Stepless adjustable reactive compensation power capacitor and working method thereof

Abstract

The invention provides a stepless adjustable reactive compensation power capacitor and a working method thereof. A stepless adjustable reactive compensation power capacitor comprises a first capacitor plate, a second capacitor plate, a power mechanism and a capacitor shell, the power mechanism is used for driving the first capacitor plate to insert and separate relative to the second capacitor plate, the first capacitor plate is slidably mounted in the capacitor shell, and the second capacitor plate is slidably mounted in the capacitor shell. The second capacitor plate is installed in the capacitor shell, and the power mechanism is connected with the first capacitor plate.

Description

Technical Field

[0001] The invention relates to the technical field of reactive power compensation capacitors, and in particular to a steplessly adjustable reactive power compensation capacitor and a working method thereof. Background Art

[0002] With the development of new energy and the gradual advancement of electrification of power grid loads, the load structure is characterized by diversification, volatility and unpredictability, and the demand for reactive power compensation in substations is more urgent. In the field of medium-voltage compensation in power grids, substations still mainly use parallel capacitor switching. The difference in the configuration of capacitor bank capacity and the switching switch cannot adapt to the requirements of reactive power compensation under frequent voltage fluctuations. After frequent switching of capacitor banks of ordinary sulfur hexafluoride circuit breakers, there are problems such as excessive circuit resistance, heavy contact electrical erosion, and difficult scientific evaluation of electrical life; the low-current breaking process of vacuum circuit breakers has problems such as high cut-off overvoltage and delayed breakdown after arcing, which has a great impact on the application of capacitor bank switching in reactive power compensation. In order to better meet the system voltage and reactive power regulation requirements, a feasible way is to use stepless adjustable capacitors to avoid high-frequency inrush current, switching control strategy and other problems caused by the use of grouped capacitors. Using stepless adjustable capacitors for reactive power compensation to change the capacitance of power capacitors can accurately and conveniently make the system voltage and power factor meet the actual operation requirements without overcompensation. Although the currently common variable capacitors can change the capacitance value to a certain extent, the electromagnetic interference they generate, the large size and small capacity, and the short service life also make their use difficult. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a stepless adjustable reactive power compensation capacitor and a working method thereof in view of the deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a steplessly adjustable reactive compensation power capacitor, comprising: a first capacitor plate, a second capacitor plate, a power mechanism for driving the first capacitor plate to insert and separate relative to the second capacitor plate, and a capacitor housing, wherein the first capacitor plate is slidably installed in the capacitor housing, the second capacitor plate is installed in the capacitor housing, and the power mechanism is connected to the first capacitor plate.

[0005] The beneficial effects of the technical solution of the present invention are: in actual operation, the first capacitor plate is controlled to move in a plane parallel to the second capacitor plate by a power mechanism to achieve the change of the actual capacitance area and capacitance. Two wound metal films are used as plates, and in actual operation, the capacitance is changed by plugging the movable plates. While achieving stepless adjustment of the capacitance of the reactive compensation power capacitor, the volume can be kept small, avoiding the high-frequency inrush current and pre-breakdown arcing caused by the conventional switch closing capacitor operation.

[0006] Further, there is a gap between the first capacitor plate and the second capacitor plate, an insulating material is provided in the gap, and the first capacitor plate is located above the second capacitor plate.

[0007] The beneficial effect of adopting the above further technical solution is: it is easy to form a stepless and adjustable reactive power compensation power capacitor, ensuring that the plate gap is not broken down at a high voltage level.

[0008] Furthermore, the insulating material is transformer oil or silicone grease.

[0009] The beneficial effect of adopting the above further technical solution is: using transformer oil, silicone grease, etc. as insulating medium to ensure that the gap between the plates is not broken down under high voltage levels.

[0010] Furthermore, the first capacitor plate is connected to a first capacitor terminal via a conductive rod, the second capacitor plate is connected to a second capacitor terminal via a conductive rod, the first capacitor terminal and the second capacitor terminal are both located on the outside of the capacitor housing, the conductive rod between the first capacitor plate and the first capacitor terminal is slidably installed in the capacitor housing, and the power mechanism is connected to the conductive rod between the first capacitor plate and the first capacitor terminal via an insulating member.

[0011] The beneficial effect of adopting the above further technical solution is that the power mechanism realizes the position adjustment of the first capacitor plate relative to the second capacitor plate through the conductive rod between the first capacitor terminal and the first capacitor plate. The first capacitor plate is controlled to move in a vertical plane through the action of the power mechanism on the conductive rod to realize the partial overlap or separation of the two plates, thereby changing the size and capacitance of the area of ​​the part facing the plates. The first capacitor plate and the second capacitor plate use the first capacitor terminal and the second capacitor terminal as poles for wiring, respectively, which is convenient for the wiring of the steplessly adjustable reactive power compensation power capacitor, and is convenient for the installation and maintenance of the steplessly adjustable reactive power compensation power capacitor.

[0012] Furthermore, a sliding seal is installed on the capacitor housing, and a conductive rod between the first capacitor plate and the first capacitor terminal is slidably installed in the sliding seal.

[0013] The beneficial effects of adopting the above further technical solution are: the provision of the sliding seal facilitates the installation and maintenance of the conductive rod, prevents the conductive rod from directly rubbing against the capacitor housing, and improves the sealing performance of the capacitor housing.

[0014] Furthermore, the first capacitor plate and the second capacitor plate are both made of a wound metal film material, and the cross section of the first capacitor plate and the second capacitor plate when facing each other is a double-wire winding structure.

[0015] The beneficial effect of adopting the above further technical solution is that the volume of the capacitor can be greatly reduced by using the wound metal film material for the two plates. By using two wound metal films as the plates, in actual operation, the capacitance is changed by plugging the movable plate. Since the conductor plate is curved, the space utilization rate is high, so that the present invention can achieve continuous changes when the capacitance is large while maintaining a small volume. When the two plates are completely facing each other, the cross-section presents a double-line winding structure, so that they are densely arranged in space to increase the available area of ​​the plates and reduce the distance between the plates. In actual operation, the first capacitor plate is controlled by a power mechanism to move in a plane parallel to the second capacitor plate to achieve changes in the actual capacitance area and capacitance.

[0016] Furthermore, the capacitor housing is grounded, and the power mechanism includes: a control circuit and a motor, and the control circuit is connected to the motor.

[0017] The beneficial effects of adopting the above further technical solution are: the capacitor housing is grounded, which improves the stability and reliability of the steplessly adjustable reactive power compensation power capacitor. The control circuit facilitates automatic control of the opening and closing of the power mechanism, improving automation. It is convenient to select the form of the power mechanism according to actual needs.

[0018] In addition, the present invention also provides a working method of a steplessly adjustable reactive compensation power capacitor, based on a steplessly adjustable reactive compensation power capacitor as described in any one of the above items, the working method of the steplessly adjustable reactive compensation power capacitor includes: S1, starting a power mechanism; S2, adjusting the first capacitor plate through the power mechanism to achieve a change in the area of ​​the plug-in part of the first capacitor plate and the second capacitor plate, thereby achieving adjustment of the capacitance.

[0019] The beneficial effects of the technical solution of the present invention are: in actual operation, the first capacitor plate is controlled to move in a plane parallel to the second capacitor plate by a power mechanism to achieve the change of the actual capacitance area and capacitance. Two wound metal films are used as plates, and in actual operation, the capacitance is changed by plugging the movable plates. While achieving stepless adjustment of the capacitance of the reactive compensation power capacitor, the volume can be kept small, avoiding the high-frequency inrush current and pre-breakdown arcing caused by the conventional switch closing capacitor operation.

[0020] Furthermore, before step S1, it includes: S11, incorporating the power load into the reactive compensation power capacitor; S12, obtaining the feedback power factor after reactive compensation by sampling the control circuit; S13, calculating the difference between the current power factor and the target power factor to obtain the power factor index; in step S2, the power mechanism drives the first capacitor plate to insert and separate relative to the second capacitor plate according to the power factor index, so that the area of ​​the first capacitor plate and the second capacitor plate facing each other increases and decreases, so as to achieve a change in the capacitance value.

[0021] The beneficial effect of adopting the above-mentioned further technical scheme is that the power mechanism performs single-stage or cascade PID control on the torque and speed of the motor according to the power factor of the power load after receiving reactive power compensation by the control circuit, drives the conductive rod to drive the first capacitor plate to move toward the second capacitor plate in a plug-in manner, so that the area of ​​the two plates facing each other increases or decreases to achieve automatic matching and adjustment of the capacitance value.

[0022] Furthermore, the power factor index includes: a control method for the motor movement speed and position; after step S2, it includes: S3, after the adjustment is completed, repeating the closed-loop control to achieve automatic correction of the real-time reactive compensation amount.

[0023] The beneficial effect of adopting the above further technical solution is: after the adjustment is completed, the closed-loop control is repeated to realize the automatic correction of the real-time reactive power compensation amount, improve the accuracy of the adjustment, and improve automation.

[0024] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a steplessly adjustable reactive power compensation power capacitor provided in an embodiment of the present invention.

[0026] Figure 2 A schematic diagram of the spatial position of the cross section of the first capacitor plate and the second capacitor plate provided in an embodiment of the present invention.

[0027] Figure 3One of the schematic flow charts of the working method of the steplessly adjustable reactive power compensation power capacitor provided in the embodiment of the present invention.

[0028] Figure 4 The second schematic flowchart of the working method of the steplessly adjustable reactive power compensation power capacitor provided in the embodiment of the present invention.

[0029] Explanation of the accompanying drawings: 1. first capacitor plate; 2. second capacitor plate; 3. first capacitor terminal; 4. second capacitor terminal; 5. motor; 6. capacitor housing; 7. conductive rod; 8. sliding seal. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a steplessly adjustable reactive compensation power capacitor, comprising: a first capacitor plate 1, a second capacitor plate 2, a power mechanism for driving the first capacitor plate 1 to insert and separate relative to the second capacitor plate 2, and a capacitor housing 6, wherein the first capacitor plate 1 is slidably installed in the capacitor housing 6, the second capacitor plate 2 is installed in the capacitor housing 6, and the power mechanism is connected to the first capacitor plate 1.

[0032] The beneficial effects of the technical solution of the present invention are: in actual operation, the first capacitor plate is controlled to move in a plane parallel to the second capacitor plate by a power mechanism to achieve the change of the actual capacitance area and capacitance. Two wound metal films are used as plates, and in actual operation, the capacitance is changed by plugging the movable plates. While achieving stepless adjustment of the capacitance of the reactive compensation power capacitor, the volume can be kept small, avoiding the high-frequency inrush current and pre-breakdown arcing caused by the conventional switch closing capacitor operation.

[0033] The first capacitor plate can slide up and down.

[0034] The present invention can maintain a small volume while achieving stepless adjustment of the capacitance of the reactive compensation power capacitor, avoiding high-frequency inrush current and pre-breakdown arcing caused by conventional switch closing capacitor operations, and can also be applied to other large-capacity capacitor scenarios, with a wide range of applications.

[0035] The two capacitor plates are connected to the two wiring terminals respectively. When the two plates are completely opposite to each other, the cross section presents a double-line winding structure, so that they are densely arranged in space to increase the available area of ​​the plates and reduce the distance between the plates. In actual operation, the first capacitor plate 1 is controlled by a motor (electric motor) to move in a plane parallel to the second capacitor plate 2 to achieve changes in the actual capacitance area and capacitance.

[0036] like Figure 1 and Figure 2 As shown, further, there is a gap between the first capacitor plate 1 and the second capacitor plate 2 , an insulating material is provided in the gap, and the first capacitor plate 1 is located above the second capacitor plate 2 .

[0037] The beneficial effect of adopting the above further technical solution is: it is easy to form a stepless and adjustable reactive power compensation power capacitor, ensuring that the plate gap is not broken down at a high voltage level.

[0038] The actual plate size (the first capacitor plate and the second capacitor plate) is related to the capacitor compensation capacity and the dielectric insulating material used. Increasing the plate size can increase the maximum capacity that the capacitor can compensate. The volume of the low-voltage compensation capacitor is controlled within tens of centimeters in all directions. Changing the insertion depth can achieve stepless adjustment of the capacitor compensation power.

[0039] Furthermore, the insulating material is transformer oil or silicone grease.

[0040] The beneficial effect of adopting the above further technical solution is: using transformer oil, silicone grease, etc. as insulating medium to ensure that the gap between the plates is not broken down under high voltage levels.

[0041] like Figure 1 and Figure 2 As shown, further, the first capacitor plate 1 is connected to the first capacitor terminal 3 through the conductive rod 7, the second capacitor plate 2 is connected to the second capacitor terminal 4 through the conductive rod 7, the first capacitor terminal 3 and the second capacitor terminal 4 are both located on the outside of the capacitor housing 6, the conductive rod 7 between the first capacitor plate 1 and the first capacitor terminal 3 is slidably installed in the capacitor housing 6, and the power mechanism is connected to the conductive rod 7 between the first capacitor plate 1 and the first capacitor terminal 3 through an insulating member.

[0042] The beneficial effect of adopting the above further technical solution is that the power mechanism realizes the position adjustment of the first capacitor plate relative to the second capacitor plate through the conductive rod between the first capacitor terminal and the first capacitor plate. The first capacitor plate is controlled to move in a vertical plane through the action of the power mechanism on the conductive rod to realize the partial overlap or separation of the two plates, thereby changing the size and capacitance of the area of ​​the part facing the plates. The first capacitor plate and the second capacitor plate use the first capacitor terminal and the second capacitor terminal as poles for wiring, respectively, which is convenient for the wiring of the steplessly adjustable reactive power compensation power capacitor, and is convenient for the installation and maintenance of the steplessly adjustable reactive power compensation power capacitor.

[0043] The conductive rod 7 is fixedly and electrically connected to the first capacitor plate 1 perpendicular to the plugging direction.

[0044] like Figure 1 and Figure 2 As shown, further, a sliding seal 8 is installed on the capacitor housing 6 , and the conductive rod 7 between the first capacitor plate 1 and the first capacitor terminal 3 is slidably installed in the sliding seal 8 .

[0045] The beneficial effects of adopting the above further technical solution are: the provision of the sliding seal facilitates the installation and maintenance of the conductive rod, prevents the conductive rod from directly rubbing against the capacitor housing, and improves the sealing performance of the capacitor housing.

[0046] like Figure 1 and Figure 2 As shown, further, the first capacitor plate 1 and the second capacitor plate 2 are both made of a wound metal film material, and the cross section of the first capacitor plate 1 and the second capacitor plate 2 when facing each other is a double-wire winding structure.

[0047] The beneficial effect of adopting the above further technical solution is that the volume of the capacitor can be greatly reduced by using the wound metal film material for the two plates. By using two wound metal films as the plates, in actual operation, the capacitance is changed by plugging the movable plate. Since the conductor plate is curved, the space utilization rate is high, so that the present invention can achieve continuous changes when the capacitance is large while maintaining a small volume. When the two plates are completely facing each other, the cross-section presents a double-line winding structure, so that they are densely arranged in space to increase the available area of ​​the plates and reduce the distance between the plates. In actual operation, the first capacitor plate is controlled by a power mechanism to move in a plane parallel to the second capacitor plate to achieve changes in the actual capacitance area and capacitance.

[0048] like Figure 1 and Figure 2 As shown, further, the capacitor housing 6 is grounded, and the power mechanism includes: a control circuit and a motor, and the control circuit is connected to the motor.

[0049] The beneficial effects of adopting the above further technical solution are: the capacitor shell is grounded, which improves the stability and reliability of the steplessly adjustable reactive power compensation capacitor. The power mechanism is connected with a control circuit, which is convenient for automatically controlling the opening and closing of the power mechanism and improving automation.

[0050] In actual operation, the motor (electric motor) speed is PID controlled according to the compensated power factor so that the movable plate (first capacitor plate) moves in a plane parallel to the stationary plate (second capacitor plate) to achieve changes in the actual plate area and capacitance.

[0051] As an alternative to the electric motor, the electric motor can be replaced by an electric push rod, a hydraulic push rod or a pneumatic push rod, so that the form of the power mechanism can be selected according to actual needs.

[0052] The motor can be a linear motor or a rotary motor through a conversion device. The motor 5 can be a tubular linear motor, and the mover and the insulating member connected to the conductive rod 7 are rigidly connected when in use.

[0053] Figure 1 The figure shows a schematic diagram of the structure of a steplessly adjustable reactive power compensation capacitor, which includes: a first capacitor terminal 3, a second capacitor terminal 4, a capacitor housing 6, a first capacitor plate 1, a second capacitor plate 2, a motor 5, a conductive rod 7 and a sliding seal 8; the first capacitor plate 1 and the second capacitor plate 2 are respectively fixedly electrically connected to the first capacitor terminal 3 and the second capacitor terminal 4 through the conductive rod 7, and the motor 5 is fixedly electrically connected to the conductive rod 7; the motor 5 adjusts the position of the first capacitor plate 1 relative to the second capacitor plate 2 through the conductive rod 7 between the first capacitor terminal 3 and the first capacitor plate 1, and the motor 5 is connected to the conductive rod 7 through an insulating member, and the air clearance of the insulating member meets the insulation requirements of the capacitor voltage level.

[0054] Furthermore, the first capacitor plate 1 and the second capacitor plate 2 may be made of a wound metal film material.

[0055] Furthermore, liquid insulating materials such as transformer oil, silicone grease, etc. may be used between the first capacitor plate 1 and the second capacitor plate 2 .

[0056] Furthermore, the first capacitor terminal 3 and the second capacitor terminal 4 are insulated and fixedly mechanically connected to the capacitor housing 6 .

[0057] Furthermore, the capacitor housing 6 is grounded during operation.

[0058] Furthermore, a sliding seal 8 is installed on the capacitor housing 6, and the conductive rod between the first capacitor plate and the first capacitor terminal is slidably installed in the sliding seal 8. A sliding seal is adopted between the conductive rod 7 and the capacitor housing 6 to meet the insulation requirements therebetween.

[0059] Combination Figure 2 As shown, a schematic diagram of the spatial position of the cross section of the first capacitor plate 1 and the second capacitor plate 2 is shown. When the first capacitor plate 1 and the second capacitor plate 2 are completely opposite to each other, the cross section is a double-line wrapped structure, so that they are densely arranged in space to increase the available area of ​​the plates and reduce the distance between the plates. During actual operation, the first capacitor plate 1 and the second capacitor plate 2 serve as the positive and negative plates of the capacitor respectively. The first capacitor plate 1 is controlled to move in a vertical plane through the action of the motor 5 on the conductive rod 7 to achieve partial overlap or separation of the two plates, thereby changing the size and capacitance of the area of ​​the opposite parts of the plates; the capacitance reaches the maximum when the plates are completely opposite to each other, and the capacitance reaches the minimum when they are completely separated; the use of a wound metal film material for the two plates can greatly reduce the volume of the capacitor.

[0060] Two wound metal films are used as plates. In actual operation, the capacitance is changed by plugging in the movable plate (the first capacitor plate). Since the conductor plates (the first capacitor plate and the second capacitor plate) are curved, the space utilization rate is high, so that the present invention can maintain a small volume while achieving continuous change of capacitance when the capacitance is large. At the same time, transformer oil, silicone grease, etc. are used as insulating media to ensure that the plate gap is not broken down under high voltage levels. The present invention has a wider range of applications while meeting the requirements for stepless change of the capacitance of reactive compensation power capacitors, and can be used for circuit precision tuning, continuous voltage boost and voltage reduction, reactive compensation, etc.

[0061] like Figure 3 As shown, in addition, the present invention also provides a working method of a steplessly adjustable reactive compensation power capacitor, based on a steplessly adjustable reactive compensation power capacitor described in any one of the above items, the working method of the steplessly adjustable reactive compensation power capacitor includes: S1, starting a power mechanism; S2, adjusting the first capacitor plate through the power mechanism to achieve a change in the area of ​​the plug-in part of the first capacitor plate and the second capacitor plate, thereby achieving adjustment of the capacitance.

[0062] The beneficial effects of the technical solution of the present invention are: in actual operation, the first capacitor plate is controlled to move in a plane parallel to the second capacitor plate by a power mechanism to achieve the change of the actual capacitance area and capacitance. Two wound metal films are used as plates, and in actual operation, the capacitance is changed by plugging the movable plates. While achieving stepless adjustment of the capacitance of the reactive compensation power capacitor, the volume can be kept small, avoiding the high-frequency inrush current and pre-breakdown arcing caused by the conventional switch closing capacitor operation.

[0063] The working method of the steplessly adjustable reactive power compensation power capacitor is as follows: the first capacitor plate 1 and the second capacitor plate 2 use the first capacitor terminal 3 and the second capacitor terminal 4 as poles for wiring respectively, and the conductive rod 7 is electrically insulated from the motor 5. When the motor 5 receives manual control or an electrical signal from a control circuit, it drives the conductive plate (conductive rod 7) to drive the first capacitor plate 1 to move toward the second capacitor plate 2 in a plug-in manner, so that the area of ​​the two plates facing each other increases or decreases to achieve a change in the capacitance value.

[0064] Furthermore, before step S1, it includes: S11, incorporating the power load into the reactive compensation power capacitor; S12, obtaining the feedback power factor after reactive compensation by sampling the control circuit; S13, calculating the difference between the current power factor and the target power factor to obtain the power factor index; in step S2, the power mechanism drives the first capacitor plate to insert and separate relative to the second capacitor plate according to the power factor index, so that the area of ​​the first capacitor plate and the second capacitor plate facing each other increases and decreases, so as to achieve a change in the capacitance value.

[0065] The beneficial effect of adopting the above-mentioned further technical scheme is that the power mechanism performs single-stage or cascade PID control on the torque and speed of the motor according to the power factor of the power load after receiving reactive power compensation by the control circuit, drives the conductive rod to drive the first capacitor plate to move toward the second capacitor plate in a plug-in manner, so that the area of ​​the two plates facing each other increases or decreases to achieve automatic matching and adjustment of the capacitance value.

[0066] In actual operation, after detecting the power factor, the motor (electric motor) controls the first capacitor plate to move in a plane parallel to the second capacitor plate to achieve the change of the actual capacitance area and capacitance. The power mechanism performs single-stage or cascade PID control on the torque and speed of the motor 5 by the control circuit according to the power factor of the power load after receiving reactive power compensation, and drives the conductive rod 7 to drive the first capacitor plate to move toward the second capacitor plate in a plug-in manner so that the area of ​​the two plates facing each other increases or decreases, so as to achieve automatic matching and adjustment of the capacitance value.

[0067] Furthermore, the power factor index includes: a control method for the motor movement speed and position; after step S2, it includes: S3, after the adjustment is completed, repeating the closed-loop control to achieve automatic correction of the real-time reactive compensation amount.

[0068] The beneficial effect of adopting the above further technical solution is: after the adjustment is completed, the closed-loop control is repeated to realize the automatic correction of the real-time reactive power compensation amount, improve the accuracy of the adjustment, and improve automation.

[0069] like Figure 4As shown, S1, the power load is incorporated into the reactive power compensation capacitor; S2, sampling and obtaining the feedback power factor after reactive power compensation; S3, calculating the difference between the current power factor and the target power factor; S4, the power mechanism controls the motor to adjust the position of the conductive plate (conductive rod) and the plate 1 (the first capacitor plate) according to the power factor index. Return to step S2.

[0070] The working process of the steplessly adjustable reactive power compensation capacitor includes:

[0071] The power load is incorporated into the reactive compensation power capacitor, and the motor control circuit (control circuit) samples and obtains the feedback power factor after reactive compensation. The control method of the motor movement speed and position is obtained by calculating the difference between the current power factor and the target power factor, and the position of the conductive rod and the capacitor plate 1 (the first capacitor plate) is adjusted to achieve the change of the area of ​​the plug-in part of the capacitor plate and the adjustment of the capacitance. After the adjustment is completed, the closed-loop control is repeated to realize the automatic correction of the real-time reactive compensation amount.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steplessly adjustable reactive power compensation capacitor, characterized in that: include: A first capacitor plate, a second capacitor plate, a power mechanism for driving the first capacitor plate to insert and separate relative to the second capacitor plate, and a capacitor housing, the first capacitor plate is slidably installed in the capacitor housing, the second capacitor plate is installed in the capacitor housing, and the power mechanism is connected to the first capacitor plate.

2. A steplessly adjustable reactive power compensation power capacitor according to claim 1, characterized in that: There is a gap between the first capacitor plate and the second capacitor plate, an insulating material is provided in the gap, and the first capacitor plate is located above the second capacitor plate.

3. A steplessly adjustable reactive power compensation power capacitor according to claim 2, characterized in that: The insulating material is transformer oil or silicone grease.

4. A steplessly adjustable reactive power compensation power capacitor according to claim 1, characterized in that: The first capacitor plate is connected to a first capacitor terminal via a conductive rod, the second capacitor plate is connected to a second capacitor terminal via a conductive rod, the first capacitor terminal and the second capacitor terminal are both located outside the capacitor housing, the conductive rod between the first capacitor plate and the first capacitor terminal is slidably installed in the capacitor housing, and the power mechanism is connected to the conductive rod between the first capacitor plate and the first capacitor terminal via an insulating member.

5. A steplessly adjustable reactive power compensation capacitor according to claim 4, characterized in that: A sliding seal is installed on the capacitor housing, and a conductive rod between the first capacitor plate and the first capacitor terminal is slidably installed in the sliding seal.

6. A steplessly adjustable reactive power compensation power capacitor according to claim 1, characterized in that: The first capacitor plate and the second capacitor plate are both made of a wound metal film material, and the cross section of the first capacitor plate and the second capacitor plate when facing each other is a double-wire winding structure.

7. The steplessly adjustable reactive power compensation capacitor according to claim 1 is characterized in that: The capacitor housing is grounded, and the power mechanism includes: a control circuit and a motor, wherein the control circuit is connected to the motor.

8. A method for operating a steplessly adjustable reactive power compensation capacitor, characterized in that: Based on a steplessly adjustable reactive power compensation power capacitor according to any one of claims 1 to 7, a working method of the steplessly adjustable reactive power compensation power capacitor comprises: S1, start the power mechanism; S2. The first capacitor plate is adjusted by a power mechanism to change the area of ​​the plug-in portion of the first capacitor plate and the second capacitor plate, thereby adjusting the capacitance.

9. The working method of a steplessly adjustable reactive power compensation power capacitor according to claim 8, characterized in that: Step S1 includes: S11, incorporating the power load into the reactive power compensation power capacitor; S12, obtaining the feedback power factor after reactive power compensation through control circuit sampling; S13, calculating the difference between the current power factor and the target power factor to obtain a power factor index; In step S2, the power mechanism drives the first capacitor plate to insert and separate relative to the second capacitor plate according to the power factor index, so that the area of ​​the first capacitor plate and the second capacitor plate facing each other increases and decreases to achieve a change in capacitance.

10. The working method of a steplessly adjustable reactive power compensation power capacitor according to claim 9, characterized in that: The power factor index includes: the control method of the motor movement speed and position; after step S2, it includes: S3, after the adjustment is completed, repeat the closed-loop control to realize the automatic correction of the real-time reactive power compensation amount.

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