Filter of photovoltaic energy storage integrated machine and photovoltaic energy storage integrated machine

Abstract

The application provides a filter of a photovoltaic energy storage all-in-one machine and the photovoltaic energy storage all-in-one machine, and the filter comprises: a photovoltaic input filter comprising a first input filter unit; a battery input filter comprising a second input filter unit; a power grid output filter comprising a first output filter unit; an off-grid output filter comprising a second output filter unit; wherein each filter unit comprises a magnetic core and power windings and auxiliary windings arranged on both sides of the magnetic core, the first input filter unit of the photovoltaic input filter is connected with the second input filter unit of the battery input filter and is grounded; the first output filter unit of the power grid output filter is connected with the second output filter unit of the battery input filter and is grounded; wherein the application can effectively suppress noise in multiple working modes, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the photovoltaic technology field, and especially relates to a filter of a photovoltaic energy storage all-in-one machine and the photovoltaic energy storage all-in-one machine. BACKGROUND

[0002] In the photovoltaic energy storage all-in-one machine, the design of the filter is crucial to ensure the electromagnetic compatibility (EMC) of the system. The traditional filter usually adopts a single inductance and capacitance combination, which can meet the EMC requirements in a specific working mode, but its performance cannot remain consistent in multi-mode operation (such as grid-connected, off-grid, standby power supply, etc.). Especially in the application scenario of multiple groups of strings, due to the uneven impedance distribution of each group of strings, the internal magnetic field of the magnetic core is unbalanced, which further generates common-mode noise, affecting the stability and efficiency of the system. In addition, in order to deal with the EMC problem in different working modes, the traditional filter usually needs to increase additional magnetic devices, which not only increases the volume and cost of the system, but also reduces the overall reliability. Therefore, there is a need to design a filter that can effectively suppress noise, reduce the use of magnetic devices, and reduce the complexity of the system in multiple working modes. SUMMARY

[0003] The embodiment of the present application provides a filter of a photovoltaic energy storage all-in-one machine and the photovoltaic energy storage all-in-one machine, which can effectively suppress noise, reduce the use of magnetic devices, and reduce the complexity of the system in multiple working modes, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

[0004] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present application provides a filter of a photovoltaic energy storage all-in-one machine, comprising:

[0005] The photovoltaic input filter comprises a first input filter unit;

[0006] The battery input filter comprises a second input filter unit;

[0007] The grid output filter comprises a first output filter unit;

[0008] The off-grid output filter comprises a second output filter unit;

[0009] Wherein, each filter unit comprises a magnetic core and power windings and auxiliary windings arranged on both sides of the magnetic core, the first input filter unit of the photovoltaic input filter is connected with the second input filter unit of the battery input filter and grounded, and the first output filter unit of the grid output filter is connected with the second output filter unit of the battery input filter and grounded.

[0010] In some embodiments, the first input filter unit and the second input filter unit are connected at one end close to each other, and are connected at the other end away from each other.

[0011] In some embodiments, the first input filter unit and the second input filter unit are connected at one end close to each other, and are grounded through a first capacitor at the other end.

[0012] In some embodiments, the first output filter unit and the second output filter unit are connected at one end close to each other, and are connected at the other end away from each other.

[0013] In some embodiments, the first output filter unit and the second output filter unit are connected at one end close to each other, and are grounded through a third capacitor at the other end.

[0014] In some embodiments, the first input filter unit comprises a first left auxiliary winding and a first right auxiliary winding, the second input filter unit comprises a second left auxiliary winding and a second right auxiliary winding, the first right auxiliary winding is connected to the second left auxiliary winding, and the first left auxiliary winding is connected to the second right auxiliary winding.

[0015] In some embodiments, the first output filter unit comprises a third left auxiliary winding and a third right auxiliary winding, the second output filter unit comprises a fourth left auxiliary winding and a fourth right auxiliary winding, the third right auxiliary winding is connected to the fourth left auxiliary winding, and the third left auxiliary winding is connected to the fourth right auxiliary winding.

[0016] In some embodiments, the first input filter unit, the second input filter unit, the first output filter unit, and the second output filter unit are each provided with a left power winding and a right power winding.

[0017] In some embodiments, the first input filter unit, the second input filter unit, the first output filter unit, and the second output filter unit are each provided with the same layout of the auxiliary winding and the power winding.

[0018] To achieve the above object, a second aspect of the embodiments of the present application provides a photovoltaic energy storage all-in-one machine, comprising a filter of the photovoltaic energy storage all-in-one machine as described in any one of the first aspect embodiments.

[0019] The embodiment of the present application provides a filter of a photovoltaic energy storage all-in-one machine and the photovoltaic energy storage all-in-one machine, and at least has the following beneficial effects: the present application provides a filter of a photovoltaic energy storage all-in-one machine, wherein each filter unit comprises a magnetic core and a power winding and an auxiliary winding arranged on both sides of the magnetic core; specifically, the first input filter unit of the photovoltaic input filter is connected with the second input filter unit of the battery input filter and grounded, and the first output filter unit of the grid output filter is also connected with the second output filter unit of the off-grid output filter and grounded, so that the auxiliary windings in the filter units are connected with each other to form a new common-mode current cancellation system, so that the residual magnetic of each group of strings is the same, thereby effectively reducing the magnetic field imbalance in the magnetic core and suppressing the noise source. In addition, the power winding and the auxiliary winding in the filter unit are arranged in the same way, ensuring the consistency and stability of the filtering effect in different working modes. Compared with the prior art, the filter of the present application can not only significantly reduce the use of magnetic devices, reduce the volume and cost of the system, but also improve the filtering performance, so that the machine can meet the EMC safety specification in multiple working modes, effectively suppress noise in multiple working modes, reduce the use of magnetic devices, and reduce the system complexity, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The connection relationship diagram of the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application is provided.

[0021] Figure 2 Another connection relationship diagram of the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application is provided.

[0022] Figure 3 In the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application, the specific diagram of the photovoltaic input filter is provided.

[0023] Figure 4 In the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application, the specific diagram of the battery input filter is provided.

[0024] Figure 5 In the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application, the specific diagram of the grid output filter is provided.

[0025] Figure 6 In the filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application, the specific diagram of the off-grid output filter is provided.

[0026] Figure 7 The specific diagram of the whole filter of the photovoltaic energy storage all-in-one machine provided by the embodiment of the present application is provided.

[0027] Reference signs:

[0028] 100, photovoltaic input filter; 110, first input filter unit; 200, battery input filter; 210, second input filter unit; 300, grid output filter; 310, third input filter unit; 400, off-grid output filter; 410, fourth input filter unit. DETAILED DESCRIPTION

[0029] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0030] In some embodiments, although the functional modules are divided in the system schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a different order than the module division in the system or the order in the flowchart. The terms first, second, etc. in the specification and claims and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0031] In addition, unless otherwise explicitly specified and limited, the term "connection / connected" should be understood broadly, for example, it can be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium.

[0032] In the description of the embodiments of the present application, the description of the terms "one embodiment / implementation", "another embodiment / implementation" or "some embodiments / implementation", "in the above-described embodiment / implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are contained in at least two embodiments or implementations disclosed in the present application. The illustrative description of the above terms in the present application does not necessarily refer to the same embodiment or implementation. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described can be performed in a different order than the order in the flowchart.

[0033] Currently, in the photovoltaic energy storage all-in-one machine, the design of the filter is crucial to ensure the electromagnetic compatibility (EMC) of the system. Traditional filters usually use a single combination of inductance and capacitance, although they can meet the EMC requirements in a specific operating mode, but in multi-mode operation (such as grid-connected, off-grid, backup power, etc.), their performance often cannot remain consistent. Especially in the application scenario of multiple groups of strings, due to the uneven impedance distribution of each group of strings, the internal magnetic field of the magnetic core is unbalanced, which further generates common-mode noise, affecting the stability and efficiency of the system. In addition, in order to deal with the EMC problem in different operating modes, the traditional filter usually needs to increase additional magnetic devices, which not only increases the volume and cost of the system, but also reduces the overall reliability. Therefore, there is a need to design a filter that can effectively suppress noise, reduce the use of magnetic devices, and reduce the complexity of the system in multiple operating modes.

[0034] Based on this, the embodiments of the present application provide a filter for a photovoltaic energy storage all-in-one machine and a photovoltaic energy storage all-in-one machine, which can effectively suppress noise, reduce the use of magnetic devices, and reduce the complexity of the system in multiple operating modes, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

[0035] The scheme of the present application will be further described below with reference to the accompanying drawings.

[0036] Reference Figures 1 to 7 , Figure 1 The connection relationship diagram of the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 2 Another connection relationship diagram of the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 3 The specific diagram of the photovoltaic input filter in the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 4 The specific diagram of the battery input filter in the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 5 The specific diagram of the grid output filter in the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 6 The specific diagram of the off-grid output filter in the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure; Figure 7 The specific diagram of the filter for the photovoltaic energy storage all-in-one machine provided by an embodiment of the present application is shown in the figure.

[0037] The embodiments of the present application provide a filter for a photovoltaic energy storage all-in-one machine and a photovoltaic energy storage all-in-one machine, which can effectively suppress noise, reduce the use of magnetic devices, and reduce the complexity of the system in multiple operating modes, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

[0038] To achieve the above object, the first aspect of the embodiment of the present application provides a filter of a photovoltaic energy storage all-in-one machine, comprising: a photovoltaic input filter 100 comprising a first input filter unit 110; a battery input filter 200 comprising a second input filter unit 210; a grid output filter 300 comprising a first output filter unit 310; an off-grid output filter 400 comprising a second output filter unit 410;

[0039] Wherein each filter unit comprises a magnetic core and power windings and auxiliary windings arranged on both sides of the magnetic core, the first input filter unit 110 of the photovoltaic input filter 100 is connected with the second input filter unit 210 of the battery input filter 200 and grounded; the first output filter unit 310 of the grid output filter 300 is connected with the second output filter unit 410 of the battery input filter 200 and grounded.

[0040] Wherein it can be understood that each filter unit comprises a magnetic core and power windings and auxiliary windings arranged on both sides of the magnetic core; specifically, the first input filter unit 110 of the photovoltaic input filter 100 is connected with the second input filter unit 210 of the battery input filter 200 and grounded, and the first output filter unit 310 of the grid output filter 300 is also connected with the second output filter unit 410 of the off-grid output filter 400 and grounded, which design makes the present application form a new common-mode current cancellation system by connecting the auxiliary windings in each filter unit with each other, so that the residual magnetic of each group of strings adds up to be the same, thereby effectively reducing the magnetic field imbalance inside the magnetic core and suppressing the noise source. In addition, the power windings and the auxiliary windings in the filter unit have the same layout, ensuring the consistency and stability of the filtering effect in different working modes. Compared with the prior art, the filter of the present application not only can significantly reduce the use of magnetic devices, reduce the volume and cost of the system, but also can improve the filtering performance, so that the machine can meet the EMC safety specification in multiple working modes, can effectively suppress noise in multiple working modes, reduce the use of magnetic devices, and reduce the system complexity, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

[0041] In some embodiments, the first input filter unit 110 and the second input filter unit 210 are connected at one end close to each other; the first input filter unit 110 and the second input filter unit 210 are connected at one end away from each other.

[0042] In some embodiments, the first input filter unit 110 and the second input filter unit 210 are connected at one end close to each other and grounded through a first capacitor; the first input filter unit 110 and the second input filter unit 210 are connected at one end away from each other and grounded through a second capacitor.

[0043] In some embodiments, the ends of the first output filter unit 310 and the second output filter unit 410 that are close to each other are connected; the ends of the first output filter unit 310 and the second output filter unit 410 that are far from each other are connected.

[0044] In some embodiments, the ends of the first output filter unit 310 and the second output filter unit 410 that are close to each other are connected and grounded through a third capacitor; the ends of the first output filter unit 310 and the second output filter unit 410 that are far from each other are connected and grounded through a fourth capacitor.

[0045] In some embodiments, the first input filtering unit 110 includes a first left auxiliary winding and a first right auxiliary winding, and the second input filtering unit 210 includes a second left auxiliary winding and a second right auxiliary winding. The first right auxiliary winding is connected to the second left auxiliary winding, and the first left auxiliary winding is connected to the second right auxiliary winding.

[0046] In some embodiments, the first output filtering unit 310 includes a third left auxiliary winding and a third right auxiliary winding, and the second output filtering unit 410 includes a fourth left auxiliary winding and a fourth right auxiliary winding. The third right auxiliary winding is connected to the fourth left auxiliary winding, and the third left auxiliary winding is connected to the fourth right auxiliary winding.

[0047] In some embodiments, the first input filtering unit 110, the second input filtering unit 210, the first output filtering unit 310, and the second output filtering unit 410 are all provided with a left power winding and a right power winding.

[0048] In some embodiments, the auxiliary winding and the power winding in the first input filtering unit 110, the second input filtering unit 210, the first output filtering unit 310 and the second output filtering unit 410 have the same layout.

[0049] In some embodiments, such as Figure 3 As shown, the photovoltaic input filter 100 is used to suppress common-mode noise and differential-mode noise from the photovoltaic string, ensuring that the DC power generated by the photovoltaic system complies with electromagnetic compatibility (EMC) standards when entering the inverter or energy storage system. It protects subsequent circuits from interference by filtering out high-frequency noise. Specifically, the photovoltaic input filter 100 may include a first input filter unit 110, which includes a magnetic core, a left power winding, a right power winding, and an auxiliary winding, all wound on the same magnetic core to form a filter network.

[0050] In some embodiments, such as Figure 4As shown, the battery input filter 200 is used to suppress common mode noise and differential mode noise from the battery module, ensure that the direct current stored in the battery does not generate electromagnetic interference to the system during charging and discharging, and prevent external noise from entering the system through the battery loop; Specifically, the battery input filter 200 can include a second input filter unit 210, which also includes a magnetic core, a left power winding, a right power winding, and an auxiliary winding, the design of these windings is similar to the photovoltaic input filter 100, which ensures the overall filtering effect of the system.

[0051] In some embodiments, as shown in FIG. 4, Figure 5 As shown, the grid output filter 300 is used to suppress common mode noise and differential mode noise from the inverter output to the grid, ensure that the alternating current output by the inverter meets the standard requirements of the grid, and reduce the harmonic pollution of the inverter to the grid, improve the electromagnetic compatibility of the system; Specifically, the grid output filter 300 can include a first output filter unit 310, which includes a magnetic core, a left power winding, a right power winding, and an auxiliary winding to ensure the quality of the current and voltage output by the inverter.

[0052] In some embodiments, as shown in FIG. 4, Figure 6 As shown, the off-grid output filter 400 is used to suppress common mode noise and differential mode noise from the inverter output to the local load, ensure that the inverter provides high-quality alternating current to the load in off-grid mode, and maintain the stability and reliability of the system in off-grid mode; Specifically, the off-grid output filter 400 can include a second output filter unit 410, which also includes a magnetic core, a left power winding, a right power winding, and an auxiliary winding to ensure electromagnetic compatibility and current quality in off-grid mode.

[0053] In some embodiments, each filter unit in this application is the core component of the filter, which is responsible for suppressing noise on a specific path. The filter unit forms an efficient filtering network through its internal magnetic core, power winding, and auxiliary winding, which can effectively filter out noise without affecting normal current transmission; Wherein the magnetic core is the central component of the filter unit, which is used to concentrate the magnetic field and enhance the filtering effect of the inductor. The selection and design of the magnetic core directly affect the performance and efficiency of the filter; The power winding is used to transmit the energy of photovoltaic, battery or inverter, which is divided into left and right power windings, respectively connected to different electrical paths to ensure stable energy transmission; The auxiliary winding is used to form a common mode current cancellation system to reduce the magnetic field imbalance inside the magnetic core, thereby suppressing the noise source. The auxiliary winding of each filter unit in this application is divided into left and right auxiliary windings, and the mutual cancellation of common mode current is realized through the connection mode of input common inductance connection and output common inductance connection.

[0054] As shown in FIG. 4, Figure 7As shown, it can be understood that the first input filter unit 110 and the second input filter unit 210 are connected at one end close to each other and grounded through the first capacitor C1, and are also connected at one end far away from each other and grounded through the second capacitor C2, so that the two filter units can jointly suppress common mode noise while maintaining their respective independence.

[0055] Correspondingly, the first output filter unit 310 and the second output filter unit 410 are connected at one end close to each other and grounded through the third capacitor C3, and are also connected at one end far away from each other and grounded through the fourth capacitor C4, so that the two output filter units can work together in grid-connected and off-grid modes to ensure the electromagnetic compatibility of the system.

[0056] Further, in the input filter unit, the first right auxiliary winding is connected with the second left auxiliary winding, and the first left auxiliary winding is connected with the second right auxiliary winding; in the output filter unit, the third right auxiliary winding is connected with the fourth left auxiliary winding, and the third left auxiliary winding is connected with the fourth right auxiliary winding, to form a common mode current cancellation system, reduce the magnetic field imbalance inside the magnetic core, and thus suppress the noise source.

[0057] In some embodiments, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 can be safety X capacitors and safety Y capacitors respectively, for example, the first capacitor C1 and the third capacitor C3 are safety X capacitors, and the second capacitor C2 and the fourth capacitor C4 are safety Y capacitors.

[0058] Among them, the X capacitor is mainly used to suppress common mode noise, connected between the power line and the ground, which can effectively filter out high-frequency noise and ensure the electromagnetic compatibility of the system, in the present application, the X capacitor is used to connect the two ends of the photovoltaic input filter 100 and the battery input filter 200 and grounded to suppress common mode noise; the Y capacitor is mainly used to suppress differential mode noise, connected between the power lines, which can effectively filter out low-frequency noise and ensure the electromagnetic compatibility of the system, in the present application, the Y capacitor is used to connect the two ends of the grid output filter 300 and the off-grid output filter 400 and grounded to suppress differential mode noise.

[0059] In some embodiments, it can be understood that, since each filter unit in the present application includes a magnetic core and power windings and auxiliary windings arranged on both sides of the magnetic core, by introducing the auxiliary windings, a common-mode current cancellation system is formed, the magnetic field imbalance inside the magnetic core is reduced, and the common-mode noise is effectively suppressed. This design enables the filter to maintain stable filtering effect in multiple operating modes, ensuring that the system meets the EMC safety specifications. Further, the auxiliary windings of the first input filter unit 110 and the second input filter unit 210 are connected to each other to form a new common-mode current cancellation system. Similarly, the auxiliary windings of the first output filter unit 310 and the second output filter unit 410 are also connected to each other. This design further enhances the suppression of common-mode noise, especially in multi-path group string application scenarios, effectively reducing interference between groups.

[0060] In some embodiments, it can be understood that, since the structure of the filter unit is optimized, especially the layout of the auxiliary windings and the power windings, the filter of the present application can significantly reduce the use of magnetic devices without affecting energy transmission. Compared with traditional filters, the volume of the filter of the present application is reduced by at least 50%, and the cost is reduced by at least 50%. This not only reduces the complexity of the system, but also improves the overall reliability. In addition, by reasonably configuring the safety X capacitor and Y capacitor, the EMC performance of the filter is further enhanced, and the need for additional magnetic devices is reduced. These capacitors not only suppress noise, but also improve system stability and safety.

[0061] In some embodiments, it can be understood that, since the first input filter unit 110 and the second input filter unit 210, the first output filter unit 310 and the second output filter unit 410 are connected to each other at one end and the other end, respectively, and grounded through a capacitor, a high-efficiency filter network is formed. This design enables the filter to maintain consistent filtering effect in different operating modes, especially in multi-mode operation such as grid-connected and off-grid, and the filtering performance is significantly improved. Specifically, the filter performance of the present application is improved by at least 30dB compared with using a common-mode inductor for each group string. In addition, the design of the auxiliary windings makes the residual magnetism of each group string the same, thereby realizing mutual cancellation of common-mode current and further improving the filtering effect.

[0062] In some embodiments, it can be understood that the combination design of the photovoltaic input filter 100, the battery input filter 200, the grid output filter 300 and the off-grid output filter 400 in the application fully considers the needs of the photovoltaic energy storage all-in-one machine in various working modes, such as grid-connected, off-grid, backup power supply and the like. Through reasonable connection mode and capacitor configuration, the filter can maintain stable filtering effect in different working states, ensure that the system can meet the EMC safety specification in any case, and can be directly arranged inside the photovoltaic all-in-one machine, improve the EMC performance of the machine in various working modes, and at the same time reduce the cost and space occupation,

[0063] In some embodiments, the first input filter unit 110 of the photovoltaic input filter 100 and the second input filter unit 210 of the battery input filter 200 adopt the same magnetic core material and size to ensure the consistency of the filtering effect in different working modes. The magnetic core material can be selected from high-permeability ferrite or nanocrystalline material to improve the magnetic saturation capability and reduce the loss. Further, the end of the first input filter unit 110 and the end of the second input filter unit 210 close to each other are grounded through the first capacitor, and the end far away from each other is grounded through the second capacitor. The selection of the capacitor can be optimized according to the frequency characteristics of the system to ensure good filtering effect in the high frequency band.

[0064] In some embodiments, the first output filter unit 310 of the grid output filter 300 and the second output filter unit 410 of the off-grid output filter 400 also adopt the same magnetic core material and size to ensure the consistency of the filtering effect in grid-connected and off-grid modes. The selection of the magnetic core material should consider its performance in alternating current environment, and materials suitable for high frequency application should be selected, such as high-permeability ferrite or nanocrystalline material. Further, the end of the first output filter unit 310 and the end of the second output filter unit 410 close to each other are grounded through the third capacitor, and the end far away from each other is grounded through the fourth capacitor. This connection mode enables the two output filter units to work together in grid-connected and off-grid modes, ensuring the electromagnetic compatibility of the system. The selection of the capacitor can be optimized according to the frequency characteristics of the system to ensure good filtering effect in the low frequency band.

[0065] In some embodiments, a left power winding and a right power winding are arranged in each filter unit for transmitting the energy of photovoltaic, battery or inverter. The layout of the power winding and the auxiliary winding is symmetrical to reduce the magnetic field imbalance in the magnetic core and realize mutual cancellation of common mode current. The auxiliary winding should be designed to maintain a certain distance from the power winding to avoid the coupling effect between them affecting the filtering effect. In addition, the number of turns of the auxiliary winding can be optimized according to the noise frequency characteristics of the system to ensure good common mode noise suppression capability in the high frequency band.

[0066] In some embodiments, in order to ensure that the filter can maintain stable filtering effect in different working modes, the filter can further comprise a control system and a detection device, which are used to monitor the working state of each group of strings in real time and dynamically adjust the filtering parameters according to the monitoring results. The control system can monitor the current, voltage and temperature of each group of strings through sensors, collect and analyze the sensor data through a data acquisition unit, and automatically compensate the performance fluctuation caused by temperature change or other environmental factors. The detection device is used to measure the current of each group of strings, measure the voltage of each group of strings, and monitor the temperature inside the filter, so as to ensure the stability and reliability of the system.

[0067] In some embodiments, the magnetic core material of the filter can be selected from nanocrystalline material or ferrite material with high temperature resistance or high permeability, the shell of the filter is made of aluminum alloy material, and heat dissipation fins are added outside to enhance the heat dissipation effect.

[0068] To achieve the above-mentioned purpose, a second aspect of the embodiments of the present application provides a photovoltaic energy storage all-in-one machine comprising the filter of the photovoltaic energy storage all-in-one machine according to any one of the first aspect.

[0069] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A filter of a photovoltaic energy storage all-in-one machine, characterized in that, The application relates to a filter for a photovoltaic energy storage all-in-one machine. The filter comprises: a photovoltaic input filter comprising a first input filter unit; a battery input filter comprising a second input filter unit; a grid output filter comprising a first output filter unit; an off-grid output filter comprising a second output filter unit; wherein each filter unit comprises a magnetic core and a power winding and an auxiliary winding arranged on both sides of the magnetic core, the first input filter unit of the photovoltaic input filter is connected with the second input filter unit of the battery input filter and grounded, and the first output filter unit of the grid output filter is connected with the second output filter unit of the battery input filter and grounded; one end of the first input filter unit and the second input filter unit is connected to each other, and the other end of the first input filter unit and the second input filter unit is connected to each other.

2. The filter of the photovoltaic energy storage all-in-one machine according to claim 1, characterized in that, one end of the first input filter unit and the second input filter unit is connected to each other, and the other end of the first input filter unit and the second input filter unit is connected to each other through a first capacitor.

3. The filter of the photovoltaic energy storage all-in-one machine according to claim 2, characterized in that, one end of the first output filter unit and the second output filter unit is connected to each other, and the other end of the first output filter unit and the second output filter unit is connected to each other.

4. The filter of the photovoltaic energy storage all-in-one machine according to claim 1, characterized in that, one end of the first output filter unit and the second output filter unit is connected to each other, and the other end of the first output filter unit and the second output filter unit is connected to each other through a third capacitor.

5. The filter of the photovoltaic energy storage all-in-one machine according to claim 2, characterized in that, The first input filter unit comprises a first left auxiliary winding and a first right auxiliary winding, the second input filter unit comprises a second left auxiliary winding and a second right auxiliary winding, the first right auxiliary winding is connected with the second left auxiliary winding, and the first left auxiliary winding is connected with the second right auxiliary winding. 6.The filter of the photovoltaic energy storage all-in-one machine according to claim 1, characterized in that, The first output filter unit comprises a third left auxiliary winding and a third right auxiliary winding, the second output filter unit comprises a fourth left auxiliary winding and a fourth right auxiliary winding, the third right auxiliary winding is connected with the fourth left auxiliary winding, and the third left auxiliary winding is connected with the fourth right auxiliary winding. 7.The filter of the photovoltaic energy storage all-in-one machine according to claim 1, characterized in that, The first input filter unit, the second input filter unit, the first output filter unit and the second output filter unit are all provided with left power windings and right power windings.

8. A photovoltaic energy storage all-in-one machine, characterized in that, The auxiliary windings and the power windings in the first input filter unit, the second input filter unit, the first output filter unit and the second output filter unit are arranged in the same way. The application further relates to a filter for a photovoltaic energy storage all-in-one machine.

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