Evaluation Method for the Supply Capacity of Distribution Networks for Electric Energy Substitution Considering Power Quality

As the integration of electric energy substitution intensifies, challenges such as harmonic pollution, voltage deviations, and increased loads on distribution systems become more pronounced. This paper introduces a comprehensive approach to assess the maximum supply capacity for electric energy substitution loads. Initially, the method identifies the grid's vulnerable points-nodes prone to excessive loads or degradation in energy quality under altered conditions. If the power grid maintains normal operation with electric energy substitutes at these vulnerable points, other integration schemes are likely viable. Subsequently, the harmonic contents of various substitution devices are examined through simulation models. Given that harmonic distortion-a crucial indicator of electric power quality-is challenging to integrate into optimization models, the permissible integration level of electric energy substitutes is determined based solely on grid standards for total harmonic distortion, using harmonic flow calculations. Finally, an optimization model is developed to maximize the overall capacity for integrating electric energy substitutes, using the initial findings as constraints. This method takes into account the weak points of the power grid and the quality of electrical energy, yielding a conservative estimate of maximum capacity, and provides a reliable assessment basis for the power grid.