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- 저자 : Sucheng Liu (검색결과 3 건)
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Research On A Flexible Waveform Power Amplifier Adopting Switch-Linear Hybrid(SLH) Scheme
Xiaodong Liu,Sucheng Liu,Lusheng Ge 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A novel power amplifier adopting Switch-Linear Hybrid Scheme (SLH-FWPA) is introduced to accomplish flexible waveforms power amplification in a high bandwidth at high output power rating. The final output stage of SLH-FWPA is derived from linear power amplifier architecture to maintain excellent output quality and well dynamic performance; and meanwhile using tracking power supplies for the linear output stage to acquire total system efficiency above 80% generally. Theoretic analysis for SLH-FWPA is given and experimental results verify the implementation of SLH-FWPA.
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Control stability of inverters with series‑compensated transmission lines: analysis and improvement
Qianjin Zhang,Jinhui Qian,Zhaorong Zhai,Xiaodong Liu,Sucheng Liu,Wei Fang,Hongbo Liu,Mohammad Abusara 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
With the rapid development of renewable energy, large amounts of power need to be transmitted to load centers, and seriescapacitor compensation (SCC) plays an important role in renewable power transmission. However, it has been pointed out that SCC interacts with inverters and threatens system stability. This paper investigates the influence of SCC on inverter control, and proposes strategies for enhancing system stability based on the instability mechanism. First, the impacts of SCC on inverter current control and synchronization control are analyzed. A current control model is established by a system transfer function, and a synchronization control model focusing on transient stability is established based on the traditional synchronous reference frame phase-locked loop (SRF-PLL). Bode and nonlinear analysis methods are utilized in the stability analysis of both current control and synchronization control. It is found that SCC has little effect on inverter current control. However, it seriously affects synchronization control. SCC reduces the stability range of synchronization control, and causes system instability when there is a large frequency disturbance. In order to improve system stability, two approaches have been proposed. These approaches are optimizing a PI controller, and designing a band-pass filter (BPF) inside the PLL. Finally, simulations and experiments are presented to verify the correctness of theories.
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SoC balancing method for energy storage systems in DC microgrids using simplified droop control
Qi, Nan,Fang, Wei,Wang, Wei,Liu, Xiaodong,Liu, Sucheng The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8
DC microgrids adopt energy storage units to maintain the dynamic power balance between distributed power systems and the load. For DC microgrids in small-scale applications including residential microgrids, to ensure the coordination of the state of charge (SoC) and load current sharing among each of the energy storage units, an improved SoC-balanced control method without interconnection communication is proposed in this paper. The proposed method applies an adaptive droop control expression with a specific SoC-function to regulate its reference voltage in both the charging and discharging processes of the energy storage units. Thus, the balance of the SoC and the load current is achieved autonomously. This method can reduce the bus voltage deviation and weaken the impact of the output current on the bus voltage variation, especially for low-voltage DC microgrids. Moreover, the sampling of the output current is avoided, and both the cost and complexity of controller design are significantly reduced. In addition, a function curves analysis method is proposed to analyze the speed of the SoC balancing and the DC bus voltage deviation, which gives instruction in the choice of the adjustment factor in the adaptive droop equation. A mathematical description of the operating process and a small signal model of the proposed method are established to evaluate the system feasibility and stability. A laboratory-scale DC microgrid is built to verify the proposed method. Finally, simulation and experimental results are presented.
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