Conditions of Existence and Uniqueness of Limit Cycle for Grid-Connected VSC With PLL

Li, Yujun; Lu, Yiyuan; Tang, Yingyi; Zhang, Du

doi:10.1109/tpwrs.2023.3238000

Cited by 1 publication

(2 citation statements)

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“…In practical engineering, the output of the proportionalintegral (PI) controller is limited within a certain range to avoid overcurrent damaging the converter. With consideration of the current limiter, the reference d-axis current of the converter is written as (2).…”

Section: Control Mode Switching Of Cig Under Grid Faultmentioning

confidence: 99%

“…In view of the fossil crisis and environmental protection needs, CIG has become prevailing in nowadays power systems [1] in the form of photovoltaic (PV), wind etc. Unlike traditional synchronous generators (SGs), the fault characteristics of CIG are mainly determined by the properties of its controller [2]. In addition, dependent on the fault severity, the grid-connected voltage source converter (VSC) may switch into different control modes, such as the current limiting mode to prevent overcurrent damaging the vulnerable converter [3], or low voltage ride through (LVRT) mode to provide reactive power support to the AC system [4].…”

Section: Introductionmentioning

confidence: 99%

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Fault analysis of converter interfaced generator embedded power system considering control mode switching

Zhang

et al. 2023

IET Generation Trans & Dist

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Converter interfaced generation (CIG) may switch into different control modes under different fault scenarios, which poses a significant challenge to the fault calculation of modern power systems. This paper first establishes a reduced fault analysis model of CIG considering control mode switching. By neglecting the fast dynamic processes of the converter controller, CIG with each control mode can be expressed by equality and inequality constraints. Then, an alternative iteration algorithm is proposed to determine the control mode of each grid-tied converter after fault, which mainly contains the estimation and discrimination steps. In the estimation step, the voltage of the point of common coupling (PCC) and output current of CIG are obtained by simultaneously solving the equality constraints of CIG and the reduced network equation. In the discrimination step, the inequality constraints of CIG are utilized to judge and revise the control mode of each converter. With alternative execution of the estimation and discrimination steps, the fault network can be solved. Simulation studies based on PSCAD/EMTP validate that the proposed method has high accuracy in fault calculation of the CIG embedded system under various fault locations and fault resistances.

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Section: Control Mode Switching Of Cig Under Grid Faultmentioning

confidence: 99%