Distribution-Side Inertia Estimation Method Based on Node Load Structure

As the synchronous generators are gradually replaced by renewable energy like wind turbines, the problem of insufficient inertia of the power system is becoming more and more prominent. The distribution-side inertia gradually plays a greater role in the process of maintaining the frequency stability of the power system. However, the existing distribution-side inertia estimation methods are relatively rough, and it is necessary to realize the accurate estimation of the distribution-side inertia. Through the analysis of the distribution side load composition and the inertia resources of all kinds of load composition under the new situation, the composition of inertia of distribution side load is clarified. Combined with the operating characteristics and changing rules of various load components, the load operation scenarios are divided and clustered to provide the basis for the load structure forecast. Aiming at the complexity of multi-scene modeling and model redundancy, the method of inertia-oriented aggregation of load structures is presented. Based on the inertia properties of node load structure and load components, a distribution-side inertia estimation method is proposed. According to the IEEE standard model, the simulation results indicate that the aggregation of load structures can effectively reduce the analysis burden. Compared with the existing methods, the accuracy of distribution-side inertia estimation based on node load structure is significantly improved.