Photovoltaic direct-current input case and multi-power-section photovoltaic inverter

Abstract

The utility model relates to a photovoltaic direct current input case and a multi-power-segment photovoltaic inverter. The multi-power-segment photovoltaic inverter comprises an inversion side case and one or more photovoltaic direct current input cases. The photovoltaic direct-current input case comprises a case body, a photovoltaic direct-current circuit arranged in the case body, a PV input interface arranged on the surface of the case body and a direct-current output interface arranged on the surface of the case body. The PV input interface receives PV input and transmits the PV input to the photovoltaic direct-current circuit, and the direct-current output interface is in butt joint with the photovoltaic direct-current circuit and the inverter circuit, so that circuit expansion, including power expansion and interface expansion, of the inverter side case is achieved, the capacity expansion problem of the photovoltaic inverter is effectively solved, and the application flexibility of the photovoltaic inverter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic inverters, and in particular to a photovoltaic DC input chassis and a multi-power range photovoltaic inverter. Background Art

[0002] Photovoltaic inverter is a device that converts direct current (DC) from solar panels (photovoltaic panels) into alternating current (AC). DC is difficult to use in practical applications, while AC is widely used in life and industry. Therefore, photovoltaic inverter is a very important component in solar power generation system.

[0003] In solar power generation systems, photovoltaic inverters exist as independent devices, usually in combination with solar panels, energy storage batteries, etc. At the same time, in actual use, since solar panels and energy storage batteries are easy to adjust and expand, photovoltaic inverters often face the problem of capacity expansion. When dealing with the problem of capacity expansion, traditional photovoltaic inverters need to dismantle the original inverter and replace it with a more powerful inverter. The overall workload is large and causes waste of the original inverter. Moreover, when facing complex scenarios, due to the different photovoltaic power in each region, there are mainly two traditional solutions. First, different inverters are used in different locations, but this results in a large number of equipment types and difficult use and maintenance; second, a unified configuration of high-power inverters, but this results in the inverter power in some locations not being fully used, the power margin is large, and the equipment capacity is wasted.

[0004] It can be seen that traditional photovoltaic inverters still have the above defects. Utility Model Content

[0005] In order to solve the defects that still exist in traditional photovoltaic inverters, the embodiments of the present utility model provide a photovoltaic DC input chassis and a multi-power range photovoltaic inverter.

[0006] At least one embodiment of the present disclosure provides a photovoltaic DC input chassis, comprising:

[0007] Chassis body;

[0008] A photovoltaic DC circuit disposed in the chassis;

[0009] A PV input interface provided on the surface of the chassis body, for receiving PV input;

[0010] The DC output interface arranged on the surface of the chassis body is used to connect to the inverter circuit of the inverter side chassis.

[0011] The above-mentioned photovoltaic DC input chassis includes a chassis body, a photovoltaic DC circuit arranged in the chassis body, a PV input interface arranged on the surface of the chassis body, and a DC output interface arranged on the surface of the chassis body. The PV input interface receives the PV input and transmits it to the photovoltaic DC circuit, and the DC output interface connects the photovoltaic DC circuit and the inverter circuit to realize the circuit expansion of the inverter side chassis, including power expansion and interface expansion, effectively coping with the expansion problem of the photovoltaic inverter and improving the application flexibility of the photovoltaic inverter.

[0012] As one of the optional embodiments, the photovoltaic DC circuit includes:

[0013] A DC switch, the input end of which is used to connect to the PV input interface;

[0014] A DC EMI filter unit, the input end of which is connected to the output end of the DC switch;

[0015] A DC lightning protection unit connected to the output end of the DC switch;

[0016] The MPPT circuit has an input end connected to the output end of the DC EMI filter unit, and an output end used to connect to the DC output interface.

[0017] As one of the optional embodiments, it also includes:

[0018] The first connecting mechanism is used to fix the chassis body on the inverter-side chassis.

[0019] As one of the optional embodiments, the first connecting mechanism and the DC output interface are arranged on the same side of the chassis body.

[0020] At least one embodiment of the present disclosure provides a multi-power range photovoltaic inverter, including an inverter side chassis and one or more photovoltaic DC input chassis as described in any of the above embodiments.

[0021] The above-mentioned multi-power-band photovoltaic inverter includes an inverter side chassis and one or more photovoltaic DC input chassis. The photovoltaic DC input chassis includes a chassis body, a photovoltaic DC circuit arranged in the chassis body, a PV input interface arranged on the surface of the chassis body, and a DC output interface arranged on the surface of the chassis body. The PV input interface receives the PV input and transmits it to the photovoltaic DC circuit, and the DC output interface connects the photovoltaic DC circuit and the inverter circuit to realize the circuit expansion of the inverter side chassis, including power expansion and interface expansion, which effectively copes with the capacity expansion problem of the photovoltaic inverter and improves the application flexibility of the photovoltaic inverter.

[0022] As one of the optional embodiments, an inverter circuit is provided in the inverter side chassis;

[0023] Wherein, the input end of the inverter circuit is connected to the DC output interface of the photovoltaic DC input chassis, and the output end of the inverter circuit is used to output AC power.

[0024] As one of the optional embodiments, the inverter circuit includes:

[0025] A DC bus, the input end of which is used as the input end of the inverter circuit;

[0026] A DCAC unit, the input end of which is connected to the output end of the DC bus;

[0027] an AC filter unit, the input end of which is connected to the output end of the DCAC unit;

[0028] an AC relay unit, the input end of which is connected to the output end of the AC filter unit;

[0029] An AC EMI filter unit, whose input end is connected to the output end of the AC relay unit, and whose output end is used as the output end of the inverter circuit;

[0030] The AC lightning protection unit is connected to the output end of the AC EMI filter unit.

[0031] As one of the optional embodiments, it also includes:

[0032] The second connecting mechanism disposed on the surface of the inverter side chassis is used to cooperate with the first connecting mechanism to fix the photovoltaic DC input chassis on the inverter side chassis.

[0033] As one of the optional embodiments, the first connection mechanism of the photovoltaic DC input chassis and the DC output interface are arranged on the first surface of the chassis body, and the output end of the inverter circuit and the second connection mechanism are arranged on the second surface of the inverter side chassis;

[0034] Wherein, the first surface and the second surface are butt joint surfaces.

[0035] As one of the optional embodiments, the inverter side chassis is provided with a plurality of second connection mechanisms, and each of the second connection mechanisms is used to fix the photovoltaic DC input chassis in a one-to-one correspondence. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the overall structure of a multi-power-range photovoltaic inverter according to a disclosed embodiment;

[0037] Figure 2 It is the schematic diagram of photovoltaic DC circuit;

[0038] Figure 3 It is a schematic diagram of the overall power flow;

[0039] Figure 4 is the schematic diagram of the inverter circuit;

[0040] Figure numerals: inverter side chassis 100, inverter side chassis cover 101, photovoltaic DC input chassis 102, DC switch 103, fastening screws 104, PV input interface 105, inverter side radiator 106, AC output box 107, photovoltaic DC input chassis radiator 108, AC output cable 109, communication interface 110. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0042] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of some known functions and known components.

[0044] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a multi-power-range photovoltaic inverter according to a disclosed embodiment. Figure 1 As shown, a multi-power range photovoltaic inverter of a disclosed embodiment includes:

[0045] Inverter side chassis;

[0046] Photovoltaic DC input cabinet 102.

[0047] like Figure 1As shown, the inverter side chassis includes an inverter side chassis body 100, an inverter side chassis cover 101, an inverter side radiator 106, an AC output box 107, etc., forming a complete box structure. An inverter circuit is arranged in the box structure to realize the inverter function of the photovoltaic inverter. The inverter side radiator provides heat dissipation for the heat generated by the inverter circuit, and the AC output box is used to accommodate the interface terminals and corresponding cables at the output end of the inverter circuit.

[0048] The inverter circuit has a fixed power and plays the main inverter function. The photovoltaic DC circuit of the photovoltaic DC input chassis is used to expand the power and interface.

[0049] like Figure 1 As shown, the multi-power range photovoltaic inverter includes one or more photovoltaic DC input boxes 102. One or more photovoltaic DC input boxes 102 are installed according to the power range and the number of interfaces actually required.

[0050] As one of the embodiments, Figure 1 As shown, the photovoltaic DC input chassis includes:

[0051] Chassis body;

[0052] A photovoltaic DC circuit disposed in the chassis;

[0053] A PV input interface 105 provided on the surface of the chassis body, for receiving PV input;

[0054] A DC output interface (DC+ / DC-) arranged on the surface of the chassis body is used to connect to the inverter circuit of the inverter side chassis.

[0055] like Figure 1 As shown, the chassis body is used to provide accommodation space and protection for the photovoltaic DC circuit, and is externally configured with a PV input interface 105 and a DC output interface (DC+ / DC-) to form an independent external structure product.

[0056] As one of the optional embodiments, Figure 2 is a schematic diagram of a photovoltaic DC circuit, such as Figure 2 As shown, the photovoltaic DC circuit is placed in the photovoltaic DC input box, including:

[0057] A DC switch 200, the input end of which is used to connect to the PV input interface;

[0058] A DC EMI filter unit 201, whose input end is connected to the output end of the DC switch;

[0059] A DC lightning protection unit 202, connected to the output end of the DC switch;

[0060] The MPPT circuit 203 has an input end connected to the output end of the DC EMI filter unit, and an output end used to connect to the DC output interface.

[0061] like Figure 2 As shown, the DC switch connects each PV input interface (PV1+ / PV1-, PV2+ / PV2-…PVY+ / PVY-). That is, one photovoltaic DC input chassis can provide Y groups of PV input interfaces, and the DC switch is used to control the external connection of each group of PV input interfaces, that is, to connect to the DC EMI filter unit and the DC lightning protection unit.

[0062] The DC EMI filter unit filters the PV input and outputs it to the MPPT (Maximum Power Tracking) circuit. The MPPT circuit provides power output based on the PV input through the DC output interface (DC1+ and DC1-).

[0063] Based on this, the photovoltaic DC input chassis provides front-stage power processing and provides power expansion for the subsequent inverter side chassis. Figure 3 is a schematic diagram of the overall power flow, as shown in Figure 3 As shown, after the inverter side chassis is connected to multiple photovoltaic DC input chassis, the multi-path power flow direction is determined according to the number of photovoltaic DC input chassis to perform power expansion.

[0064] As one of the optional embodiments, the photovoltaic DC input chassis further includes:

[0065] The first connecting mechanism is used to fix the chassis body on the inverter-side chassis.

[0066] The first connection mechanism includes a detachable structure such as a plug-in structure, an adhesive structure, a snap-on structure, or an assembly structure based on screws or buckles. Figure 1 As shown, the first connection mechanism fastens the screws 104, and the fastening screws fix the chassis body to the inverter side chassis.

[0067] As one of the optional embodiments, the inverter side chassis includes a second connecting mechanism arranged on the surface of the inverter side chassis, which is used to cooperate with the first connecting mechanism to fix the photovoltaic DC input chassis on the inverter side chassis.

[0068] The second connection mechanism includes a detachable structure that can cooperate with the first connection mechanism, such as a plug-in structure, an adhesive structure, a snap-on structure, or an assembly structure based on screws or buckles. Preferably, the second connection mechanism is a fastening screw hole.

[0069] As one of the embodiments, the inverter side chassis is provided with a plurality of second connection mechanisms, and each of the second connection mechanisms is used to fix the photovoltaic DC input chassis in a one-to-one correspondence.

[0070] like Figure 1 As shown, through multiple second connection mechanisms, one inverter side chassis can mount multiple photovoltaic DC input chassis, achieving physical connection and electrical connection at the same time. At the same time, each interface on the photovoltaic DC input chassis is also set opposite to the interface of the inverter side chassis (DC output interface, communication interface) for easy docking.

[0071] As one of the embodiments, Figure 1 As shown, the first connection mechanism of the photovoltaic DC input chassis and the DC output interface are arranged on the first surface of the chassis body, and the output end of the inverter circuit and the second connection mechanism are arranged on the second surface of the inverter side chassis;

[0072] Wherein, the first surface and the second surface are butt joint surfaces.

[0073] Based on this, it is convenient to organize the photovoltaic DC input boxes and the connection cables of the photovoltaic DC input boxes.

[0074] As a preferred implementation method, Figure 1 As shown, the switch button 103 of the DC switch of the photovoltaic DC circuit is uniformly set on one side of the photovoltaic DC input chassis. When multiple photovoltaic DC input chassis are mounted, on one side (such as Figure 1 The front side shown in the figure can be easily operated.

[0075] As an optional embodiment, Figure 1 As shown, the photovoltaic DC input chassis 102 further includes a chassis radiator 108 disposed on one side of the chassis body. The chassis radiator 108 is used to dissipate heat for the photovoltaic DC input chassis 102 .

[0076] As one of the embodiments, an inverter circuit is provided in the inverter side chassis;

[0077] Wherein, the input end of the inverter circuit is connected to the DC output interface of the photovoltaic DC input chassis, and the output end of the inverter circuit is used to output AC power.

[0078] like Figure 1 As shown, the AC power outputted from the output end of the inverter circuit is outputted to the outside through the AC output cable 109 .

[0079] As one example, Figure 4 is the inverter circuit diagram, such as Figure 4 As shown, the inverter circuit includes:

[0080] A DC bus 300, the input end of which is used as the input end of the inverter circuit;

[0081] A DCAC unit 301, the input end of which is connected to the output end of the DC bus;

[0082] An AC filter unit 302, the input end of which is connected to the output end of the DCAC unit;

[0083] The AC relay unit 303, the input end of which is connected to the output end of the AC filter unit;

[0084] An AC EMI filter unit 304, whose input end is connected to the output end of the AC relay unit, and whose output end is used as the output end of the inverter circuit;

[0085] The AC lightning protection unit 305 is connected to the output end of the AC EMI filter unit.

[0086] The DC bus is connected to each DC output interface (DC1+ / DC1-, DC2+ / DC2-…DCX+ / DCX-). According to the processing of the DCAC unit, AC filter unit and AC relay unit, the corresponding AC power (L1 / L2 / L3 / N) is output to the power grid, energy storage system or corresponding load.

[0087] The multi-power-band photovoltaic inverter of the disclosed embodiment includes an inverter-side chassis and one or more photovoltaic DC input chassis. The photovoltaic DC input chassis includes a chassis body, a photovoltaic DC circuit disposed in the chassis body, a PV input interface disposed on the surface of the chassis body, and a DC output interface disposed on the surface of the chassis body. The PV input interface receives PV input and transmits it to the photovoltaic DC circuit, and the DC output interface connects the photovoltaic DC circuit and the inverter circuit to realize circuit expansion of the inverter-side chassis, including power expansion and interface expansion, effectively coping with the capacity expansion problem of the photovoltaic inverter and improving the application flexibility of the photovoltaic inverter.

[0088] There are a few points to note about this disclosure:

[0089] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0090] (2) For the sake of clarity, the thickness and size of layers or structures are exaggerated in the drawings used to describe the embodiments of the present invention. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be intermediate elements.

[0091] (3) In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be subject to the protection scope of the claims.

[0092] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A photovoltaic DC input chassis, characterized in that: include: Chassis body; A photovoltaic DC circuit disposed in the chassis; A PV input interface provided on the surface of the chassis body, for receiving PV input; The DC output interface arranged on the surface of the chassis body is used to connect to the inverter circuit of the inverter side chassis.

2. The photovoltaic DC input chassis according to claim 1, characterized in that: The photovoltaic DC circuit comprises: A DC switch, the input end of which is used to connect to the PV input interface; A DC EMI filter unit, the input end of which is connected to the output end of the DC switch; A DC lightning protection unit connected to the output end of the DC switch; The MPPT circuit has an input end connected to the output end of the DC EMI filter unit, and an output end used to connect to the DC output interface.

3. The photovoltaic DC input chassis according to claim 1, characterized in that: Also includes: The first connecting mechanism is used to fix the chassis body on the inverter-side chassis.

4. The photovoltaic DC input chassis according to claim 3, characterized in that: The first connecting mechanism and the DC output interface are arranged on the same side of the chassis body.

5. A multi-power range photovoltaic inverter, characterized in that: It comprises an inverter side chassis and one or more photovoltaic DC input chassis as described in any one of claims 1 to 4.

6. The multi-power range photovoltaic inverter according to claim 5, characterized in that: An inverter circuit is arranged in the inverter side chassis; Wherein, the input end of the inverter circuit is connected to the DC output interface of the photovoltaic DC input chassis, and the output end of the inverter circuit is used to output AC power.

7. The multi-power-range photovoltaic inverter according to claim 6, characterized in that: The inverter circuit comprises: A DC bus, the input end of which is used as the input end of the inverter circuit; A DCAC unit, the input end of which is connected to the output end of the DC bus; an AC filter unit, the input end of which is connected to the output end of the DCAC unit; an AC relay unit, the input end of which is connected to the output end of the AC filter unit; An AC EMI filter unit, whose input end is connected to the output end of the AC relay unit, and whose output end is used as the output end of the inverter circuit; The AC lightning protection unit is connected to the output end of the AC EMI filter unit.

8. The multi-power-range photovoltaic inverter according to claim 5, characterized in that: Also includes: The second connecting mechanism disposed on the surface of the inverter side chassis is used to cooperate with the first connecting mechanism to fix the photovoltaic DC input chassis on the inverter side chassis.

9. The multi-power range photovoltaic inverter according to claim 8, characterized in that: The first connection mechanism of the photovoltaic DC input chassis and the DC output interface are arranged on the first surface of the chassis body, and the output end of the inverter circuit and the second connection mechanism are arranged on the second surface of the inverter side chassis; Wherein, the first surface and the second surface are butt joint surfaces.

10. The multi-power range photovoltaic inverter according to claim 9, characterized in that: The inverter side chassis is provided with a plurality of second connection mechanisms, and each of the second connection mechanisms is used to fix the photovoltaic DC input chassis in a one-to-one correspondence.

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