Abstract

The existing virtual inertia control increases the system's moment of inertia, which is beneficial to reduce the short-term frequency drop, but has no supporting effect on the steady-state frequency, and the fan is likely to cause negative power penetration of the system during the recovery of kinetic energy after discharge, resulting in a frequency twice. collapse. In order to realize the transient control performance of grid transient and steady-state frequency under high-permeability wind power, a robust integrated frequency response model with virtual inertia support and steady-state frequency secondary support is constructed. The model includes wind-fire with high wind penetration rate. The bundled DC delivery system and the 500 kV large-scale transmission grid with wind farms control the power contribution of the fan at different time scales with the system frequency change rate. The additional frequency secondary support control strategy establishes the wind speed and the virtual inertia of the fan. The relationship between the coefficient and the system frequency sensitivity function, the dynamic response system steady-state frequency requirement, the wind turbine is introduced into the wind farm virtual weight coefficient after the primary unit of the synchronous unit, and the stratified and step-by-step normal operation mode is provided to provide the transient/stable for the grid. Dual frequency support at full time scale. Based on PSCAD software, a robust integrated frequency control hardware-in-the-loop simulation platform is built to verify the correctness of the proposed method and analysis conclusions.

摘要

现有的虚拟惯量控制增加了系统的转动惯量，有利于减少短期频率下降，但对稳态频率没有支撑作用，风扇在运行过程中容易造成系统负功率渗透。放电后动能的恢复，产生了两倍的频率。坍塌。为实现高磁导率风电下电网暂态和稳态频率的暂态控制性能，构建了具有虚拟惯性支持和稳态频率二次支持的鲁棒集成频率响应模型。该模型包括具有高风穿透率的风火。捆绑式直流送电系统和500 kV 大型风电场输电网，通过系统频率变化率控制风机在不同时间尺度的功率贡献。附加频率辅助控制策略建立了风扇的风速和虚拟惯量。系数与系统频率灵敏度函数的关系，动态响应系统稳态频率要求，风电机组在同步机组初级后引入风场虚拟权重系数，分层逐级提供阶跃正常运行模式，为电网提供瞬态/稳定。全时标双频支持。基于PSCAD软件，