Active Distribution Network Active And Reactive Power Taking Into Account Demand Response Research On Robust Optimization

Faced with multiple problems such as increasingly severe energy shortage and ecological environmental pollution,it has become a global consensus to vigorously develop distributed new energy power generation represented by wind-power generation.At the same time,active distribution network,as an important part of smart grid,has been widely concerned because it can optimally manage many controllable resources in the network.However,the strong coupling between active power and reactive power and source-charge uncertainty bring many challenges to the optimal operation of active distribution network.In addition,demand response can effectively guide users to actively participate in power adjustment,which is of great significance to realize the economical and safe operation of distribution network.Based on the above,in order to improve the economy and security stability of distribution network operation,this paper systematically studies the active-reactive coordination and optimization of active distribution network,taking into account demand response,source-charge uncertainty,and the regulation ability of many active/reactive regulatory devices.First of all,the analysis introduced the initiative of the regulation in the distribution network resources,study the scenery power output characteristics of power systems and grid,this paper expounds the demand response technology of two kinds of incentive mechanism,analyzed the energy storage device,such as parallel capacitor to the working characteristic of active/reactive power regulating device,and according to the various job characteristics to establish the corresponding mathematical model.Secondly,the paper expounds and power flow calculation method is studied and its power is strong coupling,from two angles of network loss and voltage are studied of active,reactive power in the grid is strong coupling,and the example simulation system based on PG&E 69 nodes,the simulation results show that the network of active/reactive all influence on the system of network loss and voltage,active and reactive power within the power distribution system is proved the necessity of coordination optimization.Then,consider the distribution network within the active,reactive power is strong coupling,establishing active power energy meter and demand response and reactive power coordination optimization model,the model system to daily operation cost minimum as the target,the interruptible load transfer mechanism and energy storage device,adjusting equipment combining reactive power and to coordinate optimization of distribution network,and carries on the simulation calculation on IEEE33 node system,the results show that the model is feasible,at the same time by different operation schemes verify the proposed model can effectively improve system efficiency,improve the system voltage.Finally,in order to adapt to source-load uncertainty in the system,a box-type adjustable robust optimization model of distributed generation and load was constructed,and the objective function was to minimize the operation cost considering the penalty cost of rotating reserve capacity.The model is transformed into a mixed integer second-order cone programming problem by the second-order cone method,and the strong duality theory and Lagrange transform are further used to simplify the model.CPLEX is used to simulate the IEEE33 node system,and the results show that the model can effectively balance the economy and robustness of the system,which verifies the rationality and correctness of the model.