Research On Power Supply Capability Of Active Distribution Network Based On Optimized Dispatching Of Interruptible Loads

The continuous increase in power demand and the rapid expansion of the distribution network make the maximum power supply capacity an important indicator for assessing the safety level of power distribution system construction.Therefore,calculating the maximum power supply capacity has become an important research content.At present,most of the research on the maximum power supply capacity is for the traditional distribution network,but as the traditional distribution network continues to evolve to the active distribution network,there are more means to improve the power supply capacity.How to optimize the power supply mode of the distribution network,tap the potential of power supply,promote the utilization of renewable energy,and slow down the distribution network transformation project is of great significance to the development of China's power supply industry.After researching and summarizing the existing results of power distribution capacity of distribution network,this paper mainly studies the optimization of power supply capacity of active distribution network considering energy storage and interruptible load.The main research contents are as follows:(1)Introduced the relevant technical performance indicators of energy storage system,focused on the performance factors affecting battery energy storage,and established the economic benefit model of the state of charge model and battery energy storage system.The concept of interruptible load and the content of interrupted contract are introduced.The cost and economic benefit model of interruptible load participating in grid dispatching operation is established.It provides a theoretical basis for the study of energy storage and interruptible load for improving power supply capacity.(2)For the case that the energy storage and the interruptible load are respectively connected to the distribution network,the maximum load that the distribution network can supply is the target.And the safety constraints of the voltage,feeder and power flow of the distribution network system are taken into account.The model is established by using the repeated power flow algorithm.The maximum power supply capacity considering energy storage or interruptible load can be calculated separately.Finally,an example is used to verify the effectiveness of energy storage and interruptible load in improving the power supply capacity of the distribution network.(3)A strategy based on integrated optimal scheduling of interruptible load and battery energy storage to improve the power supply capacity of the active distribution network is proposed.Based on the BESS charge and discharge model and the IL user interruption model,the target is the maximum similarity between the maximum power supply capacity of the active distribution network and the daily load curve,meanwhile taking into account the grid side benefits.The improved particle swarm optimization algorithm is used to solve the model and decision-making based on the entropy weight method and the DM analytic hierarchy process.Finally,the improved IEEE33 node system is used to validate the strategy.And the power supply capacity growth in the four scenarios is compared and analyzed.The results show that the power supply capacity can be balanced and improved by implementing the joint optimization dispatching of interruptible load and energy storage.The maximum power supply capacity of the grid verifies the effectiveness of the proposed strategy.