2018创新智能电网会议报告-中南大学信息科学与工程学院门户网站

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2018创新智能电网会议报告

来源: 点击: 时间: 2018年05月29日 10:37

会议名称:2018创新智能电网会议(Innovative Smart Grid Technologies)

报告时间:2018年5月29日(星期二)晚上7:00

报告地点:校本部民主楼306-1

报告人:侯小超

报告题目:A Flexible Quasi-droop Control Scheme of Interlinking Converter in Hybrid ACDC Microgrid

报告摘要:In hybrid microgrid, interlinking converter (ILC) is a key component to connect the AC subgrid and DC subgrid. Its control strategy significantly affect the power flow management, power quality, system efficiency and stability. Traditionally, ILC is usually controlled as a current source, resulting in a poor dynamic stability when a remote weak AC subgird is connected by a large linking impedance. In this study, a quasi-droop control scheme is proposed to control ILC as a current controlled voltage source (CCVS). Not only a flexible power flow management is achieved, but an ancillary function of voltage support is also provided. Moreover, this simple quasi-droop control enables ILC to synchronize with the AC subgrid autonomouslywithout a phase-locked loop (PLL). Finally, simulations are presented to verify the system effectiveness.

会议名称:2018创新智能电网会议(Innovative Smart Grid Technologies)

报告时间:2018年5月29日(星期二)晚上8:00

报告地点:校本部民主楼306-1

报告人:罗超

报告题目:A Decentralized Power Control of Cascaded Single-Stage PV Inverters for Grid-connected Applications

报告摘要:To facilitate the integration of low voltage photovoltaic (PV) generators into the grid and achieve high efficiency, this paper presents a grid-connected cascaded single-stage PV inverter system and a fully decentralized power control is proposed accordingly. In this system configuration, input port of each single-stage PV inverter is tied directly to its local PV panels and their output ports are connected in series to be integrated into the utility grid. Thus, a high step-up conversion stage is not needed and high efficiency as well as reduced cost are realized. The proposed decentralized power control requires no communication facilities and thus features high reliability. With the proposed control, each cascaded inverter is controlled as a voltage source independently and locally to realize maximum power point tracking (MPPT) and frequency synchronization with the utility grid autonomously without a phase-locked loop (PLL), which ensures supplying the maximum active power available to the utility grid. The system stability is evaluated by small-signal stability analysis. Simulation test verifies the effectiveness and correctness of the proposed control.


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