| With the continuous promotion of the national "dual carbon" strategy,the installed capacity and penetration rate of photovoltaic power generation in the power system have been increasing year by year.On the one hand,the intermittency,randomness,and volatility of photovoltaic power generation output will inevitably have an impact on the safe and stable operation of the power grid,increasing the demand for flexible regulation of the system;On the other hand,photovoltaic power generation uses power electronic inverters as grid connected interface devices,which do not have the damping and inertia characteristics of conventional rotary synchronous generator sets.Therefore,the synchronous support capability of the power system under high penetration photovoltaic access will be significantly weakened.Therefore,this article aims to utilize multi-point distributed battery energy storage control technology to enhance the flexible adjustment ability of the power system and ensure the safe and stable operation of the power system under high penetration photovoltaic access.The main content of this article is as follows:(1)Transient modeling of photovoltaic power generation system and analysis of its impact on the power grid: Based on the simulation requirements of power system security and stability analysis,establish a transient simulation model for photovoltaic power generation systems,including photovoltaic arrays,photovoltaic grid connected inverters,and other conventional equipment components.Considering the frequency,voltage,and other security and stability constraints of the power system,simulate and analyze the impact of high penetration photovoltaic access on the security and stability of the power system.On this basis,analyze the regulatory capabilities of flexible resources in power systems such as thermal power units,battery energy storage,and flexible loads at different time scales.(2)Research on virtual synchronous control strategy for battery energy storage system: Based on the typical architecture of a battery energy storage system,model the battery energy storage body and inverter,and study the working principle and control mode of the grid connected inverter of the battery energy storage system on this basis.Secondly,by comprehensively analyzing the PQ and virtual synchronization control strategies of the energy storage grid connected converter,a virtual synchronization control strategy suitable for battery energy storage systems is proposed,which enables the battery energy storage system to have certain synchronization support capabilities.An example system is built on simulation software to verify the effectiveness of the virtual synchronization control strategy.(3)Research on distributed energy storage control strategy based on multi-agent collaboration:Firstly,based on the virtual synchronization control strategy,establish a single station optical storage system control mode;Secondly,propose an active power allocation control strategy with equal state of charge,and then establish a cluster based optical storage system control mode;Based on the research on the control modes of single station and cluster optical storage systems,a multi-agent energy storage collaborative control strategy is further proposed.On the one hand,this strategy is based on the virtual synchronization control function of the battery energy storage system,which timely responds to system disturbances and achieves active control and support;On the other hand,based on the multi-agent collaborative control strategy and particle swarm optimization algorithm,a collaborative optimization control that takes into account the differences in the distributed energy storage states of multiple points has been achieved,and the feasibility and effectiveness of the above strategy have been verified in simulation software. |
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