Virtual synchronous power generation characteristics-based optical storage integration control system

Abstract

The invention relates to a virtual synchronous power generation characteristics-based optical storage integration control system. Power generation units are sequentially connected with a DC conversion unit and an AC conversion unit; a measurement unit is connected with a connection line between the power generation units and the DC conversion unit, the connection line between the DC conversion unit and the AC conversion unit, the connection line between the AC conversion unit and a power transmission line and an optical storage integration control unit; the optical storage integration control unit is connected with a control process unit and a virtual synchronous power generation control unit; the control process unit is connected with the DC conversion unit; and the virtual synchronous power generation control unit is connected with the AC conversion unit. According to the system provided by the invention, in a manner of collecting photovoltaic power generation units and energy storage power generation units at a DC side, the operation reliability of the system is improved; the system is connected to a power grid in a virtual synchronous power generation characteristics control manner; the voltage and the frequency of the system are quickly supported when the power grid is disconnected; and the power supply reliability of the optical storage integration control system is improved.

Description

technical field [0001] The invention relates to the field of IP address positioning, in particular to an optical-storage integrated control system based on the characteristics of virtual synchronous power generation. Background technique [0002] As the penetration rate of renewable energy grid-connected power generation systems in the power system continues to increase, new energy power generation has an increasing impact on grid operation. Distributed photovoltaic power generation is distributed in multiple locations, and its output is unstable. At the same time, it is connected to the distribution network with low voltage and small capacity. question. The energy storage system can effectively solve a series of problems caused by distributed photovoltaic power generation: by quickly adjusting the active and reactive output of the energy storage system, the power fluctuation of photovoltaic power generation can be compensated, and the problem of voltage fluctuation at the ...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign solar-storage integrated systems are mainly connected in parallel on the AC side. The photovoltaic power generation and energy storage systems work in MPPT mode and PQ control respectively. This control mode can only control the stable output of active and reactive power, and cannot control the voltage of the grid. Frequency changes are effectively supported, and the speed of switching to the independent power supply mode is slow when the grid is disconnected, which often causes the photovoltaic power generation system to be disconnected from the grid and affects the reliability of power supply

At present, there are some domestic studies on the integration of photovoltaics and energy storage on the DC side, but all of them focus on the maximum power generation of photovoltaics, lack of support research on grid voltage and frequency changes, and large-area access under high penetration rates will be Affects the power supply quality of the grid

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