E3S Web Conf.
Volume 84, 201914th International Scientific Conference “Forecasting in Electric Power Engineering” (PE 2018)
|Number of page(s)||10|
|Section||Selected Problems of Power Engineering|
|Published online||11 February 2019|
An alternative approach to provisions of the Network Code on blocking HVDC LCC systems during short-circuits in AC network
1 Silesian University of Technology, Institute of Power Systems and Control, Gliwice, Poland
2 PSE Innovations Ltd., Warsaw, Poland
* Corresponding author: firstname.lastname@example.org
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.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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