Intelligent control scheme for solving morning-evening frequent starting of photovoltaic grid-connected inverter

Abstract

The invention relates to an intelligent control scheme for solving morning-evening frequent starting of a photovoltaic grid-connected inverter. An auxiliary power supply unit, a control assembly and a startup delay starting unit are arranged. The startup delay starting unit is connected to the control assembly and a direct-current power supply unit; the auxiliary power supply unit is connected to the control assembly and the direct-current power supply unit; and the control assembly is also connected to the direct-current power supply unit and a power grid. The startup delay starting unit determines the output voltage of the direct-current power supply unit; when the output voltage is lower than a predetermined first voltage value, the electric energy of the direct-current power supply unit is consumed, thereby avoiding starting of the auxiliary power supply unit; and when the output voltage is higher than the predetermined first voltage value, the startup delay starting unit stops consumption of the electric energy of the direct-current power supply unit and the control assembly maintains the starting state of the auxiliary power supply unit. With the control circuit, when the energy outputted by the direct-current power supply unit is deficient, wrong starting of the auxiliary power supply unit can be avoided by the delay starting device, thereby improving the system stability.

Description

technical field

[0001] The invention relates to the technical field of control of electronic circuits, in particular to a power electronic control device in inverter equipment. Background technique

[0002] Devices such as solar panels collect solar energy and convert it into electrical energy, and transmit the electrical energy to the grid. In the process, an inverter device that converts DC to AC is required, generally known as a photovoltaic grid-connected inverter. Solar energy has the characteristics of time fluctuations. For example, when the sun is strong at noon, the energy is sufficient, but when the sun energy is scarce in the morning or evening, the DC voltage output by the solar panel is falsely high, but the energy is very low; resulting in the photovoltaic grid-connected inverter The voltage of the auxiliary power unit is falsely high, and the energy is insufficient after the auxiliary power unit is started, causing the auxiliary power unit to stop working. Suc...

Examples

Embodiment Construction

[0021] In order to facilitate the understanding of those skilled in the art, the technical solution of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0022] Detailed exemplary embodiments are disclosed herein. However, specific structural and functional details disclosed herein are for purposes of describing example embodiments only. Example embodiments may, however, be embodied in many alternate forms and should not be construed as limited to only the example embodiments set forth herein.

[0023] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure. In the description of the drawings, like reference numerals refer to like elements.

[0024] It will be understood that although the terms ...

technical field

[0001] The invention relates to the technical field of control of electronic circuits, in particular to a power electronic control device in inverter equipment. Background technique

[0002] Devices such as solar panels collect solar energy and convert it into electrical energy, and transmit the electrical energy to the grid. In the process, an inverter device that converts DC to AC is required, generally known as a photovoltaic grid-connected inverter. Solar energy has the characteristics of time fluctuations. For example, when the sun is strong at noon, the energy is sufficient, but when the sun energy is scarce in the morning or evening, the DC voltage output by the solar panel is falsely high, but the energy is very low; resulting in the photovoltaic grid-connected inverter The voltage of the auxiliary power unit is falsely high, and the energy is insufficient after the auxiliary power unit is started, causing the auxiliary power unit to stop working. Suc...

Examples

Embodiment Construction

[0021] In order to facilitate the understanding of those skilled in the art, the technical solution of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0022] Detailed exemplary embodiments are disclosed herein. However, specific structural and functional details disclosed herein are for purposes of describing example embodiments only. Example embodiments may, however, be embodied in many alternate forms and should not be construed as limited to only the example embodiments set forth herein.

[0023] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure. In the description of the drawings, like reference numerals refer to like elements.

[0024] It will be understood that although the terms ...

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