Intelligent low-voltage harmonic suppression reactive compensation capacitor and use method

Abstract

The invention provides an intelligent low-voltage harmonic suppression reactive compensation capacitor and a using method, the reactive compensation capacitor comprises a capacitor shell, a capacitor bank and a controller, the capacitor bank is installed in the capacitor shell, the upper end part of the capacitor shell is provided with a wiring terminal, and the bottom of an inner cavity of the capacitor shell is provided with a control box; the reactive compensation capacitor is novel in structural design and convenient to use, the harmonic resistance can be improved, in addition, the reactive compensation capacitor has the functions of overheating protection and power-off starting to prevent burnout, and the use safety of the reactive compensation capacitor is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, and in particular to an intelligent low-voltage harmonic suppression reactive power compensation capacitor and a use method thereof. Background Art

[0002] The role of reactive power compensation device in electronic power supply system is to improve the power factor of power grid, reduce the loss of power supply transformer and transmission line, improve power supply efficiency, improve power supply environment, meet the voltage level and economic operation requirements of power grid load end, so reactive power compensation device is in an indispensable and very important position in power supply system. Reasonable selection of compensation device can reduce the transmission of reactive power, thereby reducing voltage drop, minimizing network loss, improving power grid quality, and having good economic effect. On the contrary, improper selection or use may cause voltage fluctuation of power supply system. In low-voltage power distribution system, due to the large number of reactive loads such as distribution transformers and low-voltage electrical equipment, the network loss increases and the voltage quality decreases, which seriously affects the safe and reliable operation of low-voltage power grid. With the power supply department's emphasis on power distribution construction and the development of reactive compensation technology, as well as the current power shortage, low-voltage reactive compensation technology has been more and more widely used in power distribution system, and has been used as an effective measure for loss reduction and voltage regulation in the transformation of two networks in recent years.

[0003] Reactive power compensation capacitors play a vital role in power systems. They are mainly used to compensate for reactive power in power systems, improve the power factor of power systems, reduce energy waste, and improve the efficiency and stability of equipment. By connecting capacitive elements in parallel, reactive power compensation capacitors are able to provide reactive power in the power grid and compensate for the reactive power deficiency of the power system. This helps maintain the voltage level in the power system, reduce the voltage fluctuation range, and improve the stability of the power system. In addition, reactive power compensation capacitors can also reduce the flow of reactive power on the line, thereby reducing line losses and improving the operating efficiency and stability of the power system.

[0004] At present, there are many similar products running in the power distribution system, including intelligent reactive power compensation capacitors developed by major manufacturers. Although the working principles are similar, the intelligence level of reactive power compensation capacitors of various manufacturers is different, and the technological innovation is also different. It is often the case that capacitors with low intelligence level cannot achieve good reactive power compensation effect in the power distribution system. Therefore, it is necessary to design an intelligent low-voltage harmonic suppression reactive power compensation capacitor. Summary of the invention

[0005] The present invention provides an intelligent low-voltage harmonic suppression reactive power compensation capacitor and a use method to solve the problems of poor harmonic resistance and poor self-protection effect of the prior art capacitor, thereby improving the harmonic resistance capability. In addition, it also has the functions of overheat protection and power-off start-up to prevent burning, thereby ensuring the safety of the reactive power compensation capacitor.

[0006] The present invention provides an intelligent low-voltage harmonic suppression reactive power compensation capacitor, the reactive power compensation capacitor comprising a capacitor housing, a capacitor bank and a controller;

[0007] The capacitor group is installed in a capacitor housing, and a wiring terminal is installed at the upper end of the capacitor housing;

[0008] A control box is installed at the bottom of the inner cavity of the capacitor housing, and the controller is installed in the control box.

[0009] Preferably, the capacitor group adopts a harmonic suppression separate compensation intelligent low-voltage power capacitor or a harmonic suppression common compensation intelligent low-voltage power capacitor, and the capacitor group is connected to the wiring terminals and the controller.

[0010] Preferably, a self-protection module is also installed in the capacitor housing, and the self-protection module is respectively connected to the capacitor bank and the controller.

[0011] Preferably, the self-protection module includes a switch, a triode, a first field effect transistor, a bidirectional trigger diode and a bidirectional thyristor, the base of the triode is respectively connected to the cathode of diode B and one end of resistor D, the collector is respectively connected to the gate of the first field effect transistor and one end of resistor B, the emitter of the triode is respectively connected to the source of the first field effect transistor and the other end of resistor D, the drain of the first field effect transistor is respectively connected to the cathode of diode C and one end of capacitor B, the other end of capacitor B is respectively connected to one end of the bidirectional trigger diode and one end of resistor E, the other end of resistor E is connected to one end of the bidirectional thyristor, the other end of the bidirectional thyristor is respectively connected to the other end of the bidirectional trigger diode and the emitter of the triode, the positive electrode of diode C is respectively connected to one end of resistor A and the positive electrode of diode B, the other end of resistor A is connected to one end of the switch, the other end of the switch is connected to the positive electrode of diode A, the negative electrode of diode A is connected in series with resistor B and capacitor A, and resistor C is connected in parallel at both ends of capacitor A.

[0012] Preferably, it also includes a temperature sensor, which is installed on the inner wall of the capacitor housing, connected to the controller, and used to collect the working temperature of the capacitor group in the capacitor housing.

[0013] Preferably, an overheating protection module is provided in the controller, and the overheating protection module includes a controllable precision voltage source, a transistor, a resistor F, a resistor G, a resistor H and a capacitor C, one end of the controllable precision voltage source is respectively connected to one end of the resistor H and one end of the capacitor C, the other end of the controllable precision voltage source is respectively connected to one end of the resistor F and one end of the resistor G, the other end of the resistor G and the other end of the resistor H are respectively connected to one end of the capacitor C and the base of the transistor, the emitter of the transistor is grounded, and the collector is connected to the temperature sensor.

[0014] Preferably, a display screen and a switch are respectively installed on the outer wall of the capacitor housing, and the display screen and the switch are respectively connected to a controller.

[0015] Preferably, a method for using an intelligent low-voltage harmonic suppression reactive power compensation capacitor comprises the following steps:

[0016] A. Connect the wiring terminals on the top of the capacitor housing to the power grid;

[0017] B. The harmonic suppression separate compensation intelligent low-voltage power capacitor or harmonic suppression common compensation intelligent low-voltage power capacitor in the capacitor shell can perform low-voltage harmonic suppression reactive compensation;

[0018] C. The temperature sensor collects the operating temperature of the capacitor bank in real time and feeds it back to the controller;

[0019] D. Once the operating temperature is too high, the overheat protection module will start, which can automatically adjust the output current, reduce the heat generated by the capacitor bank, and further play a protective role;

[0020] E. When the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode quickly turns on and triggers the bidirectional thyristor to also turn on, protecting the subsequent load from overvoltage damage.

[0021] Beneficial effects:

[0022] (1) The present invention has novel structural design and is easy to use. The capacitor bank adopts harmonic suppression and separate compensation intelligent low-voltage power capacitors or harmonic suppression and common compensation intelligent low-voltage power capacitors, which can improve the anti-harmonic capability. In addition, it also has the functions of overheating protection and power-off start-up to prevent burning, ensuring the safety of the use of reactive power compensation capacitors.

[0023] (2) In the self-protection module adopted by the present invention, the overvoltage protection circuit composed of a bidirectional trigger diode and a bidirectional thyristor is such that when the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode is quickly turned on and triggers the bidirectional thyristor to also turn on, thereby protecting the subsequent load from overvoltage damage, preventing the switching power supply from burning out due to the instantaneous high current when it is turned on after power failure, and avoiding energy waste and the occurrence of safety accidents.

[0024] (3) The overheat protection module used in the present invention can automatically adjust the output current, reduce the heat generated by the capacitor group, and further play a protective role.

[0025] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a control principle block diagram of the present invention;

[0029] Figure 3 This is a schematic diagram of the self-protection module of the present invention;

[0030] Figure 4 This is a schematic diagram of the overheat protection module of the present invention;

[0031] Figure 5 It is the work flow chart of the present invention;

[0032] Explanation of the accompanying drawings: capacitor housing 1, capacitor group 2, controller 3, terminal 4, control box 5, self-protection module 6, switch 7, transistor 8, first field effect transistor 9, bidirectional trigger diode 10, bidirectional thyristor 11, temperature sensor 12, overheat protection module 13, controllable precision voltage source 14, transistor 15. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification, claims and accompanying drawings of the present invention are intended to cover non-exclusive inclusions.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase "embodiments" in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present invention. For example, in the description of the present invention, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0037] In addition, the expressions of indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0038] In addition, the terms "first", "second", etc. in the description and claims of the present invention or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0041] Embodiment 1:

[0042] See also Figure 1-Figure 3 , the present invention discloses an intelligent low-voltage harmonic suppression reactive power compensation capacitor, the reactive power compensation capacitor comprises a capacitor housing 1, a capacitor bank 2 and a controller 3;

[0043] The capacitor bank 2 is installed in the capacitor housing 1, and the upper end of the capacitor housing 1 is installed with a wiring terminal 4;

[0044] A control box 5 is installed at the bottom of the inner cavity of the capacitor housing 1 , and the controller 3 is installed in the control box 5 .

[0045] The capacitor bank 2 adopts a harmonic suppression separate compensation intelligent low-voltage power capacitor or a harmonic suppression common compensation intelligent low-voltage power capacitor, and the capacitor bank is connected to the wiring terminal and the controller. The harmonic suppression separate compensation intelligent low-voltage power capacitor or the harmonic suppression common compensation intelligent low-voltage power capacitor can effectively suppress harmonics.

[0046] In the present invention, a self-protection module 6 is further installed in the capacitor housing 1, and the self-protection module 6 is respectively connected to the capacitor group 2 and the controller 3; the self-protection module 6 includes a switch 7, a triode 8, a first field effect transistor 9, a bidirectional trigger diode 10 and a bidirectional thyristor 11, the base of the triode 8 is respectively connected to the cathode of the diode B2b and one end of the resistor D4a, the collector is respectively connected to the gate of the first field effect transistor 9 and one end of the resistor B2a, the emitter of the triode 8 is respectively connected to the source of the first field effect transistor 9 and the other end of the resistor D4a, and the drain of the first field effect transistor 9 is respectively connected to the cathode of the diode B2b and one end of the resistor D4a. 3b cathode and one end of capacitor B2c, the other end of capacitor B2c is respectively connected to one end of bidirectional trigger diode 10 and one end of resistor E5a, the other end of resistor E5a is connected to one end of bidirectional thyristor 11, the other end of bidirectional thyristor 11 is respectively connected to the other end of bidirectional trigger diode 10 and the emitter of transistor 8, the anode of diode C3b is respectively connected to one end of resistor A1a and the anode of diode B2b, the other end of resistor A1a is connected to one end of the switch, the other end of the switch is connected to the anode of diode A1b, the cathode of diode A1b is connected in series with resistor B2a and capacitor A1c, and resistor C3a is connected in parallel at both ends of capacitor A1c, wherein, the anode of diode 1b and one end of capacitor 1c are connected to the power input end, the node connection between one end of resistor 1a and switch 7 and the node connection between bidirectional thyristor 11 and resistor 5a are connected to the voltage output end, when the bidirectional trigger diode and bidirectional thyristor form an overvoltage protection circuit. When the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode quickly conducts and triggers the bidirectional thyristor to conduct, protecting the subsequent load from overvoltage damage. It can prevent the switching power supply from burning out due to the instantaneous high current when it is turned on after power failure, avoiding energy waste and safety accidents.

[0047] Embodiment 2:

[0048] See also Figure 1-Figure 4 , the present invention discloses an intelligent low-voltage harmonic suppression reactive power compensation capacitor, the reactive power compensation capacitor comprises a capacitor housing 1, a capacitor bank 2 and a controller 3;

[0049] The capacitor bank 2 is installed in the capacitor housing 1, and the upper end of the capacitor housing 1 is installed with a wiring terminal 4;

[0050] A control box 5 is installed at the bottom of the inner cavity of the capacitor housing 1, and the controller 3 is installed in the control box 5. A display screen 17 and a switch 18 are installed on the outer wall of the capacitor housing 1, respectively, and the display screen 17 and the switch 18 are connected to the controller 3 respectively.

[0051] The capacitor bank 2 adopts a harmonic suppression separate compensation intelligent low-voltage power capacitor or a harmonic suppression common compensation intelligent low-voltage power capacitor, and the capacitor bank is connected to the wiring terminal and the controller. The harmonic suppression separate compensation intelligent low-voltage power capacitor or the harmonic suppression common compensation intelligent low-voltage power capacitor can effectively suppress harmonics.

[0052] In the present invention, a self-protection module 6 is further installed in the capacitor housing 1, and the self-protection module 6 is respectively connected to the capacitor group 2 and the controller 3; the self-protection module 6 includes a switch 7, a triode 8, a first field effect transistor 9, a bidirectional trigger diode 10 and a bidirectional thyristor 11, the base of the triode 8 is respectively connected to the cathode of the diode B2b and one end of the resistor D4a, the collector is respectively connected to the gate of the first field effect transistor 9 and one end of the resistor B2a, the emitter of the triode 13 is respectively connected to the source of the first field effect transistor 9 and the other end of the resistor D4a, and the drain of the first field effect transistor 9 is respectively connected to the diode C 3b cathode and one end of capacitor B2c, the other end of capacitor B2c is respectively connected to one end of bidirectional trigger diode 10 and one end of resistor E5a, the other end of resistor E5a is connected to one end of bidirectional thyristor 11, the other end of bidirectional thyristor 11 is respectively connected to the other end of bidirectional trigger diode 10 and the emitter of transistor 8, the anode of diode C3b is respectively connected to one end of resistor A1a and the anode of diode B2b, the other end of resistor A1a is connected to one end of the switch, the other end of the switch is connected to the anode of diode A1b, the cathode of diode A1b is connected in series with resistor B2a and capacitor A1c, and resistor C3a is connected in parallel at both ends of capacitor A1c, wherein, the anode of diode 1b and one end of capacitor 1c are connected to the power input end, the node connection between one end of resistor 1a and switch 12 and the node connection between bidirectional thyristor 11 and resistor 5a are connected to the voltage output end, when the bidirectional trigger diode and bidirectional thyristor form an overvoltage protection circuit. When the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode quickly conducts and triggers the bidirectional thyristor to conduct, protecting the subsequent load from overvoltage damage. It can prevent the switching power supply from burning out due to the instantaneous high current when it is turned on after power failure, avoiding energy waste and safety accidents.

[0053] This embodiment also includes a temperature sensor 12, which is installed on the inner wall of the capacitor housing 1. The temperature sensor 12 is connected to the controller 3 and is used to collect the working temperature of the capacitor group in the capacitor housing. An overheating protection module 13 is arranged in the controller 3, and the overheating protection module 13 includes a controllable precision voltage source 14, a transistor 15, a resistor F6a, a resistor G7a, a resistor H8a and a capacitor C3c. One end of the controllable precision voltage source 14 is respectively connected to one end of the resistor H8a and one end of the capacitor C3c, and the other end of the controllable precision voltage source 14 is respectively connected to one end of the resistor F6a and one end of the resistor G7a, and the other end of the resistor G7a and the other end of the resistor H8a are respectively connected to one end of the capacitor C3c and the base of the transistor 15. The emitter of the transistor 15 is grounded, and the collector is connected to the temperature sensor 12. If the temperature sensor detects that the temperature is in an abnormal state, the transistor 15 is turned on, and the controllable precision voltage source 14 automatically adjusts the output current to reduce the heat generated by the appliance. The overheat protection module used in the present invention can automatically adjust the output current to reduce the heat generated by the capacitor group, thereby further playing a protective role.

[0054] Working principle: A method for using an intelligent low-voltage harmonic suppression reactive power compensation capacitor includes the following steps:

[0055] A. Connect the wiring terminals on the top of the capacitor housing to the power grid;

[0056] B. The harmonic suppression separate compensation intelligent low-voltage power capacitor or harmonic suppression common compensation intelligent low-voltage power capacitor in the capacitor shell can perform low-voltage harmonic suppression reactive compensation;

[0057] C. The temperature sensor collects the operating temperature of the capacitor bank in real time and feeds it back to the controller;

[0058] D. Once the operating temperature is too high, the overheat protection module will start, which can automatically adjust the output current, reduce the heat generated by the capacitor bank, and further play a protective role;

[0059] E. When the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode quickly turns on and triggers the bidirectional thyristor to also turn on, protecting the subsequent load from overvoltage damage.

[0060] To sum up, the present invention has novel structural design and is easy to use. The capacitor bank adopts harmonic suppression and separate compensation intelligent low-voltage power capacitors or harmonic suppression and common compensation intelligent low-voltage power capacitors, which can improve the anti-harmonic ability. In addition, it also has the functions of overheating protection and power-off start-up to prevent burning, ensuring the safety of the use of reactive compensation capacitors.

[0061] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent low-voltage harmonic suppression reactive compensation capacitor, characterized in that: The reactive power compensation capacitor comprises a capacitor housing (1), a capacitor group (2) and a controller (3); The capacitor group (2) is installed in a capacitor housing (1), and a connection terminal (4) is installed on the upper end of the capacitor housing (1); A control box (5) is installed at the bottom of the inner cavity of the capacitor housing (1), and the controller (3) is installed in the control box (5).

2. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 1 is characterized in that: The capacitor group (2) adopts a harmonic suppression separate compensation intelligent low-voltage power capacitor or a harmonic suppression common compensation intelligent low-voltage power capacitor, and the capacitor group is connected to a wiring terminal and a controller.

3. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 1 is characterized in that: A self-protection module (6) is also installed in the capacitor housing (1), and the self-protection module (6) is respectively connected to the capacitor group (2) and the controller (3).

4. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 3 is characterized in that: The self-protection module (6) comprises a switch (7), a triode (8), a first field effect transistor (9), a bidirectional trigger diode (10) and a bidirectional thyristor (11); the base of the triode (8) is respectively connected to the cathode of a diode B (2b) and one end of a resistor D (4a); the collector is respectively connected to the gate of the first field effect transistor (9) and one end of the resistor B (2a); the emitter of the triode (13) is respectively connected to the source of the first field effect transistor (9) and the other end of the resistor D (4a); the drain of the first field effect transistor (9) is respectively connected to the cathode of a diode C (3b) and one end of a capacitor B (2c); the other end of the capacitor B (2c) is respectively connected to the cathode of a diode C (3b) and one end of a capacitor B (2c); One end of the bidirectional trigger diode (10) and one end of the resistor E (5a) are connected respectively, the other end of the resistor E (5a) is connected to one end of the bidirectional thyristor (11), the other end of the bidirectional thyristor (11) is respectively connected to the other end of the bidirectional trigger diode (10) and the emitter of the transistor (8), the anode of the diode C (3b) is respectively connected to one end of the resistor A (1a) and the anode of the diode B (2b), the other end of the resistor A (1a) is connected to one end of the switch, the other end of the switch is connected to the anode of the diode A (1b), the cathode of the diode A (1b) is connected in series with the resistor B (2a) and the capacitor A (1c), and the two ends of the capacitor A (1c) are connected in parallel with the resistor C (3a).

5. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 1 is characterized in that: It also comprises a temperature sensor (12), the temperature sensor (12) being mounted on the inner wall of the capacitor housing (1), the temperature sensor (12) being connected to the controller (3), and the temperature sensor (12) being used to collect the operating temperature of the capacitor group in the capacitor housing.

6. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 1 is characterized in that: An overheat protection module (13) is provided in the controller (3), and the overheat protection module (13) comprises a controllable precision voltage source (14), a transistor (15), a resistor F (6a), a resistor G (7a), a resistor H (8a) and a capacitor C (3c), one end of the controllable precision voltage source (14) is respectively connected to one end of the resistor H (8a) and one end of the capacitor C (3c), the other end of the controllable precision voltage source (14) is respectively connected to one end of the resistor F (6a) and one end of the resistor G (7a), the other end of the resistor G (7a) and the other end of the resistor H (8a) are respectively connected to one end of the capacitor C (3c) and the base of the transistor (15), the emitter of the transistor (15) is grounded, and the collector is connected to the temperature sensor (12).

7. The intelligent low-voltage harmonic suppression reactive compensation capacitor according to claim 1 is characterized in that: A display screen (17) and a switch (18) are respectively installed on the outer wall of the capacitor housing (1), and the display screen (17) and the switch (18) are respectively connected to the controller (3).

8. A method for using the intelligent low-voltage harmonic suppression reactive power compensation capacitor according to claim 1, characterized in that: The method of use includes the following steps: A. Connect the wiring terminals on the top of the capacitor housing to the power grid; B. The harmonic suppression separate compensation intelligent low-voltage power capacitor or harmonic suppression common compensation intelligent low-voltage power capacitor in the capacitor shell can perform low-voltage harmonic suppression reactive compensation; C. The temperature sensor collects the operating temperature of the capacitor bank in real time and feeds it back to the controller; D. Once the operating temperature is too high, the overheat protection module will start, which can automatically adjust the output current, reduce the heat generated by the capacitor bank, and further play a protective role; E. When the transient voltage exceeds the voltage at both ends, the bidirectional trigger diode quickly turns on and triggers the bidirectional thyristor to also turn on, protecting the subsequent load from overvoltage damage.

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