, calculating the actual voltage of a generator under a two-phase static coordinate system in each sampling period; b, calculating the phase increment of the current sampling period; c, performing phase frequency multiplication on the phase increment to obtain a new phase waveform; d, in the new phase waveform, the frequency estimation value of the generator in the current sampling period is calculated according to the numerical value of the external pulse counter in the period from 0 to 1; and E, the actual frequency of the generator is calculated by the PID controller, and then the actual rotating speed and the actual phase in the current sampling period are calculated according to the actual frequency. By adopting the method, the rotating speed and the phase of the converter can be obtained more quickly and accurately, so that support is provided for accurate control of the converter.

Description

Technical field [0001] The present invention belongs to the field of control technology of permanent magnet synchronous wind turbine three-phase converter, specifically relates to a permanent magnet synchronous generator converter without sensing frequency doubling speed and phase determination method, the method is specific to the determination of speed and phase without speed sensor working conditions. Background [0002] A wind turbine is a device that converts wind energy into electrical energy and consists mainly of blades, generators, mechanical components, and electrical components. The principle of wind power generation is to use the wind to drive the windmill blades to rotate to promote the generator to generate electricity. Because wind power has no fuel problems and does not produce radiation or air pollution, wind power is forming a boom in the world. [0003] At present, the state has strict requirements for the performance indicators and power generation quality of ...

Claims

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Application Information

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IPC IPC(8): H02P9/02H02P101/15H02P103/20
CPCH02P9/02H02P2101/15H02P2103/20Y02E10/76
Inventor 孟新光何光俊李华银彭涛邵勤丰刘红王昌垒刘志林李豪傅炜娜辛旺
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD