【摘要】 储能虚拟同步发电机(Virtual Synchronous Generators,VSG)是解决高渗透率新能源并网的有效方式。由于外部电网的影响,激发LC型储能虚拟同步发电机滤波电路振荡,造成储能虚拟同步发电机并网时出现谐波谐振,产生谐振风险。文章根据LC型储能虚拟同步发电机并网系统控制策略,建立并网系统控制模型,通过数学模型深入分析不同电网参数影响下的储能并网系统,发现谐波谐振主要与网侧环节有关。为抑制谐波谐振,引入虚拟阻抗算法,提出储能VSG新型阻尼控制策略。通过建立Matlab/Simulink仿真模型,验证了储能VSG中存在谐波谐振现象及所提阻尼控制策略的有效性。更多还原

【Abstract】 Control strategy of energy storage virtual synchronous generator is one of the effective strategies to solve the grid-connected problem of new energy with high permeability. However, due to the influence of net side links, the resonance of the inverter circuit is excited, which leads to the high frequency resonance and the high frequency resonance risk when the inverter is connected to the grid. In this paper, according to the existing control strategy of grid-connected energy storage virtual synchronous machine, a control model of grid-connected system is established. By constructing a closed-loop mathematical model, the control strategy of existing energy storage grid-connected synchronous system is deeply analyzed under different grid parameters. Found that the high frequency resonance is mainly related to the network side. In order to restrain the high frequency resonance, this paper introduces the virtual impedance algorithm based on the control strategy of the existing energy storage synchronous machine and proposes a new damping control strategy of energy storage VSG. Finally, Matlab/Simulink simulation model is established to verify the existence of high frequency resonance in energy storage VSG and the effectiveness of the proposed damping strategy.更多还原