The application of segmentation and grid shock absorber concept for reliable power grids

Clark, H.K.; El-Gasseir, M.M.; Epp, H.D.K.; Edris, A.

doi:10.1109/mepcon.2008.4562303

Cited by 17 publications

(15 citation statements)

References 3 publications

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“…Under normal conditions, the power levels change only under the control of the operators. When a disturbance occurs, controller on each back to back station and each HVDC line increase the power flow from the system with higher frequency difference, up to the set maximum [7].…”

Section: Grid Segmentationmentioning

confidence: 99%

“…Thus, when the load in sector A is greater than the demand provided by the DC links plus its own generation, the sector will be shut down by underfrequency. The disconnection of the sector by underfrequency is a mechanism to avoid the collapse of the entire system [2] [7]. …”

Section: Grid Segmentationmentioning

confidence: 99%

“…These causes may not be a significant problem, but with the interconnected power grid and increase of AC line overload, such contingencies will increase the threats of cascading interruptions. Contingencies occur sequentially and are aggravated by operating errors, downtime, system imperfections or failures [7].…”

Section: Introductionmentioning

confidence: 99%

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HVDC Grid Segmentation Analysis for Blackouts Reduction

Santos¹,

Jota²

2017

JPEE

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Segmentation of large AC systems through DC links introduces a new concept that utilizes the advantages of direct current transmission to improve network reliability and increase power transfer capacity. Technical literature argues that the segmentation of the AC network and the introduction of DC links at these systems connection points bring benefits to system operation, once contingencies generated on one side of the DC connection point would not be reflected on the other side of DC connection, thereby reducing the likelihood of cascading shutdowns and blackouts due to load restraint on transmission lines and transformers. Amidst this scenario, this paper presents a study of the main topics regarding the use of this new network segmentation philosophy, bringing a practical point of view for the use of this concept at the electrical power system planning. The effect of DC segmentation before a contingency that would initiate major outages in an adapted electrical system model IEEE-14 bus is studied and simulations have been performed with test HVAC systems and segmented by HVDC link. The results have been compared, principally in relation to the voltage bus, reactive power generation, system losses and power flow at the lines, and demonstrated that this new concept improved the grid reliability.

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Section: Grid Segmentationmentioning

confidence: 99%

Section: Grid Segmentationmentioning

confidence: 99%

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HVDC Grid Segmentation Analysis for Blackouts Reduction

Santos¹,

Jota²

2017

JPEE

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“…However, the DC link controllers can limit the flow of power to the disturbed segment whenever it jeopardizes the supporting segments. As a result, cascading outages and collapse will be limited to only one segment which reduces the risk of widespread blackouts [12]. Owing to this peculiarity, literatures introduce the DC-segmentation as a solution for softening the blow of disturbances [13].…”

Section: -Introductionmentioning

confidence: 99%

“…It is also entitled as the grid shock absorber [13] and firewall against disturbances [17]. Therefore, the DCsegmentation provides major improvements in bulk grid security and reliability through the elimination of widespread cascading blackouts [12]. However, it does not solve all of the security concerns and reliability problems.…”

Section: -Introductionmentioning

confidence: 99%

Assessment of HVDC grid segmentation for reducing the risk of cascading outages and blackouts

Alizadeh‐Mousavi

Bizumić

Cherkaoui

2013

2013 IREP Symposium Bulk Power System Dynamics and Control - IX Optimization, Security and Control of the Emerging Power Grid

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This paper deals with a DC-segmentation of interconnected power systems which represents a relatively new and interesting approach that could be a potential solution for mitigation of the cascading outages effects. The DC-segmentation is defined as the use of DC links to split large AC grids into sets of smaller asynchronously operated AC segments. By implementing grid segmentation, it should be plausible to improve the controllability of power flows, to limit the propagation of disturbances, to reduce the risk of cascading outages and blackouts and to decrease the complexity of power systems. The statistical analysis of time series of blackouts size measures demonstrates the power law region in distributions of different quantities. This heavy tail behavior implies that the blackouts of different scales may take place and the extreme events cannot be overlooked. In order to take into account the risk of large blackouts, a new risk assessment method is developed and implemented. This method is based on Monte Carlo Simulation and takes into account the cascading outages of transmission system due to the overloading and the hidden failure of protection systems and the response of generators/loads/HVDC controllers to the power imbalance or the frequency deviation. The effectiveness of the DC-segmentation for reducing the risk of large blackouts is assessed using the proposed risk assessment method applied to a simplified model of the potential future intercontinental power grid of Europe and Russia. The distributions and expected values of the blackout size quantities (including Load Not Served (LNS), Number of Transmission component Outage (NTO) and Energy Not Served (ENS)) are evaluated before and after the DCsegmentation.

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DC segmentation: A promising solution to improve angle stability of stressed power systems

Robin¹,

Renedo²,

Gonzalez‐Torres³

et al. 2021

IET Conf. Proc.

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In the last decades, various events have shown that electromechanical oscillations are a major concern for large interconnected Alternating Current (AC) power systems. Segmentation of AC power systems with High Voltage Direct Current (HVDC) systems (DC segmentation, for short) is a method that consists in turning large AC grids into a set of asynchronous AC clusters linked by HVDC links. It is a promising solution to mitigate electromechanical oscillations and other issues. In particular, an appropriately placed DC segmentation can stop a selected inter-area electromechanical oscillation mode. However, without supplementary controllers, DC segmentation will not contribute to the damping of the intra-area oscillation modes in the remaining AC clusters and will deteriorate the frequency stability of the power system. This paper aims at filling this gap and proposes the use of DC segmentation with HVDC systems based on Voltage Source Converters (VSC-HVDC) with supplementary controllers in the converter stations: (a) active-power supplementary controllers for frequency support among the asynchronous AC clusters and (b) a reactive-power supplementary controllers for Power Oscillation Damping (POD-Q), in order to damp the intra-area oscillation modes. The proposed supplementary controllers and their design will be presented, and their efficiency will be demonstrated on the Nordic 44 test system with DC segmentation by means of nonlinear time-domain simulation and small-signal stability analysis.

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The application of segmentation and grid shock absorber concept for reliable power grids

Cited by 17 publications

References 3 publications

HVDC Grid Segmentation Analysis for Blackouts Reduction

HVDC Grid Segmentation Analysis for Blackouts Reduction

Assessment of HVDC grid segmentation for reducing the risk of cascading outages and blackouts

DC segmentation: A promising solution to improve angle stability of stressed power systems

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