Photovoltaic grid-connected power station stair type adjustment inversion power device

Abstract

A photovoltaic grid-connected power station stair type adjustment inversion power device is disclosed and belongs to the technical field of solar photovoltaic power generation. The invention particularly relates to a photovoltaic grid-connected power station stair type adjustment inversion power device. The invention provides the photovoltaic grid-connected power station stair type adjustment inversion power device which comprises an illumination intensity detecting circuit, an inverter communication circuit, a relay control circuit, a press key circuit, a liquid crystal display screen circuitand a central processing circuit. Structural key points of the photovoltaic grid-connected power station stair type adjustment inversion power device are that a signal output port of the illuminationintensity detecting circuit is connected to a signal input port of the central processing circuit. The signal transmission port of the inverter communication circuit is connected to a signal transmission port of the central processing circuit and a signal transmission port of a grid-connected inverter, a control signal output port of the central processing circuit is connected to the control signal input port of the relay control circuit and the control signal output port of the button circuit is connected to a control signal input port of the central processing circuit.

Description

technical field [0001] The patent of the invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a photovoltaic grid-connected power station step regulation inverter power device. Background technique [0002] The electrical structure of a photovoltaic grid-connected power generation system is usually a photovoltaic array of a certain capacity matched with a grid-connected inverter of a corresponding capacity for power generation. For example, a photovoltaic array with a capacity of 50kWp generally matches a grid-connected inverter with a rated power of 50kW Transformer. The advantage of this system is that the electrical structure is simple and the design cycle is short. However, this system has the following problems. In many cases, the light intensity received by the photovoltaic array is low, including: (1) The impact of meteorological conditions. The influence of impurities in the medium is reflected, refracted, sc...

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Problems solved by technology

Since the inverter efficiency of the grid-connected inverter will be greatly reduced in the low-load range, the inverter efficiency of the entire photovoltaic grid-connected system will be greatly reduced, and the power generation will be directly reduced.

In addition, since the operating power loss of the grid-connected inverter increases with the power level of the grid-connected inverter, for example, the operating power loss of an inverter with a rated power of 50kW is equivalent to the operating power loss of five 10kW inverters. When the input power of the photovoltaic array is low, the inverter with a larger rated power is still used, which will cause a lot of energy to be wasted in the operating power loss of the inverter

At present, judging from the research reports and related reports at home and abroad, there is still a lack of effective solutions.

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