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This paper presents a method based on V-Q sensitivity and modal analysis to study the transient voltage stability of receiving AC network with HVDC feeding. When faults of receiving network occur, HVDC recovery characteristics are analyzed, which have an important effect on voltage stability of receiving network. The model of active power and reactive power time series responding to the recovery characteristics...
The large demand of dynamic reactive power for MIDC recovery is a big challenge to voltage stability of the receiving system. Thus, the research on active power (P) and reactive power (Q) characteristics of inverter station in the recovery process of multi-infeed HVDC (MIDC) attracts more and more attention. With the CIGRE HVDC benchmark, this paper studies the P and Q responses under various faults...
To construct the largest power simulation model with real time digital simulators (RTDS), assignment of the computing resource is an important issue to make the model feasible. For automatic computing resource assignments, the interesting idea of subgraph isomorphism is proposed. Computing units (racks) are connected with communication wires, whereas the power grid is connected with electrical lines...
A new COI-based backstepping sliding-mode method for emergency frequency control of interconnected AC/DC power systems is proposed in this paper. It aims to provide inter-area power support to the disturbed control area(s) through the intact interconnecting structure under emergency conditions, when the normal Automatic Generation Control (AGC) is suspended to avoid worsening frequency stability....
Partial discharges (PD) in HVDC equipment are not the predominant degradation factor. However, they can be a failure precursor (particularly when electrical trees are formed), so that monitoring PD could be a tool to infer imminent failures. In order to monitor PD on site, one major problem at DC voltage is the absence of tools able to distinguish noise from PD signals. In this paper, corona, surface...
This paper illustrates a study on HVDC light for its enhancement of AC/DC hybrid transmission system and multi-infeed HVDC system. In the sense of the realizing independent controlling of active and reactive power, HVDC light is more effective compared to the conventional HVDC system. An AC/DC parallel transmission system and a three-infeed HVDC system are modeled using PSCAD/EMTDC. Simulations corresponding...
Representation of high voltage direct current (HVDC) transmission links in power system stability studies requires special attention. A detailed model, while very precise, requires considerable time for modeling and calculation. Simplified models, on the other hand, do not always provide sufficiently accurate results. In this paper, simplified and detailed HVDC simulation models are described and...
To improve the dynamic response of the parallel AC/DC transmission system, constructive nonlinear control designation has been introduced into the typical nonlinear system. In according to the diversity of nonlinear phenomena, lots of nonlinear controls are proposed. The constructive nonlinear control using the dissipativity and passivity concept can guarantee the stability and robustness of the system...
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