Abstract
With the development of new energy technologies, distributed generation (DG) plays a growing role in power distribution networks. Although it solves the power supply problem in some areas, it also poses a challenge to the traditional power grid. To help with this problem, we establish a static voltage stability analysis model for high penetration DG, taking into account its large capacity, and the high fluctuations of its output. Based on the theoretical analysis and the mathematical derivation, we propose an improved voltage stability evaluation index (IVSE) accounting for DG. Finally, using the typical circuit of the IEEE 33 & 69 node system, we simulate high penetration DG access in different locations and capacities. In the simulations, the traditional power flow equation is modified by a continuous parametric equation accounting for DG. Based on consideration of the system transmission power limit, voltage stability margin and system loss, the value of IVSE is demonstrated, in comparison with the traditional index. Thus, we verify that the IVSE index is easy to understand, simple to calculate, and highly versatile.
Highlights
In recent years, the field of distributed generation (DG) for power generation has developed rapidly, helping to reduce the demand for traditional fossil-based energy sources, producing less polluting emissions, and protecting the environment
IVSE as an evaluation index, under the centralized access variation of DG capacity is considered in the derivation process of IVSE, compared with the Voltage Stability Evaluation Index (VSE), it mode, helps to improve the voltage of the access point and its nearby nodes, and reduces network can better reflect the influence of DG capacity change on system power flow distribution
A static stability model was presented. This model corrects the conventional power flow equations by accounting for the characteristics of DG, and is simple, easy to understand, and versatile. Through solving this model mathematically, we obtain the IVSE index, which can reflect the high penetration of DG
Summary
The field of distributed generation (DG) for power generation has developed rapidly, helping to reduce the demand for traditional fossil-based energy sources, producing less polluting emissions, and protecting the environment. For specific problems, existing studies tend to build their own load models, use conventional power flow calculations to do an analysis, and put forward various voltage stability evaluation indexes of original design, and they mainly do voltage stability and reactive power control strategy studies. In this paper, based on high penetration DG access with different positions and capacities, under the premise of varied voltage profile, load growth mode and active loss, an improved voltage stability evaluation index (IVSE) is proposed The theory of this index is simple to calculate and easy to understand, and it is flexible to modify according to demand, so as to reflect the impact of DG access on the distribution network. The proposed IVSE index can provide an efficient reference to engineers, electric utilities, and researchers and so on, on handling the optimization problems concerning high penetration of DGs in distribution networks
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