Current Sharing in Multiterminal DC Grids—The Analytical Approach

Eriksson, Robert

doi:10.1109/tpwrs.2018.2849075

Cited by 10 publications

(2 citation statements)

References 32 publications

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“…According to the reference direction of the current defined as above, the elements in A 0 can be defined in Equation (19).…”

Section: Short-circuit Characteristic Calculation Methods 41 Node Voltage Equations For the Pre-fault DC Gridmentioning

confidence: 99%

“…In [18], relying on the modified averaged value models, DC fault current simulation is performed for protection design in radial multi-terminal DC systems. In [19], the dynamic analysis is carried out for voltage source converter based multi-terminal DC grids (VSC-MTDC) in order to analytically design a generalized feedback for DC voltage droop control. Although, converter outages and communication loss are considered, the article does not analyze line outages or DC faults.…”

Section: Introductionmentioning

confidence: 99%

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Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Cai¹,

Zhang

et al. 2021

Applied Sciences

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DC short-circuit faults are one of the challenges for modular multilevel converter (MMC) based DC grid. It is vital for proper design of protection system to estimate the fault currents and voltages. The existing calculation methods based on RLC equivalent model of MMC have enough accuracy in estimating the branch currents but suffer from poor accuracy in estimating the node voltages. To better reflect the dynamics of MMC control during the fault, MMC is equivalent to a RLC series circuit in parallel with a variable controlled current source. This model not only considers the discharge of sub-module capacitors but also the AC active power and MMC control. Then, based on the discrete adjoint model of the equivalent MMC model and the RL series equivalent model of DC lines, the fault voltages and currents for the pre-fault and faulted DC grids could be easily obtained. From the aspect of power balance, the importance of AC active power on estimating the fault currents and voltages is discussed then. At last, based on the Zhangbei bipolar DC grid, comparisons are conducted between the simulations on PSCAD, the numerical calculation under the proposed method and the existing methods. The results show that the proposed method and the existing methods are both able to accurately estimate the fault currents within a relative error of 1%. However, compared with the error of the existing methods in calculating the fault voltages, the relative error for the proposed method is limited to less than 5% for the whole DC gird.

show abstract

“…According to the reference direction of the current defined as above, the elements in A 0 can be defined in Equation (19).…”

Section: Short-circuit Characteristic Calculation Methods 41 Node Voltage Equations For the Pre-fault DC Gridmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Cai¹,

Zhang

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

Power flow analysis of AC-DC networks considering hierarchical connection technique

Chen

Dong

Yang

et al. 2020

International Journal of Electrical Power & Energy Systems

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Identifying suitable DC system models for an independent design of VSC controllers in MTDC grids

Ahmadloo,

Pirooz Azad

2023

International Journal of Electrical Power & Energy Systems

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Current Sharing in Multiterminal DC Grids—The Analytical Approach

Abstract: His research interests include power system dynamics and stability, HVDC systems, dc grids, and automatic control.In 2018, he received the title of Docent at the KTH Royal Institute of Technology.

Cited by 10 publications

References 32 publications

Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Fault Current and Voltage Estimation for Pole-to-Pole Faults in Modular Multilevel Converter Based DC Grids Considering AC Active Power

Power flow analysis of AC-DC networks considering hierarchical connection technique

Identifying suitable DC system models for an independent design of VSC controllers in MTDC grids

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