Hybrid Simulation Method for Power Electronics Devices Based on Interface Equivalence and Interaction

Abstract

The present invention, belonging to the field of digital simulation technology in the power system, discloses a hybrid simulation method including a power electronic equipment based on interface equivalence and interaction. According to the present invention, the network of the power system is divided into an electromagnetic transient side subnet and an electromechanical transient side subnet, wherein a power model equivalent to electrical characteristics of a lower frequency range of the electromagnetic transient side subnet is built, the electromagnetic transient side subnet performs simulation according to the power model and then sends the simulation results to the electromechanical transient side subnet, and the electromechanical transient side subnet builds and solves semi-dynamic vector and half mirror model to build controllable and fundamental frequency ideal current source, and simulate the electromechanical transient side subnet; according to the present invention, an applicable scope of the hybrid simulation method is widen, an error caused by interaction delay is reduced, an error caused by the equivalent model in a large fault disturbance is lowered through the semi-dynamic vector and half mirror model, and the semi-dynamic vector and half mirror model has a good numerical stability, the requirement on the accuracy of the hybrid simulation, calculation quantity of the interface equivalence method is small, and the calculation speed is improved.

Description

technical field [0001] The invention relates to a hybrid simulation method including power electronic equipment based on interface equivalence and interaction, and belongs to the technical field of power system digital simulation. Background technique [0002] New fast-response large-capacity devices in modern power systems are widely put into operation, especially the multi-circuit conventional high-voltage direct current transmission projects and flexible high-voltage direct current projects. The state process and the electromechanical transient process are tightly coupled. If the electromagnetic transient simulation is only performed, the scale is limited, and most of the power grid needs to be simplified by equivalent value; and if the electromechanical transient simulation is only performed, the detailed electromagnetic transient behavior characteristics of the local power grid or equipment and devices cannot be accurately simulated. In this regard, the electromagnetic...

AI Technical Summary

Problems solved by technology

[0007] In traditional hybrid simulation, large-capacity power electronic devices and high-voltage DC transmission lines are calculated as power sources or current sources on the electromechanical transient side. Within a step, the equivalent power or equivalent current is constant, which cannot be described The response characteristics of the electromagnetic transient side subsystem at the port, especially in the case of large fault disturbances, the error caused by the equivalent model is more prominent

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