New energy grid-connected inverter self-synchronizing voltage source control method

Abstract

The invention discloses a new energy grid-connected inverter self-synchronizing voltage source control method, and belongs to the field of new energy power control. The control comprises the following steps that a new energy grid-connected inverter provides a frequency and voltage active support control method with a large power grid self-synchronization characteristic according to active power and reactive power of a system; in order to adjust the impedance characteristic between the internal potential of the self-synchronizing voltage source of the new energy grid-connected inverter and the large power grid voltage, an impedance adaptive control algorithm is adopted while a current instruction of the self-synchronizing voltage source is given; and finally, a current closed-loop control algorithm based on a resonance controller is adopted in a two-phase synchronous rotating coordinate system, so that the new energy grid-connected inverter gives consideration to the improvement of the grid-connected current performance while realizing the white synchronization characteristic, the current control capability under the unbalanced condition of the power grid is improved, and the overall performance of the new energy grid-connected inverter is improved.

Description

Technical field [0001] The present invention belongs to the field of new energy power control, involving a new energy grid inverter self-synchronous voltage source control method. Background technique [0002] Under dual-carbon background, future power systems will present new power system features based on new energy, and new energy proportion is expected to be 50%. However, new energy power generation such as photovoltaic, wind power has randomness, weak grid support characteristics, and low-resistance performance, which seriously weakens the power of the grid voltage and frequency of the power grid voltage, and brought the safety and stability of the new power system. Very big challenge. Therefore, in-depth research of the active support technology and system stable operation control method under the high proportion of infiltration of new energy, it is of great significance for new energy power systems. [0003] In recent years, domestic and foreign experts have explored new e...

AI Technical Summary

Problems solved by technology

This control method is beneficial to the large-scale centralized grid connection of multiple virtual synchronous generators, and the single control algorithm is complex and cannot take into account the current control performance

[0008] In short, the existing self-synchronizing voltage source technology is difficult to take into account both the self-synchronizing characteristics of the power grid and the control ability of current performance, especially the current control performance under the state of large power grid voltage imbalance, which is not conducive to the grid connection of self-synchronizing voltage sources under complex power grid conditions Improved current performance

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