Bi-level Optimal Dispatch Strategy for Air-conditioning Load Based on Temperature and Switch Hybrid Control Under Distributed Photovoltaic Grid-connection

To cope with the voltage rise and transmission line overload due to residual distributed PV power injected into the distribution network, by use of good thermal energy storage characteristics of air-conditioning load in distribution network, a temperature and switch hybrid control-based bi-level optimal dispatch strategy for air-conditioning load was proposed, and a bi-level optimal dispatch architecture including power grid company, load aggregators (abbr. LA) and consumers was established. Firstly, taking the minimum sum of network loss cost and demand response cost as objective, the electric power company issued dispatching command to LA. Secondly, taking maximum profit as the objective, the LA chose the control modes for different consumers. Comparing with traditional control methods, the proposed strategy improved the response effect of the aggregated air-conditioning power to the step, and the requirement of dispatching command could be met more quickly, meanwhile the aggregated power could be kept stable, thus the accommodation of distributed PV was promoted, and the nodal voltage and the transmitted power of line could be kept within secure operation range. Finally, the proposed strategy was simulated by modified IEEE 33-bus distribution system. Both feasibility and effectiveness of the proposed dispatching strategy are verified by simulation results.