Abstract
The three-step rule of distributed photovoltaic (DPVs) connecting to a distribution network in the planning of practical photovoltaic projects is modeled in this paper. On this basis, a method based on large sample historical generation-load data is proposed to comprehensively evaluate the DPV limit penetration level of the low voltage–medium voltage (LV-MV) distribution network, which is the premise of DPV connection planning. Considering the fluctuations of generation-load data in time and space, the DPV limit penetration level of the LV network is evaluated based on kernel density estimation. On this basis, considering the uncertainties of DPVs connecting node schemes and connection capacity, the limit penetration level of DPVs continuously connecting to the MV network is evaluated based on the dichotomy method and stochastic simulation. Finally, the feasibility of evaluating the DPV limit penetration level by the proposed method is verified based on an example of a real distribution network, which is of great importance for the planning of a distribution network with high DPV permeability to continuously connect to DPVs.
Highlights
The gradual depletion of global primary energy has prompted people to pay more attention to renewable and clean energy [1,2], and new energy-based power generation has become the focus of energy development in various countries
In view of the three-step rule of distributed photovoltaic (DPV) connecting to the distribution network, this paper proposes a method to comprehensively evaluate the DPV limit penetration level of an low voltage–medium voltage (LV-MV) distribution network based on large sample historical generation-load data
This paper proposed a comprehensive evaluation method of LV-MV distribution networks based on large sample data of generation-load
Summary
The gradual depletion of global primary energy has prompted people to pay more attention to renewable and clean energy [1,2], and new energy-based power generation has become the focus of energy development in various countries. To increase people’s income and promote local development, the Chinese government has special subsidy policies for the construction of a distributed photovoltaic (DPV) system, and grid companies have provided certain policy incentives for grid-connected DPVs on the user side. Considering that voltage deviation is the most prominent influence [6,7], it is necessary to carry out related research on the DPV limit penetration level of distribution networks under the constraint of voltage deviation. In actual projects, DPVs are preferentially connected to low-voltage (LV) distribution networks, and to medium-voltage (MV) distribution networks. Due to their different connecting abilities, the DPV limit penetration level of low voltage–medium voltage (LV-MV) distribution networks should be evaluated comprehensively rather than separately
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