scholarly journals SIMULATION OF VSC BASED HVDC TRANSMISSION SYSTEM FOR THE INTEGRATION OF WINDFARM INTO GRID

2013 ◽  
pp. 19-22
Author(s):  
MAHALAKSHMI. R ◽  
P. USHA
Keyword(s):  
Wind Farms ◽  
Voltage Source ◽  
Modern World ◽  
Voltage Source Converter ◽  
Simulation Studies ◽  
Transmission Systems ◽  
Hvdc System ◽  
Hvdc Transmission ◽  
Ac Transmission ◽  
And Control

Wind energy has huge potential to become major source of renewable energy for the modern world. For integrating wind farms to the AC grid, HVDC transmission systems have several advantages over AC transmission systems. This paper presents the design and control of voltage source converter based HVDC system for integration of wind farms in to AC grid. The designed VSC-HVDC system performance under steady state conditions and various transient conditions are presented. The PSCAD/EMTDC software package is used for the simulation studies.

scholarly journals A Selective Fault Clearing Scheme for a Hybrid VSC-LCC Multi-Terminal HVdc System

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3554
Author(s):  
Naushath M. Haleem ◽  
Athula D. Rajapakse ◽  
Aniruddha M. Gole ◽  
Ioni T. Fernando
Keyword(s):  
High Capacity ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Circuit Breakers ◽  
Hvdc System ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Clearing Functions ◽  
Transmission Structure ◽  
The Impact

A selective fault clearing scheme is proposed for a hybrid voltage source converter (VSC)-line commutated converter (LCC) multi-terminal high voltage direct current (HVdc) transmission structure in which two small capacity VSC stations tap into the main transmission line of a high capacity LCC-HVdc link. The use of dc circuit breakers (dc CBs) on the branches connecting to VSCs at the tapping points is explored to minimize the impact of tapping on the reliability of the main LCC link. This arrangement allows clearing of temporary faults on the main LCC line as usual by force retardation of the LCC rectifier. The faults on the branches connecting to VSC stations can be cleared by blocking insulated gate bipolar transistors (IGBTs) and opening ac circuit breakers (ac CB), without affecting the main line’s performance. A local voltage and current measurement based fault discrimination scheme is developed to identify the faulted sections and pole(s), and trigger appropriate fault recovery functions. This fault discrimination scheme is capable of detecting and discriminating short circuits and high resistances faults in any branch well before 2 ms. For the test grid considered, 6 kA, 2 ms dc CBs can easily facilitate the intended fault clearing functions and maintain the power transfer through healthy pole during single-pole faults.

Technology of Offshore Wind Turbines and Farms and Novel Multilevel Converter-Based HVDC Systems for Their Grid Connections

2002 ◽  
Vol 26 (6) ◽  
pp. 383-395 ◽  
Author(s):  
Vassilios G. Agelidis ◽  
Christos Mademlis
Keyword(s):  
Wind Turbines ◽  
Wind Farms ◽  
Offshore Wind ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Offshore Wind Farms ◽  
Offshore Wind Turbines ◽  
Hvdc System

The technology associated with offshore wind farms is discussed in detail. First, the various offshore wind turbines are reviewed and the factors influencing their characteristics are outlined in comparison with their onshore counterparts. This overview serves as a basis for the discussion that follows regarding the possible electrical connection within the farm, and between the farm and the grid. Voltage-source converter-based HV DC connection is compared with HVAC connection. Finally, a novel multilevel converter-based HVDC system, based on flying capacitor multilevel converters is proposed, as a possible interface between the farm and the grid.

Novel Configuration of 60-Pulse Voltage Source Converter for STATCOM Application

2007 ◽  
Vol 8 (5) ◽  
Author(s):  
Wulue Pan ◽  
Zheng Xu ◽  
Jing Zhang
Keyword(s):  
Computer Simulation ◽  
Control Strategies ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Dc Voltage ◽  
Current Harmonic ◽  
Hvdc System ◽  
And Control ◽  
Injection Ratio ◽  
Auxiliary Circuit

The proposed voltage source converter is composed of a series double bridge converter with an auxiliary circuit. The auxiliary circuit injects DC voltage via the mid point of the double bridge converter. The injection ratio and frequency are chosen to convert the standard 12-pulse into 60-pulse configuration without PWM or increasing the number of bridges, thus the voltage and current harmonic can fulfill the THD limit without a conventional filter. The converter is operated under fundamental frequency for the main bridges, thus its switching lose is low. The converter can be widely used in the STATCOM and HVDC system. The paper describes the principles and control strategies of the proposed converter. The operational feasibility of the proposed converter is verified by computer simulation using the PSCAD/EMTDC package.

scholarly journals A Review on Topology, Operating and Control Methods of HVDC Transmission System for Offshore Wind Farms

2020 ◽  
Vol 165 ◽  
pp. 06012
Author(s):  
Jinke Li ◽  
Jingyuan Yin ◽  
Yonggao Guan ◽  
Zhenquan Wang ◽  
Tao Niu ◽  
...  
Keyword(s):  
Power Transmission ◽  
Wind Farms ◽  
Transmission System ◽  
Power Sharing ◽  
Offshore Wind ◽  
Control Methods ◽  
Transmission Systems ◽  
Offshore Wind Farms ◽  
Hvdc Transmission ◽  
And Control

High-voltage direct current (HVDC) transmission systems are a promising solution for long distances power transmission offshore wind farms. In order to satisfy the reliability requirements of receiving-end grid and system, the topology, operation and control of HVDC transmission systems for offshore wind farms should be paid more attention. Thus, the aim of this manuscript is to offer a comprehensive summary of existing topology, operation and control methods applied to HVDC transmission system for offshore wind farms. Special attention is provided to the ac grid fault through control methods, droop control methods, power sharing rules and specific requirements of HVDC system planning, model, design and investment. The results are important for understanding the operation of VSC-HVDC in offshore wind farms.

scholarly journals Design and Transient Studies on Multi-Terminal VSC-HVDC Systems Interconnecting Offshore Wind Farms

2019 ◽  
Vol 17 (2) ◽  
pp. 181-192
Author(s):  
M. Mohan ◽  
K. Panduranga Vittal
Keyword(s):  
Large Scale ◽  
Wind Farms ◽  
Transmission System ◽  
Offshore Wind ◽  
Voltage Source ◽  
Transmission Systems ◽  
Offshore Wind Farms ◽  
Continuous Increase ◽  
Modeling And Control ◽  
Hvdc Transmission

In recent years, offshore wind energy has increased significantly. The continuous increase in the offshore wind power generation level brings the requirement of the offshore wind farms (OWFs) integration with an AC grid. The multi-terminal (MT) voltage source converters (VSC)-based high voltage direct current (HVDC) transmission system is an emerging technology and also the best option to interconnect the large-scale OWFs to the AC grid. This paper presents the design, modeling, and control of MT VSC-HVDC transmission system linked offshore wind farms. Different cases of MT VSC-HVDC transmission systems are developed, and its simulation studies are carried out using PSCAD/EMTDC. The test results show the transient performance of the MT VSC-HVDC transmission systems under various AC and DC fault conditions. The studies also include the influence of wind variabilities as in the form of gust and ramp pattern during steady state and fault conditions.

scholarly journals Sub-/Super-SCI Influencing Factors Analysis of VSC-HVDC and PMSG-Wind Farm System by Impedance Bode Criterion

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1865
Author(s):  
Yibo Zhang ◽  
Xu Tian ◽  
Cong Wang ◽  
Hong Cheng
Keyword(s):  
Influencing Factors ◽  
Transmission Lines ◽  
Wind Farm ◽  
Wind Farms ◽  
Synchronous Generator ◽  
Current Control ◽  
System Stability ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Ac Transmission

A sub-/super-synchronous interaction (sub-/super-SCI) can occur between a voltage source converter-based high-voltage direct current (VSC-HVDC) and the permanent magnet synchronous generator (PMSG)-based wind farms with long AC transmission lines. However, the influencing factors have not been properly analyzed. In this paper, these are deconstructed and mathematically analyzed from detailed small-signal impedance equations in the dq-frame and the corresponding Bode stability criterion. Distinguishing conclusions from existing papers are obtained by studying the controllers’ bandwidths instead of their coefficients. The impacts of AC line impedance on system stability are also investigated. From the analysis of their compositions in impedance structure, the VSC-HVDC bandwidths and the wind farm phase-locked loop (PLL) bandwidth and power ratio, and the AC line impedance have various influences on the system stability. Meanwhile, the wind farm outer DC voltage and inner current control bandwidths have little impact on system stability. The results of these studies show that the magnitude in the axes q-axes impedance interaction is the essential factor for system instability. Our studies also show system stability is more sensitive to the HVDC bandwidths than the wind converter PLL bandwidth. The simulation results verify our theory conclusions.

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