Distributed power supply system

Abstract

The invention provides a distributed power supply system which comprises a split transformer, the split transformer is a three-phase transformer with each phase comprising M low-voltage windings, and any phase of the split transformer has the following connection relation: the M low-voltage windings are arranged in parallel, each low-voltage winding is connected with a first end of a standard transformer, and a second end of the standard transformer is connected with a second end of the standard transformer; the second end of each standard transformer is connected with the first ends of N inverters, the N inverters are arranged in parallel, the second ends of the N inverters are connected to a direct-current power supply, the inverters convert direct-current voltage output by the direct-current power supply into first alternating-current voltage, and the first alternating-current voltage is used for converting the first alternating-current voltage into second alternating-current voltage. The standard transformers convert first alternating-current voltages output by the N inverters into second alternating-current voltages, the second alternating-current voltages are larger than the first alternating-current voltages, the split transformer converts second alternating-current voltages output by the M standard transformers into third alternating-current voltages, and the third alternating-current voltages are larger than the second alternating-current voltages. According to the invention, the electric energy of a plurality of direct-current power supplies can be fused.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a distributed power supply system. Background Art

[0002] The traditional centralized power generation method refers to the method of centrally producing electricity through large-scale power stations, and then transmitting the electricity over long distances to different regions and users through high-voltage transmission lines. However, with the continuous development of science and technology, people's demand for electricity in production and life is getting higher and higher, and the traditional centralized power generation method cannot meet the user's needs. Summary of the invention

[0003] The embodiments of the present application provide a data processing method, device, electronic device, computer-readable storage medium and computer program product for a virtual scene, which can integrate the electric energy of multiple DC power supplies to meet the power needs of users.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides a distributed power supply system, the distributed power supply system comprising: a split transformer, the split transformer being a three-phase transformer including M low-voltage windings per phase, and any phase of the split transformer having the following connection relationship:

[0006] The M low-voltage windings are arranged in parallel, each of the low-voltage windings is connected to the first end of a standard transformer, the second end of each standard transformer is connected to the first end of N inverters, the N inverters are arranged in parallel, and the second ends of the N inverters are connected to a DC power supply, and both M and N are integers greater than or equal to 2; wherein,

[0007] The inverter is used to convert the DC voltage output by the DC power supply into a first AC voltage;

[0008] The standard transformer is used to convert the first AC voltage output by the N inverters into a second AC voltage, where the second AC voltage is greater than the first AC voltage;

[0009] The split transformer is used to convert the second AC voltage output by the M standard transformers into a third AC voltage, and the third AC voltage is greater than the second AC voltage.

[0010] In the above solution, the inverter is a bidirectional inverter;

[0011] The standard transformer is further used to convert the fourth AC voltage output by the split transformer into a fifth AC voltage, wherein the fifth AC voltage is less than the fourth AC voltage;

[0012] The inverter is further used to convert the fifth AC voltage output by the standard transformer into a DC voltage and input it into the DC power supply.

[0013] In the above scheme, the low-voltage winding is in a pancake shape, M is greater than or equal to 4, the M low-voltage windings are divided into two groups, and each group of low-voltage windings is symmetrically arranged in the split transformer.

[0014] In the above scheme, the distributed power supply system also includes high-voltage windings, the number of the high-voltage windings is less than the number of the low-voltage windings, and the distance between the high-voltage windings and the low-voltage windings is positively correlated with the third AC voltage.

[0015] In the above solution, when the N inverters are in working state, the phases of the waveforms of the alternating current corresponding to the first ends of the N inverters are consistent.

[0016] In the above solution, the distributed power supply system also includes a controller;

[0017] The controller is used to perform phase adjustment on the waveforms of the alternating current corresponding to the first ends of the N inverters by sending phase adjustment signals to the N inverters.

[0018] In the above solution, the split transformer is connected to the power grid;

[0019] The split transformer is also used to input the third AC voltage into the power grid.

[0020] In the above solution, the DC power source is an energy storage battery, and the distributed power supply system also includes renewable energy power generation equipment;

[0021] The renewable energy power generation equipment is connected to at least one of the energy storage batteries and is used to convert the renewable energy into electrical energy and store the electrical energy in the energy storage battery.

[0022] In the above solution, the number of the renewable energy power generation equipment is at least two, and different renewable energy power generation equipment corresponds to different renewable energy sources.

[0023] In the above solution, when the plurality of standard transformers in the distributed power supply system are in working state, the currents outputted from the first ends of the plurality of standard transformers are of the same magnitude.

[0024] The embodiments of the present application have the following beneficial effects:

[0025] The distributed power supply system provided in the embodiment of the present application includes a split transformer, which is a three-phase transformer including M low-voltage windings in each phase, and any phase of the split transformer has the following connection relationship: M low-voltage windings are arranged in parallel, each low-voltage winding is connected to the first end of a standard transformer, the second end of each standard transformer is connected to the first end of N inverters, N inverters are arranged in parallel, and the second ends of the N inverters are connected to a DC power supply, M and N are both integers greater than or equal to 2, the inverter is used to convert the DC voltage output by the DC power supply into a first AC voltage, the standard transformer is used to convert the first AC voltage output by the N inverters into a second AC voltage, the second AC voltage is greater than the first AC voltage, and the split transformer is used to convert the second AC voltage output by the M standard transformers into a third AC voltage, and the third AC voltage is greater than the second AC voltage.

[0026] From the above content, it can be known that the distributed power supply system provided in the embodiment of the present application can be used to convert the DC power output by the DC power supply into AC power, and then the electric energy of multiple DC power supplies can be integrated through a standard transformer and a split transformer to increase the voltage, thereby meeting the user's usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 3 ;

[0030] Figure 4 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 4 ;

[0031] Figure 5 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 5 ;

[0032] Figure 6 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 6 ;

[0033] Figure 7 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 7 ;

[0034] Figure 8This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 8 ;

[0035] Fig. 9 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 9 . DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0037] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0038] It is understandable that in the embodiments of the present application, related data such as user information is involved. When the embodiments of the present application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0039] In the following description, the terms "first\second\..." are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\..." can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0041] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0042] 1) Split transformer refers to a multi-winding power transformer consisting of one high-voltage winding and two or more low-voltage windings with the same voltage and capacity in each phase. A power transformer is a device that converts an AC voltage of a certain value into another or several different voltages of the same frequency.

[0043] 2) Inverter is an electronic device that can convert direct current (DC) into alternating current (AC). Inverters are widely used in situations where devices powered by batteries or other DC power sources need to be converted into AC power. For example, in solar power generation systems, DC power generated by solar panels can be converted into AC power for home and commercial use.

[0044] 3) Standard transformer is a transformer used to handle lower voltage levels. A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Among them, the standard transformer can be a low-voltage transformer or a medium-voltage transformer.

[0045] For example, when the standard transformer is a low voltage transformer, the output voltage of the low voltage transformer is less than 1000 V. For another example, when the standard transformer is a medium voltage transformer, the output voltage of the medium voltage transformer is greater than or equal to 1000 V and less than or equal to 20 KV.

[0046] 4) Low voltage winding is the winding with lower voltage in the split transformer.

[0047] 5) High voltage winding is the winding with higher voltage in the split transformer.

[0048] 6) Energy storage battery is a battery that can store electrical energy. It can store energy when electricity is generated and release energy for use when needed.

[0049] 7) Bidirectional inverter, also known as bidirectional converter or bidirectional power converter, is a power electronic device that can realize the bidirectional flow of electric energy. It can not only convert direct current (DC) into alternating current (AC), but also convert alternating current (AC) back to direct current (DC).

[0050] 8) Renewable energy power generation equipment refers to equipment that can convert renewable energy, such as solar energy, wind energy, and hydropower, into electrical energy. These equipment include but are not limited to photovoltaic panels, wind turbines, and hydropower generators.

[0051] The distributed power supply system provided in the embodiment of the present application is described below. Figure 1 , Figure 1 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 1 ,exist Figure 1 In the embodiment, the distributed power supply system includes a split transformer 100, 3 times M standard transformers, 3 times M times N inverters and 3 times M DC power supplies.

[0052] The inverter is used to convert the DC voltage output by the energy storage battery into a first AC voltage, the standard transformer is used to convert the first AC voltage output by N inverters into a second AC voltage, and the second AC voltage is greater than the first AC voltage. The split transformer is used to convert the second AC voltage output by M standard transformers into a third AC voltage, and the third AC voltage is greater than the second AC voltage.

[0053] Through the distributed power supply system provided in the embodiment of the present application, the DC power output by the DC power supply is converted into AC power, and then the electric energy of multiple DC power supplies can be integrated through a standard transformer and a split transformer to increase the voltage, thereby meeting the user's usage needs.

[0054] The structure of the distributed power supply system provided by the embodiment of the present application is first described below. The split transformer 100 is a three-phase transformer. The three-phase transformer can be a three-phase group transformer or a three-phase core transformer, which is reasonable. The split transformer 100 includes a first phase 110, a second phase 120 and a third phase 130. The first phase 110, the second phase 120 and the third phase 130 can be connected in star or in triangle.

[0055] The first phase 110, the second phase 120 and the third phase 130 all have predefined head ends and tail ends. The star connection method is that the tail end of the first phase 110, the tail end of the second phase 120 and the tail end of the third phase 130 are connected, the head end of the first phase 110, the head end of the second phase 120 and the head end of the third phase 130 are led out, and the angle between the first phase 110, the second phase 120 and the third phase 130 is 120 degrees.

[0056] The triangle connection method is that the head end of the first phase 110 is connected to the tail end of the third phase 130, the tail end of the first phase 110 is connected to the head end of the second phase 120, and the tail end of the second phase 120 is connected to the head end of the third phase 130. The specific setting can be made according to actual use requirements.

[0057] Each phase of the split transformer consists of M low voltage windings (in Figure 1 (not shown), that is, the first phase 110, the second phase 120 and the third phase 130 each include M low-voltage windings. Wherein, M is greater than or equal to 4, for example, M can be 8, 10, 12, etc., and can be specifically set according to actual use requirements.

[0058] In some embodiments, in order to ensure the stability of the distributed power supply system, the number of low-voltage windings can be greater than M, that is, the low-voltage windings can be set redundantly. For example, the number of low-voltage windings required by the user is 10. In order to ensure the stability of the distributed power supply system, 12 low-voltage windings can be set. In this way, when some low-voltage windings cannot be used, the distributed power supply system can still be used.

[0059] The following is a specific description with reference to the first phase 110. The first phase 110 includes M low-voltage windings arranged in parallel. The M low-voltage windings are divided into two groups, and each group of low-voltage windings is symmetrically arranged in the split transformer, that is, for each of the first phase 110, the second phase 120 and the third phase 130, the M low-voltage windings are divided into two groups, and each group of low-voltage windings is symmetrically arranged in the phase.

[0060] For example, see Figure 2 , Figure 2 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 2 The first phase 110 includes 8 low-voltage windings arranged in parallel, specifically a low-voltage winding 201, a low-voltage winding 202, a low-voltage winding 203, a low-voltage winding 204, a low-voltage winding 205, a low-voltage winding 206, a low-voltage winding 207 and a low-voltage winding 208.

[0061] exist Figure 2 In the figure, the low voltage winding 201, the low voltage winding 202, the low voltage winding 203 and the low voltage winding 204 are the first group, the low voltage winding 205, the low voltage winding 206, the low voltage winding 207 and the low voltage winding 208 are the second group, and the first group and the second group are symmetrically arranged, specifically, the low voltage winding 201 and the low voltage winding 205 are symmetrically arranged (that is, there is a symmetrical relationship between the low voltage winding 201 and the low voltage winding 205), the low voltage winding 202 and the low voltage winding 206 are symmetrically arranged, the low voltage winding 203 and the low voltage winding 207 are symmetrically arranged, and the low voltage winding 204 and the low voltage winding 208 are symmetrically arranged.

[0062] In other words, the low voltage winding 201, the low voltage winding 202, the low voltage winding 203 and the low voltage winding 204 form one branch, and the low voltage winding 205, the low voltage winding 206, the low voltage winding 207 and the low voltage winding 208 form another branch.

[0063] By setting low-voltage windings in parallel, the short-circuit current can be limited. Specifically, when a short-circuit fault occurs in one branch of the low-voltage winding, the short-circuit current will pass through the semi-through impedance due to the existence of the split impedance. Since the split impedance is large, the short-circuit current is small, which helps to protect the distributed power system from damage.

[0064] By setting low-voltage windings in parallel, the reliability of the distributed power supply system can also be improved. Specifically, in the event of a low-voltage winding failure, the remaining low-voltage windings can still operate, that is, the split transformer can still operate, which can ensure that the distributed power supply system can still operate.

[0065] In order to improve the heat dissipation efficiency, for any two adjacent low-voltage windings in any item that do not have a symmetrical relationship, the distance between the two low-voltage windings can be set to 5 cm to 10 cm according to actual usage requirements. Figure 2 In the embodiment, the distance between the low voltage winding 201 and the low voltage winding 202 is 5 cm.

[0066] In some embodiments, there is leakage inductance between low-voltage windings, and the leakage inductance between low-voltage windings cancels each other, which can eliminate or reduce harmonic circulating currents, wherein leakage inductance refers to the inductance that the magnetic field generated by the current in a low-voltage winding is not fully coupled to other low-voltage windings, but is partially dissipated into the surrounding space, that is, each low-voltage winding will generate a magnetic field of the low-voltage winding, and the magnetic field will not be fully coupled to other low-voltage windings, thereby generating leakage inductance. Harmonic circulating current refers to high-order harmonic currents generated by the presence of nonlinear loads in the power system.

[0067] In some embodiments, the distributed power supply system also includes a high-voltage winding. According to the user's demand for the voltage output by the split transformer (i.e., the third AC voltage), any phase of the split transformer may also include one or more high-voltage windings, wherein the number of high-voltage windings is less than the number of low-voltage windings.

[0068] In some embodiments, the number of high-voltage windings is positively correlated with the third AC voltage. For example, the voltage corresponding to one high-voltage winding is 2.5KV. If the user's demand for the voltage output by the split transformer (i.e., the third AC voltage) is 10KV, then any item of the split transformer can be set to include 4 high-voltage windings.

[0069] In some embodiments, the shapes of the low voltage winding and the high voltage winding may both be layered. In some embodiments, in order to ensure uniform magnetic field distribution, reduce magnetic leakage and improve heat dissipation efficiency, the shapes of the low voltage winding and the high voltage winding may both be pancake-shaped. According to actual use requirements, the low voltage winding or the high voltage winding may be a continuous pancake winding, a tangled pancake winding, a spiral pancake winding, an interlaced pancake winding, etc., which may be specifically set according to actual use requirements.

[0070] In some embodiments, the low voltage winding is located between the magnetic core and the high voltage winding, that is, the low voltage winding is located inside the high voltage winding. In some embodiments, in order to avoid local discharge points, an insulator can be added between the low voltage winding and the high voltage winding.

[0071] In some embodiments, in order to improve heat dissipation efficiency, according to the user's demand for the voltage output by the split transformer (ie, the third AC voltage), the distance between the nearest low-voltage winding and the high-voltage winding belongs to a preset distance interval.

[0072] In some embodiments, the distance between the high-voltage winding and the low-voltage winding is positively correlated with the third AC voltage. For example, if the user's demand for the voltage output by the split transformer (i.e., the third AC voltage) is 10KV, the distance between the nearest low-voltage winding and the high-voltage winding belongs to the first distance interval, and the first distance interval is 5 cm to 10 cm.

[0073] For another example, if the user's demand for the voltage output by the split transformer (ie, the third AC voltage) is 35KV, the distance between the nearest low-voltage winding and the nearest high-voltage winding belongs to the first distance interval, which is 10 cm to 15 cm.

[0074] Arcing is an electric arc that occurs between two charged conductors. When the voltage is high enough, it can ionize the gas (such as air) to form a conductive channel. In order to avoid arcing problems between high-voltage windings, if there are multiple high-voltage windings, multiple high-voltage windings can be arranged in parallel, and the coils corresponding to any two adjacent high-voltage windings have different winding methods.

[0075] For example, the high-voltage winding 1 and the high-voltage winding 2 are adjacent. For the high-voltage winding 1, the coil can be wound on the iron core in a clockwise direction, which is equivalent to the high-voltage winding 1 forming a "positive pancake". For the high-voltage winding 2, the coil can be wound on the iron core in a counterclockwise direction, which is equivalent to the high-voltage winding 2 forming a "reverse pancake".

[0076] In some embodiments, the split transformer can be classified according to the cooling medium and the insulating material. For different types of split transformers, the distance between any two adjacent high-voltage windings may be different. Of course, the distance between any two adjacent high-voltage windings is also related to the user's demand for the voltage output by the split transformer (i.e., the third AC voltage), and can be set specifically in combination with the specific usage scenario.

[0077] For example, in the case where the split transformer is a dry-type transformer, if the user's demand for the voltage output by the split transformer (i.e., the third AC voltage) is 35KV, the distance between any two adjacent high-voltage windings can be any distance between 5 mm and 10 mm. Among them, dry-type transformers do not use oil or other liquids as cooling media, but rely on air or gas (such as nitrogen) for cooling. Their insulation materials are usually insulating paper, glass cloth and other solid insulating materials.

[0078] Each low-voltage winding is connected to the first end of a standard transformer, wherein the voltage of the first end of the standard transformer can be set according to actual use requirements, for example, the voltage of the first end of the standard transformer can be 3300 V. For another example, the voltage of the first end of the standard transformer can be 1140 V. For another example, the voltage of the first end of the standard transformer can be 1000 V.

[0079] Continue to see Figure 1 ,exist Figure 1 In the embodiment, M is greater than 2, and the first phase 110 is connected to M standard transformers, and the standard transformers correspond to the low-voltage windings one by one. The M low-voltage windings can be low-voltage winding 11, low-voltage winding 12, ..., low-voltage winding 1M (in Figure 1 The standard transformer includes a standard transformer 1101 and a standard transformer 1102 (not shown in FIG. Figure 1 The low voltage winding 11 is connected to the first end of the standard transformer 1101, the low voltage winding 12 is connected to the first end of the standard transformer 1102, ..., the low voltage winding 1M is connected to the first end of the standard transformer 110M.

[0080] Similarly, the second phase 120 includes M low-voltage windings arranged in parallel, and the M low-voltage windings can be low-voltage winding 21, low-voltage winding 22, ..., low-voltage winding 2M, and the standard transformer includes standard transformer 1201, standard transformer 1202 ..., standard transformer 120M. Low-voltage winding 21 is connected to the first end of standard transformer 1201, low-voltage winding 22 is connected to the first end of standard transformer 1202, ..., and low-voltage winding 2M is connected to the first end of standard transformer 120M.

[0081] The third phase 130 includes M low-voltage windings arranged in parallel, and the M low-voltage windings may be low-voltage winding 31, low-voltage winding 32, ..., low-voltage winding 3M, and the standard transformer includes standard transformer 1301, standard transformer 1302, ..., standard transformer 130M. The low-voltage winding 31 is connected to the first end of the standard transformer 1301, the low-voltage winding 32 is connected to the first end of the standard transformer 1302, ..., and the low-voltage winding 3M is connected to the first end of the standard transformer 130M (for the second phase 120 and the third phase 130, Figure 1 The low voltage winding, the standard transformer, and the connection relationship between the low voltage winding and the standard transformer are not shown).

[0082] That is, for a split transformer, the number of standard transformers is consistent with that of low-voltage windings, for example, the number of low-voltage windings is 3 times M, and the number of standard transformers is also 3 times M. The second end of each standard transformer is connected to the first end of N inverters, and the N inverters are arranged in parallel, and M and N are both integers greater than or equal to 2.

[0083] In some embodiments, in order to ensure the stability of the distributed power supply system, the number of inverters may be greater than N, that is, the inverters may be set redundantly. For example, the number of inverters required by the user is 10. In order to ensure the stability of the distributed power supply system, 12 inverters may be set. In this way, when some inverters cannot be used, the distributed power supply system can still be used.

[0084] Continue to see Figure 1 ,exist Figure 1 In the example, N is greater than 2, and N can be set according to actual use requirements. For example, N can be 10, 11, 12, etc., and can be set according to actual use requirements. The second end of the standard transformer 1101 is connected to the first end of the N inverters, that is, the second end of the standard transformer 1101 is connected to the first end of the inverter 101, the second end of the standard transformer 1101 is connected to the first end of the inverter 102, ..., the second end of the standard transformer 1101 is connected to the first end of the inverter 10N.

[0085] The second end of the standard transformer 110M is connected to the first ends of N inverters, that is, the second end of the standard transformer 110M is connected to the first end of the inverter M01, the second end of the standard transformer 110M is connected to the first end of the inverter M02, ..., the second end of the standard transformer 110M is connected to the first end of the inverter M0N.

[0086] The second ends of the N inverters are connected to a DC power source, and the number of DC power sources can be greater than or equal to the number of standard transformers. Figure 1 In the figure, for the first phase 110, the number of DC power supplies is M, specifically including DC power supply 1011, DC power supply 1102 (not shown in the figure), ..., DC power supply M011. Inverter 101, inverter 102, ..., inverter 10N are all connected to DC power supply 1011, and inverter M01, inverter M02, ..., inverter M0N are all connected to DC power supply M011.

[0087] In some embodiments, the DC power source may be a storage battery, an AC generator and rectifier, a DC generator, etc., which may be configured according to actual usage requirements. Figure 3 , Figure 3 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 3 , inverter 101, inverter 102, ..., inverter 10N are all connected to the solar cell panel, that is, Figure 1 The DC power supply 1011 shown is a solar panel, and the inverters M01, M02, ..., and M0N are all Figure 1 The DC power supply M011 connection is shown, Figure 1The DC power supply M011 shown is composed of a hydroelectric AC generator and a rectifier.

[0088] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 4 , inverter 101, inverter 102, ..., inverter 10N are all connected to energy storage power supply 401, that is, Figure 1 The DC power supply 1011 shown is the energy storage power supply 401, and the inverters M01, M02, ..., and M0N are all Figure 1 The energy storage power supply 40M connection is shown, Figure 1 The DC power supply M011 shown is the energy storage power supply 40M.

[0089] In some embodiments, in the case where the DC power source is an energy storage power source, the distributed power system further includes a renewable energy power generation device, the number of energy storage batteries is 3 times M, and the renewable energy power generation device is connected to one or more of the 3 times M energy storage batteries, that is, the renewable energy power generation device is connected to at least one energy storage battery. According to actual use requirements, the energy storage battery can be a lithium battery, a sodium battery, etc.

[0090] The number of renewable energy power generation equipment is at least two, that is, the number of renewable energy power generation equipment is greater than or equal to 2, and different renewable energy power generation equipment corresponds to different renewable energy sources. Among them, renewable energy power generation equipment refers to equipment that converts renewable energy into electrical energy, that is, renewable energy can convert renewable energy into electrical energy and store the electrical energy in energy storage batteries. Renewable energy can be wind energy, solar energy, hydropower, geothermal energy, etc., and accordingly, renewable energy power generation equipment can be wind turbines, solar panels, hydropower generators, geothermal generators, etc.

[0091] Each energy storage power source can be connected to multiple renewable energy power generation equipment, and different energy storage power sources can correspond to different renewable energy power generation equipment or the same renewable energy power generation equipment. Figure 5 , Figure 5 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 5 The energy storage power supply 401 can be connected to the wind turbine 501 and the hydroelectric generator 502. The wind turbine 501 can convert wind energy into electrical energy, thereby storing the electrical energy in the energy storage power supply 401. The hydroelectric generator 502 can convert water energy into mechanical energy, thereby converting mechanical energy into electrical energy, and then storing the electrical energy in the energy storage power supply 401.

[0092] The energy storage power supply 40M can be connected to the wind turbine 503 and the hydroelectric generator 504. The wind turbine 503 can convert wind energy into electrical energy, thereby storing the electrical energy in the energy storage power supply 40M. The hydroelectric generator 504 can convert water energy into mechanical energy, thereby converting mechanical energy into electrical energy, and then storing the electrical energy in the energy storage power supply 40M.

[0093] Each energy storage power source can be connected to a renewable energy power generation device, and different energy storage power sources can correspond to different renewable energy power generation devices or the same renewable energy power generation devices. Figure 6 , Figure 6 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 6 The energy storage power supply 401 can be connected to the wind turbine 601, the energy storage power supply 40M can be connected to the solar panel 602, and the solar panel 602 can transmit the generated direct current to the energy storage power supply 40M.

[0094] In some embodiments, the distributed power supply system can be connected to the power grid, that is, the split transformer is connected to the power grid, so that the sharing of electric energy between the distributed power supply system and the power grid can be realized. Specifically, the electric energy in the energy storage battery in the distributed power supply system can be transmitted to the power grid, thereby improving the stability of the power grid.

[0095] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 7 , the split transformer 100 is connected to the power grid 700, that is, the distributed power system can be connected to the power grid, so that the sharing of electric energy between the distributed power system and the power grid can be achieved.

[0096] exist Figure 7 Also shown are standard transformers 1101, 1102, ..., and 113M, wherein standard transformers 1101 to 110M are connected one by one to the M low-voltage windings included in the first phase of the split transformer 100. Standard transformers 110M+1 to 1102M are connected one by one to the M low-voltage windings included in the second phase of the split transformer 100. Standard transformers 1102M+1 to 1103M are connected one by one to the M low-voltage windings included in the third phase of the split transformer 100.

[0097] Accordingly, each of the standard transformers 1101 to 1103M is connected to N inverters. Figure 7 In the embodiment, the second end of the standard transformer 1101 is respectively connected to the first end of the inverter 101, the first end of the inverter 102, ..., and the first end of the inverter 10N.

[0098] The second end of the standard transformer 1102 is respectively connected to the first end of the inverter 201, the first end of the inverter 202, ..., and the first end of the inverter 20N. The second end of the standard transformer 1103M is respectively connected to the first end of the inverter 3M01, the first end of the inverter 3M02, ..., and the first end of the inverter 3M0N.

[0099] The second end of the inverter 101, the second end of the inverter 102, ..., and the second end of the inverter 10N are all connected to the DC power supply 1011. The second end of the inverter 201, the second end of the inverter 202, ..., and the second end of the inverter 20N are all connected to the DC power supply 2011. The second end of the inverter 3M01, the second end of the inverter 3M02, ..., and the second end of the inverter 3M0N are all connected to the DC power supply 3M011.

[0100] In some embodiments, the energy storage battery in the distributed power system can be charged through the power grid. Specifically, the inverter can be a bidirectional inverter, a standard transformer, and is also used to convert the fourth AC voltage output by the split transformer into a fifth AC voltage, and the fifth AC voltage is less than the fourth AC voltage. The inverter is also used to convert the fifth AC voltage output by the standard transformer into a DC voltage, and input it to the energy storage battery. In other words, the energy storage battery in the distributed power system can also be charged through the power grid. It can be seen that the distributed power system provided in the embodiment of the present application can not only transmit the electric energy in the energy storage battery to the power grid, but also charge the energy storage battery through the power grid, which can achieve peak shaving and valley filling.

[0101] In some embodiments, the distributed power system further includes a controller connected to each inverter in the distributed power system. Figure 8 , Figure 8 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 8 The distributed power system further includes a controller 800, which is connected to the inverter 101, the inverter 102, ..., and the inverter 10N. The controller 800 is also connected to the inverter 201, the inverter 202, ..., and the inverter 20N. The controller 800 is also connected to the inverter 3M01, the inverter 3M02, ..., and the inverter 3M0N.

[0102] In some embodiments, for each phase of the split transformer, the controller is used to perform phase adjustment on the waveform of the alternating current corresponding to the first ends of the N inverters by sending a phase adjustment signal to the N inverters.

[0103] That is, the controller is used to phase-regulate the waveform of the AC power corresponding to the first end of the 3 times M times N inverters by sending a phase adjustment signal to the 3 times M times N inverters. The AC power corresponding to the first end of the inverter can be the first AC voltage and the fifth AC voltage.

[0104] In some embodiments, the controller and the inverter may be connected via an optical fiber, which is a medium that uses optical signals to transmit data, and has fast transmission speed, large bandwidth, and strong anti-interference ability. The controller may send a phase adjustment signal, and may first convert the phase adjustment signal (electrical signal) into an optical signal, transmit the optical signal to the inverter via the optical fiber, and then convert the optical signal into an electrical signal, thereby achieving phase adjustment of the waveform of the alternating current corresponding to the first end of the inverter.

[0105] In some embodiments, the controller may send a phase adjustment signal to 3 times M times N inverters simultaneously, thereby adjusting the phases of the AC waveforms corresponding to the first ends of the 3 times M times N inverters to be consistent.

[0106] In some embodiments, for any one of the 3 times M times N inverters, after receiving the phase adjustment signal, the inverter can adjust the waveform of the alternating current corresponding to the first end of each inverter to the phase 0 point, thereby achieving phase alignment of the waveforms of the alternating current corresponding to the first ends of the 3 times M times N inverters, that is, the waveforms of the alternating current corresponding to each first end are consistent. It can be seen that when the 3 times M times N inverters are in working state, the phases of the waveforms of the alternating current corresponding to the first ends of the N inverters are consistent.

[0107] In some embodiments, the waveform of the grid voltage is monitored at preset periodic intervals, and the amplitude, frequency, phase information, etc. of the grid voltage can be obtained through the waveform of the grid voltage, which can be specifically set according to actual usage requirements.

[0108] The waveform of the grid voltage is analyzed to obtain analysis results. When the analysis results indicate that electric energy needs to be transmitted to the grid through the distributed power supply system, the phase of the waveform of the alternating current corresponding to the first ends of the 3 times M times N inverters can be adjusted to be ahead of the phase of the waveform of the grid voltage. In other words, the phase angle of the waveform of the alternating current corresponding to the first ends of the 3 times M times N inverters is ahead of the phase angle of the waveform of the grid voltage. In this way, the electric energy in the energy storage battery in the distributed power supply system can be transmitted to the grid.

[0109] When the analysis results indicate that the energy storage batteries in the distributed power system need to be charged through the power grid, the phase of the waveform of the alternating current corresponding to the first ends of the 3 times M times N inverters can be adjusted to lag behind the phase of the waveform of the grid voltage. In other words, the phase angle of the waveform of the alternating current corresponding to the first ends of the 3 times M times N inverters lags behind the phase angle of the waveform of the grid voltage. In this way, the energy storage batteries in the distributed power system can be charged through the power grid.

[0110] The following describes a method for analyzing the waveform of the grid voltage. In some embodiments, the target voltage can be determined by the waveform of the grid voltage, and then it can be determined whether the target voltage is less than the first preset voltage threshold. When the target voltage is less than the first preset voltage threshold, it indicates that electric energy needs to be delivered to the grid through the distributed power supply system. When the target voltage is greater than the second preset voltage threshold, it indicates that the energy storage battery in the distributed power supply system needs to be charged through the grid. Among them, the second preset voltage threshold is greater than the first preset voltage threshold.

[0111] In some embodiments, the grid frequency can be determined by the waveform of the grid voltage. When the grid frequency is less than the first preset frequency threshold, it indicates that electric energy needs to be transmitted to the grid through the distributed power supply system. The grid frequency refers to the number of times the alternating current in the grid changes periodically per second. When the grid frequency is greater than the second preset frequency threshold, it indicates that the energy storage battery in the distributed power supply system needs to be charged through the grid. The second preset frequency threshold is greater than the first preset frequency threshold. Of course, the timing of the controller for phase adjustment can also be set according to load demand, charge and discharge status of the energy storage battery, etc.

[0112] In some embodiments, the distributed power supply system provided in the embodiments of the present application can also only provide power supply. For example, for mining scenarios, the distributed power supply system provided in the embodiments of the present application can be used for power supply. That is to say, the distributed power supply system provided in the embodiments of the present application can be connected to the power grid (non-islanded) or not connected to the power grid (islanded). That is, the distributed power supply system provided in the embodiments of the present application can be either an island or a non-islanded.

[0113] In some embodiments, when multiple standard transformers in a distributed power supply system are in working state, the current outputted by the first ends of the multiple standard transformers are of the same magnitude. For any item of the split transformer, the distance between the low-voltage winding and the standard transformer may be different. The greater the distance between the low-voltage winding and the standard transformer, the greater the voltage outputted by the standard transformer. That is, the distance between the low-voltage winding and the standard transformer is positively correlated with the voltage outputted by the standard transformer. In actual scenarios, the range of the second AC voltage outputted by the standard transformer may be set according to the distance between the low-voltage winding and the standard transformer.

[0114] In some embodiments, the DC power supply and the second end of the inverter can be connected via a DC bus, and the first end of the inverter and the second end of the standard transformer can be connected via a low-voltage line, where the low-voltage line refers to a power line with a voltage less than or equal to 1KV.

[0115] The first end of the standard transformer can be connected to the low voltage winding of the split transformer through a low voltage line, and the first end of the standard transformer can be connected to the low voltage winding of the split transformer through a high voltage line. The split transformer can be connected to the power grid through a high voltage line, which refers to a power line with a voltage greater than 1KV.

[0116] Combine the following Fig. 9 , the distributed power supply system provided in the embodiment of the present application is illustrated by way of example. Fig. 9 , Fig. 9 This is a schematic diagram of the structure of the distributed power system provided in the embodiment of the present application. Figure 9 ,exist Fig. 9 In the embodiment, the distributed power supply system includes a split transformer 100, 3 times M standard transformers, 3 times M times N inverters and 3 times M DC power supplies.

[0117] The split transformer 100 includes a first phase 110 , a second phase 120 , and a third phase 130 , for each of which only one standard transformer connected to a low voltage winding is shown.

[0118] exist Figure 8 In the figure, only one standard transformer 1101 connected to the low voltage winding is shown for the first phase 110, only one standard transformer 120M connected to the low voltage winding is shown for the second phase 120, and only one standard transformer 130M connected to the low voltage winding is shown for the third phase 130.

[0119] The standard transformer 1101 is connected to the inverters 101 , 102 , … , and 10N. The inverters 101 , 102 , … , and 10N are also connected to the controller 800 . The inverters 101 , 102 , … , and 10N are also connected to the DC power supply 1011 .

[0120] The standard transformer 120M is connected to the inverter 2M01, the inverter 2M02, ..., and the inverter 2M0N. The inverter 2M01, the inverter 2M02, ..., and the inverter 2M0N are also connected to the controller 800. The inverter 2M01, the inverter 2M02, ..., and the inverter 2M0N are also connected to the DC power supply 2M011.

[0121] The standard transformer 130M is connected to the inverter 3M01, the inverter 3M02, ..., and the inverter 3M0N. The inverter 3M01, the inverter 3M02, ..., and the inverter 3M0N are also connected to the controller 800. The inverter 3M01, the inverter 3M02, ..., and the inverter 3M0N are also connected to the DC power supply 3M011.

[0122] The DC voltage range of the output of DC power supply 1011-DC power supply 3M011 can be 400V-650V, the first AC voltage range of the output of inverter 101-inverter 3M0N can be 300V-400V, and the distance between inverter 101-inverter 3M0N and the corresponding standard transformer can be 2 meters to 3 meters.

[0123] The DC power source 1011 is connected to the wind turbine 901 and the hydroelectric generator 902, the DC power source 2M011 is connected to the wind turbine 903 and the hydroelectric generator 904, and the DC power source 3M011 is connected to the wind turbine 905 and the hydroelectric generator 906. The DC power sources 1011 to 3M011 are all energy storage batteries.

[0124] The output voltages of the standard transformers 1101-110M, the standard transformers 1201-120M, and the standard transformers 1301-130M are all greater than 400V and less than 1KV, that is, the second AC voltage is greater than 400V and less than 1KV. The third AC voltage output by the split transformer can be 10KV-40KV, which can be set according to actual use requirements.

[0125] To sum up, the embodiments of the present invention have the following beneficial effects: the distributed power supply system provided by the embodiments of the present application can achieve voltage boosting, and by setting low-voltage windings in parallel, it can protect the distributed power supply system and improve the stability of the distributed power supply system.

[0126] The distributed power supply system provided in the embodiments of the present application can be applied to scenarios with unstable power supply such as mining areas. In some embodiments, the distributed power supply system can be connected to the power grid. In the event of a power grid failure, the distributed power supply system can serve as a power supply system to provide power to the mining area, thereby ensuring that the mining area will not be stagnant due to a power grid failure.

[0127] As mentioned above, in the case where the distributed power supply system is connected to the power grid, the phase of the AC power waveform corresponding to the first end of the inverter can be adjusted so that the electric energy in the energy storage battery can be transmitted to the power grid, or the energy storage battery can be charged through the power grid, thereby achieving peak shaving and valley filling and improving the utilization efficiency of electric energy.

[0128] In some embodiments, the distributed power supply system may not be connected to the power grid. For mining areas with remote locations and long transmission distances, the distributed power supply system can be used as the power supply system for the mining area, which can avoid the risks caused by the disconnection of the transmission line while maintaining the operation of the mining area. It can be seen that the distributed power supply system provided by the embodiment of the present application can determine whether to connect to the power grid according to actual use requirements, thereby achieving different effects. The distributed power supply system provided by the embodiment of the present application has high flexibility and scalability.

[0129] The distributed power supply system provided in the embodiment of the present application can be connected to the power grid and can transmit electric energy to the power grid in combination with renewable energy, thereby enhancing the stability and reliability of the power grid and promoting the use of renewable energy.

[0130] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A distributed power system, It is characterized in that The distributed power supply system comprises: a split transformer, wherein the split transformer is a three-phase transformer including M low-voltage windings in each phase, and any phase of the split transformer has the following connection relationship: The M low-voltage windings are arranged in parallel, each of the low-voltage windings is connected to the first end of a standard transformer, the second end of each standard transformer is connected to the first end of N inverters, the N inverters are arranged in parallel, and the second ends of the N inverters are connected to a DC power supply, and both M and N are integers greater than or equal to 2; wherein, The inverter is used to convert the DC voltage output by the DC power supply into a first AC voltage; The standard transformer is used to convert the first AC voltage output by the N inverters into a second AC voltage, where the second AC voltage is greater than the first AC voltage; The split transformer is used to convert the second AC voltage output by the M standard transformers into a third AC voltage, and the third AC voltage is greater than the second AC voltage.

2. The distributed power supply system according to claim 1, It is characterized in that The inverter is a bidirectional inverter; The standard transformer is further used to convert the fourth AC voltage output by the split transformer into a fifth AC voltage, wherein the fifth AC voltage is less than the fourth AC voltage; The inverter is further used to convert the fifth AC voltage output by the standard transformer into a DC voltage and input it into the DC power supply.

3. The distributed power supply system according to claim 1, It is characterized in that The low-voltage winding is in a pancake shape, M is greater than or equal to 4, the M low-voltage windings are divided into two groups, and each group of low-voltage windings is symmetrically arranged in the split transformer.

4. The distributed power supply system according to claim 1, It is characterized in that The distributed power supply system also includes high-voltage windings, the number of the high-voltage windings is less than the number of the low-voltage windings, and the distance between the high-voltage windings and the low-voltage windings is positively correlated with the third AC voltage.

5. The distributed power supply system according to claim 1, It is characterized in that When the N inverters are in working state, the phases of the waveforms of the alternating currents corresponding to the first ends of the N inverters are consistent.

6. The distributed power supply system according to claim 1, It is characterized in that The distributed power supply system also includes a controller; The controller is used to perform phase adjustment on the waveforms of the alternating current corresponding to the first ends of the N inverters by sending phase adjustment signals to the N inverters.

7. The distributed power supply system according to claim 1, It is characterized in that The split transformer is connected to the power grid; The split transformer is also used to input the third AC voltage into the power grid.

8. The distributed power supply system according to any one of claims 1 to 7, It is characterized in that The DC power source is an energy storage battery, and the distributed power supply system also includes renewable energy power generation equipment; The renewable energy power generation equipment is connected to at least one of the energy storage batteries and is used to convert the renewable energy into electrical energy and store the electrical energy in the energy storage battery.

9. The distributed power supply system according to claim 8, It is characterized in that The number of the renewable energy power generation equipment is at least two, and different renewable energy power generation equipment corresponds to different renewable energy sources.

10. The distributed power supply system according to any one of claims 1 to 7, It is characterized in that When the plurality of standard transformers in the distributed power supply system are in operation, the currents outputted from the first ends of the plurality of standard transformers are of the same magnitude.

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