Real-time Simulation Method of Power Electronic Switch Interpolation

Abstract

The invention discloses a power electronic switch interpolation real-time simulation method based on the backward Euler-trapezoidal weight integration method, comprising the steps of: at the time when the power electronic switch is turned off, linear interpolation is used to determine the exact time point of the switch action and related state variables ;According to the position of the time point of the switch action in the simulation step of the current step, the piecewise function is constructed by using the ordinary differential equation backward Euler-trapezoidal weight integration method, and the numerical solution of the whole-step simulation time point of the system is obtained by integration. In the process, each quantity of the system needs to be re-initialized, so as to obtain the correct network topology and initial value of the system at this moment. The invention effectively solves the traditional problem that frequent actions of power electronic switches in the electromagnetic transient simulation of the power system lead to high-frequency changes in the system topology, thereby affecting the efficiency of the electromagnetic transient simulation.

Description

technical field [0001] The invention relates to a power system, in particular to a power electronic switch interpolation real-time simulation method for the power system. Background technique [0002] my country's energy distribution and regional development are extremely unbalanced, so it is necessary to build a series of long-distance power transmission projects such as west-to-east power transmission. In order to solve the problems of low power transmission efficiency and unstable new energy access, my country's power grid has widely introduced new technologies such as high-voltage DC transmission, flexible AC transmission, and distributed power generation technology, including a large number of FACTS, Rectification and inverter devices, reactive power compensation devices (SVC, STATCOM) and other devices, power network operation control is becoming increasingly complex. The development trend of the modern power system is cross-regional networked operation. Except for a f...

AI Technical Summary

Problems solved by technology

[0008] 2) Simultaneous action of multiple switches in the same step length makes simulation difficult to detect and calculate;

[0009] 3) The forced commutation device simulation state variable mutation problem;

[0010] 4) Fast and high-precision resynchronization of simulation and full-step time points

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