Abstract
The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenarios, this paper investigates a novel control scheme for voltage angle droop controlled HVDC (VAD-HVDC) systems. The proposed scheme to alleviate the circuit overload is estimated firstly by calculating the severity index when the power flow changes under N-1 situations. Then the voltage angle controlled HVDC system is applied on the modified IEEE 39-bus 10-machine test power system for the time-domain simulation. The dynamic behavior in the HVDC station validates that the VAD control can stabilize the DC voltage and possess a good ability against interference. In addition, the dynamic characteristics analysis on the AC transmission lines proves that the hybrid AC/DC system integrated with the VAD controlled HVDC system are in possession of good stability after the N-1 contingency event. The VAD controller employed in the HVDC system is capable of effective congestion management to mitigate the critical loadings on the transmission lines.
Highlights
Considering the energy transition in Germany, many1wtraindditiotunrablipnoeswearreplainnsttsaallreedshinut northern down in Germany the south.and The current AC transmission lines are not enough to transmit massive power from the north to the south
Based upon the aforementioned problem, this paper focuses on achieving good dynamic performance and control capability by further exploiting the dynamic behavior of the proposed voltage angle droop (VAD)
This paper emphasizes the dynamic analysis of the hybrid AC/DC power system integrated with the VAD controlled HVDC system in curative congestion management scenarios
Summary
1wtraindditiotunrablipnoeswearreplainnsttsaallreedshinut northern down in Germany the south. It is permitted that certain N-1 cases in the network can first trigger overload situations, which are alleviated or resolved by means of corrective measures [4] To this end, HVDC corridors can be used as power flow regulating equipment to counteract this in case of an N-1 scenario. More consideration should be given to dynamic analysis and time-domain simulations involved in the issue of the usage of HVDC links for alleviating congestion in power systems. The VAD method used in this paper was first proposed and designed in detail in [14] It has been verified in our recent work that this method is very efficient to alleviate the overloads for a change in power flow due to an N-1 contingency or a change in load demand.
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