CN218158141U - Energy storage system common mode interference detection device and system - Google Patents
Energy storage system common mode interference detection device and system Download PDFInfo
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- CN218158141U CN218158141U CN202123369424.XU CN202123369424U CN218158141U CN 218158141 U CN218158141 U CN 218158141U CN 202123369424 U CN202123369424 U CN 202123369424U CN 218158141 U CN218158141 U CN 218158141U
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Abstract
The application discloses energy storage system common mode interference detection device and system, the device includes: the device comprises a sampling comparison module, a display module and a common-mode reference point module; a first input end of the sampling comparison module is connected with an output end of the common mode reference point module, and a second input end of the sampling comparison module is connected with a test input end to be detected; the sampling comparison module is used for sampling the test input end to be detected, the output end of the sampling comparison module is connected with the display module, and the display module is used for displaying the common-mode interference amount of the test input end. The energy storage system common-mode interference detection device can continuously and stably detect the common-mode interference amount on each point to be detected in the energy storage system and report the common-mode interference amount to a user, and used devices are conventional devices, so that the cost is saved.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an energy storage system common-mode interference detection device and system.
Background
In an energy storage system, BMS/EMS/variable current and other integration levels are high, off-grid working modes are frequently switched, common-mode voltage generates instantaneous conversion or is thoroughly changed, and due to the fact that the energy storage system is high in differential mode interference resistance and poor in common-mode resistance, communication among units is affected, abnormal shutdown and data loss are caused, and great threats are caused to stable operation of system unit equipment. And the common mode voltage is measured only by using an oscilloscope or a multimeter as a reference for investigating the fault.
Therefore, the conventional energy storage equipment has no common-mode detection, is subjected to common-mode interference data loss and abnormal shutdown to cause equipment loss, is used for problem investigation and analysis only by personal judgment, and has large measurement error by using an oscilloscope and a universal meter, so that the following problems exist: the oscilloscope is inconvenient to test, difficult to continuously track for a long time and greatly influenced by manual operation. The multimeter test can only display low-frequency signals, and cannot identify high-frequency signals. The test needs to be carried out in operation, and the personal safety is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application is proposed to provide an energy storage system common mode interference detection apparatus.
According to an aspect of the present application, there is provided an apparatus for detecting common mode interference of an energy storage system, the apparatus including: the device comprises a sampling comparison module, a display module and a common-mode reference point module;
the output end of the common mode reference point module is used for providing a stable voltage output end, and the input end of the common mode reference point module is connected with two ends of the storage battery;
the first input end of the sampling comparison module is connected with the output end of the common-mode reference point module, and the second input end of the sampling comparison module is connected with the test input end to be detected; the sampling comparison module is used for sampling the test input end to be detected, the output end of the sampling comparison module is connected with the display module, and the display module is used for displaying the common-mode interference amount of the test input end.
Optionally, the common mode reference point module includes: the circuit comprises a first resistor, a first switch, a first capacitor, a second resistor, a second switch and a second capacitor;
the first resistor, the first capacitor, the second resistor and the second capacitor are sequentially connected in series, the first switch is connected with the first resistor in parallel, and the second switch is connected with the second resistor in parallel;
the other end of the first resistor is connected with the anode of the storage battery, and the other end of the second resistor is connected with the cathode of the storage battery;
and an output end of the common mode reference point module is arranged between the second capacitor and the second capacitor.
Optionally, a third resistor is arranged between the test input end to be detected and the second input end of the sampling comparison module, and the third resistor is connected in parallel with the third switch.
Optionally, the sampling comparison module includes: the circuit comprises a transformer, a third capacitor, a fourth capacitor, a fifth resistor, an operational amplifier and a controller;
the primary winding end of the transformer is connected with the third capacitor in parallel, and the secondary winding end of the transformer is connected with the fourth capacitor in parallel;
one end of the third capacitor is connected in series with the third resistor, and the other end of the third capacitor is connected with the output end of the common mode reference point module;
the fourth capacitor is connected with the fifth resistor in parallel, and two ends of the fourth capacitor are respectively connected with the homodromous input end and the reverse input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
Optionally, the sampling comparison module includes: the circuit comprises a third capacitor, a fourth capacitor, a fifth resistor, a sixth resistor, an operational amplifier and a controller;
one end of the fifth resistor is connected with one end of the third capacitor, and the other end of the fifth resistor is connected with one end of the fourth capacitor; one end of the sixth resistor is connected with the other end of the third capacitor, and the other end of the sixth resistor is connected with the other end of the fourth capacitor;
one end of the third capacitor is connected in series with the third resistor, and the other end of the third capacitor is connected with the output end of the common mode reference point module;
the fourth capacitor is connected with the fourth resistor in parallel, and two ends of the fourth capacitor are respectively connected with the equidirectional input end and the reverse input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
Optionally, an input end of the common mode reference point module is connected to an output end of a storage battery of the energy storage system.
Optionally, the controller is in a DSP, ARM, FPGA or MCU structure.
According to an aspect of the present application, there is provided an energy storage system common mode interference detection system, which includes the common mode interference detection apparatus as described in any one of the above.
Therefore, in the technical solution of the present application, a device for detecting common mode interference of an energy storage system is disclosed, which includes: the device comprises a sampling comparison module, a display module and a common-mode reference point module; the output end of the common mode reference point module is used for providing a stable voltage output end, and the input end of the common mode reference point module is connected with the output end of the storage battery; a first input end of the sampling comparison module is connected with an output end of the common-mode reference point module, and a second input end of the sampling comparison module is connected with a test input end to be detected; and the output end of the sampling comparison module is connected with the display module. The device comprises a common-mode reference point module, a voltage output terminal, a voltage sampling module and a voltage output terminal, wherein the common-mode reference point module is used for providing a stable voltage output terminal so as to establish a stable sampling reference point; the other end of the sampling comparison module is connected with any position needing sampling in the energy storage system, so that the common-mode signal at any position in the energy storage system can be stably acquired; thirdly, devices used in the technical scheme of the application are all conventional devices, so that the cost is saved.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram illustrating an apparatus for detecting common mode interference of an energy storage system according to an embodiment of the present application;
FIG. 2 illustrates a schematic circuit diagram of an apparatus for detecting common mode interference in an energy storage system according to an embodiment of the present application;
fig. 3 shows a schematic circuit diagram of an apparatus for detecting common mode interference of an energy storage system according to another embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the energy storage system, the integration level of BMS/EMS/variable current and the like is high, the off-grid working mode is frequently switched, and the common-mode voltage generates instantaneous conversion or is thoroughly changed. And the battery has strong filtering capability to differential mode and poor resistance to common mode. However, the general power supply device does not have the function of common mode detection and judgment, and cannot perform early warning on common mode interference. The sudden or continuous common mode interference has great harm to equipment, and most common is communication interference, data loss and abnormal shutdown, and the reason of the communication interference and the data loss and the abnormal shutdown cannot be judged. When a fault occurs and needs to be investigated, the measurement of the common-mode voltage can only be carried out by using an oscilloscope and a multimeter for testing as reference. And the common mode voltage can only be measured by using an oscilloscope and a multimeter test as a reference when the common mode voltage is required to be investigated for faults.
The existing energy storage equipment has no common-mode detection, is subjected to common-mode interference data loss and abnormal shutdown to cause equipment loss, is only judged by individuals for problem investigation and analysis, and has large measurement error by using an oscilloscope and a universal meter, and the following problems exist:
(1) It is difficult to find a suitable common mode reference point, which is uncertain and results in test data being unreliable.
(2) The oscilloscope is inconvenient to test, difficult to continuously track for a long time and greatly influenced by manual operation.
(3) The multimeter test can only display low-frequency signals, and cannot identify high-frequency signals.
(4) The test needs to be carried out in operation, and the personal safety is difficult to guarantee.
In order to solve the above problem, the present application provides a common mode interference detection apparatus, including: the device comprises a sampling comparison module, a display module and a common-mode reference point module; the output end of the common mode reference point module is used for providing a stable voltage output end, and the input end of the common mode reference point module is connected with two ends of the storage battery; a first input end of the sampling comparison module is connected with an output end of the common mode reference point module, and a second input end of the sampling comparison module is connected with a test input end to be detected; and the output end of the sampling comparison module is connected with the display module. A stable voltage output end is provided by the common mode reference point module, so that a stable sampling reference point is established. The other end of the sampling comparison module is connected with any position needing sampling in the energy storage system, so that the common-mode signal at any position in the energy storage system can be stably collected. Moreover, devices used in the technical scheme of the application are all conventional devices, so that the cost is saved.
Fig. 1 is a schematic structural diagram illustrating an apparatus for detecting common mode interference of an energy storage system according to an embodiment of the present application; as shown in fig. 1, the common-mode interference detection device is used for stably acquiring common-mode signals at any position in an energy storage system, and solves the problems that in the prior art, testing through an oscilloscope is difficult to continue for a long time, and life safety of acquiring personnel cannot be guaranteed. The common mode interference detection apparatus 100 includes: a sample comparison module 120, a display module 130, and a common mode reference point module 110.
The output end of the common mode reference point module 110 is used for providing a stable voltage output end, and the input end of the common mode reference point module 110 is connected with two ends of the storage battery.
A first input end of the sampling comparison module 120 is connected with an output end of the common-mode reference point module 110, and a second input end of the sampling comparison module 120 is connected with a test input end to be detected; the sampling comparison module 120 is configured to sample the test input terminal to be detected. The output of the sample comparison module 120 is connected to the display module 130. The display module 130 is used for displaying the common mode interference amount of the test input terminal.
In the embodiment of the present application, the common mode reference point module 110 can provide a stable common mode interference reference point, so that the sampling comparison module 120 can accurately collect a common mode signal of the test input end to be detected, thereby continuously outputting a value of the common mode interference of the test input end to be detected in real time, implementing accurate measurement of the common mode voltage in the energy storage system, and facilitating a user to eliminate the generated common mode voltage interference based on the measurement quantity. Moreover, devices used in the technical scheme of the application are all conventional devices, so that the cost is saved. Moreover, the technical scheme of the application has the advantages of low cost, convenience in popularization and application and improvement of market competitiveness of products.
Fig. 2 shows a schematic circuit diagram of an apparatus for detecting common mode interference of an energy storage system according to an embodiment of the present application. As shown in figure 2 of the drawings, in which,
the common mode reference point module 101 includes: a first resistor R1, a first switch RY1, a first capacitor C1, a second resistor R2, a second switch RY2 and a second capacitor C2; the first resistor R1, the first capacitor C1, the second resistor R2 and the second capacitor C2 are sequentially connected in series, the first switch RY1 is connected with the first resistor R1 in parallel, and the second switch RY2 is connected with the second resistor R2 in parallel; the other end of the first resistor R1 is connected with the anode of the storage battery, and the other end of the second resistor R2 is connected with the cathode of the storage battery; and an output end of the common mode reference point module is arranged between the first capacitor and the second capacitor C2.
In one embodiment of the present application, in order to create stable common-mode reference sampling points, the accuracy of common-mode interference detection is improved. A first capacitor C1 and a second capacitor C2 are connected in series at the positive end and the negative end of the storage battery, and a protection resistor, namely a first resistor R1 and a second resistor R2, is respectively connected at the two ends of the first capacitor C1 and the second capacitor C2. In the using process, the first capacitor C1 and the second capacitor C2 are pre-charged through the first resistor R1 and the second resistor R2, so that the voltages at two ends of the first capacitor C1 and the second capacitor C2 are kept stable. Then, by closing the first switch RY1 and the second switch RY2, the first capacitor C1 and the second capacitor C2 are directly connected to two ends of the storage battery, and the voltage at two ends of the storage battery is more stable than the external alternating current, which is at the connection point between the first capacitor C1 and the second capacitor C in the storage battery series circuit, and is also stable, i.e. can be connected to one end of the third capacitor C3 in the sampling comparison module as a stable reference point.
In an embodiment of the present application, a third resistor R3 is disposed between the test input terminal to be tested and the second input terminal of the sampling comparison module, and the third resistor R3 is connected in parallel with the third switch RY3. Similarly, in order to accurately measure the amount of the common-mode interference voltage at the test input end, a third resistor R3 is further connected in series on one side of the third capacitor C3 connected to the test input end to protect the third capacitor C3, during use, the third switch RY3 is opened, the third capacitor C3 is charged through the third resistor R3, and after the voltage of the third capacitor C3 is stabilized, the third switch RY3 is closed. This enables the measurement of the amount of common mode interference voltage at the test input.
In one embodiment of the present application, the sampling comparison module includes: the circuit comprises a transformer, a third capacitor C3, a fourth capacitor C4, a fifth resistor R5, an operational amplifier and a controller; the primary winding end of the transformer is connected with the third capacitor C3 in parallel, and the secondary winding end of the transformer is connected with the fourth capacitor C4 in parallel; one end of the third capacitor C3 is connected in series with the third resistor R3, and the other end of the third capacitor C3 is connected to the output end of the common mode reference point module; the fourth capacitor C4 is connected in parallel with the fifth resistor R5, and two ends of the fourth capacitor C4 are respectively connected with the homodromous input end and the inverting input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
In an embodiment of the present application, a value of the third capacitor C3 may be selected according to actual requirements, for example, when the common mode interference voltage signal to be tested is a high frequency signal, i.e., the frequency range thereof is in a range of 1K to 10K, the third capacitor C3 may be selected to be 0.01 μ f. For example, when the common mode interference voltage signal to be tested is a low frequency signal, i.e. the frequency range is 1-1K, the third capacitor C3 may be selected to be 0.1 μ f.
In addition, in order to ensure the normal operation of the device, the operating voltages of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are greater than the system voltage of the energy storage system.
Fig. 3 shows a schematic circuit diagram of an apparatus for detecting common mode interference of an energy storage system according to another embodiment of the present application. As shown with reference to figure 3 of the drawings,
the sampling comparison module comprises: a third capacitor C3, a fourth capacitor C4, a fifth resistor R5, a sixth resistor R6, an operational amplifier and a controller; one end of the fifth resistor R5 is connected with one end of the third capacitor C3, and the other end is connected with one end of the fourth capacitor C4; one end of the sixth resistor R6 is connected with the other end of the third capacitor C3, and the other end of the sixth resistor R is connected with the other end of the fourth capacitor C4;
one end of the third capacitor C3 is connected in series with the third resistor R3, and the other end of the third capacitor C3 is connected to the output end of the common mode reference point module;
the fourth capacitor C4 is connected in parallel with the fourth resistor R4, and two ends of the fourth capacitor C4 are respectively connected with the unidirectional input end and the reverse input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
As can be seen from the circuit diagrams of the sampling comparison module shown in fig. 2 and fig. 3, in fig. 2, the sampling comparison module adopts a voltage sampling mode, that is, the voltage change at the two ends of the third capacitor C3 is output to the controller through the operational amplifier by the transformer, and the controller performs calculation to obtain a specific value of the common mode interference at the test input end. In fig. 3, the sampling module adopts a resistance sampling mode, that is, sampling is realized by the fifth resistor R5 and the sixth resistor R6 with extremely high resistance values. In other embodiments of the present application, a voltage hall sampling mode and the like may also be adopted, which is not described herein again.
In one embodiment of the present application, the input end of the common mode reference point module is connected to two ends of a storage battery in the energy storage system. The advantage that sets up like this lies in, the inside battery of energy storage system can provide stable voltage, and wireless extra preparation battery reduces unnecessary electron device, and the volume is littleer, and the cost is lower, can arrange inside energy storage system for a long time. And because the circuit is simplified, the replacement is convenient, the test requirements of different test frequency bands can be met, and the size of the third capacitor C3 can be adjusted according to the size of the frequency band to be tested, so that the test precision of the common mode interference is improved.
In one embodiment of the present application, the controller may be: a digital Signal processor (DSP digital Signal Processing), an ARM processor, a Field Programmable Gate Array (FPGA), or a Micro Control Unit (MCU). That is to say, in the present application, in the sampling comparison circuit, after the common mode interference at the two ends of the third capacitor C3 is collected, the common mode interference is processed by the DSP, the ARM, the FPGA, or the MCU, and then a corresponding numerical value or frequency is output. The type of the controller can be selected according to actual requirements. Further, the controller outputs the processed numerical value to the display module 130 after the processing. And subsequently, setting a threshold value according to the actual situation, and sending a corresponding alarm when the threshold value is exceeded. Therefore, stable detection of common-mode interference in the energy storage system is realized.
The application also discloses an energy storage system common mode interference detection system, which comprises the common mode interference detection device. And in order to realize automation, a storage unit and a communication unit can be added. And storing the common-mode interference quantity acquired by the common-mode interference detection device, and reporting the common-mode interference quantity through the communication unit. Avoids manual judgment and test, and is simple and convenient to operate.
To sum up, in the embodiment of the present application, because the common mode reference point module 110 can provide a stable common mode interference reference point, the sampling comparison module 120 can accurately collect the common mode signal of the test input end to be detected, so as to continuously output the value of the common mode interference of the test input end to be detected in real time, thereby implementing accurate measurement on the common mode voltage in the energy storage system, and facilitating a user to eliminate the generated common mode voltage interference based on the measurement quantity. Moreover, devices used in the technical scheme of the application are all conventional devices, so that the cost is saved. Moreover, the technical scheme of the application has the advantages of low cost, convenience in popularization and application and improvement of market competitiveness of products.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Claims (8)
1. An energy storage system common mode interference detection device, characterized in that, the device includes: the device comprises a sampling comparison module, a display module and a common-mode reference point module;
the output end of the common mode reference point module is used for providing a stable voltage output end, and the input end of the common mode reference point module is connected with two ends of the storage battery;
a first input end of the sampling comparison module is connected with an output end of the common mode reference point module, and a second input end of the sampling comparison module is connected with a test input end to be detected; the sampling comparison module is used for sampling the test input end to be detected, the output end of the sampling comparison module is connected with the display module, and the display module is used for displaying the common-mode interference amount of the test input end.
2. The apparatus of claim 1,
the common mode reference point module comprises: the circuit comprises a first resistor, a first switch, a first capacitor, a second resistor, a second switch and a second capacitor;
the first resistor, the first capacitor, the second resistor and the second capacitor are sequentially connected in series, the first switch is connected with the first resistor in parallel, and the second switch is connected with the second resistor in parallel;
the other end of the first resistor is connected with the anode of the storage battery, and the other end of the second resistor is connected with the cathode of the storage battery;
and an output end of the common mode reference point module is arranged between the first capacitor and the second capacitor.
3. The apparatus of claim 1,
and a third resistor is arranged between the test input end to be detected and the second input end of the sampling comparison module, and the third resistor is connected with a third switch in parallel.
4. The apparatus of claim 3,
the sampling comparison module comprises: the circuit comprises a transformer, a third capacitor, a fourth resistor, an operational amplifier and a controller;
the primary winding end of the transformer is connected with the third capacitor in parallel, and the secondary winding end of the transformer is connected with the fourth capacitor in parallel;
one end of the third capacitor is connected in series with the third resistor, and the other end of the third capacitor is connected with the output end of the common mode reference point module;
the fourth capacitor is connected with the fourth resistor in parallel, and two ends of the fourth capacitor are respectively connected with the homodromous input end and the reverse input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
5. The apparatus of claim 3,
the sampling comparison module comprises: the circuit comprises a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, an operational amplifier and a controller;
one end of the fifth resistor is connected with one end of the third capacitor, and the other end of the fifth resistor is connected with one end of the fourth capacitor; one end of the sixth resistor is connected with the other end of the third capacitor, and the other end of the sixth resistor is connected with the other end of the fourth capacitor;
one end of the third capacitor is connected in series with the third resistor, and the other end of the third capacitor is connected with the output end of the common mode reference point module;
the fourth capacitor is connected with the fourth resistor in parallel, and two ends of the fourth capacitor are respectively connected with the homodromous input end and the reverse input end of the operational amplifier; the output end of the operational amplifier is connected with the input end of the controller, and the input end of the controller is connected with the input end of the display module.
6. The apparatus of claim 1,
and the input end of the common-mode reference point module is connected with the output end of a storage battery of the energy storage system.
7. The apparatus according to claim 4 or 5,
the controller is in a DSP, ARM, FPGA or MCU structure.
8. An energy storage system common mode interference detection system, characterized in that the system comprises the energy storage system common mode interference detection device according to any one of the claims 1-7.
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| CN202123369424.XU CN218158141U (en) | 2021-12-28 | 2021-12-28 | Energy storage system common mode interference detection device and system |
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