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Sensorless robust control for PMSG wind energy conversion systems based on smith predictor ADRC and SMO-PLL estimation 基于smith预测器自抗扰控制器和smoo - pll估计的PMSG风能转换系统无传感器鲁棒控制

COMPEL

Pub Date : 2023-11-16 DOI: 10.1108/compel-10-2022-0353

Abdeldjabar Benrabah, Farid Khoucha, Ali Raza, Mohamed Benbouzid

Purpose

The purpose of this study is to improve the control performance of wind energy conversion systems (WECSs) by proposing a new sensorless, robust control strategy based on a Smith predictor active disturbance rejection control (SP-ADRC) associated with a speed/position estimator.

Design/methodology/approach

The estimator consists of a sliding mode observer (SMO) in combination with a phase-locked loop (PLL) to estimate the permanent magnet synchronous generator (PMSG) rotor position and speed. At the same time, the SP-ADRC is applied to the speed control loop of the variable-speed WECS control system to adapt strongly to dynamic characteristics under parameter uncertainties and disturbances.

Findings

Numerical simulations are conducted to evaluate the speed tracking performances under various wind speed profiles. The results show that the proposed sensorless speed control improves the accuracy of rotor speed and position estimation and provides better power tracking performance than a regular ADRC controller under fast wind speed variations.

Practical implications

This paper offers a new approach for designing sensorless, robust control for PMSG-based WECSs.

Originality/value

A new sensorless, robust control is proposed to improve the stability and tracking performance of PMSG-based WECSs. The SP-ADRC control attenuates the effects of parameter uncertainties and disturbances and eliminates the time-delay impact. The sensorless control design based on SMO and PLL improves the accuracy of rotor speed estimation and reduces the chattering problem of traditional SMO. The obtained results support the theoretical findings.

本研究的目的是通过提出一种新的无传感器、鲁棒控制策略，基于Smith预测器自抗扰控制(SP-ADRC)和速度/位置估计器，来提高风能转换系统(wecs)的控制性能。该估计器由滑模观测器(SMO)和锁相环(PLL)组成，用于估计永磁同步发电机(PMSG)转子的位置和速度。同时，将sp -自抗扰控制器应用于wcs变速控制系统的速度控制回路中，使其对参数不确定和干扰下的动态特性具有较强的适应能力。通过数值模拟对不同风速剖面下的速度跟踪性能进行了评价。结果表明，在快速风速变化情况下，与常规自抗扰控制器相比，所提出的无传感器转速控制提高了转子转速和位置估计的精度，并具有更好的功率跟踪性能。本文提供了一种设计无传感器、鲁棒控制的新方法。提出了一种新的无传感器鲁棒控制方法，以提高基于pmmsg的wcs的稳定性和跟踪性能。SP-ADRC控制可以减小参数不确定性和干扰的影响，消除时延影响。基于SMO和锁相环的无传感器控制设计提高了转子转速估计的精度，减少了传统SMO的抖振问题。所得结果支持了理论研究结果。

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引用次数: 0

Improving the accuracy for amplitude and frequency of analytical equation of single-ended ring oscillators based on circuit and transistor parameters 提高了基于电路和晶体管参数的单端环形振荡器振幅和频率解析方程的精度

COMPEL

Pub Date : 2023-07-12 DOI: 10.1108/compel-02-2023-0072

Mehrdad Moradnezhad, Hossein Miar Naimi

Purpose

This paper aims to find a closed-form expression for the frequency and amplitude of single-ended ring oscillators when transistors experience all regions.

Design/methodology/approach

In this paper, the analytical relationships presented for ring oscillator amplitude and frequency are approximately derived due to the nonlinear nature of this oscillator, taking into account the differential equation that governs the ring oscillator and its output waveform.

Findings

In the case where the transistors experience the cut-off region, the relationships presented so far have no connection between the frequency and the dimensions of the transistor, which is not valid in practice. The relationship is presented for the frequency, including the dimensions of the transistor. Also, a simple and approximately accurate relationship for the oscillator amplitude is provided in this case.

Originality/value

The validity of these relationships has been investigated by analyzing and simulating a single-ended oscillator in 0.18 µm technology.

目的寻找晶体管经历所有区域时单端环振子频率和幅值的封闭表达式。设计/方法/方法在本文中，考虑到控制环形振荡器及其输出波形的微分方程，由于环形振荡器的非线性性质，给出了环形振荡器振幅和频率的解析关系。在晶体管经历截止区域的情况下，到目前为止给出的关系在晶体管的频率和尺寸之间没有联系，这在实践中是无效的。给出了频率的关系，包括晶体管的尺寸。此外，在这种情况下，振荡器振幅提供了一个简单而近似准确的关系。通过分析和模拟0.18 μ m技术的单端振荡器，研究了这些关系的有效性。

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引用次数: 0

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