A Fast Calculation Method of Characteristic Coefficients of Dynamic Load Model

Abstract

The invention relates to a rapid dynamic load model characteristic coefficient calculation method and belongs to the electric power system stabilization and control technology field. The method comprises steps that a slip ratio is calculated; according to relationships between the slip ratio and the frequency and the voltage, relationship expressions of active power and reactive power absorbed by an induction motor are solved; according to the acquired active power and the acquired reactive power, the partial derivatives of the stator side frequency are solved respectively, the partial derivatives are multiplied by a ratio of the initial frequency to an initial power to acquire a frequency characteristic coefficient expression; according to the acquired active power and the acquired reactive power, the partial derivatives of a power source voltage are solved respectively, and the partial derivatives are multiplied by a ratio of an initial voltage to the initial power to acquire a voltage characteristic coefficient expression. The method is advantaged in that the complex calculation process is simplified, the calculation time and workload are saved, and the relatively simple relationships among the active power, the reactive power, the slip ratio, the frequency and the voltage are acquired.

Description

technical field [0001] The invention relates to a fast calculation method for characteristic coefficients of a dynamic load model, belonging to the technical field of power system stability and control. Background technique [0002] With the gradual development and improvement of my country's "West-East Electricity Transmission, North-South Interconnection, and National Networking" strategic project, it has become an inevitable development trend to realize asynchronous interconnection among provincial power grids. Asynchronous interconnection can effectively reduce short-circuit capacity, eliminate reactive power problems, and improve the reliability of stable system operation. However, the feed-in of the DC system makes the system operation mode complicated, and the commutation failure of the DC system is likely to cause DC blocking faults. In some microgrid systems or small islands, if a fault occurs or there is a special impact load, the frequency characteristics and volt...

AI Technical Summary

Problems solved by technology

Load modeling is a very complex problem: the load of the power system is composed of many different electrical equipment, and there are many types; the load composition and load quantity change with time; there is a lack of accurate data on the load composition; Many loads are nonlinear

The accuracy of the model will directly affect the simulation results and the decision-making scheme based on it. An inappropriate load model will make the calculation results inconsistent with the actual situation, thereby posing potential dangers to the system or causing unnecessary waste.

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