A device and method for eliminating resonant overvoltage in a power system

Abstract

This invention relates to the field of resonant overvoltage mitigation, specifically disclosing a resonant overvoltage suppression device and method in a power system. The device comprises two suppression units mounted on a positioning device. The positioning device includes a crossbar, with bearing seats for mounting the suppression units connected to the top of both ends of the crossbar. A rotating mounting sleeve is mounted in the middle of the crossbar, and a fixed seat is rotatably mounted at the bottom of the mounting sleeve. By using a resistor and the suppression unit in conjunction, the suppression capability is enhanced while ensuring the suppression unit is not easily damaged during use. Furthermore, the resistor can be used independently, ensuring that the suppression unit can be maintained independently during subsequent inspection and maintenance. Replacement after damage does not affect the normal operation of the power system, thus ensuring the safety performance of the power system.

Description

Technical Field

[0001] This invention relates to a harmonic suppression device, specifically to a harmonic suppression device and method for resonant overvoltage in a power system, belonging to the field of resonant overvoltage control. Background Technology

[0002] Ferroresonance is a form of self-excited oscillation in power systems, characterized by persistent, high-amplitude resonant overvoltages caused by the saturation of ferromagnetic inductance in transformers, voltage transformers, and other components. The core inductance in a resonant circuit is nonlinear, stabilizing as current increases and the core saturates. Ferroresonance requires specific excitation conditions to shift the voltage and current amplitudes from their normal operating state to the resonant state. These conditions can include a temporary increase in power supply voltage or a strong current surge. Ferroresonance exhibits a self-holding phenomenon; even after the excitation factors disappear, the ferromagnetic resonant overvoltage can persist for an extended period. Ferroresonant overvoltages are generally not very high; their amplitude primarily depends on the degree of saturation of the core inductance.

[0003] To ensure the normal and stable operation of power systems, harmonic suppression devices are commonly connected to the system to eliminate resonance. However, existing harmonic suppression devices have limited capabilities and cannot guarantee the safety of the power system under different resonance conditions. Furthermore, due to resonance, these devices can be damaged during use. When replacement is needed, the lack of harmonic suppression equipment in the power system makes it impossible to guarantee the safety of the power system in real time. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a harmonic suppression device and method for resonant overvoltage in a power system.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A harmonic suppression device for resonant overvoltage in a power system includes two harmonic suppressor bodies. The harmonic suppressor bodies are mounted on a positioning device. The positioning device includes a crossbar. The top of both ends of the crossbar are connected to a bearing seat for mounting the harmonic suppressor bodies. A rotating mounting sleeve is mounted in the middle of the crossbar. A fixed seat is rotatably mounted at the bottom of the mounting sleeve.

[0007] Optionally, the top of the crossbar is connected to both ends of the mounting sleeve with upwardly inclined air ducts. The top of the air ducts is inclined toward the harmonic suppressor body on the same side. A fan is installed at the bottom of the crossbar, and the air outlet of the fan is connected to the air duct through a pipe.

[0008] Optionally, a support mechanism is installed on the top of one side of the harmonic suppressor body. The support mechanism includes an outer shell, a first support rod, and a second support rod. A connecting plate is connected to the top of the outer shell, a guide rod is connected to the top of the connecting plate, a wiring plate is connected to one side of the guide rod, an end rod is connected to the top of the guide rod, and one end of the end rod is connected to the upper side of the second support rod.

[0009] Optionally, the bottom end of the second support rod away from the end rod is rotatably mounted to the upper end of the first support rod, and a fixed pull plate is rotatably mounted on the bottom end of the first support rod away from the second support rod.

[0010] Optionally, a pin is fixed to the top of the first support rod, the pin is inserted into the bottom of the second support rod, and a fastening bolt is connected to one side of the bottom of the second support rod, with one end of the fastening bolt extending into the bottom of the second support rod and abutting against the outer wall of the pin.

[0011] One end of the fixed pull plate is also fixed with a pin, which is inserted into the bottom end of the first support rod. A fastening bolt is also connected to one side of the bottom of the first support rod, with one end of the fastening bolt extending into the bottom end of the first support rod and abutting against the outer wall of the pin.

[0012] Optionally, a placement shell for placing fire-fighting equipment is also installed at the connection between the top of the outer casing and the connecting plate. A cylindrical fixing shell is installed in the lower middle part of the outer casing. A snap-fit ​​sleeve is connected to the lower middle part of the interior of the fixing shell. The top of one of the damping devices is inserted into the interior of the snap-fit ​​sleeve. A wind turbine is rotatably installed on the outside of the snap-fit ​​sleeve. Multiple through holes are opened on the outer wall of the outer casing along the circumferential direction.

[0013] Optionally, multiple partitions are connected between the inner wall of the fixed shell and the outer wall of the snap-fit ​​sleeve. Multiple discharge ports are opened at the bottom of the partitions. The top of the discharge ports is connected to the discharge end of the fire-fighting equipment placed inside the shell through a conveying pipe. A smoke sensor is installed below one of the partitions.

[0014] Optionally, a conductive block is provided at the upper end of the snap-fit ​​sleeve. The conductive block abuts against the top of the harmonic suppressor body, and the top of the conductive block is electrically connected to the guide rod through a circuit. Both the connecting plate and the end rod are made of insulating material.

[0015] A method for eliminating resonant overvoltage in a power system, the method utilizing the aforementioned elimination device, and the method comprising the following steps:

[0016] Step 1: Connect one of the harmonic suppressors to the power system, detect the working status of the power system, and obtain the working status result of the power system. Divide the working status result of the power system into the resonance state and the non-resonance state. Before detection, switch K1 is kept in the closed state and K2 is in the open state.

[0017] Step 2: If the result of the working state is a resonance state, then K1 is opened, and resistor R and the body of the harmonic suppressor are connected to the power system. The power system is then harmonic suppressed using resistor R and the body of the harmonic suppressor.

[0018] Step 3: If the working state is non-resonant, K1 will remain closed, and resistor R and the body of the harmonic suppressor will be short-circuited.

[0019] Step 4: If the harmonic suppressor body is replaced, open K1 and close K2 to put the harmonic suppressor body in a short-circuit state.

[0020] The beneficial effects of this invention are:

[0021] 1. By using resistors and harmonic suppressors together, the harmonic suppression capability can be improved, while ensuring that the harmonic suppressor is not easily damaged during use. Furthermore, the resistor can be used independently, ensuring that the harmonic suppressor can be maintained and repaired independently. Replacement of the suppressor after damage will not affect the normal operation of the power system, thus guaranteeing the safety performance of the power system.

[0022] 2. By setting a limiting device and a support mechanism, during the operation, the external wind blows the impeller through the through hole, causing the impeller to rotate. The impeller blows air onto the harmonic suppressor body from above, making it difficult for dust, snow and other impurities to accumulate on the outside of the harmonic suppressor body. At the same time, it can cool the harmonic suppressor body during operation, so that the harmonic suppressor body can maintain a good working condition.

[0023] 3. When the harmonic suppressor body is damaged during the harmonic suppression process, resulting in breakdown or fire, fire-fighting materials are sprayed from the outlet towards the harmonic suppressor body below, providing timely protection and preventing further damage. Furthermore, the rotation of the impeller during fire-fighting material spraying helps to ensure more even spraying, thereby improving fire-fighting capabilities. When replacing the harmonic suppressor body, the switch located above it is pressed during the rotation of the installation sleeve, causing the fan below the crossbar to operate. Airflow is discharged from the top of the duct, cleaning the exterior of the harmonic suppressor body and the interior of the clamping sleeve. This ensures that no impurities or other objects are present at the connection between the harmonic suppressor body and the clamping sleeve during subsequent installation, guaranteeing normal circuit operation and preventing poor contact. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2This is a schematic diagram of the positioning device of the present invention.

[0027] Figure 3 This is a schematic diagram of the installation structure of the harmonic suppressor body and the support mechanism of the present invention.

[0028] Figure 4 This is a schematic diagram of the support mechanism structure of the present invention.

[0029] Figure 5 This is a schematic diagram of the top structure of the outer casing of the present invention.

[0030] Figure 6 This is a schematic diagram of the bottom structure of the outer casing of the present invention.

[0031] In the diagram: 1. Crossbar; 2. Air duct; 3. Mounting sleeve; 4. Fixing base; 5. Outer casing; 6. Bearing base; 7. Harmonic suppressor body; 8. Connecting plate; 9. Outer casing; 10. Support mechanism; 11. Fixing pull plate; 12. Fastening bolt; 13. First support rod; 14. Second support rod; 15. End rod; 16. Wiring plate; 17. Guide rod; 18. Through hole; 19. Placement shell; 20. Impeller; 21. Fixing shell; 22. Partition plate; 23. Snap-fit ​​sleeve; 24. Discharge port. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments 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.

[0033] Please see Figure 1-6 As shown, a harmonic suppression device for resonant overvoltage in a power system includes two harmonic suppressor bodies 7. The harmonic suppressor bodies 7 are mounted on a positioning device. The positioning device includes a crossbar 1. The top of both ends of the crossbar 1 are connected to a bearing seat 6 for mounting the harmonic suppressor bodies 7. A rotating mounting sleeve 3 is mounted in the middle of the crossbar 1. A fixed seat 4 is rotatably mounted at the bottom of the mounting sleeve 3.

[0034] As a technical optimization of the present invention, the top of the crossbar 1 is connected to both ends of the mounting sleeve 3 with upwardly inclined air ducts 2. The top of the air ducts 2 is inclined toward the harmonic suppressor body 7 on the same side. A fan is installed at the bottom of the crossbar 1, and the air outlet of the fan is connected to the air duct 2 through a pipe.

[0035] As a technical optimization of the present invention, a support mechanism 10 is installed on the top of the harmonic suppressor body 7. The support mechanism 10 includes an outer shell 9, a first support rod 13 and a second support rod 14. A connecting plate 8 is connected to the top of the outer shell 9, a guide rod 17 is connected to the top of the connecting plate 8, a wiring plate 16 is connected to one side of the guide rod 17, an end rod 15 is connected to the top of the guide rod 17, and one end of the end rod 15 is connected to the upper side of the second support rod 14.

[0036] As a technical optimization of the present invention, the bottom end of the second support rod 14, away from the end rod 15, is rotatably mounted to the upper end of the first support rod 13, and a fixing pull plate 11 is rotatably mounted on the bottom end of the first support rod 13, away from the second support rod 14.

[0037] As a technical optimization of the present invention, a pin is fixed to the top of the first support rod 13, the pin is inserted into the bottom of the second support rod 14, and a fastening bolt 12 is connected to one side of the bottom of the second support rod 14. One end of the fastening bolt 12 extends into the bottom of the second support rod 14 and abuts against the outer wall of the pin.

[0038] One end of the fixed pull plate 11 is also fixed with a pin, which is inserted into the bottom end of the first support rod 13. A fastening bolt 12 is also connected to one side of the bottom of the first support rod 13. One end of the fastening bolt 12 extends into the bottom end of the first support rod 13 and abuts against the outer wall of the pin.

[0039] As a technical optimization of the present invention, a placement shell 19 for placing fire-fighting equipment is also installed at the connection between the top of the outer shell 9 and the connecting plate 8. A cylindrical fixing shell 21 is installed in the lower middle part of the outer shell 9. A snap-fit ​​sleeve 23 is connected to the lower middle part of the interior of the fixing shell 21. The top end of one of the harmonic suppressor bodies 7 is inserted into the interior of the snap-fit ​​sleeve 23. A wind turbine 20 is rotatably installed on the outside of the snap-fit ​​sleeve 23. Multiple through holes 18 are opened along the circumferential direction on the outer wall of the outer shell 9.

[0040] As a technical optimization of the present invention, a plurality of partitions 22 are connected between the inner wall of the fixed shell 21 and the outer wall of the snap-fit ​​sleeve 23. A plurality of discharge ports 24 are provided at the bottom of the partitions 22. The top of the discharge ports 24 are connected to the discharge end of the fire-fighting equipment inside the shell 19 through a conveying pipe. A smoke sensor is installed below one of the partitions 22.

[0041] As a technical optimization of the present invention, a conductive block is provided at the upper end of the snap-fit ​​sleeve 23. The conductive block abuts against the top of the harmonic suppressor body 7, and the top of the conductive block is electrically connected to the guide rod 17 through a circuit. The connecting plate 8 and the end rod 15 are both made of insulating material.

[0042] A method for eliminating resonant overvoltage in a power system, the method utilizing the aforementioned elimination device, and the method comprising the following steps:

[0043] Step 1: Connect one of the harmonic suppressor bodies 7 into the power system, detect the working status of the power system, obtain the working status result of the power system, divide the working status result of the power system into resonance state and non-resonance state, and keep the switch K1 in the closed state and K2 in the open state before detection.

[0044] Step 2: If the result of the working state is a resonance state, then K1 is opened, and resistor R and the harmonic suppressor body 7 are connected to the power system. Resistor R and harmonic suppressor body 7 are used to suppress the harmonics in the power system.

[0045] Step 3: If the working state is non-resonant, K1 will remain closed, and resistor R and the body of the harmonic suppressor 7 will be short-circuited.

[0046] Step 4: If replacing the harmonic suppressor body 7, open K1 and close K2 to short-circuit the harmonic suppressor body 7. The harmonic suppressor body 7 is one type of harmonic suppressor and can be selected according to actual working requirements.

[0047] In use, the mounting sleeve 3 is installed at a preset position via the fixing seat 4, and the support mechanism 10 is also installed at a preset position via the fixing pull plate 11. Then, a harmonic suppressor body 7 is installed on the bearing seats 6 at both ends of the top of the crossbar 1. Rotating the crossbar 1 moves one of the harmonic suppressor bodies 7 below the outer casing 9. Pushing the rubber end rod 15 upwards moves the outer casing 9 upwards, allowing the snap-fit ​​sleeve 23 at the bottom of the outer casing 9 to snap onto the top of the harmonic suppressor body 7. The terminal block 16 is then connected to a preset position in the power system via a wire. The bottom of the harmonic suppressor body 7 is connected to a preset external position using commonly used equipment, allowing the harmonic suppressor body 7 to function normally. A protective outer sleeve 5 is fitted over the other end of the idle harmonic suppressor body 7 to prevent damage and ensure it remains in good working order for future use. Furthermore, during use, the support mechanism 10 can be adjusted according to the installation position of the harmonic suppressor body 7 and the tilt angle after installation. In turn, the fastening bolts 12 can be tightened to adjust the tilt angle of the first support rod 13 and the second support rod 14, so that the outer casing 9 can adapt to different installation requirements.

[0048] When resonance occurs in the power system, K1 is tripped, and resistor R and the harmonic suppressor body 7 are connected to the power system. Resistor R and harmonic suppressor body 7 are used to suppress the harmonics in the power system, which can ensure that the power system can work normally and is not prone to damage.

[0049] During operation, external wind blows through the through hole 18 to the impeller 20, causing the impeller 20 to rotate. The impeller 20 blows air from above onto the harmonic suppressor body 7, making it difficult for dust, snow and other impurities to accumulate on the outside of the harmonic suppressor body 7. At the same time, it can cool the harmonic suppressor body 7 during operation, so that the harmonic suppressor body 7 can maintain a good working condition.

[0050] When the harmonic suppressor body 7 is damaged during the harmonic suppression process, resulting in a breakdown or fire, the smoke sensor below the partition 22 detects smoke and, through a preset control system, activates the fire-fighting equipment inside the housing 19. Fire-fighting materials are sprayed from the discharge port 24 onto the harmonic suppressor body 7 below, providing timely protection and preventing further damage. Furthermore, during the fire-fighting material spraying process, the rotation of the impeller 20 helps to spray the fire-fighting materials more evenly, thereby improving fire-fighting capabilities.

[0051] When the harmonic suppressor body 7 is damaged, K1 is opened and K2 is closed, putting the harmonic suppressor body 7 in a short-circuit state. Resistor R is connected to the power system to ensure that the power system can be harmonic-suppressed when resonance occurs, avoiding a situation where the harmonic suppressor body 7 is replaced without timely protection. When replacing the harmonic suppressor body 7, push the outer casing 9 upward to detach it from the top of the damaged harmonic suppressor body 7. Then, remove the damaged harmonic suppressor body 7 from the crossbar 1. Rotate the crossbar 1 to rotate the other end of the idle harmonic suppressor body 7 to the bottom of the outer casing 9 for installation. Another idle harmonic suppressor body 7 is then installed on the empty end of the crossbar 1 for future use. This improves the efficiency of replacing the harmonic suppressor body 7, ensuring that subsequent maintenance and repairs will not affect the normal operation of the power system. When replacing the harmonic suppressor body 7, the switch above the mounting sleeve 3 is pressed during rotation, which causes the fan below the crossbar 1 to run. The airflow is discharged from the top of the air duct 2. The discharged airflow blows and cleans the exterior of the harmonic suppressor body 7 to be used and the interior of the snap-fit ​​sleeve 23, so that there are no impurities or other objects at the connection between the harmonic suppressor body 7 and the snap-fit ​​sleeve 23 during subsequent installation, ensuring the normal use of the line and preventing poor contact.

[0052] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A harmonic suppression device for resonant overvoltage in a power system, comprising two harmonic suppressor bodies (7), characterized in that, The harmonic suppressor body (7) is mounted on a positioning device. The positioning device includes a crossbar (1). The top of both ends of the crossbar (1) are connected to a bearing seat (6) for mounting the harmonic suppressor body (7). A rotating mounting sleeve (3) is mounted in the middle of the crossbar (1). A fixed seat (4) is rotatably mounted at the bottom of the mounting sleeve (3). The top of the crossbar (1) is connected to both ends of the mounting sleeve (3) with upwardly inclined air pipes (2). The top of the air pipes (2) is inclined toward the harmonic suppressor body (7) on the same side. A fan is installed at the bottom of the crossbar (1). The air outlet of the fan is connected to the air pipe (2) through a pipe. A support mechanism (10) is installed on the top of the harmonic suppressor body (7) on one side. The support mechanism (10) includes an outer shell (9), a first support rod (13) and a second support rod (14). A connecting plate (8) is connected to the top of the outer shell (9). A guide rod (17) is connected to the top of the connecting plate (8). A wiring plate (16) is connected to one side of the guide rod (17). An end rod (15) is connected to the top of the guide rod (17). One end of the end rod (15) is connected to the upper side of the second support rod (14). The bottom end of the second support rod (14) away from the end rod (15) is rotatably mounted to the upper end of the first support rod (13), and a fixed pull plate (11) is rotatably mounted on the bottom end of the first support rod (13) away from the second support rod (14). The top of the outer casing (9) is connected to the connecting plate (8) and a placement shell (19) for placing fire-fighting equipment is also installed. A cylindrical fixing shell (21) is installed in the lower middle part of the outer casing (9). A snap-fit ​​sleeve (23) is connected in the lower middle part of the interior of the fixing shell (21). The top of one of the damping device bodies (7) is inserted into the interior of the snap-fit ​​sleeve (23). A windmill (20) is rotatably installed on the outside of the snap-fit ​​sleeve (23). Multiple through holes (18) are opened along the circumferential direction on the outer wall of the outer casing (9). Multiple partitions (22) are connected between the inner wall of the fixed shell (21) and the outer wall of the snap-fit ​​sleeve (23). Multiple discharge ports (24) are opened at the bottom of the partitions (22). The top of the discharge port (24) is connected to the discharge end of the fire-fighting equipment inside the housing (19) through a conveying pipe. A smoke sensor is installed below one of the partitions (22).

2. The harmonic suppression device for resonant overvoltage in a power system according to claim 1, characterized in that, The top end of the first support rod (13) is fixed with a pin, which is inserted into the bottom end of the second support rod (14). A fastening bolt (12) is connected to one side of the bottom of the second support rod (14), and one end of the fastening bolt (12) extends into the bottom end of the second support rod (14) and abuts against the outer wall of the pin. One end of the fixed pull plate (11) is also fixed with a pin, which is inserted into the bottom end of the first support rod (13). A fastening bolt (12) is also connected to the bottom side of the first support rod (13), and one end of the fastening bolt (12) extends to the bottom end of the first support rod (13) and abuts against the outer wall of the pin.

3. A harmonic suppression device for resonant overvoltage in a power system according to claim 2, characterized in that, The upper part of the snap-fit ​​sleeve (23) is provided with a conductive block. The conductive block abuts against the top of the harmonic suppressor body (7), and the top of the conductive block is electrically connected to the guide rod (17) through a circuit. The connecting plate (8) and the end rod (15) are both made of insulating material.

4. A method for eliminating resonant overvoltage in a power system, characterized in that, The harmonic cancellation method utilizes the harmonic cancellation device described in claim 3, and the harmonic cancellation method includes the following steps: Step 1: Connect one of the harmonic suppressors (7) into the power system, detect the working status of the power system, obtain the working status result of the power system, divide the working status result of the power system into resonance state and no resonance state, detect that the switch K1 is in the closed state and K2 is in the open state. Step 2: If the result of the working state is the resonance state, then K1 is opened, and the resistor R and the body of the harmonic suppressor (7) are connected to the power system. The resistor R and the body of the harmonic suppressor (7) are used to suppress the harmonics in the power system. Step 3: If the working state is no resonance state, K1 continues to be closed, and resistor R and the body of the harmonic suppressor (7) are short-circuited. Step 4: If the harmonic suppressor body (7) is replaced, open K1 and close K2 to put the harmonic suppressor body (7) in a short-circuit state.

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