Control of high voltage direct current links with overall large‐scale grid objectives

Arioua, Leyla; Marinescu, Bogdan

doi:10.1049/iet-gtd.2013.0298

Cited by 12 publications

(18 citation statements)

References 31 publications

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“…In our previous work [13], an output-feedback controller for HVDC converters has been developed using an LQ pole placement [13]. In this present work an H-infinity control theory is used to take into account not only the nominal model of the system, but also the family of disturbed models presented in Section 3.2.4.…”

Section: Synthesis Of the Control Lawmentioning

confidence: 99%

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Multivariable control with grid objectives of an HVDC link embedded in a large-scale AC grid

Arioua

Marinescu

2015

International Journal of Electrical Power & Energy Systems

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International audienceThe HVDC links are increasingly used not only to interconnect asynchronous AC systems but are also embedded into a same meshed AC power system. Thanks to its speed and flexibility, the HVDC technology is able to provide transmission system advantages as transfer capacity enhancement and power flow control. In addition, studies have shown that the way of controlling the HVDC converters impacts the stability of the AC system. This can be particularly exploited to enhance the dynamic power system performances during transients. In this paper a robust multivariable control design for HVDC link converters is proposed. It is based on the coordination of the control actions of the HVDC converters and the use of a control model which takes into account the dynamics that mostly impact stability of the neighbor zone of the HVDC link. This new methodology was used to synthesize the controller for an actual grid 1000 MW HVDC link reinforcement project called ''Midi-Provence'' in the southern part of the French grid. The synthesis , implementation and validation processes are presented in detail. The new controller is tested in comparison with the standard vector control. A large-scale dynamic model of the whole European power system, currently used and updated by the European TSO's for the interconnection studies has been used with Eurostag simulation software. Ó 2015 Elsevier Ltd. All rights reserved. Introduction The HVDC link is a mean of transmission of electric power based on high power electronics. Thanks to its speed and flexibility, the HVDC technology is able to provide the transmission system advantages as transfer capacity enhancement and power flow control [1]. Initially, it was used in power systems to interconnect asyn-chronous AC systems. The ends of the HVDC link are electrically independent one from each other and this reduces significantly the propagation of perturbations between the two AC grids as it is the case of the England–France interconnection [2]. Nowadays, HVDC links are increasingly embedded into a same meshed AC system in order to enhance the grid's transmission capability and flexibility of the power system. In this context, the HVDC link co-exists with other AC system elements as for instance AC lines and generators. Several projects of insertion of this type of device in a meshed AC system are underway in Europe, as for instance France–Spain HVDC project [3], France–Italy interconnection and Midi-Provence HVDC project [4]. This latter is our case of study. In fact, a 1000 MW HVDC link will be inserted in France between the two areas Fos and Gaudière, in order to enhance capacity of power transmission and the stability of the Midi-Provence region. The need of such HVDC link is due to the fact that only one single 400 kV AC line interconnects the two areas (see Fig. 1). It was shown that the strategy used to control the HVDC converters can impact the stability of the system in which the link is embedded [5–12]. This conducted us develop a methodology which takes into accou...

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Section: Synthesis Of the Control Lawmentioning

confidence: 99%

“…As a consequence, power system performances are enhanced in addition to local performances. Preliminary results have been presente in [13]. This approach is fully developed here in order to take into account some key critical fault situations at the synthesis stage using the robust H ∞ theory.…”

Section: Introductionmentioning

confidence: 99%

Multivariable control with grid objectives of an HVDC link embedded in a large-scale AC grid

Arioua

Marinescu

2015

International Journal of Electrical Power & Energy Systems

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“…(17) one has 1 one nally gets that state variable x 1 is a function of the at output and its derivatives…”

Section: Systemmentioning

confidence: 99%

“…The integration of renewable energy sources in the electricity grid has imposed in several cases the development of methods for power transmission through AC to DC and DC to AC conversion, and with the intervention of high voltage DC (HVDC) lines [1][2][3][4][5][6][7]. The present paper proposes a global linearization approach, through differential atness theory, for the problem of nonlinear feedback control and state estimation of a Voltage Source Converter -HVDC line system.…”

Section: Introductionmentioning

confidence: 99%

A global linearization approach to control and state estimation of a VSC-HVDC system

Rigatos

Siano

Wira

et al. 2015

2015 International Conference on Clean Electrical Power (ICCEP)

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The paper proposes a new control method for the\ud VSC-HVDC system, that is for an AC to DC voltage source\ud converter connected to the electricity grid through a high voltage\ud DC transmission line terminating at an inverter. By proving\ud that the VSC-HVDC system is a differentially at one, its\ud transformation to the linear canonical form becomes possible.\ud This is a global input-output linearization procedure that results\ud into an equivalent dynamic model of the VSC-HVDC system\ud for which the design of a state feedback controller becomes\ud possible. Furthermore, to estimate and compensate for modeling\ud uncertainty terms and perturbation inputs exerted on the VSCHVDC\ud model it is proposed to include in the control loop a disturbance\ud observer that is based on the Derivative-free nonlinear\ud Kalman Filter. This ltering method makes use of the linearized\ud equivalent model of the VSC-HVDC system and of an inverse\ud transformation which is based on differential atness theory and\ud which nally provides estimates of the state variables of the initial\ud nonlinear model. The performance of the proposed VSC-HVDC\ud control scheme is tested through simulation experiments

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“…The integration of renewable energy sources in the electricity grid has imposed in several cases the development of methods for power transmission through AC to DC and DC to AC conversion, and with the intervention of high voltage DC (HVDC) lines. Towards the design of more efficient control schemes for VSC-HVDC grid connections the following results can be noted: in [1][2][3] H ∞ control has been proposed for high voltage direct current links. In [4,5] and [6] input-output linearization of the voltage converter (VSC) and HVDC link is performed and accordingly a state feedback controller is developed.…”

Section: Introductionmentioning

confidence: 99%

A Global Linearization Approach to Control and State Estimation of a Voltage Source Converter: HVDC System

et al. 2015

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A control method is developed for the VSCHVDC\ud system, that is for an AC to DC voltage source\ud converter connected to the electricity grid through a high\ud voltage DC transmission line terminating at an inverter. By\ud showing that the VSC-HVDC system is a differentially flat\ud one, its transformation to the linear canonical form becomes\ud possible. This is a global input–output linearization procedure\ud that results into an equivalent dynamic model of the\ud VSC-HVDC system for which the design of a state feedback\ud controller becomes possible. Moreover, to estimate and\ud compensate for modeling uncertainty terms and perturbation\ud inputs exerted on the VSC-HVDC model it is proposed to\ud include in the control loop a disturbance observer that is based\ud on the Derivative-free nonlinear Kalman Filter. This filtering\ud method makes use of the linearized equivalent model of the\ud VSC-HVDC system and of an inverse transformation which\ud is based on differential flatness theory and which finally provides\ud estimates of the state variables of the initial nonlinear model. The performance of the proposed VSC-HVDC control\ud scheme is evaluated through simulation experiments

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Control of high voltage direct current links with overall large‐scale grid objectives

Cited by 12 publications

References 31 publications

Multivariable control with grid objectives of an HVDC link embedded in a large-scale AC grid

Multivariable control with grid objectives of an HVDC link embedded in a large-scale AC grid

A global linearization approach to control and state estimation of a VSC-HVDC system

A Global Linearization Approach to Control and State Estimation of a Voltage Source Converter: HVDC System

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