Filter of photovoltaic energy storage all-in-one machine and photovoltaic energy storage all-in-one machine

Abstract

The invention 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 which comprises a first input filtering unit; the battery input filter comprises a second input filtering unit; the power grid output filter comprises a first output filtering unit; the off-grid output filter comprises a second output filtering unit; wherein each filtering unit comprises a magnetic core, a power winding and an auxiliary winding, the power winding and the auxiliary winding are arranged on the two sides of the magnetic core, and the first input filtering unit of the photovoltaic input filter is connected with the second input filtering unit of the battery input filter and is grounded; a first output filtering unit of the power grid output filter is connected with a second output filtering unit of the battery input filter and is grounded; according to the photovoltaic energy storage all-in-one machine, noise can be effectively suppressed in multiple working modes, the EMC conduction problem in the multiple modes is solved, and it is ensured that the photovoltaic energy storage all-in-one machine can operate efficiently and stably.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic technology, and in particular to a filter of a photovoltaic energy storage integrated machine and a photovoltaic energy storage integrated machine. Background Art

[0002] In a photovoltaic energy storage integrated 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 inductors and capacitors. Although they can meet EMC requirements in specific operating modes, their performance is often inconsistent when operating in multiple modes (such as grid-connected, off-grid, backup power supply, etc.). Especially in the application scenario of multi-channel strings, due to the uneven impedance distribution of each string, the magnetic field inside the magnetic core is unbalanced, which in turn generates common-mode noise, affecting the stability and efficiency of the system. In addition, in order to deal with EMC problems in different operating modes, traditional filters usually need to add additional magnetic devices, which not only increases the size and cost of the system, but also reduces the overall reliability. Therefore, it is currently necessary to design a filter that can effectively suppress noise, reduce the use of magnetic devices, and reduce system complexity in multiple operating modes. Summary of the invention

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

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

[0005] A photovoltaic input filter, comprising a first input filter unit;

[0006] A battery input filter, comprising a second input filter unit;

[0007] A power grid output filter, comprising a first output filter unit;

[0008] An off-grid output filter, comprising a second output filter unit;

[0009] Wherein, each filter unit includes 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 to the second input filter unit of the battery input filter and is grounded; the first output filter unit of the grid output filter is connected to the second output filter unit of the battery input filter and is grounded.

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

[0011] In some embodiments, the first input filter unit and the second input filter unit are connected at ends close to each other and grounded through a first capacitor; the first input filter unit and the second input filter unit are connected at ends far away from each other and grounded through a second capacitor.

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

[0013] In some embodiments, the first output filter unit and the second output filter unit are connected at ends close to each other and grounded through a third capacitor; the first output filter unit and the second output filter unit are connected at ends far away from each other and grounded through a fourth capacitor.

[0014] In some embodiments, the first input filtering unit includes a first left auxiliary winding and a first right auxiliary winding, the second input filtering unit 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.

[0015] In some embodiments, the first output filter unit includes a third left auxiliary winding and a third right auxiliary winding, the second output filter unit 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.

[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, in the first input filter unit, the second input filter unit, the first output filter unit, and the second output filter unit, the layout settings of the auxiliary winding and the power winding are the same.

[0018] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a photovoltaic energy storage integrated machine, including a filter of the photovoltaic energy storage integrated machine as described in any one of the embodiments of the above-mentioned first aspect.

[0019] The embodiments of the present application provide a filter for a photovoltaic energy storage integrated machine and a photovoltaic energy storage integrated machine, which have at least the following beneficial effects: The present application provides a filter for a photovoltaic energy storage integrated machine, wherein each filter unit includes 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 to and grounded with the second input filter unit of the battery input filter, and the first output filter unit of the grid output filter is also connected to and grounded with the second output filter unit of the off-grid output filter. This design enables the present application to form a new common-mode current cancellation system by interconnecting the auxiliary windings in each filter unit, so that the residual magnetic field of each string is added 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 winding and auxiliary winding 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 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 comply with EMC safety regulations in multiple working modes, can effectively suppress noise in multiple working modes, reduce the use of magnetic devices, and reduce system complexity, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage integrated machine can operate efficiently and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the connection relationship of the filter of the photovoltaic energy storage integrated machine provided in one embodiment of the present application;

[0021] Figure 2 Another schematic diagram of the connection relationship of the filter of the photovoltaic energy storage integrated machine provided in one embodiment of the present application;

[0022] Figure 3 A specific schematic diagram of a photovoltaic input filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application;

[0023] Figure 4 A specific schematic diagram of a battery input filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application;

[0024] Figure 5 A specific schematic diagram of a grid output filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application;

[0025] Figure 6 A specific schematic diagram of an off-grid output filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application;

[0026] Figure 7 A detailed schematic diagram of the overall filter of a photovoltaic energy storage integrated machine provided in one embodiment of the present application.

[0027] Reference numerals:

[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 purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not 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 may 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, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] In addition, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the two can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium.

[0032] In the description of the embodiments of the present application, the description of reference terms "one embodiment / implementation", "another embodiment / implementation" or "certain embodiments / implementations", "in the above embodiments / implementations", etc. means that the specific features, structures, materials or characteristics described in combination with the implementation or example are included in at least two embodiments or implementations disclosed in the present application. In the disclosure of this application, the schematic representation of the above terms 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 may be performed in an order different from that in the flowchart.

[0033] At present, in photovoltaic energy storage integrated machines, the design of filters is crucial to ensure the electromagnetic compatibility (EMC) of the system. Traditional filters usually use a single combination of inductors and capacitors. Although they can meet EMC requirements in specific working modes, their performance is often inconsistent when operating in multiple modes (such as grid-connected, off-grid, backup power supply, etc.). Especially in the application scenario of multi-channel strings, due to the uneven impedance distribution of each string, the magnetic field inside the magnetic core is unbalanced, which in turn generates common-mode noise, affecting the stability and efficiency of the system. In addition, in order to deal with EMC problems in different working modes, traditional filters usually need to add additional magnetic devices, which not only increases the size and cost of the system, but also reduces the overall reliability. Therefore, it is currently necessary to design a filter that can effectively suppress noise, reduce the use of magnetic devices, and reduce system complexity in multiple working modes.

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

[0035] The present application scheme is further described below in conjunction with the accompanying drawings.

[0036] refer to Figures 1 to 7 , Figure 1 A schematic diagram of the connection relationship of the filter of the photovoltaic energy storage integrated machine provided in one embodiment of the present application; Figure 2 Another schematic diagram of the connection relationship of the filter of the photovoltaic energy storage integrated machine provided in one embodiment of the present application; Figure 3 A specific schematic diagram of a photovoltaic input filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application; Figure 4 A specific schematic diagram of a battery input filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application; Figure 5 A specific schematic diagram of a grid output filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application; Figure 6 A specific schematic diagram of an off-grid output filter in a filter of a photovoltaic energy storage integrated machine provided in an embodiment of the present application; Figure 7 A detailed schematic diagram of the overall filter of a photovoltaic energy storage integrated machine provided in one embodiment of the present application.

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

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

[0039] Each filter unit includes a magnetic core and a power winding and an auxiliary winding arranged on both sides of the magnetic core. The first input filter unit 110 of the photovoltaic input filter 100 is connected to the second input filter unit 210 of the battery input filter 200 and is grounded; the first output filter unit 310 of the grid output filter 300 is connected to the second output filter unit 410 of the battery input filter 200 and is grounded.

[0040] Among them, it can be understood that each filter unit includes 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 110 of the photovoltaic input filter 100 is connected to 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 to the second output filter unit 410 of the off-grid output filter 400 and grounded. This design allows the present application to form a new common-mode current cancellation system by connecting the auxiliary windings in each filter unit to each other, so that the residual magnetic field of each string is added 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 winding and auxiliary winding 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 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 comply with EMC safety regulations in multiple working modes, can effectively suppress noise in multiple working modes, reduce the use of magnetic devices, and reduce system complexity, solve the EMC conduction problem in multiple modes, and ensure that the photovoltaic energy storage integrated 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 ends close to each other; and the first input filter unit 110 and the second input filter unit 210 are connected at ends far away from each other.

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

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

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

[0045] In some embodiments, the first input filter unit 110 includes a first left auxiliary winding and a first right auxiliary winding, the second input filter 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 filter unit 310 includes a third left auxiliary winding and a third right auxiliary winding, the second output filter 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 filter unit 110 , the second input filter unit 210 , the first output filter unit 310 , and the second output filter unit 410 are each provided with a left power winding and a right power winding.

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

[0049] In some embodiments, Figure 3 As shown, the photovoltaic input filter 100 is used to suppress the common mode noise and differential mode noise from the photovoltaic string, ensuring that the direct current generated by the photovoltaic system meets the electromagnetic compatibility (EMC) standard when entering the inverter or energy storage system. It protects the 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, which are wound on the same magnetic core to form a filter network.

[0050] In some embodiments, 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 DC power stored in the battery does not generate electromagnetic interference to the system during the charging and discharging process, and prevent external noise from entering the system through the battery circuit; specifically, the battery input filter 200 may 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 that of the photovoltaic input filter 100, ensuring the overall filtering effect of the system.

[0051] In some embodiments, Figure 5 As shown, the grid output filter 300 is used to suppress the common-mode noise and differential-mode noise output by the inverter to the grid, ensure that the AC power output by the inverter meets the standard requirements of the grid, reduce the harmonic pollution of the inverter to the grid, and improve the electromagnetic compatibility of the system; specifically, the grid output filter 300 may 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 current and voltage quality of the inverter output.

[0052] In some embodiments, Figure 6 As shown, the off-grid output filter 400 is used to suppress the common-mode noise and differential-mode noise output by the inverter to the local load, ensure that the inverter provides high-quality AC power to the load in the off-grid mode, and maintain the stability and reliability of the system in the off-grid mode; specifically, the off-grid output filter 400 may 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 the off-grid mode.

[0053] In some embodiments, each filter unit in the present application is a 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 affects the performance and efficiency of the filter; the power winding is used to transmit the energy of photovoltaic, battery or inverter, and is divided into the left power winding and the right power winding, which are respectively connected to different electrical paths to ensure the stable transmission of energy; the auxiliary winding is used to form a common mode current cancellation system, reduce the magnetic field imbalance inside the magnetic core, and thus suppress the noise source. In the present application, the auxiliary windings of each filter unit are divided into the left auxiliary winding and the right auxiliary winding, and the mutual cancellation of common mode current is achieved through the connection mode of input common inductance connection and output common inductance connection.

[0054] like 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; the ends away from each other are also connected 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; the ends far away from each other are also connected 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] Furthermore, in the input filter unit, 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; in the output filter unit, 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 to form a common-mode current cancellation system, reducing the magnetic field imbalance inside the magnetic core, thereby suppressing the noise source.

[0057] In some embodiments, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 may 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. It is connected between the power line and the ground, and can effectively filter out high-frequency noise to ensure the electromagnetic compatibility of the system. In the present invention, the X capacitor is used to connect the two ends of the photovoltaic input filter 100 and the battery input filter 200, and is grounded to suppress common-mode noise; the Y capacitor is mainly used to suppress differential-mode noise. It is connected between the power lines, and can effectively filter out low-frequency noise to ensure the electromagnetic compatibility of the system. In the present invention, the Y capacitor is used to connect the two ends of the grid output filter 300 and the off-grid output filter 400, and is 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 a power winding and an auxiliary winding arranged on both sides of the magnetic core, a common-mode current cancellation system is formed by introducing an auxiliary winding, which reduces the magnetic field imbalance inside the magnetic core, thereby effectively suppressing common-mode noise. This design enables the filter to maintain a stable filtering effect in multiple operating modes, ensuring that the system complies with EMC safety regulations; further, the auxiliary windings of the first input filter unit 110 and the second input filter unit 210 are interconnected 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 interconnected. This design further enhances the ability to suppress common-mode noise, especially in the application scenario of multi-channel strings, and can effectively reduce interference between the strings.

[0060] In some embodiments, it can be understood that, since the present application optimizes the structural design of the filter unit, especially the layout of the auxiliary winding and the power winding, the filter of the present invention can significantly reduce the use of magnetic devices without affecting energy transmission. Compared with traditional filters, the volume of the filter of the present invention 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 capacitors and Y capacitors, the EMC performance of the filter is further enhanced, and the need for additional magnetic devices is reduced. These capacitors can not only suppress noise, but also improve the stability and safety of the system.

[0061] In some embodiments, it can be understood that since the present application forms an efficient filtering network by connecting 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 at the ends close to each other and at the ends far away from each other, and grounding them through capacitors, this design enables the filter to maintain a consistent filtering effect in different working modes, especially in multi-mode operation such as grid-connected and off-grid, the filtering performance is significantly improved. Specifically, the filter performance of the present invention is at least 30dB higher than that of using a common-mode inductor alone for each string group; in addition, the design of the auxiliary winding makes the residual magnetic of each string group add up to the same, thereby achieving mutual cancellation of common-mode currents and further improving the filtering effect.

[0062] In some embodiments, it can be understood that the combined 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 present invention fully considers the needs of the photovoltaic energy storage integrated machine in various working modes, such as grid-connected, off-grid, backup power supply, etc. Through reasonable connection methods and capacitor configurations, the filter can maintain a stable filtering effect under different working conditions, ensuring that the system can comply with EMC safety regulations under any circumstances, and can be directly set inside the photovoltaic integrated machine to improve the EMC performance of the machine in various working modes, while reducing costs and space occupancy.

[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 both use the same magnetic core material and size to ensure the consistency of the filtering effect under different working modes. The magnetic core material can be selected from ferrite or nanocrystalline materials with high magnetic permeability to improve the magnetic saturation ability and reduce the loss; further, the ends of the first input filter unit 110 and the second input filter unit 210 that are close to each other are grounded through a first capacitor, and the ends that are far away from each other are grounded through a second capacitor. The selection of capacitors can be optimized according to the frequency characteristics of the system to ensure good filtering effects 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 use the same magnetic core material and size to ensure the consistency of the filtering effect in the grid-connected and off-grid modes. The selection of the magnetic core material should take into account its performance in an AC environment, and select materials suitable for high-frequency applications, such as ferrite or nanocrystalline materials with high magnetic permeability; further, the ends of the first output filter unit 310 and the second output filter unit 410 that are close to each other are grounded through a third capacitor, and the ends that are far away from each other are grounded through a fourth capacitor. This connection method enables the two output filter units to work together in the grid-connected and off-grid modes to ensure the electromagnetic compatibility of the system. The selection of capacitors can be optimized according to the frequency characteristics of the system to ensure good filtering effects in the low frequency band.

[0065] In some embodiments, each filter unit is provided with a left power winding and a right power winding for transmitting energy from photovoltaics, batteries or inverters. The layout of the power winding and the auxiliary winding are symmetrical to reduce the magnetic field imbalance inside the magnetic core and achieve mutual cancellation of common-mode currents. The auxiliary winding should be designed to maintain a certain distance from the power winding to avoid the coupling effect between the two 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 a stable filtering effect in different working modes, the filter of the present invention may also include a control system and a detection device to monitor the working status of each string 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 string through sensors, and collect and analyze sensor data through a data acquisition unit to automatically compensate for performance fluctuations caused by temperature changes or other environmental factors; the detection device is used to measure the current of each string, measure the voltage of each string, monitor the temperature inside the filter, and ensure the stability and reliability of the system.

[0067] In some embodiments, the core material of the filter can be selected from nanocrystalline materials or ferrite materials that are resistant to high temperatures or have high magnetic permeability. The outer shell of the filter is made of aluminum alloy material, and a heat sink is added to the outside to enhance the heat dissipation effect.

[0068] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a photovoltaic energy storage integrated machine, including a filter of the photovoltaic energy storage integrated machine as in any one of the embodiments of the first aspect above.

[0069] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A filter for a photovoltaic energy storage integrated machine, characterized in that: include: 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 includes 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 to the second input filter unit of the battery input filter and is grounded; the first output filter unit of the grid output filter is connected to the second output filter unit of the battery input filter and is grounded.

2. The filter of the photovoltaic energy storage integrated machine according to claim 1, characterized in that: The first input filter unit and the second input filter unit are connected at ends close to each other; and the first input filter unit and the second input filter unit are connected at ends far away from each other.

3. The filter of the photovoltaic energy storage integrated machine according to claim 2, characterized in that: The first input filter unit and the second input filter unit are connected at ends close to each other and grounded through a first capacitor; the first input filter unit and the second input filter unit are connected at ends far away from each other and grounded through a second capacitor.

4. The filter of the photovoltaic energy storage integrated machine according to claim 1, characterized in that: The first output filter unit and the second output filter unit are connected at ends close to each other; and the first output filter unit and the second output filter unit are connected at ends far away from each other.

5. The filter of the photovoltaic energy storage integrated machine according to claim 4, characterized in that: The first output filter unit and the second output filter unit are connected at ends close to each other and grounded through a third capacitor; the first output filter unit and the second output filter unit are connected at ends far away from each other and grounded through a fourth capacitor.

6. The filter of the photovoltaic energy storage integrated machine according to claim 2, characterized in that: The first input filter unit includes a first left auxiliary winding and a first right auxiliary winding, the second input filter unit 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.

7. The filter of the photovoltaic energy storage integrated machine according to claim 4, characterized in that: The first output filter unit includes a third left auxiliary winding and a third right auxiliary winding, the second output filter unit 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.

8. The filter of the photovoltaic energy storage integrated 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 each provided with a left power winding and a right power winding.

9. The filter of the photovoltaic energy storage integrated machine according to claim 1, characterized in that: In the first input filter unit, the second input filter unit, the first output filter unit, and the second output filter unit, the layout settings of the auxiliary winding and the power winding are the same.

10. A photovoltaic energy storage integrated machine, characterized in that: A filter comprising a photovoltaic energy storage integrated machine as described in any one of claims 1 to 9.

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