The igbtbased siemens hvdc plus is build out of selfcommutated systems with indirect voltage link voltagesourced converters, vsc and operates with the newest type of the modular multilevelconverter mmc, which is used in the ultranet project, and has a transmission capacity up to 2000 mw at a. Small power tapping limit on dclink of vsc hvdc transmission. But the control system is implemented through the computer discrete sampling in practical engineering. The significance of the research work in this field is obvious, however, advances in the area are detracted because of the lack of available vschvdc system models. Wps41050 ana irina stan daniel ioan stroe synopsis. Voltage source convertesvsc, hvdc, parameter optimization. Because vsc hvdc is a kind of strong nonlinear, coupling, and multiinput multioutput mimo system, its control problem is always attracting much attention from scholars. A recently invented control strategy, known as powersynchronization control, is applied for the integration of the wind farm to the hvdc grid. Model predictive control of voltage source converter in a. Understanding the design and control of vscbased hvdc.
Voltage source converter based high voltage direct current vschvdc long distance power transmission lines are needed to incorporate renewable energy sources to the grid. I want to design a hvdc system using voltage source converter vsc. Hvac 3phase lower transmission loss because of no reactive loss lower insulationclearance of conductor dc voltage is about 71% of the ac peak voltage. Hvdc is used as an alternative to ac for transmitting electrical energy over long distances or between ac power systems of different frequencies. This paper presents a simplified modeling approach for a voltage source converter based high voltage dc transmission line vschvdc for use in power system dynamic studies. Vscbased hvdc transmission system detailed model simulink. In the last decade, after the design and control of the mmc was proposed 11. Inductive filtering converter in hvdc light systems. Modeling, analysis and control of voltagesource converter.
In this thesis, the modeling and control issues for vschvdc links connected to weak ac systems are investigated. Further easy to comprehend analytical model in universally available software like matlabsimulink can help in fast spread of complex hvdc system knowledge also to those who are responsible for operation and maintenance of these systems thus bringing large benefits. Hvdclight transmission is established in matlabsimulink. Control of vscbased hvdc transmission system for offshore.
Abstract several large offshore wind power plants wpp are planned in the seas around europe. Coordination of multiplepower tapping from existing hvdc link. High voltage direct current hvdc systems enable utilities to move more power further, interconnect grids, integrate renewables, and improve network performance. Vscbased hvdc transmission system detailed model matlab. Fast frequency support control in the gb power system. High voltage direct current hvdc systems grid solutions.
Hvdc converters capable of converting up to two gigawatts gw. Fuzzy logic controller based on voltage source converterhvdc. In matlab demos a hvdc system is explained for 230 kv, 50 hz 200 mva in which 100 kv is the dc output from the rectifier station. The effectiveness of the proposed technique is applied to a case study, demonstrated in matlabsimulink program and simulation results presented. Modelling, control design and analysis of vsc based hvdc. A description of the control system is provided in the vscbased hvdc link case study of the users manual. Matlabsimulink system identification toolbox and a transfer function. Since the first successful application of vsc hvdc in 1997 in gotland, sweden. Control of vscbased hvdc transmission system for o shore wind power plants semester. This example shows the steadystate and transient performance of a simple 500 mw 250 kv2ka hvdc transmission system. A mpc controller is modeled based on the statespace model of a single vschvdc station including the dynamics of the main ac grid. Pdf matlabsimulink model for hvdc fault calculations. Proceedings of the 19th world congress the international federation of automatic control cape town, south africa. Mar 23, 2017 all vsc systems are capable of operating as either rectifier or inverter.
The simulink model will be considered as a reference for the. Modeling and control of vschvdc links connected to weak. Control of vsc based hvdc transmission system for o shore wind power plants semester. Modeling, analysis and control of voltagesource converter in microgrids and hvdc by ling xu a dissertation submitted in partial ful llment of the requirements for the degree of doctor of philosophy department of electrical engineering college of engineering university of south florida major professor. Dynamic model of the system is developed in the simulink environment. Modeling, analysis and control of voltagesource converter in. Vschvdc system modeling and validation robert rogersten masters degree project stockholm, sweden 2014 xreeeps 2014. Therefore, comparisons to the simulink model are performed in. Hvdc transmission and reactive power compensation with voltage source converter vsc technology has certain attributes which can be beneficial to overall system performance. Simulink introduction control systems focus and pid duration. Hvdc is an established technology that has been in. Modelling, control and simulation of lcchvdc systems for stability studies preface due to the penetration of renewable energy systems and power electronics in high voltage hv grids, particularly high voltage direc current hvdcfocused power electronics, tsos are increasingly worried about stability issues. The appearance of vsc hvdc, having a smaller converter size, reduced filters, dynamic reactive power support and fast power reversal, has facilitated the implementation of hvdc technology in a wider range of applications 9. An hvdc converter converts electric power from high voltage alternating current ac to high voltage direct current hvdc, or vice versa.
Development, calibration and simulation of generic vschvdc. Vschvdc is a suitable means of integrating such large and distant offshore wpp which need long submarine cable transmission to the onshore grid. Mar 11, 2015 summary of power losses incurred by the various models model active power lossesmw reactive power losses mvar ac1 ac2 vsc hvdc ac1 ac2 vsc hvdc pv buses 2641 1. And a lot of papers have done research on its control strategy in the continuoustime domain. Inductive filtering converter in hvdc light systems 1nidhi mishra, 2prerna jain. Because vschvdc is a kind of strong nonlinear, coupling, and multiinput multioutput mimo system, its control problem is always attracting much attention from scholars. Hvdc transmission system converter can be obtained by analytical modelling. Control of mmc in hvdc applications aalborg universitet. The enclosed cdrom contains the thesis report written in latex, adobe pdf formats, source codes, documents used throughout the thesis and. The analysis of vsc based hvdc is carried using both dq model negkting. In video, it can be seen that power at vsc 3 goes to 0.
Load this model and save it in your working directory as case5 to allow further modifications to the original system. Modelling and simulation of vschvdc connection for. Fast frequency support control in the gb power system using. I want to design a hvdc system using voltage source convertervsc. Modelling of multiterminal vschvdc links for power flows and. Modeling of multiterminal vscbased hvdc systems by mohammed mabrook alharbi a thesis presented to the graduate faculty of the missouri university of science and technology in partial fulfillment of the requirements for the degree master of science in electrical engineering 2014 approved by dr. Remus teodorescu pedro rodriguez rodrigo da silva project group. Doktorsavhandlingar vid chalmers tekniska hogskola. Modelling, control and simulation of lcchvdc systems for stability studies preface due to the penetration of renewable energy systems and power electronics in high voltage hv grids, particularly high voltage direc current hvdcfocused power electronics, tsos are. August 2429, 2014 simplified modeling of vschvdc in power system stability studies f. Summary of power losses incurred by the various models model active power lossesmw reactive power losses mvar ac1 ac2 vschvdc ac1 ac2 vschvdc pv buses 2641 1.
This paper investigates the dynamic performance of a 200mw,100kv vsc hvdc transmission system under some faulted conditionsusing matlab simulink. Modeling and control of vschvdc links connected to weak ac. How to obtain the dc output of 2000 kv by changing the input value of ac system. Vsc hvdc without dc voltage droop control thesis part1. Description a 500 mw 250 kv, 2 ka dc interconnection is used to transmit power from a 315 kv, 5000 mva ac network.
Abstract the voltage source converter vsc based hvdc system is a relatively new technology for low and medium. Abb has participated in the delivery of more than half of the worlds around 170 hvdc links. Simulation of hvdc system in simulink and fault analysis. Erlich university duisburgessen, 47057 duisburg, germany.
In the present work all the equivalent models are implemented in the matlabsimulink software in order to. Hvdc link with statcom static compensator, when connected to a weak ac system which has the stability enhancement for power instability and commutation failures. Nov 12, 2016 simulink introduction control systems focus and pid duration. Modeling of multiterminal vsc based hvdc systems by mohammed mabrook alharbi a thesis presented to the graduate faculty of the missouri university of science and technology in partial fulfillment of the requirements for the degree master of science in electrical engineering 2014 approved by dr. Introduction connecting the dispersed nature of loads in africa and. Abb and hvdc the worlds first commercial high voltage direct current hvdc link, situated between the swedish mainland and the island gotland, was delivered by abb already in the 1950s. Pdf modeling and simulation of vschvdc with dynamic phasors. An overview article pdf available in ieee transactions on power electronics 243. Development, calibration and simulation of generic vsc. Jul 10, 2015 this comprehensive reference guides the reader through all hvdc technologies, including lcc line commutated converter, 2level vsc and vsc hvdc based on modular multilevel converters mmc for an indepth understanding of converters, system level design, operating principles and modeling. The main objective of this research endeavor is to evaluate the implementation of a hvdc transmission system for integrating offshore wind energy with the grid. Hvdc converters capable of converting up to two gigawatts gw and with voltage ratings of up to 1,100.
Pdf a novel dynamic phasors method to model voltage sources converter based hvdc vschvdc transmission system is proposed in this. All vsc systems are capable of operating as either rectifier or inverter. You can run the command by entering the following in the matlab command window. In order to fully utilize the potential of the vschvdc system for weakacsystem connections, a novel control method, i. A full scale nonlinear switching model of pointtopoint connected vscbased hvdc system is developed in matlabsimulink asso. The simulink model will be considered as a reference for the generic control model. Abb writes the next chapter in pioneering hvdc technology duration. This comprehensive reference guides the reader through all hvdc technologies, including lcc line commutated converter, 2level vsc and vsc hvdc based on modular multilevel converters mmc for an indepth understanding of converters, system. The igbtbased siemens hvdc plus is build out of selfcommutated systems with indirect voltage link voltagesourced converters, vsc and operates with the newest type of the modular multilevelconverter mmc, which is used in the ultranet project, and has a transmission capacity up to 2000 mw at a voltage of 500 kv dc. A detail description of the operating scheme of a 12pulse voltage source converter vsc used in high voltage dc hvdc system is presented here. Dynamic modelling and implementation of vschvdc system.
Further easy to comprehend analytical model in universally available software like matlab simulink can help in fast spread of complex hvdc system knowledge also to those who are responsible for operation and maintenance of these systems thus bringing large benefits. This paper presents a simplified modeling approach for a. Simplified modeling of vschvdc in power system stability. Pscad and simulink are graphical tools that can be used for simulation. Transmission thyristor and diode discs for vsc, hvdc and uhvdc infineon provides a wide range of thyristor and diode discs up to 9. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Hvdc systems utilize power electronics technology to convert ac and dc voltage, and are ideal for supporting existing systems or building new power highways. In this paper, the proposed shunt controller is based on the voltage source converter topology as it is conventionally realized by. In the ac grid sendingend and receivingend converters sec and rec of the hvdc system are represented by controlled thevenin sources. This section describes the test system and the vschvdc control architecture. Hvdc and facts transmission technologies available today offer the planner increased flexibility in meeting transmission challenges. Understanding the design and control of vscbased hvdc system. Modelling and simulation of vschvdc connection for offshore. Modelling, control and simulation of lcc hvdc systems for.
504 1361 1416 567 1453 399 787 376 730 1125 1147 1156 1568 537 1086 1221 606 867 941 146 993 1332 1540 1558 1165 629 124 212 101 486 1529 1672 1321 989 1345 1654 777 705 437 813 1355 1164 737 1344 1256