Voltage regulating and grouping reactive compensation controller

Abstract

The utility model discloses a voltage regulating and grouping reactive compensation controller, which comprises a central processing unit, a sampling holder, a relay and an input board, and is characterized in that one end of the sampling holder is connected with system voltage and current, one end of the sampling holder is connected with a multi-way switch, the multi-way switch is connected with an A / D converter, the A / D converter is connected with the central processing unit, and the central processing unit is connected with the relay. The central processing unit is connected with a keyboard, a display and a data memory, the central processing unit is connected with an input board of a signal input port through a photoelectric isolation circuit, and is used for receiving switch signals of a capacitor bank and an on-load self-coupling voltage regulating transformer, and an RS485 communication interface is connected with an external network. And data calculated by the central processing unit are respectively connected with the grouping and voltage regulating driving mechanism through the protection and isolation circuit. The beneficial effects of the utility model lie in that: the proper input voltage is intelligently selected, the inrush current of the input capacitor is effectively reduced, and the influence on the power grid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of controllers, in particular to a voltage regulation and grouping reactive power compensation controller. Background Art

[0002] A voltage regulation and grouping reactive power compensation controller is designed, which is an automatic controller integrating real-time monitoring and analysis, optimization control and calculation, real-time status analysis and equipment operation management of the reactive power compensation process of the distribution network. The data storage device of the voltage regulation and grouping reactive power compensation controller stores the mathematical model established by using the concept of fuzzy mathematics, and obtains the reactive power regulation criterion of the fuzzy boundary. The CPU takes the ideal power supply parameter voltage and power factor of the power supply network as the target, and takes the reactive power demand and target parameters of the power supply network measured actually as the control basis, and compares the control basis with the capacity of the capacitor controlled by the dedicated switch. If the switching conditions of the single or multiple groups of dedicated switch-controlled capacitors are met, the capacitor group is switched first, and the voltage regulation compensation action is locked. If there is still a gap with the target parameter after the switching of the capacitor group, the difference is compared with the size of the dynamic adjustment compensation capacitor capacity of each level of the voltage regulator to determine the adjustment level. However, because its compensation is large in steps, the places with high reactive power requirements no longer meet the requirements of the power system, and there are problems. Utility Model Content

[0003] In view of the defects in the prior art, the utility model provides a voltage regulation and grouping reactive power compensation controller to solve the existing problems.

[0004] The utility model is realized through the following technical scheme: a voltage regulation and grouping reactive power compensation controller, comprising a central processing unit, a sampling and holding device, a relay and an input quantity board, characterized in that: one end of the sampling and holding device is connected to the system voltage and current, one end of the sampling and holding device is connected to a multi-way switch, the multi-way switch is connected to an A / D converter, the A / D converter is connected to the central processing unit, a keyboard and a display are connected to the central processing unit, and a data storage device is connected to the input quantity board of the signal input port through a photoelectric isolation circuit, the central processing unit receives the switch signal of the capacitor group and the loaded auto-coupling voltage-regulating transformer, the RS485 communication interface is connected to the external network, and the data calculated by the central processing unit are respectively connected to the grouping and voltage regulation drive mechanism through the protection and isolation circuit.

[0005] Preferably, the controller can display harmonics, analyze, protect and alarm; at the same time, a harmonic protection setting of 0~99.9% is set to be optional. When the setting is exceeded, the capacitors that have been put into use will be cut off and an alarm will be sounded until the alarm disappears after returning to normal; if the setting is 0, it means that harmonic protection is disabled, and only the numerical tables and bar charts of the 3rd to 15th harmonic current, voltage, total current distortion rate, and total voltage distortion rate are displayed.

[0006] Preferably, the central processing unit is the core of the controller, which completes the acquisition of analog quantities, power calculation, VQC logic judgment, control output and serial port communication, etc.; it can automatically detect program errors and instantly reset the central processing unit, and the device has no recovery button.

[0007] Preferably, the input board mainly completes the collection of position signals such as the switch status of the capacitor group, the voltage regulating switch status, the low-voltage side switch of the main transformer, the busbar switch, etc., and sends them to the central processing unit after photoelectric isolation, filtering and defibrillation. A relay junction box is installed before the input board to convert 220v into 12v weak current control, and an electromagnetic isolation is performed to reduce electromagnetic interference during the operation process and improve the working reliability of the controller.

[0008] The beneficial effects of the utility model are embodied in: the compensation is carried out by combining capacitor groups and voltage-adjustable and capacitance-adjustable capacitor groups, which can not only meet the large-capacity compensation, but also realize dynamic small-capacity precision compensation, which is more accurate and intelligent than the ordinary capacitor group compensation method. The voltage-adjustable and capacitance-adjustable capacitor group is based on the principle that the compensation capacity is proportional to the square of the capacitor operating voltage. The total reactive power emitted by the capacitor can be adjusted by adjusting the working voltage at both ends of the capacitor and changing the utilization coefficient of the capacitor to achieve the purpose of dynamic reactive power compensation. Since the voltage at the capacitor end is adjusted by the voltage regulator, the reactor is eliminated, so that the capacitor can work stably below the rated voltage for a long time, extending the life of the capacitor. Since the switching method is not adopted, there is no charging and discharging problem caused by switching during the operation of the capacitor. The adjustment can be carried out at any time with the change of the reactive power of the system, and timely adjustment can be realized to ensure that the system is in the best working state at any time, effectively improve the power factor, and reduce line loss. Intelligently select the appropriate input voltage to effectively reduce the inrush current of the input capacitor and reduce the impact on the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a flow chart of voltage regulation (pressure reduction) of the utility model;

[0012] Figure 3 This is a flow chart of voltage regulation (boosting) of the utility model;

[0013] Figure 4 This is a flowchart of the utility model for grouping;

[0014] Figure 5 This is a grouping flow chart of the utility model.

[0015] In the attached figure, 1. sample holder, 2. multi-way switch, 3. A / D converter, 4. isolation circuit, 5. voltage regulating drive mechanism, 6. communication port, 7. central processing unit, 8. keyboard, 9. display, 10. photoelectric isolation, 11. input board. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0018] For ease of description, spatial relative terms such as "upper," "lower," "left," and "right" may be used herein to describe the relationship of one element or feature shown in a figure relative to another element or feature. It should be understood that the spatial terms are intended to include different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figure is inverted, elements described as being "below" other elements or features will be positioned "above" the other elements or features. Thus, the exemplary term "below" may include both upper and lower orientations.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation of the present invention is described in detail below in conjunction with specific embodiments: Figure 1-Figure 5The utility model shown is realized by the following technical scheme: a voltage regulation and grouping reactive power compensation controller, comprising a central processing unit 7, a sampling and holding device 1 and an input quantity board 11, characterized in that: one end of the sampling and holding device 2 is connected to the system voltage and current, one end of the sampling and holding device 1 is connected to the multi-way switch 2, the multi-way switch 2 is connected to the A / D converter 3, the A / D converter 3 is connected to the central processing unit 7, the central processing unit 7 is connected with a keyboard 8 and a display 9 and a data storage device, the central processing unit 7 is connected to the input quantity board 11 of the signal input port through the photoelectric isolation 10, receives the switch signal of the capacitor group and the loaded self-coupling voltage regulating transformer, the RS485 communication interface 6 is connected to the external network, and the data calculated by the central processing unit 7 is connected to the grouping and voltage regulating drive mechanism 5 respectively through the protection and isolation circuit 4.

[0021] The controller can display harmonics, analyze, protect and alarm. It also has a harmonic protection setting of 0~99.9% to be selected. When the setting is exceeded, the capacitors that have been put into use will be cut off and an alarm will be sounded until the alarm disappears after returning to normal. If the setting is 0, it means that harmonic protection is disabled, and only the numerical tables and bar charts of the 3rd to 15th harmonic current, voltage, total current distortion rate, and total voltage distortion rate are displayed.

[0022] The central processor 7 is the core of the controller, which completes the collection of analog quantities, power calculation, VQC logic judgment, control output and serial port communication, etc.; it can automatically detect program errors and instantly reset the central processor 7. The device has no recovery button.

[0023] The input quantity board 11 mainly completes the collection of position signals such as the switch status of the capacitor group, the voltage regulating switch status, the low-voltage side switch of the main transformer, and the busbar switch, and sends them to the central processor 7 through the photoelectric isolation 10 and the filtering and defibrillation. A relay junction box is installed before the input quantity board 11 to convert 220v into 12v weak current control, and an electromagnetic isolation is performed to reduce the electromagnetic interference during the operation process and improve the working reliability of the controller.

[0024] The working principle of the utility model is as follows: the current and voltage sampling and holding device 1 in the voltage regulation and grouping reactive power compensation controller is connected to the central processing unit 11 through a multi-way switch 2 and an A / D converter 3. The central processing unit 11 is connected to a keyboard 8 and a display 9, and a data storage device. The central processing unit 11 is connected to a signal input port through a photoelectric isolation 10 to receive a switch signal of a capacitor group and an on-load self-coupling voltage-regulating transformer. The RS485 communication interface 6 is connected to an external network. The data calculated by the central processing unit 11 is connected to the grouping and voltage regulation drive mechanism 5 respectively through a protection and isolation circuit 4.

[0025] According to the size of reactive power demand and the set single group capacity and the capacity of the first voltage regulation level, when the voltage regulation compensation action conditions are met, the voltage regulation compensation will be activated (group compensation will not meet the conditions). When the group compensation meets the conditions, the group compensation will be activated and the voltage regulation compensation action will be locked at the same time. Through logical judgment, the command is correctly issued to prevent the voltage regulation compensation from frequently acting and not acting within the ideal setting range.

[0026] Each group of capacity setting value is set separately, suitable for equal or unequal capacity, breaking through the conventional single setting value or proportional combination setting value, and can be set arbitrarily according to the actual situation of the user. The setting value can be selected in inductive (L) and capacitive (R), which enhances flexibility and is suitable for control that requires compensation in various occasions. When L is selected, if overcompensation occurs, a parallel reactance can be added to reduce the power factor.

[0027] Grouping and voltage regulation compensation run separately, which has been considered in the logic conditions. When the group setting is set to 0, the voltage regulation compensation runs separately; when the voltage regulation setting is set to 0, the group compensation runs separately.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model 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 by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A voltage regulation and grouping reactive power compensation controller, comprising a central processing unit (7), a sample holder (1) and an input quantity board (11), characterized in that: One end of the sample holder (1) is connected to the system voltage and current, and one end of the sample holder (1) is connected to the multi-way switch (2). The multi-way switch (2) is connected to the A / D converter (3). The A / D converter (3) is connected to the central processing unit (7). The central processing unit (7) is connected to a keyboard (8), a display (9) and a data storage device. The central processing unit (7) is connected to the input board (11) of the signal input port through the photoelectric isolation (10), receives the switch signal of the capacitor group and the on-load self-coupling voltage-regulating transformer, and the RS485 communication interface (6) is connected to the external network. The data calculated by the central processing unit (7) is connected to the grouping and voltage regulating drive mechanism (5) through the protection and isolation circuit (4); the controller can display harmonics, analyze, protect and alarm; at the same time, a harmonic protection setting value of 0 to 99.9% is set, and when the setting value is exceeded, the capacitor that has been put into use is cut off and an alarm is sounded until it returns to normal and the alarm disappears; if the setting value is 0, it means that the harmonic protection is disabled, and only the numerical table and the bar star diagram of the 3rd to 15th harmonic current, voltage, total current distortion rate, and total voltage distortion rate are displayed.

2. A voltage regulation and grouping reactive power compensation controller according to claim 1, characterized in that: The central processing unit (7) is the core of the controller, and completes analog quantity acquisition, power calculation, VQC logic judgment, control output and serial port communication; it can automatically detect program errors and instantly reset the central processing unit (7), and the central processing unit (7) has no recovery key.

3. A voltage regulation and grouping reactive power compensation controller according to claim 1, characterized in that: The input quantity board (11) is mainly used to collect the switch status of the capacitor bank, the voltage regulating switch status, the low-voltage side switch of the main transformer, and the busbar switch position signal, and sends the signals to the central processor (7) through photoelectric isolation (10) and filtering and defibrillation. A relay junction box is installed before the input quantity board (11) to convert 220V into 12V weak current control and perform electromagnetic isolation.

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