Optimal placement of direct current power system stabiliser (DC‐PSS) in multi‐terminal HVDC grids

With increasing energy demand, the use of renewable energy resources is increasing. Renewable energy sources require power electronic converters to get integrated into power grids. Multi‐terminal high voltage direct current (MT‐HVDC) systems are a promising solution for their grid integration. Using droop‐based controller strategies in power converter stations of MT‐HVDC grid, in addition, to providing power‐sharing, can support the frequency of the connected AC grids. However, power changes lead to direct voltage deviations, thereby disrupting the stability of the MT‐HVDC system. Here, a new control structure for the droop controller of the voltage source converter (VSC) controller is proposed which is named modified droop controller (M‐Droop). This method, in addition to power‐sharing, uses an appropriate control action to provide the required voltage stability. Here, analytical studies of the modified control strategy are reported. Moreover, through a developed MATLAB Simulink platform, its performance is verified in the events of transients, consisting of fault, variable load, and change in power generation.

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“…According to the results obtained in [22], Ba-B1 has been selected as the appropriate location for M-droop placement.…”

Section: Understudy Network and Its Modelingmentioning

confidence: 99%

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

Azizi

CheshmehBeigi

Rouzbehi

2022

IET Generation Trans & Dist

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“…However, addressing the problem of oscillations in HVDC system needs more effort yet [14] and none of them has investigated a combination of droop control and power system stabilizer (PSS) applied to the DC side of modular multi‐level converters—based HVDC (MMC‐HVDC) stations. The proposed supplementary controller in [17] applied to the DC side of the VSC converter and its parameters tuned by particle swarm optimization (PSO) algorithm considering VSC‐HVDC and π line modelling. In [17], the VSC average model is used for converter modelling and the π‐section model is used for the line modelling.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed supplementary controller in [17] applied to the DC side of the VSC converter and its parameters tuned by particle swarm optimization (PSO) algorithm considering VSC‐HVDC and π line modelling. In [17], the VSC average model is used for converter modelling and the π‐section model is used for the line modelling.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the effects of DC‐PSS are studied in small‐signal modelling and frequency response analysis. The main differences between this article and [17] are listed as follows. The main purpose of [17] is to introduce a method for optimal location of the stabilizer in a VSC‐based grid, which used π‐model to transmission line modelling.…”

Section: Introductionmentioning

confidence: 99%

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HVDC grids stability improvement by direct current power system stabilizer

Azizi

CheshmehBeigi

Rouzbehi

2021

IET Generation Trans & Dist

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High-voltage direct current breaker is among the essential components of high-voltage direct current grids. Such a breaker generally needs a direct current reactor to reduce the fault currents rate. However, direct current reactors have destructive effects on the multiterminal high-voltage direct current grid dynamic stability, and in such a system, despite the variety of controllers, the system dynamics are highly sensitive to the operating point. Therefore, additional damping control will be needed. This paper proposes a modification to be applied to the traditional droop controller of high-voltage direct current grids to cope with the influence of these large reactors, improving the direct voltage stability and decreasing power variations in the transient events by introducing a direct current power system stabilizer. The proposed method for direct voltage control has been investigated through the analytical model of the system. Stability improvement has been studied following the application of the proposed method by investigating zeros, poles, and frequency response analysis. Moreover, a method is proposed for optimal design and optimal placement of direct current power system stabilizer. The system analysis and time-domain simulations demonstrate a decent damping improvement attained by the proposed method. All simulations and analytical studies are conducted on Cigré DCS3 test high-voltage direct current grid in MATLAB/Simulink.

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“…The concept of the DC power system stabilizer (DC-PSS) was proposed to eliminate negative effects caused by the DC reactor, and the best location for the installation was discussed in Reference [21]. Similar to a conventional power system stabilizer (PSS), the DC-PSS provides additional damping by modulating power references of converters.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Control of Damping in VSC–MTDC System with DC Circuit Breakers

Gao

Zhou

et al. 2021

Symmetry

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DC circuit breaker (DCCB) systems with a DC reactor in series are normally equipped in the voltage-sourced-converter-based multi-terminal DC (VSC–MTDC) systems for DC fault clearance. However, it is revealed that the use of DC reactors could undermine the system damping and deteriorate the system stability. In this paper, a controller based on hybrid sensitivity is proposed to improve the stability of power system and realize the power symmetry of multi-terminal systems. Firstly, based on a generalized MTDC small-signal model, an eigenvalue analysis is performed to provide deep insight into the stability issue imposed by DC reactors. Furthermore, a local controller based on hybrid sensitivity was proposed, and on this basis, a global controller was designed to solve asymmetrical power flow. Finally, a four-terminal VSC–MTDC model was built in Simulink to evaluate the performance of DC-PSS. Simulation results verify the effectiveness of the proposed controller in stabilizing MTDC systems and symmetrizing of power flow.

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Optimal placement of direct current power system stabiliser (DC‐PSS) in multi‐terminal HVDC grids

Cited by 13 publications

References 29 publications

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

HVDC grids stability improvement by direct current power system stabilizer

Investigation and Control of Damping in VSC–MTDC System with DC Circuit Breakers

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