http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Battery Energy Storage System with Energy Spring Based on VS G Control Strategy
Yuting Shao,Ranchen Yang,Xin Li,Guozhu Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
To solve the problem of small capacity and low voltage level of the traditional battery energy storage system (BESS), a single-stage cascaded H-bridge with energy spring (ES) which can eliminate the secondary pulsating current injecting into the battery is proposed in this paper. In addition, the virtual synchronous generator (VSG) control strategy is adopted for the grid-friendly integration of the BESS. The VSG control strategy is analyzed and optimized to achieve seamless grid connection and improve the dynamic performance of reactive power. The experimental results demonstrate the correctness and effectiveness of the proposed topology and control strategy.
Current Harmonic Suppression for Gridconnected VSG Based on Virtual HarmonicImpedance
Yaowei Hu,Yuting Shao,Ranchen Yang,Guozhu Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
When the inverter controlled as a virtual synchronous generator (VSG) is connected to the non-ideal grid, the grid current will be severely distorted, especially when the line impedance is relatively small. However, the commonly used voltage-type VSG at present cannot directly control the output current of the VSG. Thus, this paper presented a method of harmonic suppression based on the virtual harmonic impedance (VHI). By introducing the VHI to the voltage-current dual loop, the equivalent virtual resistor and inductor of each harmonic can be configured independently according to the actual situation. Accordingly, the attenuation ratio of each harmonic current can be adjusted equivalently. The effectiveness of the VHI are verified by simulation.