基于Hamilton系统方法的VSG控制研究

The Analysis of VSG Control Algorithm Based on Hamiltonian System

由于分布式电源的输出功率间歇性和波动性,传统电力电子逆变设备的低惯性和欠阻尼特性可能对电网稳定性带来不利影响,为了提高系统维持稳定性和抑制振荡所需的惯性和阻尼,利用考虑汽门与励磁协调控制的三阶同步发电机模型,设计了基于耗散Hamilton能量控制的虚拟同步发电机控制。并将ADRC技术运用到虚拟同步发电机控制中来消除控制系统内部的电压电流控制耦合项。最后,利用Dig SILENT/Power Factory仿真软件仿真分析并验证了所提的控制算法可以明显提高系统鲁棒性、抑制振荡、提供虚拟惯性和正阻尼以及消除参数摄动和耦合。

Due to the intermittence and fluctuation of the output power of the distributed generations, the low inertia and under-damping characteristics of traditional electronic inverters may bring negative effects to the power system stability. In order to provide suitable inertia and damping ratio to suppress the oscillation of the power system, a virtual synchronous generator control algorithm based on dissipative Hamilton control was designed in this paper by using the third-order synchronous generator model with the consideration of valve and excitation. And ADRC technology was applied to eliminate the coupling in the voltage and current control system. Finally the proposed control algorithm was verified by simulation results based on DIgSILENT/PowerFactory. The results show that the proposed control algorithm can significantly improve the robustness of the system, suppress the oscillation, provide virtual inertia and positive damping ratio, and eliminate the perturbation and coupling of parameters.