Generic Stability Impedance Criterion for the Parallel Inverters System

Xin Zhang, Jinsong He, Chung, Shu-hung Henry
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引用次数: 1

Abstract

Parallel inverters are always utilized in renewable energy systems to transfer the power from different renewable resources to the grid. However, the parallel inverters may suffer instability problem, i.e., even though each inverter is stable individually, the paralleled inverters may be unstable due to the interaction among these inverters or cables. Though a lot of existing stability impedance criteria have already been proposed to assess the stability of the paralleled inverters, they are all targeting specific systems with special assumptions, such as supposing all the inverter parameters are the same, ignore the cable’s impedance or treat all the cables as short cables, etc. In this paper, a generic stability impedance criterion has been proposed without any assumptions. Hence, this proposed criterion can evaluate the stability of any types of parallel inverters with different inverter parameters and long/short cables. The detailed derivation of the proposed criterion has also been presented. Finally, the effectiveness of this criterion has been validated by a 5 kW parallel inverters system including three totally different inverters & cables.
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并联逆变器系统的通用稳定阻抗判据
并联逆变器在可再生能源系统中经常被用于将不同可再生资源的电力传输到电网中。然而,并联逆变器可能会遇到不稳定问题,即即使每个逆变器单独稳定,并联逆变器也可能由于这些逆变器或电缆之间的相互作用而不稳定。虽然已有许多评价并联逆变器稳定性的稳定阻抗准则,但它们都是针对特定系统,并有特殊的假设,如假设所有逆变器参数相同,忽略电缆阻抗或将所有电缆视为短电缆等。本文提出了一种不加任何假设的通用稳定性阻抗判据。因此,该准则可以评估任何类型具有不同逆变器参数和长/短电缆的并联逆变器的稳定性。本文还详细介绍了该准则的推导过程。最后,通过一个5kw并联逆变器系统验证了该准则的有效性,该系统包括三个完全不同的逆变器和电缆。
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