含储能的两级光伏功率振荡抑制策略研究

Research on power oscillation suppression strategy of two-stage photovoltaic with energy storage

功率振荡一直是电力系统亟待解决的稳定性问题,研究含储能的大容量光伏并网抑制电力系统功率振荡与当下能源发展方向相符。首先建立含储能的两级光伏并网模型,设计抑制功率振荡的控制策略,同时采用阻尼转矩分析推导该控制策略对系统阻尼影响的物理意义,以特征值法分析复杂的多机系统。搭建含储能的两级光伏并入单机和多机系统仿真模型,采用时域仿真和特征分析,验证了控制策略抑制功率振荡的有效性,在多机系统中对目标机组振荡抑制效果更明显,有效提高了系统的稳定性。

Power oscillation has always been a stability issue that needs to be solved in power systems.Study on large scale photovoltaic(PV)with energy storage suppresses power system power oscillations conforms to the current development direction of energy.Firstly,the model of two-stage PV with energy storage grid-connected is established,and then,the control strategy to suppress power oscillation is designed.The physical significance of the control strategy influencing the damping is derived through using the damping torque analysis,and complex multi-machine system is analyzed through using eigenvalue analysis.The simulation model of two-stage PV with energy storage connecting to single machine and multi-machine system is built.The effectiveness of control strategy to suppress power oscillation is verified by time domain simulation and eigenvalue analysis.In multi-machine system,the effect of objective unit oscillation suppression is more obvious.The stability of the system is effectively improved.