Electric meter detection method and electric meter detection device for photovoltaic storage and charging station

Abstract

The present invention provides an electric meter detection method and an electric meter detection device for a photovoltaic storage and charging station, the method comprising: obtaining the electric meter value and the output power of the charging pile of the photovoltaic storage and charging station; reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged; obtaining the change value of the output power of each charging pile and the change value of the electric meter detection value; judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value. The present invention triggers the change of the electric meter data by actively adjusting the adjustable load power of the station, and then verifies the change value of the electric meter to judge whether the electric meter has a fault, without other hardware cost investment, low cost and high real-time detection.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to an electric meter detection method and an electric meter detection device of a solar energy storage and charging station. Background Art

[0002] Solar storage and charging stations rely on energy managers and energy management software to achieve economical, safe and stable dispatching and operation. The energy manager needs to monitor the load of the station transformer in real time through the meter at the bottom of the transformer to prevent overload; it also needs to adjust the dispatching strategy through the transformer up / down grid power analysis to achieve optimal economy. Therefore, the accuracy of the meter data at the bottom of the transformer is crucial. If the meter connection is loose, the phase sequence is wrong, and the data is not updated, the system will not immediately find the problem, and use the wrong meter data for control, which brings huge safety risks to the entire system.

[0003] In the related art, in order to avoid the impact of meter failure on the system, a dual meter active-standby solution is usually adopted. However, the dual meter active-standby solution will not only increase the cost, but also increase the complexity of software logic, which will bury hidden dangers for subsequent stable operation. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an electric meter detection method for a solar storage and charging station in a first aspect.

[0005] A second embodiment of the present invention provides an electric meter detection device for a solar storage and charging station.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention proposes an electric meter detection method for a solar storage and charging station, wherein the electric meter is arranged on the user side of the transformer of the solar storage and charging station, and the electric meter is used to detect the total equipment power P of the solar storage and charging station. The method comprises the following steps: obtaining the electric meter value and the output power of the charging pile of the solar storage and charging station; reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged; obtaining the change value of the output power of each charging pile and the change value of the electric meter detection value; judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value.

[0008] According to one embodiment of the present invention, judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value specifically includes: judging whether the change value of the output power of the remaining charging piles Vx is zero; if the change value of the output power of the remaining charging piles Vx is zero, calculating the ratio of the output power change value △P of the charging pile Vi with reduced output power and the change value △M of the electric meter detection value; judging whether the ratio is within a preset range, if the ratio is within the preset range, judging that the electric meter does not have a fault; if the ratio is not within the preset range, judging that the electric meter has a fault.

[0009] According to an embodiment of the present invention, the preset range is [0.8, 1].

[0010] According to one embodiment of the present invention, judging whether the electric meter has a fault is based on the change value of the output power of the charging pile and the change value of the electric meter detection value, and also includes: if the change value of the output power of the remaining charging piles Vx is not zero, then the output power of the charging pile Vi with reduced output power is increased to the output power value before the power is reduced, and then returning to the step of "reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged".

[0011] The second aspect of the present invention proposes an electric meter detection device for a solar storage and charging station, wherein the electric meter is arranged on the user side of the transformer of the solar storage and charging station, and the electric meter is used to detect the total equipment power P of the solar storage and charging station. The device includes: a first acquisition module, wherein the first acquisition module is used to obtain the electric meter value and the output power of the charging pile of the solar storage and charging station; a power regulation module, wherein the power regulation module is used to reduce the output power of one of the working charging piles Vi by a preset value, and keep the output power of the remaining charging piles Vx unchanged; a second acquisition module, wherein the second acquisition module is used to obtain the change value of the output power of each charging pile and the change value of the electric meter detection value; a judgment module, wherein the judgment module is used to judge whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value.

[0012] According to one embodiment of the present invention, the judgment module is specifically used to: judge whether the change value of the output power of the remaining charging piles Vx is zero; if the change value of the output power of the remaining charging piles Vx is zero, calculate the ratio of the output power change value △P of the charging pile Vi with reduced output power and the change value △M of the meter detection value; judge whether the ratio is within a preset range, if the ratio is within the preset range, judge that the meter is not faulty; if the ratio is not within the preset range, judge that the meter is faulty.

[0013] According to an embodiment of the present invention, the preset range is [0.8, 1].

[0014] According to one embodiment of the present invention, the judgment module is also used for: if the change value of the output power of the remaining charging piles Vx is not zero, then after the output power of the charging pile Vi with reduced output power is increased to the output power value before the power reduction, returning to the step of "reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged".

[0015] Beneficial effects of the present invention:

[0016] The present invention triggers the change of meter data by actively adjusting the adjustable load power of the station, and then verifies the meter change value to determine whether the meter has a fault. No other hardware cost investment is required, the cost is low, and the detection real-time performance is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of an electric meter detection method of a solar storage and charging station according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of a photovoltaic storage and charging station according to an embodiment of the present invention;

[0019] Figure 3 is a flow chart of an electric meter detection method of a solar storage and charging station according to another embodiment of the present invention;

[0020] Figure 4 It is a block diagram of an electric meter detection device of a solar storage and charging station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Figure 1 FIG. 1 is a flow chart of a method for detecting an electric meter of a photovoltaic charging and storage station according to an embodiment of the present invention. Figure 2As shown, the photovoltaic storage and charging station includes: a transformer, a charging pile, a photovoltaic device, an energy storage device, and an energy manager, wherein the transformer includes a grid side and a user side, the grid side is connected to the grid, and the user side is connected to the charging pile, the photovoltaic device, and the energy storage device. The electric meter is arranged on the user side of the transformer of the photovoltaic storage and charging station, and the electric meter is used to detect the total equipment power P of the photovoltaic storage and charging station. The energy manager can obtain various working parameters of the photovoltaic storage and charging station, such as the meter value, the output power of each charging pile, the relevant parameters of the photovoltaic device, the relevant parameters of the energy storage device, etc. The specific working process of the photovoltaic storage and charging station is the existing technology and will not be repeated in the present invention.

[0023] like Figure 1 As shown, the meter detection method of the photovoltaic storage and charging station includes the following steps:

[0024] S1, obtain the meter value and the output power of the charging pile of the solar storage charging station.

[0025] The meter value refers to the total power P of the equipment in the solar-storage-charging station detected by the meter. The output power of the charging piles in the solar-storage-charging station refers to the output power corresponding to each charging pile.

[0026] S2, reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged.

[0027] That is to say, select any one of the charging piles that are currently charging, call it charging pile Vi, and reduce the output power of charging pile Vi by a preset value, wherein the preset value can be preset according to the actual situation. The preset value should not be too large to avoid affecting the normal charging of the current charging load, nor should it be too small to avoid the change in the meter detection value being unclear and affecting subsequent judgments. For example, the preset value can be 3-5W.

[0028] S3, obtaining the change value of the output power of each charging pile and the change value of the meter detection value.

[0029] S4, judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value.

[0030] Specifically, the energy manager can be used to obtain the meter value and the output power of the charging piles of the solar storage and charging station, and then slightly reduce the output power of one of the working charging piles Vi, and then read the change value of the output power of each charging pile and the change value of the meter detection value. Finally, it can be determined whether the meter is faulty based on the change value of the output power of the charging pile and the change value of the meter detection value. Therefore, by actively adjusting the adjustable load power of the station to trigger the change of the meter data, and then checking the meter change value to determine whether the meter is faulty, no other hardware cost investment is required, the cost is low, and the detection is highly real-time.

[0031] According to one embodiment of the present invention, Figure 3 As shown, judging whether the meter has a fault according to the change value of the output power of the charging pile and the change value of the meter detection value includes:

[0032] S41, determine whether the change value of the output power of the remaining charging piles Vx is zero. If yes, execute step S42; if not, execute step S46.

[0033] S42, calculating the ratio of the output power change value △P of the charging pile Vi with reduced output power to the change value △M of the meter detection value, that is, △P / △M.

[0034] S43, judging whether the ratio is within a preset range. If yes, executing step S44; otherwise, executing step S45.

[0035] Among them, the preset range can be [0.8, 1].

[0036] S44, determining whether the electric meter has any fault.

[0037] S45, determining whether the electric meter has a fault.

[0038] S46, after increasing the output power of the charging pile Vi with reduced output power to the output power value before the power reduction, return to step S2.

[0039] Specifically, in addition to the power consumption of the equipment, the photovoltaic storage and charging station also has certain losses. If the meter value is M, the loss of the station is k, and the total power of the photovoltaic storage and charging station equipment P = M*(1-k). Usually 0<K<0.2, and when the station load changes very little, it can be considered that k remains unchanged; if the k value is too large, it means that the station loss ratio is too large and needs to be repaired.

[0040] According to P=M*(1-k), it can be seen that the meter value M and the total power P of the solar storage and charging station are approximately linearly related, so the change of P △P will also bring about a proportional change of M △M, that is, △P=△M*(1-k), which is further transformed into: △P / △M=(1-k), with a value range of 0.8≤△P / △M≤1. If the change in the meter value M does not change proportionally when P changes, that is, △P / △M is not between [0.8, 1], it means that the meter is faulty.

[0041] Therefore, the output power of one of the working charging piles Vi can be reduced by a preset value, and the output power of the remaining charging piles Vx can be kept unchanged. In order to avoid the situation where the change in the meter detection value is caused by the change in the load of other charging piles (for example, the load of other charging piles has completed charging or started charging), rather than the failure of the meter itself, after the power is reduced, it is first determined whether the change in the output power of the remaining charging piles Vx is zero. If so, the change in the output power of the charging pile Vi △P is calculated. If the power of the charging pile Vi before the power reduction is PC1, and the power of the charging pile Vi after the power reduction is PC2, then △P=PC1-PC2. At the same time, the change in the meter detection value △M before and after the power reduction is calculated. If the meter detection value before the power reduction is M1, and the meter detection value after the power reduction is M2, then △M=M1-M2. Then determine whether 0.8<△P / △M<1. If so, it is determined that the meter is not faulty, otherwise it is determined that the meter is faulty.

[0042] If the output power change value of the remaining charging piles Vx is not zero after the power reduction, the output power of the charging pile Vi with reduced output power is increased to the output power value before the power reduction, and then the process returns to step S2 to re-perform the meter detection.

[0043] When it is determined that the electric meter has a fault, the relevant alarm device can be controlled to send out a fault alarm message.

[0044] In summary, according to the electric meter detection method of the photovoltaic storage and charging station of the embodiment of the present invention, the electric meter value and the output power of the charging pile of the photovoltaic storage and charging station are obtained, the output power of one of the working charging piles Vi is reduced by a preset value, and the output power of the remaining charging piles Vx is kept unchanged, the change value of the output power of each charging pile and the change value of the electric meter detection value are obtained, and the electric meter is judged whether there is a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value. This method triggers the change of the electric meter data by actively adjusting the adjustable load power of the station, and then verifies the change value of the electric meter to determine whether there is a fault in the electric meter. No other hardware cost investment is required, and the cost is low and the detection is highly real-time.

[0045] Corresponding to the above-mentioned method for detecting an electric meter of a solar energy storage and charging station, the present invention further proposes an electric meter detection device for a solar energy storage and charging station. Since the device embodiment of the present invention corresponds to the above-mentioned method embodiment, the details not disclosed in the device embodiment can be referred to the above-mentioned method embodiment, and will not be described in detail in the present invention.

[0046] Figure 4 is a block diagram of an electric meter detection device of a solar storage and charging station according to an embodiment of the present invention, wherein the electric meter is arranged on the user side of the transformer of the solar storage and charging station, and the electric meter is used to detect the total power P of the equipment of the solar storage and charging station, such as Figure 4As shown, the device includes: a first acquisition module 1, a power adjustment module 2, a second acquisition module 3 and a judgment module 4.

[0047] Among them, the first acquisition module 1 is used to obtain the meter value and the output power of the charging pile of the solar storage and charging station; the power adjustment module 2 is used to reduce the output power of one of the working charging piles Vi by a preset value, and keep the output power of the remaining charging piles Vx unchanged; the second acquisition module 3 is used to obtain the change value of the output power of each charging pile and the change value of the meter detection value; the judgment module 4 is used to judge whether the meter is faulty according to the change value of the output power of the charging pile and the change value of the meter detection value.

[0048] According to one embodiment of the present invention, the judgment module 4 is specifically used to: judge whether the change value of the output power of the remaining charging piles Vx is zero; if the change value of the output power of the remaining charging piles Vx is zero, then calculate the ratio of the output power change value △P of the charging pile Vi with reduced output power and the change value △M of the meter detection value; judge whether the ratio is within a preset range, if the ratio is within the preset range, judge that the meter is not faulty; if the ratio is not within the preset range, judge that the meter is faulty.

[0049] According to one embodiment of the present invention, the preset range is [0.8, 1].

[0050] According to one embodiment of the present invention, the judgment module 4 is also used for: if the change value of the output power of the remaining charging piles Vx is not zero, then after the output power of the charging pile Vi with reduced output power is increased to the output power value before the power is reduced, returning to the step of "reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged".

[0051] In summary, according to the electric meter detection device of the photovoltaic charging station of the embodiment of the present invention, the first acquisition module obtains the electric meter value and the output power of the charging pile of the photovoltaic charging station, the power adjustment module reduces the output power of one of the working charging piles Vi by a preset value, and keeps the output power of the remaining charging piles Vx unchanged, the second acquisition module obtains the change value of the output power of each charging pile and the change value of the electric meter detection value, and the judgment module judges whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value. Therefore, the device triggers the change of the electric meter data by actively adjusting the adjustable load power of the station, and then verifies the change value of the electric meter to determine whether the electric meter has a fault, without the need for other hardware cost investment, low cost, and high real-time detection.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 invention. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting an electric meter in a solar storage and charging station, characterized in that: The electric meter is arranged at the user side of the transformer of the solar energy storage and charging station, and the electric meter is used to detect the total power P of the equipment of the solar energy storage and charging station. The method comprises the following steps: Obtain the meter value and the output power of the charging pile of the solar storage charging station; Reduce the output power of one of the working charging piles Vi by a preset value, and keep the output power of the remaining charging piles Vx unchanged; Obtain the change value of the output power of each charging pile and the change value of the meter detection value; Judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value; wherein, judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value specifically includes: Determine whether the output power change value of the remaining charging piles Vx is zero; If the change value of the output power of the remaining charging piles Vx is zero, then the ratio of the change value △P of the output power of the charging pile Vi with reduced output power to the change value △M of the meter detection value is calculated; It is determined whether the ratio is within a preset range. If the ratio is within the preset range, it is determined that the electric meter is not faulty; if the ratio is not within the preset range, it is determined that the electric meter is faulty.

2. The electric meter detection method of the solar energy storage and charging station according to claim 1 is characterized in that: The preset range is [0.8, 1].

3. The electric meter detection method of the solar storage and charging station according to claim 1 is characterized in that: Judging whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value, further comprising: If the change value of the output power of the remaining charging piles Vx is not zero, then after the output power of the charging pile Vi with reduced output power is increased to the output power value before the power reduction, return to the step of "reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged".

4. An electric meter detection device for a solar storage and charging station, characterized in that: The electric meter is arranged at the user side of the transformer of the solar energy storage and charging station, and the electric meter is used to detect the total power P of the equipment of the solar energy storage and charging station. The device comprises: A first acquisition module, the first acquisition module is used to obtain the meter value and the output power of the charging pile of the solar storage charging station; A power regulation module, which is used to reduce the output power of one of the working charging piles Vi by a preset value and keep the output power of the remaining charging piles Vx unchanged; A second acquisition module, the second acquisition module is used to obtain a change value of the output power of each charging pile and a change value of the meter detection value; A judgment module, which is used to judge whether the electric meter has a fault according to the change value of the output power of the charging pile and the change value of the electric meter detection value; the judgment module is specifically used to: Determine whether the output power change value of the remaining charging piles Vx is zero; If the change value of the output power of the remaining charging piles Vx is zero, then the ratio of the change value △P of the output power of the charging pile Vi with reduced output power to the change value △M of the meter detection value is calculated; It is determined whether the ratio is within a preset range. If the ratio is within the preset range, it is determined that the electric meter is not faulty; if the ratio is not within the preset range, it is determined that the electric meter is faulty.

5. The electric meter detection device of the solar storage and charging station according to claim 4 is characterized in that: The preset range is [0.8, 1].

6. The electric meter detection device of the solar storage and charging station according to claim 4, characterized in that: The judging module is also used for: If the change value of the output power of the remaining charging piles Vx is not zero, then after the output power of the charging pile Vi with reduced output power is increased to the output power value before the power reduction, return to the step of "reducing the output power of one of the working charging piles Vi by a preset value, and keeping the output power of the remaining charging piles Vx unchanged".

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