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This paper studied the dynamic risk faced by electricity distribution sides and the optimal electricity purchase distribution problems under dynamic risk under the condition of introducing the market competition for distribution sides. With the gradual advance of the electricity market reform and putting forward of smart power grids, the original management pattern of vertical monopoly is gradually being broken. Thus the electrical distribution companies, as representative of end users, purchase electric energy in electricity market and then it to the end users. Due to the instability of electricity market, especially the electricity price in electricity market being affected by various factors, the volatility is very big and difficult to predict; at the same time, users’ electricity consumption is changing randomly, which will be changed along with users’ psychology of electricity consumption, electricity price and other factors. So the electricity distribution sides will face great when purchasing the electric energy, especially the dynamic risk changing in real time. Electricity distribution sides could carry out the optimal electricity purchase distribution based on the required evaluation indexes, and scientifically handle the interactional and conflicting relationship among risk, return and reliability of electricity distribution sides.

Optimal Purchase Distribution and Risk Assessment of Power Supply Enterprises Based on Portfolio Optimization