不平衡电网条件下直流微电网中基于虚拟滤波器的并网变流器稳定性增强控制装置

IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
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引用次数: 0

摘要

直流微电网被认为是智能电网技术的基石,但由于大量引入电力电子设备,直流微电网存在小信号不稳定性问题。因此,本文首先开发了一种序列虚拟滤波器(VF)控制器,与虚拟阻抗(VI)控制器相比,它不仅考虑了纵向虚拟参数,还考虑了横向电容和电阻,从而提高了系统稳定性调整的灵活性。然后,由于配电馈线通常是不平衡的,应用所提出的序列 VF 控制器可能会放大不平衡对直流电压的畸变,因此为并网逆变器(GCC)提出了一种考虑到 VF 控制器的新型参考电流生成(RCG)策略,以改善直流微电网的电能质量。PSCAD 仿真结果表明,序列 VF 控制器可增强稳定性调节,因为在某些情况下,只有通过调整横向参数才能稳定系统。另一方面,与传统方法相比,建议的 RCG 策略能显著减少直流电压波动。此外,在基于主从式直流微电网中,建议的策略与序列变频控制器相结合,在减少负序电流方面具有更大的灵活性,同时还能保持 GCC 的功率传输能力,与传统策略不相上下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A virtual-filter-based stability enhancement control for grid-connected converter in DC microgrids under unbalanced grid conditions

DC microgrids, considered building blocks of smart grid technologies, are subjected to small-signal instability due to the extensive introduction of power electronics devices. Therefore, in this paper, a sequence Virtual Filter (VF) controller, which considers not only the longitudinal virtual parameters but also the lateral capacitance and resistance, is first developed to increase the flexibility of system stability adjustment compared to the Virtual Impedance (VI) controller. Then, as distribution feeders are normally unbalanced and the application of the proposed sequence VF controller may amplify the distortion of imbalances on DC voltage, a novel Reference Current Generation (RCG) strategy considering the VF controller is proposed for Grid-Connected Converter (GCC) to improve DC microgrid power quality. The double-frequency fluctuation of the DC-link voltage is eliminated by regulating the oscillation of the active power flowing into the converter instead of the Point of Common Coupling (PCC) to 0. The PSCAD simulation results illustrate that the sequence VF controller can enhance the stability adjustment since, in some cases, the system can only be stabilized by adjusting lateral parameters. On the other hand, the proposed RCG strategy can significantly reduce DC voltage fluctuations compared to the traditional approach. Furthermore, incorporating the proposed strategy with the sequence VF controller offers greater flexibility in reducing the negative-sequence current while maintaining a power transfer capacity for GCCs in a master–slave-based DC microgrid, comparable to that of the traditional strategy.

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来源期刊
International Journal of Electrical Power & Energy Systems
International Journal of Electrical Power & Energy Systems 工程技术-工程:电子与电气
CiteScore
12.10
自引率
17.30%
发文量
1022
审稿时长
51 days
期刊介绍: The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.
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