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Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method

A photovoltaic power generation system and off-grid technology, applied in photovoltaic power generation, collectors, battery circuit devices, etc., can solve the problems of lack of continuous and controllable power supply, difficulty in realizing optimal management of storage batteries, etc., to ensure uninterrupted power supply and improve power supply The effect of improving reliability and utilization

Inactive Publication Date: 2014-01-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

However, in this type of off-grid system, due to the lack of a truly continuous and controllable power source in the system, it is difficult to achieve optimal management of the battery

Method used

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  • Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method
  • Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method
  • Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method

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specific Embodiment

[0044] For preliminarily illustrating the correctness and feasibility of the present invention, take a group of direct voltage boosting circuits as an example (as attached Figure 7 As shown), the system is simulated and verified, and the simulation results are shown in the attached Figure 8 shown.

[0045] Before 0.2 seconds, the system was working in off-grid mode, and the photovoltaic and storage batteries jointly supplied power to the local load (5kW purely resistive). At this time, the inverter works in v / f mode to provide a stable reference voltage for the AC bus. In 0.2 seconds, the inverter completes phase pre-synchronization, the PCC grid-connected switch is closed, and the system changes from off-grid operation to grid-connected operation. Near the switching point, the working state of the battery remains unchanged. When the switching process is completed and after a period of stable operation (set to 0.1 second in this embodiment), the constant current charging ...

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Abstract

The invention discloses a photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and a control method, which can realize storage and conversion of renewable energy sources such as solar energy to electric energy and meanwhile have gird-connected and off-grid power supply functions. The structure comprises a photovoltaic component, a direct current-direct current booster circuit, a three-phase inverter circuit, an isolating transformer, a PCC (Programmable Computer Controller) grid-connected switch, a local load and the like. According to the control method, seamless switching between grid-connected / off-grid working modes of the system can be realized, and stepless regulation of output power of photovoltaic batteries and optimal management of accumulators can also be realized. Compared with the conventional photovoltaic grid-connected inverter, the photovoltaic power generation system has the prominent advantages of simple structure, rich function, high power supply reliability and the like, contributes to improving the utilization efficiency of renewable energy resources for power generation and has excellent application and generalization prospect.

Description

technical field [0001] The invention relates to a system structure and control method in the technical field of photovoltaic power generation, which can realize the conversion and storage of solar energy into electric energy, and has two power supply modes of grid-connected and off-grid. technical background [0002] With the gradual depletion of conventional energy, the increasingly prominent problem of environmental pollution and the advancement of global power market reforms, distributed power generation technologies based on renewable energy such as solar energy and wind energy have received more and more attention and attention. According to statistics, in 2011, the global newly installed photovoltaic capacity was about 27.79GW, compared with 17.5GW in 2010, an increase of 62%. However, my country's installed capacity of photovoltaic power generation systems in 2011 only accounted for about 7% of the world's total, which is incongruous compared with the world's largest ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/35H02J3/38H02J3/32
CPCY02A30/60Y02E10/56Y02E70/30
Inventor 陈杰陈新龚春英严仰光薛济萍薛群山冯志阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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