Article
Energy & Fuels
Qingzhu Wan, Shuai Zheng
Summary: A distributed cooperative secondary control strategy is proposed in this paper to overcome the drawbacks of bus voltage deviation and current sharing accuracy degradation caused by conventional v-i droop control in the primary control of a DC microgrid. The strategy utilizes discrete consensus and data exchange among converters to dynamically track the output voltage and current, while introducing a consistency gain function to reduce the impact of communication noise on control accuracy.
Article
Energy & Fuels
Shuo Liu, Honghao You, Jianlin Li, Shanjin Kai, Liyong Yang
Summary: A new distributed secondary control scheme based on LADRC is proposed in this paper to improve current sharing accuracy in DC microgrid by compensating voltage and current with LADRC controllers. The performance of the proposed control scheme in the frequency domain is analyzed and the effectiveness of the method is verified through simulation and experimental results.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2021)
Article
Engineering, Electrical & Electronic
Biks Alebachew Taye, Nalin Behari Dev Choudhury
Summary: Equal load sharing and maintaining constant DC bus voltage are the main challenges in DC microgrids. The droop control method is effective but has conflicting goals of accurate current sharing and voltage regulation. This paper proposes a new droop control algorithm that updates the droop resistance value based on load demand to improve sharing and regulation. The effectiveness of this method is evaluated using simulation and experimental studies.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Jiahao Wu, Yan Xing, Meng Song, Yihang Jia, Xin Jin, Xinyu Xu, Hongfei Wu
Summary: This article investigates an autonomous voltage control strategy for IPOS dc power system and proposes an autonomous voltage control strategy with power-ripple-based low bandwidth communication (LBC) to improve voltage regulation accuracy.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Energy & Fuels
Spyridon Chapaloglou, Babak Abdolmaleki, Elisabetta Tedeschi
Summary: With the increasing penetration of renewable energy and energy storage, converter-connected devices will dominate the next generation of power grids. DC microgrids are considered an attractive alternative due to the transition to non-synchronous grids and loads connected via power electronics. This paper proposes an optimal power sharing scheme using a droop-based decentralized control to achieve voltage regulation, and an integer optimization approach to determine the optimal converter size and location for safe and optimal operation. Time-domain simulations validate the approach's robustness to generator availability uncertainty.
Article
Engineering, Electrical & Electronic
Ramin Babazadeh-Dizaji, Mohsen Hamzeh, Nima Mahdian Dehkordi
Summary: A bi-level control strategy is proposed in this article for accurate power sharing and voltage balancing in bipolar DC microgrids. The proposed method considers the effects of communication noise and time delays, and exhibits robustness against single point of link-failure. Simulation studies validate the effectiveness of the proposed control scheme.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2022)
Article
Energy & Fuels
Alexander Paul Moya, Polo Josue Pazmino, Jacqueline Rosario Llanos, Diego Ortiz-Villalba, Claudio Burgos
Summary: This research presents the design and simulation of a distributed secondary control based on a consensus algorithm for the efficient management of an isolated DC microgrid, ensuring the distribution of active power according to the capacities of each storage unit, reducing duty cycles, and extending its life cycle.
Article
Green & Sustainable Science & Technology
Ahmed Rashwan, Alexey Mikhaylov, Tomonobu Senjyu, Mahdiyeh Eslami, Ashraf M. Hemeida, Dina S. M. Osheba
Summary: This paper presents an innovative solution to the challenge of achieving fast power sharing and stable performance in isolated microgrid (IMG) power systems. The proposed modified droop control effectively dampens low-frequency oscillations, even at higher gain values, improving stability and power sharing. The effectiveness of the proposed controller is validated through time domain simulation analysis, demonstrating significant improvement in system performance.
Article
Engineering, Electrical & Electronic
Shengqing Li, Shi Yan, Jian Zheng, Na Deng
Summary: A control strategy for automatically regulating the droop coefficient is proposed to address the issue of active power distribution error caused by the difference in output line impedance of parallel inverters in island photovoltaic microgrid. The strategy utilizes active power and reactive power as feedback values and employs reactive power disturbance to compute the sharing error of active power, achieving automatic regulation of the droop coefficient and significantly improving the accuracy of active power sharing.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Zhongwen Li, Zhiping Cheng, Jikai Si, Shuhui Li
Summary: This paper proposes a novel distributed event-triggered secondary control method for overcoming the drawbacks of primary control in direct current microgrids. The proposed method achieves system-wide control of parallel distributed generators, estimating and regulating the average bus voltage at the nominal value, and achieving accurate current sharing among the generators. The method is flexible and scalable, with a simple event-triggered condition that reduces the communication burden.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2022)
Article
Engineering, Electrical & Electronic
Mitra Nabian Dehaghani, Seyed Abbas Taher, Zahra Dehghani Arani
Summary: This article explores power control strategies in islanded hybrid AC/DC microgrids, including coordinated power control schemes for bidirectional converters and secondary control methods based on distributed cooperative control to achieve orderly power sharing and voltage regulation between AC and DC subgrids.
INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS
(2021)
Article
Green & Sustainable Science & Technology
Jinghang Lu, Xingyu Zhang, Bingfu Zhang, Xiaochao Hou, Peng Wang
Summary: A distributed dynamic event-triggered control method is proposed in this paper to solve the problem of simultaneous DC bus voltage recovery and current sharing in islanded DC microgrids. This control scheme can ensure DC bus voltage deviation removal and achieve current sharing among distributed generation units without requiring global information. The method involves data of neighboring DGs only at event-triggered times, reducing the communication burden of the DC microgrid network. The stability of the proposed method is demonstrated using the Lyapunov function and Zeno behavior is excluded. Experimental results with four case studies validate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2022)
Article
Computer Science, Information Systems
Hongjun Wang, Wanfeng Li, Youjun Yue, Hui Zhao
Summary: This paper proposes a new double-layer droop control mode for island AC/DC microgrids to achieve autonomous and cost-effective operation. The combination of optimal power reference iterative algorithm and secondary frequency and voltage adjustments enables global economic operation of the microgrid, as well as voltage following and frequency regulation in the subnet.
Article
Automation & Control Systems
Yu Zhang, Yan-Wu Wang, Jiang-Wen Xiao, Xiao-Kang Liu
Summary: A new predefined-time secondary controller is proposed for DC microgrid in this article to achieve the objectives of both voltage regulation and current sharing. The controller shows advantages such as fast convergence rate and small overshoot.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Energy & Fuels
Huan Pan, Xiao Feng, Feng Li, Jing Yang
Summary: This paper investigates the energy coordination control strategy for the standalone DC microgrid integrated with PV, energy storage, and EV charging. The simulation results show that the proposed coordination control strategy can effectively improve the stability of the DC microgrid system and reduce energy storage capacity redundancy.
