Trusted calibration method and system for charge and discharge load monitoring terminal

Abstract

The present disclosure provides a trusted calibration method and system for a charge-discharge load monitoring terminal, including: setting an electric energy verification device to a first parameter to calibrate the meter constant of the charge-discharge load monitoring terminal; setting the electric energy verification device to a second parameter to calibrate the power gain of the charge-discharge load monitoring terminal; enlarging the meter constant of the electric energy verification device by a specified multiple and reducing the calibration value of the meter constant register of the charge-discharge load monitoring terminal by a specified multiple, setting the electric energy verification device to a third parameter to calibrate the phase gain of the charge-discharge load monitoring terminal; setting the electric energy verification device to a fourth parameter to calibrate the voltage and current gain of the charge-discharge load monitoring terminal. Among them, the influence of the stability of the standard source power supply on the calibration accuracy is reduced; since the meter constant of the electric energy verification device is enlarged by a specified multiple and the calibration value of the meter constant register of the charge-discharge load monitoring terminal is reduced by a specified multiple, the pulse output is accelerated and the calibration speed is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power systems, and in particular to a trusted calibration method and system for a charging and discharging load monitoring terminal. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the disclosure that are recited in the claims. No description herein is admitted to be prior art by inclusion in this section.

[0003] The charging and discharging load monitoring terminal is a low-voltage distribution network intelligent terminal. It is an intelligent collection and control terminal for charging and discharging facilities. It meets the needs of high-performance concurrency, large-capacity storage, multiple collection objects, on-site analysis and decision-making, and collaborative computing. It has functions such as data collection, equipment operation status monitoring, and electricity metering, supporting the development needs of charging and discharging facilities and emerging businesses.

[0004] The calibration of charging and discharging load monitoring terminals, such as intelligent fusion terminals, energy controllers, and smart energy units, requires the use of a three-phase standard source, which is connected to the terminal through an Ethernet port and manually calibrated using the power method. However, due to the accuracy and stability of the three-phase standard source, not only is the calibration accuracy low, but the manual operation is also time-consuming and laborious. Summary of the invention

[0005] In view of this, the purpose of the present disclosure is to propose a trusted calibration method and system for a charge and discharge load monitoring terminal, which at least solves one of the technical problems in the related art to a certain extent.

[0006] Based on the above purpose, the first aspect of the exemplary embodiment of the present disclosure provides a trusted calibration method for a charging and discharging load monitoring terminal, including:

[0007] Connect the electric energy verification device to the charge and discharge load monitoring terminal to be calibrated;

[0008] The electric energy verification device is set to a first parameter, the charge and discharge load monitoring terminal is verified by the electric energy verification device set to the first parameter to obtain a first electric energy error, the first electric energy error is sent to the charge and discharge load monitoring terminal, and the electric meter constant of the charge and discharge load monitoring terminal is calibrated based on the first electric energy error;

[0009] The electric energy verification device is set to a second parameter, the charge and discharge load monitoring terminal that has completed the meter constant calibration is verified by the electric energy verification device set to the second parameter to obtain a second electric energy error, the second electric energy error is sent to the charge and discharge load monitoring terminal, and the power gain calibration of the charge and discharge load monitoring terminal is performed based on the second electric energy error;

[0010] The meter constant of the electric energy verification device is enlarged by a specified multiple and set as a third parameter, the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by the specified multiple, the charge and discharge load monitoring terminal that has completed the power gain calibration and the calibration value of the meter constant register is reduced by the specified multiple is verified by the electric energy verification device whose meter constant is enlarged by the specified multiple and set as the third parameter to obtain a third electric energy error, the third electric energy error is sent to the charge and discharge load monitoring terminal, and the phase gain calibration is performed on the charge and discharge load monitoring terminal based on the third electric energy error;

[0011] The electric energy verification device is set to the fourth parameter, and the charge and discharge load monitoring terminal that has completed the phase gain calibration is verified by the electric energy verification device set to the fourth parameter, so that the charge and discharge load monitoring terminal obtains voltage and current detection values, and the voltage and current standard values ​​are sent to the charge and discharge load monitoring terminal, and voltage and current error values ​​are obtained based on the voltage and current detection values ​​and the voltage and current standard values, and voltage and current gain calibration is performed on the charge and discharge load monitoring terminal based on the voltage and current error values.

[0012] Based on the same inventive concept, a second aspect of the exemplary embodiment of the present disclosure provides a trusted calibration system for a charge-discharge load monitoring terminal, comprising: an electric energy verification device and a charge-discharge load monitoring terminal to be calibrated;

[0013] The electric energy verification device is installed with matching calibration software, which is used to generate corresponding calibration instructions according to the calibration items of the charge and discharge load monitoring terminal using the matching calibration software;

[0014] The charging and discharging load monitoring terminal communicates with the electric energy testing device, is used to receive the test environment and calibration signal output by the electric energy testing device, and performs the corresponding calibration items. After the calibration is completed, the calibration result is stored in the iron electric.

[0015] From the above, it can be seen that the trusted calibration method and system for the charge and discharge load monitoring terminal provided by the embodiment of the present disclosure includes: setting the electric energy verification device to the first parameter to calibrate the meter constant of the charge and discharge load monitoring terminal; setting the electric energy verification device to the second parameter to calibrate the power gain of the charge and discharge load monitoring terminal; enlarging the meter constant of the electric energy verification device by a specified multiple and reducing the calibration value of the meter constant register of the charge and discharge load monitoring terminal by a specified multiple, setting the electric energy verification device to the third parameter to calibrate the phase gain of the charge and discharge load monitoring terminal; setting the electric energy verification device to the fourth parameter to calibrate the voltage and current gain of the charge and discharge load monitoring terminal. Among them, the influence of the stability of the standard source power supply on the calibration accuracy is reduced, and the calibration accuracy is improved; and, since the meter constant of the electric energy verification device is enlarged by a specified multiple and the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by a specified multiple, the pulse output is accelerated, the error verification time is shortened, and the calibration speed is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of an application scenario of a trusted calibration system for a charge and discharge load monitoring terminal provided by an exemplary embodiment of the present disclosure;

[0018] Figure 2 A flow chart of a trusted calibration method for a charge and discharge load monitoring terminal provided by an exemplary embodiment of the present disclosure;

[0019] Figure 3 A schematic flow chart of a method for calibrating an electric meter constant provided by an exemplary embodiment of the present disclosure;

[0020] Figure 4 A schematic flow chart of a power gain calibration method provided for an exemplary embodiment of the present disclosure;

[0021] Figure 5 A schematic flow chart of a phase gain calibration method provided for an exemplary embodiment of the present disclosure;

[0022] Figure 6 A schematic flow chart of a voltage and current gain calibration method provided by an exemplary embodiment of the present disclosure;

[0023] Figure 7A schematic diagram of an electrical test output pulse waveform provided for an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the principles and spirit of the present disclosure will be described with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0025] It should be understood herein that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction rather than having any limiting meaning.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The article "one" or "a" before an element does not exclude the existence of multiple such elements.

[0027] The principle and spirit of the present disclosure are explained in detail below with reference to several representative embodiments of the present disclosure.

[0028] As described in the background technology, charging and discharging load monitoring terminals, such as intelligent fusion terminals, energy controllers, smart energy units, etc., are intelligent collection and control terminals installed in low-voltage substations. They meet the needs of high-performance concurrency, large-capacity storage, multiple collection objects, on-site analysis and decision-making, and collaborative computing. They have functions such as data collection, equipment operation status monitoring, and power metering, and support marketing, power distribution, and emerging business development needs.

[0029] The calibration of charging and discharging load monitoring terminals in related technologies, such as intelligent fusion terminals, energy controllers, and smart energy units, requires the use of a three-phase standard source, which is connected to the terminal through a network port and manually calibrated by the power method. However, due to the accuracy and stability of the three-phase standard source, not only is the calibration accuracy low, but the manual operation is time-consuming and laborious.

[0030] The following is a detailed introduction to the power method used in related technologies:

[0031] Power method: By reading the power value, the standard value output by the standard source is compared with the actual measured value detected by the meter under test, and the error of the meter under test is calculated.

[0032] The following is a detailed introduction to the power-based calibration scheme used in related technologies:

[0033] The metering verification scheme for intelligent integrated terminals in substations in related technologies uses the power method to verify the phase and power of the terminal. The terminal baseboard first reads the actual value of the power to be verified, and then reads the standard power value issued by the mainboard to calculate the error. If the error is greater than the specified range, the verification is terminated, the input quantity is checked, and the verification is performed again; if the error is within the allowable range, calibration is performed and the calibrated data is written.

[0034] The inventors of the present disclosure have found that the disadvantage is that the calibration accuracy of the power method is affected by the accuracy and stability of the standard source output, and the fluctuation of the standard value over time during the calibration process will reduce the accuracy of the terminal calculation error.

[0035] In order to solve the above problems, the present disclosure provides a calibration scheme for a charging and discharging load monitoring terminal. The method can be applied to the calibration of charging and discharging load monitoring terminals such as intelligent fusion terminals, energy controllers, and smart energy units in substations, and specifically includes: connecting an electric energy verification device to the charging and discharging load monitoring terminal to be calibrated; setting the electric energy verification device to a first parameter, and verifying the charging and discharging load monitoring terminal with the electric energy verification device set to the first parameter to obtain a first electric energy error, sending the first electric energy error to the charging and discharging load monitoring terminal, and calibrating the meter constant of the charging and discharging load monitoring terminal based on the first electric energy error; setting the electric energy verification device to a second parameter, and verifying the charging and discharging load monitoring terminal that has completed the meter constant calibration with the electric energy verification device set to the second parameter to obtain a second electric energy error, sending the second electric energy error to the charging and discharging load monitoring terminal, and calibrating the power gain of the charging and discharging load monitoring terminal based on the second electric energy error; expanding the meter constant of the electric energy verification device by a specified multiple , and set it as the third parameter, reduce the calibration value of the meter constant register of the charging and discharging load monitoring terminal by the specified times, expand the meter constant by the specified times and set it as the third parameter, calibrate the charging and discharging load monitoring terminal that has completed the power gain calibration and reduced the calibration value of the meter constant register by the specified times to obtain a third electric energy error, send the third electric energy error to the charging and discharging load monitoring terminal, and perform phase gain calibration on the charging and discharging load monitoring terminal based on the third electric energy error; set the electric energy calibration device to the fourth parameter, calibrate the charging and discharging load monitoring terminal that has completed the phase gain calibration through the electric energy calibration device set to the fourth parameter, so that the charging and discharging load monitoring terminal obtains voltage and current detection values, sends the voltage and current standard values ​​to the charging and discharging load monitoring terminal, obtains voltage and current error values ​​based on the voltage and current detection values ​​and the voltage and current standard values, and performs voltage and current gain calibration on the charging and discharging load monitoring terminal based on the voltage and current error values.

[0036] Among them, the influence of the stability of the standard source power supply on the calibration accuracy is reduced, and the calibration accuracy is improved; and, since the meter constant of the electric energy verification device is enlarged by a specified multiple and the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by a specified multiple, the pulse output is accelerated, the error verification time is shortened, and the calibration speed is improved.

[0037] Specifically, an improved standard meter method is used for calibration. By applying the same voltage and current to the standard meter and the meter under test, the electric energy measured by the standard meter and the meter under test is compared, and the relative power error of the meter under test is calculated to weaken the influence of the stability of the standard source power supply on the calibration accuracy.

[0038] During split-phase calibration, the pulse output is accelerated by increasing the pulse constant of the calibration device by N times and reducing the pulse constant calibration value of the meter at the charge and discharge load monitoring terminal by N times, especially saving the error reading time of small currents, thereby achieving high-precision and fast calibration of the charge and discharge load monitoring terminal.

[0039] After introducing the basic principles of the present disclosure, various non-limiting embodiments of the present disclosure are described in detail below.

[0040] refer to Figure 1 , which is a schematic diagram of an application scenario of a trusted calibration system for a charging and discharging load monitoring terminal provided by an exemplary embodiment of the present disclosure.

[0041] This application scenario includes: an electric energy verification device 110 and a charge and discharge load monitoring terminal 120 to be calibrated; wherein the electric energy verification device 110 and the charge and discharge load monitoring terminal 120 are connected via an RS485 bus 130 to achieve communication.

[0042] The electric energy verification device 110 is installed with matching calibration software, which is used to generate corresponding calibration instructions according to the calibration items of the charge and discharge load monitoring terminal 120 using the matching calibration software.

[0043] In specific implementation, the electric energy verification device 110 includes a meter constant calibration module, a power gain calibration module, a phase gain calibration module and a voltage and current gain calibration module. Correspondingly, the calibration items include: meter constant calibration, power gain calibration, phase gain calibration and voltage and current gain calibration.

[0044] The charge and discharge load monitoring terminal 120 communicates with the electric energy testing device 110, and is used to receive the test environment and calibration signal output by the electric energy testing device 110, and perform corresponding calibration items. After the calibration is completed, the calibration result is stored in the iron electric.

[0045] Combine the following Figure 1 The application scenarios are used to describe the trusted calibration method and system for the charge and discharge load monitoring terminal according to the exemplary embodiment of the present disclosure. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of the present disclosure, and the embodiments of the present disclosure are not limited in this respect. On the contrary, the embodiments of the present disclosure can be applied to any applicable scenario.

[0046] refer to Figure 2 , which is a flow chart of a trusted calibration method for a charging and discharging load monitoring terminal provided by an exemplary embodiment of the present disclosure.

[0047] The trusted calibration method for a charge and discharge load monitoring terminal includes the following steps:

[0048] Step S210: Connect the electric energy verification device to the charge and discharge load monitoring terminal to be calibrated.

[0049] In this exemplary embodiment, the step of connecting the electric energy verification device to the charge and discharge load monitoring terminal to be calibrated includes:

[0050] Connecting the electric energy verification device to the charge and discharge load monitoring terminal via the RS485 bus;

[0051] Obtaining the device address of the charge and discharge load monitoring terminal through the RS485 bus;

[0052] In response to obtaining the device address, it is determined that the electric energy verification device is connected to the charge and discharge load monitoring terminal.

[0053] In specific implementation, the power verification device is connected to the charge and discharge load monitoring terminal through the RS485 bus to achieve communication, further realizing stable data transmission and remote control of equipment. In the smart distribution network, the RS485 bus has the advantages of strong anti-interference ability and long transmission distance, so it can be used for data communication between smart terminals and various monitoring and control equipment. Specifically for the power verification device, through the RS485 bus, the power verification device can be effectively connected to the charge and discharge load monitoring terminal to realize real-time data collection and transmission.

[0054] In addition, RS485 bus also supports multi-point communication. On this basis, multiple power verification devices or other intelligent devices can be connected through a single bus to build a centralized monitoring and management system. Such a system not only improves the efficiency of data management, but also facilitates the maintenance and troubleshooting of the entire low-voltage distribution network.

[0055] In the specific implementation, the device address of the charge and discharge load monitoring terminal is obtained through the RS485 bus to verify whether the connection of the electric energy verification device is completed, including the following steps:

[0056] Determine the device address: Each device connected to the RS485 bus has a unique device address, which is used to identify the device on the bus to ensure that data can be correctly sent to the designated device.

[0057] Configure communication parameters: Before connecting, you need to ensure that the communication parameters of the power verification device (such as baud rate, data bit, stop bit, and parity bit) are consistent with the communication parameters of the charge and discharge load monitoring terminal.

[0058] Initialize RS485 interface: Initialize RS485 communication interface on the electric energy verification device or intelligent terminal, and set the correct device address and communication parameters.

[0059] Send address request: The electric energy verification device sends an address request signal through the RS485 bus. This signal contains the address information of the device requesting connection.

[0060] Receive address response: After receiving the address request, the charge and discharge load monitoring terminal will determine whether to respond to the request based on the built-in logic. If the requested address matches the terminal's address, the terminal will return a response signal.

[0061] Confirm the connection: After receiving the response signal, the electric energy verification device confirms that the device address of the charge and discharge load monitoring terminal has been obtained and the connection between the two has been established.

[0062] Data exchange: Once the connection is established, the electric energy verification device can start exchanging data with the charge and discharge load monitoring terminal, including sending commands, receiving data, etc.

[0063] Monitoring and diagnosis: During the connection process, monitor the communication status on the RS485 bus to ensure the stability and reliability of data transmission. If communication problems are encountered, make corresponding diagnosis and adjustments.

[0064] Step S220, setting the electric energy verification device to a first parameter, verifying the charge and discharge load monitoring terminal by using the electric energy verification device set to the first parameter to obtain a first electric energy error, sending the first electric energy error to the charge and discharge load monitoring terminal, and calibrating the meter constant of the charge and discharge load monitoring terminal based on the first electric energy error.

[0065] refer to Figure 3 , the meter constant calibration method comprises the following steps:

[0066] Step S310, setting the electric energy verification device to phase combination, power factor 1.0, 220V voltage and 1.5A current.

[0067] In this exemplary embodiment, setting the electric energy verification device to the first parameter includes:

[0068] The electric energy verification device is set to phase combination, power factor 1.0, 220V voltage and 1.5A current.

[0069] When implementing it, turn on the electric energy verification device and enter the settings menu:

[0070] Select the phase combination mode; set the power factor to 1.0; adjust the voltage to 220V; adjust the current to 1.5A; confirm all settings and start the test.

[0071] Step S320: provide voltage and current to the charge and discharge load monitoring terminal through the electric energy verification device, so that the charge and discharge load monitoring terminal feeds back a pulse detection value to the electric energy verification device, obtains the first electric energy error based on the pulse standard value and the pulse detection value, and sends the first electric energy error to the charge and discharge load monitoring terminal.

[0072] In this exemplary embodiment, the step of verifying the charge and discharge load monitoring terminal by the electric energy verification device set to the first parameter to obtain the first electric energy error includes:

[0073] Providing voltage and current to the charge and discharge load monitoring terminal through the electric energy verification device set to the first parameter, so that the charge and discharge load monitoring terminal feeds back a pulse detection value to the electric energy verification device;

[0074] The first electric energy error is obtained based on a pulse standard value and the pulse detection value.

[0075] In specific implementation, the electric energy error is expressed as a percentage, and the calculation formula is:

[0076] Electric energy error (%) = (pulse detection value − pulse standard value) / pulse standard value.

[0077] Step S330: The charging and discharging load monitoring terminal determines whether the first electric energy error is within a first allowable range.

[0078] When the first electric energy error is within the first allowable range, executing step S340;

[0079] When the first electric energy error is not within the first allowable range, step S350 is executed.

[0080] During specific implementation, the values ​​of the first allowable range, and the second allowable range and the third allowable range described below can be configured according to actual needs.

[0081] As a specific example, the values ​​of the first allowable range, the second allowable range, and the third allowable range are -20% to -30%.

[0082] Step S340, reading the meter constant register value from the register of the charge and discharge load monitoring terminal, calculating the meter constant register calibration value based on the first electric energy error and the meter constant register value, and writing the meter constant register calibration value into the register.

[0083] In this exemplary embodiment, the step of calibrating the meter constant of the charge and discharge load monitoring terminal based on the first electric energy error includes:

[0084] In response to determining that the first electric energy error is within a first allowable range, reading an electric meter constant register value from a register of the charge and discharge load monitoring terminal;

[0085] Based on the first electric energy error and the meter constant register value, the meter constant register calibration value is calculated and written into the register.

[0086] In this exemplary embodiment, the step of calculating the meter constant register calibration value based on the first electric energy error and the meter constant register value includes:

[0087] Adding one to the first electric energy error to obtain a sum;

[0088] The meter constant register value is multiplied by the sum to obtain the meter constant register calibration value.

[0089] In a specific implementation, the step of calculating the calibration value of the meter constant register based on the first electric energy error and the meter constant register value includes:

[0090] Meter constant register calibration value = H1 (1 + err)

[0091] Wherein, H1 represents the meter constant register value, and err represents the first electric energy error.

[0092] In specific implementation, the meter constant register calibration value is calculated based on the first electric energy error and the meter constant register value. After the meter constant register calibration value is written into the register, when the current meter constant register value is read next time, the value read is the meter constant register calibration value written last time.

[0093] In specific implementation, the meter constant is also called the pulse constant, which refers to: a fixed parameter for the verification and calibration of the energy meter, indicating the number of pulses per kilowatt-hour, with the unit of imp / kWh (pulses per kilowatt-hour). For example, the pulse constant of the intelligent fusion terminal in the substation area is 10000imp / kWh, which means that 10000 pulses accumulated represent 1kWh, that is, the output of 1 pulse represents the energy consumption of 1 / 10000kWh.

[0094] An electric energy meter refers to an instrument that calculates electric energy. It converts the voltage value representing the power into pulse outputs of different frequencies through a voltage-frequency converter. The greater the power, the greater the frequency; conversely, the smaller the power, the smaller the frequency.

[0095] Electric energy refers to the integral of power over time, which is a cumulative value.

[0096] Step S350, end the verification, check the input amount and then re-verify.

[0097] In the above exemplary embodiment, only the case where the first electric energy error is within the first allowable range is introduced. If the first electric energy error is not within the first allowable range:

[0098] In response to determining that the first electric energy error is not within the first allowable range, the verification is terminated, and the verification is repeated after checking the input quantity.

[0099] In a specific implementation, checking the input quantity refers to checking the voltage and current provided by the electric energy verification device to the charge and discharge load monitoring terminal, and checking the wiring.

[0100] Step S230, setting the electric energy verification device to a second parameter, verifying the charge and discharge load monitoring terminal that has completed the meter constant calibration by using the electric energy verification device set to the second parameter to obtain a second electric energy error, sending the second electric energy error to the charge and discharge load monitoring terminal, and performing power gain calibration on the charge and discharge load monitoring terminal based on the second electric energy error.

[0101] refer to Figure 4 , a power gain calibration method, comprising the following steps:

[0102] Step S410, setting the electric energy verification device to phase separation, power factor 1.0, 220V voltage and 1.5A current.

[0103] In this exemplary embodiment, setting the electric energy verification device to the second parameter includes:

[0104] The electric energy verification device is set to phase separation, power factor 1.0, 220V voltage and 1.5A current.

[0105] When implementing it, turn on the electric energy verification device and enter the settings menu:

[0106] Select split-phase mode; set the power factor to 1.0; adjust the voltage to 220V; adjust the current to 1.5A; confirm all settings and start the test.

[0107] Step S420: Provide voltage and current to the charge and discharge load monitoring terminal that has completed the calibration of the electric meter constant through the electric energy verification device, so that the charge and discharge load monitoring terminal feeds back the pulse detection value to the electric energy verification device, obtains the second electric energy error based on the pulse standard value and the pulse detection value, and sends the second electric energy error to the charge and discharge load monitoring terminal.

[0108] In this exemplary embodiment, the electric energy verification device set to the second parameter verifies the charge and discharge load monitoring terminal that has completed the meter constant calibration to obtain the second electric energy error, including:

[0109] The electric energy verification device set to the second parameter provides voltage and current to the charge and discharge load monitoring terminal that has completed the meter constant calibration, so that the charge and discharge load monitoring terminal feeds back the pulse detection value to the electric energy verification device;

[0110] The second electric energy error is obtained based on the pulse standard value and the pulse detection value.

[0111] In specific implementation, the electric energy error is expressed as a percentage, and the calculation formula is:

[0112] Electric energy error (%) = (pulse detection value − pulse standard value) / pulse standard value.

[0113] Step S430: The charging and discharging load monitoring terminal determines whether the second electric energy error is within a second allowable range.

[0114] When the second electric energy error is within the second allowable range, executing step S440;

[0115] When the second electric energy error is not within the second allowable range, step S450 is executed.

[0116] Step S440: Calculate a power gain register calibration value based on the second electric energy error, and write the power gain into a register of the charge and discharge load monitoring terminal.

[0117] In this exemplary embodiment, the performing power gain calibration on the charging and discharging load monitoring terminal based on the second electric energy error includes:

[0118] In response to determining that the second electric energy error is within a second allowable range, a power gain register calibration value is calculated based on the second electric energy error, and the power gain is written into a register of the charge and discharge load monitoring terminal.

[0119] In this exemplary embodiment, the step of calculating and obtaining a power gain register calibration value based on the second electric energy error includes:

[0120] adding one to the second electric energy error to obtain a sum;

[0121] The second electric energy error is inverted and divided by the sum to obtain the power gain register calibration value.

[0122] The formula is as follows:

[0123] Gain_P=-err / (1+err);

[0124] Wherein, Gain_P represents the power gain register calibration value, and err represents the second electric energy error.

[0125] Step S450, end the verification, check the input amount and then re-verify.

[0126] In the above exemplary embodiment, only the case where the second electric energy error is within the second allowable range is introduced. If the second electric energy error is not within the second allowable range:

[0127] In response to determining that the second electric energy error is not within the second allowable range, the verification is terminated, and the verification is repeated after checking the input quantity.

[0128] In a specific implementation, checking the input quantity refers to checking the voltage and current provided by the electric energy verification device to the charge and discharge load monitoring terminal, and checking the wiring.

[0129] Step S240, enlarging the meter constant of the electric energy verification device by a specified multiple and setting it as a third parameter, reducing the calibration value of the meter constant register of the charge and discharge load monitoring terminal by the specified multiple, and calibrating the charge and discharge load monitoring terminal that has completed the power gain calibration and reduced the calibration value of the meter constant register by the specified multiple by the electric energy verification device whose meter constant is enlarged by the specified multiple and set as the third parameter to obtain a third electric energy error, sending the third electric energy error to the charge and discharge load monitoring terminal, and performing phase gain calibration on the charge and discharge load monitoring terminal based on the third electric energy error.

[0130] In this exemplary embodiment, the meter constant of the electric energy verification device is enlarged by a specified multiple, and the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by the specified multiple, including:

[0131] The specified times is less than 27 times.

[0132] refer to Figure 7 , which shows the definition of the electrical test output pulse waveform, where: the pulse width ton is greater than or equal to 30ms; the time interval toff between adjacent pulses is greater than or equal to 30ms; the transition time should not exceed 5ms.

[0133] Therefore, a pulse output cycle of 80ms can be used. The size of this cycle determines the maximum pulse constant that can be taken under a certain current specification. Assuming the pulse output cycle is τ, the following formula can be used to calculate that the maximum pulse constant under the conditions of voltage 220V, single-phase current (1.5A), power factor 0.5L, and pulse cycle 80ms should be less than 272727imp / kWh. If the pulse constant of the charge and discharge load monitoring terminal is 10000, then N should be less than 27.

[0134]

[0135] Where: Crepresents the meter constant, Un Indicates voltage, I represents the current, PF Indicates power factor τ Identifies the pulse output period.

[0136] The following will introduce the principle of reducing the meter constant of the electric energy verification device and the calibration value of the meter constant register of the charge and discharge load monitoring terminal by a specified multiple:

[0137] In the standard meter method, the same voltage and current are applied to the standard meter and the meter under test. By reading the pulse electric energy, the electric energy measured by the standard meter and the meter under test is compared to calculate the error of the meter under test. The standard meter calibration method has a much looser requirement on power supply stability because the standard meter and the meter under test are in a synchronized state. As long as the measurement accuracy and stability of the standard meter meet the requirements, its calibration accuracy is higher than that of the power method.

[0138] However, when the current is low, the calibration time is much slower than the power method because the output of the electric energy pulse is slow. Taking the error verification process under the conditions of the meter constant of 10000, voltage of 220V, single-phase current of Imin (0.015A), and power factor of 0.5L as an example, the interval between two pulses is 218s. If the error is averaged after two verifications, the verification time will exceed 7 minutes, which does not include the transition time of the verification device switching from output to stable output state.

[0139] ;

[0140] Where: C represents the meter constant, Un Indicates voltage, I represents the current, PF Indicates the power factor.

[0141] In order to solve the problem of long calibration time of the standard meter method, the present disclosure reduces the meter constant by N times. Since the error calibration time is inversely proportional to the meter constant, when the meter constant is reduced by N times, the error calibration time will be reduced by N times.

[0142] refer to Figure 5 , a phase gain calibration method, comprising the following steps:

[0143] Step S510, enlarge the meter constant of the electric energy verification device by a specified multiple, and set the electric energy verification device to phase separation, power factor 0.5L, 220V voltage and 1.5A current.

[0144] In this exemplary embodiment, the electric energy verification device is set to the third parameter, including:

[0145] The electric energy verification device is set to phase separation, power factor 0.5L, 220V voltage and 1.5A current.

[0146] When implementing it, turn on the electric energy verification device and enter the settings menu:

[0147] Select split-phase mode; set the power factor to 0.5L; adjust the voltage to 220V; adjust the current to 1.5A; confirm all settings and start the test.

[0148] Step S520, reducing the calibration value of the meter constant register of the charging and discharging load monitoring terminal by the specified times, and the electric energy verification device that enlarges the meter constant by the specified times provides voltage and current to the charging and discharging load monitoring terminal that has completed the power gain calibration and reduced the calibration value of the meter constant register by the specified times, so that the charging and discharging load monitoring terminal feeds back the pulse detection value to the electric energy verification device, obtains the third electric energy error based on the pulse standard value and the pulse detection value, and sends the third electric energy error to the charging and discharging load monitoring terminal.

[0149] In this exemplary embodiment, the third electric energy error is obtained by calibrating the charging and discharging load monitoring terminal after the power gain calibration is completed and the calibration value of the meter constant register is reduced by the specified times through the electric energy calibration device which enlarges the meter constant by the specified times and sets it as the third parameter, including:

[0150] The electric energy verification device, which enlarges the electric meter constant by the specified times and sets it as the third parameter, provides voltage and current to the charge and discharge load monitoring terminal, which completes the power gain calibration and reduces the calibration value of the electric meter constant register by the specified times, so that the charge and discharge load monitoring terminal feeds back the pulse detection value to the electric energy verification device;

[0151] The third power error is obtained based on the pulse standard value and the pulse detection value.

[0152] In specific implementation, the electric energy error is expressed as a percentage, and the calculation formula is:

[0153] Electric energy error (%) = (pulse detection value − pulse standard value) / pulse standard value.

[0154] Step S530: The charging and discharging load monitoring terminal determines whether the third electric energy error is within a third allowable range.

[0155] When the third electric energy error is within the third allowable range, executing step S540;

[0156] When the third electric energy error is not within the third allowable range, step S560 is executed.

[0157] Step S540: Calculate a phase gain register calibration value based on the third electric energy error, and write the phase gain into a register of the charge and discharge load monitoring terminal.

[0158] In this exemplary embodiment, the phase gain calibration of the charge and discharge load monitoring terminal based on the third electric energy error includes:

[0159] In response to determining that the third power error is within a third allowable range, a phase gain register calibration value is calculated based on the third power error, and the phase gain is written into a register of the charge and discharge load monitoring terminal.

[0160] In this exemplary embodiment, the step of calculating the phase gain register calibration value based on the third electric energy error includes:

[0161] The third electric energy error is inverted and divided by a specified constant to obtain the phase gain register calibration value.

[0162] As a specific example, the specified constant may be 1.732.

[0163] The formula is as follows:

[0164] Gain_Phase=-err / 1.732;

[0165] Wherein, Gain_Phase represents the phase gain register calibration value, err represents the third electric energy error, and 1.732 is the specified constant.

[0166] Step S550, restore the calibration value of the meter constant register reduced by the specified times to the original value, and write the calibration value of the meter constant register restored to the original value into the register.

[0167] In this exemplary embodiment, after the phase gain is written into the register of the charge and discharge load monitoring terminal, that is, after the phase gain calibration is completed, the method further includes:

[0168] The calibration value of the meter constant register reduced by the specified times is restored to the original value, and the calibration value of the meter constant register restored to the original value is written into the register.

[0169] Step S560, end the verification, check the input amount and re-verify.

[0170] In the above exemplary embodiment, only the case where the third electric energy error is within the third allowable range is introduced. If the third electric energy error is not within the third allowable range:

[0171] In response to determining that the third electric energy error is not within the third allowable range, the verification is terminated, and the verification is repeated after checking the input amount.

[0172] In a specific implementation, checking the input quantity refers to checking the voltage and current provided by the electric energy verification device to the charge and discharge load monitoring terminal, and checking the wiring.

[0173] Step S250, setting the electric energy verification device to the fourth parameter, and verifying the charge and discharge load monitoring terminal that has completed the phase gain calibration through the electric energy verification device set to the fourth parameter, so that the charge and discharge load monitoring terminal obtains voltage and current detection values, and sends the voltage and current standard values ​​to the charge and discharge load monitoring terminal, and obtains voltage and current error values ​​based on the voltage and current detection values ​​and the voltage and current standard values, and performs voltage and current gain calibration on the charge and discharge load monitoring terminal based on the voltage and current error values.

[0174] refer to Figure 6 , the voltage and current gain calibration method comprises the following steps:

[0175] Step S610, setting the electric energy verification device to phase combination, power factor 1.0, 220V voltage and 1.5A current.

[0176] In this exemplary embodiment, setting the electric energy verification device to the fourth parameter includes:

[0177] The electric energy verification device is set to phase combination, power factor 1.0, 220V voltage and 1.5A current.

[0178] When implementing it, turn on the electric energy verification device and enter the settings menu:

[0179] Select the phase combination mode; set the power factor to 1.0; adjust the voltage to 220V; adjust the current to 1.5A; confirm all settings and start the test.

[0180] Step S620: providing voltage and current to the charge and discharge load monitoring terminal that has completed the phase gain calibration through the electric energy verification device, so that the charge and discharge load monitoring terminal obtains voltage and current detection values; the electric energy verification device sends the voltage and current standard values ​​to the charge and discharge load monitoring terminal; and the charge and discharge load monitoring terminal obtains voltage and current error values ​​based on the voltage and current detection values ​​and the voltage and current standard values.

[0181] In this exemplary embodiment, the electric energy verification device set as the fourth parameter verifies the charge and discharge load monitoring terminal that has completed the phase gain calibration, so that the charge and discharge load monitoring terminal obtains voltage and current detection values, sends voltage and current standard values ​​to the charge and discharge load monitoring terminal, and obtains voltage and current error values ​​based on the voltage and current detection values ​​and the voltage and current standard values, including:

[0182] The electric energy verification device set as the fourth parameter provides voltage and current to the charge and discharge load monitoring terminal that completes the phase gain calibration, so that the charge and discharge load monitoring terminal obtains voltage and current detection values;

[0183] The electric energy verification device sends the voltage and current standard values ​​to the charge and discharge load monitoring terminal;

[0184] The charge and discharge load monitoring terminal obtains voltage and current error values ​​based on the voltage and current detection values ​​and the voltage and current standard values.

[0185] During specific implementation, the electric energy verification device sends the voltage and current standard values ​​to the charge and discharge load monitoring terminal via the RS485 bus.

[0186] Step S630: calibrate the voltage and current gain of the charge and discharge load monitoring terminal based on the voltage and current error values.

[0187] In this exemplary embodiment, the voltage and current gain calibration of the charge and discharge load monitoring terminal is performed based on the voltage and current error values, including:

[0188] Subtracting the voltage and current standard values ​​from the voltage and current detection values ​​to obtain a difference;

[0189] The difference is divided by the voltage and current detection values ​​to obtain the voltage and current gain register calibration values.

[0190] The formula is as follows:

[0191] Gain_UI=(Data 标 -Data 检 ) / Data 检

[0192] Where, Gain_UI represents the voltage and current gain register calibration value, Data 标 Indicates the standard value of voltage and current, Data 检 Indicates the voltage and current detection values.

[0193] From the above description, it can be seen that the trusted calibration method for the charge and discharge load monitoring terminal provided by the embodiment of the present disclosure reduces the influence of the stability of the standard source power supply on the calibration accuracy and improves the calibration accuracy; and, since the meter constant of the electric energy verification device is enlarged by a specified multiple and the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by a specified multiple, the pulse output is accelerated, the error verification time is shortened, and the calibration speed is improved.

[0194] Specifically, relying on the synchronization of the standard meter and the meter under test in the electric energy verification device and the automatic calculation of the error, the influence of the stability of the standard source power supply on the calibration accuracy is weakened, the calibration accuracy of the charge and discharge load monitoring terminal is improved, and the combination of automation and manual calibration process is realized. At the same time, the calibration of the small current phase gain is calibrated by reducing the meter constant by N times, which can greatly shorten the calibration time. Using a multi-meter electric energy verification table for calibration can improve production efficiency and reduce production costs.

[0195] In the above exemplary embodiments, the calibration steps in the trusted calibration method for the charging and discharging load monitoring terminal are introduced. However, the present disclosure is not limited thereto. In some possible implementations, the calibration process and calibration parameters may be recorded to form a calibration database.

[0196] In specific implementation, the method of establishing a calibration database includes:

[0197] The calibration method and the first parameter, the second parameter, the third parameter and the fourth parameter are recorded to establish a calibration database.

[0198] Among them, by centrally managing and analyzing the calibration data, the calibration behavior can be traced and audited, thereby improving the reliability of terminal charging and discharging load monitoring.

[0199] Based on the same inventive concept, corresponding to the trusted calibration method for a charge and discharge load monitoring terminal described in any of the above embodiments, the present disclosure also provides a trusted calibration system for a charge and discharge load monitoring terminal.

[0200] A trusted calibration system for a charge-discharge load monitoring terminal, comprising: an electric energy verification device and a charge-discharge load monitoring terminal to be calibrated;

[0201] The electric energy verification device is installed with matching calibration software, which is used to generate corresponding calibration instructions according to the calibration items of the charge and discharge load monitoring terminal using the matching calibration software;

[0202] The charging and discharging load monitoring terminal communicates with the electric energy testing device, is used to receive the test environment and calibration signal output by the electric energy testing device, and performs the corresponding calibration items. After the calibration is completed, the calibration result is stored in the iron electric.

[0203] The trusted calibration system for charge and discharge load monitoring terminal in the above embodiment is used to execute the trusted calibration method for charge and discharge load monitoring terminal as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0204] It should be noted that the above describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0205] In addition, although the operations of the disclosed method are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in this particular order, or that all the operations shown must be performed to achieve the desired results. On the contrary, the steps depicted in the flow chart can be performed in a different order. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.

[0206] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0207] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0208] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power / ground connections to the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device may be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present application are to be implemented (that is, these details should be fully within the scope of understanding of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with changes in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0209] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0210] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

[0211] Although the spirit and principle of the present disclosure have been described with reference to several specific embodiments, it should be understood that the present disclosure is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined to benefit, and such division is only for the convenience of expression. The present disclosure is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the attached claims. The scope of the attached claims conforms to the broadest interpretation, thereby including all such modifications and equivalent structures and functions.

Claims

1. A trusted calibration method for a charge and discharge load monitoring terminal, characterized in that: include: Connect the electric energy verification device to the charge and discharge load monitoring terminal to be calibrated; The electric energy verification device is set to a first parameter, the charge and discharge load monitoring terminal is verified by the electric energy verification device set to the first parameter to obtain a first electric energy error, the first electric energy error is sent to the charge and discharge load monitoring terminal, and the electric meter constant of the charge and discharge load monitoring terminal is calibrated based on the first electric energy error; The electric energy verification device is set to a second parameter, the charge and discharge load monitoring terminal that has completed the meter constant calibration is verified by the electric energy verification device set to the second parameter to obtain a second electric energy error, the second electric energy error is sent to the charge and discharge load monitoring terminal, and the power gain calibration of the charge and discharge load monitoring terminal is performed based on the second electric energy error; The meter constant of the electric energy verification device is enlarged by a specified multiple and set as a third parameter, the calibration value of the meter constant register of the charge and discharge load monitoring terminal is reduced by the specified multiple, the charge and discharge load monitoring terminal that has completed the power gain calibration and the calibration value of the meter constant register is reduced by the specified multiple is verified by the electric energy verification device whose meter constant is enlarged by the specified multiple and set as the third parameter to obtain a third electric energy error, the third electric energy error is sent to the charge and discharge load monitoring terminal, and the phase gain calibration is performed on the charge and discharge load monitoring terminal based on the third electric energy error; The electric energy verification device is set to the fourth parameter, and the charge and discharge load monitoring terminal that has completed the phase gain calibration is verified by the electric energy verification device set to the fourth parameter, so that the charge and discharge load monitoring terminal obtains voltage and current detection values, and the voltage and current standard values ​​are sent to the charge and discharge load monitoring terminal, and voltage and current error values ​​are obtained based on the voltage and current detection values ​​and the voltage and current standard values, and voltage and current gain calibration is performed on the charge and discharge load monitoring terminal based on the voltage and current error values.

2. The method according to claim 1, characterized in that The step of connecting the electric energy verification device to the charge and discharge load monitoring terminal to be calibrated includes: Connecting the electric energy verification device to the charge and discharge load monitoring terminal via the RS485 bus; Obtaining the device address of the charge and discharge load monitoring terminal through the RS485 bus; In response to obtaining the device address, it is determined that the electric energy verification device is connected to the charge and discharge load monitoring terminal.

3. The method according to claim 1, characterized in that The step of verifying the charge and discharge load monitoring terminal by the electric energy verification device set to the first parameter to obtain a first electric energy error includes: Providing voltage and current to the charge and discharge load monitoring terminal through the electric energy verification device set to the first parameter, so that the charge and discharge load monitoring terminal feeds back a pulse detection value to the electric energy verification device; The first electric energy error is obtained based on a pulse standard value and the pulse detection value.

4. The method according to claim 1, characterized in that: The step of calibrating the meter constant of the charge and discharge load monitoring terminal based on the first electric energy error includes: In response to determining that the first electric energy error is within a first allowable range, reading an electric meter constant register value from a register of the charge and discharge load monitoring terminal; Based on the first electric energy error and the meter constant register value, the meter constant register calibration value is calculated and written into the register.

5. The method according to claim 4, characterized in that The step of calculating the meter constant register calibration value based on the first electric energy error and the meter constant register value includes: Adding one to the first electric energy error to obtain a sum; The meter constant register value is multiplied by the sum to obtain the meter constant register calibration value.

6. The method according to claim 1, characterized in that The performing power gain calibration on the charge and discharge load monitoring terminal based on the second electric energy error includes: In response to determining that the second electric energy error is within a second allowable range, a power gain register calibration value is calculated based on the second electric energy error, and the power gain is written into a register of the charge and discharge load monitoring terminal.

7. The method according to claim 6, characterized in that The step of calculating a power gain register calibration value based on the second electric energy error includes: adding one to the second electric energy error to obtain a sum; The second electric energy error is inverted and divided by the sum to obtain the power gain register calibration value.

8. The method according to claim 1, characterized in that The performing phase gain calibration on the charge and discharge load monitoring terminal based on the third electric energy error includes: In response to determining that the third power error is within a third allowable range, a phase gain register calibration value is calculated based on the third power error, and the phase gain is written into a register of the charge and discharge load monitoring terminal.

9. The method according to claim 8, characterized in that The step of calculating a phase gain register calibration value based on the third electric energy error comprises: The third electric energy error is inverted and divided by a specified constant to obtain the phase gain register calibration value.

10. A trusted calibration system for a charge and discharge load monitoring terminal, characterized in that: Used to implement the trusted calibration method for a charge-discharge load monitoring terminal as described in any one of claims 1 to 9, the trusted calibration system for a charge-discharge load monitoring terminal comprises: an electric energy verification device and a charge-discharge load monitoring terminal to be calibrated; The electric energy verification device is installed with matching calibration software, which is used to generate corresponding calibration instructions according to the calibration items of the charge and discharge load monitoring terminal using the matching calibration software; The charging and discharging load monitoring terminal communicates with the electric energy testing device, is used to receive the test environment and calibration signal output by the electric energy testing device, and performs the corresponding calibration items. After the calibration is completed, the calibration result is stored in the iron electric.

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