New energy fault ride-through control method, device and system adaptive to load change

By using an adaptive load change control method, combined with voltage and frequency information, the reactive and active power outputs of new energy generating units are dynamically adjusted, which solves the grid stability problem caused by the difference in response characteristics between new energy power generation equipment and traditional synchronous generators, and improves the grid's safety, stability and fault ride-through capability.

CN121840639APending Publication Date: 2026-04-10STATE GRID ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The difference in dynamic response characteristics between new energy power generation equipment and traditional synchronous generators leads to safety and stability problems in the power grid when there is insufficient voltage support and mismatch between load active power response. Existing technologies address this by increasing the grid's operating capacity and limiting transmission power, which restricts the power grid's ability to absorb power.

Method used

By incorporating voltage and frequency information and employing an adaptive load change control method, the active and reactive power outputs of new energy generating units are optimized to fit the regional load response characteristics. This enables dynamic adjustment of the reactive current and active power command values ​​of new energy generating units, prioritizing the control of reactive current to enhance grid stability.

Benefits of technology

It effectively reduces short-term power surges after grid faults, enhances the grid's ability to operate safely and stably, and optimizes the grid's fault ride-through capability.

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Abstract

The invention discloses a new energy fault ride-through control method, device and system adaptive to load change. The method comprises the following steps: acquiring a voltage amplitude and frequency of a grid-connected point of a new energy unit and active power before a fault in real time; when the voltage amplitude of the grid-connected point of the new energy unit is lower than a low-voltage fault ride-through starting threshold value, entering a low-voltage fault ride-through control mode, calculating a reactive current instruction value and an active power instruction value based on the voltage amplitude variation and the frequency variation of the grid-connected point of the new energy unit, and preferentially controlling the reactive current; and when the new energy detects that the voltage amplitude of the grid-connected point is higher than the low-voltage fault ride-through recovery threshold, exiting the low-voltage fault ride-through control mode, setting the reactive current instruction value to be zero, and calculating an active power instruction value based on the voltage amplitude variation and the frequency variation of the grid-connected point of the new energy unit until the active power before the fault is recovered. According to the invention, voltage and frequency are introduced, fitting of active and reactive output of the new energy unit and regional load response characteristics is realized, and the safe operation capability of a power grid is enhanced.
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