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Ruonan Hu
National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China

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Journal article
Published: 13 November 2020 in Sustainability
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This paper proposes a coordinated voltage regulation method for active distribution networks (ADNs) to mitigate nodal voltage fluctuations caused by photovoltaic (PV) power fluctuations, where a three-stage optimization scheme is developed to coordinate and optimize the tap position of on-load tap changers (OLTCs), the reactive power of capacitor banks (CBs), and the active and reactive power of soft open points (SOPs). The first stage aims to schedule the OLTC and CBs hourly using the rolling optimization algorithm. In the second stage, a multi-objective optimization model of SOPs is established to periodically (15 min) optimize the active and reactive power of each SOP. Meanwhile, this model is also responsible for optimizing the Q-V droop control parameters of each SOP used in the third stage. The aim of the third stage is to suppress real-time (1 min) voltage fluctuations caused by rapid changes in PV power, where the Q-V droop control is developed to regulate the actual reactive power of SOPs automatically, according to the measured voltage at the SOPs’ connection points. Furthermore, numerous simulations and comparisons are carried out on a modified IEEE 33-bus distribution network to verify the effectiveness and correctness of the proposed voltage regulation method.

ACS Style

Ruonan Hu; Wei Wang; Zhe Chen; Xuezhi Wu; Long Jing; Wei Ma; Guohong Zeng. Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points. Sustainability 2020, 12, 9453 .

AMA Style

Ruonan Hu, Wei Wang, Zhe Chen, Xuezhi Wu, Long Jing, Wei Ma, Guohong Zeng. Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points. Sustainability. 2020; 12 (22):9453.

Chicago/Turabian Style

Ruonan Hu; Wei Wang; Zhe Chen; Xuezhi Wu; Long Jing; Wei Ma; Guohong Zeng. 2020. "Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points." Sustainability 12, no. 22: 9453.

Journal article
Published: 03 March 2019 in Sustainability
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The power fluctuations of grid-connected photovoltaic (PV) systems have negative impacts on the power quality and stability of the utility grid. In this study, the combinations of a battery/supercapacitor hybrid energy storage system (HESS) and the PV power curtailment are used to smooth PV power fluctuations. A PV power curtailment algorithm is developed to limit PV power when power fluctuation exceeds the power capacity of the HESS. A multi-objective optimization model is established to dispatch the HESS power, considering energy losses and the state of charge (SOC) of the supercapacitor. To prevent the SOCs of the HESS from approaching their lower limits, a SOC correction strategy is proposed to correct the SOCs of the HESS. Moreover, this paper also investigates the performances (such as the smoothing effects, losses and lifetime of energy storage, and system net profits) of two different smoothing strategies, including the method of using the HESS and the proposed strategy. Finally, numerous simulations are carried out based on data obtained from a 750 kWp PV plant. Simulation results indicate that the proposed method is more economical and can effectively smooth power fluctuations compared with the method of using the HESS.

ACS Style

Wei Ma; Wei Wang; Xuezhi Wu; Ruonan Hu; Fen Tang; Weige Zhang. Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment. Sustainability 2019, 11, 1324 .

AMA Style

Wei Ma, Wei Wang, Xuezhi Wu, Ruonan Hu, Fen Tang, Weige Zhang. Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment. Sustainability. 2019; 11 (5):1324.

Chicago/Turabian Style

Wei Ma; Wei Wang; Xuezhi Wu; Ruonan Hu; Fen Tang; Weige Zhang. 2019. "Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment." Sustainability 11, no. 5: 1324.