کنفرانس بین المللی ماشین و محرکه های الکتریکی

صفحه اصلی / The 5th International Conference on Electrical Machines and Drives

On the effect of control parameter variations and PLL dynamics on low-order harmonics in single phase grid-connected inverters in the presence of grid impedance uncertainty

نویسندگان :

Seyed mohammad ebrahim Mirjebreili¹ Sadegh Mohsenzade²

1- Department of Electrical Engineering K. N. Toosi University of Technology 2- Department of Electrical Engineering K. N. Toosi University of Technology

کلمات کلیدی :

Grid-connected inverter،Phase-locked loop (PLL)،Output impedance،Stability analysis،Total harmonic distortion (THD)،Renewable energy

چکیده :

This research models and analyzes the stability of a single-phase grid-connected inverter, focusing on its dynamic behavior at frequencies higher than the fundamental 50 Hz grid frequency. In practical applications, fluctuations and uncertainty in the grid impedance may cause inverter instability and result in the generation of low-order harmonics in the output current, particularly the 3rd, 5th, 7th, and higher orders. To address this issue, the inverter is modeled in the extended frequency domain, and its output impedance is derived and analyzed. Using the Nyquist stability criterion, the dependence of output current stability on inverter and grid impedance interactions is investigated. The study further examines how tuning the PI parameters in both the current control loop and the phase-locked loop (PLL) can enhance inverter stability and suppress low-order harmonics. Simulation results confirm that proper PI and PLL adjustment not only guarantees stable operation but also effectively eliminates the dominant low-order harmonics, thus decreasing the total harmonic distortion (THD) present in the inverter’s output current.

لیست مقالات

لیست مقالات بایگانی شده

A Two-stage Isolated Bidirectional AC-DC-DC Converter with Soft ‎Switching Operation

Reza Takarli - Younes Hosseini Ashtiani - Amirhossein Khanahmadi - Mohamadmahdi ُShahbazi - Ebrahim Afjei

تحلیل عیب ناهم محوری از نوع ترکیبی در ماشین شارمحوری آهنربای دائم بدون هسته

فاطمه اسلامی - مصطفی شاه نظری

Data-Driven Prediction of Average Torque, Phase Resistance, and Coil Turns in 6/4 Switched Reluctance Motors Using ANN and EMDLAB

Nasrin Majlesi - Ali Jamali-Frad - Tohid Sharifi

A Novel Structure of Shaped-Magnet Synchrounos Machines Based on Halbach Array in Radial and Axial Axes

Soheil Yousefnejad - Davood Kheibargir

Performance Evaluation of PMSM and BLDC Motors in Different Operating Scenarios Based Slide Mode Control

Ali Abdul Razzaq Altahir - Mohammed Albaker Abed - Abduljabbar Hanfesh - Ahmed Abdulhadi Ahmed

An Active Current Balancing Method for Multiphase LLC Resonant Converter

Seyedamirhossein Talebi - Kioumars Shahriari - Salar Sadeghian - Reza Takarli - Seyed Fariborz Zarei

Performance Analysis of the Outer Rotor Variable Reluctance Resolver

MohammadReza Soleimani - Saeed Hajmohammadi - Zahra Nasiri-Gheidari - Dana Hemati - Hashem Oraee

Comparative Accuracy of IEC Ratio Approaches and Duval Triangle/Pentagon in Transformer Fault Diagnosis from DGA Data

Fateme Aliyari - Mohammad Hamed Samimi - Majid Sanaye-Pasand

Finite Element Analysis of a New High Torque Density Inter-Modular Permanent Magnet Motor with Flux Barriers in the Stator

Mohammad Afrank - Mohammad Amirkhani - Ehsan Farmahini Farahani - Mojtaba Mirsalim

Pre-Impregnation High Voltage Testing of Random-Wound Stators for Early Detection of Insulation Defects

Ali Alaeddini - Fatemeh Ramezani - Mahdi Khademnahvi - Mansour Torabi

بیشتر