Optimization Of Power System With Large-scale Wind Power Integration Considering Peak Regulation

Wind power is one of the pillar industries in the new energy development planning,and its proportion ratio in power supply structure increased rapidly due to its clean,low-carbon and renewable characteristics.As a representation of sustainable energy,wind power is gradually replacing traditional generations motivated by fossil fuels.Large-scale wind power integration is one of the future vision of the power system.However,wind integration increases the uncertainty in power system,and it has a detrimental effect on the reliability of power supply,especially in peak regulation.And,the peak regulation capability of power system also restricts the integration level of wind power capacity vice versa.Therefore,the distribution of the active adjustable resources needs to be extensively analyzed,to alleviate peak regulation pressure of power system,promote wind power penetration and improve the efficiency of power system operation.Based on the analysis of power balance during peak regulation of wind integration system,this thesis explores the application of unit's transformation for deep peak regulation in improving its peak-regulation ramp capability and its application on wind penetration promotion and system efficiency promotion,and then to provide reference for the future wind power construction planning.The main work and contributions are as follows.Firstly,wind integration sharps the fluctuation trend of system net load in hourly period,and the classical peak regulation approach may not be able to effectively track its rapid fluctuations.This thesis classifies the peak-regulation requirement as peak-power-regulation capacity requirements and peak-ramp-regulation capability requirement,then analyze their relationship with the base point of generation unit output.Unit commitment model considering the peak-ramp-regulation capability response constraint is then formulated,in which the peak regulation demand and ramp demand are covered by the peak regulation capacity and ramp capability.In this way,it can effectively follow the extreme fluctuation of net load in its confidence interval.The conservativeness can be controlled by altering the peak regulation satisfaction coefficient Secondly,given the additional energy costs caused by unit's deep peak regulation,this thesis compares peak-regulation flexibility releasing effect and efficiency promotion effect under different units' peak regulation depth.In fact,deep peak regulation is to enhanced with sacrificing the operation efficiency of unit.With the goal of minimizing the total costs of power system,the unit's deep-peak-regulation transformation model is proposed,and the degree of deep-peak-regulation transformation and the variation of entire operation efficiency under different wind power integration level are analyzed.Finally,from the perspective of decision making for the optimal wind power installed capacity,this thesis established a wind power siting and sizing model,with the goal of maximizing the social welfare.The model considering the impact of power system peak regulation capability and transmission capacity restrictions on the accommodation of wind power.Considering that the development of corresponding transmission lines is later then the establish of wind farm,the transmission capacity limits the accommodation of wind power and therefore barrer the expression of units' peak-regulation flexibility.In the thesis the transmission constraint is modified.Case study analyzes the auxiliary construction planning cooperating with wind farm construction,in order to promote wind penetration and obtain better economic benefit.