Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters

Load Sharing Scheme Incorporating Power Security Margins for Parallel Operation of Voltage Source Inverters
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DOI：
10.3390/en14185825
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发表时间：
2021-09
期刊：
Energies
影响因子：
3.2
通讯作者：
Chiebuka Eyisi;Qifeng Li
Chiebuka Eyisi;Qifeng Li
中科院分区：
工程技术4区
文献类型：
--
作者：
Chiebuka Eyisi;Qifeng Li

文献摘要

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分布式能源（DER）在孤岛和并网模式下运行的微电网（MG）的互联需要协调控制策略。DER与电压源逆变器（VSI）接口，从而实现互连。提出了一种基于电压源逆变器的孤岛型微网（VSI-MG）中多个逆变器并联运行的负荷需求分配方案。本文研究了一个重负载的VSI-MG的穿越能力，其中一些VSI由于事件的发生而满载。在开发分析方程模型的VSI，虚拟同步机（VSM）的概念被应用到使VSI模仿同步机的惯性效应。功率帧变换（PFT），考虑MG网络的线路比率也被纳入，以产生满意的网络频率和MG网络中的母线电压的瞬态响应。然后，开发了一种基于雅可比的方法，以考虑VSI-MG中每个VSI的运行能力。当事件发生时，所得到的可调下垂控制将VSI约束在其功率能力内。内提出的仿真结果表明，所提出的程序，具有很大的潜力，以促进努力保持系统的可靠性和弹性的有效性。
The interconnection of distributed energy resources (DERs) in microgrids (MGs) operating in both islanded and grid-connected modes require coordinated control strategies. DERs are interfaced with voltage source inverters (VSIs) enabling interconnection. This paper proposes a load demand sharing scheme for the parallel operation of VSIs in an islanded voltage source inverter-based microgrid (VSI-MG). The ride-through capability of a heavily loaded VSI-MG, where some of the VSIs are fully loaded due to the occurrence of an event is investigated. In developing analytical equations to model the VSI, the concept of virtual synchronous machines (VSM) is applied to enable the VSI mimic the inertia effect of synchronous machines. A power frame transformation (PFT) that takes the line ratios of the MG network into account is also incorporated to yield satisfactory transient responses of both network frequency and bus voltages in the MG network. A Jacobian-based method is then developed to take into account the operational capacity of each VSI in the VSI-MG. The resulting amendable droop control constrains the VSIs within their power capabilities when an event occurs. Simulation results presented within demonstrate the effectiveness of the proposed procedure which has great potential to facilitate efforts in maintaining system reliability and resiliency.