储能VSG并联组网系统的有功振荡特性分析及其改进策略

储能虚拟同步机(VSG)通过模拟同步发电机的转子运动方程，使得储能变换器具备一定的惯量支撑能力，但不可避免地引入有功动态振荡等问题，特别是在储能VSG并联组网系统(ESVPNS)中该问题更为突出。为此提出一种抑制ESVPNS有功动态振荡的有功前馈补偿改进控制策略，利用包含虚拟惯量与一次调频参数的一阶低通滤波环节构造有功前馈项，通过调节前馈参数提升ESVPNS抑制有功动态振荡的能力，在既不依赖通信又无需微分运算的前提下，不影响ESVPNS有功的稳态均分效果。建立包含有功前馈环节的ESVPNS小信号数学模型，并详细给出前馈参数的设计过程。MATLAB/Simulink仿真对比结果验证了所提控制策略的有效性与优越性。

Analysis and improvement strategy of active power oscillation characteristics for energy storage VSG parallel networking system

The energy storage virtual synchronous generator(VSG) makes the energy storage converter have a certain inertia support capacity by simulating the rotor motion equation of the synchronous generator. However, the problem of active power dynamic oscillation is inevitably introduced, especially in the energy storage VSG parallel networking system(ESVPNS). In issue of this, an improved active power feedforward compensation control strategy of suppressing the ESVPNS active power oscillation is proposed. The active power feedforward term is constructed by using the first order low pass filtering link containing virtual inertia and primary frequency modulation parameters of the energy storage VSG, and the ability to suppress the ESVPNS active power dynamic oscillation is improved by adjusting the feedforward parameter. Meanwhile, the steady state equipartition effect of the ESVPNS active power is not affected under the premise of neither communication nor differential operation. The ESVPNS small signal mathematical model with the active power feedforward control strategy is established, and the design process of the feedforward parameter is given in detail. MATLAB/Simulink simulative comparative results verify the effectiveness and supe-riority of the proposed control strategy.