Recovery of HVDC System from DC Line Fault: a New Protection Method

Mokhtar Benasla; Tayeb Allaoui; Mostefa Brahami

doi:10.15866/ireaco.v7i1.1286

Recovery of HVDC System from DC Line Fault: a New Protection Method

Mokhtar Benasla^(1*), Tayeb Allaoui⁽²⁾, Mostefa Brahami⁽³⁾

^(*) Corresponding author

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Abstract

Recovery from DC fault represents an important aspect of HVDC (High Voltage Direct Current) operation. The recovery time depends on the characteristics of the DC and AC systems and the control strategy used to clear the fault. The main characteristic of a temporary HVDC line fault is that once started, it will not be extinguished by itself until the current is brought down to zero and the arc deionised. Thus, there has to be some control function that brings the current down to zero when a fault occurs on a DC line. If DC control and protection system modules fail, system safety will be threatened heavily. The most control function used to extinguish the DC fault is achieved by retarding the rectifier firing angle into the inverter operating region to quickly absorb all energy from the dc line and deionize the fault.
This paper presents a detailed analysis and simulation of HVDC line protection under the single pole to ground fault of CIGRE HVDC benchmark model. Furthermore, this paper presents a control strategy for HVDC to extinguish the DC fault current. This strategy attempts to improve the recovery performance of power to minimize the energy loss and prevent transient instability of the AC system. Simulation study on MATLAB.SimPowerSystems is carried out to validate the concept

Keywords

HVDC; DC Line Fault; DC Line Protection; VDCL

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References

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