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- 저자 : Zuo-min Shao (검색결과 3 건)
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Research on Control Strategy of Hybrid Energy Storage System with Optical Storage Microgrid
Zhu Zuo-Bin,Sun Shu-Min,Ding Yue-Ming,Huang Shao-Ping 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
With the aim of improving the robustness of the hybrid energy storage system(HESS) and avoiding overcharging and reasonably managing state of charge (SOC), this paper proposed a HESS control strategy employing integral backstepping (IBS) method based on SOC. Firstly, on the basis of the hybrid energy storage control strategy of conventional filtering technology (FT), the current inner loop PI controller was changed into an controller employing IBS method to improve the robustness shown by the energy storage system (ESS) against system parameter perturbation or external disturbance. The current controller of the HESS employing inner loop integral backstepping method was designed and the Lyapunov stability was proven. Secondly, to avoid overcharging and over-discharging of the HESS and to reasonably manage SOC, an energy management strategy based on SOC was proposed to generate the current reference value of the inner loop controller employing integral backstepping method, and the energy management strategy based on SOC was designed as well. Finally, the simulation model of the HESS employing integrated backstepping method based on SOC was established, and the feasibility of this method was verified through simulation. It was shown by the results obtained from the simulation that the HESS control strategy employing integrated backstepping method based on SOC had greater anti-interference ability and improved the robustness of the system, in comparison with the control strategy of FT (PI) and FT (IBS) hybrid energy storage. In the meanwhile, the upper and lower limits of SOC of the ESS are supposed to be managed to avoid overcharging and over-discharging and to extend the life of the ESS.
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Bin Zhu-Zuo,Min Sun-Shu,Yuan Liu-Yi,Ping Huang-Shao 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
A large proportion of renewable energy is integrated into power system, resulting in the gradual electrifi cation of the power system and appearing the characteristics of a weak power grid. Under weak grid, current source virtual synchronous generator (VSG) is prone to resonance. To ensure stable and uninterrupted operation of renewable energy through power electronic devices connected to grid, this paper proposes a composite control method based on grid voltage feedforward (GVF) and q-axis impedance reshaping (QAIR) for current source VSG converter resonance suppression. Firstly, sequence impedance modeling (SIM) and stability analysis are conducted on current source VSG converter. Under weak grid, the negative resistance eff ect caused by phase-locked loop (PLL) in the low frequency range makes system unstable in grid connection. To eliminate the negative resistance instability caused by PLL, a current source VSG GVF control resonance suppression method is established. SIM of this method and stability analysis are conducted. Secondly, a QAIR resonance suppression method for current source VSG converter is established. SIM of the method is conducted and stability analyzed. On the basis of above two methods, a composite resonance suppression method based on GVF and QAIR is established, and SIM and stability analysis are conducted. Simulation and experimental tests are conducted on the stability of GVF, QAIR, and GVF + QAIR composite resonance suppression current type VSG systems. The test results showed that the method based on GVF + QAIR resonance suppression is more eff ective, compared to GVF/QAIR resonance suppression method. Under weak grid, it has better ability to eliminate negative resistance eff ects and harmonic suppression caused by PLL, further improving grid-connected stability.
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