Small-Signal Stability Analysis of the Standalone Single-Phase Parallel Inverter with BPF-based Droop Control Scheme

Mengling Yang, Congling Wang, Yang Han, Jingqi Xiong, Ping Yang
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引用次数: 7

Abstract

As a supplementary part of the droop control, the secondary control is widely utilized in the control of the microgrid, however, its reliability is susceptible due to the possible communication delay and data drop-out. In our recent work, the steady-state amplitude and frequency deviation of voltage can be restored by using the band-pass filter (BPF)-based improved droop control, without any communication links and additional control loop. In this paper, the BPF-based improved droop control is first employed for the two parallel-connected islanded inverters, and its small-signal model is derived in this case. Furthermore, the impact of the active power droop coefficient, the cutoff frequency of high-pass filter and the load impedance on system stability and dynamic performance are further analyzed based on the established model. Finally, the stability and dynamic response performance of the system under different control parameters is compared by simulation in PLECS software, which validates the effectiveness of this method in single-phase inverter system and the derived small-signal model.
基于bpf下垂控制方案的独立单相并联逆变器的小信号稳定性分析
二次控制作为下垂控制的补充部分,在微电网的控制中得到了广泛的应用,但由于可能存在通信延迟和数据丢失,其可靠性受到影响。在我们最近的工作中,使用基于带通滤波器(BPF)的改进下垂控制可以恢复电压的稳态幅值和频率偏差,而不需要任何通信链路和额外的控制回路。本文首先将基于bpf的改进下垂控制应用于两个并联孤岛逆变器,并在此情况下推导了其小信号模型。在此基础上,进一步分析了有功功率下垂系数、高通滤波器截止频率和负载阻抗对系统稳定性和动态性能的影响。最后,在PLECS软件中通过仿真比较了系统在不同控制参数下的稳定性和动态响应性能,验证了该方法在单相逆变系统和推导的小信号模型中的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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