A photovoltaic grid-connected power inverter ladder controller

Abstract

A photovoltaic grid-connected inverter power ladder controller belongs to the technical field of solar photovoltaic power generation, in particular to a photovoltaic grid-connected inverter power ladder controller. The invention provides a photovoltaic grid-connected power generation inverter power ladder controller comprising a light intensity detection circuit Inverter Communication Circuit, Relay Control Circuit, key circuit, A liquid crystal display circuit and a central processing circuit, the signal output port of the illumination intensity detecting circuit is connected with the signalinput port of the central processing circuit, the signal transmission port of the inverter communication circuit and the signal transmission port of the central processing circuit, The signal transmission port of the grid-connected inverter is connected, the control signal output port of the central processing circuit is connected with the control signal input port of the relay control circuit, and the control signal output port of the key circuit is connected with the 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 particularly relates to a photovoltaic grid-connected power generation inverter power ladder controller. Background technique [0002] The electrical structure of a photovoltaic grid-connected power generation system is usually a photovoltaic array with a certain capacity matched with a grid-connected inverter of a corresponding capacity to generate power. For example, a photovoltaic array with a capacity of 50kWp is generally matched with a grid-connected inverter with a rated power of 50kW. transformer. The advantages of this system are simple electrical structure and short design cycle. However, this system has the following problems. In many cases, the light intensity received by the photovoltaic array is low, including: (1) Influenced by meteorological conditions, in the environment of dust, haze, cloudy and rainy days, the sunlight is affected ...

AI Technical Summary

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.

Images