Operational analysis of large power grid desiderates a fast way to get complete scheduling information

but the calculation accuracy of traditional hot-start linearized models is highly dependent on the operating environment. So the voltage amplitude and phase angle are decoupled

and the power balance equation is linearized in different degrees by means of Taylor series expansion to obtain a semi-linearized model and a full-linearized model considering both voltage amplitude and reactive power. As for semi-linearized model

the method of calculating the equivalent load of network loss is improved

and a DC model based on improved network loss equivalent load is proposed to provide a good operating point. For the full-linearized model

the operating point is updated iteratively to eliminate its dependence on the operating environment. Case analysis results show that three proposed linearization models have high calculation accuracy and solution efficiency.