Impact of synchronous condenser on the dynamic behavior of LCC based UHVDC system hierarchically connected to AC system

Ali, Aamir; Qiao, Li; Guo, Chunyi; Rehman, Atiq Ur; Yang, Zhizhong

doi:10.17775/cseejpes.2018.00420

Cited by 35 publications

(15 citation statements)

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“…However, the start-up control of large-capacity SC with VSC-based SFC was not discussed under the different criterions of grid integration constraint. The use of a SC to mitigate CF in HC-UHVDC system was analyzed in [17]. Analysis of the transient performance of HC-UHVDC for single-phase and three-phase to ground faults was investigated.…”

Section: Lccmentioning

confidence: 99%

Start-Up Control and Grid Integration Characteristics of 300 MVar Synchronous Condenser With Voltage Sourced Converter-Based SFC

et al. 2019

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Synchronous condenser (SC) is generally used as the devices for reactive power support for the ultra-high-voltage direct current (UHVDC) transmission at the receiving end. When a SC is started, it will have a large surge on the interconnected system and the SC itself. In severe cases, it will endanger the operation of SC and related equipment. The start-up control of a 300 MVar SC using voltage source converter (VSC)-based static frequency converter (SFC) is proposed in this paper. Dynamic behaviors of interconnected system during the start-up period with three different criterions of grid integration constraint of the SC, including initial falling speed, frequency difference and phase difference, are analyzed. Firstly, topological structure and control strategy of the VSC-based SFC are proposed. Secondly, a mathematical model of the SFC-based SC is established. The surge of the start-up and grid integration of the SC with three different constraint criterions on the interconnected system is analyzed in sequence. Thirdly, a simulation system of a 300 MVar SC with VSC-based SFC is established in the time-domain simulation software PSCAD/EMTDC TM. Dynamic behaviors and surge of the overall system with different criterions of grid integration constraint are demonstrated and studied. Finally, a comprehensive starting control strategy of the SC with optimized initial falling speed, optimized frequency difference and optimized phase difference is proposed based on the theoretical analysis and simulation experiments. Simulation results justify the effectiveness of the start-up and grid integration control strategy proposed. INDEX TERMS Synchronous condenser, voltage source converter (VSC)-based static frequency converter (SFC), start-up and grid integration control, constraint criterions, dynamic behaviors. NOMENCLATURE SFC Static frequency converter SC Synchronous condenser VSC Voltage source converter CSC Current source converter UHVDC Ultra-high-voltage direct current HC Hierarchical connection SVC Static var compensator The associate editor coordinating the review of this manuscript and approving it for publication was Enamul Haque.

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Section: Lccmentioning

confidence: 99%

Start-Up Control and Grid Integration Characteristics of 300 MVar Synchronous Condenser With Voltage Sourced Converter-Based SFC

et al. 2019

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“…When the inverter of the converter station undergoes commutation failure, the synchronous condenser excitation current increases in a short time. Owing to the recovery ability of the system itself, the excitation current gradually reverts to the original state [25,26]; the maximum excitation current can reach approximately 1.7 times the rated operation. Excitation F I G U R E 9 Unbalanced magnetic pull force of different short circuit turns before and after commutation failure state F I G U R E 8 Three-dimensional model of the rotor of the synchronous condenser current rises sharply owing to the commutation failure; further, the unbalanced magnetic force between the stator and the rotor of the synchronous condenser also increases.…”

Section: Argumentation Of the Rationality Of Stator Vibration Amplitudementioning

confidence: 99%

Fault diagnosis method based on multi‐source information fusion for weak interturn short circuit in synchronous condensers

et al. 2021

IET Electric Power Appl

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The interturn short circuit fault in rotor windings is a common fault in a synchronous condenser. Aiming at the early faults that are difficult to detect, the theory of multi-source information fusion is applied herein for the identification of short circuit faults in the rotor windings of a synchronous condenser. Firstly, a field-circuit-network coupling model of a synchronous condenser for high-voltage direct current (HVDC) transmission was constructed using SIMULINK/ANSYS. The air gap magnetic flux density of the interturn short circuit regulator with a rotor winding was obtained, via co-simulation, before and after the commutation failure in the HVDC inverter. Further, threedimensional models of the stator and rotor of the synchronous condenser were established using ANSYS/Workbench; the stator and rotor vibration responses of the synchronous condenser were monitored before and after the system commutation failure. Secondly, three types of evidence bodies were obtained based on the Dempster-Shafer evidence theory. The results show that the confidence level of the evidence body of each faulted component of the synchronous condenser increases, and the accuracy of fault recognition also increases upon system commutation failure. Finally, a three-pairpole synchronous motor (MJF-30-6) was used to simulate the rated and overexcited operations of the synchronous condenser for experimental verification of the feasibility of the proposed method. This method provides a reference for the identification of weak interturn short circuit faults in synchronous condensers.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…e AC filters and reactive power compensation devices are also connected to 500 kV and 1000 kV AC buses [49,50].…”

Section: Uhvdc Hierarchical Connection Modementioning

confidence: 99%

Research on Transient Overvoltage Suppression Measures for Photovoltaics Connected to the DC Sending End in the Smart Power System for Industry 4.0

Niu

Shen

et al. 2020

Mathematical Problems in Engineering

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The development of smart power systems in Industry 4.0 will bring people better quality electrical energy. The photovoltaic power generation system in the smart grid for Industry 4.0 is also the focus of development. The rapid development of photovoltaic power generation systems will bring people cleaner and greener energy. However, it will cause the transient overvoltage phenomenon near the DC sending terminal when the large-scale photovoltaic plant is connected to the power grid, further bringing about a profound impact on the power grid and its security and stability. In this paper, it is proposed that the rise of transient overvoltage at the photovoltaic terminal is caused by three main factors including the reactive power surplus of DC commutation failure, the weak power grid at the sending terminal, and the control characteristics of the photovoltaic plant. Then, the coordinated control strategy of transient overvoltage is proposed, and the overvoltage control strategy of the DC transmission terminal and the photovoltaic power plant control strategy are, respectively, optimized. Finally, the influence parameters of overvoltage are analysed and the corresponding photovoltaic strategy is presented. The optimization results of photovoltaic parameters and the proposed strategies of photovoltaic power generation can effectively restrain the voltage or frequency fluctuation and power oscillation caused by HVDC commutation failure. This study promotes the development of the photovoltaic power generation system in the intelligent power system of industry 4.0.

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Impact of synchronous condenser on the dynamic behavior of LCC based UHVDC system hierarchically connected to AC system

Cited by 35 publications

References 0 publications

Start-Up Control and Grid Integration Characteristics of 300 MVar Synchronous Condenser With Voltage Sourced Converter-Based SFC

Start-Up Control and Grid Integration Characteristics of 300 MVar Synchronous Condenser With Voltage Sourced Converter-Based SFC

Fault diagnosis method based on multi‐source information fusion for weak interturn short circuit in synchronous condensers

Research on Transient Overvoltage Suppression Measures for Photovoltaics Connected to the DC Sending End in the Smart Power System for Industry 4.0

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