Impedance-Based Local Stability Criterion for DC Distributed Power Systems

Impedance-Based Local Stability Criterion for DC Distributed Power Systems
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直流分布式电力系统基于阻抗的局部稳定性准则

DOI:
10.1109/tcsi.2014.2373673
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发表时间:
2015-01
影响因子:
5.1
通讯作者:
Tse, Chi K.
Tse, Chi K.
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang, Xin;Ruan, Xinbo;Tse, Chi K.

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本文研究了直流分布式电源系统的稳定性问题。基于阻抗的方法是电压源系统和电流源系统稳定性评估的有效方法。然而,这些方法可能不适用于涉及实际参数,负载条件,系统的结构和操作模式的变化的应用。因此,对于不类似于简单的电压源系统或电流源系统的系统,稳定性评估要容易得多。本文提出了一种基于阻抗的直流DPS稳定性评估准则。我们首先将直流DPS中的任何转换器分类为总线电压控制转换器(BVCC)或总线电流控制转换器(BCCC)。因此,无论其结构和工作模式如何,直流DPS都可以用一般形式表示。然后,使用二端口小信号模型精确地推导出标准直流DPS的小环路增益。应用奈奎斯特准则推导出的小回路增益给出了直流DPS的稳定性要求。无论控制方法和连接配置如何,该拟议标准均适用于直流DPS。最后,一个480 W的光伏(PV)系统与电池能量存储和200 W的直流DPS,其中的源转换器采用下垂控制,制造,以验证所提出的标准的有效性。
This paper addresses the stability issue of dc distributed power systems (DPS). Impedance-based methods are effective for stability assessment of voltage-source systems and current-source systems. However, these methods may not be suitable for applications involving variation of practical parameters, loading conditions, system's structures, and operating modes. Thus, for systems that do not resemble simple voltage-source systems or current-source systems, stability assessment is much less readily performed. This paper proposes an impedance-based criterion for stability assessment of dc DPS. We first classify any converter in a dc DPS as either a bus voltage controlled converter (BVCC) or a bus current controlled converter (BCCC). As a result, a dc DPS can be represented in a general form regardless of its structure and operating mode. Then, the minor loop gain of the standard dc DPS is derived precisely using a two-port small signal model. Application of the Nyquist criterion on the derived minor loop gain gives the stability requirement for the dc DPS. This proposed criterion is applicable to dc DPSs, regardless of the control method and the connection configuration. Finally, a 480 W photovoltaic (PV) system with battery energy storage and a 200 W dc DPS, in which the source converter employs a droop control, are fabricated to validate the effectiveness of the proposed criterion.
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