Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Xing, Yankai; Marinescu, Bogdan; Belhocine, M.; Xavier, Florent

doi:10.1109/isgteurope.2018.8571732

Cited by 9 publications

(21 citation statements)

References 15 publications

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“…In this new frequency range, these inter-area modes are close to other modes of different nature which may be disturbed by the HVDC POD controller when synthesized by classic means [2]. This has been shown in our previous work [3] in which a solution to overcome this has been proposed. It is based on the use of an improved control model which captures all these dynamics and opens the way to advanced control.…”

Section: Introductionmentioning

confidence: 53%

“…The classic IEEE damping controller design synthesis [2] is simple but tends to lack of robustness even after careful tuning, which is due to that its phase compensation is settled down for a specific grid situation which may not be suitable for changed phase of residue of the mode. Also, robustness of the pole placement (done by LQG control) in the improved control framework reported in previous work [3] can be improved by the formalism below which has also the advantage to directly consider the damping target specification in the control synthesis.…”

Section: Robustnessmentioning

confidence: 99%

“…In this section, performance is tested on the full nonlinear system and compared systematically for the 3 controllers: the classic POD, the LQG and the H ∞ ones. The tuning of classic and LQG PODs are detailed in [3]. Figure 4 shows the responses of the speed of generator GE911 to a 100ms duration short-circuit at the terminal bus of generator GE918.…”

Section: Controller Tuningmentioning

confidence: 99%

“…The main drawback of this approach or closely related H 2 /LQ techniques [8], [9] is that the resulting control has the same order as the plant making it difficult to apply to large-scale power systems. However, this problem can be overcome by the use of low-order control model mentioned above and already used in [3].…”

Section: Introductionmentioning

confidence: 99%

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Robust Research of Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Xing

Marinescu

Xavier³

2019

2019 IEEE Milan PowerTech

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This paper proposes a mixed sensitivity H∞ controller to deal with damping of inter-area oscillations with a HVDC inserted in a meshed AC grid. In this case, inter-area modes may be at higher frequencies, close to other modes of the system. The classic tuning methods of standard (IEEE) power oscillations damping controller may not give satisfactory results for dynamics. A robust controller which is effective under different operating conditions is required. The controller design has been carried out based on the H∞ mixed-sensitivity formulation in a LMI framework with pole-placement constraints. Investigations with nonlinear model of the system were done to settle and validate the approach. The efficiency and robustness of the proposed controller are tested and compared with a standard IEEE controller and a Linear Quadratic Gaussian one.

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Section: Introductionmentioning

confidence: 53%

Section: Robustnessmentioning

confidence: 99%

Section: Controller Tuningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Robust Research of Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Xing

Marinescu

Xavier³

2019

2019 IEEE Milan PowerTech

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“…Although this kind of control has been tested on real applications, no dynamic analysis has been done. Also, regarding the use of angles as the feedback signal, recently a PSS-like control using angle difference as feedback signal was proposed in [20] for designing an oscillation damping control.…”

Section: Introductionmentioning

confidence: 99%

Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

Gonzalez‐Torres

Damm

Costan

et al. 2020

IET Generation, Transmission & Distribution

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This paper investigates the impact of embedded Voltage Source Converter-based High Voltage Direct Current (VSC-HVDC) links on AC grids transient stability. Firstly, using Transient Energy Functions (TEF), it is demonstrated that VSC-HVDC links controlled to track constant power references, do not inherently improve transient stability of the surrounding AC grid as an AC line naturally does. Then, a control law using the feedback linearization technique on a simple but representative power system is derived. The control law highlights and combines the three main actions the VSC-HVDC link can offer to enhance rotor angle stability: fast power reallocation, injection of synchronising power and injection of damping power. The control law is implemented and validated in EMT simulation. It is then shown that an HVDC link can assure the synchronisation of different AC areas even if no AC transmission lines interconnect them. Through another case study, it is shown how the HVDC link can help to share dynamic frequency reserves in order to not jeopardise the stability of the system. A last example investigates the effect of a DC fault on AC transient stability and how the control can help improving the system response.

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Advanced control to damp power oscillations with VSC‐HVDC links inserted in meshed AC grids

Xing

Kamal

Marinescu

et al. 2021

Int Trans Electr Energ Syst

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In this article, we consider the particular situation of a HVDC link inserted in a meshed AC grid, which has interarea modes at upper frequencies than the usual ones. In this case, the standard IEEE (lead-lag plus gain) controllers may not be efficient. As a matter of fact, in this grid situation, the control is challenged by unstable zeros and system uncertainties, systematically put into evidence. Two original robust strategies based on matching a reference model using LMI optimization approach are designed to provide coordinated active and reactive power modulation for the HVDC link. They are based on a reduced order control model of the HVDC and the neighboring AC zone, which integrates the dynamics of interest. Besides increased damping and diminished impact of the unstable zeros, this new control achieves robustness against grid variations. Investigations with both linearized and nonlinear model of the system are carried out to settle and validate the approach. The efficiency and robustness of the proposed controllers are tested and compared with the ones of several standard controllers on a realistic benchmark of 19 generators interconnected by a meshed AC grid.damping controller, HVDC, interarea modes, power system oscillations, robustness | INTRODUCTIONElectromechanical oscillations are a major concern of today power grids. This is a problem of power system oscillatory stability, as shown, for example, in Europe in December 2016 when low damping oscillations related to the most spread interarea mode (at 0.15 Hz) have been experienced. 1 When provided with supplementary damping control, the HVDCs have a good damping effect, which can be used to solve the problem of low-frequency oscillations between regions. Especially, voltage source converters (VSC)-HVDC transmission systems have the advantage to control both active and reactive power. This provides the opportunity to maintain system stability through supplementary power oscillations damping (POD) loops of control for both active and/or reactive power modulations. 2 The most analyzed and controlled in the past were the most spread interarea modes of the interconnected system, which are the ones in which are involved a large number of generators. They are at low frequencies, for example, around 0.2 Hz in Europe. Recent HVDC reinforcements in Europe (like France-Italy interconnection) are in the oscillation path of interarea modes of higher frequencies, around 1 Hz. There are also other dynamics of the grid in this frequency range (see References 3,4). These different dynamics should be taken into account more directly than in classic POD controllers (IEEE structures) and methodologies for gain computation (like, eg, Reference 5).

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Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Cited by 9 publications

References 15 publications

Robust Research of Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Robust Research of Power Oscillations Damping Controller for HVDC Inserted in Meshed AC Grids

Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

Advanced control to damp power oscillations with VSC‐HVDC links inserted in meshed AC grids

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