LoRa传输延迟对独立直流微电网动态性能的影响分析

Q4 Energy
Cherechi Ndukwe, M. Iqbal, Jahangir Khan, M. Jamil
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引用次数: 1

摘要

实现基于通信的可控微电网正常稳定运行的一个重要方面是数据传输。因此,分析数据传输延迟的影响对任何选择的通信协议都是有意义的。本文主要研究了在独立直流微电网二级控制层采用LoRa进行数据传输的效果。分析了LoRa传输延迟对直流微电网动态性能的影响。本文模拟了一个社区直流微电网,该微电网在三种模式下运行:光伏模式、电池模式和发电机模式。该微电网作为基于集中通信的受控微电网运行,二级控制级别作为事件驱动级别运行。该系统包含一个分层系统,其中数据在各种分布式能源(DERs)本地控制器和微电网中央控制器(MGCC)之间传输。给出了三种场景的仿真。在第一种情况下,微电网的设计和模拟没有通信延迟,以观察系统的行为。然后计算MGCC与本地控制器之间传输的各种信号的LoRa传输延迟。这种延迟作为传输延迟引入到仿真中,系统表现出一定程度的稳定性退化。随后,在系统中加入了时滞补偿系统,以提高系统的鲁棒性。在两种仿真场景中应用了延迟补偿。在第一种情况下,重新计算系统电感(L)和电容(C)元件,并对系统进行重新仿真,使系统在施加通信延迟的情况下保持稳定。在第二种情况下,将微电网中央控制器中的比例积分器(PI)控制器重新设计为更鲁棒的形式,以补偿LoRa传输引起的延迟。两种修正的仿真结果实现了稳定的直流微电网。这种系统修改允许系统再次稳定,类似于微电网在没有任何通信延迟的情况下运行的模拟。因此,这表明,通过适当的系统设计和实现,LoRa等低带宽通信系统可以有效地用于基于事件驱动通信的受控直流微电网中的数据传输。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of LoRa Transmission Delay on Dynamic Performance of Standalone DC Microgrids
One important aspect toward proper and stable functioning of a communication-based controlled microgrid is data transmission. Consequently, an analysis of the effect of data transmission delay is of significance for any chosen communication protocol. This paper focuses on the effect of employing LoRa for data transfer at the secondary control level of a standalone DC microgrid. It analyses the effect of LoRa transmission delay on the dynamic performance of DC microgrids. This paper simulates a community DC microgrid that operates in three modes: PV mode, battery mode and generator mode. This microgrid operates as a centralized communication-based controlled microgrid, with the secondary control level operating as an event-driven level. The system incorporates a hierarchical system where data is transferred between the various distributed energy resources (DERs) local controllers and the microgrid central controller (MGCC). Simulations for three scenarios are presented. In the first scenario, the microgrid is designed and simulated without a communication delay to observe the system behavior. Then LoRa transmission delay is calculated for the various signals transferred between the MGCC and the local controllers. This delay is introduced into the simulation as transport delays and the system exhibits a level of stability degradation. Subsequently, a time delay compensation system is incorporated into the system for more robust operation. The delay compensation is applied in two simulation scenarios. In the first scenario, the system inductor (L) and capacitor (C) components are re-calculated, and the system is re-simulated to get a stable system even with the applied communication delay. In the second scenario, the proportional integrator (PI) controller in the microgrid central controller is re-designed to a more robust form to compensate for the delay caused by the LoRa transmission. The results obtained from the two modified simulations realize a stable DC microgrid. This system modification allows for system stability again, similar to the simulation when the microgrid operated without any communication delay. This, therefore, demonstrates that with proper system design and implementation, low bandwidth communication systems such as LoRa can be effectively employed for data transfer in event-driven communication-based controlled DC microgrids.
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来源期刊
Journal of Nuclear Energy Science and Power Generation Technology
Journal of Nuclear Energy Science and Power Generation Technology Energy-Energy Engineering and Power Technology
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