dcpowerflowcontroller (dcPFC) is regarded as an effective technology to improve the power distribution capability in a complex dcpower grid. Among different types of dcPFCs, the interline dc power flow controller ...
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dcpowerflowcontroller (dcPFC) is regarded as an effective technology to improve the power distribution capability in a complex dcpower grid. Among different types of dcPFCs, the interline dc power flow controller (IdcPFC) can realize multiline powerflow control functions in a complex dc grid. In this paper, a modular interline dc power flow controller based on switch isolation (ISO-IdcPFC) and a decoupling and phase shift control method of ISO-IdcPFC are proposed. ISO-IdcPFC has the advantages of modularity, scalability and multi-level outputs. By utilizing the dual-target decoupling and multi-carrier phase shift control method, ISO-IdcPFC can realize flexible and economical line current adjustment. Based on these, simulation models built in PLECS and downscaled experiment setup are used to validate the effectiveness of the proposed topology and the control method.
In order to address the issue of insufficient powerflow control capability and difficulty in limiting fault current in Multiterminal HVdc (MTdc) grids, this paper presents an interline dc power flow controller (IdcPF...
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ISBN:
(纸本)9781728163444
In order to address the issue of insufficient powerflow control capability and difficulty in limiting fault current in Multiterminal HVdc (MTdc) grids, this paper presents an interline dc power flow controller (IdcPFC) with fault current limiting function and its control method. The topology of IdcPFC is introduced, and the principles of powerflow control and fault current limiting are analyzed by establishing equivalent circuit models. A time-sharing control method is proposed, which can realize the independent control of capacitor voltage and line current. The fault characteristics of IdcPFC are studied, and the control strategy under fault condition is proposed, which can realize the functions of limiting fault current and self-protection. The simulation model and down-scale experimental system of three-terminal dc system are built to verify the effectiveness of the IdcPdc under the conditions of powerflow distribution and system fault.
The interline dc power flow controller (IdcPFC) represents a significant advancement in power distribution and control within Multi-Terminal High Voltage dc (MT-HVdc) systems. Traditional IdcPFC control without extern...
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powerflow (PF) flexibility in the multi-terminal HVdc (MT-HVdc) grids is a thought-provoking issue. It leads to employing the active dcpowerflowcontroller (dc-PFC)s. Hence, this paper examines the static average m...
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powerflow (PF) flexibility in the multi-terminal HVdc (MT-HVdc) grids is a thought-provoking issue. It leads to employing the active dcpowerflowcontroller (dc-PFC)s. Hence, this paper examines the static average model (AM) and power injection model (PIM) of an interlinedc-PFC (Idc-PFC). It is to provide a suitable base for dc PF studies and easy embedding of the dc-PFCs into MT-HVdc grids' PF equations. In this regard, this paper proposes a new dc PF solver (dc-PFS) for the Idc-PFC compensated MT-HVdc grids within the well-accepted Newton-Raphson (NR) framework. It requires a few modifications in the main structure of the system's Jacobin (J) matrix compared to the uncompensated MT-HVdc grid. Also, the system's admittance matrix and its symmetry are preserved. In the proposed concept, the Idc-PFC cooperates with other MT-HVdc grid's state variables to satisfy the predetermined control objective(s). Furthermore, this paper proposes a new solution procedure (SP) to handle various system's limitations during the processes of solving the dc PF problem. Meanwhile, there is no need to modify the related J matrix. The effective and accurate performance of the Idc-PFC's models, as well as presented NR-based dc-PFS and SP, are verified by performing several simulations on the 8-bus CIGRE MT-HVdc grid.
Insufficient control flexibility in multi-terminal HVdc (MT-HVdc) grids is an important motivation to install suitable power electronic-based dcpowerflowcontroller (PFC)s to ensure grid controllability, security, a...
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Insufficient control flexibility in multi-terminal HVdc (MT-HVdc) grids is an important motivation to install suitable power electronic-based dcpowerflowcontroller (PFC)s to ensure grid controllability, security, and reliability. This article proposes a new static power injection model (PIM) for those (interline) dc-PFCs to enable dcpowerflow (PF) studies and ease integration of the PFCs in the power system analysis softwares within the well-accepted Newton-Raphson (NR) solver-based framework. HVdc lines shunt conductances are also taken in to account in this newly developed paradigm. For this purpose, the Idc-PFC, as well as other MT-HVdc grid physical/control state variables are modified in cooperation to attain predefined control objective(s). Furthermore, a novel general routine (solution procedure) is proposed to handle several system physical/control limitations during the NR-based dc PF problem solution. Static/dynamic simulations are executed on an eight-bus test MT-HVdc grid to show/confirm the accuracy, effective performance, and excellent convergence property of the proposed Idc-PFC model, NR-based dc PF solver, and technical constraints handling routine. In this situation, it is proved that the original structure and symmetry of the admittance matrix can still be kept, and a few modifications are needed to be done in the Jacobin matrix.
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