在电力系统的并网过程中,电压幅值、频率和相角的突变常常引发系统合闸冲击,从而降低整个系统的并网稳定性.为应对这一挑战,在虚拟同步机(virtual synchronous generator,VSG)控制的有功和无功环中引入线性自抗扰控制器(linear active disturbance rejection control,LADRC)来改进预同步控制策略.该策略旨在优化电力系统并网中因电压幅值和频率相角不同步而导致的冲击和不稳定现象,减少系统波动.利用LADRC替代传统VSG预同步控制策略频率和电压调节器中的PI控制,综合考虑VSG有功-频率和电压-无功环节,实现对电网电压参数的精准跟踪和调节,同时有效降低并网合闸冲击的风险,使并网过程更平滑.
Application of Linear Self-Immunity to the Pre-Synchronization Control of Virtual Synchronous Generators
In the grid-connection process of a power system,sudden changes in voltage magnitude,frequency and phase angle often trigger system closing shocks,thus reducing the grid stability of the whole system.To meet this challenge,linear active disturbance rejection control(LADRC)is introduced into both the active and reactive rings of the virtual synchronous generator(VSG)control to enhance the pre-synchronization control strategy.This strategy aims to optimize the shocks and instabilities caused by the unsynchronized voltage magnitude and frequency phase angle in the grid-connected power system and to reduce the system fluctuations.The adoption of linear active disturbance rejection control(LADRC)in this paper serves as an alternative to the conventional PI control for regulating frequency and voltage within the traditional VSG pre-synchronization control strategy,taking into account the active-frequency and voltage-reactive links of the VSG,to achieve accurate tracking and regulation of the grid voltage parameters,and at the same time,effectively reduces the risk of the grid-connection closing shock and makes the grid-connection process smoother.
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