Influence of Power System on Operation of an HVDC Link. A Case Study

Przygrodzki, M.; Rzepka, P.; Szablicki, M.

doi:10.12736/issn.2300-3022.2016110

Cited by 1 publication

(3 citation statements)

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“…The most dangerous short-circuits are short-circuits that cause significant voltage asymmetry at the LCC connection point. These are mainly single-phase short-circuits and especially single-phase Automatic Reclosing in Lines (ARL) connected to the LCC [9,[11][12][13]. Usually, such events are accompanied by unwanted multiple commutation failures.…”

Section: Simulation Tests For Lcc Systems During Short-circuits In Thmentioning

confidence: 99%

“…The most important components of the model in the control layer are: multilayer blocks of controllers of the rectifier part and the inverter part as well as the master LCC control block. The description of the SwePol Link model is given in [9][10][11][12][13][14]. For the developed model, the LCC behavior tests were conducted during single-phase short-circuits and ARL in AC network lines.…”

Section: Simulation Tests For Lcc Systems During Short-circuits In Thmentioning

confidence: 99%

“…For this ADAR operation mode in order to determine the LCC power reduction level it is required to know what are the current operating conditions of the AC network during a short-circuit. The authors' research in [9][10][11][12][13][14] indicate that for most cases it is sufficient to control the voltage value at the point of connection, the phase angle of this voltage and the value short-circuit power. The information about the current value and phase angle of the voltage will provide an access to the voltage transformers at the LCC connection point.…”

Section: Decisionmentioning

confidence: 99%

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An alternative approach to provisions of the Network Code on blocking HVDC LCC systems during short-circuits in AC network

et al. 2019

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The Network Code for HVDC systems introduces a requirement for such systems to remain in operation in an AC network during short-circuits. This requirement (among others) is determined by a time curve of a minimum voltage in HVDC connection point. The HVDC system is not allowed to be turned-off while the voltage value exceeds the values of the curve, however the HVDC system in LCC technology does not meet this requirement. The Network Code introduces the possibility of blocking the LCC systems. After the LCC system is blocked it stops transmitting the power, which prevents the LCC system from being turned off during a short-circuit in the network but results in a lack of power exchange between the network and the LCC system. Therefore, the authors developed a proposal to limit the power level being transmitted by the LCC system, thus there is no necessity to block the LCC system operation. The simulation research carried out clearly indicate the validity of this idea. In addition, the authors presented the concept of an automation system that adaptively adjusts the scale of the LCC system power level reduction to change the network operating conditions during a short-circuit in the network. The operation of this automation system is presented for the practical LCC system model installed in the Polish Power System.

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Section: Simulation Tests For Lcc Systems During Short-circuits In Thmentioning

confidence: 99%

Section: Simulation Tests For Lcc Systems During Short-circuits In Thmentioning

confidence: 99%

Section: Decisionmentioning

confidence: 99%

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