Electrical Network Equivalent Modeling Method with Boundary Buses Interconnected

This paper proposes an equivalent modeling method (EMM) based on system measurements to reduce the scale of electrical network. In this method, the equivalent network model adopts a novel framework with boundary buses interconnected to improve the accuracy of equivalent network while maintaining the simplicity of the network structure. Obtaining the unknown parameters of equivalent network is regarded as a parameter identification problem in EMM, which is actually a least square estimation (LSE). The objective function of this LSE is built upon the predictive errors without the adoption of weight tuning. The LSE is solved using interior-point method and the optimal solution is regraded as identified parameters. Simulation studies on a 5-bus test system and an IEEE 30-bus test system demonstrate the efficiency and the practicability of the EMM under different operation states.