Generation Expansion Planning Under The Renewable Energy Policies

At present,China is in an important stage of economic and resource development,so improving energy efficiency,increasing energy supply,optimizing energy structure,and making the economy and energy environment develop together are urgent problems to be solved.In recent years,the implementation of green certificate trading mechanism and carbon emissions trading mechanism has played a considerable role in promoting the development of new energy.Therefore,based on the electricity market,green certificate trading system and carbon emissions trading system,this paper analyzed the generation expansion planning under the renewable energy policiesFirstly,considering the background of electricity market reform,a generation expansion planning model considering market competition and supply-demand relationship has been established.Without considering the new energy policy and environmental issues,the benefits of conventional coal-fired power plants are better than those of hydropower and wind power plants when the load growth rate is faster in the early stage of planning.The opening of the power side after the new electricity reform makes the power market more liberalized,the elasticity of electricity as a commodity will increase,and the user's response to electricity prices will be more sensitive.Moreover,the power enterprises will make corresponding adjustments according to the user's response,which will make the supply-demand relationship in the electricity market reach a balance point faster,what we call the inflection point of electricity demand.At the same time,as a reflection of supply-demand relationship,electricity price tends to be stable faster because of elastic demand,and price fluctuation is smaller.Secondly,for the tradable green certificate system based on renewable energy quota system,this paper adds tradable of green certificate to the power planning model.After the introduction of green certificate trading system,the number of new coal-fired units decreases and the number of new wind turbines increases.It shows that green certificate trading system plays an active role in promoting investors to invest in renewable energy generating units,and can effectively optimize the power structure and change the current situation of coal dependence.Through the analysis of the relationship between marginal cost and quota of traditional energy and renewable energy power generation,it can be concluded that the implementation of renewable energy quota system and green certificate trading market can not only stimulate renewable energy power generation,but also has a certain degree of restraint to traditional energy power generation.And the higher the quota index is,the more obvious the incentive effect of new energy is,but the later the green certificate market reaches a stable state,so the relevant departments need to give consideration to both the incentive of new energy and the stability of the market.Finally,aiming at the national carbon emission trading market,this paper introduces the allocation method of carbon emission quota and the accounting method of coal-fired unit emissions,and establishes a power planning model considering the carbon emission trading market.Through the analysis of three examples,we can see that the carbon trading market has a certain incentive effect on new energy,but the direct object of these incentives is not new energy generation,but traditional energy generation.Whether purchasing quotas in the carbon trading market or building new high-efficiency units and carrying out low-carbon retrofitting of units will increase the original cost of power generation and reduce the efficiency of coal-fired power plants.Finally,combined with the policies of TGCs and ET,power expansion planning is carried out for a certain region.The results show that it has a positive effect on the development of new energy sources and the realization of low carbon emission reduction targets.