CN213717915U

CN213717915U - Solar grid-connected inverter

Info

Publication number: CN213717915U
Application number: CN202021529551.4U
Authority: CN
Inventors: 李枝玖; 王艳; 孙枫
Original assignee: Baoding Sanggu Electric Technology Co Ltd
Current assignee: Baoding Sanggu Electric Technology Co Ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-07-16
Anticipated expiration: 2030-07-29

Abstract

The utility model discloses a solar grid-connected inverter, which comprises an inversion unit component, a sensor component, a power unit component, a control unit component, a filter unit component, a transformer component, a direct current input port component and an alternating current output port component; the inversion unit component is connected with the sensor component and the control unit component; the sensor component is connected with the inversion unit component, the filter unit component and the alternating current output port component; the power unit component is connected with the control unit component and the inversion unit component; the control unit assembly is connected with the power unit assembly and the direct current input port assembly; the filter unit component is connected with the inversion unit component and the transformer component; the transformer assembly is connected with the sensor assembly and the alternating current output port assembly; the utility model relates to a simply, equipment is small, can reduce actual loss electric energy by a wide margin.

Description

Solar grid-connected inverter

Technical Field

The utility model relates to a solar energy power generation field especially relates to a solar grid-connected inverter.

Background

Inverters, also known as power regulators and power regulators, are an essential part of photovoltaic systems. The photovoltaic inverter mainly has the function of converting direct current generated by the solar panel into alternating current used by household appliances, and all electricity generated by the solar panel can be output externally only through the processing of the inverter.

Through a full-bridge circuit, an SPWM processor is generally adopted to obtain sinusoidal alternating current matched with the frequency, the rated voltage and the like of an illumination load through modulation, filtering, boosting and the like, and the sinusoidal alternating current is used by a system end user. With the inverter, the direct-current storage battery can be used for providing alternating current for the electric appliance.

The solar alternating current power generation system consists of a solar panel, a charge controller, an inverter and a storage battery; the solar dc power generation system does not include inversion. The process of converting ac energy into dc energy is called rectification, the circuit performing the function of rectification is called a rectifier circuit, and the device performing the rectification process is called a rectifier device or rectifier. Correspondingly, the process of converting direct current electric energy into alternating current electric energy is called inversion, a circuit completing the inversion function is called an inverter circuit, and a device realizing the inversion process is called an inverter device or an inverter.

The core of the inverter is an inverter switch circuit, which is simply referred to as an inverter circuit. The circuit completes the inversion function through the on and off of the power electronic switch. The switching of power electronic switching devices requires certain driving pulses, which may be adjusted by varying a voltage signal. The circuitry that generates and conditions the pulses is commonly referred to as control circuitry or control loop. The basic structure of the inverter device includes a protection circuit, an output circuit, an input circuit, an output circuit, and the like, in addition to the inverter circuit and the control circuit.

Traditional inverter circuits such as resistors and capacitors are all fixed and uncontrollable, are inflexible to adjust, consume large energy, and are difficult to meet practical requirements.

Disclosure of Invention

The utility model aims at providing a solar energy inverter that is incorporated into power networks to solve at least one problem that above-mentioned prior art exists, make electronic load equipment controllable, and reduce actual loss electric energy.

In order to achieve the above object, the utility model provides a following scheme: the utility model discloses a solar grid-connected inverter, include: the device comprises an inversion unit component, a sensor component, a power unit component, a control unit component, a filter unit component, a transformer component, a direct current input port component and an alternating current output port component;

the inversion unit component is connected with the sensor component and the control unit component;

the sensor component is connected with the inversion unit component, the filter unit component and the alternating current output port component;

the power unit component is connected with the control unit component and the inversion unit component;

the control unit assembly is connected with the power unit assembly and the direct current input port assembly;

the filter unit component is connected with the inversion unit component and the transformer component;

the transformer assembly is connected with the sensor assembly and the alternating current output port assembly.

Preferably, the inversion unit component comprises an IGBT group, a first inversion filter capacitor, a second inversion filter capacitor and a direct current voltage stabilizing capacitor;

the IGBT group is connected with the first inversion filter capacitor, the first inversion filter capacitor is connected with the direct current voltage stabilizing capacitor, the direct current voltage stabilizing capacitor is connected with the second inversion filter capacitor, the second inversion filter capacitor is connected with the IGBT group, and the IGBT group is connected with the direct current input port;

preferably, the sensor assembly comprises a current sensor element, a voltage sensor element and an intelligent three-phase electric parameter meter;

the current sensor element is connected with the inversion unit component, and the current sensor is also connected with the intelligent three-phase electric parameter meter;

the voltage sensor is connected with the filter unit component and is also connected with the intelligent three-phase electric parameter meter;

the intelligent three-phase electric parameter meter is connected with the current sensor element and the alternating current output port assembly;

preferably, the control unit assembly comprises a switch unit, an RLC load unit and a current transformer unit, and is used for signal output and control of the circuit operation condition;

the current transformer unit is connected with the alternating current output port;

preferably, the filter unit component comprises a filter capacitor and a reactor;

preferably, the filter capacitance comprises: a first filter capacitor, a second filter capacitor, a third filter capacitor;

preferably, the reactor includes: a first reactor, a second reactor and a third reactor;

preferably, the transformer assembly is a power frequency transformer;

preferably, the solar grid-connected inverter further comprises a pre-charging module, and the pre-charging module is used for preventing the surge current from damaging the devices of the solar grid-connected inverter.

The utility model discloses a following technological effect:

1. the fully-controlled IGBT power module is adopted, the switching frequency is 10kHz, the size of the filter reactor can be reduced by 50%, the loss is reduced by 10%, the response speed is improved to within 1ms, the output precision reaches 0.5%, and the volt-ampere characteristic and the 24-hour operation curve of the load can be set at will;

2. the circuit structure is simple, the cost is low, the box body is small in size, the carrying and the installation are convenient, the whole circuit system is stable, the circuit energy consumption is reduced by more than 90%, and the popularization and the application are convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a solar grid-connected inverter configuration diagram;

FIG. 2 is a front view of the internal structure of the cabinet body of the electric cabinet;

FIG. 3 is a back view of the internal structure of the cabinet body of the electric cabinet;

FIG. 4 is a circuit diagram of the internal circuit structure of the electric cabinet;

wherein, 1 is the contravariant unit subassembly, 2 is the power unit subassembly, 3 is the control unit subassembly, 4 is the sensor subassembly, 5 is the filter unit subassembly, 6 is the transformer subassembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

The utility model provides a solar grid-connected inverter,

as shown in fig. 1-4, to achieve the above object, the present invention provides the following solutions: the utility model provides a solar grid-connected inverter, as shown in FIG. 1, its characteristic includes: the system comprises an inversion unit component 1, a sensor component 4, a power unit component 2, a control unit component 3, a filter unit component 5 and a transformer component 6;

as shown in fig. 4, the inverter unit assembly 1 includes an IGBT group, a first inverter filter capacitor, a second inverter filter capacitor, and a dc voltage stabilizing capacitor;

the capacitor in the inversion unit component 1 is selected from Japanese Hitachi original large-capacity electrolytic capacitors, 2 strings and 4 parallel capacitors are adopted, and the capacitor model is as follows: HCGFA-4700MFD-450VDC, the power device adopts German Yingfei IGBT, IGBT + IGBT drive model respectively: FF450R12ME4+2SP0115T2A 0-12;

as shown in fig. 4, an IGBT group in the inverter unit assembly 1 is formed by connecting 6 IGBTs in parallel with a compensation capacitor, the IGBT group is connected to the first inverter filter capacitor, the first inverter filter capacitor is connected to the dc voltage stabilizing capacitor, the dc voltage stabilizing capacitor is connected to the second inverter filter capacitor, the second inverter filter capacitor is connected to the IGBT group, and the IGBT group is connected to a dc power output port;

as shown in fig. 4, the sensor assembly 4 includes a current sensor element, a voltage sensor element, and an intelligent three-phase electrical parameter table; the current sensor is connected with the inversion unit component 1 and the digital display ammeter, and the voltage sensor is connected with the filter component 5 and the digital display ammeter;

the sensor component 4 is a lyme sensor, and the model LT108-S of the current, direct voltage and current lyme sensor;

as shown in fig. 1, the power unit assembly 2 is connected with the control unit assembly 3 and the inverter unit assembly 1;

as shown in fig. 3, the control unit assembly 3 includes a switch unit, an RLC load unit, and a current transformer unit, for signal output and control of the circuit operation condition; the PLC load unit is Siemens 200 series PLC, model: 6ES 7214-2 AD23-0XB8,

as shown in fig. 1, the filter assembly 5 includes a filter capacitor and a reactor;

as shown in fig. 4, the filter capacitors of the filter are composed of a first filter capacitor, a second filter capacitor and a third filter capacitor;

as shown in fig. 2, the reactor 1 is composed of a first reactor, a second reactor, and a third reactor;

as shown in fig. 4, the filter unit assembly 5 is connected to the inverter unit assembly 1 and the transformer 6;

the working mode of the utility model is as shown in figure 4:

the direct current voltage range is 200V-600V, solar direct current is electrically connected to the input end of a direct current power supply, three-phase electricity is formed after inversion operation is carried out on an inversion unit component 1, enters a filter unit component 5, enters a power frequency transformer 6 after passing through the filter unit component 5, and finally alternating current is output after voltage stabilization is carried out on the alternating current by the transformer;

wherein the model of the main loop direct current breaker is CM 1-160C/3300-160A;

the model of the main loop AC circuit breaker is CM 1-100C/3300-100A;

the AC contactor is _ LC1-D95M7C _95A-220V-50/60Hz _ Schneider;

the pre-charging function is designed according to the characteristics of the solar grid-connected inverter, the pre-charging module pre-charges the direct-current voltage-stabilizing capacitor C, the main contactor is in an off state, 3 seconds are delayed after the main loop is closed, and then the main contactor is closed to bypass the pre-charging resistor, so that the device of the solar grid-connected inverter can be prevented from being damaged by impact current.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. A solar grid-connected inverter, comprising: the device comprises an inversion unit component (1), a sensor component (4), a power unit component (2), a control unit component (3), a filter unit component (5), a transformer component (6), a direct current input port component and an alternating current output port component;

the inversion unit component (1) is connected with the sensor component (4) and the control unit component (3);

the sensor assembly (4) is connected with the inversion unit assembly (1), the filter unit assembly (5) and the alternating current output port assembly;

the power unit component (2) is connected with the control unit component (3) and the inversion unit component (1);

the control unit assembly (3) is connected with the power unit assembly (2) and the direct current input port assembly;

the filter unit component (5) is connected with the inversion unit component (1) and the transformer component (6);

the transformer assembly (6) is connected with the sensor assembly (4) and the alternating current output port assembly.

2. The solar grid-connected inverter according to claim 1, wherein:

the inversion unit component (1) comprises an IGBT group, a first inversion filter capacitor, a second inversion filter capacitor and a direct-current voltage-stabilizing capacitor;

the IGBT group is connected with the first inversion filter capacitor, the first inversion filter capacitor is connected with the direct current voltage stabilizing capacitor, the direct current voltage stabilizing capacitor is connected with the second inversion filter capacitor, the second inversion filter capacitor is connected with the IGBT group, and the IGBT group is connected with the direct current input port.

3. The solar grid-connected inverter according to claim 1, wherein:

the sensor assembly (4) comprises a current sensor element, a voltage sensor element and an intelligent three-phase electric parameter meter;

the current sensor element is connected with the inversion unit component (1), and the current sensor is also connected with the intelligent three-phase electric parameter meter;

the voltage sensor is connected with the filter unit component (5), and the voltage sensor is also connected with an intelligent three-phase electric parameter meter;

the intelligent three-phase electric parameter meter is connected with the current sensor element and the alternating current output port assembly.

4. The solar grid-connected inverter according to claim 1, wherein:

the control unit assembly (3) comprises a switch unit, an RLC load unit and a current transformer unit, and is used for outputting and controlling signals of the circuit operation condition;

and the current transformer unit is connected with the alternating current output port.

5. The solar grid-connected inverter according to claim 1, wherein:

the filter unit component (5) comprises a filter capacitor and a reactor.

6. The solar grid-connected inverter according to claim 5, wherein:

the filter capacitor comprises: a first filter capacitor, a second filter capacitor, and a third filter capacitor.

7. The solar grid-connected inverter according to claim 5, wherein:

the reactor includes: the reactor comprises a first reactor, a second reactor and a third reactor.

8. The solar grid-connected inverter according to claim 1, wherein:

the transformer assembly (6) is a power frequency transformer.

9. The solar grid-connected inverter according to claim 1, wherein:

the solar grid-connected inverter also comprises a pre-charging module, wherein the pre-charging module is used for preventing impact current from damaging devices of the solar grid-connected inverter.