A new energy station grid-connected control method and system

By adjusting the output active power command and signal model of the grid-connected converter to calculate the grid voltage strength, the problem of new energy power plants being unable to determine the strength of the grid was solved, thus improving grid stability and power quality.

CN122178413APending Publication Date: 2026-06-09CRRC ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The inability of new energy power plants to assess grid strength in real time makes it impossible to adjust the operating mode of grid-connected converters according to grid strength, and also makes it impossible to adjust virtual inertia parameters, thus affecting grid stability and power quality.

Method used

By repeatedly adjusting the active power output command of the grid-connected converter, the output parameters of the grid-connected converter are obtained. Combined with the signal model from active power to phase angle, the grid voltage intensity is calculated, and the converter's operating mode is controlled according to the grid voltage intensity and the preset threshold.

Benefits of technology

It has enhanced the stability of the new energy power station system, improved the reliability of new energy grid connection and its support capacity for the power grid, and optimized the operation status of the power grid.

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Abstract

The grid-connected control method and system for new energy power plants provided by this invention involves repeatedly adjusting the active power output commands of the grid-connected converters. After the grid-connected converters are stably operating in the grid, the first, second, and third output parameters of N grid-connected converters are obtained. Combined with a model of active power to phase angle, the equivalent impedance between the (N+1)th grid-connected converter and the common coupling point is obtained. Based on this equivalent impedance and a preset formula, the grid voltage intensity is calculated. The actual grid voltage intensity is compared with a preset threshold, and the corresponding grid-connected converters are controlled to operate according to the corresponding working mode. Compared with existing technologies, this invention optimizes the allocation of active and reactive power commands from the grid dispatch to each converter device and quickly and smoothly issues source-grid-load control terminal commands to the new energy power plant, enhancing the overall system stability of the power plant, improving the reliability of new energy grid connection, and increasing the support capability of the new energy power plant for the grid.
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