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首页> 外文期刊>Electric power systems research >Modeling and control of quasi Z-source inverters for parallel operation of battery energy storage systems: Application to microgrids
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Modeling and control of quasi Z-source inverters for parallel operation of battery energy storage systems: Application to microgrids

机译：电池储能系统并联运行的准Z源逆变器的建模和控制：在微电网上的应用

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摘要

In this paper, a quasi Z-source Inverter (qZSI) is presented for the application in parallel operation of Battery Energy Storage Systems (BESSs) in microgrids. The qZSI is a single stage converter with two controllable DC ports. In the proposed control method to parallel battery stacks, in islanded mode of microgrid operation, the BESS supplies the load power, while the shoot-through duty cycle of inverter legs is utilized to fulfill the current sharing between the battery systems with different voltage and power ratings. In this mode, the inverter modulation index is used to control the microgrid voltage while other distributed energy resources (DERs) operate in power control mode. Furthermore, thanks to the proposed current sharing method, the oscillatory power due to the unbalanced loads is also appropriately shared between the battery systems. In the grid-connected mode of operation in which the microgrid voltage is dictated by the main grid, the current of each battery system can be independently regulated by adjusting the inverter modulation index and the shoot-through duty cycle. The performance of the proposed control strategy in both charging and discharging modes of the BESS operating in the grid-connected mode is evaluated. Moreover, in the islanded mode, the suitability of the proposed method for current sharing between the battery systems is investigated. Simulations are conducted in MATLAB/Simulink for the case of a typical microgrid involving two battery systems characterized by different current and voltage ratings. (C) 2015 Elsevier B.V. All rights reserved.
机译：本文提出了一种准Z源逆变器（qZSI），用于微电网中电池储能系统（BESS）的并联运行。 qZSI是具有两个可控DC端口的单级转换器。在提出的并联电池组控制方法中，在微电网运行的孤岛模式下，BESS提供负载功率，而逆变器支路的直通占空比用于满足不同电压和功率的电池系统之间的电流共享。评级。在此模式下，逆变器调制指数用于控制微电网电压，而其他分布式能源（DER）在功率控制模式下运行。此外，由于提出了电流共享方法，由不平衡负载引起的振荡功率也可以在电池系统之间适当地共享。在主电网决定微电网电压的并网运行模式中，可以通过调节逆变器调制指数和直通占空比来独立调节每个电池系统的电流。评价了在并网模式下运行的BESS的充电和放电模式下所提出的控制策略的性能。此外，在孤岛模式下，研究了所提出的方法在电池系统之间共享电流的适用性。对于典型的微电网，其中涉及两个以不同的额定电流和电压为特征的电池系统，在MATLAB / Simulink中进行了仿真。 （C）2015 Elsevier B.V.保留所有权利。

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