Closing control method and device, electronic equipment and storage medium

Abstract

The invention discloses a closing control method and device, electronic equipment and a storage medium, and the method is applied to a line protection measurement and control device, and comprises the steps: obtaining the voltage amplitude and voltage frequency of a bus side and a line side of the line protection measurement and control device in response to a closing command; according to the voltage amplitude and the voltage frequency, amplitude and frequency requirements of preset closing states are matched, a target closing state of the line protection measurement and control device is obtained, and the preset closing states comprise a non-voltage detection closing state, a same-frequency detection closing state and a difference-frequency detection closing state; and searching an operation control program of the target closing state in a program file of the line protection measurement and control device, and controlling closing according to the operation control program. According to the embodiment of the invention, automatic switching-on control of the protection and measurement integrated device can be realized, the accuracy of line state judgment can be improved, the potential safety hazard of switching-on operation can be reduced, and the stability of voltage operation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy grid connection, and in particular to a closing control method, device, electronic equipment and storage medium. Background Art

[0002] With the development of energy technology, more and more new energy small power sources such as solar energy, photovoltaic and wind power plants are increasing, and the power grid structure is becoming more and more complex. Therefore, the technical requirements for upper line protection and measurement and control functions are getting higher and higher, especially synchronous closing has become a necessary function. For lines with new energy, in order to meet the needs of the operation mode, the line protection and measurement and control device needs to be equipped with a synchronous closing function to achieve grid interconnection. However, when performing synchronous closing operations, it is necessary to consider whether the frequency and voltage on both sides meet the synchronous conditions to avoid oscillation and impact of the impact current on the power grid. Therefore, it is necessary to manually judge the line conditions on both sides of the line protection and measurement and control device, so as to judge the synchronous closing mode, so as to achieve synchronous closing. However, the above-mentioned closing operation requires manual intervention, and the error of manual judgment of the status on both sides of the line is large, and the reliability of the closing operation is poor, which threatens the safe operation of the power grid. Summary of the invention

[0003] The present invention provides a closing control method, device, electronic device and storage medium to realize automatic closing control of an integrated protection and measurement device, which can improve the accuracy of line status judgment, reduce the safety hazards of closing operation, and improve the stability of voltage operation.

[0004] According to one aspect of the present invention, a closing operation method is provided, which is applied to a line protection measurement and control device, and the method comprises:

[0005] In response to a closing command, obtaining voltage amplitudes and voltage frequencies on the bus side and the line side of the line protection and measurement and control device;

[0006] According to the voltage amplitude and the voltage frequency, the amplitude frequency requirements of the preset closing state are matched to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes a closing state for detecting no voltage, a closing state for detecting same frequency, and a closing state for detecting differential frequency;

[0007] The operation control program of the target closing state is searched in the program file of the line protection measurement and control device, and the closing state is controlled according to the operation control program.

[0008] According to another aspect of the present invention, a closing operation device is provided, which is applied to a line protection measurement and control device, and the device comprises:

[0009] A data acquisition module, used for acquiring the voltage amplitude and voltage frequency on the bus side and the line side of the line protection measurement and control device in response to a closing command;

[0010] A state determination module is used to match the amplitude frequency requirements of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes a no-voltage closing state, a same-frequency closing state and a differential-frequency closing state;

[0011] The closing execution module is used to search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing state according to the operation control program.

[0012] According to another aspect of the present invention, there is provided an electronic device, the electronic device comprising:

[0013] at least one processor; and

[0014] a memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the closing control method described in any embodiment of the present invention.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the closing control method described in any embodiment of the present invention when executed.

[0017] The technical solution of the embodiment of the present invention, when a closing command is obtained, the voltage amplitude and voltage frequency of the bus side and the line side of the line protection measurement and control device are obtained, and the voltage amplitude and voltage frequency of the bus side and the line side are matched with the amplitude and frequency requirements of the preset closing state respectively, and the matched preset closing state is used as the target closing state of the line protection measurement and control device. The preset closing state includes a closing state for detecting no-voltage, a closing state for detecting same frequency, and a closing state for detecting differential frequency. The corresponding operation control program is searched in the program file of the line protection measurement and control device according to the target closing state, and the corresponding operation control program is searched according to the corresponding operation control program. The operation control program performs closing control, and the closing state of the line protection and measurement and control device can be accurately judged by the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device, so as to realize automatic judgment of the closing state of the line protection and measurement and control device, reduce the judgment error of the closing state, and realize closing operation based on the operation program corresponding to the closing state, so as to improve the normalization degree of closing operation, improve the accuracy of closing control, reduce the impact current generated by closing operation, thereby reduce the oscillation and impact of impact current on the power grid, and improve the stability of power grid operation.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is an example diagram of a closing control scenario provided according to an embodiment of the present invention;

[0021] Figure 2 is a flow chart of a closing control method provided according to Embodiment 1 of the present invention;

[0022] Figure 3 is a flow chart of another closing control method provided according to the second embodiment of the present invention;

[0023] Figure 4 is a flow chart of another closing control method provided according to Embodiment 3 of the present invention;

[0024] Figure 5 is a flow chart of another closing control method provided according to Embodiment 4 of the present invention;

[0025] Figure 6 is an example diagram of a closing control method according to Embodiment 5 of the present invention;

[0026] Figure 7 This is an example diagram of an initial state discrimination condition provided according to Embodiment 5 of the present invention;

[0027] Figure 8 This is an example diagram of a no-pressure closing state judgment condition provided according to Embodiment 5 of the present invention;

[0028] Fig. 9 This is an example diagram of a same-frequency and difference-frequency closing state discrimination condition provided according to Embodiment 5 of the present invention;

[0029] Fig.10 This is an example diagram of an operating state discrimination condition provided according to Embodiment 5 of the present invention;

[0030] Fig.11 is a state transition diagram of a state machine provided according to Embodiment 5 of the present invention;

[0031] Fig.12is an example diagram of an interpolation resampling application process provided in Embodiment 5 of the present invention;

[0032] Fig.13 is a flowchart of an interpolation resampling process provided according to Embodiment 5 of the present invention;

[0033] Fig.14 This is an example diagram of a closing operation flag setting process provided in accordance with Embodiment 5 of the present invention;

[0034] Fig.15 This is an example diagram of a closing control method provided according to Embodiment 5 of the present invention;

[0035] Fig.16 This is an example diagram of a voltage-free closing control provided according to Embodiment 5 of the present invention;

[0036] Fig.17 This is an example diagram of a same-frequency detection closing control provided according to Embodiment 5 of the present invention;

[0037] Fig.18 This is an example diagram of a differential frequency closing control provided according to Embodiment 5 of the present invention;

[0038] Fig.19 is an example diagram of a leading angle calculation process provided according to Embodiment 5 of the present invention;

[0039] Fig. 20 is a structural schematic diagram of a closing control device provided according to Embodiment 6 of the present invention;

[0040] Fig.21 It is a structural schematic diagram of an electronic device for implementing the closing control method of an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] At present, in scenarios such as regular line maintenance or grid fault recovery, when distributed power sources are connected to the grid, and when interconnection lines between substations are connected to the grid, the line protection and measurement devices need to perform detection based on parameters such as current and voltage on the bus side and the line side. Only when the voltage difference and voltage phase angle difference on the bus side and the line side of the line protection and measurement devices meet the synchronous grid connection conditions, the closing operation is performed to complete the grid connection of the bus side and the line side. Figure 1 When a small-capacity distributed power source is connected, for a single small-capacity distributed power source, such as a small photovoltaic power station, a wind turbine power station, etc., when they are connected to the distribution network, a line protection and measurement and control device is installed at the common coupling point. The line protection and measurement and control device can detect the voltage and frequency on the bus side and the line side. Only when these conditions meet the synchronization conditions can the line protection and measurement and control device control the distributed power source to be safely connected to the grid. The ideal synchronous closing condition of the line protection and measurement and control device is that the voltage amplitudes on both sides of the circuit breaker are equal, the frequencies are the same, and the instantaneous phase angle difference of the circuit breaker closing is zero degrees. If the frequencies of the line protection and measurement and control devices are the same, the line protection and measurement and control device can accurately measure the voltage amplitude accuracy. The synchronous closing conditions may include: 1) the bus voltage, line voltage, bus side frequency and line side frequency are all within the normal range 2) the difference between the bus side frequency and the line side frequency is within the allowable range 3) the difference between the bus side voltage and the line side voltage is within the allowable range 4) the phase angle between the bus side voltage and the line side voltage is within the allowable range. However, when the voltage frequencies on both sides of the line protection and control device are different, it is difficult for the line protection and control device to accurately determine the bus voltage amplitude, line voltage amplitude, bus voltage phase angle and line voltage phase angle, etc. It is necessary to determine the bus side frequency and the line side frequency respectively, and then determine the voltage amplitude and phase angle, etc., so as to achieve the quasi-synchronous closing function.

[0044] Embodiment 1

[0045] Figure 2This is a flow chart of a closing control method provided according to the first embodiment of the present invention. This embodiment is applicable to the case where a line protection measurement and control device realizes automatic closing control. The method can be executed by a closing control device. The automatic closing control device can be implemented in the form of hardware and / or software. The device can be configured in the line protection measurement and control device or the upper control unit of the line protection measurement and control device. Figure 2 As shown, the method includes:

[0046] Step 110: In response to the closing command, the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device are obtained.

[0047] Among them, the closing command can be a trigger instruction for controlling the line protection and measurement and control device to perform the closing operation. The closing command can be implemented based on the information communication protocol in the line protection and measurement and control device. The closing command can be triggered by the user or automatically triggered according to preset conditions. The voltage amplitude can refer to the maximum offset of the voltage signal relative to the zero point in one cycle, and the voltage frequency can be the number of periodic changes of the voltage signal per unit time. The bus side can be the part where the line protection and measurement and control device is electrically connected to the bus, the bus side can be the side of the line protection and measurement and control device close to the bus, and the line side can be the side away from the bus side and close to the transmission line or distribution line.

[0048] In an embodiment of the present invention, when a closing command is obtained, the voltage amplitude and voltage frequency on the bus side and the line side can be measured by the line protection measurement and control device. It can be understood that the closing command can be triggered by the host computer, input by the user, or triggered by itself according to a specific scenario. For example, the user can send a closing command to the line protection measurement and control device according to his own needs, and the line protection measurement and control device can measure the voltage amplitude and voltage frequency on the bus side and the line side when receiving the closing command. Furthermore, in order to improve the accuracy of the line protection measurement and control device, the line protection measurement and control device can also obtain parameters such as ambient temperature, ambient humidity, current value, and voltage phase when obtaining the closing command.

[0049] Step 120, matching the amplitude and frequency requirements of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes a no-voltage closing state, a same-frequency closing state, and a differential-frequency closing state.

[0050] Among them, the preset closing state can be the state of the pre-configured line protection measurement and control device when performing the closing operation. The preset closing state can be configured according to experience or according to the test configuration. The preset closing state can include the closing state of no voltage detection, the closing state of same frequency detection and the closing state of differential frequency detection, etc. The closing state of no voltage detection can indicate the state of no voltage on the bus side or the line side of the line protection measurement and control device, the closing state of same frequency detection can indicate the state that the voltage frequency on the bus side and the line side of the line protection measurement and control device is the same, and the closing state of differential frequency detection can indicate the state that the voltage frequency on the bus side and the line side of the line protection measurement and control device is different. The amplitude frequency requirement can be the state identification condition configured by the preset closing state. When the voltage amplitude and voltage frequency on the bus side and the circuit side of the line protection measurement and control device meet the amplitude frequency requirement, the line protection measurement and control device meets the preset closing state. The preset closing state and the corresponding amplitude frequency requirement can exist in the form of a configuration file or a program judgment condition, and the configuration file or the program judgment condition can be configured in the line protection measurement and control device or in the host computer of the line protection measurement and control device.

[0051] In an embodiment of the present invention, the amplitude-frequency requirement of each preset closing state can be obtained, and the voltage amplitude and voltage frequency collected on the bus side and the line side are compared with the amplitude-frequency requirement of each preset closing state to determine whether the voltage amplitude and voltage frequency meet the amplitude-frequency requirement. If the voltage amplitude and voltage frequency on the bus side and the line side of the line protection measurement and control device meet the amplitude-frequency requirement of the preset closing state, the preset closing state is used as the target closing state of the line protection measurement and control device. It can be understood that the amplitude-frequency requirements of different preset closing states can be different. For example, the amplitude-frequency requirement for detecting the no-voltage closing state is different from the amplitude-frequency requirement for detecting the same-frequency closing state.

[0052] Step 130: Search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing state according to the operation control program.

[0053] Among them, the program file may be a series of instruction codes stored in the line protection and measurement and control device. The program file may realize the protection, measurement and control functions of the line protection and measurement and control device on the transmission line. The program file may be written and generated based on a specific programming language, and the programming language may include but is not limited to C, C++, Java, Python, etc. The operation control program may be a program code for realizing closing control in the line protection and measurement and control device. The operation control program may control the line protection and measurement and control device to realize the closing function. The operation control program may be located in the program file. The operation control program may be one or more program code blocks in the program file. The operation control program may be stored in association with the preset closing state in the control file, that is, different preset closing states may have their own corresponding operation control programs. The associated storage method may include the program name of the operation control program corresponding to the preset closing state, or the operation control program and the preset closing state have the same identification information, etc.

[0054] In an embodiment of the present invention, the program file of the line protection and measurement and control device can be read, and the operation control program stored in association with the target closing state can be searched in the program file. The line protection and measurement and control device can be controlled to execute the operation control program to close the line protection and measurement and control device.

[0055] The technical solution of the embodiment of the present invention, when a closing command is obtained, the voltage amplitude and voltage frequency of the bus side and the line side of the line protection measurement and control device are obtained, and the voltage amplitude and voltage frequency of the bus side and the line side are matched with the amplitude and frequency requirements of the preset closing state respectively, and the matched preset closing state is used as the target closing state of the line protection measurement and control device. The preset closing state includes a closing state for detecting no-voltage, a closing state for detecting same frequency, and a closing state for detecting differential frequency. The corresponding operation control program is searched in the program file of the line protection measurement and control device according to the target closing state, and the corresponding operation control program is searched according to the corresponding operation control program. The operation control program performs closing control, and the closing state of the line protection and measurement and control device can be accurately judged by the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device, so as to realize automatic judgment of the closing state of the line protection and measurement and control device, reduce the judgment error of the closing state, and realize closing operation based on the operation program corresponding to the closing state, so as to improve the normalization degree of closing operation, improve the accuracy of closing control, reduce the impact current generated by closing operation, thereby reduce the oscillation and impact of impact current on the power grid, and improve the stability of power grid operation.

[0056] Embodiment 2

[0057] Figure 3 is a flow chart of another closing control method provided according to the second embodiment of the present invention. The embodiment of the present invention is a specific embodiment based on the above embodiment. Figure 3The method provided in the embodiment of the present invention specifically includes the following steps:

[0058] Step 210: Acquire the working status information of the line protection measurement and control device, where the working status information includes the opening and closing status of the relay in the line protection measurement and control device and the current value of the load current information.

[0059] Among them, the working status information may be information on the operating status of the line protection and measurement and control device. The working status information may include the operating status of the relay protection function and the operating status of the measurement and control function of the line protection and measurement and control device. The working status information may also include status information of the data acquisition unit of the line protection and measurement and control device, status information of the central processing unit, status information of the communication unit, and status information of the power supply unit.

[0060] In an embodiment of the present invention, the opening and closing state of the relay in the line protection and measurement and control device and the current value of the load current of the line protection and measurement and control device can be obtained, and the obtained opening and closing state and current value can be used as the working state of the line protection and measurement and control device. The relay can include a closing position relay of the line protection and measurement and control device.

[0061] The working state information can be matched with the initial state condition. If the working state information satisfies the initial state condition, it is determined that the line protection measurement and control device has completed the preparation stage for executing the closing operation. Exemplarily, the relay of the working state information is in a closed state, and the load current or load voltage is monitored, so it can be determined that the working state information satisfies the initial state condition.

[0062] Step 220: If the working status information meets the initial execution conditions of the operation control program, respond to the closing command; if the working status information does not meet the initial execution conditions of the operation control program, reacquire the working status information until the newly acquired working status information meets the initial execution conditions.

[0063] Among them, the initial execution condition may be a condition that the line protection measurement and control device is able to perform a closing operation in a ready state, the initial execution condition may at least include state information that limits the normal operation of the line protection measurement and control device, and the initial execution condition may include a state condition that the relay protection function of the line protection measurement and control device is normal and a state condition that the measurement and control function is normal. The initial execution condition may at least include that the opening and closing state is a closed state and that the current value of the load current information is greater than the current threshold.

[0064] Specifically, the initial execution condition can be configured as at least that the relay of the line protection measurement and control device is in a closed state, and that the current value of the load current information of the line protection measurement and control device is greater than the current threshold. When the relay of the line protection measurement and control device is in a closed state and the load current is measured, it can be determined that the working state meets the initial execution condition. It can be understood that the current threshold can be a critical current value for determining that the current value in the line protection measurement and control device is not zero. For example, the current threshold can be 0.04 times the rated current value, or the current threshold can also be a set threshold determined based on experience or experiments, etc.

[0065] In an embodiment of the present invention, the initial execution condition of the operation control program can be extracted, and the working status information can be compared with the initial execution condition to determine whether the working status information of the line protection measurement and control device meets the initial execution condition, that is, to determine whether the opening and closing state is a closed state, and whether the current value in the load current information is greater than the current threshold. When the working status information of the line protection measurement and control device meets the initial execution condition of the operation control program, the line protection measurement and control device can respond to the closing command. Otherwise, the line protection measurement and control device can obtain the opening and closing state of the relay of the line protection measurement and control device and the current value of the load current of the line protection measurement and control device as new working status information at regular or irregular intervals until the working status information of the line protection measurement and control device meets the initial execution condition, and then respond to the closing command.

[0066] Step 230: Obtain the voltage amplitude and voltage frequency on the bus side and the line side of the line protection measurement and control device.

[0067] Step 240: Match the amplitude-frequency requirement of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device.

[0068] Step 250: Search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing state according to the operation control program.

[0069] According to an embodiment of the present invention, the opening and closing states of the relays of the line protection and measurement and control device and the current value of the load current information are obtained as working state information, and a closing command is responded to when the working state information meets the initial execution conditions, and new working state information is re-acquired when the working state information does not meet the initial execution conditions, until the working state information that meets the initial execution conditions is obtained, and the amplitude-frequency requirements of the preset closing state are matched according to the voltage amplitude and the voltage frequency through the voltage amplitude and the voltage frequency on the bus side and the line side of the line protection and measurement and control device, so as to obtain the target closing state of the line protection and measurement and control device, and the operation control program is searched in the program file according to the target closing state, and closing is performed according to the operation control program, so as to ensure that the line protection and measurement and control device meets the initial execution state of the operation control program, thereby ensuring the successful execution of the closing operation, improving the success rate of grid connection, and enhancing the security of the power grid.

[0070] In the embodiment of the present invention, the initial state condition can be configured as at least that the relay of the line protection measurement and control device is in a closed state, and the line protection measurement and control device measures the load current. When the closing position relay of the line protection measurement and control device is in a closed state and the load current is measured, it can be determined that the working state meets the initial state condition. It can be understood that the load current measured by the line protection measurement and control device can be quantitatively determined by the load current value being greater than 0.04 times the rated current value. It can be understood that other quantification methods can also be included in the protection range of the measured load current, for example, the current value of the load current is greater than a certain set threshold value, etc.

[0071] In some embodiments of the invention, the following further comprises: after controlling the closing of the circuit breaker according to the operation control program, the following further comprises:

[0072] The execution time of the operation control program is counted; if the execution time of the operation control program is less than or equal to the grid-connected delay of the target closing state, a grid-connected success flag of the target closing state is set in the storage space of the line protection measurement and control device; otherwise, a grid-connected failure flag of the target closing state is set in the storage space of the line protection measurement and control device.

[0073] Among them, the grid-connection delay can be the time difference between the closing time on the bus side and the closing time on the line side. The grid-connection delay can be pre-configured, and the duration of the grid-connection delay under different target closing states can be different.

[0074] In an embodiment of the present invention, when a closing operation is performed based on a target closing state, the execution time of the closing operation can be counted. If the execution time satisfies the grid-connected delay, which may include that the error between the execution time and the time length of the grid-connected delay is less than a specific error value, then it can be determined that the closing operation corresponding to the target closing state is successfully executed, and the corresponding grid-connected success mark can be set for the target closing state in the storage space of the line protection measurement and control device. Otherwise, the grid-connected failure mark of the target closing state can be set in the storage space of the line protection measurement and control device. Exemplarily, the target closing state is a voltage-free closing state, and its configured grid-connected delay is a seconds. If the execution time of the closing operation actually detected satisfies a, a flag bit can be set for the voltage-free closing state and set to 1, otherwise, the above-mentioned flag bit is set to 0. Further, the above-mentioned storage space for storing the grid-connected success mark or the grid-connected success mark can be located in the line protection measurement and control device, or in the upper computer of the line protection measurement and control device.

[0075] Embodiment 3

[0076] Figure 4 FIG. 1 is a flow chart of another closing control method provided according to Embodiment 3 of the present invention. The present invention introduces the process of determining the target closing state. Figure 4 The method provided in the embodiment of the present invention specifically includes the following steps:

[0077] Step 310: In response to the closing command, the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device are obtained.

[0078] Step 320: If the voltage amplitude on the bus side and the voltage amplitude on the line side match the first amplitude-frequency requirement for detecting the no-voltage closing state, the target closing state is set to the no-voltage closing state, wherein the first amplitude-frequency requirement includes: at least one of the voltage amplitude on the bus side and the voltage amplitude on the line side is less than the first voltage threshold.

[0079] In an embodiment of the present invention, when at least one of the voltage amplitude on the bus side and the voltage amplitude on the line side is less than a first voltage threshold, the target closing state of the line protection and measurement and control device is set to a no-voltage closing state. The first voltage threshold may be a critical value indicating that the voltage value is zero, and the value of the first voltage value may be set based on experience.

[0080] Step 330: If the voltage amplitude and voltage frequency on the bus side, as well as the voltage amplitude and voltage frequency on the line side, match the second amplitude-frequency requirement of the same-frequency closing state, the target closing state is set to the same-frequency closing state, wherein the second amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is less than the first frequency difference threshold.

[0081] Among them, the first frequency difference threshold can be a frequency difference critical value for measuring whether the bus side voltage frequency is the same as the line side voltage frequency. The first frequency difference threshold can be configured according to experience or relevant regulations.

[0082] In an embodiment of the present invention, when the voltage amplitude on the bus side and the voltage amplitude on the line side of the line protection and control device are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is less than the first frequency difference threshold, the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and control device meet the second amplitude-frequency requirement of the same-frequency closing state, and the target closing state of the line protection and control device can be set to the same-frequency closing state.

[0083] Step 340: If the voltage amplitude and voltage frequency on the bus side, as well as the voltage amplitude and voltage frequency on the line side, match the third amplitude-frequency requirement of the differential frequency closing state, the target closing state is set to the differential frequency closing state, wherein the third amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is not less than the first frequency difference threshold.

[0084] In an embodiment of the present invention, when the voltage amplitude on the bus side and the voltage amplitude on the line side of the line protection and control device are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is not less than the first frequency difference threshold, the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and control device meet the third amplitude-frequency requirement of the differential frequency closing state, and the target closing state of the line protection and control device can be set to the differential frequency closing state.

[0085] Step 350: Search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing state according to the operation control program.

[0086] In an embodiment of the present invention, in response to a closing command, the voltage amplitude and voltage frequency on the bus side and the line side are collected by a line protection measurement and control device to obtain the amplitude and frequency requirements of a preset closing state, and the voltage amplitude and voltage frequency on the bus side and the line side are respectively matched with the amplitude and frequency requirements of the preset closing state. When at least one of the voltage amplitude on the bus side and the voltage amplitude on the line side is less than a first voltage threshold, it is determined that the line protection measurement and control device meets the first amplitude and frequency requirements of the no-voltage closing state, and the target closing state of the line protection measurement and control device is set to the no-voltage closing state, when the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency on the bus side is equal to the frequency on the line side. When the frequency difference of the frequencies is less than the first frequency difference threshold, it is determined that the line protection, measurement and control device meets the second amplitude-frequency requirement of the same-frequency closing state, and the target closing state of the line protection, measurement and control device is set to the same-frequency closing state. When the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is not less than the first frequency difference threshold, it is determined that the line protection, measurement and control device meets the third amplitude-frequency requirement of the differential-frequency closing state, and the target closing state of the line protection, measurement and control device is set to the differential-frequency closing state. The operation control program of the target closing state is searched in the program file of the line protection, measurement and control device, and the operation control program is executed to realize the closing operation. The embodiment of the present invention can determine the target closing state satisfied by the line protection measurement and control device within the no-voltage closing state, the same-frequency closing state and the differential-frequency closing state through the collected bus-side and line-side voltage amplitudes and voltage frequencies, thereby reducing the difficulty of determining the target closing state. The corresponding operation control program is obtained through the target closing state, and the closing operation is executed according to the operation control program, which can help improve the accuracy of the closing operation and improve the stability of the power grid operation.

[0087] Embodiment 4

[0088] Figure 5 is a flow chart of another closing control method provided according to the fourth embodiment of the present invention. The embodiment of the present invention introduces the execution process of the closing operation. Figure 5 The method provided in the embodiment of the present invention specifically includes the following steps:

[0089] Step 410: In response to the closing command, the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device are obtained.

[0090] Step 420, matching the amplitude-frequency requirements of the preset closing state according to the voltage amplitude and the voltage frequency, and obtaining the target closing state of the line protection measurement and control device, wherein the preset closing state includes a no-voltage closing state, a same-frequency closing state, and a differential-frequency closing state.

[0091] Step 430, obtaining the voltage amplitude, voltage frequency and voltage phase angle of the bus side at the current moment as the real-time status information of the bus side, and obtaining the voltage amplitude, voltage frequency and voltage phase angle of the line side at the current moment as the real-time status information of the line side.

[0092] In an embodiment of the present invention, after obtaining the target closing state, the voltage amplitude, voltage frequency and voltage phase angle on the bus side and the line side of the line protection measurement and control device can be collected at the current moment, and the collected information can be used as real-time status information on the bus side and real-time status information on the line side, respectively.

[0093] Step 440, query the grid-connected conditions stored in association with the target closing state in the program file of the line protection measurement and control device, wherein the grid-connected conditions include at least one of the following: when the target closing state includes the no-voltage closing state, at least one of the voltage amplitude in the bus-side real-time state information and the voltage amplitude in the line-side real-time state information is less than the second voltage threshold; when the target closing state includes the same-frequency closing state, the voltage difference between the line voltage amplitude of the bus-side real-time state information and the line-side real-time state information is less than the first voltage difference threshold, and the voltage difference between the bus-side real-time state information and the line-side real-time state information is less than the first voltage difference threshold; The phase angle difference of the voltage phase angle is less than the first angle difference constant, and the frequency difference between the voltage frequency of the bus side real-time status information and the line side real-time status information is less than the second frequency difference threshold; when the target closing state includes the differential frequency closing state, the voltage difference between the voltage amplitude of the bus side real-time status information and the line side real-time status information is less than the third voltage difference threshold, the phase difference between the voltage phase angle of the bus side real-time status information and the line side real-time status information is less than the third angle difference constant, and the frequency difference between the voltage frequency of the bus side real-time status information and the line side real-time status information is less than the third frequency difference threshold.

[0094] In an embodiment of the present invention, the grid-connected condition can judge whether the state restriction condition of the bus side and the line side closing and grid-connected can be executed. The specific content of the state restriction condition can be different when the specific situation of the target closing state is different. The grid-connected condition can limit the real-time status information of the bus side and the real-time status information of the line side to specific conditions to avoid the closing operation of the integrated protection and measurement device from having a negative impact on the power grid. The above-mentioned grid-connected conditions include the frequency difference threshold between the frequency in the real-time status information of the bus side and the frequency in the real-time status information of the line side, the voltage difference threshold between the real-time status information of the bus side and the voltage difference threshold between the real-time status information of the line side, and the difference threshold between the frequency change rate of the real-time status information of the bus side and the frequency change rate of the real-time status information of the line side.

[0095] Specifically, when the target closing state includes the no-voltage closing state, the grid-connected condition configured may be specifically that the real-time voltage on the bus side of the real-time status information of the bus side is less than the second voltage threshold, and / or the real-time voltage on the line side of the real-time status information of the line side is less than the second voltage threshold, that is, the second voltage threshold may be a critical value for determining that the voltage amplitude is zero, and in some embodiments of the invention, the value of the second voltage threshold may be the same as the value of the first voltage threshold. When the target closing state is the no-voltage closing state, the grid-connected condition is that the voltage amplitude of at least one of the real-time voltage on the bus side and the real-time voltage on the line side is less than the second voltage threshold, that is, there is no voltage on at least one side of the bus side or the line side, and the closing operation corresponding to the target closing state may be performed on the integrated protection and detection device.

[0096] When the target closing state includes the same-frequency closing state, the grid-connected condition configured for the target closing state is that the target closing state includes the same-frequency closing state, and the grid-connected condition includes that the voltage difference between the bus-side real-time voltage of the bus-side real-time status information and the line-side real-time voltage of the line-side real-time status information is less than the first voltage difference threshold, the sum of the phase difference and the lead angle of the bus-side real-time status information and the line-side real-time status information satisfies the first angle difference constant, and the frequency difference between the bus-side real-time frequency of the bus-side real-time status information and the line-side real-time frequency of the line-side real-time status information is less than the second frequency difference threshold. Among them, the first voltage difference threshold can be a critical value with the same voltage amplitude, and the first voltage difference threshold can be configured according to experience or relevant regulations. The phase difference may be the difference between the voltage phase angle in the real-time status information on the bus side and the voltage phase angle in the real-time status information on the line side. The lead angle may be the voltage phase difference on both sides at the moment of connection generated by the grid-connected operation. The lead angle may be pre-configured. The first angle difference constant may be a critical value indicating that the voltage phase angle on the bus side is equal to the phase angle on the line side. The first angle difference constant may be a pre-set maximum allowable phase difference value. The second frequency difference threshold may be the maximum critical value indicating that the voltage frequency in the real-time status information on the bus side is the same as the voltage frequency in the real-time status information on the line side. The value of the second frequency difference threshold may be the same as the value of the first frequency difference.

[0097] It can be understood that the target closing state includes the same-frequency closing state, and the grid-connected condition corresponding to the target closing state is to measure the voltage amplitude, voltage phase angle and voltage frequency in the real-time status information on the bus side and the real-time status information on the line side. The above-mentioned voltage amplitude, voltage phase angle and voltage frequency can be achieved by using the difference between the voltage amplitude, voltage phase angle and voltage frequency in the real-time status information on the bus side and the real-time status information on the line side and the relationship between the threshold value.

[0098] Similarly, when the target closing state includes the differential frequency closing state, its corresponding grid-connected condition is to determine whether the real-time status information on the bus side is similar to the real-time status information on the line side. The approximation can be measured by a third voltage difference threshold, a third angle difference constant, and a third frequency difference threshold. That is, the voltage difference between the real-time voltage on the bus side and the real-time voltage on the line side of the real-time status information on the line side is less than the third voltage difference threshold, the phase difference between the real-time status information on the bus side and the real-time status information on the line side and the sum of the lead angle meet the third angle difference constant, and the frequency difference between the real-time frequency on the bus side of the real-time status information on the bus side and the real-time frequency on the line side of the real-time status information on the line side is less than the third frequency difference threshold. It can be considered that the real-time status information on the bus side is similar to the real-time status information on the line side, and the integrated protection and detection device corresponding to the real-time status information on the bus side and the real-time status information on the line side can perform the closing operation corresponding to the differential frequency closing state.

[0099] Step 450: If the real-time status information on the bus side and the real-time status information on the line side meet the grid-connected conditions, the operation control program for the target closing state is executed; otherwise, the real-time status information on the bus side and the real-time status information on the line side at the current moment are reacquired until the operation control program for the target closing state is executed.

[0100] In an embodiment of the present invention, when the real-time status information on the bus side and the real-time status information on the line side meet the grid-connected conditions of the target closing state, the operation control program corresponding to the target closing state is executed; otherwise, the real-time status information on the bus side and the real-time status information on the line side at the current moment are acquired again to determine whether the newly acquired real-time status information on the bus side and the real-time status information on the line side meet the grid-connected conditions of the target closing state, until the newly acquired real-time status information on the bus side and the real-time status information on the line side meet the execution conditions of the target closing state, and the operation control program for the target closing state is executed, thereby realizing the closing of the line protection measurement and control device.

[0101] In the embodiment of the present invention, when a closing command is obtained, the target closing state is determined according to the bus-side state information and the line-side state information of the line protection and measurement and control device, the voltage amplitude, voltage frequency and voltage phase angle of the bus-side and the line-side at the current moment are obtained as the bus-side real-time state information and the line real-time state information, respectively, the grid-connected condition associated with the target closing state stored in the program file is obtained, and it is determined whether the bus-side real-time state information and the line real-time state information match the grid-connected condition, and the operation control program of the target closing state is executed when it is determined to match, otherwise, the bus-side real-time state information and the line-side real-time state information at the current moment are re-acquired until the operation control program of the target closing state is executed. In the embodiment of the present invention, the bus-side real-time state information and the line real-time state information are used to match the grid-connected condition of the target closing state before the line protection and measurement and control device executes the operation control program, and it is determined that the line protection and measurement and control device is in the correct grid-connected state, so as to prevent the closing operation from impacting the power grid, thereby further improving the safety of the closing operation and achieving stable operation of the power grid.

[0102] Further, based on the above-mentioned embodiment of the invention, obtaining the real-time status information of the bus side and the real-time status information of the line side of the line protection measurement and control device includes:

[0103] The voltage amplitude, voltage frequency and voltage phase angle of the bus side of at least one cycle are collected as the bus side sampling state information, and the voltage amplitude, voltage frequency and voltage phase angle of the line side are collected as the line side sampling state information, and the time of collecting the voltage amplitude on the bus side is recorded as the bus side sampling moment; the frequency ratio of the voltage frequency on the line side and the voltage frequency on the bus side is determined; the time interval between two adjacent bus side sampling moments is determined, and the product of the frequency ratio and the time interval is used as the line side sampling time interval; the bus side sampling state information is used as the bus side real-time state information, and the line side sampling state information is interpolated according to the line side sampling time interval to obtain the line side real-time state information.

[0104] Among them, a cycle can be the process that voltage or current goes through to complete a complete positive and reverse change. Taking an AC voltage with a frequency of 50HZ as an example, there are 50 cycles per second, and the duration of each cycle is 1 / 50=0.02 seconds. The bus side sampling state information and the line side sampling state information can be state information collected from the bus side and the line side at a specific sampling frequency, respectively. The state information may include but is not limited to voltage, frequency, phase, etc.

[0105] In an embodiment of the present invention, the voltage amplitude, voltage frequency and voltage phase angle of at least one cycle on the bus side can be collected by the line protection measurement and control device as the bus side sampling state information, and the voltage amplitude, voltage frequency and voltage phase angle on the line side can be collected as the line side sampling state information. It can be understood that during the collection process, the collection time of each bus side sampling state information can be recorded at the same time, the bus side sampling time, bus side frequency and line side frequency corresponding to the bus side voltage in the bus side sampling state information can be extracted, and the ratio of the line side frequency divided by the bus side frequency can be calculated as the ratio of the bus side frequency to the line side frequency. The frequency ratio of the rate can be used to determine the time interval between two adjacent bus-side sampling moments. The two adjacent bus-side sampling moments can be two adjacent bus-side sampling moments selected randomly. The product of the frequency ratio and the time interval can be calculated, and the product can be used as the line-side sampling time interval. The line-side sampling status information can be interpolated according to the line-side sampling time interval to obtain status information matching the line-side sampling time interval. The status information can be used as the line-side real-time status information. It can be understood that since the bus side does not perform interval time conversion, the bus-side sampling status information collected by the bus side can be directly used as the bus-side real-time status information.

[0106] The above-mentioned interpolation processing may further include linear interpolation processing, Lagrange interpolation processing, etc.

[0107] Further, based on the above-mentioned embodiment of the invention, the line side sampling state information is interpolated according to the line side sampling time interval to obtain the line side real-time state information, including:

[0108] Performing Lagrange interpolation processing on the line side sampling state information at the line side sampling time interval to obtain initial line side sampling state information;

[0109] Determine that the initial line side sampling state information has an information interpolation position processed by Lagrangian interpolation at twice the line side sampling time interval, and perform Lagrangian interpolation on the initial line side sampling state information at twice the line side sampling time interval;

[0110] When the initial line-side sampling status information and the bus-side sampling status information meet the synchronization condition, the initial line-side sampling status information is used as the line-side real-time status information.

[0111] In an embodiment of the present invention, Lagrangian interpolation processing can be performed according to the line-side sampling state information at the line-side sampling time interval, and the state information sequence after Lagrangian interpolation processing can be used as the initial line-side sampling state information. It can be determined whether the initial line-side sampling state information can continue to be Lagrangian interpolated at twice the line-side sampling time interval. If Lagrangian interpolation processing can be performed, Lagrangian interpolation is continued to be performed on the initial line-side sampling state information at twice the line-side sampling time interval, and the generated state information sequence is used as the new initial line-side sampling state information. When the generated initial line-side sampling state information meets the synchronization condition with the bus-side sampling state information, that is, the voltage amplitude of the initial line-side sampling state information and the bus-side sampling state information are the same or similar, the phase is the same or similar, and the frequency is the same or similar, then the initial line-side sampling state information can be used as the real-time state information of the line side.

[0112] Embodiment 5

[0113] Figure 6 is an example diagram of a closing control method according to Embodiment 5 of the present invention, see Figure 6 In the embodiment of the present invention, based on the state machine, the synchronous closing state of the integrated protection and detection device is divided into five working states: initial state, no-voltage closing state, same-frequency closing state, frequency difference closing state, and operating state. During the synchronous detection process, the synchronous closing condition is judged according to the specific working state. At the same time, the interpolation resampling technology is used in the frequency difference grid connection process to solve the problem of inaccurate calculation of the analog sampling amplitude on the line side at different frequencies. Figure 7 The initial state of the integrated protection and measurement device can be determined by the following conditions: the closing relay HWJ is not in the disconnected state, and the load current I l Greater than 0.04 times the rated power I n . See Figure 8 , the judgment conditions of the no-voltage closing state of the integrated protection and detection device may include no voltage on the bus side and / or no voltage on the line side. Fig. 9 The same frequency closing condition is that there is voltage on the bus side and the line side, and the voltage difference between the bus side and the line side is less than the voltage threshold δ set , and the differential frequency closing condition is that there is voltage on the bus side and the line side, and the voltage difference between the bus side and the line side is greater than or equal to the voltage threshold δ set See also Fig.10 , the operating state judgment condition is that the closing is successful and the load current I l Greater than 0.04 times the rated power I n .and Fig.11The transition mode between different states of the state machine is given. When the switch is disconnected, the device is in the initial state. If it receives a background remote control closing command, it will determine which closing state it is in. After the delayed closing is successful, it will enter the operating state. If the closing fails (possibly due to the secondary circuit and other reasons), the closing state judgment is performed again to achieve secondary closing until the final closing is successful.

[0114] In the embodiment of the present invention, when the differential frequency closing and grid connection are performed, it is difficult for the integrated protection and measurement device to accurately calculate the bus voltage amplitude, line voltage amplitude, bus voltage phase angle and line voltage phase angle at the same time. Fig.12 , the bus side frequency and line side frequency can be calculated by the interpolation resampling method, and then the bus and line side voltage amplitude and phase angle can be accurately measured, thereby achieving the quasi-synchronous closing function.

[0115] The above interpolation resampling process can use Taylor series expansion interpolation. Taking the data sequence (X0, Y0), (X1, Y1), (X2, Y2) as an example, there is a point (X, Y) between these three points such that:

[0116]

[0117] The physical meaning of this theorem is to linearly fit a point between three points in space so that this point exists between these three points to form a linear curve. If these discrete points are connected into a curve, then this curve should be continuous and differentiable.

[0118] The interpolation resampling process can be as follows Fig.13 As shown, the instantaneous value of the bus voltage can be sampled, and the sampling times T1, T2, ..., Tn can be recorded. The instantaneous value of the bus voltage and the sampling time can be cached as buffer and recorded as (X1, T1), (X2, T2), ...

[0119] The maximum value of the buffer is 24. The instantaneous value of the line voltage can be sampled, the line voltage frequency Fsyn can be calculated, the frequency can be converted into the line voltage sampling interval Δt, and it can be determined whether the interpolation time (T1+Δt) exists. If it exists, a second-order interpolation operation is performed with the current sampling interval. If not, the sampling interval Δt is acquired again. After performing a second-order interpolation operation, it can be determined whether the interpolation time (T1+2Δt) exists. If it exists, a second-order interpolation operation is performed again with T1+2Δt to obtain a new instantaneous value after resampling.

[0120] Furthermore, when executing the closing operation, the execution result of the closing operation can also be marked. The marking process can be as follows: Fig.14As shown, different closing and grid-connected flags are set to facilitate determination of whether the closing operation is successful.

[0121] In some inventive embodiments, see Fig.15 , the grid connection methods can include: 1) automatic detection of no-voltage grid connection 2) same frequency grid connection 3) difference frequency grid connection. Frequency difference grid connection is the grid connection of two unrelated systems or generator sets. For frequency difference grid connection, the protection and measurement and control device can obtain complete data of the line side voltage within one cycle after interpolation resampling. If the current protection and measurement and control device is a 24-point sampling in one cycle, then the amplitude of the voltage in the same period can be accurately measured in real time.

[0122] Specifically, the implementation logic for automatic voltage-free grid connection is as follows: Fig.16 As shown, when there is no pressure on at least one of the bus side or the line side, closing is performed according to the no-pressure closing state.

[0123] See also Fig.17 , where 1) fm is the bus frequency, fx is the line frequency, δ is the frequency difference threshold, and the threshold can be adjusted. 2) Um is the bus voltage, Ux is the line voltage frequency, ΔUset is the voltage difference constant 3) phasem is the bus voltage angle, phasex is the line voltage angle, phaseΔ is the lead angle, and the lead angle is generally fixed in the same frequency grid-connected mode, and Δphaseset is the angle difference constant.

[0124] In the embodiment of the present invention, in the same-frequency detection and closing state, the frequency difference, phase difference and voltage difference are respectively judged, and the same-frequency detection and closing and grid connection are executed when all conditions are met.

[0125] In some embodiments of the invention, in the frequency difference grid connection mode, the frequency difference grid connection satisfies the following four conditions:

[0126] 1) The bus side frequency and line side frequency are both within the normal range;

[0127] 2) The difference between the bus side frequency and the synchronous side frequency is within a certain range;

[0128] 3) The difference between the bus side voltage and the synchronous side voltage amplitude is within a certain range;

[0129] 4) The difference between the bus side voltage phase angle and the synchronous side voltage phase angle is within a certain range.

[0130] See also Fig.18, where 1) fm is the bus side frequency, fx is the line side frequency, δ is the frequency difference threshold value, and the threshold value can be adjusted; 2) Um is the bus side voltage, Ux is the line side voltage frequency, and ΔUset is the voltage difference constant; 3) phasem is the bus side voltage angle, phasex is the line side voltage angle, phaseΔ is the lead angle. In the frequency difference grid-connected mode, the lead angle generally needs to be calculated according to the frequency change, and Δphaseset is the angle difference constant.

[0131] Specifically, in the above embodiment, the calculation of the lead angle needs to take into account the influence of the frequency difference and the slip. The calculation process can be as follows: Fig.19 As shown, a first angle value caused by the frequency difference angle on both sides of the circuit breaker and a second angle value caused by the slip angle on both sides are calculated respectively, and the sum of the first angle value and the second angle can be used as the leading angle, wherein the slip can be the difference between the frequency change rates on both sides of the circuit breaker.

[0132] Embodiment 6

[0133] Fig. 20 is a structural schematic diagram of a closing control device provided according to Embodiment 6 of the present invention, see Fig. 20 , the device is applied to the integrated protection and measurement device, the closing control device includes:

[0134] The data acquisition module 510 is used to obtain the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device in response to the closing command.

[0135] The state determination module 520 is used to match the amplitude and frequency requirements of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes the closing state of no-voltage detection, the closing state of same frequency detection and the closing state of differential frequency detection.

[0136] The closing execution module 530 is used to search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing according to the operation control program.

[0137] In the embodiment of the present invention, when a closing command is obtained by a data acquisition module, the voltage amplitude and voltage frequency of the bus side and the line side of the line protection measurement and control device are obtained. The state determination module matches the voltage amplitude and voltage frequency of the bus side and the line side with the amplitude and frequency requirements of the preset closing state respectively, and uses the matched preset closing state as the target closing state of the line protection measurement and control device. The preset closing state includes a closing state for detecting no-voltage, a closing state for detecting same frequency, and a closing state for detecting differential frequency. The closing execution module searches for the corresponding operation control in the program file of the line protection measurement and control device through the target closing state. The control program is used to perform closing control according to the operation control program, and the closing state of the line protection and measurement and control device can be accurately judged by the voltage amplitude and voltage frequency on the bus side and the line side of the line protection and measurement and control device, so as to realize automatic judgment of the closing state of the line protection and measurement and control device, reduce the judgment error of the closing state, realize closing operation based on the operation program corresponding to the closing state, improve the normalization degree of closing operation, improve the accuracy of closing control, reduce the impact current generated by the closing operation, thereby reduce the oscillation and impact of the impact current on the power grid, and improve the stability of power grid operation.

[0138] In some embodiments of the invention, it also includes: an initial state module, which is used to obtain the working state information of the line protection and measurement and control device, the working state information includes the opening and closing state of the relay of the line protection and measurement and control device and the current value of the load current information; if the working state information meets the initial execution conditions of the operation control program, respond to the closing command; if the working state information does not meet the initial execution conditions of the operation control program, re-acquire the working state information until the newly acquired working state information meets the initial execution conditions; wherein the initial execution conditions include that the opening and closing state is a closed state and the current value of the load current information is greater than the current threshold.

[0139] In some embodiments of the invention, the state determination module 520 is specifically used to: if the voltage amplitude on the bus side and the voltage amplitude on the line side match the first amplitude frequency requirement of the voltage-free closing state, then set the target closing state to the voltage-free closing state, wherein the first amplitude frequency requirement includes: at least one of the voltage amplitude on the bus side and the voltage amplitude on the line side is less than the first voltage threshold;

[0140] If the voltage amplitude and voltage frequency on the bus side, as well as the voltage amplitude and voltage frequency on the line side, match the second amplitude-frequency requirement of the same-frequency detection closing state, the target closing state is set to the same-frequency detection closing state, wherein the second amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is less than the first frequency difference threshold;

[0141] If the voltage amplitude and voltage frequency on the bus side, as well as the voltage amplitude and voltage frequency on the line side, match the third amplitude-frequency requirement of the differential frequency closing state, the target closing state is set to the differential frequency closing state, wherein the third amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is not less than the first frequency difference threshold.

[0142] In some embodiments of the invention, the closing execution module 530 is specifically used to:

[0143] The real-time data unit is used to obtain the voltage amplitude, voltage frequency and voltage phase angle of the bus side at the current moment as the real-time status information of the bus side, and to obtain the voltage amplitude, voltage frequency and voltage phase angle of the line side at the current moment as the real-time status information of the line side.

[0144] The grid-connected condition query unit is used to query the grid-connected condition stored in association with the target closing state in the program file of the line protection measurement and control device.

[0145] A condition trigger unit, for executing the operation control program of the target closing state if the real-time state information of the bus side and the real-time state information of the line side meet the grid connection condition, otherwise, re-acquiring the real-time state information of the bus side and the real-time state information of the line side at the current moment until the operation control program of the target closing state is executed;

[0146] The grid connection condition includes at least one of the following: when the target closing state includes the no-voltage closing state, at least one of the voltage amplitude in the real-time state information on the bus side and the voltage amplitude in the real-time state information on the line side is less than a second voltage threshold;

[0147] When the target closing state includes the same-frequency closing state, the voltage difference between the line voltage amplitude of the bus side real-time state information and the line side real-time state information is less than the first voltage difference threshold, the phase angle difference between the voltage phase angle of the bus side real-time state information and the line side real-time state information is less than the first angle difference constant, and the frequency difference between the voltage frequency of the bus side real-time state information and the line side real-time state information is less than the second frequency difference threshold;

[0148] When the target closing state includes the differential frequency closing state, the voltage difference between the voltage amplitude of the real-time status information on the bus side and the real-time status information on the line side is less than the third voltage difference threshold, the phase difference between the voltage phase angle of the real-time status information on the bus side and the real-time status information on the line side is less than the third angle difference constant, and the frequency difference between the voltage frequency of the real-time status information on the bus side and the real-time status information on the line side is less than the third frequency difference threshold.

[0149] On the basis of the above-mentioned embodiments of the invention, the real-time data unit is specifically used for: respectively collecting the voltage amplitude, voltage frequency and voltage phase angle of the bus side of at least one cycle as the bus side sampling status information, and the voltage amplitude, voltage frequency and voltage phase angle of the line side as the line side sampling status information, and recording the time of collecting the voltage amplitude on the bus side as the bus side sampling moment; determining the frequency ratio of the voltage frequency on the line side and the voltage frequency on the bus side; determining the time interval between two adjacent bus side sampling moments, and taking the product of the frequency ratio and the time interval as the line side sampling time interval; taking the bus side sampling status information as the bus side real-time status information, and interpolating the line side sampling status information through the line side sampling time interval to obtain the line side real-time status information.

[0150] On the basis of the above-mentioned embodiments of the invention, the line side sampling state information is interpolated according to the line side sampling time interval to obtain the line side real-time state information, including:

[0151] Performing Lagrange interpolation processing on the line side sampling state information at the line side sampling time interval to obtain initial line side sampling state information;

[0152] Determine that the initial line side sampling state information has an information interpolation position processed by Lagrangian interpolation at twice the line side sampling time interval, and perform Lagrangian interpolation on the initial line side sampling state information at twice the line side sampling time interval;

[0153] When the initial line-side sampling status information and the bus-side sampling status information meet the synchronization condition, the initial line-side sampling status information is used as the line-side real-time status information.

[0154] On the basis of the above-mentioned embodiments of the invention, it also includes: an identification setting module, which is used to count the execution time of the operation control program; if the execution time of the operation control program is less than or equal to the grid-connected delay of the target closing state, then the grid-connected success identification of the target closing state is set in the storage space of the line protection measurement and control device; otherwise, the grid-connected failure identification of the target closing state is set in the storage space of the line protection measurement and control device.

[0155] Embodiment 7

[0156] Fig.21: is a schematic diagram of the structure of an electronic device for implementing the closing control method of an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0157] like Fig.21 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0158] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0159] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a closing control method.

[0160] In some embodiments, the closing control method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the closing control method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the closing control method in any other appropriate manner (e.g., by means of firmware).

[0161] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0162] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0163] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0164] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0165] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0166] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0167] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0168] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A closing control method, characterized in that: Applied to a line protection measurement and control device, the method comprises: In response to a closing command, obtaining voltage amplitudes and voltage frequencies on the bus side and the line side of the line protection and measurement and control device; According to the voltage amplitude and the voltage frequency, the amplitude frequency requirements of the preset closing state are matched to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes a closing state for detecting no voltage, a closing state for detecting same frequency, and a closing state for detecting differential frequency; The operation control program of the target closing state is searched in the program file of the line protection measurement and control device, and the closing state is controlled according to the operation control program.

2. The method according to claim 1, characterized in that: Before responding to the closing command, the method further comprises: Acquire the working state information of the line protection measurement and control device, wherein the working state information includes the opening and closing state of the relay in the line protection measurement and control device and the current value of the load current information; If the working status information satisfies the initial execution condition of the operation control program, responding to the closing command; If the working state information does not satisfy the initial execution condition of the operation control program, reacquire the working state information until the newly acquired working state information satisfies the initial execution condition; The initial execution condition includes that the opening and closing state is a closed state and the current value of the load current information is greater than a current threshold.

3. The method according to claim 1, characterized in that: The matching of the amplitude-frequency requirement of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device includes: If the voltage amplitude on the bus side and the voltage amplitude on the line side match the first amplitude frequency requirement of the voltage-free closing state, the target closing state is set to the voltage-free closing state, wherein the first amplitude frequency requirement includes: at least one of the voltage amplitude on the bus side and the voltage amplitude on the line side is less than a first voltage threshold; If the voltage amplitude and the voltage frequency on the bus side, and the voltage amplitude and the voltage frequency on the line side, match the second amplitude-frequency requirement of the same-frequency detection closing state, the target closing state is set to the same-frequency detection closing state, wherein the second amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than a first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is less than a first frequency difference threshold; If the voltage amplitude and the voltage frequency on the bus side, as well as the voltage amplitude and the voltage frequency on the line side, match the third amplitude-frequency requirement of the differential frequency closing state, the target closing state is set to the differential frequency closing state, wherein the third amplitude-frequency requirement includes: the voltage amplitude on the bus side and the voltage amplitude on the line side are not less than the first voltage threshold, and the frequency difference between the frequency on the bus side and the frequency on the line side is not less than the first frequency difference threshold.

4. The method according to claim 1, characterized in that: The step of searching the program file of the line protection measurement and control device for the target closing state for the operation control program, and controlling the closing state according to the operation control program, comprises: The voltage amplitude, voltage frequency and voltage phase angle of the bus side at the current moment are used as the real-time status information of the bus side, and the voltage amplitude, voltage frequency and voltage phase angle of the line side at the current moment are used as the real-time status information of the line side; Querying the grid connection condition stored in association with the target closing state in the program file of the line protection measurement and control device; If the bus side real-time status information and the line side real-time status information meet the grid connection condition, the operation control program of the target closing state is executed; otherwise, the bus side real-time status information and the line side real-time status information at the current moment are re-acquired until the operation control program of the target closing state is executed; The grid connection conditions include at least one of the following: When the target closing state includes a no-voltage closing state, at least one of the voltage amplitude in the bus side real-time state information and the voltage amplitude in the line side real-time state information is less than a second voltage threshold; When the target closing state includes the same-frequency closing state, the voltage difference between the line voltage amplitude of the bus side real-time state information and the line side real-time state information is less than a first voltage difference threshold, the phase angle difference between the voltage phase angle of the bus side real-time state information and the line side real-time state information is less than a first angle difference constant, and the frequency difference between the voltage frequency of the bus side real-time state information and the line side real-time state information is less than a second frequency difference threshold; When the target closing state includes a differential frequency closing state, the voltage difference between the voltage amplitude of the bus side real-time status information and the line side real-time status information is less than a third voltage difference threshold, the phase difference between the voltage phase angle of the bus side real-time status information and the line side real-time status information is less than a third angle difference constant, and the frequency difference between the voltage frequency of the bus side real-time status information and the line side real-time status information is less than a third frequency difference threshold.

5. The method according to claim 4, characterized in that: The step of obtaining the voltage amplitude, voltage frequency and voltage phase angle of the bus side at the current moment as the real-time status information of the bus side, and obtaining the voltage amplitude, voltage frequency and voltage phase angle of the line side at the current moment as the real-time status information of the line side, includes: The voltage amplitude, voltage frequency and voltage phase angle of the bus side of at least one cycle are respectively collected as bus side sampling state information, and the voltage amplitude, voltage frequency and voltage phase angle of the line side are collected as line side sampling state information, and the time of collecting the voltage amplitude of the bus side is recorded as the bus side sampling time; Determining a frequency ratio of the voltage frequency on the line side and the voltage frequency on the bus side; Determine the time interval between two adjacent bus side sampling moments, and use the product of the frequency ratio and the time interval as the line side sampling time interval; The bus side sampling state information is used as the bus side real-time state information, and the line side sampling state information is interpolated according to the line side sampling time interval to obtain the line side real-time state information.

6. The method according to claim 5, characterized in that: The interpolation processing of the line side sampling state information according to the line side sampling time interval to obtain the line side real-time state information includes: Performing Lagrangian interpolation processing on the line side sampling state information at the line side sampling time interval to obtain initial line side sampling state information; Determine that the initial line side sampling state information has an information interpolation position that is processed by Lagrangian interpolation at twice the line side sampling time interval, and perform Lagrangian interpolation processing on the initial line side sampling state information at twice the line side sampling time interval; The initial line-side sampling state information is used as the line-side real-time state information.

7. The method according to claim 1, characterized in that: After controlling the closing of the circuit breaker according to the operation control program, the method further comprises: Counting the execution time of the operation control program; If the execution time of the operation control program is less than or equal to the grid-connected delay of the target closing state, the grid-connected success flag of the target closing state is set in the storage space of the line protection and measurement and control device; otherwise, the grid-connected failure flag of the target closing state is set in the storage space of the line protection and measurement and control device.

8. A closing control device, characterized in that: Applicable to a line protection measurement and control device, the device comprising: A data acquisition module, used for acquiring the voltage amplitude and voltage frequency on the bus side and the line side of the line protection measurement and control device in response to a closing command; A state determination module is used to match the amplitude frequency requirements of the preset closing state according to the voltage amplitude and the voltage frequency to obtain the target closing state of the line protection measurement and control device, wherein the preset closing state includes a no-voltage closing state, a same-frequency closing state and a differential-frequency closing state; The closing execution module is used to search the program file of the line protection measurement and control device for the operation control program of the target closing state, and control the closing state according to the operation control program.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the closing control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the closing control method according to any one of claims 1 to 7 when executed.

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