Load-Switching Strategy for Voltage Balancing of Bipolar DC Distribution Networks Based on Optimal Automatic Commutation Algorithm

Liao, Jianquan; Zhou, Niancheng; Wang, Qianggang; Chi, Yuan

doi:10.1109/tsg.2021.3057852

Cited by 21 publications

(14 citation statements)

References 16 publications

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“…Alternating current (AC)-DC conversion not only increases the transmission capacity but also helps boost the penetration level of renewable generations [1]. DC distribution networks also improve the power supply efficiency for DC loads such as electric vehicles, as the loss caused by AC-DC conversion can be avoided [2]. With the advantages of the DC distribution network, a bipolar DC distribution network represents a highly reliable DC system because the faults that occur in one line do not propagate to the other two lines [3].…”

Section: A Indices and Sets I J K Qmentioning

confidence: 99%

Multi-objective Day-ahead Polarity Switching Optimization for Voltage Unbalance in Bipolar DC Distribution Networks

Huang¹,

Wang²,

Chen³

et al. 2023

Journal of Modern Power Systems and Clean Energy

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Bipolar direct current (DC) distribution networks can effectively improve the connection flexibility for renewable generations and loads. In practice, concerns regarding the potential voltage unbalance issue of the distribution networks and the frequency of switching still remain. This paper proposes a day-ahead polarity switching strategy to reduce voltage unbalance by optimally switching the polarity of renewable generations and loads while minimizing the switching times simultaneously in the range of a full day. First, a multi-objective optimization model is constructed to minimize the weighted sum of voltage unbalance factors and the sum of number of switching actions in the day based on the power flow model. Second, a two-step solution strategy is proposed to solve the optimization model. Finally, the proposed strategy is validated using 11-node and 34-node distribution networks as case studies, and a switching and stabilizing device is designed to enable unified switching of renewable generations and loads. Numerical results demonstrate that the proposed strategy can effectively reduce the switching times without affecting the improvement of voltage balance.

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Section: A Indices and Sets I J K Qmentioning

confidence: 99%

Multi-objective Day-ahead Polarity Switching Optimization for Voltage Unbalance in Bipolar DC Distribution Networks

Huang¹,

Wang²,

Chen³

et al. 2023

Journal of Modern Power Systems and Clean Energy

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show abstract

“…In the two aforementioned methods, suppression of unbalanced voltage is accomplished through additional power electronics equipment and only the local voltage quality is guaranteed. Redistribution of unipolar loads in order to mitigate voltage imbalance can be achieved by a centralized control approach [8,16,17]. In this approach, a full communication channel is required to collect the required information from each node and sent them to the control center.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Due to the centralized communication infrastructure and additional switching devices, this approach is not sufficiently cost-effective [16]. Besides this, it is noteworthy that this method belongs to the energy management level rather than power management, which means the time scale in this method is large, and it cannot be implemented in the real-time microgrid operation [8,18].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The existing device-level solutions to mitigate voltage imbalance include: (i) employing a balancing power electronic blocks called voltage balancer (VB), (ii) installation of distributed DC electric springs (DC-ESs), and (iii) redistribution of unipolar loads. The VBs operate to make the positive pole voltage of the converter outlet equal to the negative pole voltage [8]. Different types of VB topologies and relevant control strategies have been proposed in previous studies [9][10][11][12][13].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The VBs operate to make the positive pole voltage of the converter outlet equal to the negative pole voltage [8]. Different types of VB topologies and relevant control strategies have been proposed in previous studies [9–13].…”

Section: Introductionmentioning

confidence: 99%

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A resilient bi‐level control strategy for power sharing and voltage balancing in bipolar DC microgrids

Babazadeh-Dizaji

Hamzeh

Dehkordi

2022

IET Generation Trans & Dist

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In the three‐level DC‐DC converter‐based bipolar DC microgrids, accurate power sharing among distributed generators and voltage balancing between the positive and negative poles are two main control objectives. This article presents a resilient bi‐level control strategy which simultaneously satisfies both aforementioned objectives. The proposed control structure is a combination of a distributed consensus‐based cooperative method and a washout filter‐based method. In the first level, a distributed consensus‐based cooperative control method with considering time delays and communication noises is developed to realize proportional power sharing. At this level, DGs operate collaboratively using only neighbour‐to‐neighbour feedback over a sparse communication network, even if the communication network is susceptible to additive noise and time delay. In the second level, a decentralized control method is employed to restore the voltage of each pole of a bipolar DC microgrid to the desired value. The second level, which works without any communication links and additional control loops, utilizes a dynamic feedback incorporating washout filters. The whole proposed control strategy is robust against a single point of link‐failure and resilient against the communication time delays and noises as well. Comprehensive simulation studies are carried out in PLECS software to verify the effectiveness of the proposed control scheme.

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Voltage unbalance mitigation with space vector-based PN-sequence control scheme of inverter-interfaced DGs considering demand-side management capability

Ali

Kumar

2023

Electr Eng

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Load-Switching Strategy for Voltage Balancing of Bipolar DC Distribution Networks Based on Optimal Automatic Commutation Algorithm

Cited by 21 publications

References 16 publications

Multi-objective Day-ahead Polarity Switching Optimization for Voltage Unbalance in Bipolar DC Distribution Networks

Multi-objective Day-ahead Polarity Switching Optimization for Voltage Unbalance in Bipolar DC Distribution Networks

A resilient bi‐level control strategy for power sharing and voltage balancing in bipolar DC microgrids

Voltage unbalance mitigation with space vector-based PN-sequence control scheme of inverter-interfaced DGs considering demand-side management capability

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