Study On Annual Power Supply-demand Balancing Considering Renewable Energy Consumption Mechanism

In order to promote the consumption of renewable energy power,the state has launched the construction of a renewable energy portfolio standard and a tradable green certification mechanism,and improved the auxiliary service rules for power plants.However,the existing annual power supply-demand balancing method does not involve the renewable energy portfolio standard and the tradable green certification mechanism,and the classification of renewable energy quotas and green certificates in the rules is not perfect.The interaction between the electricity and green certificate transactions is single,and so is the peak shaving auxiliary service.The peak-shaving compensation scheme of the thermal power unit is single.Therefore,the existing annual power supply-demand balancing method and the rules of the renewable energy consumption mechanism considered do not apply to the provincial power grid companies with mixed power sources,inter-provincial transactions,and large thermal power unit capacity spans.How to simulate and quantify the quota constraints,flexible peak shaving capacity of the provincial power grid,and take into account the cost of green certificates and ancillary services,is the key issue that needs to be solved urgently in the annual power supply-demand balancing analysis.To this end,the paper conducts research on the annual power supply-demand balancing analysis method considering the renewable energy consumption mechanism.The specific work is as follows:(1)Established the MILP model of the annual power supply-demand balancing of the hybrid power supply under the renewable energy portfolio standard,optimized and improved the quota classification.Taking into account the total renewable energy quota and non-aqueous renewable energy quota,considering the annual cycle,the monthly coordination ability of the hybrid power system with thermal power,storage hydropower and non-aqueous renewable energy sources,and detailed analysis of the impact of renewable energy portfolio standard on the annual power supply-demand balancing of the provincial grid.This method is suitable for the transition period from the on-grid electricity price subsidy system to the renewable energy portfolio standard,and the period when the renewable energy portfolio standard is fully applied,emphasizing the incentive effect of the power generation side.The model takes the independent provincial power grid as the research object,aims at the minimum annual power generation cost.It considers the operating constraints,system constraints,renewable energy portfolio standard constraints of various types of hybrid power units.CPLEX simulation verifies that the model can lower the national financial subsidy costs and effectively increase the generation of various renewable energy sources.(2)A multi-regional annual power supply-demand balancing MILP model considering renewable energy portfolio standard and tradable green certification mechanism is proposed.The model improves the rules and procedures of the green certificate transaction mechanism and improves the classification of green certificates.It takes into account the two transaction methods of bundling and separation of electricity and green certificates.It also takes into account the inter-provincial and intra-provincial regions green certificate flow behavior and power transmission limit.The model considers the monthly joint adjustment capabilities of storage capacity hydropower,thermal power and non-aqueous renewable energy power and various green certificates,emphasizes the incentive effect on the user side,and aims at the minimum annual electricity purchase cost of the provincial grid,taking into account system constraints,cross-section safety constraints,operation constraints of various types of energy power stations,power and electricity constraints,and renewable energy power certificate system constraints,etc.The CPLEX software simulation verifies the feasibility and effectiveness of the model.(3)In the context of the renewable energy portfolio standard and the tradable green certification mechanism,a multi-regional annual power supply-demand balancing method considering the auxiliary service of thermal power unit peak shaving was established to solve the problem of renewable energy consumption caused by insufficient peak shaving capacity.The model aims to minimize the annual electricity purchase cost of the provincial power grid,add the paid peak shaving cost of the thermal power unit,and propose a differentiated peak shaving step compensation method that takes into account the peak shaving rate and peak shaving cost based on the thermal power unit capacity After linearization,the obtained MILP model was verified by CPLEX simulation to improve the consumption of renewable energy and reduce the electricity cost of the whole system.