Photovoltaic-integrated power generation systems feature random and intermittent power generation susceptible to external environment which easily causes DC-side power fluctuations and results in unstable power input of inverters.In view of this,the present work made an attempt at using hybrid energy storage system of batteries and supercapacitors for power compensation to maintain equilibrium with the grid-connected power supply.In order to prevent supercapacitors from overcharge and overdischarge and harming the system's safe operation,a power allocation strategy considering the state of charge(SOC)of supercapacitors was proposed,which adopts linear active disturbance-tolerant(LADRC)double closed-loop control.Simulation results showed that the strategy facilitates addressing the unstable output power of grid-connected inverter and prevents overcharge and overdischarge of supercapacitors,thereby is conducive to the systems'safe operation.
关键词
光伏并网/混合储能/功率分配/线性自抗扰
Key words
photovoltaic integration/hybrid energy storage/power allocation/linear active disturbance tolerance
维普
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