An inverter assembly and inverter system

Abstract

The utility model relates to inverter technical field relates to a kind of inverter assembly and inverter system, including multiple inverter main body, inductor group and ac distribution device;Including multiple inverters in inverter main body, the one end of inverter is connected power supply device, the other end is connected inductor, and multiple inductors are parallelly arranged on parallel operation base;AC distribution device includes the same number of inductor setting breaker, one end of breaker is connected with inductor, the other end is connected power grid, and breaker is used to control the inverter of fault inverter when any inverter fails, and the line connected with it is disconnected to carry out fault separation.The inductor and ac distribution device of the application are external to inverter main body, which is more convenient for construction and maintenance, and even if a inverter fails, the breaker can be cut off directly to realize fault separation. Compared with the method of high coupling between inverter dc and ac branch, it not only ensures the power generation, but also improves the power supply stability.

Description

Technical Field

[0001] This utility model relates to the field of inverter technology, specifically to an inverter component and an inverter system. Background Technology

[0002] In the current photovoltaic power generation field, centralized photovoltaic inverters, as the core equipment for converting direct current (DC) to alternating current (AC) and achieving grid connection, generally have a single-unit capacity design concentrated in the range of 2 to 5 megawatts (MW). While this scale helps improve power generation efficiency and reduce unit costs, it also harbors a system vulnerability that cannot be ignored. Specifically, the internal architecture of this type of inverter is a highly integrated structure, with a high degree of coupling between its DC input branch and AC output branch. That is, the DC power generated by all photovoltaic modules is collected and directly converted into AC power by the inverter and output to the grid, with no effective electrical isolation mechanism between the branches. Once this connection method encounters a fault, whether it is a sudden drop in output power on the DC side due to module aging or shading, or a protection action triggered on the AC side by grid faults or voltage fluctuations, the fault signal will quickly spread to the entire inverter system due to the close connection between the branches. This makes it impossible for the inverter to selectively disconnect the faulty branch, and it can only force the entire unit to shut down. This not only directly leads to a sharp decline in the power generation of photovoltaic power plants, but more importantly, frequent unplanned outages can disrupt the power grid's balance, reduce power supply reliability, and may even damage grid equipment due to the inrush current during inverter restarts. It is evident that the highly integrated structure within the aforementioned inverter can result in reduced power generation and low power supply stability. Utility Model Content

[0003] This invention provides an inverter assembly and an inverter system, aiming to solve the problem that the high coupling between the DC input branches and AC output branches inside the existing inverters makes it impossible to quickly cut off faults, resulting in reduced power generation and low power supply stability.

[0004] This utility model is implemented as follows: Firstly, it provides an inverter assembly, including multiple inverter bodies, an inductor group, and an AC power distribution device; wherein, The inverter body includes multiple inverters, and the inductor group includes the same number of inductors as the inverters in the inverter body. One end of the inverter is connected to the power supply device, and the other end of the inverter is connected to the inductor. The inductor group is mounted on the parallel base. The AC power distribution device includes circuit breakers arranged in the same number as the inductors. One end of the circuit breaker is connected to the inductors, and the other end of the circuit breaker is connected to the power grid. The circuit breakers in the AC power distribution device are used to control the line where the faulty inverter is located to disconnect in order to isolate the fault when any of the inverters fails.

[0005] Optionally, each inverter body includes a first inverter and a second inverter, a main power heat sink is provided between the first inverter and the second inverter, and a receiving cavity is formed between the first inverter, the second inverter and the main power heat sink, and the inductor group is inserted into the receiving cavity to connect with the inverter body.

[0006] Optionally, the inductor group on the same grid-connected base includes a first inductor and a second inductor, wherein the first inductor is connected to the first inverter and the second inductor is connected to the second inverter.

[0007] Optionally, the first inverter and the second inverter each include a main air duct fan, a cabin temperature heat exchanger, a cabin temperature heat exchanger fan, and an airflow baffle. By changing the configuration of the main air duct fan and the cabin temperature heat exchanger, different heat dissipation channels can be formed based on the main air duct fan, the cabin temperature heat exchanger, the cabin temperature heat exchanger fan, and the airflow baffle.

[0008] Optionally, the main air duct fan is externally installed at the air inlet of the first inverter and the second inverter, the cabin temperature heat exchanger is installed inside the air inlet of the first inverter and the second inverter, and the first end of the cabin temperature heat exchanger extends into the main air duct, the second end extends into the first inverter or the second inverter, and the cabin temperature heat exchanger fan is installed at the second end of the cabin temperature heat exchanger. External airflow enters the main air duct from the main air duct fan of the first inverter and the second inverter, and then flows through the main power heat sink and the inductor group to form the main heat dissipation air duct; The cavities of the first inverter and the second inverter are isolated by the airflow baffles to form their respective cavity heat dissipation channels. External airflow enters their respective cavity heat dissipation channels through the cabin temperature heat exchanger and the cabin temperature heat exchanger fan for cavity heat dissipation.

[0009] Optionally, the main air duct fan is respectively installed on the top of the main power heat sink between the first inverter and the second inverter. The main air duct fan draws air inward, and the external airflow is drawn into the main air duct fan from the main air duct between the first inverter and the second inverter, and then flows through the main power heat sink and the inductor group to form the main heat dissipation air duct.

[0010] Optionally, the cabin temperature heat exchanger is disposed on top of the main power radiator between the first inverter and the second inverter to form an airflow heat exchange channel with opposite airflow directions, and the cabin temperature heat exchanger fan is respectively disposed in the first inverter and the second inverter on the side close to the main air duct fan. Air is drawn inward by the fan of the cabin temperature heat exchanger, and the external airflow circulates and dissipates heat within the dual cavities between the cavity heat dissipation channels in the first inverter and the second inverter and the airflow heat exchange channel formed by the cabin temperature heat exchanger.

[0011] Optionally, the first inverter and the second inverter may further include a DC input copper busbar, a DC fuse, a DC disconnect switch, a bus capacitor, and an inverter module, respectively. One end of the DC input copper busbar is connected to the power supply device, the other end of the DC input copper busbar is connected to one end of the DC fuse, the other end of the DC fuse is connected to one end of the DC disconnect switch, the other end of the DC disconnect switch is connected to one end of the bus capacitor, and the other end of the bus capacitor is connected to the inverter module. The inverter module generates AC power and outputs it to the power grid.

[0012] Optionally, the first inverter and the second inverter each further include an AC filter capacitor, which is connected to the inverter module.

[0013] The present invention is implemented as follows: In a second aspect, an inverter system is provided, including a power supply device, a power grid, and an inverter assembly as described above, wherein one end of the inverter assembly is connected to the power supply device and the other end is connected to the power grid.

[0014] The beneficial effects achieved by this utility model are as follows: By placing the inductors and AC power distribution devices externally in the inverter body, it is easier to carry out and maintain each part of the equipment individually; and by placing multiple inductors on the same parallel base and multiple circuit breakers in the AC power distribution device, it is easier to manage them in a unified manner. At the same time, it makes the inverter, inductors and circuit breakers form a one-to-one connection. Even if a certain inverter fails, the circuit breaker on the line where the faulty inverter is located can be disconnected in time to directly achieve fault isolation without affecting other parallel inverters. Compared with the method of highly coupling the DC input branches and AC output branches inside the inverter, it not only ensures the power generation, but also improves the stability of the power supply. Attached Figure Description

[0015] Figure 1 A schematic diagram of an inverter assembly provided for an embodiment of this utility model; Figure 2 Another schematic diagram of an inverter assembly provided in an embodiment of this utility model; Figure 3 A schematic diagram of the inverter body provided in an embodiment of this utility model; Figure 4 A schematic diagram of heat dissipation airflow for the inverter body provided in an embodiment of this utility model; Figure 5 Another schematic diagram of heat dissipation airflow for the inverter body provided in this embodiment of the utility model; Figure 6 Another schematic diagram of heat dissipation airflow for the inverter body provided in this embodiment of the utility model; Figure 7 This is a circuit connection diagram of an inverter assembly provided in an embodiment of the present invention.

[0016] The components include: 1. Inverter main body; 2. Inductor group; 3. AC power distribution device; 4. Parallel base; 5. Containment cavity; 6. Main power heat sink; 7. Main air duct fan; 8. Cabin temperature heat exchanger; 9. Cabin temperature heat exchanger fan; 10. Airflow baffle; 11. DC fuse; 12. DC disconnect switch; and 13. Bus capacitor. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] By placing the inductors and AC power distribution equipment externally within the inverter body, it is easier to install and maintain each component separately. Furthermore, by placing multiple inductors on the same parallel base and multiple circuit breakers in the AC power distribution equipment, unified management is facilitated. This also ensures a one-to-one connection between the inverter, inductors, and circuit breakers. Even if a fault occurs in one inverter, the circuit breaker on the line containing the faulty inverter can be disconnected immediately to isolate the fault without affecting other inverters connected in parallel. Compared to the method of highly coupling the DC input branches and AC output branches within the inverter, this not only guarantees power generation but also improves power supply stability.

[0019] Example 1 Referring to Figure 1, this embodiment of the present invention provides an inverter assembly, including multiple inverter bodies 1, inductor groups 2, and AC power distribution devices 3; wherein, The inverter body 1 includes multiple inverters, and the inductor group 2 includes the same number of inductors as the inverters in the inverter body 1. One end of the inverter is connected to the power supply device, and the other end of the inverter is connected to the inductor. The inductor group 2 is mounted on the parallel base 4. The AC power distribution device 3 includes circuit breakers arranged in the same number as the inductors. One end of the circuit breaker is connected to the inductors, and the other end is connected to the power grid. The circuit breakers in the AC power distribution device 3 are used to control the disconnection of the line where the faulty inverter is located in order to isolate the fault when any inverter fails.

[0020] Multiple inverters can be integrated on one inverter body 1. In this embodiment, two inverters are integrated on one inverter body 1, such as... Figure 1 Inverters 1_1 and 1_2 are included, and more inverters can be integrated. Inverters convert the direct current (DC) input from the power supply unit into alternating current (AC) for input into the power grid, either for grid use or directly to the load. Furthermore, the inverters can track the maximum power point of the photovoltaic (PV) modules in real time via MPPT (Maximum Power Point Tracking) to adjust their operating status, ensuring the PV modules always operate near their maximum power point, thereby improving the power generation efficiency of the PV system. The power supply unit can be PV modules, wind turbine modules, etc., used to collect DC power.

[0021] The inductor group 2 may include multiple inductors, which can be mounted on a grid-connected base. In this embodiment, two inductors are mounted on one grid-connected base, corresponding to and connected to two inverters in one inverter body 1. Figure 1 Capacitors 1_1 and 1_2 are included. Multiple grid-connected bases can be arranged in parallel. Inductors are connected in the inverter's output circuit to filter out high-frequency harmonic components in the AC power, making the output AC waveform smoother and reducing interference to the power grid and other electrical equipment. Inductors can also store energy and release it when needed. Furthermore, when a short circuit or other fault occurs in the circuit, the inductor generates inductive reactance, limiting the rapid rise in current and providing protection to prevent damage to components in the circuit.

[0022] like Figures 1 to 2 As shown, the AC power distribution device 3 can be an AC power distribution cabinet. The AC power distribution device 3 may include multiple circuit breakers, the same number as the inductors. These circuit breakers can be AC ​​power distribution circuit breakers. When multiple inverters are connected one-to-one with the circuit breakers in the AC power distribution cabinet based on the inductors, unified management of all inverters can be achieved through a single AC power distribution cabinet.

[0023] In this embodiment, by sequentially connecting each inverter, inductor, and circuit breaker, multiple inverters, inductors, and circuit breakers connected in a one-to-one correspondence will form an inverter array connected to the power grid. That is, the inverter array includes n inverters, n inductors, and n circuit breakers, where n≥2. Furthermore, the one-to-one connection of each inverter, inductor, and circuit breaker will form an independent grid-connected channel, thereby providing multiple MPPT channels for power generation.

[0024] Furthermore, when the inverter in the circuit is fault-free, the circuit breaker is in the closed state. The AC power collected by the photovoltaic modules is converted into DC power by the inverter and then output to the inductor. After being filtered by the inductor, it is output to the grid. When an inverter in a certain circuit fails, the circuit breaker will be in the open state, thereby controlling the disconnection of the line containing the faulty inverter to isolate the fault, avoid damage to other components in the circuit, and at the same time, it will not affect the grid-connected power generation of other inverters connected in parallel.

[0025] In this embodiment of the utility model, by placing the inductors and AC power distribution device 3 externally on the inverter body 1, it is easier to carry out individual construction and maintenance of each part of the equipment. Moreover, by placing multiple inductors on the same parallel base 4 and multiple circuit breakers uniformly in the AC power distribution device 3, it is easier to manage them in a unified manner. This allows the inverters, inductors, and circuit breakers to form a one-to-one connection. Even if a certain inverter fails, the circuit breaker on the line where the faulty inverter is located can be disconnected in time to directly achieve fault isolation without affecting other parallel inverters. Compared with the method of highly coupling each DC input branch and AC output branch inside the inverter, it not only ensures power generation but also improves power supply stability. In addition, since multiple inverters, circuit breakers, and inductors can be combined to form an inverter array, compared with the traditional inverter having only one maximum power point tracking channel for power generation, this application can form more maximum power point tracking channels by combining multiple inverters with each circuit breaker and inductor group 2, which is more conducive to increasing power generation.

[0026] Example 2 Combination Figure 1 As shown, in some optional embodiments, based on the above embodiment one, each inverter body 1 includes a first inverter and a second inverter, a main power heat sink 6 is provided between the first inverter and the second inverter, and a receiving cavity 5 is formed between the first inverter, the second inverter and the main power heat sink 6, and an inductor group 2 is inserted into the receiving cavity 5 to connect with the inverter body 1.

[0027] Within the same inverter body 1, two inverters, namely a first inverter and a second inverter, can be installed, and the first inverter and the second inverter can be arranged symmetrically. A main power heat sink 6 is provided between the first inverter and the second inverter. The main power heat sink 6 can be a two-phase flow heat sink or a sawtooth heat sink.

[0028] In this embodiment, a cavity 5 is formed between the first inverter, the second inverter, and the main power heat sink 6. The cavity 5 is concave. When the two inductors located in the middle of the grid-connected base are connected to the inverter body 1, one end of the two inductors is inserted into the cavity 5 to achieve connection. After the inductors are inserted into the cavity 5, their tops are in contact with the bottom of the main power heat sink 6, and the two sides of the grid-connected base are in contact with the bottoms of the first inverter and the second inverter, respectively. The airflow flowing through the main power heat sink 6 will diffuse towards the inductors, thereby achieving heat dissipation for the inductors. Furthermore, by setting two inverters in one inverter body 1 to share the heat dissipation channel flowing through the main power heat sink 6, the heat dissipation efficiency is higher than that of setting more inverters in the inverter body 1. This is more conducive to ensuring the stable operation of each inverter and avoids the situation where the inverters closer to the middle have low heat dissipation efficiency, resulting in poor inverter operation stability or even damage due to high temperature, when more inverters are set in the inverter body 1.

[0029] In this embodiment, a first inverter and a second inverter are arranged in the same inverter body 1. A main power heat sink 6 is arranged between the first inverter and the second inverter, and a cavity 5 is formed to cooperate with the inductor. This ensures that the airflow flowing through the main power heat sink 6 can dissipate heat from the inductor, and the first inverter and the second inverter can share the heat dissipation channel flowing through the main power heat sink 6. This can reduce structural components and lower costs.

[0030] Example 3 Combination Figure 1 and 3 As shown, in some optional embodiments, based on the above embodiment 2, the inductor group 2 on the same grid-connected base includes a first inductor and a second inductor, the first inductor being connected to the first inverter and the second inductor being connected to the second inverter.

[0031] In this design, a first inductor and a second inductor can be arranged side-by-side on the same grid-connected base, with the first and second inductors positioned in the middle of the base. This ensures that when the inductors are connected to the inverter body 1, they fit perfectly into the receiving cavity 5, and the sides of the grid-connected base align with the bottoms of the first and second inverters, thus avoiding wasted space. After the inductors are inserted into the receiving cavity 5, the first inductor closer to the first inverter connects to the first inverter, and the second inductor closer to the second inverter connects to the second inverter. This allows each of the two inverters in one inverter body 1 to be connected to two inductors on a grid-connected base, enabling the AC power output from the two inverters in the inverter body 1 to be filtered and supplied to the grid through different inductors.

[0032] In this embodiment, a first inductor and a second inductor are installed on the same grid-connected base. This allows for compatible connection with the first inverter and the second inverter installed in the inverter body 1. This ensures that the first inverter and the second inverter share a common airflow channel through the main power radiator 6, while also achieving a secure connection with the first inductor and the second inductor. The airflow through the main power radiator 6 is used to dissipate heat from the first inductor and the second inductor, ensuring that the first inductor and the second inductor installed on each grid-connected base can operate continuously and stably.

[0033] Example 4 Combination Figure 3 As shown, in some optional embodiments, based on the above embodiment two, the first inverter and the second inverter respectively include a main air duct fan 7, a cabin temperature heat exchanger 8, a cabin temperature heat exchanger fan 9, and an airflow baffle 10. By changing the setting of the main air duct fan 7 and the cabin temperature heat exchanger 8, different heat dissipation channels are formed based on the main air duct fan 7, the cabin temperature heat exchanger 8, the cabin temperature heat exchanger fan 9, and the airflow baffle 10.

[0034] In this embodiment, the main air duct fan 7 can refer to a device installed on the main air duct for heat dissipation. The main air duct can refer to the airflow from the outside that is drawn in and flows through the heat dissipation channel of the main power radiator 6. The cabin temperature heat exchanger 8 can be a two-phase flow heat exchanger or an air heat exchanger. The cabin temperature heat exchanger fan 9 can be a vortex fan, an axial flow fan, or a mixed flow fan, etc. During operation, the equipment or components inside the first inverter and the second inverter will generate a large amount of heat. The cabin temperature heat exchanger fan 9 can generate airflow by rotating, accelerating the circulation of air inside the inverter cabin, so that heat can be transferred to the heat exchanger and other heat dissipation components more quickly, thereby improving heat dissipation efficiency. The airflow baffles 10 can be respectively installed in the cabins of the first inverter and the second inverter for spatial isolation, so as to ensure that the airflow flowing into the cabins of the first inverter and the second inverter can be more widely diffused to more equipment or components, so that more equipment or components can be dissipated.

[0035] In this embodiment, by changing the installation positions of the main air duct fan 7 and the cabin temperature heat exchanger 8, the main air duct fan 7 can draw air into the main air duct of the inverter, exchange heat through the cabin temperature heat exchanger 8, draw air into the cabin of the inverter through the cabin temperature heat exchanger fan 9, and isolate space through the airflow baffle 10. This ensures that the airflow drawn into the cabin of the inverter by the cabin temperature heat exchanger fan 9 can reach more components or equipment for heat dissipation, making it more practical.

[0036] Example 5 Combination Figure 4As shown, in some optional embodiments, based on the above embodiment four, the main air duct fan 7 is respectively externally disposed at the air inlet of the first inverter and the second inverter, the cabin temperature heat exchanger 8 is respectively disposed in the air inlet of the first inverter and the second inverter, and the first end of the cabin temperature heat exchanger 8 extends into the main air duct, the second end extends into the first inverter or the second inverter where it is located, and the cabin temperature heat exchanger fan 9 is respectively disposed at the second end of the cabin temperature heat exchanger 8; External airflow enters the main air duct from the main air duct fan 7 of the first inverter and the second inverter, and then flows through the main power heat sink 6 and the inductor group 2 to form the main heat dissipation air duct. The cavities of the first inverter and the second inverter are isolated by airflow baffles 10, forming their own cavity heat dissipation channels. External airflow enters their respective cavity heat dissipation channels through the cabin temperature heat exchanger 8 and the cabin temperature heat exchanger fan 9 for cavity heat dissipation.

[0037] In one possible implementation, the air inlet can refer to the air inlet of the main air duct. The main air duct fan 7 can be externally mounted at the air inlets of the first inverter and the second inverter, respectively, and the cabin temperature heat exchanger 8 can be mounted inside the air inlets of the first inverter and the second inverter, respectively. Simultaneously, the first end of the heat exchanger extends into the main air duct, and the second end extends into the cavity of the first or second inverter. The cabin temperature heat exchanger fan 9 is mounted at the second end of the cabin temperature heat exchanger 8. During heat dissipation, the main air duct fan 7 in the first and second inverters is turned on, drawing airflow from the outside air into the main air duct through the air inlets at both ends. After passing through the cabin temperature heat exchanger 8 at one end of the main air duct, part of the drawn airflow flows from the middle of the main air duct through the main power radiator 6, and then flows downwards to the first and second inductors for heat dissipation. The airflow channel is the main heat dissipation air duct, and the airflow direction in the main heat dissipation air duct is as follows: Figure 4 As shown in a1, the first inverter and the second inverter on both sides of the main power heat sink 6 share the main heat dissipation air duct.

[0038] Meanwhile, within the cavities of the first and second inverters, one end of the airflow baffle 10 is connected to the cabin temperature heat exchanger 8, and the other end is connected to the DC switch inside the inverter, thus creating airflow circulation paths within the cabins of the first and second inverters, which are also cavity heat dissipation channels. For the first inverter side, part of the external airflow entering the main air duct flows through the main power radiator 6, while the other part is drawn into the cavity heat dissipation channel of the first inverter cavity through the cabin temperature heat exchanger 8 and cabin temperature heat exchanger fan 9, thereby dissipating heat within the first inverter cavity. The airflow direction in the first inverter is as follows: Figure 4As shown in b1. For the second inverter, another part of the airflow after entering the main air duct is drawn into the cavity heat dissipation channel of the second inverter cavity through the cabin temperature heat exchanger 8 and cabin temperature heat exchanger fan 9 placed in the cavity of the second inverter, thereby performing cavity heat dissipation on the second inverter.

[0039] In this embodiment, by placing the main air duct fan 7 externally near the air inlet to draw air into the air duct, and placing the chamber temperature heat exchanger 8 inside the main air duct near the air inlet, not only can the first inverter and the second inverter share the main heat dissipation air duct for heat dissipation, but the main heat dissipation air duct can also dissipate heat from the inductor group 2. By using fewer structural components, not only is the structural utilization rate improved, but the cost can also be reduced. In addition, it can also form an internal heat dissipation channel for the first inverter and the second inverter, and achieve heat dissipation by drawing external air into their respective cavities, so as to ensure the operational stability of the first inverter and the second inverter.

[0040] Example 6 Combination Figure 5 As shown, in some optional embodiments, based on the above embodiment five, the main air duct fan 7 is respectively disposed on the top of the main power heat sink 6 between the first inverter and the second inverter. The main air duct fan 7 draws air inward, and the external airflow is drawn into the main air duct fan 7 from the main air duct between the first inverter and the second inverter, and then flows through the main power heat sink 6 and the inductor group 2 to form the main heat dissipation air duct.

[0041] As another possible implementation, the cabin temperature heat exchangers 8 are still located in the air inlets of the first inverter and the second inverter, respectively. The first end of the cabin temperature heat exchanger 8 extends into the main air duct, and the second end extends into the first or second inverter. Cabin temperature heat exchanger fans 9 are located at the second end of the cabin temperature heat exchangers 8. That is, based on Embodiment 5, the location of the cabin temperature heat exchangers 8 is not changed. The main air duct fans 7 are respectively installed inside the top of the main power radiator 6 between the first and second inverters. At this time, external airflow enters through the air inlet of the main air duct, exchanges heat through the cabin temperature heat exchanger 8 located at one end of the main air duct, and draws in cold air. After the cold airflow reaches the top of the main power radiator 6, it is drawn in by the main air duct fans 7. A portion of the airflow then flows through the main power radiator 6 and diffuses towards the first and second inductors to form the main heat dissipation air duct. The main heat dissipation air duct is used to dissipate heat from the first inductor, the second inductor, the first inverter, and the second inverter. The airflow direction of the main heat dissipation duct is as follows: Figure 5 As shown in a2.

[0042] In this embodiment, for the first inverter side, part of the airflow drawn in by the main air duct fan 7 at the top of the main power radiator 6 flows through the main power radiator 6, while the other part is drawn into the cavity heat dissipation channel of the first inverter cavity through the chamber temperature heat exchanger 8 and chamber temperature heat exchanger fan 9 placed inside the first inverter cavity, thereby performing cavity heat dissipation for the first inverter. The airflow direction in the first inverter is as follows: Figure 5 As shown in b2. For the second inverter, another part of the airflow drawn in by the main air duct fan 7 at the top of the main power radiator 6 is drawn into the cavity heat dissipation channel of the second inverter cavity through the cavity heat exchanger 8 and the cavity heat exchanger fan 9 placed inside the cavity of the second inverter, thereby performing cavity heat dissipation of the second inverter.

[0043] In this embodiment, by embedding the main air duct fan 7 on top of the main power heat sink 6 between the first inverter and the second inverter, and placing the chamber temperature heat exchanger 8 inside the main air duct near the air inlet, the first inverter and the second inverter can share the main heat dissipation air duct for heat dissipation. The main heat dissipation air duct can also dissipate heat from the inductor group 2. By using fewer structural components, not only is the structural utilization rate improved, but the cost is also reduced. In addition, the cavity heat dissipation can be achieved by drawing in external airflow into the cavity of the first inverter and the second inverter based on the cavity heat dissipation channel, so as to ensure the working stability of the first inverter and the second inverter.

[0044] Example 7 Combination Figure 6 As shown, in some optional embodiments, based on embodiment five, the cabin temperature heat exchanger 8 is installed on top of the main power heat sink 6 between the first inverter and the second inverter to form an airflow heat exchange channel with opposite airflow directions, and the cabin temperature heat exchanger fan 9 is respectively installed in the first inverter and the second inverter on the side close to the main air duct fan 7. Air is drawn in through the cabin temperature heat exchanger fan 9, and the external airflow circulates and dissipates heat within the dual cavities between the cavity heat dissipation channels in the first and second inverters and the airflow heat exchange channel formed by the cabin temperature heat exchanger 8.

[0045] As another possible implementation, the main air duct fan 7 is still externally mounted at the air inlets of the first inverter and the second inverter, respectively. The cabin temperature heat exchanger fan 9 is respectively mounted inside the first inverter and the second inverter on the side close to the main air duct fan 7. That is, based on embodiment five, the mounting positions of the main air duct fan 7 and the cabin temperature heat exchanger fan 9 are not changed. The cabin temperature heat exchanger 8 is internally mounted on top of the main power heat sink 6 between the first inverter and the second inverter. Specifically, the cabin temperature heat exchangers 8 in both the first inverter and the second inverter can be mounted on top of the main power heat sink 6, forming airflow heat exchange channels with opposite flow directions based on the two cabin temperature heat exchangers 8.

[0046] At this time, external airflow is drawn into the main air duct through the main air duct radiator. After passing through the cabin temperature heat exchanger 8, a portion of the external airflow in the main duct flows through the main power radiator 6 and then diffuses to the inductor group 2 for heat dissipation, forming the main heat dissipation channel. The corresponding airflow direction in the main heat dissipation channel is as follows: Figure 6 As shown in a3. For the compartments of the first and second inverters, the external airflow in the main channel passes through the compartment temperature heat exchanger 8, and another part flows through the airflow heat exchange channel formed by the upper compartment temperature heat exchanger 8, passing through the sequential compartment temperature heat exchanger fan 9 of the second inverter, and then flowing in the heat dissipation channel within the cavity of the second inverter. When it flows to the lower compartment temperature heat exchanger 8, it flows through the airflow heat exchange channel formed by the lower compartment temperature heat exchanger 8 into the cavity of the first inverter, flowing in the heat dissipation channel within the cavity of the first inverter until it reaches the compartment temperature heat exchanger fan 9 in the first inverter, and then flows through the airflow heat exchange channel formed by the upper compartment temperature heat exchanger 8, forming an intracavity circulating heat dissipation within the cavities of the first and second inverters. The airflow direction of the intracavity circulating heat dissipation is as follows... Figure 6 As shown in b3.

[0047] What needs to be known is that Figures 4 to 6 The dashed arrows in the diagram indicate the direction of airflow in the inverter.

[0048] In this embodiment, by embedding the chamber heat exchanger 8 inside the top of the main power heat sink 6 between the first inverter and the second inverter, and externally mounting the main air duct fan 7 at the air inlets of the first inverter and the second inverter, the first inverter and the second inverter can share the main heat dissipation air duct for heat dissipation. The main heat dissipation air duct can also dissipate heat from the inductor group 2. By using fewer structural components, not only is the structural utilization rate improved, but the cost is also reduced. In addition, an intracavity circulation heat dissipation can be formed within the chambers of the first inverter and the second inverter to ensure the operational stability of the first inverter and the second inverter.

[0049] Example 8 Combination Figure 3 and Figure 7 As shown, in some optional embodiments, based on any of the embodiments 2 to 7 above, the first inverter and the second inverter respectively further include a DC input copper bus, a DC fuse 11, a DC disconnect switch 12, a bus capacitor 13, and an inverter module; One end of the DC input copper busbar is connected to the power supply device, and the other end of the DC input copper busbar is connected to one end of the DC fuse 11. The other end of the DC fuse 11 is connected to one end of the DC disconnect switch 12. The other end of the DC disconnect switch 12 is connected to one end of the bus capacitor 13. The other end of the bus capacitor 13 is connected to the inverter module, and the inverter module generates AC power and outputs it to the power grid.

[0050] In the inverter, the connections between the DC input copper busbar (not shown in the figure), DC fuses 11 (F1~F4), DC disconnect switches 12 (K4 and K5), bus capacitors 13 (C1 and C2), and the inverter module (DCAC) are close and orderly. Among them, the DC input copper busbar is the main conductive component on the DC side of the inverter, responsible for introducing electrical energy from external power supply devices, such as photovoltaic panels, into the inverter.

[0051] The aforementioned DC fuse 11 is connected between the DC input copper busbar and the DC disconnect switch 12, serving as overcurrent protection. When an abnormal situation such as overcurrent occurs in the circuit, the fuse will automatically melt and disconnect the circuit, preventing equipment damage or fire.

[0052] One end of the aforementioned DC disconnect switch 12 is connected to the DC fuse 11, and the other end is connected to the bus capacitor 13. It is used to isolate the DC side separately without cutting off the AC power supply when needed, so as to ensure the safety of operators and the convenience of equipment maintenance.

[0053] The aforementioned bus capacitor 13 is connected to the inverter module on the DC side after the DC disconnect switch 12. By receiving DC power after being controlled by the disconnect switch, it plays the role of energy storage and smoothing voltage fluctuations. It can absorb and release electrical energy, reduce voltage ripple on the DC bus, and improve the output voltage quality of the inverter.

[0054] The aforementioned inverter module, as the core component of the inverter, is responsible for converting direct current (DC) to alternating current (AC). It receives smoothed DC power from bus capacitor 13 and generates AC output through high-frequency switching operations using internal power switching devices, such as insulated-gate bipolar transistors (IGBTs). The output of the inverter module is connected to inductors, which then supply AC power to the power grid or electrical equipment. An AC circuit breaker (K1-K3) is connected between each inductor (L1-L3) and the power grid to control the connection and disconnection of the connected circuits.

[0055] In this embodiment, the DC input copper busbar, DC fuse 11, DC disconnect switch 12, bus capacitor 13, and inverter module are connected in sequence to receive DC power input from the power supply device and convert it into AC power for the power grid or electrical equipment. Furthermore, the DC fuse 11 and DC disconnect switch 12 can disconnect the DC side circuit for circuit protection, and the bus capacitor 13 can reduce voltage ripple on the DC bus, improving the output voltage quality of the inverter.

[0056] Example 9 Combination Figure 4As shown, in some optional embodiments, based on the above embodiment eight, the first inverter and the second inverter respectively further include an AC filter capacitor, which is connected to the inverter module.

[0057] In this embodiment, an AC filter capacitor (not shown in the figure) can also be connected to the output terminal of the inverter module. That is, an AC filter capacitor is connected on the AC side, which can be used to filter out high-frequency noise and spurious waves, stabilize voltage and current in AC circuits, and provide a stable AC power output for the power grid or electrical equipment.

[0058] Example 10 This utility model embodiment also provides an inverter system, including a power supply device, a power grid, and an inverter assembly as described in embodiments one to nine above, with one end of the inverter assembly connected to the power supply device and the other end connected to the power grid.

[0059] The power supply device can be a photovoltaic module or other power generation component. By connecting one end of the inverter component to the power supply device and the other end to the power grid, the inverter component can convert the DC power collected and input by the power supply device into AC power for output to the power grid. Since the inverter system includes the aforementioned inverter component, the power supply system provided in this embodiment can also implement the various embodiments of the inverter component and achieve the corresponding technical effects, which will not be elaborated further here.

[0060] The terms "first," "second," etc., used in the specification, claims, or accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a variable relationship describing the related objects, indicating that three relationships can exist. For example, "and / or B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "Contains A, B, and C", "Contains A, B, and C" means that all three A, B, and C are contained; "Contains A, B, or C" means that one of A, B, and C is contained; "Contains A, B, and / or C" means that any one, two, or three of A, B, and C are contained.

[0062] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inverter assembly, characterized in that, It includes multiple inverter units, inductor groups, and AC power distribution equipment; among which, The inverter body includes multiple inverters, and the inductor group includes the same number of inductors as the inverters in the inverter body. One end of the inverter is connected to the power supply device, and the other end of the inverter is connected to the inductor. The inductor group is mounted on the parallel base. The AC power distribution device includes circuit breakers arranged in the same number as the inductors. One end of the circuit breaker is connected to the inductors, and the other end of the circuit breaker is connected to the power grid. The circuit breakers in the AC power distribution device are used to control the line where the faulty inverter is located to disconnect in order to isolate the fault when any of the inverters fails.

2. An inverter assembly according to claim 1, characterized in that, Each inverter body includes a first inverter and a second inverter. A main power heat sink is provided between the first inverter and the second inverter. A cavity is formed between the first inverter, the second inverter and the main power heat sink. The inductor group is inserted into the cavity to connect with the inverter body.

3. An inverter assembly according to claim 2, characterized in that, The inductor group on the same parallel base includes a first inductor and a second inductor, the first inductor being connected to the first inverter and the second inductor being connected to the second inverter.

4. An inverter assembly according to claim 2, characterized in that, The first inverter and the second inverter each include a main air duct fan, a cabin temperature heat exchanger, a cabin temperature heat exchanger fan, and an airflow baffle. By changing the setting of the main air duct fan and the cabin temperature heat exchanger, different heat dissipation channels are formed based on the main air duct fan, the cabin temperature heat exchanger, the cabin temperature heat exchanger fan, and the airflow baffle.

5. An inverter assembly according to claim 4, characterized in that, The main air duct fan is externally installed at the air inlet of the first inverter and the second inverter respectively. The cabin temperature heat exchanger is installed inside the air inlet of the first inverter and the second inverter respectively. The first end of the cabin temperature heat exchanger extends into the main air duct, and the second end extends into the first inverter or the second inverter. The cabin temperature heat exchanger fan is installed at the second end of the cabin temperature heat exchanger. External airflow enters the main air duct from the main air duct fan of the first inverter and the second inverter, and then flows through the main power heat sink and the inductor group to form the main heat dissipation air duct; The cavities of the first inverter and the second inverter are isolated by the airflow baffles to form their respective cavity heat dissipation channels. External airflow enters their respective cavity heat dissipation channels through the cabin temperature heat exchanger and the cabin temperature heat exchanger fan for cavity heat dissipation.

6. An inverter assembly according to claim 5, characterized in that, The main air duct fan is respectively installed on the top of the main power heat sink between the first inverter and the second inverter. The main air duct fan draws air inward, and the external airflow is drawn into the main air duct fan from the main air duct between the first inverter and the second inverter, and then flows through the main power heat sink and the inductor group to form the main heat dissipation air duct.

7. An inverter assembly according to claim 5, characterized in that, The cabin temperature heat exchanger is installed on top of the main power radiator between the first inverter and the second inverter to form an airflow heat exchange channel with opposite airflow directions. The cabin temperature heat exchanger fan is installed in the first inverter and the second inverter on the side close to the main air duct fan. Air is drawn inward by the fan of the cabin temperature heat exchanger, and the external airflow circulates and dissipates heat within the dual cavities between the cavity heat dissipation channels in the first inverter and the second inverter and the airflow heat exchange channel formed by the cabin temperature heat exchanger.

8. An inverter assembly according to any one of claims 2 to 7, characterized in that, The first inverter and the second inverter each further include a DC input copper busbar, a DC fuse, a DC disconnect switch, a bus capacitor, and an inverter module; One end of the DC input copper busbar is connected to the power supply device, the other end of the DC input copper busbar is connected to one end of the DC fuse, the other end of the DC fuse is connected to one end of the DC disconnect switch, the other end of the DC disconnect switch is connected to one end of the bus capacitor, and the other end of the bus capacitor is connected to the inverter module. The inverter module generates AC power and outputs it to the power grid.

9. An inverter assembly according to claim 8, characterized in that, The first inverter and the second inverter each further include an AC filter capacitor, which is connected to the inverter module.

10. An inverter system, characterized in that, It includes a power supply device, a power grid, and an inverter assembly as described in any one of claims 1 to 9, wherein one end of the inverter assembly is connected to the power supply device and the other end is connected to the power grid.

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