光伏電源對10kV配電網(wǎng)保護(hù)影響的研究
[Abstract]:If human beings want to effectively solve the problem that fossil energy is on the verge of scarcity, the development of renewable energy is a feasible and important way. Photovoltaic power generation is the most obvious advantage and the most potential for development among many renewable energy power generation. In recent years, the permeability of photovoltaic power supply connected to the grid is increasing day by day, which brings challenges to the distribution network. The system characteristics, power flow distribution, short circuit current flow direction and node voltage will change due to their access, the original protection configuration can not meet the needs, and is not suitable for the current distribution network environment. First of all, this paper expounds the related concepts of relay protection, task requirements, the action principle, setting principle and sensitivity check method of three-stage current protection commonly used in traditional distribution network, and analyzes how to cooperate with each other between protection. Reliable isolation of faults. The photovoltaic power supply model, main functions and related parameters of ETAP software are analyzed. Referring to the actual distribution network structure and protection characteristics, the 10kV system model is established by using ETAP software, and the parameters of each component in the model are set up reasonably, and the scientific and reasonable design of the model is verified by running power flow. Secondly, the influence of photovoltaic access on protection is analyzed theoretically. Through the simulation model established by ETAP software, the three factors that affect the normal operation of relay protection are photovoltaic access capacity, access point location and the relationship between the location of the access point and the access point. The effects of the above three factors on short circuit current and protection action are analyzed and summarized by simulation. Finally, according to the specific influence situation, the admission capacity of photovoltaic power supply is calculated, and the access capacity of photovoltaic power supply is properly limited on the basis of the original protection configuration. ETAP software simulation is used to verify the effectiveness of the above strategy. This paper provides a theoretical and practical basis for the study of the influence of photovoltaic access distribution network on relay protection.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TM615;TM77
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