Coordinated hierarchical voltage control for flexible DC distribution systems

Wei, Zhiyu; Peng, Ke; Xiao, Chuanliang; Li, Yan; Zhao, Xinhe; Yao, Guanghao

doi:10.1016/j.epsr.2021.107572

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…In Ref. [7], a modified PID control method is applied in the DCDNs, and the hierarchical voltage control function is achieved with the fast power response of the battery ESS. In Ref.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation of active voltage support control approach of DC distribution networks based on virtual inertia coordination

Chen,

Jiang,

Zhao

et al. 2023

IET Energy Syst Integration

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DC distribution networks (DCDNs) possess the advantages of high power efficiency, low operation loss, and favourable control flexibility, and are regarded as an essential form of future power distribution systems. In order to increase the voltage transient performance of DCDNs against disturbances, this paper proposes a methodology for realising the active voltage support control of DCDNs based on virtual inertia coordination. Firstly, the impact of the inertia of DCDNs towards the transient voltage change is analysed, and the active voltage support mechanism considering the variable droop inertia control and virtual DC motor inertia (VDCMI) control is explored. Then, a time sequence coordination strategy based on the voltage grading of DCDNs is developed, and an adaptive inertia coefficient is designed to achieve the inertia adjustment in terms of the voltage sag and recovery processes. Using MATLAB/Simulink, a detailed model of the double‐terminal DCDNs is created to check the efficacy of the proposed approach. Different voltage disturbance scenarios are imitated, and the comparative simulations demonstrate that the proposed approach can fully utilise the inertia potential of the DCDNs to suppress the voltage sag and smooth the voltage recovery procedure. The proposed method's validity and feasibility can be well validated.

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“…In Ref. [7], a modified PID control method is applied in the DCDNs, and the hierarchical voltage control function is achieved with the fast power response of the battery ESS. In Ref.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation of active voltage support control approach of DC distribution networks based on virtual inertia coordination

Chen,

Jiang,

Zhao

et al. 2023

IET Energy Syst Integration

View full text Add to dashboard Cite

show abstract

Alternating Iterative Power-Flow Algorithm for Hybrid AC–DC Power Grids Incorporating LCCs and VSCs

et al. 2023

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AC–DC power-flow calculation is the basis for studying HVDC systems. Since traditional iterative methods need many alternative iterations and have convergence problems, this paper proposes an alternating iterative power-flow algorithm for hybrid AC–DC power grids incorporating line-commutated converters (LCCs) and voltage source converters (VSCs). Firstly, the algorithm incorporates the converter interface model into the AC side, considering the influence of the DC side on the AC side, and establishes an AC-augmented Jacobian matrix model with LCC/VSC interface equation variables. Then, according to the type of converter, control mode, and DC grid control strategy, a DC grid power-flow calculation model under various control modes is established for realizing the power-flow decoupling calculation of AC–DC power grids incorporating LCCs and VSCs. The accuracy and effectiveness of the improved algorithm are evaluated using modified IEEE 57 bus AC–DC networks and the CIGRE B4 DC grid test system. The improved algorithm is applicable to various DC grid control modes and considers the reasonable adjustment of the DC grid variable constraints and operating modes.

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Coordinated hierarchical voltage control for flexible DC distribution systems

Cited by 2 publications

References 19 publications

Investigation of active voltage support control approach of DC distribution networks based on virtual inertia coordination

Investigation of active voltage support control approach of DC distribution networks based on virtual inertia coordination

Alternating Iterative Power-Flow Algorithm for Hybrid AC–DC Power Grids Incorporating LCCs and VSCs

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