Research On Renewable Energy Consumption Considering Uncertainty

In recent years,China's renewable energy has been growing rapidly.However,the phenomena of wind and solar power curtailment because of the lack of the peak-load regulating capacity in power system,the CHP(Combined Heat and Power)units operating on the principle of "power determined by heat",the mismatch between installed capacity of renewable energy and the demand for electricity,the lack of local consumption capacity,the unbalance between renewable energy power generation and grid construction,and the transmission capacity restrictions,still exist,which brings serious challenge to power system economic operation.The randomness,variability and uncertainty of renewable energy power generation further increase the difficulty of grid-connected consumption.To solve the problem of renewable energy consumption,measures should be taken from the aspects of generation,grid,load,storage,power market and other areas.In this paper,scenario analysis was used to deal with the influence of uncertainty of wind and solar power output.Focusing on the issue of renewable energy consumption,the following research was carried out:Under the current grid conditions and technology,renewable energy consumption has more to do with economic and policy issues.Aiming at the problem of wind power energy allocation in power market under the market mechanism of combining fixed price and subsidy in similar of Spanish power market,the power allocation strategy of wind power supplier was studied and a multi-level market power allocation model with different time scales to deal with the uncertainty of electricity price by portfolio theory was proposed.The model was used to calculate the proportion of the total electricity supply in different power markets.The market mechanism was analyzed according to the wind power supplier's participation in the power market.The results indicate that the proposed model can make the wind power supplier with different risk preferences better balance the gains and risks,and provide the ideas for the allocation of electricity.The premium subsidy in the market mechanism is very obvious to the wind power suppliers to participate in the electricity market,and how to set a reasonable proportion of subsidy is the key to guide the wind power supplier to participate the power market.Considering using the multi-energy complementary strategy to improve the ability of renewable energy consumption,the integrated electricity-heat energy system which is coupled by CHP units and power-to-heat equipment is researched and a combined heat and power dispatch considering the energy storage characteristics of the heating network is formulated.In the optimal dispatch model which comprehensively takes into account the complementary characteristics of electrical system and thermal system,temperature dynamics equation considering transmission delay in the pipelines is used to reflect the energy storage characteristics of the heating network.In addition,the transmission loss in the pipelines,the user flexible demand for thermal energy and other heating network constraints are taken into account in the model.The simulation indicates that the proposed model can coordinate the generation,grid,load in the system and realize optimal matching of heat and power thus improve the renewable energy consumption ability.