Day-ahead and Intra-day Joint Dispatch Strategy of High Proportion Wind Power System Considering Dynamic Frequency Response Constraints
A high proportion wind power system has the characteristics of low inertia and weak frequency modulation ability,which is easy to cause frequency safety problems.In the existing research on dispatch strategy considering frequency security constraints,the means of frequency modulation are mainly inertial response and primary frequency modulation.There are few studies considering the dynamic response of system spinning reserve and emergency power support under high power disturbance such as single unit fault.Hereto,the dynamic frequency response constraints of system under expected low power disturbance and high power disturbance are introduced into the day-ahead and intra-day joint dispatch model.First,the dynamic frequency response models of system under two expected power disturbance are constructed respectively,then the ladder reserve method is used to reduce the order of the model,and the analytical expressions of the frequency index under the two models are derived.Then,the day-ahead and intra-day joint dispatch architecture considering dynamic frequency response constraints is proposed.The day-ahead and intra-day dispatch models are constructed respectively.Furthermore,aiming at the nonlinear problem caused by the maximum frequency difference constraints in the dispatch model,the two-stage iterative method is used to solve it.Finally,an example is given to show that the proposed joint dispatch strategy can meet the requirements of system economic operation and frequency security.
high proportion wind power systemdynamic frequency responseladder reserveday-ahead and intra-day joint dispatchtwo-stage iterative method
万方数据
维普
