计及微电网黑启动的虚拟同步发电机调频策略

针对虚拟同步发电机(Virtual Synchronous Generator, VSG)控制策略应用到微电网调频过程中存在次振荡周期的问题,提出一种双阈值-全程自适应频率控制策略。该控制策略综合了自适应模型与负转动惯量的特性,建立了新的转动惯量函数模型,弱化了阻尼项的影响,在消除频率暂态过程次振荡周期的同时,简化了控制结构。为解决现有单一控制策略难以适用于微电网黑启动问题,在不影响微电网启动速度的前提下引入零起升压环节,将该控制策略的应用范围扩大到微电网黑启动过程。仿真和实验验证了所提控制策略的正确性和有效性。

Frequency regulation strategy of a virtual synchronous generator-based microgrid considering the black start process

Considering the secondary oscillation period when a Virtual Synchronous Generator (VSG) is applied to microgrid frequency modulation, a double threshold-full adaptive frequency control strategy is proposed. The control strategy combines the adaptive model and the characteristics of negative inertia, establishes inertia of the new function model, and weakens the effect of damping. It simplifies the control structure while eliminating the secondary oscillation period of the frequency transient process. In order to solve the problem that the existing single control strategy is not suitable for the black start of a microgrid, a zero start and boost link is introduced on the premise of not affecting the start speed of the microgrid. This extends the application scope of this control strategy to the black start process of a microgrid. Simulation and experiment validate the correctness and effectiveness of the proposed method. This work is supported by National Natural Science Foundation of China (No. 51974151) and Fund Program of Liaoning Provincial Key Laboratory (No. LJZ003).