A power quality intelligent monitoring system and method

Abstract

The present invention relates to the technical field of power quality monitoring, and discloses an intelligent power quality monitoring system and method, including a shell and a filter plate, the top and bottom of the filter plate are fixedly connected with connection blocks, the left and right sides of the inner wall of the shell are fixedly connected with mounting plates, the front of the shell is hinged with a shell cover, the left side of the shell is fixedly connected with a mounting mechanism, the mounting mechanism is provided with a reinforcement mechanism, the mounting plate is provided with a monitoring mechanism, the mounting mechanism includes a rectangular groove, the rectangular groove is opened on the left side of the shell, the left side of the rectangular groove is set as an opening, the top and bottom of the shell are fixedly connected with a motor, the side of the motor close to the shell is fixedly connected with a threaded rod, and the surface of the threaded rod is rotatably connected to the inside of the rectangular groove. The intelligent power quality monitoring system and method, by providing a mounting mechanism, can enable the filter plate to be installed on the left side of the shell when the mounting mechanism is running, which can improve work efficiency to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of power quality monitoring, and in particular to an intelligent power quality monitoring system and method. Background Art

[0002] Power quality monitoring is a task of power grid monitoring that characterizes the basic operating conditions of the power grid based on the collected real-time monitoring data, and then used to analyze the problems existing in the power consumption of users, and to provide assistance for the rapid maintenance of the power grid and the restoration of power supply failures. With the rapid development of new energy power stations such as wind power and solar power, the grid connection rate of these electric energies, which are greatly affected by natural factors and have low stability, has also been increasing. This has improved the cleanliness of the power grid, but it has also caused large fluctuations in the power quality of the power grid. Therefore, power quality monitoring of the power grid has become particularly important. The power quality function of the existing power grid is mainly implemented by special power monitoring equipment; the installation and application costs of these devices are relatively high.

[0003] The quality monitoring of electric energy still relies on the operation and maintenance personnel to regularly inspect the relevant nodes, find problems in time and collect terminal data and upload them to the system. This makes the power quality detection of the power grid time-consuming and labor-intensive, with low efficiency. At the same time, the filter plate installed on one side is directly connected by welding, which is inconvenient to replace. Summary of the invention

[0004] The purpose of the present invention is to provide a power quality intelligent monitoring system and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent power quality monitoring system, comprising a shell and a filter plate, the top and bottom of the filter plate are fixedly connected with connecting blocks, the left and right sides of the inner wall of the shell are fixedly connected with mounting plates, the front of the shell is hinged with a shell cover, the left side of the shell is fixedly connected with a mounting mechanism, the mounting mechanism is provided with a reinforcement mechanism, and the mounting plate is provided with a monitoring mechanism.

[0006] The mounting mechanism includes a rectangular groove, which is opened on the left side of the shell, and the left side of the rectangular groove is set as an opening. The top and bottom of the shell are fixedly connected to the motor, and the motor is fixedly connected to a threaded rod on the side close to the shell. The surface of the threaded rod is rotatably connected to the inside of the rectangular groove. A sliding groove is opened on the back side of the inner wall of the rectangular groove, and a connecting seat is threadedly connected to the surface of the threaded rod. A slider is fixedly connected to the back side of the right side of the connecting seat, and the surface of the slider is slidably connected to the inside of the sliding groove. A plug plate is fixedly connected to the side of the connecting seat close to the connecting block. When the threaded rod rotates and the connecting seat moves on the threaded rod, the connecting seat drives the slider to slide in the sliding groove on the one hand, and drives the plug plate to be plugged into the square groove on the other hand.

[0007] Preferably, a through groove is provided inside the rectangular groove, and the surface of the inserting plate passes through the through groove provided inside the rectangular groove.

[0008] Preferably, the reinforcement mechanism includes a square groove, and one side of the square groove corresponding to the plug plate is set to an opening, the surface of the square groove is plugged into the inside of the plug plate, a slot is opened inside the plug plate, and the left side of the slot is set to an opening, a long plate is plugged into the slot, a hinged plate is fixedly connected to the left side of the long plate, a locking plate is hinged to the right side of the hinged plate, a torsion spring is hinged between the hinge plate and the locking plate, a card slot is fixedly connected to the right side of the hinged plate, a card block is opened on the left side of the connecting block, and the left side of the card block is set to an opening, the inside of the card block and the surface of the card slot are plugged, and when the card block is plugged into the card slot, the long plate can be plugged into the slot, so that the filter plate can be installed on the left side inside the shell.

[0009] Preferably, the connection block and the square groove are both provided with long grooves, and the surface of the long plate passes through the long grooves provided in the connection block and the square groove.

[0010] Preferably, the monitoring mechanism includes a display screen, which is fixedly connected to the front side of the shell cover, a sensor is fixedly connected to the top of the mounting plate, the sensor and the display screen are electrically connected, an information storage device is fixedly connected to the bottom of the inner wall of the shell, the top of the information storage device and the bottom of the sensor are electrically connected, a sensing probe is fixedly connected to the right side of the sensor, a through hole is opened on the right side of the shell, and the surface of the sensing probe passes through the through hole opened on the right side of the shell.

[0011] A method for intelligent monitoring of power quality includes the following steps.

[0012] S1. Continuous monitoring

[0013] Continuously monitor the power quality of public power supply points in important substations. The main technical indicators monitored are: power supply frequency, voltage deviation, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, and power factor;

[0014] S2. Regular patrol inspection

[0015] It is mainly suitable for the detection method used when the power supply quality needs to be mastered but continuous detection is not required or the conditions for continuous detection are not met. The power supply quality detection of the public points of the power supply system of residents, businesses and small factories. According to the importance, it is generally sufficient to detect once a month or a quarter. The patrol detection task is mainly completed by a portable power quality analyzer or a handheld harmonic analyzer;

[0016] S3. Special testing

[0017] It is mainly used for detection before and after the interference source equipment is connected to the power grid (or capacity changes), to determine the background status of the power quality indicators of the power grid and the actual amount of interference or to verify the effect of technical measures. This monitoring task is generally completed by a portable power quality analyzer. While completing the power quality detection and monitoring, the selection of power quality monitoring points will directly affect the detection and monitoring results.

[0018] Preferably, in step S1, the control content is: the power supply frequency control has been undertaken by the power dispatching center, and the power quality control mainly refers to issuing an alarm or control instruction when indicators such as voltage deviation, three-phase voltage imbalance, and grid harmonics exceed the limit. The continuous monitoring task is mainly completed by the power quality monitor installed in the substation.

[0019] Preferably, in step S2, the voltage fluctuation and flicker indicators do not need to be continuously monitored online. If the load changes slightly within the power supply range, it is generally sufficient to detect once every six months or one year. The measurement of voltage fluctuation and flicker can be completed by a flicker meter or a portable power quality analyzer.

[0020] Preferably, in step S3, the setting of power quality monitoring points should take into account the following factors: 1. They should cover the main grid and all power supply voltage levels and be evenly distributed in the power grid (regionally and at the beginning and end of lines); 2. They should meet the requirements for adjustment and control of power quality indicators; 3. They should meet the requirements of special users and users who have signed contracts with power quality indicator terms.

[0021] Compared with the prior art, the present invention provides a system and method for intelligent monitoring of power quality, which has the following beneficial effects:

[0022] 1. The power quality intelligent monitoring system and method can install the filter plate on the left side of the shell by setting up the installation mechanism. When the installation mechanism is in operation, the working efficiency can be improved to a certain extent.

[0023] 2. The intelligent power quality monitoring system and method can further reinforce the filter plate installed in the shell by setting a reinforcement mechanism, so as to avoid the filter plate being unstable.

[0024] 3. The power quality intelligent monitoring system and method uses a high-voltage isolation module for the working voltage input and a high-precision current transformer for the current input, which optimizes the protection of the input data signal and the precise measurement system, further improving the anti-interference ability of HDDZ300B and making it easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is the front view of the overall structure of the present invention;

[0027] Figure 2 It is a front cross-sectional view of the overall structure of the present invention;

[0028] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0029] Figure 4 for Figure 2 Enlarged structural diagram at B in the middle.

[0030] In the figure: 1. shell cover; 2. monitoring mechanism; 3. shell; 4. filter plate; 5. reinforcement mechanism; 51. block; 52. hinge plate; 53. torsion spring; 54. long plate; 55. slot; 56. square slot; 57. slot; 58. locking plate; 6. mounting mechanism; 61. motor; 62. threaded rod; 63. connecting seat; 64. plug plate; 65. rectangular slot; 66. slide slot; 67. slider; 7. mounting plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention provides the following technical solutions:

[0034] Embodiment 1

[0035] Combination Figures 1 to 4 , an intelligent power quality monitoring system, including a shell 3 and a filter plate 4, the top and bottom of the filter plate 4 are fixedly connected with connecting blocks 41, the left and right sides of the inner wall of the shell 3 are fixedly connected with mounting plates 7, the front of the shell 3 is hinged with a shell cover 1, the left side of the shell 3 is fixedly connected with a mounting mechanism 6, the mounting mechanism 6 is provided with a reinforcement mechanism 5, and the mounting plate 7 is provided with a monitoring mechanism 2.

[0036] The mounting mechanism 6 includes a rectangular groove 65, which is opened on the left side of the shell 3, and the left side of the rectangular groove 65 is set as an opening. The top and bottom of the shell 3 are fixedly connected to the motor 61, and the motor 61 is fixedly connected to the side close to the shell 3. The surface of the threaded rod 62 is rotatably connected to the inside of the rectangular groove 65. A sliding groove 66 is opened on the back of the inner wall of the rectangular groove 65, and a connecting seat 63 is threadedly connected on the surface of the threaded rod 62. A slider 67 is fixedly connected to the back of the right side of the connecting seat 63, and the surface of the slider 67 is slidably connected to the inside of the sliding groove 66. A plug plate 64 is fixedly connected to the side of the connecting seat 63 close to the connecting block 41. A through groove is opened in the rectangular groove 65, and the surface of the plug plate 64 runs through the through groove opened in the rectangular groove 65. The reinforcement mechanism 5 includes a square groove 56, and the side of the square groove 56 corresponding to the plug plate 64 is set as an opening. The surface of the square groove 56 is plugged into the inside of the plug plate 64, and a slot 55 is opened in the plug plate 64. The left side of the slot 55 is set An opening, a long plate 54 is inserted into the slot 55, a hinged plate 52 is fixedly connected to the left side of the long plate 54, a locking plate 58 is hinged to the right side of the hinged plate 52, a torsion spring 53 is hinged between the hinged plate 52 and the locking plate 58, a card slot 57 is fixedly connected to the right side of the hinged plate 52, a card block 51 is opened on the left side of the connecting block 41, the left side of the card block 51 is set as an opening, the inside of the card block 51 and the surface of the card slot 57 are carded, the connecting block 41 and the square slot 56 are both provided with long grooves, the surface of the long plate 54 runs through the long grooves opened in the connecting block 41 and the square slot 56, the monitoring mechanism 2 includes a display screen 24, the display screen 24 is fixedly connected to the front side of the shell cover 1, the top of the mounting plate 7 is fixedly connected to the sensor 22, the sensor 22 and the display screen 24 are connected by telecommunication, the bottom of the inner wall of the shell 3 is fixedly connected to the information storage 21, the top of the information storage 21 and the bottom of the sensor 22 are connected by telecommunication, and the right side of the sensor 22 is fixedly connected to the sensing probe 23.

[0037] Furthermore, a through hole is opened on the right side inside the shell 3, and the surface of the sensing probe 23 passes through the through hole opened on the right side inside the shell 3. When the installation mechanism 6 is operated, the filter plate 4 can be installed on the left side inside the shell 3, which can improve the work efficiency to a certain extent. With the installation mechanism 6, after the filter plate 4 is installed in the shell 3, the filter plate 4 can be further reinforced to avoid the filter plate 4 being loose.

[0038] Embodiment 2

[0039] A method for intelligent monitoring of power quality:

[0040] S1. Continuous monitoring

[0041] Continuously monitor the power quality of public power supply points in important substations. The main technical indicators monitored are: power supply frequency, voltage deviation, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, and power factor;

[0042] S2. Regular patrol inspection

[0043] It is mainly suitable for the detection method used when the power supply quality needs to be mastered but continuous detection is not required or the conditions for continuous detection are not met. The power supply quality detection of the public points of the power supply system of residents, businesses and small factories. According to the importance, it is generally sufficient to detect once a month or a quarter. The patrol detection task is mainly completed by a portable power quality analyzer or a handheld harmonic analyzer;

[0044] S3. Special testing

[0045] It is mainly used for detection before and after the interference source equipment is connected to the power grid (or capacity changes), to determine the background status of the power quality indicators of the power grid and the actual amount of interference or to verify the effect of technical measures. This monitoring task is generally completed by a portable power quality analyzer. While completing the power quality detection and monitoring, the selection of power quality monitoring points will be directly related to the detection and monitoring results.

[0046] Embodiment 3

[0047] A method for intelligent monitoring of power quality:

[0048] S1. Continuous monitoring

[0049] The power quality of the public power supply points of important substations is continuously monitored. The main technical indicators monitored are: power supply frequency, voltage deviation, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, power factor, and control content: power supply frequency control has been undertaken by the power dispatching center. Power quality control mainly refers to the issuance of alarms or control instructions when indicators such as voltage deviation, three-phase voltage imbalance, and grid harmonics exceed the limit. The continuous monitoring task is mainly completed by the power quality monitor installed in the substation.

[0050] S2. Regular patrol inspection

[0051] It is mainly suitable for the detection method adopted when the power supply quality needs to be mastered but continuous detection is not required or the conditions for continuous detection are not met. Power supply quality detection of public points of residential, commercial and small factory power supply systems. According to the importance, it is generally sufficient to detect once a month or a quarter. The patrol detection task is mainly completed by a portable power quality analyzer or a handheld harmonic analyzer. Voltage fluctuation and flicker indicators do not need to be continuously monitored online. If the load does not change much within the power supply range, it is generally sufficient to detect once every six months or a year. The measurement of voltage fluctuation and flicker can be completed by a flicker meter or a portable power quality analyzer.

[0052] S3. Special testing

[0053] It is mainly applicable to the detection method before and after the interference source equipment is connected to the power grid (or capacity changes), to determine the background status of the power quality indicators of the power grid and the actual amount of interference or to verify the effectiveness of technical measures. This monitoring task is generally completed by a portable power quality analyzer. While completing the power quality detection and monitoring, the selection of power quality monitoring points will be directly related to the detection and monitoring results. The setting of power quality monitoring points should take into account the following factors: 1. It should cover the main grid and all power supply voltage levels, and be evenly distributed in the power grid (regional and line ends); 2. Meet the requirements for adjustment and control of power quality indicators; 3. Meet the requirements of special users and users who have signed contracts with power quality indicator terms.

[0054] Furthermore, the working voltage input uses a high-voltage isolation module, and the current input uses a high-precision current transformer to optimize the protection of the input data signal and the precision measurement system, further improving the anti-interference ability of the HDDZ300B and making it easy to use.

[0055] In actual operation, when the device is used, the filter plate 4 is replaced again by toggling the locking plate 58. The locking plate 58 and the hinged plate 52 are in a straight line when hinged. At this time, the locking plate 58 drives the card block 51 to be taken out of the card slot 57, and the long plate 54 is pulled, and the long plate 54 is moved out of the slot 55. At this time, the motor 61 is started again. When the motor 61 drives the threaded rod 62 to rotate, the connecting seat 63 moves on the threaded rod 62. At this time, when the connecting seat 63 drives the slider 67 to slide in the slide groove 66, the connecting seat 63 drives the plug plate 64 to move out of the square groove 56. When installing the new filter plate 4, the above steps can be reversed.

[0056] When people need to detect the power quality, the sensing probe 23 senses the power of the cable. On the one hand, the sensed data can be transmitted to the display screen 24 via telecommunications, and on the other hand, the sensor 22 transmits it to the information storage device 21 via telecommunications for storage, thereby completing the detection of the power quality.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. An intelligent power quality monitoring system, comprising a housing (3) and a filter plate (4), characterized in that: The top and bottom of the filter plate (4) are both fixedly connected to connection blocks (41); the left and right sides of the inner wall of the shell (3) are both fixedly connected to mounting plates (7); the front of the shell (3) is hingedly connected to a shell cover (1); the left side of the inside of the shell (3) is fixedly connected to a mounting mechanism (6); a reinforcement mechanism (5) is provided on the mounting mechanism (6); and a monitoring mechanism (2) is provided on the mounting plate (7); The mounting mechanism (6) comprises a rectangular groove (65), the rectangular groove (65) being provided on the left side inside the shell (3), the left side of the rectangular groove (65) being arranged as an opening, the top and bottom of the shell (3) being fixedly connected to a motor (61), the motor (61) being fixedly connected to a threaded rod (62) on a side close to the shell (3), the surface of the threaded rod (62) being rotatably connected to the inside of the rectangular groove (65), a sliding groove (66) being provided on the back side of the inner wall of the rectangular groove (65), the surface of the threaded rod (62) being threadably connected to a connecting seat (63), the right side back side of the connecting seat (63) being fixedly connected to a sliding block (67), the surface of the sliding block (67) being slidably connected to the inside of the sliding groove (66), and the connecting seat (63) being fixedly connected to a plug plate (64) on a side close to the connecting block (41); The reinforcing mechanism (5) comprises a square groove (56), wherein one side of the square groove (56) corresponding to the plug plate (64) is arranged as an opening, the surface of the square groove (56) is plugged into the inside of the plug plate (64), a slot (55) is provided inside the plug plate (64), the left side of the slot (55) is arranged as an opening, a long plate (54) is plugged into the inside of the slot (55), a hinge plate (52) is fixedly connected to the left side of the long plate (54), a locking plate (58) is hingedly connected to the right side of the hinge plate (52), a torsion spring (53) is hingedly connected between the hinge plate (52) and the locking plate (58), a clamping slot (57) is fixedly connected to the right side of the hinge plate (52), a clamping block (51) is provided inside the left side of the connecting block (41), the left side of the clamping block (51) is arranged as an opening, and the inside of the clamping block (51) is clamped into the surface of the clamping slot (57); The monitoring mechanism (2) comprises a display screen (24), the display screen (24) being fixedly connected to the front side of the shell cover (1), a sensor (22) being fixedly connected to the top of the mounting plate (7), the sensor (22) and the display screen (24) being electrically connected, an information storage device (21) being fixedly connected to the bottom of the inner wall of the shell (3), the top of the information storage device (21) and the bottom of the sensor (22) being electrically connected, a sensing probe (23) being fixedly connected to the right side of the sensor (22), a through hole being opened on the right side of the interior of the shell (3), and a surface of the sensing probe (23) passing through the through hole opened on the right side of the interior of the shell (3).

2. The power quality intelligent monitoring system according to claim 1, characterized in that: A through slot is provided inside the rectangular slot (65), and the surface of the insert plate (64) passes through the through slot provided inside the rectangular slot (65).

3. The intelligent power quality monitoring system according to claim 1, characterized in that: The connection block (41) and the square groove (56) are both provided with long grooves, and the surface of the long plate (54) passes through the long grooves provided in the connection block (41) and the square groove (56).

4. A method for intelligent monitoring of power quality, applied to the intelligent monitoring system for power quality as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Continuous monitoring Continuously monitor the power quality of public power supply points in important substations. The main technical indicators monitored are: power supply frequency, voltage deviation, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, and power factor; S2. Regular patrol inspection It is mainly suitable for the detection method adopted when the power supply quality needs to be mastered but continuous detection is not required or the conditions for continuous detection are not met. The power supply quality detection of the public points of the power supply system of residents, businesses and small factories can be detected once a month or a quarter according to the importance. The patrol detection task is mainly completed by a portable power quality analyzer or a handheld harmonic analyzer. S3. Special testing It is mainly suitable for the detection method before and after the interference source equipment is connected to the power grid, to determine the background status of the power quality indicators of the power grid and the actual amount of interference or to verify the effectiveness of technical measures. This monitoring task is completed by a portable power quality analyzer. While completing the power quality detection and monitoring, the selection of power quality monitoring points will be directly related to the detection and monitoring results.

5. The method for intelligent monitoring of power quality according to claim 4, characterized in that: In step S1, the control content is as follows: the power supply frequency control has been undertaken by the power dispatching center, the power quality control mainly refers to the issuance of alarms or control instructions when the voltage deviation, three-phase voltage imbalance, and grid harmonics exceed the limit, and the continuous monitoring task is mainly completed by the power quality monitor installed in the substation.

6. The method for intelligent monitoring of power quality according to claim 4, characterized in that: In step S2, the voltage fluctuation and flicker indicators do not need to be continuously monitored online. If the load does not change much within the power supply range, it is sufficient to detect once every six months or a year. The measurement of voltage fluctuation and flicker is completed by a flicker meter or a portable power quality analyzer.

7. The method for intelligent monitoring of power quality according to claim 4, characterized in that: In step S3, the setting of power quality monitoring points should take into account the following factors:

1. They should cover the main grid and all power supply voltage levels and be evenly distributed in the power grid; 2. They should meet the requirements for adjustment and control of power quality indicators; 3. They should meet the requirements of special users and users who have signed contracts with power quality indicator terms.

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