NDLI: Real-time estimation of AC-grid short circuit capacity for HVDC control application

Content Provider	IET Digital Library
Author	Babazadeh, Davood Muthukrishnan, Arvind Mitra, Pinaki Larsson, Tomas Nordström, Lars
Abstract	Being able to estimate the AC grid strength using short circuit capacity (SCC) from the perspective of a connected high-voltage direct current (HVDC) station allows adjustment of converter control parameters or to select the converter's operational control mode. The SCC can be calculated by estimation of the grid's impedance and its equivalent voltage. This study presents the operational and practical challenges in real-time implementation of the grid estimation algorithms especially for HVDC applications. This study shows that the recursive least-square algorithm can be very efficiently used for the real-time estimation of SCC. This technique forms a regression problem using algebraic complex equations with an objective to minimise the error between estimated and measured parameters. The algorithm has been reformulated and simplified to make it non-complex without the use of matrices, in order to facilitate further implementation on an industrial real-time controller. The performance of the real-time implementation has been evaluated using a hardware-in-the-loop platform. A sensitivity analysis has been also carried out to study the impact of different parameters and operational conditions on the performance of the estimation algorithm. Finally, the actual application of real-time SCC estimation for the HVDC systems has been demonstrated.
Starting Page	838
Ending Page	846
Page Count	9
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 4, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.0465
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-03-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Grid Strength AC-grid Short Circuit Capacity Algebra Algebraic Complex Equation Control of Electric Power System Converter Control Parameter Converter Operational Control Mode D.C. Transmission Equivalent Voltage Estimation Theory Grid Estimation Algorithm Grid Impedance High-voltage Direct Current Station HVDC Control Application HVDC Power Converter HVDC Power Transmission HVDC Station HVDC System Industrial Real-time Controller Interpolation And Function Approximation Least Squares Approximation Linear Algebra Numerical Analysis Power Electronics Power Grid Power Supply Power Transmission Control Recursive Least-square Algorithm Regression Analysis Regression Problem SCC Estimation Sensitivity Analysis Statistics Supervisory Circuit
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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