会议名称：IEEE SPEC 2018
全称：第四届IEEE南方电力电子大会(4TH IEEE SOUTHERN POWER ELECTRONICS CONFERENCE)
报告题目：An Integrated Series-Parallel Microgrid Structure and its Unified Distributed Control.（葛小海）
报告摘要：This paper presents an integrated series-parallel microgrid(MG), where a few distributed generation(DG) units in series type are used to form a DG string, then DG strings supply power to the common load in parallel type. With this structure, low-voltage devices could be integrated into MG without DC-DC boost converters. It provides a more flexible and efficient way to form higher voltage level MG. But it is difficult to find a decentralized control method to achieve power balance for this integrated system because of the difference between power transmission characteristics of parallel and series converter system. For this proposed MG in island mode, a unified distributed control strategy is proposed. With low bandwidth communication, accurate power sharing can be realized by exchanging information between the first converters connected to the bus of adjacent DG strings and between adjacent converters inside each DG string. Because the central controller is not used, the communication pressure of the system is reduced and the reliability is guaranteed. Simulation test has verified the feasibility and validity of the proposed control strategy.
报告题目：A Min-communication Control for Grid-connected Cascaded PV Inverters.（刘宏毅）
报告摘要: A minimize communication control method is proposed for photovoltaic (PV) grid-connected systems with cascaded H-bridge inverters. In the system used in this paper, PV panel in each unit is directly connected to the input port of the local H-bridge, then the output ports of these H-bridge inverters are cascaded with each other, each PV unit works at its maximum power point (MPP) to guarantee system’s maximum power generation efficiency. With communication, the inverter that connect to the point of common coupling (PCC) is controlled as a current source to keep synchronous operation with the utility grid by regulating its output current in phase with the grid voltage. The other cascaded inverters are controlled as voltage resources and keeping self-synchronization with unity power factor (PF) by the proposed control method without any communication. Finally, the common link current drives all cascaded inverters keep self-synchronization with the grid and provide maximum power with high quality to the grid. Compare with other control methods, the proposed control method only requires one communication link, the communication cost is effectively reduced, the reliability and power quality of the system are greatly improved. Simulation test verifies the correctness and validity of the proposed control strategy.
报告题目：A unified distributed control scheme on cost optimization for hybrid AC/DC microgrid.（冯文栋）
报告摘要：This paper presents a unified distributed control scheme for hybrid AC/DC microgrid to realize the economic operation of system. The existing researches on distributed optimization are purely focused on the DC or AC microgrid environment, and the research on the economic optimization of hybrid microgrid containing AC and DC subgrid has not been further studied. In this paper, a unified distributed optimization strategy for hybrid microgrid based on the equal incremental cost(IC) principle is proposed. The control strategy proposed in this paper can be divided into two parts. For the first part, ICs of the sources reach consensus through the distributed protocol in a single AC subgrid or DC subgrid, and the average voltage recovery is achieved by building a voltage observer in every source. For the second part, by using PI controller, the reference power of the bidirectional dc-ac interlinking converter is easily defined and the global incremental costs are finally equalized according to the respective distributed protocols. Thus the generation cost is optimized. Feasibility and effectiveness of proposed method are verified by simulation in Matlab/Simulink environment.
报告题目：Commutation Torque Ripple Reduction for Brushless DC Motors Based on Optimal Control.（梁健）
报告摘要：A method based on optimal control is proposed to reduce the commutation torque ripple of brushless dc motors (BLDCMs) in this paper. The theoretical background on optimal control and its design process when applied to BLDCM for commutation torque ripple reduction are given. According to the proposed method, the optimal switching state is selected and applied in the commutation period directly, which makes the non-commutated phase currents stable. Therefore, the commutation torque ripple of the BLDCM is reduced. Simulation results show the effectiveness of the proposed strategy in both high-speed and low-speed conditions as compared to that of the conventional control method.
报告题目：Comparative Analysis of LCL, LCLC, CLLC Compensation Networks for Capacitive Power Transfer（宁思捷）
报告摘要：This paper discusses three compensation networks that are suitable for use in Capacitive Power Transfer (CPT) applications. Inductor/capacitor/inductor(LCL), inductor/capacity or/inductor/capacitor (LCLC) and capacitor/inductor/inductor /capacitor(CLLC) compensation networks are investigated. Equivalent circuit models are used to describe each circuit topology. In this paper, expressions of the voltage gain and output power of three compensation networks are derived in detail without equivalent series resistors (ESR) taken into account. The comparison results of system performance variation including maximum voltage gain are shown with discussion as well. This paper provides a comparative analysis for researchers in CPT system.