A passive power filter for a power grid power quality active defense system

Abstract

The application relates to the technical field of power grid electric energy, in particular to a passive power filter for a power grid electric energy quality active defense system, which comprises an outer box body, a filter unit and a bottom control frame are arranged in the outer box body, the bottom control frame is connected below the filter unit, the bottom control frame comprises a bracket, a walking frame, a heat conduction plate and a thermal control device, the bracket is fixed on the inner wall of the outer box body, the walking frame is connected above the bracket, and the heat conduction plate is fixed above the walking frame, the design of the bottom control frame realizes the multi-control effect on the filter unit, the filter unit can be conveniently disassembled and assembled on the outer box body, and the quality of power maintenance work is improved; in addition, a mechanical temperature control real-time monitoring device is arranged in the walking frame, compared with the temperature monitoring of electronic instruments in the traditional technology, the mechanical temperature control device can directly reduce the economic investment cost in the power grid electric energy by replacing the electronic instruments.

Description

Technical Field

[0001] This invention relates to the field of power grid technology, specifically to a passive power filter for an active power quality defense system for power grids. Background Technology

[0002] With the rapid economic development of large cities, the load structure of power grids has undergone significant changes. On the one hand, the widespread application of power electronics technology has led to a continuous increase in the proportion of nonlinear load users in the power grid, such as DC transmission, frequency converters, and electrified railways. These nonlinear loads cause voltage and current waveform distortion, resulting in a decline in power quality and seriously affecting the safe and stable operation of the system. On the other hand, with the upgrading of urban industries, the proportion of high-tech, high-value-added manufacturing enterprises such as automobile assembly, microelectronics, and large-scale high-speed data servers in the total industrial output value will continue to grow. These high-tech enterprises place very high demands on power supply quality.

[0003] Existing active power quality defense systems for power grids involve the use of passive power filters. Traditional passive power filters control the entire active power quality defense system by setting up several filter units in the power box. Improving the design of passive power filters to enhance their ease of use and safety is of great significance, enabling them to operate safely and stably in the power grid defense system. Therefore, the passive power filter we provide features convenient disassembly and high-temperature monitoring, allowing it to play a safe and reliable role in the power grid defense system. Summary of the Invention

[0004] The purpose of this invention is to provide a passive power filter for an active power quality defense system for power grids, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a passive power filter for an active power quality defense system for power grids, comprising an outer casing, a filter unit and a bottom control frame disposed within the outer casing, the bottom control frame being connected below the filter unit, the bottom control frame comprising a bracket, a traveling frame, a heat-conducting plate and a heat control component, the bracket being fixed to the inner wall of the outer casing, the traveling frame being connected above the bracket, the heat-conducting plate being fixed above the traveling frame and fixed to the bottom of the filter unit, one end of the traveling frame being connected to a heat control component, and the upper end of the heat control component being connected to the heat-conducting plate, the traveling frame comprising a first crossbar, roller components and a first longitudinal bar, both ends of the first crossbar being fixedly connected to the first longitudinal bar, a plurality of evenly distributed roller components being drivenly connected to the first longitudinal bar, the upper ends of the roller components being connected to the filter unit, and the lower ends of the roller components contacting the bracket.

[0006] Preferably, the bracket includes a directional concave rail, an arc-shaped plate, a brake lever bracket, a second longitudinal rod, a lifting rod, a limiting device, and a second crossbar. Two parallel directional concave rails are arranged below the filter unit. A second longitudinal rod is parallel to one side of each directional concave rail, and a brake lever bracket is parallel to the other side. The lower end of the roller extends into the directional concave rail. A lifting rod is fixedly connected between the two directional concave rails. A second crossbar is fixedly connected between the two second longitudinal rods. An arc-shaped plate is fixedly connected between the two brake lever brackets. Several evenly distributed limiting devices are provided on the directional concave rail.

[0007] Preferably, the thermal control device includes a Z-shaped brake plate, a conical body, and a limiting seat. The Z-shaped brake plate passes through a square hole in the heat-conducting plate. One end of the Z-shaped brake plate contacts a plurality of evenly distributed conical bodies. A limiting seat is provided between the conical bodies and the heat-conducting plate. The limiting seat is shaped like a trapezoidal cylinder with a plurality of evenly distributed L-shaped plates fixed on its outer wall. The limiting seat is fixed above the heat-conducting plate. The other end of the Z-shaped brake plate contacts the first crossbar.

[0008] Preferably, the second longitudinal rod includes a side control rod and a limiting block. The limiting block is fixed on the directional concave rail and has a square hole. The side control rod passes through the square hole of the limiting block, and one end of the side control rod is fixed to the second crossbar. The side control rod is prismatic in shape and has several arc-shaped protruding sections on its body. The arc-shaped protruding sections on the side control rod contact the limiting device. The brake lever bracket includes an L-shaped insert rod, a first spring, an L-shaped directional plate, an inner rod, and a brake lever. One end of the brake lever is fixed to the arc-shaped plate. A number of evenly distributed L-shaped inserts are fixedly connected to one side of the rod. One end of the L-shaped insert extends into the limiting device, and the other end of the L-shaped insert is fixedly connected to an inner rod. An L-shaped directional plate is provided on one side of the L-shaped insert and is fixed on the directional concave rail. A through hole is opened on the L-shaped directional plate, and the inner rod is movably sleeved in the through hole of the L-shaped directional plate. A first spring is placed between the L-shaped directional plate and the L-shaped insert. The first spring is sleeved on the inner rod, and one side plane of the brake lever is in contact with one side plane of the L-shaped directional plate.

[0009] Preferably, the roller component includes an L-shaped short plate, a contact element, a conductive cylinder, and a metal wheel. The L-shaped short plate is fixed to the bottom of the filter unit. One end of the L-shaped short plate has a through hole, and a conductive cylinder is movably sleeved in the through hole. One end of the conductive cylinder is fixedly connected to the metal wheel, and part of the metal wheel extends into the directional concave rail. The conductive cylinder passes through the middle of the metal wheel. Limiting sleeves are fixed on the conductive cylinders on both sides of the L-shaped short plate. The other end of the conductive cylinder contacts the contact element, and one end of the contact element extends into the filter unit. A prism hole is opened on the L-shaped short plate, and a first longitudinal rod is movably sleeved in the prism hole.

[0010] Preferably, the limiting device includes an L-shaped piece, a second spring, a locking body, a side control piece, and a lifting block. One end of the L-shaped piece is fixed to the directional groove. A through hole is opened on the L-shaped piece, and a locking body is movably sleeved in the through hole. The locking body is cylindrical with one end integrally connected to a hemisphere. A second spring is movably sleeved on the locking body and the cylinder. The second spring is placed between the locking body and the L-shaped piece. One side of the locking body contacts the side control piece. One end of the side control piece is fixedly connected to the lifting block, which passes through the directional groove.

[0011] Preferably, the directional concave rail is a concave long rail, and several evenly distributed semi-circular curved sections are provided in the rail. A square hole is opened in the middle of the semi-circular curved section of the directional concave rail, and a lifting block is movably sleeved in the square hole. One end of the L-shaped insert extends into the square groove opened on the lifting block. The side control plate is an L-shaped plate with one end integrally connected to an arc plate. The arc plate on the side control plate contacts the hemisphere on the locking body.

[0012] Preferably, the contact element includes a metal pillar, a horizontal push plate, an L-shaped guide pillar, an intercepting horizontal plate, a fourth spring, and a metal top plate. The upper end of the metal pillar extends into the filter unit, and the lower end of the metal pillar is fixedly connected to the metal top plate. The lower end of the metal top plate rests on the conductive cylinder, and the upper end of the metal top plate contacts the fourth spring. The upper end of the fourth spring contacts the intercepting horizontal plate, and one end of the intercepting horizontal plate is fixedly connected to an L-shaped short plate. A through hole is opened on the intercepting horizontal plate, and the metal pillar is movably sleeved in the through hole. The fourth spring is sleeved on the metal pillar, and one side of the metal pillar contacts the horizontal push plate, which is fixed to the first vertical rod. The other side of the metal pillar is fixedly connected to an L-shaped guide pillar, which is movably sleeved in a small hole opened on the intercepting horizontal plate.

[0013] Preferably, the metal top plate is Z-shaped and one end of the plate is provided with an arc-shaped curved section. The arc-shaped curved section on the metal top plate rests on the conductive cylinder, and the horizontal push plate extends into the triangular groove opened on the metal column.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention achieves multi-control effect of filter unit through the design of bottom control frame. The filter unit can be easily installed and removed from the outer box, which improves the quality of power maintenance work. In addition, mechanical temperature control real-time monitoring equipment is set in the walking frame. Compared with the traditional electronic instrument temperature monitoring technology, the mechanical temperature control device can directly reduce the economic input cost of power grid.

[0016] 2. During the process of inserting the filter unit into the outer casing, the metal wheels will move in a straight line as they roll through the semi-circular section of the directional concave rail. When all the metal wheels are in the designated positions on the directional concave rail, the filter unit will press against the bow-shaped plate, triggering the control of the limiting device. This allows the lifting block to fall, and several metal wheels will fall smoothly into the semi-circular section of the directional concave rail. The locking body will then be inserted into the conductive cylinder, achieving the effect of automated control and locking. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the bottom control frame structure;

[0019] Figure 3 This is a diagram showing the location distribution of the hotspot controls;

[0020] Figure 4 This is a schematic diagram of the traveling frame structure;

[0021] Figure 5 This is a schematic diagram of the bracket structure;

[0022] Figure 6 for Figure 2 Schematic diagram of the structure at point A in the middle;

[0023] Figure 7 This is a schematic diagram of the brake lever frame structure;

[0024] Figure 8 This is a schematic diagram of the roller component structure;

[0025] Figure 9 This is a schematic diagram of the limiting device structure;

[0026] Figure 10 This is a schematic diagram of the contact component structure;

[0027] Figure 11 This is a schematic diagram of the side control plate structure;

[0028] Figure 12 This is a diagram showing the distribution of the supporting blocks.

[0029] In the diagram: 1. Outer casing; 2. Filter unit; 3. Bottom control frame; 4. Bracket; 5. Walking frame; 6. Heat-conducting plate; 7. Heat-conducting control unit; 8. Side control rod; 9. Limiting block; 10. First crossbar; 11. Roller component; 12. First longitudinal rod; 13. Directional concave rail; 14. Bow-shaped piece; 15. Brake rod bracket; 16. Second longitudinal rod; 17. Lifting rod; 18. Limiting device; 19. Second crossbar; 20. Z-shaped brake plate; 21. Conical body; 22. Limiting seat; 23. L-shaped insert rod; 24. First spring; 25. L-shaped direction plate; 26. Inner rod; 27. Brake rod; 28. L-shaped short plate; 29. ​​Contact component; 30. Conductive cylinder; 31. Metal wheel; 32. L-shaped piece; 33. Second spring; 34. Locking body; 35. Side control piece; 36. Lifting block; 37. Metal column; 38. Horizontal push plate; 39. L-shaped guide column; 40. Intercepting crossbar; 41. Fourth spring; 42. Metal top piece. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1 to 12 This invention provides a technical solution: a passive power filter for an active power quality defense system for power grids, comprising an outer casing 1, a filter unit 2 and a bottom control frame 3 disposed in the outer casing 1, the bottom control frame 3 connected below the filter unit 2, the bottom control frame 3 comprising a bracket 4, a walking frame 5, a heat-conducting plate 6 and a heat-conducting control 7, the bracket 4 being fixed to the inner wall of the outer casing 1, the walking frame 5 being connected above the bracket 4, the heat-conducting plate 6 being fixed above the walking frame 5 and fixed to the bottom of the filter unit 2, one end of the walking frame 5 being connected to the heat-conducting control 7, and the upper end of the heat-conducting control 7 being connected to the heat-conducting plate 6, the walking frame 5 comprising a first crossbar 10, roller components 11 and a first vertical bar 12, both ends of the first crossbar 10 being fixedly connected to the first vertical bar 12, a plurality of evenly distributed roller components 11 being drivenly connected to the first vertical bar 12, the upper end of the roller components 11 being connected to the filter unit 2, and the lower end of the roller components 11 contacting the bracket 4.

[0032] The bracket 4 includes a directional concave rail 13, an arc-shaped piece 14, a brake lever bracket 15, a second longitudinal rod 16, a lifting rod 17, a limiting device 18, and a second crossbar 19. Two parallel directional concave rails 13 are provided below the filter unit 2. The second longitudinal rod 16 is distributed parallel to one side of the directional concave rail 13, and the brake lever bracket 15 is distributed parallel to the other side. The lower end of the roller 11 extends into the directional concave rail 13. The lifting rod 17 is fixedly connected between the two directional concave rails 13. The second crossbar 19 is fixedly connected between the two second longitudinal rods 16. The arc-shaped piece 14 is fixedly connected between the two brake lever brackets 15. Several evenly distributed limiting devices 18 are provided on the directional concave rail 13.

[0033] The heat-conducting control unit 7 includes a Z-shaped brake plate 20, a conical body 21, and a limiting seat 22. The Z-shaped brake plate 20 passes through a square hole opened in the heat-conducting plate 6. One end of the Z-shaped brake plate 20 contacts several evenly distributed conical bodies 21. A limiting seat 22 is provided between the conical bodies 21 and the heat-conducting plate 6. The limiting seat 22 is a trapezoidal cylinder with several evenly distributed L-shaped plates fixed around its outer wall. The limiting seat 22 is fixed above the heat-conducting plate 6. The other end of the Z-shaped brake plate 20 contacts the first crossbar 10. (Refer to...) Figure 2 and Figure 6 It is understood that both the heat-conducting plate 6 and the limiting seat 22 are made of materials that are sensitive to heat conduction in the prior art. During the operation of the filter unit 2, some of the heat generated is transferred to the heat-conducting plate 6, and then transferred to the cone 21 through the limiting seat 22. The cone 21 is made of materials that are sensitive to thermal expansion and contraction in the prior art. When the cone 21 is heated and expands, under the support of the limiting seat 22, the shape of the cone 21 becomes larger. Then, the cone 21 pushes the Z-shaped brake plate 20 upward. The Z-shaped brake plate 20 rises and drives the first crossbar 10. The first crossbar 10 moves and drives the first vertical bar 12, thereby triggering the control of the roller component 11.

[0034] The second longitudinal rod 16 includes a side control rod 8 and a limiting block 9. The limiting block 9 is fixed on the directional concave rail 13 and has a square hole. The side control rod 8 passes through the square hole of the limiting block 9. One end of the side control rod 8 is fixed on the second crossbar 19. The side control rod 8 is prismatic in shape and has several arc-shaped protruding sections on its body. The arc-shaped protruding sections on the side control rod 8 contact the limiting device 18. The brake lever bracket 15 includes an L-shaped insert rod 23, a first spring 24, an L-shaped directional plate 25, an inner rod 26, and a brake lever 27. One end of the brake lever 27 is fixed on the bow-shaped plate 14, and one side of the brake lever 27 is fixedly connected to... Several evenly distributed L-shaped inserts 23, one end of which extends into the limiting device 18, and the other end of which is fixedly connected to an inner rod 26. An L-shaped directional plate 25 is provided on one side of the L-shaped insert 23, and the L-shaped directional plate 25 is fixed on the directional concave rail 13. A through hole is opened on the L-shaped directional plate 25, and the inner rod 26 is movably sleeved in the through hole of the L-shaped directional plate 25. A first spring 24 is placed between the L-shaped directional plate 25 and the L-shaped insert 23, and the first spring 24 is sleeved on the inner rod 26. One side plane of the brake lever 27 is in contact with one side plane of the L-shaped directional plate 25. (Reference) Figure 7 Understandably, this design enables spatial position control of the brake lever 27, allowing the brake lever 27 to move axially only within a certain range. In other words, the brake lever 27 drives the L-shaped insert rod 23, controlling the directional movement of the L-shaped insert rod 23.

[0035] The roller assembly 11 includes an L-shaped short plate 28, a contact 29, a conductive cylinder 30, and a metal wheel 31. The L-shaped short plate 28 is fixed to the bottom of the filter unit 2. One end of the L-shaped short plate 28 has a through hole, and the conductive cylinder 30 is movably sleeved in the through hole. One end of the conductive cylinder 30 is fixedly connected to the metal wheel 31, and part of the metal wheel 31 extends into the directional concave rail 13. The conductive cylinder 30 passes through the middle of the metal wheel 31. Limiting sleeves are fixed on the conductive cylinders 30 on both sides of the L-shaped short plate 28. The other end of the conductive cylinder 30 contacts the contact 29, and one end of the contact 29 extends into the filter unit 2. The L-shaped short plate 28 has a prism hole, and a first longitudinal rod 12 is movably sleeved in the prism hole.

[0036] The limiting device 18 includes an L-shaped piece 32, a second spring 33, a locking body 34, a side control piece 35, and a lifting block 36. One end of the L-shaped piece 32 is fixed on the directional groove 13. A through hole is opened on the L-shaped piece 32, and the locking body 34 is movably sleeved in the through hole. The locking body 34 is cylindrical with one end integrally connected to a hemisphere. The second spring 33 is movably sleeved on the locking body 34 and the cylinder. The second spring 33 is placed between the locking body 34 and the L-shaped piece 32. One side of the locking body 34 contacts the side control piece 35. One end of the side control piece 35 is fixedly connected to the lifting block 36, which passes through the directional groove 13.

[0037] The directional concave rail 13 is a concave long rail with several evenly distributed semi-circular curved sections. A square hole is opened in the center of each semi-circular curved section of the directional concave rail 13, and a lifting block 36 is movably fitted into the square hole. One end of the L-shaped insert 23 extends into a square groove on the lifting block 36. The side control plate 35 is an L-shaped plate with one end integrally connected to an arc-shaped plate. The arc-shaped plate on the side control plate 35 contacts the hemisphere on the locking body 34. (Reference) Figure 9 and Figure 7 Understanding: The second spring 33 elastically supports the locking body 34, which rests against the side control plate 35, limiting its movement. The side control plate 35 then drives the lifting block 36, thereby maintaining the relative position of the lifting block 36 and the directional concave rail 13. (See reference here.) Figure 12 It is understood that the arc-shaped section of the side control rod 8 is located on one side of the side control plate 35. The movement of the side control rod 8 is controlled by controlling the second crossbar 19. The arc-shaped section of the side control rod 8 rests on the side control plate 35. The side control plate 35 is made of elastic metal material in the prior art. The side control plate 35 can undergo a certain deformation. Under the push of the side control rod 8, the side control plate 35 bends away from the L-shaped plate 32. In this way, the second spring 33 elastically pushes the locking body 34, and the locking body 34 moves away from the directional concave rail 13. With this design, under the complete docking of the bracket 4 and the traveling frame 5, the docking relationship can be released by manually pushing the second crossbar 19 to control the movement of the side control rod 8, and then control the limiting device 18 to release the locking control of the conductive cylinder 30.

[0038] The contact element 29 includes a metal pillar 37, a horizontal push plate 38, an L-shaped guide post 39, an intercepting horizontal plate 40, a fourth spring 41, and a metal top plate 42. The upper end of the metal pillar 37 extends into the filter unit 2. The lower end of the metal pillar 37 is fixedly connected to the metal top plate 42, and the lower end of the metal top plate 42 rests on the conductive cylinder 30. The upper end of the metal top plate 42 contacts the fourth spring 41, and the upper end of the fourth spring 41 contacts the intercepting horizontal plate 40. One end of the intercepting horizontal plate 40 is fixedly connected to an L-shaped short plate 28. A through hole is opened on the intercepting horizontal plate 40, and the metal pillar 37 is movably sleeved in the through hole. The fourth spring 41 is sleeved on the metal pillar 37. One side of the metal pillar 37 contacts the horizontal push plate 38, which is fixed to the first vertical rod 12. The other side of the metal pillar 37 is fixedly connected to the L-shaped guide post 39, which is movably sleeved in the small hole opened on the intercepting horizontal plate 40.

[0039] The metal top plate 42 is Z-shaped with an arc-shaped bend at one end. The arc-shaped bend on the metal top plate 42 rests on the conductive cylinder 30. The horizontal push plate 38 extends into the triangular groove on the metal column 37. (See reference) Figure 7 and Figure 10Under the support of the fourth spring 41, the fourth spring 41 and the conductive cylinder 30 are in stable contact without affecting the rotation of the conductive cylinder 30. The extension of the metal column 37 into the filter unit 2 is wired to the device of the filter unit 2. The lower end of the lifting block 36 is provided with a wiring port, so that the external wire can be connected and extended to the outside of the outer casing 1. In this way, through the connection between the lifting block 36 and the contact 29, the external circuit can control the filter unit 2. When the metal wheel 31 moves and falls into the semi-circular section of the directional concave rail 13, that is, the metal wheel 31 presses against the lifting block 36. The circuit path is as follows: the metal wheel 31 is passed through the lifting block 36, the metal wheel 31 passes to the conductive cylinder 30, the conductive cylinder 30 passes to the metal top plate 42, the metal top plate 42 passes to the metal pillar 37, and then passes upward to the filter unit 2. The circuit interruption control can be achieved by controlling the movement of the first vertical rod 12. Specifically, the movement of the first vertical rod 12 drives the horizontal push plate 38, which falls into the triangular groove of the metal pillar 37, thereby forcing the metal pillar 37 to rise. The metal pillar 37 controls the metal top plate 42, and the metal top plate 42 rises and disconnects from the conductive cylinder 30.

[0040] To remove filter unit 2 from outer housing 1, the operator must manually push the second crossbar 19 inwards. The second crossbar 19 drives the side control rod 8, which moves and lifts several side control plates 35. This allows the locking body 34 to be pulled out of the conductive cylinder 30, and the roller 11 is no longer restricted. The operator can then manually pull filter unit 2 out of outer housing 1. To insert a new filter unit 2 into outer housing 1, align the metal wheel 31 with the directional concave rail 13 and push the new filter unit 2 inwards. Only when all the metal wheels 31 are inserted into the semi-circular curved section of the directional concave rail 13 will filter unit 2 rest on the bow-shaped plate 14. The bow-shaped plate 14 moves, driving the brake rod 27, which controls the movement of several L-shaped inserts 23. During this process, the L-shaped inserts 23 overcome the elastic pushing effect of the first spring 24 and are pulled out of the lifting block 36. 36 is placed at the semi-circular curved section of the directional concave rail 13, and the auxiliary metal wheel 31 rolls smoothly on the directional concave rail 13. After all the metal wheels 31 reach the designated position on the directional concave rail 13, the lifting block 36, which loses the locking position of the L-shaped insert 23, falls down. The metal wheels 31 fall along with it. The lifting block 36 drives the side control plate 35. The falling side control plate 35 pushes the locking body 34. The locking body 34 moves and inserts into the conductive cylinder 30, realizing the locking control of the conductive cylinder 30. In this way, the bracket 4 and the walking frame 5 are completely locked and connected. If the filter unit 2 overheats unexpectedly during operation, the heat is transferred to the heat conduction plate 6. After the transfer, the cone 21 is triggered to increase its deformation. The Z-shaped brake plate 20 will rise and drive the first crossbar 10. The first crossbar 10 controls the first vertical bar 12 to move. The first vertical bar 12 drives the horizontal push plate 38, thereby interrupting the circuit connection state of the contact 29 and realizing the circuit control of the filter unit 2.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A passive power filter for an active power quality defense system for power grids, comprising an outer casing (1), wherein a filter unit (2) and a bottom control frame (3) are disposed within the outer casing (1), characterized in that: The filter unit (2) is connected to a bottom control frame (3). The bottom control frame (3) includes a bracket (4), a walking frame (5), a heat-conducting plate (6), and a heat control device (7). The bracket (4) is fixed on the inner wall of the outer casing (1). The walking frame (5) is connected above the bracket (4). The heat-conducting plate (6) is fixed above the walking frame (5) and is fixed at the bottom of the filter unit (2). One end of the walking frame (5) is connected to the heat control device (7), and the upper end of the heat control device (7) is connected to the heat-conducting plate (6). The walking frame (5) includes a first crossbar (10), rollers (11), and a first vertical bar (12). The first vertical bar (12) is fixedly connected to both ends of the first crossbar (10). Several evenly distributed rollers (11) are driven and connected on the first vertical bar (12). The upper end of the rollers (11) is connected to the filter unit (2), and the lower end of the rollers (11) is in contact with the bracket (4). The bracket (4) includes a directional concave rail (13), an arc-shaped piece (14), a brake lever bracket (15), a second longitudinal rod (16), a lifting rod (17), a limiting device (18), and a second crossbar (19). Two parallel directional concave rails (13) are provided below the filter unit (2). The second longitudinal rod (16) is distributed parallel to one side of the directional concave rail (13), and the brake lever bracket (15) is distributed parallel to the other side. The lower end of the roller (11) extends into the directional concave rail (13). The lifting rod (17) is fixedly connected between the two directional concave rails (13). The second crossbar (19) is fixedly connected between the two second longitudinal rods (16). The arc-shaped piece (14) is fixedly connected between the two brake lever brackets (15). Several evenly distributed limiting devices (18) are provided on the directional concave rail (13). The roller component (11) includes an L-shaped short plate (28), a contact (29), a conductive cylinder (30), and a metal wheel (31). The L-shaped short plate (28) is fixed to the bottom of the filter unit (2). One end of the L-shaped short plate (28) has a through hole, and the conductive cylinder (30) is movably sleeved in the through hole. One end of the conductive cylinder (30) is fixedly connected to the metal wheel (31). Part of the metal wheel (31) extends into the directional concave rail (13). The conductive cylinder (30) passes through the middle of the metal wheel (31). Limiting sleeves are fixed on the conductive cylinders (30) on both sides of the L-shaped short plate (28). The other end of the conductive cylinder (30) contacts the contact (29). One end of the contact (29) extends into the filter unit (2). A prism hole is opened on the L-shaped short plate (28), and a first longitudinal rod (12) is movably sleeved in the prism hole. The limiting device (18) includes an L-shaped piece (32), a second spring (33), a locking body (34), a side control piece (35), and a lifting block (36). One end of the L-shaped piece (32) is fixed on the directional concave rail (13). A through hole is opened on the L-shaped piece (32), and the locking body (34) is movably sleeved in the through hole. The locking body (34) is cylindrical with one end integrally connected to a hemisphere. The second spring (33) is movably sleeved on the locking body (34) and the cylinder. The second spring (33) is placed between the locking body (34) and the L-shaped piece (32). One side of the locking body (34) contacts the side control piece (35). One end of the side control piece (35) is fixedly connected to the lifting block (36), and the lifting block (36) passes through the directional concave rail (13).

2. The passive power filter for an active power quality defense system for power grids according to claim 1, characterized in that: The heat control unit (7) includes a Z-shaped brake plate (20), a cone (21), and a limiting seat (22). The Z-shaped brake plate (20) passes through a square hole opened on the heat-conducting plate (6). One end of the Z-shaped brake plate (20) is in contact with several evenly distributed cones (21). A limiting seat (22) is provided between the cones (21) and the heat-conducting plate (6). The limiting seat (22) is shaped like a trapezoidal cylinder with several evenly distributed L-shaped plates on the outer wall. The limiting seat (22) is fixed above the heat-conducting plate (6). The other end of the Z-shaped brake plate (20) is in contact with the first crossbar (10).

3. The passive power filter for an active power quality defense system for power grids according to claim 1, characterized in that: The second longitudinal rod (16) includes a side control rod (8) and a limiting block (9). The limiting block (9) is fixed on the directional concave rail (13). A square hole is opened on the limiting block (9). The side control rod (8) passes through the square hole of the limiting block (9). One end of the side control rod (8) is fixed on the second crossbar (19). The side control rod (8) is prismatic in shape and has several arc-shaped protruding sections on the prism. The arc-shaped protruding sections on the side control rod (8) are in contact with the limiting device (18). The brake rod bracket (15) includes an L-shaped insert rod (23), a first spring (24), an L-shaped directional plate (25), an inner rod (26), and a brake rod (27). One end of the brake rod (27) is fixed on the bow-shaped plate (14). A number of evenly distributed L-shaped inserts (23) are fixedly connected to one side of the L-shaped insert (23). One end of the L-shaped insert (23) extends into the limiting device (18), and the other end of the L-shaped insert (23) is fixedly connected to the inner rod (26). An L-shaped directional plate (25) is provided on one side of the L-shaped insert (23). The L-shaped directional plate (25) is fixed on the directional concave rail (13). A through hole is opened on the L-shaped directional plate (25). The inner rod (26) is movably sleeved in the through hole of the L-shaped directional plate (25). A first spring (24) is placed between the L-shaped directional plate (25) and the L-shaped insert (23). The first spring (24) is sleeved on the inner rod (26). One side plane of the brake lever (27) is in contact with one side plane of the L-shaped directional plate (25).

4. The passive power filter for an active power quality defense system for power grids according to claim 1, characterized in that: The directional concave rail (13) is a concave long rail with several evenly distributed semi-circular curved sections. A square hole is opened in the middle of the semi-circular curved section of the directional concave rail (13), and a lifting block (36) is movably sleeved in the square hole. One end of the L-shaped insert (23) extends into the square groove opened on the lifting block (36). The side control plate (35) is an L-shaped plate with one end integrally connected to an arc plate. The arc plate on the side control plate (35) and the hemisphere on the locking body (34) are in contact.

5. A passive power filter for an active power quality defense system for power grids according to claim 1, characterized in that: The contact element (29) includes a metal post (37), a horizontal push plate (38), an L-shaped guide post (39), an intercepting horizontal plate (40), a fourth spring (41), and a metal top plate (42). The upper end of the metal post (37) extends into the filter unit (2), and the lower end of the metal post (37) is fixedly connected to the metal top plate (42). The lower end of the metal top plate (42) rests on the conductive cylinder (30), and the upper end of the metal top plate (42) contacts the fourth spring (41). The upper end of the fourth spring (41) contacts the intercepting horizontal plate. (40) One end of the intercepting horizontal plate (40) is fixedly connected to an L-shaped short plate (28). A through hole is opened on the intercepting horizontal plate (40), and a metal column (37) is movably sleeved in the through hole. A fourth spring (41) is sleeved on the metal column (37). One side of the metal column (37) is in contact with a horizontal push plate (38). The horizontal push plate (38) is fixed on the first vertical rod (12). The other side of the metal column (37) is fixedly connected to an L-shaped guide column (39). The L-shaped guide column (39) is movably sleeved in the small hole opened on the intercepting horizontal plate (40).

6. A passive power filter for an active power quality defense system for power grids according to claim 5, characterized in that: The metal top plate (42) is Z-shaped and has an arc-shaped curved section at one end. The arc-shaped curved section on the metal top plate (42) rests on the conductive cylinder (30), and the horizontal push plate (38) extends into the triangular groove opened on the metal column (37).

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