A photovoltaic control module for outputting constant voltage direct current

Abstract

The utility model relates to the field of photovoltaic power generation technology, and specifically, to a photovoltaic control module that outputs constant voltage direct current, including a photovoltaic input unit, an electric energy conversion unit, and an electric energy output unit. In the utility model, the photovoltaic input unit receives and manages the electric energy output by the photovoltaic module, and then the energy storage management component temporarily stores or releases the electric energy. The released electric energy is processed in two ways, one of which is converted from DC to AC through an electric energy inverter component and then incorporated into the power grid, and the other is converted from DC to AC to DC through an electric energy inverter component and then outputs constant voltage direct current to power local equipment loads, supplying stable electric energy, thereby ensuring the normal operation of the equipment loads.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic control module for outputting constant voltage direct current. Background Art

[0002] Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor interfaces to directly convert light energy into electrical energy. It is mainly composed of three parts: solar panels, controllers and inverters. Photovoltaic power generation systems can convert solar energy into electrical energy, thereby reducing dependence on traditional grid power and reducing electricity bills. In the case of long-term use, photovoltaic power generation systems can help families or businesses save a lot of electricity bills.

[0003] For example, CN104578171B involves a control method for a DC photovoltaic power generation module, including firstly using a photovoltaic power generation system composed of a DC photovoltaic power generation module, a GPRS module, a DC bus, an inverter, and an AC power grid, connecting all the DC photovoltaic power generation modules in parallel as basic units, and connecting them to the DC bus, and at the same time dividing all the DC photovoltaic power generation modules into several groups, each group containing n DC photovoltaic power generation modules and a GPRS module, and realizing wireless communication with a host computer; secondly, fault detection and judgment are performed according to the output voltage of the photovoltaic module and the output power of the DC photovoltaic power generation module; finally, the working state of each DC photovoltaic power generation module is determined according to the DC bus voltage. This invention mainly solves the hot spot effect formed by shadows, etc., and realizes the maximum power generation efficiency, but does not adjust the power output of the photovoltaic module, that is, the problem of different output power of the photovoltaic module due to changes in light intensity, which will affect the normal operation of the equipment load that uses the power output of the photovoltaic module as the power source.

[0004] In order to ensure that photovoltaic modules can supply stable electric energy, a photovoltaic control module that outputs constant voltage direct current is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a photovoltaic control module for outputting constant voltage direct current to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides a photovoltaic control module for outputting constant voltage direct current, comprising a photovoltaic input unit, an electric energy conversion unit and an electric energy output unit, wherein the electric energy conversion unit comprises an energy storage management component and an electric energy inverter component, wherein the photovoltaic input unit is connected to the energy storage management component, the energy storage management component is connected to the electric energy inverter component, and the electric energy inverter component is connected to the electric energy output unit;

[0007] The electric energy output by the photovoltaic component is transmitted to the electric energy conversion unit through the photovoltaic input unit, the energy storage management component temporarily stores the input electric energy, and after the direct current input by the photovoltaic component is converted by the electric energy inverter component, constant voltage direct current is output through the electric energy output unit.

[0008] As a further improvement of the present technical solution, the photovoltaic input unit includes multiple power input components and a pre-processing component connected to the power input component. The power input component is connected to the photovoltaic component accordingly. The power input component is used to receive the direct current output by the photovoltaic component. The pre-processing component is connected to the energy storage management component.

[0009] As a further improvement of the technical solution, the power inverter assembly includes a power inverter circuit and a constant voltage rectifier circuit connected to the power inverter circuit, wherein the power inverter circuit includes a transformer T1 and transistors VT1 and VT2.

[0010] The base of the transistor VT1 is connected to the cathode of the diode D1, the collector of the transistor VT1 is connected to the main winding of the transformer T1, the emitter of the transistor VT1 is connected to the emitter of the transistor VT2, the anode of the diode D2, the anode of the diode D1, the resistor R2 and the fuse F, and the collector of the transistor VT2 is connected to the main winding of the transformer T1;

[0011] The resistor R2 is connected to the resistor R1 and connected to the cathode of the diode D1 and the cathode of the diode D2. The resistor R1 is connected to the potentiometer VR1 and connected to the main winding of the transformer T1. The potentiometer VR1 and the fuse F are both connected to the energy storage management component.

[0012] The secondary winding of the transformer T1 is connected in parallel with a capacitor Co.

[0013] As a further improvement of the technical solution, the constant voltage rectifier circuit includes a transformer T2 and a rectifier bridge BG connected to the secondary winding of the transformer T2, wherein:

[0014] The primary winding of the transformer T2 is connected to the secondary winding of the transformer T1;

[0015] One end of the rectifier bridge BG is connected to the resistor R5 and the capacitor C1, and the other end of the rectifier bridge BG is connected to the positive electrode of the voltage regulator diode VD and the capacitor C2 and the other end of the capacitor C1;

[0016] The resistor R5 is connected to the cathode of the voltage stabilizing diode VD and is also connected to the other end of the capacitor C2.

[0017] As a further improvement of the present technical solution, the electric energy output unit includes a first output component, a second output component and a grid-connected component, the electric energy inverter circuit is connected to the first output component, the first output component is connected to the grid-connected component, and the constant voltage rectifier circuit is connected to the second output component.

[0018] As a further improvement of the technical solution, the first output component is provided with an inverter and a smart meter connected to the inverter.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. In the photovoltaic control module that outputs constant voltage direct current, the photovoltaic input unit receives and manages the electric energy output by the photovoltaic module, and then the energy storage management component temporarily stores or releases the electric energy. The released electric energy is processed in two ways, one of which is converted from DC to AC through the power inverter component and then connected to the power grid, and the other is converted from DC to AC to DC through the power inverter component and then outputs constant voltage direct current to power the local equipment load, supplying stable electric energy, thereby ensuring the normal operation of the equipment load.

[0021] 2. In the photovoltaic control module that outputs constant voltage direct current, the alternating current generated by the power inverter circuit is boosted by the inverter and then connected to the grid through the grid-connected components. The smart meter feeds back the detected grid access point data to the inverter, and the inverter dynamically adjusts the inverter output power. When the grid power is sufficient, the inverter stops boosting and no longer transmits power to the grid through the grid-connected components, which can avoid the deterioration of power quality caused by excessive grid power. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is the electric energy inverter circuit diagram of the utility model;

[0024] Figure 3 This is a constant voltage rectification circuit diagram of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] See also Figure 1-Figure 3 As shown, this embodiment provides a photovoltaic control module for outputting constant voltage direct current, including a photovoltaic input unit, an electric energy conversion unit and an electric energy output unit, the electric energy conversion unit includes an energy storage management component and an electric energy inverter component, the photovoltaic input unit is connected to the energy storage management component, the energy storage management component is connected to the electric energy inverter component, and the electric energy inverter component is connected to the electric energy output unit;

[0028] The electric energy output by the photovoltaic module is transmitted to the electric energy conversion unit through the photovoltaic input unit. The energy storage management component temporarily stores the input electric energy, and converts the direct current input by the photovoltaic module through the electric energy inverter component, and then outputs constant voltage direct current through the electric energy output unit.

[0029] Principle: The photovoltaic input unit receives and manages the electric energy output by the photovoltaic module, and then the energy storage management component temporarily stores or releases the electric energy. The released electric energy is processed in two ways. One way is connected to the grid after the DC-AC conversion is realized through the power inverter component, and the other way is connected to the grid after the DC-AC-DC conversion is realized through the power inverter component to output constant voltage DC to power the local equipment load.

[0030] The photovoltaic input unit includes multiple power input components and a pre-sorting component connected to the power input components. The power input components are connected to the photovoltaic components accordingly. The power input components are used to receive the direct current output by the photovoltaic components. The pre-sorting components are connected to the energy storage management components. The pre-sorting components are used to control and monitor the power output of the photovoltaic components and send the direct current received by the power input components to the energy storage management module.

[0031] The power inverter assembly includes a power inverter circuit and a constant voltage rectifier circuit connected to the power inverter circuit, wherein the power inverter circuit includes a transformer T1 and transistors VT1 and VT2.

[0032] The base of transistor VT1 is connected to the cathode of diode D1, the collector of transistor VT1 is connected to the main winding of transformer T1, the emitter of transistor VT1 is connected to the emitter of transistor VT2, the anode of diode D2, the anode of diode D1, the resistor R2 and the fuse F, and the collector of transistor VT2 is connected to the main winding of transformer T1;

[0033] The resistor R2 is connected to the resistor R1 and connected to the cathode of the diode D1 and the cathode of the diode D2. The resistor R1 is connected to the potentiometer VR1 and connected to the main winding of the transformer T1. The potentiometer VR1 and the fuse F are both connected to the energy storage management component.

[0034] The secondary winding of transformer T1 is connected in parallel with capacitor Co.

[0035] This circuit is a self-excited push-pull DC to AC circuit, which converts the DC power released by the energy storage management module into AC power. The diodes D1 and D2 in the circuit play a reverse withstand voltage clamping protection role.

[0036] The constant voltage rectifier circuit includes a transformer T2 and a rectifier bridge BG connected to the secondary winding of the transformer T2, wherein:

[0037] The primary winding of transformer T2 is connected to the secondary winding of transformer T1;

[0038] One end of the rectifier bridge BG is connected to the resistor R5 and the capacitor C1, and the other end of the rectifier bridge BG is connected to the positive electrode of the voltage-stabilizing diode VD and the capacitor C2 and the other end of the capacitor C1;

[0039] The resistor R5 is connected to the cathode of the voltage stabilizing diode VD and is also connected to the other end of the capacitor C2.

[0040] This circuit converts AC into pulsating DC through the rectifier bridge BG, and smoothes and filters it through capacitors C1 and C2, and then the voltage regulator diode VD realizes the output of constant voltage DC.

[0041] The electric energy output unit includes a first output component, a second output component and a grid-connected component. The electric energy inverter circuit is connected to the first output component, the first output component is connected to the grid-connected component, and the constant voltage rectifier circuit is connected to the second output component. The electric energy released by the energy storage management module is divided into two paths. One path is converted into alternating current through the electric energy inverter circuit, and then boosted by the first output component and connected to the power grid by the grid-connected component. The other path is converted into alternating current through the electric energy inverter circuit, and then generated into constant voltage direct current through the constant voltage rectifier circuit, and output through the second output component for use by local load equipment.

[0042] The first output component is provided with an inverter and a smart meter connected to the inverter. The alternating current generated by the electric energy inverter circuit is boosted by the inverter and then connected to the power grid through the grid-connected component. The smart meter feeds back the detected grid access point data to the inverter, and the inverter dynamically adjusts the inverter output power. When the power in the grid is sufficient, the inverter stops boosting and no longer transmits power to the grid through the grid-connected component, thereby avoiding the degradation of power quality caused by excessive power in the grid.

[0043] A photovoltaic control module that outputs constant-voltage direct current in this embodiment, when in use, the front-end arrangement component controls the power output of the photovoltaic component through the power input component, and the energy storage management component temporarily stores or releases the power. The released power is processed in two ways, one of which is converted from DC to AC through the power inverter component and then incorporated into the power grid, and the other is converted from DC to AC to DC through the power inverter component and then outputs constant-voltage direct current to power the local device load.

[0044] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A photovoltaic control module for outputting constant voltage direct current, characterized in that: It includes a photovoltaic input unit, an electric energy conversion unit and an electric energy output unit, wherein the electric energy conversion unit includes an energy storage management component and an electric energy inverter component, the photovoltaic input unit is connected to the energy storage management component, the energy storage management component is connected to the electric energy inverter component, and the electric energy inverter component is connected to the electric energy output unit; The electric energy output by the photovoltaic component is transmitted to the electric energy conversion unit through the photovoltaic input unit, the energy storage management component temporarily stores the input electric energy, and after the direct current input by the photovoltaic component is converted by the electric energy inverter component, constant voltage direct current is output through the electric energy output unit.

2. The photovoltaic control module for outputting constant voltage direct current according to claim 1, characterized in that: The photovoltaic input unit includes multiple power input components and a pre-processing component connected to the power input component. The power input component is connected to the photovoltaic component accordingly. The power input component is used to receive the direct current output by the photovoltaic component. The pre-processing component is connected to the energy storage management component.

3. The photovoltaic control module for outputting constant voltage direct current according to claim 1, characterized in that: The power inverter assembly includes a power inverter circuit and a constant voltage rectifier circuit connected to the power inverter circuit, wherein the power inverter circuit includes a transformer T1 and transistors VT1 and VT2. The base of the transistor VT1 is connected to the cathode of the diode D1, the collector of the transistor VT1 is connected to the main winding of the transformer T1, the emitter of the transistor VT1 is connected to the emitter of the transistor VT2, the anode of the diode D2, the anode of the diode D1, the resistor R2 and the fuse F, and the collector of the transistor VT2 is connected to the main winding of the transformer T1; The resistor R2 is connected to the resistor R1 and connected to the cathode of the diode D1 and the cathode of the diode D2. The resistor R1 is connected to the potentiometer VR1 and connected to the main winding of the transformer T1. The potentiometer VR1 and the fuse F are both connected to the energy storage management component. The secondary winding of the transformer T1 is connected in parallel with a capacitor Co.

4. The photovoltaic control module for outputting constant voltage direct current according to claim 3, characterized in that: The constant voltage rectifier circuit includes a transformer T2 and a rectifier bridge BG connected to the secondary winding of the transformer T2, wherein: The primary winding of the transformer T2 is connected to the secondary winding of the transformer T1; One end of the rectifier bridge BG is connected to the resistor R5 and the capacitor C1, and the other end of the rectifier bridge BG is connected to the positive electrode of the voltage regulator diode VD and the capacitor C2 and the other end of the capacitor C1; The resistor R5 is connected to the cathode of the voltage stabilizing diode VD and is also connected to the other end of the capacitor C2.

5. The photovoltaic control module for outputting constant voltage direct current according to claim 4, characterized in that: The electric energy output unit includes a first output component, a second output component and a grid-connected component. The electric energy inverter circuit is connected to the first output component, the first output component is connected to the grid-connected component, and the constant voltage rectifier circuit is connected to the second output component.

6. The photovoltaic control module for outputting constant voltage direct current according to claim 5, characterized in that: The first output component is provided with an inverter and a smart electric meter connected to the inverter.

Images