Novel off-grid/grid-connected integrated solar power generation system and control method

Abstract

The invention provides a novel off-grid / grid-connected integrated solar power generation system. The solar power generation system can meet the requirements of a user on the off-grid or grid-connected running of a solar energy power system, and also has the capability of realizing the multifunctional application of storing and backing up the peak power of an external power grid. The solar power generation system is characterized in that: a control system of the solar power generation system controls the solar power generation system to run in any mode such as an off-grid mode, a grid-connected mode and the like. The invention also provides a control method for the solar power generation system. The control method comprises the following steps that: a system operating mode manager selects the off-grid operating mode or the grid-connected operating mode of the system, and a logic control unit controls the working conditions of a power input orientation driver, a power generation and energy storage driver and a power output orientation driver according to the power load condition feedback of a solar panel, an inverter, a storage battery charging controller and a storage battery matrix, thereby realizing the running of solar energy power-based charging energy storage and power generation output of the whole solar power generation system in the operating mode such as the off-grid operating mode, the grid-connected operating mode and the like.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to a novel off-grid / grid-connected integrated solar power generation system and a control method. Background technique [0002] Existing solar power generation systems can generally be divided into solar off-grid power generation systems and solar grid-connected power generation systems. In the existing solar off-grid power generation systems, the power storage circuit 8 and the power generation circuit 9 form an inverted π open loop like structure (see figure 1 ), the solar panel 1 converts solar energy into electrical energy, and then charges the storage battery 5 through the DC solar charging controller 6, and the electrical energy stored in the storage battery 5 is converted from DC to AC by the inverter 6 and then supplied to the user. The disadvantages are: Its structure and function are single, and it can only provide a single mode of power supply to a single ...

AI Technical Summary

Problems solved by technology

[0002] Existing solar power generation systems can generally be divided into solar off-grid power generation systems and solar grid-connected power generation systems. In the existing solar off-grid power generation systems, the power storage circuit 8 and the power generation circuit 9 form an inverted π open loop like structure (see figure 1 ), the solar panel 1 converts solar energy into electrical energy, and then charges the storage battery 5 through the DC solar charging controller 6, and the electrical energy stored in the storage battery 5 is converted from DC to AC by the inverter 6 and then supplied to the user. The disadvantages are: Its structure and function are single, and it can only provide a single mode of power supply to a single independent user. The utilization rate of its solar power and system hardware resources is low, and it cannot meet the needs of users for multi-functional use of solar power systems, nor can it meet the needs of users for emergency backup energy. It is more difficult to meet the needs of users to supplement the power shortage of the local power grid and to provide supplementary support during the low-power period of the local power grid; in addition, the traditional solar off-grid power generation system uses an expensive PLC system7. System control, the cost of the control system is high; while the existing solar grid-connected power generation system only directly inverts the electric energy generated by the solar panel into the grid, but it cannot be directly used by the user, let alone the system does not have sunlight power generation function

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