Research On Generation Planning Model Of Power Systems With High Proportion Renewable Energy

The renewable energy generation,represented by wind power and photovoltaic,will be the main generation sources in our country’s power systems in the future.With the proportion of renewable energy generation continues to increase,it has a great impact on peak shaving,frequency regulation,dispatching and operation,and also brings new challenges to the security of power supply.Reasonable and forward-looking generation planning is an important means to ensure the safe and reliable operation of power systems with high proportion renewable energy.This article focuses on the generation planning of power systems with high proportion renewable energy,considering the different forms of renewable energy access to power systems,studies respectively the generation planning of long-term-stand-alone island microgrids and large grids with large-scale renewable energy.The main work carried out as follow:(1)Aiming at the generation planning of island microgrids with renewable energy as main generation sources,a two-level programming model combining generation investment decision-making and sequential operation simulation is established.In the sequential operation simulation layer,a Markov Chain-Monte Carlo model describing the randomness and timing of renewable energy is established first;then,fully considering the optimized dispatching characteristics of island microgrid with renewable energy as the main generation sources,and energy storage and diesel engine as the backup generation sources,an operation simulation model that can effectively simulate energy storage and diesel engine operation strategies and is simple to calculate is proposed,an load reduction strategy in the event of generation failure and generation shortage is also proposed.In the generation investment decision-making layer,an objective function considering the reliability and economy is proposed,and a solution algorithm combining heuristic search rules and discrete particle swarm optimization is designed.The effectiveness of the proposed generation planning method is verified by an example system based on a community-based island microgrid in Pakistan.(2)Aiming at the generation planning of large grids with large scale renewable energy,a multi-time scale flexibility evaluation model is designed considering the demand for system flexibility due to the volatility of renewable energy in the operation simulation link.Firstly,Based on the affine propagation clustering algorithm and the mathematical morphological filtering algorithm,the multi-time scale decomposition of the net load fluctuation is carried out.Then,on the basis of generation investment decision-making and hour-scale operation simulation,a flexibility evaluation of generation to deal with sub-hour-scale net load fluctuation is added,and the solution of generation planning scheme is realized based on the discrete particle swarm algorithm.The validity of the proposed generation planning model and method is verified by text examples and actual examples of Guangdong power grid.This article establishes the different types of generation-load dispatching strategies and model in the sequential operation simulation,and rmbeds the method of flexibility evaluation in the generation planning,the work has certain applications and references value for the more refined generation planning of power systems with large-scale renewable energy generation.