Method for judging influence of power factor on small-interference stability of converter grid-connected system

Abstract

The invention discloses a method for judging the influence of a power factor on the small-interference stability of a converter grid-connected system. The method comprises the following steps: establishing a converter admittance model and a power grid admittance model by linearly processing a dynamic equation of the converter grid-connected system; forming a single-input single-output closed-loopsystem model by combining the converter admittance model and the power grid admittance model to obtain a closed-loop transfer function of the closed-loop system model; and judging by using a Nyquist curve according to the closed-loop transfer function to obtain a result whether the current running power factor of the converter can enable the converter to run stably or not. The influence of the power factor of the converter on the stability of the grid-connected system can be effectively judged, and the instability problem caused by improper setting of the power factor of the converter is avoided.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps determine if an AC voltage has enough energy at its terminals when connected into another electrical circuit without causing damage or affecting other parts that it'll be used with later. It also prevents malfunctions from overloading certain components within the device due to insufficiently high voltages during operation.

Problems solved by technology

This patented technical solution describes how large amounts of solar or wind may cause instability on an electricity network due to factors like changes caused by weather patterns that change over time (such as rain) or other environmental variables such as temperature fluctuations causing variations in load). To address this issue, there are two main methods: passive stabilization systems and automatic control techniques. Passively stable connections between generators and grids have been developed but they still require significant effort from researchers working at laboratories around them. Automatic control devices use feedback signals obtained during operation to adjust their settings based upon these issues.

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