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This letter proposes a simple modelling for multi control modes of HVDC into Newton-Raphson
(NR) load flow algorithm. This modelling is based on power injection approach. HVDC is
represented with injected loads as a function of the desired power flow through transmission line.
During the iterative process, these loads are updated and injected at th...
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The Optimal Unified Power Flow Controller (OUPFC) is an efficient series-shunt controller that is incorporated to system to control the power flow through the transmission lines. Modeling of such controller is a challenge task due the required complex modifications of the Newton Raphson power (NR) flow to consider the parameters of the OUPFC. The a...
Citations
... In the receiving-end grid, the electrical distance between HVDC2 and HVDC1 and the electrical distance between HVDC2 and HVDC3 are both 20 km. HVDC has four common control modes [22], in this paper, the rectifier station adopts the constant current control, and the inverter station adopts the switch-off angle control. The parameters of the controller are determined mainly according to the engineering experience method. ...
HVDC auxiliary emergency power control can improve the transient stability of AC/DC power system. Compared with other control methods, HVDC auxiliary emergency power control has the advantages of quick response, large adjustment capacity and less investment, so it is the primary choice to improve the transient stability. Taking multi-infeed DC (MIDC) transmission system as the research object, based on the definition of the traditional power support factor, considering the influence of the electrical connection of the sending-end power grid on the power support, a new power support factor (NPSF) is defined. Based on the NPSF, multiple DC coordination sharing strategies are implemented when one of the DC faults occurs. Finally, MIDC is built on the PSCAD. Single DC auxiliary power control and multiple DC auxiliary power coordinated control were simulated, respectively. Rationality of the definition of NPSF is verified, and it is concluded that multiple DC joint power control is superior to single DC.
Offshore wind farms equipped with Direct Drive Permanent Magnet Synchronous Generators (DD-PMSG) are drawing increased attention due to their advantage over other variable speed technologies. VSC-HVDC links are considered the most suitable option for transferring power to the onshore system. The integration of VSC-HVDC connected DD-PMSG based offshore wind farms into multi-machine systems is explored in this paper. A novel approach for power flow and initial condition calculations is proposed to facilitate dynamic analysis of the system. For three cases of the most commonly specified quantities of the wind farm, efficient methods have been described. The cases comprise combinations of data like the total output of the wind farm, the number of wind turbines, the wind speed, or the output of individual wind turbine, which are frequently given in literature. This approach enables the user to build the dynamic model of the system in any basic graphical dynamic modeler and numerical computational software without requiring power system toolboxes or electromagnetic transient packages. The proposed methods are highly effective for studies focusing primarily on the dynamic aspects and controls of the system. Case studies and simulations are conducted to verify the proposed technique.
