Low-voltage power grid reactive compensation system

Abstract

The invention relates to the technical field of reactive compensation systems, in particular to a low-voltage power grid reactive compensation system which comprises a reactive power acquisition unit, a data processing unit, an intelligent control unit, a compensation unit and a feedback unit. The reactive power acquisition unit utilizes an acquisition module and a monitoring module to monitor and acquire parameters of reactive power, voltage and current in a power grid in real time, and the data are acquired, so that evaluation and basis are provided for the running state of the power grid and formulating of a compensation strategy; the data processing unit is used for analyzing the collected parameters of reactive power, voltage and current in the power grid so as to judge whether the power grid needs reactive power or is excessive; the circulating cooling effect is improved, the cooling energy consumption is reduced, the fire extinguishing efficiency is improved, the fire extinguishing safety is improved, the voltage quality is improved, the operation stability of a power grid is improved, the service life of a transformer is prolonged, and the maintenance cost of equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power compensation systems, and particularly to a low-voltage power grid reactive power compensation system. Background Art

[0002] With the continuous improvement of the demand for electric energy in modern society, the power grid transmission efficiency and power quality are facing severe tests. In the low-voltage power grid, due to the large number of inductive loads such as motors and transformers, the power grid often needs to provide reactive power to these devices. However, the flow of reactive power will not only reduce the transmission efficiency of the power grid, but also increase the losses of lines and transformers, resulting in voltage fluctuations and a decline in power quality. To solve this problem, reactive power compensation technology has emerged and has been widely used in low-voltage power grids.

[0003] For example, in the patent with the prior art publication number CN203180532U, this utility model discloses a low-voltage hybrid reactive power compensation device. This reactive power compensation device is externally connected to the power supply grid, and this reactive power compensation device includes: a plurality of reactive power compensators, whose circuits are connected to the externally connected power supply grid; a reactive power generator, whose circuit is connected to the externally connected power supply grid; a control bus, which is circuit-connected to the externally connected power supply grid and is respectively circuit-connected to the reactive power compensators and the reactive power generator.

[0004] However, it is found in the use of this device that the safety protection effect of this device is poor, and there is a risk of fire, reducing the use safety. Moreover, this device is not convenient for intelligently analyzing the power parameter results and formulating a reasonable compensation strategy, reducing the convenience of use. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a low-voltage power grid reactive power compensation system that improves the circulating cooling and temperature reduction effect, reduces the cooling energy consumption, improves the fire extinguishing efficiency, improves the fire extinguishing safety, helps to improve the voltage quality, improves the operation stability of the power grid, extends the service life of the transformer, and reduces the equipment maintenance cost.

[0006] A low-voltage power grid reactive power compensation system of the present invention includes a reactive power acquisition unit, a data processing unit, an intelligent control unit, a compensation unit, and a feedback unit;

[0007] The reactive power acquisition unit uses the acquisition module and the monitoring module to continuously monitor and acquire the parameters of reactive power, voltage, and current in the power grid. By collecting these data, it is convenient to provide an evaluation and basis for the power grid operation status and formulating a compensation strategy; by continuously monitoring the voltage and current signals in the low-voltage power grid, the active power, reactive power, and power factor parameters of the power grid are calculated through calculation;

[0008] The data processing unit is used to analyze the parameters of reactive power, voltage, and current in the collected power grid to determine whether there is a demand for reactive power or an excess situation in the power grid;

[0009] The intelligent control unit is used to formulate a compensation strategy according to the parameter analysis results of the power information by the data processing unit when compensation is required; according to the real-time monitored reactive power demand and the actual situation of the power grid, the intelligent control unit calculates the required compensation amount, which is the reactive power that the power grid system needs to provide or absorb, so as to balance the reactive power demand in the power grid. At the same time, the formulation of the compensation strategy comprehensively analyzes the stability, security, and economy of the power grid pressure to improve the effectiveness and rationality of the compensation;

[0010] The compensation unit is used to control the operation of the compensation equipment so that the compensation equipment can achieve the required compensation amount. After the intelligent control unit determines the compensation strategy, the intelligent control unit sends the compensation strategy to the compensation unit. The compensation unit uses the set switching decision to control the switching of the capacitor bank and adjusts the operation of the reactor to provide or absorb the corresponding reactive power to achieve the accuracy and stability of the required compensation amount and keep the power factor of the power grid within the set range; when it is monitored that the power factor is lower than the set value, the compensation unit issues a switching instruction to the switching device according to the magnitude of the reactive power and the capacity of the capacitor bank. If the reactive power is large and a large-capacity capacitor bank needs to be put into operation, the switching device will put the corresponding capacitor into the power grid according to the instruction. On the contrary, when the reactive power decreases and the power factor rises to a certain extent, the switching device will remove some or all of the capacitors from the power grid;

[0011] The feedback unit is used to feedback the power factor of the power grid in real time and adjust the compensation in time; during the compensation process, the feedback unit continuously monitors the parameters of reactive power, voltage, and current of the power grid after compensation to ensure that the compensation effect meets the expectations. When it is detected that the compensation effect is not ideal or the power grid state changes, the feedback unit will send information to the intelligent control unit in time to make the compensation unit adjust the compensation strategy to ensure the stable operation of the power grid; after the capacitor bank is put into operation, the capacitor provides reactive power to the power grid, thus reducing the reactive power obtained by the power grid from the power supply end. According to the principle of reactive power balance, the reactive current in the power grid decreases, and the total current in the line also decreases accordingly, improving the power factor. At the same time, the power loss in the line is reduced. Since the line current decreases, the line voltage drop also decreases, which helps to improve the voltage quality and the operation stability of the power grid. And reactive power compensation reduces the load current of the transformer, extends the service life of the transformer, and reduces the maintenance cost of the equipment.

[0012] Preferably, a protection unit is further included;

[0013] The protection unit is used to monitor the voltage and current conditions during the operation of the power grid in real time. When abnormal current or voltage occurs in the power grid, by sending information to the intelligent control unit, the intelligent control unit controls the operation of the compensation unit. Through the switching of the capacitor bank and the timely adjustment of the reactor by the compensation unit, over-current protection, over-voltage protection and under-voltage protection of the power grid are realized, damage to the capacitor bank and other equipment is reduced, and the safe and reliable operation of the reactive power compensation system is improved.

[0014] Preferably, the protection unit further includes a safety unit;

[0015] The safety unit is used to protect the electrical components in the low-voltage power grid reactive power compensation system, and by monitoring the temperature and smoke of the electrical components, it provides reliable and effective fire extinguishing and cooling protection for them.

[0016] Preferably, a communication unit is further included;

[0017] The communication unit is used to realize data transmission and remote control between the units of the system, and improve the reliability and flexibility of the system.

[0018] Preferably, the safety unit includes a conveying device, a cooling device, a first housing, a closing door, a first inner housing, a storage cylinder, a feeding interface, a cover body, a plurality of discharge pipes and an exhaust pipe. The first inner housing is installed on the inner side wall of the first housing, and a chamber is provided between the first inner housing and the first housing. A medium-boiling-point evaporation medium is provided in the chamber. The closing door is installed at the operation port of the first inner housing. The storage cylinder is installed at the top of the first housing, and the bottom opening of the storage cylinder extends into the first inner housing. The feeding interface is communicatively provided on the upper part of the outer side wall of the storage cylinder. The cover body is rotatably and vertically slidably installed on the outer side wall of the storage cylinder and communicates with the bottom end of the storage cylinder. A plurality of discharge pipes are communicatively provided on the outer side wall of the cover body, and a plurality of discharge ports are respectively provided on the lower parts of the outer side walls of the plurality of discharge pipes. The conveying device is provided on the storage cylinder and is used to feed dry powder fire extinguishing agent and carbon dioxide gas into the first inner housing. The exhaust pipe is communicatively provided on the lower part of the outer side wall of the first inner housing. The cooling device is provided on the first housing and is used to cool and lower the temperature of the medium-boiling-point evaporation medium. The electrical components in the low-voltage power grid reactive power compensation system are installed inside the first inner housing. The first inner housing is maintained at a certain low temperature by the medium-boiling-point evaporation medium in the chamber, so that the first inner housing cools the electrical components inside, improves the cooling and constant temperature effect of the first inner housing on the electrical components, improves the stability of temperature control. The medium-boiling-point evaporation medium evaporated by heat in the chamber enters the cooling device, and after being cooled by the cooling device, it condenses into a liquid again, and the liquid flows back into the chamber for continued use, improving the cyclic cooling effect and reducing the cooling energy consumption. The dry powder fire extinguishing agent is stored inside the storage cylinder. When a fire occurs inside the first inner housing, the carbon dioxide gas is conveyed into the storage cylinder through the conveying device, and after being mixed with the dry powder fire extinguishing agent, it is conveyed into the plurality of discharge pipes, and the fire extinguishing agent is discharged into the first inner housing through the plurality of discharge pipes, improving the fire extinguishing efficiency inside the first inner housing and the fire extinguishing safety.

[0019] Preferably, the conveying device includes an air inlet device, a support device, a box body, a first conveying pipe, a spline sleeve, a spline shaft, a sealing plate, a sealing ring, a spiral blade and an impeller. The box body is installed at the top of the storage cylinder and is communicated with the air inlet device. The air inlet device is used to convey carbon dioxide gas into the box body. The input end of the first conveying pipe is communicated with the box body, and the output end of the first conveying pipe is communicated with the storage cylinder. The spline sleeve is rotatably installed inside the box body. The upper part of the spline shaft is slidably installed at the bottom of the spline sleeve. The bottom end of the spline shaft is connected to the inner side wall of the cover body. The sealing plate is installed on the outer side wall of the spline shaft. The sealing ring is installed on the inner side wall of the storage cylinder, and the sealing plate contacts the sealing ring. The spiral blade is installed on the outer side wall of the spline shaft. The support device is arranged inside the storage cylinder and is used to provide an upward elastic support force for the spline shaft. The impeller is installed on the outer side wall of the spline sleeve. When the air inlet device conveys carbon dioxide gas through the inside of the box body, the carbon dioxide gas drives the impeller to rotate. After the impeller rotates, it drives the spline sleeve to rotate. The rotation of the spline sleeve drives the spline shaft to rotate, so that the spline shaft drives the spiral blade and the cover body to rotate. After the spiral blade rotates, it conveys the dry powder fire extinguishing agent in the storage cylinder downward. After the cover body rotates, it drives multiple discharge pipes to move circumferentially. At the same time, since the carbon dioxide gas is conveyed into the storage cylinder through the first conveying pipe, the air pressure pushes the sealing plate downward, so that the carbon dioxide gas and the dry powder fire extinguishing agent in the storage cylinder are discharged downward through the gap between the sealing plate and the sealing ring. The discharged mixed fire extinguishing agent is conveyed into the first inner shell for fire extinguishing, improving the fire extinguishing efficiency. By moving the multiple discharge pipes circumferentially, the spraying uniformity and comprehensiveness of the fire extinguishing agent are improved, and the fire extinguishing effect is improved.

[0020] Preferably, the support device includes a bracket, a telescopic rod, a spring, a support seat and a support sleeve. The bracket is installed on the inner side wall of the storage cylinder. Multiple telescopic rods are installed at the top of the bracket. Multiple springs are respectively sleeved on the outer side walls of the multiple telescopic rods. The support seat is installed at the top of the multiple telescopic rods. The support sleeve is installed on the outer side wall of the spline shaft. The bottom end of the support sleeve is rotatably connected to the top end of the support seat. The upward movement of the support seat is supported by multiple springs, so that the support seat drives the spline shaft to move upward through the support sleeve, so that the contact seal between the sealing plate and the sealing ring is realized. After the air pressure pushes the sealing plate downward, the sealing plate drives the support seat to move downward, improving the convenience of the sealing plate to reset.

[0021] Preferably, the cooling device includes a second housing, a second inner housing, first fins, a semiconductor refrigeration plate, second fins, and a fan. The second housing is installed at the top of the first housing. The second inner housing is disposed inside the second housing, and the bottom end of the second inner housing communicates with the chamber. Cooling water is provided inside the second housing, and the second inner housing is immersed in the cooling water. A plurality of groups of first fins are all arranged on the outer side wall of the second inner housing. The semiconductor refrigeration plate is installed on the outer side wall of the second housing, and the refrigerating end of the semiconductor refrigeration plate communicates with the inside of the second housing. A plurality of groups of second fins are all arranged on the heat dissipation end of the semiconductor refrigeration plate. The fan is installed on the outer side wall of the second housing. The medium and low boiling point evaporation medium evaporated in the chamber enters the inside of the second inner housing upward. The cooling water inside the second housing is cooled by the semiconductor refrigeration plate, so that the cooling water cools the second inner housing, and the second inner housing cools the medium and low boiling point evaporation medium evaporated inside, and the condensed medium and low boiling point evaporation medium flows back into the chamber, thereby achieving the effect of cooling and constant temperature of the electrical components inside the first inner housing and improving the stability of temperature control.

[0022] Preferably, the air inlet device includes a storage tank, a second delivery pipe, a pump body, and a valve. The input end of the second delivery pipe communicates with the storage tank, and the output end of the second delivery pipe communicates with the box body. The pump body is installed on the outer side wall of the first housing and is communicatively arranged on the second delivery pipe. The valve is communicatively arranged on the second delivery pipe. By opening the valve, the compressed carbon dioxide gas stored in the storage tank is conveyed into the box body through the second delivery pipe, and then the carbon dioxide gas is conveyed into the storage cylinder through the first delivery pipe. By starting the pump body, it is convenient to increase the pressure of the carbon dioxide gas entering the box body, improve the power effect of the impeller, and at the same time improve the downward pushing effect of the sealing plate.

[0023] Preferably, it further includes a first positioning ring and a second positioning ring. The first positioning ring is installed on the outer side wall of the storage cylinder, and the second positioning ring is installed on the outer side wall of the cover body. Grooves are respectively arranged on the first positioning ring and the second positioning ring, and the first positioning ring and the second positioning ring are arranged in cooperation through the grooves. After the spline shaft drives the cover body to move downward, the cover body drives the second positioning ring to move downward and separate from the first positioning ring, so as to facilitate the rotation of the cover body. After the cover body moves upward, the grooves between the first positioning ring and the second positioning ring are engaged, so as to brake the rotation of the cover body and improve the convenience of fixing the cover body.

[0024] The beneficial effects of the present invention compared with the prior art are as follows: When the capacitor bank is put into operation, the capacitors supply reactive power to the power grid, thereby reducing the reactive power obtained by the power grid from the power source end. According to the principle of reactive power balance, the reactive current in the power grid decreases, and the total current in the line also decreases accordingly, improving the power factor and reducing the power loss in the line at the same time. Since the line current decreases, the line voltage drop also decreases, which helps to improve the voltage quality and enhance the operation stability of the power grid. Moreover, reactive power compensation reduces the load current of the transformer, extends the service life of the transformer, and reduces the maintenance cost of the equipment. Brief Description of the Drawings

[0025] Figure 1 is a schematic diagram of the system structure of the present invention;

[0026] Figure 2 is a schematic diagram of the system structure of the present invention;

[0027] Figure 3 is an axonometric partial structural view of the connection between the first housing and the storage cylinder, etc.;

[0028] Figure 4 is an axonometric partial structural view of the connection between the cover body and the discharge pipe, etc.;

[0029] Figure 5 is an axonometric partial structural view of the connection between the storage cylinder and the box body, etc.;

[0030] Figure 6 is an axonometric partial structural view of the connection between the storage cylinder and the feed interface, etc.;

[0031] Figure 7 is an axonometric partial structural view of the connection between the spline sleeve and the impeller, etc.;

[0032] Figure 8 is an axonometric partial structural view of the connection between the second inner shell and the first fin, etc.;

[0033] Figure 9 is an axonometric partial structural view of the connection between the cover body and the second positioning ring, etc.;

[0034] Figure 10 is an axonometric partial structural view of the connection between the pump body and the second delivery pipe, etc.;

[0035] Figure 11 is an axonometric partial structural view of the connection between the first housing and the first inner shell, etc.

[0036] Reference numerals in the drawings: 101, first housing; 102, closing door; 103, first inner housing; 104, storage cylinder; 105, feed interface; 106, cover body; 107, discharge pipe; 108, exhaust pipe; 201, box body; 202, first conveying pipe; 203, spline sleeve; 204, spline shaft; 205, sealing plate; 206, sealing ring; 207, spiral blade; 208, impeller; 301, bracket; 302, telescopic rod; 303, spring; 304, support seat; 305, support sleeve; 401, second housing; 402, second inner housing; 403, first fin; 404, semiconductor refrigeration plate; 405, second fin; 406, fan; 501, storage tank; 502, second conveying pipe; 503, pump body; 504, valve; 601, first positioning ring; 602, second positioning ring. Detailed implementation manners

[0037] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0038] Embodiment 1

[0039] A low-voltage power grid reactive power compensation system of the present invention includes a reactive power acquisition unit, a data processing unit, an intelligent control unit, a compensation unit, and a feedback unit;

[0040] The reactive power acquisition unit uses the acquisition module and the monitoring module to monitor and acquire the parameters of the reactive power, voltage, and current in the power grid in real time. By collecting these data, it is convenient to provide an evaluation and basis for the operation state of the power grid and the formulation of compensation strategies; by monitoring the voltage and current signals in the low-voltage power grid in real time, the active power, reactive power, and power factor parameters of the power grid are calculated;

[0041] The data processing unit is used to analyze the parameters of the reactive power, voltage, and current in the acquired power grid to determine whether there is a demand for reactive power or an excess situation in the power grid;

[0042] The intelligent control unit is used to formulate a compensation strategy according to the parameter analysis result of the power information by the data processing unit when compensation is required; according to the reactive power demand monitored in real time and the actual situation of the power grid, the intelligent control unit calculates the required compensation amount, which is the reactive power that the power grid system needs to provide or absorb, so as to balance the reactive power demand in the power grid. At the same time, the formulation of the compensation strategy comprehensively analyzes the stability, safety, and economy of the power grid pressure to improve the effectiveness and rationality of the compensation;

[0043] The compensation unit is used to control the operation of the compensation device, so that the compensation device can achieve the required compensation amount. When the intelligent control unit determines the compensation strategy, the intelligent control unit sends the compensation strategy to the compensation unit. The compensation unit controls the switching of the capacitor bank using the set switching decision and adjusts the operation of the reactor to provide or absorb the corresponding reactive power, so as to achieve the accuracy and stability of the required compensation amount and keep the power factor of the power grid within the set range. When it is monitored that the power factor is lower than the set value, the compensation unit issues a switching instruction to the switching device according to the magnitude of the reactive power and the capacity of the capacitor bank. If the reactive power is large and a large-capacity capacitor bank needs to be put into operation, the switching device will put the corresponding capacitor into the power grid according to the instruction. On the contrary, when the reactive power decreases and the power factor rises to a certain extent, the switching device will cut off some or all of the capacitors from the power grid.

[0044] The feedback unit is used to feedback the power factor of the power grid in real time and adjust the compensation in time. During the compensation process, the feedback unit continuously monitors the reactive power, voltage and current parameters of the power grid after compensation to ensure that the compensation effect meets the expectations. When it is detected that the compensation effect is not ideal or the power grid state changes, the feedback unit will send information to the intelligent control unit in time, so that the compensation unit adjusts the compensation strategy to ensure the stable operation of the power grid.

[0045] It also includes a protection unit;

[0046] The protection unit is used to monitor the voltage and current conditions during the operation of the power grid in real time. When abnormal current or voltage appears in the power grid, by sending information to the intelligent control unit, the intelligent control unit controls the operation of the compensation unit. Through the switching of the capacitor bank and the timely adjustment of the reactor by the compensation unit, overcurrent protection, overvoltage protection and undervoltage protection of the power grid are realized, the damage of the capacitor bank and other equipment is reduced, and the safe and reliable operation of the reactive power compensation system is improved.

[0047] The protection unit also includes a safety unit;

[0048] The safety unit is used to protect the electrical components in the low-voltage power grid reactive power compensation system, and by monitoring the temperature and smoke of the electrical components, it provides reliable and effective fire extinguishing and cooling protection for them.

[0049] It also includes a communication unit;

[0050] The communication unit is used to realize data transmission and remote control between the units of the system, improving the reliability and flexibility of the system

[0051] In this embodiment, after the capacitor bank is put into operation, the capacitors supply reactive power to the power grid, thereby reducing the reactive power obtained by the power grid from the power supply end. According to the principle of reactive power balance, the reactive current in the power grid decreases, and the total current in the line also decreases accordingly, improving the power factor and at the same time reducing the power loss in the line. Since the line current decreases, the line voltage drop also decreases, which helps to improve the voltage quality and enhance the operation stability of the power grid. Moreover, reactive power compensation reduces the load current of the transformer, extends the service life of the transformer, and reduces the equipment maintenance cost.

[0052] Embodiment 2

[0053] Based on Embodiment 1, a low-voltage power grid reactive power compensation system of the present invention, the safety unit includes a conveying device, a cooling device, a first housing 101, a closing door 102, a first inner housing 103, a storage cylinder 104, a feeding interface 105, a cover body 106, a plurality of discharge pipes 107 and an exhaust pipe 108. The first inner housing 103 is installed on the inner side wall of the first housing 101, and a chamber is provided between the first inner housing 103 and the first housing 101. A medium-boiling-point evaporation medium is provided in the chamber. The closing door 102 is installed at the operation port of the first inner housing 103. The storage cylinder 104 is installed at the top of the first housing 101. The bottom opening of the storage cylinder 104 extends into the inside of the first inner housing 103. The feeding interface 105 is communicatively connected to the upper part of the outer side wall of the storage cylinder 104. The cover body 106 is rotatably and slidably installed on the outer side wall of the storage cylinder 104, and the cover body 106 communicates with the bottom end of the storage cylinder 104. A plurality of discharge pipes 107 are all communicatively connected to the outer side wall of the cover body 106. A plurality of discharge ports are respectively provided at the lower parts of the outer side walls of the plurality of discharge pipes 107. The conveying device is arranged on the storage cylinder 104 and is used to feed dry powder fire extinguishing agent and carbon dioxide gas into the inside of the first inner housing 103. The exhaust pipe 108 is communicatively connected to the lower part of the outer side wall of the first inner housing 103. The cooling device is arranged on the first housing 101 and is used to cool the medium-boiling-point evaporation medium.

[0054] The conveying device includes an air intake device, a support device, a box body 201, a first conveying pipe 202, a spline sleeve 203, a spline shaft 204, a sealing plate 205, a sealing ring 206, a spiral blade 207, and an impeller 208. The box body 201 is installed at the top of the storage cylinder 104. The box body 201 is communicated with the air intake device. The air intake device is used to convey carbon dioxide gas into the box body 201. The input end of the first conveying pipe 202 is communicated with the box body 201, and the output end of the first conveying pipe 202 is communicated with the storage cylinder 104. The spline sleeve 203 is rotatably installed inside the box body 201. The upper part of the spline shaft 204 is slidably installed at the bottom of the spline sleeve 203. The bottom end of the spline shaft 204 is connected to the inner side wall of the cover body 106. The sealing plate 205 is installed on the outer side wall of the spline shaft 204. The sealing ring 206 is installed on the inner side wall of the storage cylinder 104, and the sealing plate 205 is in contact with the sealing ring 206. The spiral blade 207 is installed on the outer side wall of the spline shaft 204. The support device is arranged inside the storage cylinder 104 and is used to provide an upward elastic support force for the spline shaft 204. The impeller 208 is installed on the outer side wall of the spline sleeve 203;

[0055] The support device includes a bracket 301, a telescopic rod 302, a spring 303, a support seat 304, and a support sleeve 305. The bracket 301 is installed on the inner side wall of the storage cylinder 104. Multiple groups of telescopic rods 302 are installed at the top of the bracket 301. Multiple groups of springs 303 are respectively sleeved on the outer side walls of the multiple groups of telescopic rods 302. The support seat 304 is installed at the top of the multiple groups of telescopic rods 302. The support sleeve 305 is installed on the outer side wall of the spline shaft 204. The bottom end of the support sleeve 305 is rotatably connected to the top end of the support seat 304;

[0056] The cooling device includes a second housing 401, a second inner housing 402, a first fin 403, a semiconductor refrigeration plate 404, a second fin 405, and a fan 406. The second housing 401 is installed at the top of the first housing 101. The second inner housing 402 is arranged inside the second housing 401, and the bottom end of the second inner housing 402 is communicated with the chamber. Cooling water is arranged inside the second housing 401. The second inner housing 402 is immersed in the cooling water. Multiple groups of first fins 403 are arranged on the outer side wall of the second inner housing 402. The semiconductor refrigeration plate 404 is installed on the outer side wall of the second housing 401, and the refrigerating end of the semiconductor refrigeration plate 404 is communicated with the inside of the second housing 401. Multiple groups of second fins 405 are arranged on the heat dissipation end of the semiconductor refrigeration plate 404. The fan 406 is installed on the outer side wall of the second housing 401;

[0057] The intake device includes a storage tank 501, a second delivery pipe 502, a pump body 503, and a valve 504. The input end of the second delivery pipe 502 is connected to the storage tank 501, and the output end of the second delivery pipe 502 is connected to the box body 201. The pump body 503 is installed on the outer side wall of the first housing 101 and is communicatively disposed on the second delivery pipe 502. The valve 504 is communicatively disposed on the second delivery pipe 502;

[0058] It further includes a first positioning ring 601 and a second positioning ring 602. The first positioning ring 601 is installed on the outer side wall of the storage cylinder 104, and the second positioning ring 602 is installed on the outer side wall of the cover body 106. Grooves are respectively provided on the first positioning ring 601 and the second positioning ring 602, and the first positioning ring 601 and the second positioning ring 602 are cooperatively disposed through the grooves;

[0059] In this embodiment, the electrical components in the low-voltage power grid reactive power compensation system are installed inside the first inner shell 103. The medium-low boiling point evaporation medium in the chamber keeps the first inner shell 103 at a certain low temperature, so that the first inner shell 103 cools down the internal electrical components, improves the cooling and constant temperature effect of the first inner shell 103 on the electrical components, and improves the stability of temperature control. The medium-low boiling point evaporation medium evaporated by heat in the chamber enters the inside of the cooling device. After the medium-low boiling point evaporation medium is cooled by the cooling device, it condenses into a liquid again. The liquid flows back into the chamber for continuous use, improving the circulating cooling and temperature reduction effect and reducing the cooling energy consumption. The dry powder fire extinguishing agent is stored inside the storage cylinder 104. When a fire occurs inside the first inner shell 103, carbon dioxide gas is transported into the storage cylinder 104 through the conveying device. After being mixed with the dry powder fire extinguishing agent, it is transported into multiple groups of discharge pipes 107. The fire extinguishing agent is discharged into the first inner shell 103 through the multiple groups of discharge pipes 107, improving the fire extinguishing efficiency inside the first inner shell 103 and the safety of fire extinguishing. When the intake device transports carbon dioxide gas through the inside of the box body 201, the carbon dioxide gas drives the impeller 208 to rotate. After the impeller 208 rotates, it drives the spline sleeve 203 to rotate. The rotation of the spline sleeve 203 drives the spline shaft 204 to rotate, so that the spline shaft 204 drives the spiral blade 207 and the cover body 106 to rotate. After the spiral blade 207 rotates, it transports the dry powder fire extinguishing agent in the storage cylinder 104 downward. After the cover body 106 rotates, it drives the multiple groups of discharge pipes 107 to move circumferentially. At the same time, since the carbon dioxide gas is transported into the storage cylinder 104 through the first conveying pipe 202, the air pressure pushes the sealing plate 205 downward, so that the carbon dioxide gas and the dry powder fire extinguishing agent in the storage cylinder 104 are discharged downward through the gap between the sealing plate 205 and the sealing ring 206. The discharged mixed fire extinguishing agent is transported into the first inner shell 103 for fire extinguishing, improving the fire extinguishing efficiency. By moving the multiple groups of discharge pipes 107 circumferentially, the spraying uniformity and comprehensiveness of the fire extinguishing agent are improved, and the fire extinguishing effect is improved. The medium-low boiling point evaporation medium evaporated in the chamber enters the second inner shell 402 upward. The cooling water in the second housing 401 is cooled by the semiconductor refrigeration plate 404, so that the cooling water cools the second inner shell 402, and the second inner shell 402 cools and condenses the medium-low boiling point evaporation medium evaporated inside. The condensed medium-low boiling point evaporation medium flows back into the chamber, so as to achieve the cooling and constant temperature effect on the electrical components in the first inner shell 103 and improve the stability of temperature control.

[0060] As Figures 1 to 11As shown in the figure, in a reactive power compensation system for a low-voltage power grid of the present invention, when it works, electrical components in the reactive power compensation system for the low-voltage power grid are installed inside the first inner shell 103. The first inner shell 103 is maintained at a certain low temperature by a medium-boiling-point evaporation medium in the chamber, so that the first inner shell 103 cools down the electrical components inside. The medium-boiling-point evaporation medium heated and evaporated in the chamber enters the cooling device. After being cooled by the cooling device, the medium-boiling-point evaporation medium condenses into a liquid again, and the liquid flows back to the chamber for continued use. Dry powder fire extinguishing agent is stored inside the storage cylinder 104. When a fire occurs inside the first inner shell 103, carbon dioxide gas is transported into the storage cylinder 104 through the transport device. After being mixed with the dry powder fire extinguishing agent, it is transported into multiple groups of discharge pipes 107, and the fire extinguishing agent is discharged into the first inner shell 103 through the multiple groups of discharge pipes 107.

[0061] The main functions achieved by the present invention are as follows: it helps to improve the voltage quality, enhance the operation stability of the power grid, and reactive power compensation reduces the load current of the transformer, extends the service life of the transformer, and reduces the equipment maintenance cost;

[0062] It improves the circulating cooling effect, reduces the cooling energy consumption, and by using a mixture of carbon dioxide gas and dry powder fire extinguishing agent, it improves the fire extinguishing efficiency and the fire extinguishing safety.

[0063] The semiconductor refrigeration plate 404, the fan 406 and the pump body 503 of the reactive power compensation system for a low-voltage power grid of the present invention are purchased on the market. Those skilled in the industry only need to install and operate them according to the attached operation manuals, without the need for creative labor from those skilled in the art.

[0064] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A low voltage power grid reactive power compensation system, characterized in that: It includes a reactive power acquisition unit, a data processing unit, an intelligent control unit, a compensation unit and a feedback unit; The reactive power acquisition unit uses the acquisition module and the monitoring module to monitor and collect the reactive power, voltage, and current parameters in the power grid in real time. By collecting these data, it is convenient to provide evaluation and basis for the operation status of the power grid and the formulation of compensation strategies; The data processing unit is used to analyze the collected parameters of reactive power, voltage and current in the power grid to determine whether there is a demand for reactive power or an excess of reactive power in the power grid; The intelligent control unit is used to formulate a compensation strategy when compensation is needed based on the parameter analysis result of the power information by the data processing unit; The compensation unit is used to control the operation of the compensation device so that the compensation device can achieve the required compensation amount. After the intelligent control unit determines the compensation strategy, the intelligent control unit sends the compensation strategy to the compensation unit. The compensation unit uses the set switching decision to control the switching of the capacitor bank and adjusts the operation of the reactor to provide or absorb the corresponding reactive power to achieve the accuracy and stability of the required compensation amount and keep the power factor of the power grid within the set range. The feedback unit is used to feed back the power factor of the power grid in real time and adjust the compensation in time.

2. A low voltage power grid reactive power compensation system as claimed in claim 1, characterized in that: Also includes protection unit; The protection unit is used to monitor the voltage and current conditions of the power grid in real time during operation. When abnormal current or voltage occurs in the power grid, the information is sent to the intelligent control unit, which controls the operation of the compensation unit. The compensation unit switches on and off the capacitor bank and adjusts the reactor in time to achieve overcurrent protection, overvoltage protection and undervoltage protection of the power grid, reduce damage to the capacitor bank and other equipment, and improve the safe and reliable operation of the reactive power compensation system.

3. A low voltage power grid reactive power compensation system as claimed in claim 2, characterized in that: The protection unit also includes a safety unit; The safety unit is used to protect the electrical components in the reactive power compensation system of the low-voltage power grid, and provides reliable and effective fire extinguishing and cooling protection by monitoring the temperature and smoke of the electrical components.

4. A low voltage power grid reactive power compensation system as claimed in claim 1, characterized in that: Also included is a communication unit; The communication unit is used to realize data transmission and remote control between various units of the system, improving the reliability and flexibility of the system.

5. A low voltage power grid reactive power compensation system as claimed in claim 3, characterized in that: The safety unit comprises a conveying device, a cooling device, a first shell (101), a closed door (102), a first inner shell (103), a storage cylinder (104), a feed interface (105), a cover (106), a plurality of discharge pipes (107) and an exhaust pipe (108); the first inner shell (103) is mounted on the inner side wall of the first shell (101), and a chamber is arranged between the first inner shell (103) and the first shell (101); a medium-low boiling point evaporation medium is arranged in the chamber; the closed door (102) is mounted at the operating port of the first inner shell (103); the storage cylinder (104) is mounted at the top end of the first shell (101); the bottom end opening of the storage cylinder (104) extends into the interior of the first inner shell (103); the feed interface (106) is arranged on the inner side wall of the first shell (101); a chamber is arranged between the first inner shell (103) and the first shell (101); a medium-low boiling point evaporation medium is arranged in the chamber; the closed door (102) is mounted at the operating port of the first inner shell (103); the storage cylinder (104) is mounted at the top end of the first shell (101); the bottom end opening of the storage cylinder (104) extends into the interior of the first inner shell (103); and the feed interface (106) is arranged on the inner side wall of the first shell (101). 05) is connected and arranged on the upper part of the outer wall of the storage cylinder (104), the cover body (106) is rotatably and slidably installed on the outer wall of the storage cylinder (104), and the cover body (106) is connected to the bottom end of the storage cylinder (104), multiple groups of discharge pipes (107) are connected and arranged on the outer wall of the cover body (106), and multiple groups of discharge ports are respectively arranged at the lower part of the outer wall of the multiple groups of discharge pipes (107). A conveying device is arranged on the storage cylinder (104), and the conveying device is used to bring the dry powder fire extinguishing agent and carbon dioxide gas into the first inner shell (103). The exhaust pipe (108) is connected and arranged on the lower part of the outer wall of the first inner shell (103). A cooling device is arranged on the first shell (101), and the cooling device is used to cool the medium and low boiling point evaporating medium.

6. A low voltage power grid reactive power compensation system as claimed in claim 5, characterized in that: The delivery device comprises an air intake device, a support device, a box (201), a first delivery pipe (202), a spline sleeve (203), a spline shaft (204), a sealing plate (205), a sealing ring (206), a spiral blade (207) and an impeller (208); the box (201) is mounted on the top of the storage cylinder (104); the box (201) is connected to the air intake device; the air intake device is used to deliver carbon dioxide gas to the inside of the box (201); the input end of the first delivery pipe (202) is connected to the box (201); the output end of the first delivery pipe (202) is connected to the storage cylinder (104); the spline sleeve (203) is rotatably mounted on the box (201) 01), the upper part of the spline shaft (204) is slidably mounted on the bottom of the spline sleeve (203), the bottom end of the spline shaft (204) is connected to the inner wall of the cover body (106), the sealing plate (205) is mounted on the outer wall of the spline shaft (204), the sealing ring (206) is mounted on the inner wall of the storage cylinder (104), and the sealing plate (205) is in contact with the sealing ring (206), the spiral blade (207) is mounted on the outer wall of the spline shaft (204), the supporting device is arranged inside the storage cylinder (104), the supporting device is used to provide an upward elastic supporting force to the spline shaft (204), and the impeller (208) is mounted on the outer wall of the spline sleeve (203).

7. A low voltage power grid reactive power compensation system as claimed in claim 6, characterized in that: The support device comprises a bracket (301), a telescopic rod (302), a spring (303), a support seat (304) and a support sleeve (305); the bracket (301) is mounted on the inner wall of the storage tube (104); the plurality of telescopic rods (302) are mounted on the top of the bracket (301); the plurality of springs (303) are respectively fitted on the outer walls of the plurality of telescopic rods (302); the support seat (304) is mounted on the top of the plurality of telescopic rods (302); the support sleeve (305) is mounted on the outer wall of the spline shaft (204); and the bottom end of the support sleeve (305) is rotatably connected to the top end of the support seat (304).

8. A low voltage power grid reactive power compensation system as claimed in claim 5, characterized in that: The cooling device comprises a second shell (401), a second inner shell (402), first fins (403), a semiconductor refrigeration plate (404), second fins (405) and a fan (406); the second shell (401) is mounted on the top of the first shell (101); the second inner shell (402) is arranged inside the second shell (401), and the bottom of the second inner shell (402) is communicated with the chamber; cooling water is arranged inside the second shell (401), and the second inner shell (402) is immersed in the cooling water; a plurality of groups of first fins (403) are arranged on the outer wall of the second inner shell (402); the semiconductor refrigeration plate (404) is mounted on the outer wall of the second shell (401), and the cooling end of the semiconductor refrigeration plate (404) is communicated with the inside of the second shell (401); a plurality of groups of second fins (405) are arranged on the heat dissipation end of the semiconductor refrigeration plate (404); and the fan (406) is mounted on the outer wall of the second shell (401).

9. A low voltage power grid reactive power compensation system as claimed in claim 6, characterized in that: The air intake device comprises a storage tank (501), a second delivery pipe (502), a pump body (503) and a valve (504); the input end of the second delivery pipe (502) is connected to the storage tank (501); the output end of the second delivery pipe (502) is connected to the box body (201); the pump body (503) is installed on the outer wall of the first shell (101); the pump body (503) is connected to the second delivery pipe (502); and the valve (504) is connected to the second delivery pipe (502).

10. A low voltage power grid reactive power compensation system as claimed in claim 5, characterized in that: The invention also comprises a first positioning ring (601) and a second positioning ring (602), wherein the first positioning ring (601) is mounted on the outer wall of the storage tube (104), and the second positioning ring (602) is mounted on the outer wall of the cover body (106), and the first positioning ring (601) and the second positioning ring (602) are respectively provided with grooves, and the first positioning ring (601) and the second positioning ring (602) are arranged in cooperation with each other through the grooves.

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