光伏并网中混合储能自适应VSG协调控制策略研究OA

With the large-scale integration of photovoltaic(PV)generation,its inherent intermittency and fluctuations pose severe challenges to power system stability.To address this issue,a coordinated control strategy for hybrid energy storage based on flywheels and lithium-ion batteries is proposed.A Moving Average Filter(MAF)that incorporates the State of Charge(SOC)of the storage system is adopted to achieve rational power allocation,where the flywheel is primarily responsible for rapid response to high-frequency fluctuations,while the lithium battery is employed to mitigate low-frequency fluctuations.Furthermore,an adaptive virtual synchronous generator(VSG)control is integrated to dynamically adjust the virtual inertia and damping coefficients,thereby enhancing the system's frequency response and power-tracking performance.Simulation results demonstrate that the proposed strategy effectively compensates PV power deficits,reduces power and frequency overshoot during disturbances,shortens regulation time,and mitigates grid-connected current fluctuations,thus verifying its effectiveness in improving grid stability.