Abstract
The proportion of grid-connected power electronic equipment is already large enough to influence the dynamic characteristics of the modern power system. Ensuring the stability of grid-connected power electronic equipment in all relevant situations is one of the foundations for reliable power system operation. In contrast to conventional rotating machines, the stability of power electronic devices mostly depends on the applied control strategy, and a large diversity of different complex control strategies are in practical use. Also, the investigation of stability of such systems needs to take into account the non-linear behaviour of the power electronic equipment. These are the main reasons why the system behavior of grid-connected power electronic equipment cannot be reproduced satisfactorily when aplying a single method of stability analysis, evaluation and testing method. During the last years, faults which led to tripping of converters due to stability problems occurred frequently even though standardized fault compliance tests were performed on these converters. In this paper these stability issues are analyzed. Also, a three-dimensional stability analysis method is suggested in order to comprehensively cover system behavior. The three dimensions are the time/scale dimension, the equipment number dimension and the local or global range of the stability analysis dimension. Based on this three-dimensional framework, this paper proposes a stability evaluation as well as a test process applying a hardware-in-the-loop test concept. Through the verification and testing of the stability of the actual grid-connected power electronic equipment, the method proposed in this paper is verified for up-to-date equipment.
Highlights
The penetration of modern power system, with components connected via power electronic devices, converters, has been increasing tremendously during the last years
The complexity results from three different dimensions. These are firstly the penetration number of power electronic equipment investigated in the analysis [2], secondly the timescale of dynamic behavior to be investigated [3] thirdly the local or global range of system behavior [4, 5]
2.2 Stability analysis method Based on the framework of three-dimensional stability analysis, this paper presents a set of stability analysis methods for power electronic equipment
Summary
The penetration of modern power system, with components connected via power electronic devices, converters, has been increasing tremendously during the last years. The complexity results from three different dimensions These are firstly the penetration number of power electronic equipment investigated in the analysis [2], secondly the timescale of dynamic behavior to be investigated [3] thirdly the local or global range of system behavior [4, 5]. This framework is obtained from combining the three dimensions of number of power electronic equipment, time-scale and analysis range of system behavior. Due to the influence of filters and transmission lines, the interaction of equipment in the time-scale of sideband signals is very weak, so the system stability analysis of this time-scale is not within the scope of this paper. Qualitative and quantitative analysis of non-linear large-signal models
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