Photovoltaic-energy storing joint power generation system

Abstract

The invention discloses a photovoltaic-energy storing joint power generation system, which comprises a photovoltaic device and an energy storing device, wherein the photovoltaic device is connected with the power grid for converting solar energy to AC with the same frequency and the same phase as the power grid and the AC is transmitted to the power grid; the energy storing device is connected with the power grid and has a charging mode and a discharging mode; when the energy storing device is in the charging mode, the energy storing device acquires the AC from the power grid, the AC of the power grid is converted to DC and the DC is stored; when the energy storing device is in the discharging mode, the energy storing device converts the self-stored DC to the AC with the same frequency and the same phase as the power grid, and the AC is transmitted to the power grid; and the energy storing device is also connected with the photovoltaic device for monitoring working states of the photovoltaic device and the power grid, and the self working mode is switched according to the monitoring result. The photovoltaic-energy storing joint power generation system and the power grid are matched for power generation in the peak period of electricity consumption, purposes of achieving smooth photovoltaic output power and peeling peak and filling valley can be realized, and stable operation of the power grid and balance of power supply and power use are ensured.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic storage combined power generation system. Background technique [0002] It is an urgent need for the sustainable and healthy development of human society to seek new energy sources and realize clean, pollution-free and renewable power generation. As a kind of renewable energy, solar energy has the advantages of abundant resources, convenient development, clean and pollution-free. As the main application form of solar power generation, photovoltaic power generation has become an important power generation technology. [0003] At present, the output power of photovoltaic power generation is unstable and unpredictable. After the photovoltaic power generation system is connected to the grid, it will affect the power quality and safe and stable operation of the power system. In addition, as user load continues to increase, and load fluctuations w...

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention proposes a photovoltaic-storage combined power generation system, which mainly solves the problem of unstable and uncontrollable output power of photovoltaic power generation

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