Control method and device of power supply system and power supply system

Abstract

The invention discloses a control method and device of a power supply system and the power supply system, and belongs to the technical field of power supply. The power supply system comprises power supply equipment and power metering equipment, the power supply equipment is connected with a grid-connected point, the power metering equipment is arranged at the grid-connected point, and the method comprises the following steps: controlling each phase of the power supply equipment to output power under the condition that the grid-connected point is matched with the phase of each phase voltage sampling line wiring of the power metering equipment; acquiring a current sampling power value of the power metering equipment; based on the current sampling power value and the power value of the power output of each phase of the power supply equipment, determining the phase matching condition of the grid-connected point and each phase of current sampling line wiring of the power metering equipment; and under the condition of phase sequence misconnection between the grid-connected point and the current sampling line, based on the phase matching condition of the grid-connected point and the wiring of each phase of current sampling line, adjusting the sampling output information of the power metering equipment. When the phase sequence between the grid-connected point and the current sampling line is misconnected, correct power data can be obtained without manually changing the wire harness.

Description

[0001] Citation of Related Applications

[0002] This application claims priority. The application number of the prior application is: 2024107659210, the application date is: 2024.06.13, and the name is: Control method of power supply system. Technical Field

[0003] The present application relates to the field of power supply technology, and in particular to a control method and device for a power supply system, and a power supply system. Background Art

[0004] When the photovoltaic storage system controls the power of the grid connection point, a power metering device is required to sample the voltage and current at the grid connection point and calculate the power. Incorrect wiring of the current sampling line of the power metering device will cause the power value calculated by the power metering device to be abnormal, resulting in the photovoltaic storage system being unable to accurately control the power of the grid connection point.

[0005] Currently, when a wiring error in a power metering device is detected, the installer is usually prompted to change the wiring of the power metering device twice or more until the wiring is correct. However, the wiring at the grid connection point may be very complicated, and even with the corresponding prompt, the installer may not be able to correctly change the wiring of the power metering device. Summary of the Invention

[0006] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a control method, device, and power supply system for a power supply system, which can obtain correct power data without manually changing the wiring harness when the phase sequence between the grid connection point and the current sampling line is incorrectly connected.

[0007] In a first aspect, the present application provides a control method for a power supply system, the power supply system comprising a power supply device and a power metering device, the power supply device being connected to a grid connection point, and the power metering device being located at the grid connection point, the method comprising:

[0008] When the phases of the grid connection point and the voltage sampling lines of each phase of the power metering device match, controlling each phase of the power supply device to output power and obtaining the current sampled power value of the power metering device;

[0009] Based on the current sampled power value and the power value of each phase of the power supply device, determining the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device;

[0010] In the case where the phase sequence between the grid connection point and the current sampling line is misconnected, the sampling output information of the power metering device is adjusted based on the phase matching between the grid connection point and the current sampling line of each phase.

[0011] According to the control method of the power supply system of the present application, by controlling the power output of each phase of the power supply equipment, the phase matching of the wiring of the grid connection point and the current sampling line of each phase of the power metering equipment can be detected. Based on the phase matching, the output information of the current sampling line of each phase can be automatically adjusted so that the power value calculated by the power metering equipment is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the correct power data can be obtained without the installer manually changing the wiring harness.

[0012] According to one embodiment of the present application, determining the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device based on the current sampled power value and the power value of the power output of each phase of the power supply device includes:

[0013] Determine a ratio between the current sampled power value of each phase and the power value output by the power supply device as a first ratio;

[0014] The phase matching condition is determined based on the magnitude and sign of each corresponding first ratio.

[0015] According to one embodiment of the present application, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0016] When the difference between the absolute value of the first ratio and the first preset ratio is within a first preset difference range, it is determined that the current sampling line of the corresponding phase is misconnected in phase sequence.

[0017] According to one embodiment of the present application, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0018] When the first ratio is a negative value and the difference between the absolute value of the first ratio and the second preset ratio is within a second preset difference range, or when the first ratio is a positive value and the difference between the absolute value of the first ratio and the first preset ratio is within a first preset difference range, it is determined that the current sampling line of the corresponding phase has an access direction reversed.

[0019] According to one embodiment of the present application, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0020] When the difference between the absolute value of the first ratio and the second preset ratio is within a second preset difference range and the first ratio is a positive value, it is determined that the current sampling line of the corresponding phase is correctly connected.

[0021] According to one embodiment of the present application, adjusting the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling line of each phase includes:

[0022] In the event that a three-phase sequence misconnection occurs between the current sampling line and the grid connection point, the current sampling lines of any two phases are controlled to exchange sampling data. In the event that the current sampling lines of any two phases exchange sampling data, each phase of the power supply device is re-controlled to output power, and a new current sampled power value of the power metering device is obtained.

[0023] Determine a new phase matching condition between the grid connection point and the current sampling line connection based on the new current sampled power value and the power value of each phase of the power supply device that is re-output;

[0024] Based on the new phase matching situation, a first phase and a second phase of the power metering device are determined, and sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, where the first phase and the second phase are phases with a wrong phase sequence.

[0025] According to one embodiment of the present application, adjusting the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling line of each phase includes:

[0026] In the case where two phases are misconnected between the current sampling line and the grid connection point, sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, and the first phase and the second phase are the phases with the misconnected phase sequence.

[0027] According to an embodiment of the present application, after determining the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device, the method further includes:

[0028] When the current sampling line is connected in a reverse direction, the current sampled power value of the corresponding phase is negated.

[0029] According to one embodiment of the present application, controlling each phase of the power supply device to output power includes:

[0030] Controlling each phase of the power supply device to output power at least twice;

[0031] The determining, based on the current sampled power value and the power value of each phase of the power supply device output, of the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device includes:

[0032] Based on the power values of at least two power outputs of each phase of the power supply device and the corresponding at least two currently sampled power values, the phase matching between the grid connection point and the current sampling line connection of each phase is determined.

[0033] In a second aspect, the present application provides a control device for a power supply system, the power supply system including a power supply device and a power metering device, the power supply device being connected to a grid connection point, the power metering device being provided at the grid connection point, the device including:

[0034] A first processing module is configured to control each phase of the power supply device to output power and obtain a current sampled power value of the power metering device when the phase of the connection between the grid connection point and the phase voltage sampling line of each phase of the power metering device matches;

[0035] A second processing module is used to determine the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device based on the current sampled power value and the power value of the power output of each phase of the power supply device;

[0036] The third processing module is configured to adjust the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling lines of each phase when the phase sequence between the grid connection point and the current sampling lines is misconnected.

[0037] According to the control device of the power supply system of the present application, by controlling the power output of each phase of the power supply equipment, the phase matching of the wiring of the grid connection point and the current sampling line of each phase of the power metering equipment can be detected. Based on the phase matching, the output information of the current sampling line of each phase can be automatically adjusted so that the power value calculated by the power metering equipment is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the correct power data can be obtained without the installer manually changing the wiring harness.

[0038] In a third aspect, the present application provides a power supply system, comprising:

[0039] A power supply device and a power metering device, wherein the power supply device is connected to a grid connection point and the power metering device is provided at the grid connection point;

[0040] As described in the second aspect above, the control device of the power supply system is connected to the power supply device and the power metering device.

[0041] According to the power supply system of the present application, by controlling the power output of each phase of the power supply equipment, the phase matching of the wiring of the grid connection point and the current sampling line of each phase of the power metering equipment can be detected. Based on the phase matching, the output information of the current sampling line of each phase can be automatically adjusted so that the power value calculated by the power metering equipment is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the correct power data can be obtained without the installer manually changing the wiring harness.

[0042] In a fourth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the control method for the power supply system as described in the first aspect above is implemented.

[0043] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the power supply system as described in the first aspect above.

[0044] In a sixth aspect, the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements the control method of the power supply system as described in the first aspect above.

[0045] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0047] Figure 1 This is one of the flow charts of the control method of the power supply system provided in the embodiment of the present application;

[0048] Figure 2 This is one of the structural diagrams of the power supply system provided in the embodiment of the present application;

[0049] Figure 3 This is a second flow chart of the control method of the power supply system provided in an embodiment of the present application;

[0050] Figure 4 This is the second structural diagram of the power supply system provided in the embodiment of the present application;

[0051] Figure 5 This is the third structural diagram of the power supply system provided in the embodiment of the present application;

[0052] Figure 6This is the fourth structural diagram of the power supply system provided in the embodiment of the present application;

[0053] Figure 7 is a structural diagram of a control device for a power supply system provided in an embodiment of the present application;

[0054] Figure 8 It is a structural diagram of an electronic device provided in an embodiment of the present application.

[0055] Reference numerals:

[0056] Power supply device 210 , power metering device 220 , power grid 310 . DETAILED DESCRIPTION

[0057] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0058] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0059] The following, in combination with the accompanying drawings, describes in detail the control method of the power supply system, the control device of the power supply system, the power supply system, the electronic device and the readable storage medium provided in the embodiments of the present application through specific embodiments and their application scenarios.

[0060] An embodiment of the present application provides a control method for a power supply system. The power supply system includes a power supply device 210 and a power metering device 220. The power supply device 210 is connected to a grid connection point, and the power metering device 220 is located at the grid connection point.

[0061] It should be noted that the power supply device 210 in the embodiment of the present application can be an inverter, a photovoltaic energy storage integrated device, etc., and the power supply device 210 can output AC power to supply a load or a power grid 310.

[0062] The power supply system has input and output power limit requirements at the grid connection point. The power supply system will execute the corresponding scheduling strategy according to the power of the grid connection point. Therefore, a power metering device 220 is often installed at the grid connection point. The power metering device 220 measures the real-time power information between the power supply system and the power grid 310. The point where the power supply device 210 and the power metering device 220 are connected can be regarded as the grid connection point.

[0063] The power metering device 220 may be a device for measuring power, such as an electric meter.

[0064] like Figure 2 As shown, the power metering device 220 includes four voltage sampling lines (L1, L2, L3 and LN) and three current sampling lines (S1, S2 and S3), wherein each current sampling line is connected to a current sensor (Current Transformer, CT). The AC side output ports (A, B, C and N) of the power supply device 210 are directly connected to the power grid 310. The connection lines are marked as LA, LB, LC and LN respectively. The direction of current flowing from the power grid 310 into the power supply device 210 is defined as the positive direction of the CT connection.

[0065] For a three-phase grid-connected system, the access power metering device 220 has three current sensors and three-phase voltage sampling points, which are connected to the power grid 310 through current sampling lines and voltage sampling lines respectively. Due to the complex wiring of the meter, wiring errors often occur. For example, the current sampling line is not connected to the corresponding phase line of the power grid 310 and the current sensor is connected in the reverse direction.

[0066] When the voltage sampling line and current sampling line of the power metering device 220 and the corresponding CT are stably connected to the grid connection point, there is no missing connection, no multiple CTs are connected to the same line of the grid connection point, and no CT is connected to the LN, a wiring error of the power metering device 220 is reflected in the CT connection position or CT connection direction. CT connection position errors and CT connection direction errors can occur simultaneously. Tables 1 and 2 list possible scenarios of CT connection position and CT connection direction, respectively.

[0067] Abnormal wiring conditions will lead to abnormal meter data, making the power supply system's dispatching strategy ineffective, and the grid power cannot be effectively limited, affecting the reliability of the power supply system operation.

[0068] Table 1

[0069]

[0070] Table 2

[0071] S1 corresponds to CT access direction S2 corresponds to CT access direction S3 corresponds to CT access direction Scenario 1 Forward Forward Forward Scenario 2 Reverse Forward Forward Scenario 3 Forward Reverse Forward Scene 4 Forward Forward Reverse Scene 5 Reverse Reverse Forward Scene 6 Reverse Forward Reverse Scene 7 Forward Reverse Reverse Scene 8 Reverse Reverse Reverse

[0072] It should be noted that the scenarios in Table 1 and the scenarios in Table 2 are independent of each other, and there is no corresponding relationship between the scenarios in Table 1 and the scenarios in Table 2.

[0073] For example, scenario 1 in Table 1 may occur simultaneously with any scenario from scenario 1 to scenario 8 in Table 2, and scenario 1 in Table 2 may occur simultaneously with any scenario from scenario 1 to scenario 6 in Table 1.

[0074] To address the problem of detecting the connection between the current sampling line of the power metering device 220 and the power grid 310 (ie, detecting the connection between the current sampling line and the grid connection point), an embodiment of the present application provides a control method for a power supply system.

[0075] like Figure 1 As shown, the control method of the power supply system includes: step 110, step 120 and step 130.

[0076] Step 110 : When the phases of the grid connection point and the voltage sampling lines of each phase of the power metering device 220 match, control each phase of the power supply device 210 to output power and obtain the current sampled power value of the power metering device 220 .

[0077] It should be noted that the connection between the voltage sampling line and the power grid 310 is first detected. When the connection phases between the voltage sampling line and the power grid 310 match, that is, there is no phase sequence error and N line misconnection between the voltage sampling line and the power grid 310, the connection between the current sampling line and the power grid 310 is then detected.

[0078] In this embodiment, when the phase voltage sampling lines of the power metering device 220 match the grid connection phase, the power supply device 210 is controlled to output power, and the current voltage sampling values corresponding to the phase voltage sampling lines of the power metering device 220 and the current current sampling values corresponding to the phase current sampling lines are obtained.

[0079] Based on the current voltage sampling value and the current current sampling value, the current sampling power value corresponding to each power metering device 220 is determined, or the current current sampling value is used as the current sampling power value, that is, the current sampling power value can be a power value or a current value.

[0080] It should be noted that the current sampled power value includes at least one of the current sampled active power value, the current sampled reactive power value, and the current sampled apparent power value.

[0081] Step 120 : Based on the current sampled power value and the power value of each phase of the power supply device 210 , determine the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device 220 .

[0082] In this step, the phase matching between the grid connection point and the current sampling line connection can be determined by comparing the current sampled power value of the power supply device 210 collected by the power metering device 220 and the power value output by the power supply device 210.

[0083] It can be understood that the grid connection point and the current sampling line wiring can be completely matched in each phase, and the grid connection point and the current sampling line wiring can also be connected in the wrong phase sequence. The access direction of the current sampling line can be the correct direction, and the current sampling line can also be connected in the reverse direction. The phase matching situation can indicate whether the current sampling line of each phase is connected to the grid connection point of the matching phase and whether the access direction of the current sampling line is correct.

[0084] In this embodiment, when the internal wiring of the power supply system is incorrect, the power supply system cannot correctly control the power of the grid connection point. The control method of the power supply system of the embodiment of the present application can detect the wiring error between the grid connection point inside the power supply system and the current sampling lines of each phase of the power metering device 220, and use the phases of the grid connection point as a reference to identify the phase matching between the current sampling line and the grid connection point wiring.

[0085] Step 130 : When the phase sequence between the grid connection point and the current sampling line is wrongly connected, the sampling output information of the power metering device 220 is adjusted based on the phase matching between the grid connection point and the current sampling lines of each phase.

[0086] In this embodiment, when the phase sequence between the grid connection point and the current sampling line is misconnected, the power value calculated by the power metering device 220 will be abnormal. The phase matching situation is analyzed to determine the misconnection type of the current sampling line, that is, whether the access direction is reversed or the phase sequence is misconnected. If the phase sequence is misconnected, it is determined whether it is a three-phase misconnection or a two-phase misconnection. The sampling information of the current sampling line of each phase is adjusted according to the misconnection type of the current sampling line, so that the power value calculated by the power metering device 220 is correct, and the sampling output information of the power metering device 220 is adjusted. The sampling output information can be the current information and power information output by the power metering device 220.

[0087] According to the control method of the power supply system provided in the embodiment of the present application, by controlling the power output of each phase of the power supply device 210, the phase matching of the connection point and the connection of the current sampling lines of each phase of the power metering device 220 can be detected. Based on the phase matching, the output information of the current sampling lines of each phase can be automatically adjusted so that the power value calculated by the power metering device 220 is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the correct power data can be obtained without the installer manually changing the wiring harness.

[0088] In some embodiments, based on the current sampled power value and the power value of each phase of the power supply device 210, determining the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device 220 includes:

[0089] Determine a ratio between the current sampled power value of each phase and the power value output by the power supply device 210 as a first ratio;

[0090] The phase matching condition is determined based on the magnitude and sign of each corresponding first ratio.

[0091] Among them, each phase current sampling line corresponds to a first ratio. For example, the current sampling power value of the phase a current sampling line is p1, and the power value of the power output of phase a of the power supply equipment 210 is p2. Dividing p1 by p2 will obtain the first ratio corresponding to the phase a current sampling line.

[0092] In this embodiment, whether the current sampling lines are connected in the wrong phase sequence is determined based on the size of the first ratio, and whether the current sampling lines are connected in the reverse direction is determined based on the positive or negative sign of the first ratio. The size and positive or negative sign of the first ratio of each phase current sampling line are analyzed to determine the phase matching situation.

[0093] In some embodiments, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0094] When the difference between the absolute value of the first ratio and the first preset ratio is within the first preset difference range, it is determined that the current sampling line of the corresponding phase is misconnected in phase sequence.

[0095] The first preset ratio is a preset ratio, which may be 0.5, and the first preset difference range is a preset difference range, which may be set to be between -5% and 5% of the first preset ratio.

[0096] In this embodiment, the absolute value of the first ratio corresponding to the current sampling line is taken, and the difference between the absolute value of the first ratio and the first preset ratio is calculated. If the difference is within the first preset difference range, it indicates that the current sampling line has a phase sequence misconnection, that is, the CT is connected in the wrong position.

[0097] For example, the first preset ratio is 0.5. When the difference between the first ratio and 0.5 is between -5% and 5% of 0.5, it is determined that the corresponding current sampling line is connected to the wrong phase, that is, there is a phase sequence error.

[0098] In some embodiments, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0099] When the first ratio is a negative value and the difference between the absolute value of the first ratio and the second preset ratio is within the second preset difference range, or when the first ratio is a positive value and the difference between the absolute value of the first ratio and the first preset ratio is within the first preset difference range, it is determined that the current sampling line of the corresponding phase has an access direction reversed.

[0100] In this embodiment, for the connection direction of the current sampling line, whether the connection direction of the current sampling line is reversed is determined in different ways according to whether the phase sequence of the current sampling line connection is correct.

[0101] The difference between the absolute value of the first ratio and the second preset ratio is within the second preset difference range, indicating that the phase sequence of the current sampling line is correct. When the power sampling value of the phase of the power metering device 220 and the power value output by the power supply device 210 have opposite signs, so that the first ratio is negative, it means that the current sampling line is connected in the reverse direction. Otherwise, the current sampling line is connected in the forward direction.

[0102] A difference between the absolute value of the first ratio and the first preset ratio within the first preset difference range indicates that the phase sequence of the current sampling line is incorrect. When the power sampling value of the phase of the power metering device 220 and the power value output by the power supply device 210 have the same sign, so that the first ratio is positive, it indicates that the current sampling line is connected in the reverse direction. Otherwise, the current sampling line is connected in the forward direction.

[0103] In some embodiments, determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes:

[0104] When the difference between the absolute value of the first ratio and the second preset ratio is within the second preset difference range and the first ratio is a positive value, it is determined that the current sampling line of the corresponding phase is correctly connected.

[0105] The second preset ratio is a preset ratio, which may be 1; the second preset difference range is a preset difference range, which may be set to be between -5% and 5% of the second preset ratio.

[0106] In this embodiment, a difference between the absolute value of the first ratio and the second preset ratio within the second preset difference range indicates that the corresponding current sampling line is connected to the correct phase, and a positive value of the first ratio indicates that the current sampling line is connected in the correct direction.

[0107] For example, the second preset ratio is 1. When the difference between the first ratio and 1 is between -5% and 5% of 1, it is determined that the corresponding current sampling line is connected to the correct phase, and the first ratio is a positive value, indicating that the current sampling line is connected in the correct direction and the current sampling line is connected correctly.

[0108] When controlling the active power output of the power supply device 210, the influence of the load active power is ignored:

[0109] When the current sampling line is connected to the wrong position (phase sequence is wrongly connected), the first ratio of the active power sampling value of the corresponding phase of the power metering device 220 (current sampling power value) to the active power value of the corresponding phase output by the power supply device 210 is 0.5 or -0.5.

[0110] When the current sampling line is connected in the reverse direction (phase sequence is correct), the first ratio of the active power sampling value of the corresponding phase of the power metering device 220 to the active power value of the corresponding phase output by the power supply device 210 is -1.

[0111] Table 3

[0112]

[0113] Similarly, when the power supply device 210 outputs reactive power, the influence of the load reactive power is ignored:

[0114] When the current sampling line is connected to an incorrect position, the first ratio of the reactive power sampling value (current sampling power value) of the corresponding phase of the power metering device 220 to the reactive power value of the corresponding phase output by the power supply device 210 is 0.5 or -0.5.

[0115] When the current sampling line is connected in the reverse direction, a first ratio of the reactive power sampling value of the corresponding phase of the power metering device 220 to the reactive power value of the corresponding phase output by the power supply device 210 is -1.

[0116] The output power of the power supply device 210 is controlled. The output power may be either active power or reactive power, or both active power and reactive power.

[0117] Control the output power of the power supply equipment 210. The output power mode can be three-phase power output simultaneously, or each phase can be output independently in sequence. For a three-phase three-wire system, the three-phase power is output simultaneously. For a three-phase four-wire system, the three-phase power can be output simultaneously, or each phase can be output independently in sequence.

[0118] The power output of the power supply device 210 is controlled, and the amplitude of the output power of each phase can be the same or different.

[0119] In essence, three-phase simultaneous output and three-phase independent output are achieved by comparing the disturbed power (current) value of the power supply device 210 with the sampled power (current) value of the power metering device 220 to see whether they meet a specific correspondence relationship, thereby identifying the wiring condition of the power metering device 220.

[0120] When the three-phase output powers are not equal, (x, y, z) indicates that the three-phase powers sampled by the power metering device 220 are x, y, and z respectively. At this time, the three-phase power sampling values of the power metering device 220 corresponding to different wiring scenarios can be expressed as Table 3.

[0121] Because the AC-side screen printing of power supply device 210, the voltage sampling of power metering device 220, and the current sampling of power metering device 220 can be connected arbitrarily, when power supply device 210 outputs different powers on each of its three phases, the three-phase power combinations sampled by power metering device 220 correspond to the scenarios shown in Table 2. This power combination is unique when there is no two-fold relationship between the output powers of each phase of power supply device 210. The current wiring condition can be identified by determining the power sampled by each phase of power metering device 220 and the number of phases with the same output power of each phase of power supply device 210.

[0122] The power sampled by each phase of the power metering device 220 is compared with the power output of the three-phase of the power supply device 210. When the absolute value of the power of a certain phase of the power metering device 220 is the same as the absolute value of the output power of a certain phase of the power supply device 210, it is considered that the current sampling line of the power metering device 220 is connected in the correct position. The current wiring condition (phase matching condition) is identified by the number of correct connection positions of the current sampling line of the power metering device 220.

[0123] For the access positions of the current sampling lines: ① The number of correct current sampling line access positions is 0, indicating that the access positions of all current sampling lines of the power metering device 220 are incorrect; ② The number of correct current sampling line access positions is 1, indicating that the access positions of the current sampling lines of the other two phases of the power metering device 220 are incorrect; ③ The number of correct current sampling line access positions is 3, indicating that the access positions of all current sampling lines of the power metering device 220 are correct.

[0124] Regarding the access direction of the current sampling line: Depending on whether the current sampling line is correctly connected, there are different power size correspondences to identify the current wiring situation. ① For a phase with the current sampling line correctly connected, when the power sampling value of the power metering device 220 for that phase and the power value output by the power supply device 210 have opposite signs, it indicates that the current sampling line is connected in the reverse direction; otherwise, the current sampling line is connected in the forward direction. ② For a phase with the current sampling line incorrectly connected, when the power sampling value of the power metering device 220 and the power value output by the power supply device 210 have opposite signs, it indicates that the current sampling line is connected in the forward direction; otherwise, the current sampling line is connected in the reverse direction.

[0125] It is understandable that the current sampling lines of the power metering device 220 may have three-phase phase sequence misconnection and two-phase phase sequence misconnection. The following describes how to adjust the sampling output information of the power metering device 220 based on the phase matching between the grid connection point and the wiring of the current sampling lines of each phase in the two phase sequence misconnection situations.

[0126] Table 4

[0127]

[0128] For simplicity, the three-phase power supply device 210 outputs the same power simultaneously as an example. (x, y, z) represents the first ratios of the three-phase power of the power metering device 220 to the three-phase power output of the power supply device 210, which are x, y, and z, respectively. The first ratios corresponding to different wiring scenarios can be shown as shown in Table 4.

[0129] In some embodiments, adjusting the sampling output information of the power metering device 220 based on the phase matching between the grid connection point and the connection of each phase current sampling line includes:

[0130] In the case where there is a three-phase phase sequence misconnection between the current sampling line and the grid connection point, the current sampling lines of any two phases are controlled to exchange sampling data. In the case where the current sampling lines of any two phases exchange sampling data, the power supply device 210 is re-controlled to output power in each phase, and a new current sampled power value of the power metering device 220 is obtained;

[0131] Based on the new current sampled power value and the power value of each phase of the power supply device 210 that is re-output, determine the new phase matching condition of the grid connection point and the current sampling line connection;

[0132] Based on the new phase matching situation, the first phase and the second phase of the power metering device 220 are determined, and the sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged. The first phase and the second phase are the phases with a wrong phase sequence.

[0133] In this embodiment, in all 48 groups of calculation results in Table 4, when the access position of the current sampling line is scenario 5-scenario 6 and the access direction of the current sampling line is scenario 1-scenario 8, there is a three-phase phase sequence misconnection between the current sampling line and the grid connection point. It can be seen that the corresponding 16 groups of calculation results are not unique, and the specific form of the connection cannot be clearly determined. For such situations, it is necessary to exchange the current sampling line and sampled data so that the access position of the current sampling line is changed from scenario 5-scenario 6 to one of the access position scenarios 1-scenario 4. The power disturbance is re-executed, and the current sampled power value of the power metering device 220 is re-obtained. Based on the new current sampled power value and the power value of each phase of the power supply device 210 that is re-output, the new phase matching situation of the connection between the grid connection point and the current sampling line is determined. The new phase matching situation is one of the access position scenarios 1-scenario 4, that is, the situation of two-phase phase sequence misconnection.

[0134] According to the new phase matching situation, it is determined that there are two phases of the current sampling line of the power metering device 220 with the wrong phase sequence, namely the first phase and the second phase. The sampling data of the current sampling line of the first phase and the sampling data of the current sampling line of the second phase are exchanged. That is, the current sampling line of the first phase outputs the current value collected by the current sampling line of the second phase, and the current sampling line of the second phase outputs the current value collected by the current sampling line of the first phase. The power is calculated based on the exchanged current value and output, thereby adjusting the sampling output information of the power metering device 220.

[0135] In some embodiments, adjusting the sampling output information of the power metering device 220 based on the phase matching between the grid connection point and the connection of each phase current sampling line includes:

[0136] In the case where there is a two-phase phase sequence misconnection between the current sampling line and the grid connection point, sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, and the first phase and the second phase are the phases with the phase sequence misconnection.

[0137] In this embodiment, among all 48 groups of calculation results, when the current sampling line access position is scenario 1-scenario 4 and the current sampling line access direction is scenario 1-scenario 8, the corresponding 32 groups of calculation results are unique. The specific form of the wiring can be clarified through this result. For such situations, only one power disturbance needs to be performed to identify the wiring scenario.

[0138] According to the phase matching situation, it is determined that there are two phases of the current sampling line of the power metering device 220 that are misconnected in phase sequence, namely the first phase and the second phase. The sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, that is, the current sampling line of the first phase outputs the current value collected by the current sampling line of the second phase, and the current sampling line of the second phase outputs the current value collected by the current sampling line of the first phase. The power is calculated based on the exchanged current values and output.

[0139] In some embodiments, after determining the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device 220, the method further includes:

[0140] When the current sampling line is connected in the reverse direction, the current sampling power value of the corresponding phase is negated.

[0141] In this embodiment, when the current sampling line is connected in the wrong direction, the reading of the power metering device 220 is corrected by taking the opposite number of the current sampled power value of the corresponding phase to ensure that it accurately reflects the actual power flow situation.

[0142] In actual testing, the output power of power supply device 210 is the sum of the AC load power and the sampled power of power metering device 220. When the AC load is large, the output power of power supply device 210 and the sampled power of power metering device 220 differ significantly, and it may be impossible to identify the wiring condition of power metering device 220 through power combination. Therefore, it is necessary to eliminate the influence of load power on the test results. In addition, sampling error in power metering device 220 may lead to misidentification of the wiring scenario. To reduce the error caused by this external factor, the perturbation method of power supply device 210 can be further improved.

[0143] In some embodiments, controlling each phase of the power supply device 210 to output power includes:

[0144] Controlling each phase of the power supply device 210 to output power at least twice;

[0145] Based on the current sampled power value and the power value of each phase of the power supply device 210, the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device 220 is determined, including:

[0146] Based on the power values of at least two power outputs of each phase of the power supply device 210 and the corresponding at least two currently sampled power values, the phase matching between the grid connection point and the connection of the current sampling lines of each phase is determined.

[0147] In this embodiment, each power output performed by the power supply device 210 corresponds to a power value.

[0148] The power supply device 210 performs power output at least twice and compares the power values corresponding to each power output to determine whether the obtained power value is reliable. If the power value is reliable, the phase matching situation can be determined based on the power value and the corresponding current sampled power value.

[0149] In this embodiment, each phase of the power supply device 210 may be controlled to output power twice, and the two power outputs correspond to an output power difference.

[0150] Accordingly, the power metering device 220 performs power sampling twice on each phase to obtain two current sampled power values, and the two current sampled power values correspond to a sampled power difference value.

[0151] In this embodiment, the phase matching condition may be determined according to the magnitude and sign of the ratio between the sampled power difference and the output power difference.

[0152] Power supply device 210 can perturb the power twice at different frequencies, using the difference between the two power perturbations to replace the single perturbation power, thereby reducing steady-state errors, including sampling error and load power. Furthermore, the two power perturbations (power output) can be performed with positive and negative power, respectively. The difference between the two power perturbations is greater than the power value of a single perturbation. This approach can improve detection accuracy without increasing the power perturbation value.

[0153] Some power metering devices 220 support calibration of the current sampling line access position and direction. The power metering device 220 exposes a calibration interface, receives external instructions and then performs corresponding actions to achieve the effect of calibrating the current sampling line access position and direction.

[0154] After the power supply device 210 performs power disturbance, it obtains the sampled power value of the power metering device 220, compares the sampled power value with the output power of the power supply device 210 to identify the current wiring scenario, and the power supply device 210 calls the calibration interface thrown by the power metering device 220 to issue a calibration instruction to the power metering device 220. After the power metering device 220 completes the calibration, the detection process ends.

[0155] A specific embodiment of a control method for a power supply system is introduced below.

[0156] like Figure 3 As shown, step 1: controlling the power supply device 210 to output power.

[0157] Step 2: Compare the current sampled power value of the power metering device 220 with the power value of each phase of the power supply device 210.

[0158] Step 3: The power supply device 210 determines the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device 220 based on the comparison result.

[0159] Step 4: When it is determined that the connection of each phase current sampling line is correct according to the phase matching condition, the detection ends; otherwise, the power supply device 210 sends a calibration instruction to the power metering device 220 .

[0160] Another specific embodiment of a control method for a power supply system is described below.

[0161] The phase sequence of the two current sampling lines is wrong, and the connection direction of the current sampling lines is reversed (the output power is the same). For example, the connection positions of CT1 and CT2 of the power metering device 220 are wrong, and the connection direction of CT3 is reversed. Figure 4 shown.

[0162] Among them, CT1 is a current sensor connected to the current sampling line S1, CT2 is a current sensor connected to the current sampling line S2, and CT3 is a current sensor connected to the current sampling line S3.

[0163] The control process is as follows:

[0164] (1) Control the power supply equipment 210 to output the same reactive power Q in three phases at the same time ref .

[0165] (2) The power metering device 220 samples the three-phase reactive power, which are Q1, Q2 and Q3 respectively. The reactive power sampling Q of the power metering device 220 is X (x=1, 2, 3) is calculated by the current sampled by SX (X=1, 2, 3) and the voltage sampled by LX.

[0166] (3) The relationship between the three-phase reactive power sampled by the power metering device 220 and the reactive power output by the power supply device 210 is:

[0167]

[0168] (4) It can be identified that the wiring mode of the power metering device 220 is as follows: the connection direction of CT3 is reversed, and the connection positions of CT1 and CT2 are wrong.

[0169] (5) Power supply device 210 identifies the current wiring configuration of power metering device 220 and sends a CT adjustment command to power metering device 220: swap the connection positions of CT1 and CT2; and reverse the connection direction of CT3. After receiving the adjustment command, power metering device 220 swaps the sampled data of CT1 and CT2 and reverses the sampled data of CT3, completing the detection.

[0170] Another specific embodiment of a control method for a power supply system is described below.

[0171] The phase sequence of all current sampling lines of the power metering device 220 is wrongly connected, and the connection direction of the current sampling lines is reversed (the output power is the same).

[0172] For example, the connection position of CT1, CT2 and CT3 of the power metering device 220 is wrong, and the connection direction of CT2 is reversed. Figure 5 shown.

[0173] Control processing:

[0174] (1) Control the power supply equipment 210 to output the same reactive power Q in three phases at the same time ref1 ,

[0175] (2) The three-phase reactive power sampled by the power metering device 220 is Q 1-1 , Q 2-1 and Q 3-1 .

[0176] (3) The relationship between the three-phase reactive power sampled by the power metering device 220 and the reactive power output by the power supply device 210 is:

[0177]

[0178] The following wiring methods can be identified: CT1, CT2, and CT3 are all connected in the wrong positions. There are two scenarios in which CT1, CT2, and CT3 are connected in the wrong positions. The current specific wiring scenario cannot be accurately identified.

[0179] The power supply device 210 sends a CT adjustment instruction to the power metering device 220 to exchange any two of the three CTs, for example, CT1 and CT2.

[0180] After receiving the CT access position adjustment instruction, the power metering device 220 internally exchanges the sampled data of CT1 and CT2. Figure 6 shown.

[0181] (1) Control the power supply device 210 to output reactive power Q again ref2 ,

[0182] (2) Similarly, the power metering device 220 samples the three-phase reactive power, which are Q 1-2 , Q 2-2 and Q 3-2 .

[0183] (3) The relationship between the three-phase reactive power sampled by the power metering device 220 and the reactive power output by the power supply device 210 is:

[0184]

[0185] The external wiring method can be obtained as follows: the connection direction of CT2 is reversed, and the connection positions of CT1 and CT3 are incorrect.

[0186] Power supply device 210 identifies the current connection status of power metering device 220 and sends a CT adjustment command to power metering device 220: swap the connection positions of CT1 and CT3 and reverse the connection direction of CT2. After receiving the adjustment command, power metering device 220 swaps the sampled data of CT1 and CT3 and reverses the sampled data of CT2, completing the test.

[0187] Another specific embodiment of a control method for a power supply system is described below.

[0188] All current sampling lines are connected in the wrong phase sequence, and the current sampling line connection direction is reversed (output power is different), such as Figure 5 shown.

[0189] Control processing:

[0190] (1) Control the power supply equipment 210 to output reactive power Q of different magnitudes simultaneously in three phases refa1 , Q refb1 and Q refc1 .

[0191] (2) The three-phase reactive powers sampled by the power metering device 220 are Q 1-1 , Q 2-1 and Q 3-1 .

[0192] (3) The magnitude relationship between the three-phase reactive power sampled by the power metering device 220 and the reactive power output by the power supply device 210 can be expressed as:

[0193]

[0194] (1) The number of phases with the same power between the power sampled by the power metering device 220 and the output power of each phase of the power supply device 210 is 0, indicating that the three CT access positions of the power metering device 220 are all wrong.

[0195] (2) The power supply device 210 sends a CT adjustment instruction to the power metering device 220 to exchange any two of the three CTs, for example, CT1 and CT2.

[0196] (3) Control the power supply equipment 210 to output reactive power Q of different magnitudes simultaneously in three phases refa2 , Q refb2 and Q refc2 .

[0197] (4) The power metering device 220 samples the three-phase reactive power, which are Q 1-2 , Q 2-2 and Q 3-2 .

[0198] The relationship between the three-phase reactive power sampled by the power metering device 220 and the reactive power output by the power supply device 210 is:

[0199]

[0200] (5) The external wiring method can be obtained as follows: the connection direction of CT2 is reversed, and the connection positions of CT1 and CT3 are wrong.

[0201] Power supply device 210 identifies the current connection status of power metering device 220 and sends a CT adjustment command to power metering device 220: swap the connection positions of CT1 and CT3 and reverse the connection direction of CT2. After receiving the adjustment command, power metering device 220 swaps the sampled data of CT1 and CT3 and reverses the sampled data of CT2, completing the test.

[0202] Another specific embodiment of a control method for a power supply system is described below.

[0203] The disturbance of the power supply device 210 is detected twice each time, thereby increasing the detection accuracy.

[0204] In order to reduce the error problem caused by external factors, the disturbance process can be further optimized to control the solar energy storage system to initiate two power disturbances.

[0205] Control process:

[0206] (1) The reactive power of the three-phase output of the first power supply device 210 is Q A1 , Q B1 and Q C1 .

[0207] (2) The three-phase reactive powers sampled by the power metering device 220 are Q 11 , Q 21 and Q 31 .

[0208] (3) The reactive power of the three-phase output of the solar storage system is controlled again as Q A2 , Q B2 and Q C2 .

[0209] (4) The three-phase reactive powers sampled by the power metering device 220 are Q 12 , Q 22 and Q 32 .

[0210] (5) The difference between the two power disturbances of the power supply device 210 is ΔQ A , ΔQ B and ΔQ C , the three-phase reactive power differences sampled by the power metering device 220 are ΔQ1, ΔQ2 and ΔQ3 respectively. Their magnitude relationship can be expressed as

[0211]

[0212] (1) Taking the difference between the two power disturbances for comparison, the magnitude relationship between the three-phase reactive power difference sampled by the power metering device 220 and the reactive power difference output by the solar energy storage system can be expressed as:

[0213]

[0214] The two perturbations do not change the magnitude relationship between the detection data, and therefore do not affect the recognition of the wiring scene.

[0215] In related technologies, the wiring status of power metering device 220 is identified by detecting power disturbances or current changes. If a wiring error occurs, the installer is prompted to reconnect the power metering device 220 twice or more until the connection is correct. Power metering device 220 is often connected to the grid, and on-site wiring can be complex or messy. Even with appropriate prompts, installers may not be able to correctly change the wiring of power metering device 220.

[0216] The power supply system control method provided in the embodiments of the present application uses power disturbances to obtain the current sampled power value of the power metering device 220 at the corresponding moment in time within the power supply device 210. This sampled power value is then used to determine the phase matching of the power metering device 220. Based on the phase matching of the power metering device 220, the power metering device 220 is controlled to exchange the corresponding current sampling data. This allows the power supply device 210 to correctly control the power of the grid connection point without requiring the installer to manually modify the wiring harness.

[0217] It should be noted that the power metering device 220 can be controlled manually, or the power supply device 210 can control the power metering device 220 through an interface exposed by the power metering device 220, etc.; there can be many forms of exchanging the sampled data of the power metering device 220, depending on the internal implementation form of the power metering device 220 manufacturer, including but not limited to the power metering chip of the power metering device 220 exchanging analog-to-digital (AD) sampling channels, and the power metering chip exchanges sampling data by controlling the sampling channel sequence of the external chip select chip.

[0218] The control method of the power supply system provided in the embodiment of the present application can be executed by a control device of the power supply system. In the embodiment of the present application, the control device of the power supply system provided in the embodiment of the present application is described by taking the control device of the power supply system executing the control method of the power supply system as an example.

[0219] An embodiment of the present application also provides a control device for a power supply system.

[0220] like Figure 7 As shown, the control device of the power supply system includes:

[0221] The first processing module 710 is configured to control the power output of each phase of the power supply device 210 when the phase of the connection between the grid connection point and the phase voltage sampling line of each phase of the power metering device 220 matches, and obtain the current sampled power value of the power metering device 220;

[0222] The second processing module 720 is used to determine the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device 220 based on the current sampled power value and the power value of the power output of each phase of the power supply device 210;

[0223] The third processing module 730 is configured to adjust the sampling output information of the power metering device 220 based on the phase matching between the grid connection point and the current sampling lines of each phase when the phase sequence between the grid connection point and the current sampling lines is misconnected.

[0224] According to the control device of the power supply system provided in the embodiment of the present application, by controlling the power output of each phase of the power supply device 210, the phase matching of the connection point and the current sampling line of each phase of the power metering device 220 can be detected. Based on the phase matching, the output information of the current sampling line of each phase can be automatically adjusted so that the power value calculated by the power metering device 220 is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the installer does not need to manually change the wiring harness to obtain correct power data.

[0225] In some embodiments, the second processing module 720 is configured to determine a ratio between a current sampled power value of each phase and a power value output by the power supply device 210 as a first ratio;

[0226] The phase matching condition is determined based on the magnitude and sign of each corresponding first ratio.

[0227] In some embodiments, the second processing module 720 is configured to determine that a phase sequence misconnection exists in the current sampling line of the corresponding phase when the difference between the absolute value of the first ratio and the first preset ratio is within a first preset difference range.

[0228] In some embodiments, the second processing module 720 is used to determine that the current sampling line of the corresponding phase has a reverse access direction when the first ratio is negative and the difference between the absolute value of the first ratio and the second preset ratio is within the second preset difference range, or when the first ratio is positive and the difference between the absolute value of the first ratio and the first preset ratio is within the first preset difference range.

[0229] In some embodiments, the second processing module 720 is configured to determine that the current sampling line of the corresponding phase is correctly connected when the difference between the absolute value of the first ratio and the second preset ratio is within a second preset difference range and the first ratio is positive.

[0230] In some embodiments, the third processing module 730 is configured to control the current sampling lines of any two phases to exchange sampling data when there is a three-phase phase sequence misconnection between the current sampling line and the grid connection point, and to re-control the power output of each phase of the power supply device 210 when the current sampling lines of any two phases exchange sampling data, and obtain a new current sampled power value of the power metering device 220;

[0231] Based on the new current sampled power value and the power value of each phase of the power supply device 210 that is re-output, determine the new phase matching condition of the grid connection point and the current sampling line connection;

[0232] Based on the new phase matching situation, the first phase and the second phase of the power metering device 220 are determined, and the current sampled power values of the first phase and the second phase are exchanged. The first phase and the second phase are the phases with a wrong phase sequence.

[0233] In some embodiments, the third processing module 730 is used to exchange sampling data of the current sampling line of the first phase and the current sampling line of the second phase when there is a two-phase phase sequence misconnection between the current sampling line and the grid connection point, and the first phase and the second phase are the phases with a phase sequence misconnection.

[0234] In some embodiments, the third processing module 730 is configured to negate the current sampled power value of the corresponding phase when the current sampling line is connected in a reverse direction.

[0235] In some embodiments, the first processing module 710 is configured to control each phase of the power supply device 210 to output power at least twice;

[0236] Based on the current sampled power value and the power value of each phase of the power supply device 210, the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device 220 is determined, including:

[0237] Based on the power values of at least two power outputs of each phase of the power supply device 210 and the corresponding at least two currently sampled power values, the phase matching between the grid connection point and the connection of the current sampling lines of each phase is determined.

[0238] The control device of the power supply system in the embodiment of the present application can be an electronic device or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices other than a terminal.

[0239] The control device of the power supply system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0240] The control device of the power supply system provided in the embodiment of the present application can achieve Figure 1 and Figure 3 To avoid repetition, the various processes implemented in the method embodiment are not described here.

[0241] An embodiment of the present application also provides a power supply system.

[0242] like Figure 2 As shown, the power supply system includes a power supply device 210 and a power metering device 220 . The power supply device 210 is connected to the grid connection point, and the power metering device 220 is located at the grid connection point.

[0243] The power supply system further includes the aforementioned control device of the power supply system, which is connected to the power supply device 210 and the power metering device 220 .

[0244] According to the power supply system provided in the embodiment of the present application, by controlling the power output of each phase of the power supply device 210, the phase matching of the connection point and the current sampling line of each phase of the power metering device 220 can be detected. Based on the phase matching, the output information of the current sampling line of each phase can be automatically adjusted so that the power value calculated by the power metering device 220 is correct. When the phase sequence between the grid connection point and the current sampling line is misconnected, the installer does not need to manually change the wiring harness to obtain correct power data.

[0245] In some embodiments, as Figure 8 As shown, an embodiment of the present application also provides an electronic device 800, including a processor 801, a memory 802, and a computer program stored in the memory 802 and executable on the processor 801. When the program is executed by the processor 801, each process of the control method embodiment of the above-mentioned power supply system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0246] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0247] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned power supply system control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0248] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0249] An embodiment of the present application further provides a computer program product, including a computer program, which implements the control method of the power supply system when executed by a processor.

[0250] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0251] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned power supply system control method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0252] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0253] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0254] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal (which can be a computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0255] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0256] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0257] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a power supply system, characterized in that: The power supply system includes a power supply device and a power metering device, the power supply device is connected to a grid connection point, and the power metering device is provided at the grid connection point. The method includes: When the phases of the grid connection point and the voltage sampling lines of each phase of the power metering device match, controlling each phase of the power supply device to output power and obtaining the current sampled power value of the power metering device; Based on the current sampled power value and the power value of each phase of the power supply device, determining the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device; In the case where the phase sequence between the grid connection point and the current sampling line is misconnected, the sampling output information of the power metering device is adjusted based on the phase matching between the grid connection point and the current sampling line of each phase.

2. The control method of the power supply system according to claim 1, characterized in that: The determining, based on the current sampled power value and the power value of each phase of the power supply device output, of the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device includes: Determine a ratio between the current sampled power value of each phase and the power value output by the power supply device as a first ratio; The phase matching condition is determined based on the magnitude and sign of each corresponding first ratio.

3. The control method of the power supply system according to claim 2, characterized in that: The determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes: When the difference between the absolute value of the first ratio and the first preset ratio is within a first preset difference range, it is determined that the current sampling line of the corresponding phase is misconnected in phase sequence.

4. The control method of the power supply system according to claim 2, characterized in that: The determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes: When the first ratio is a negative value and the difference between the absolute value of the first ratio and the second preset ratio is within a second preset difference range, or when the first ratio is a positive value and the difference between the absolute value of the first ratio and the first preset ratio is within a first preset difference range, it is determined that the current sampling line of the corresponding phase has an access direction reversed.

5. The control method of the power supply system according to claim 2, characterized in that: The determining the phase matching condition based on the magnitude and sign of each corresponding first ratio includes: When the difference between the absolute value of the first ratio and the second preset ratio is within a second preset difference range and the first ratio is a positive value, it is determined that the current sampling line of the corresponding phase is correctly connected.

6. The control method for a power supply system according to any one of claims 1 to 5, characterized in that: The adjusting the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling line of each phase includes: In the event that a three-phase sequence misconnection occurs between the current sampling line and the grid connection point, the current sampling lines of any two phases are controlled to exchange sampling data. In the event that the current sampling lines of any two phases exchange sampling data, each phase of the power supply device is re-controlled to output power, and a new current sampled power value of the power metering device is obtained. Determining a new phase matching condition between the grid connection point and the current sampling line connection based on the new current sampled power value and the power value of each phase of the power supply device that is re-output; Based on the new phase matching situation, a first phase and a second phase of the power metering device are determined, and sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, where the first phase and the second phase are phases with a wrong phase sequence.

7. The control method for a power supply system according to any one of claims 1 to 5, characterized in that: The adjusting the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling line of each phase includes: In the case where two phases are misconnected between the current sampling line and the grid connection point, sampling data of the current sampling line of the first phase and the current sampling line of the second phase are exchanged, and the first phase and the second phase are the phases with the misconnected phase sequence.

8. The power supply system control method according to any one of claims 1 to 5, characterized in that: After determining the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device, the method further includes: When the current sampling line is connected in a reverse direction, the current sampled power value of the corresponding phase is negated.

9. The control method for a power supply system according to any one of claims 1 to 5, characterized in that: The controlling each phase of the power supply device to output power includes: Controlling each phase of the power supply device to output power at least twice; The determining, based on the current sampled power value and the power value of each phase of the power supply device output, of the phase matching between the grid connection point and the current sampling line connection of each phase of the power metering device includes: Based on the power values of at least two power outputs of each phase of the power supply device and the corresponding at least two currently sampled power values, the phase matching between the grid connection point and the current sampling line connection of each phase is determined.

10. A control device for a power supply system, characterized in that: The power supply system includes a power supply device and a power metering device, wherein the power supply device is connected to a grid connection point and the power metering device is provided at the grid connection point. The device includes: A first processing module is configured to control each phase of the power supply device to output power and obtain a current sampled power value of the power metering device when the phase of the connection between the grid connection point and the phase voltage sampling line of each phase of the power metering device matches; A second processing module is used to determine the phase matching between the grid connection point and the current sampling lines of each phase of the power metering device based on the current sampled power value and the power value of the power output of each phase of the power supply device; The third processing module is configured to adjust the sampling output information of the power metering device based on the phase matching between the grid connection point and the current sampling lines of each phase when the phase sequence between the grid connection point and the current sampling lines is misconnected.

11. A power supply system, characterized in that: include: A power supply device and a power metering device, wherein the power supply device is connected to a grid connection point and the power metering device is provided at the grid connection point; The control device of the power supply system according to claim 10, wherein the control device is connected to the power supply device and the power metering device.

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