CN113410848A - Touch reactive power compensation device - Google Patents
Touch reactive power compensation device Download PDFInfo
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- CN113410848A CN113410848A CN202110567734.8A CN202110567734A CN113410848A CN 113410848 A CN113410848 A CN 113410848A CN 202110567734 A CN202110567734 A CN 202110567734A CN 113410848 A CN113410848 A CN 113410848A
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- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 230000003993 interaction Effects 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- JXASPPWQHFOWPL-UHFFFAOYSA-N Tamarixin Natural products C1=C(O)C(OC)=CC=C1C1=C(OC2C(C(O)C(O)C(CO)O2)O)C(=O)C2=C(O)C=C(O)C=C2O1 JXASPPWQHFOWPL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a touch reactive power compensation device which comprises a plurality of groups of compensation capacitor circuit units, a control unit and a man-machine interaction unit, wherein the control unit and the man-machine interaction unit are used for controlling and switching each group of compensation capacitor circuit units, the number of load motors is set through the man-machine interaction unit, different compensation capacitor circuit units are selected by the control unit to be connected to a load power supply system to adapt to the number change of the load motors, the reactive power compensation adjustment of the load power supply system is completed, and a compensated power factor is maintained between 0.6 and 0.8, so that the output efficiency and the stability of the load power supply system are improved.
Description
Technical Field
The invention belongs to the technical field of power supply of power systems, and particularly relates to a touch reactive power compensation device.
Background
The power supply system drives a motor load to operate, the motor belongs to an inductive load, under the condition of not performing reactive power compensation, the load power factor (lambda) is very small, the output efficiency of the power supply system is low, in order to increase the power factor and improve the operating efficiency of the system, a capacitor with a certain capacity needs to be configured according to the size of the load power, and the reactive power is provided for the load through the capacitor, so that the output of the power supply system is more efficient and stable. The efficiency of the power generation equipment is generally characterized by a power factor lambda (the higher the efficiency is when lambda is close to 1), and the method of utilizing the compensation capacitor can effectively improve the load power factor, reduce the loss on a line and improve the power supply quality.
When the number of the motors is changed, the capacitance must be changed, otherwise, under-compensation or over-compensation occurs, wherein the over-compensation phenomenon directly causes the voltage in the circuit to be increased instantly, so that loop components run in an overload manner, and in a severe case, the components are broken down, the circuit is damaged, and the stable operation of a power supply system is influenced.
In order to facilitate simple and quick operation of an operator and realize automatic switching of corresponding capacity compensation capacitors according to load power values, a touch reactive power compensation device is developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a touch reactive power compensation device.
The invention is realized by the following technical scheme:
the utility model provides a touch-control formula reactive power compensation device, includes multiunit compensation capacitor circuit unit, is used for controlling to switch each control unit and the human-computer interaction unit of group's compensation capacitor circuit unit, sets for the quantity of load motor through the human-computer interaction unit, selects different compensation capacitor circuit units to insert the quantity change that adapts to the load motor through the control unit, accomplishes and carries out reactive power compensation adjustment to load power supply system.
In the technical scheme, the compensated power factor is maintained between 0.6 and 0.8, so that the output efficiency and the stability of the load power supply system are improved.
In the above technical scheme, each group of compensation capacitor circuit units includes a capacitor switching contactor and a compensation capacitor, and when the capacitor switching contactor is turned on, the compensation capacitors of the group of compensation capacitor circuit units are connected to the load power supply system.
In the technical scheme, the control unit adopts a PLC (programmable logic controller) as a control core, the PLC is connected with the human-computer interaction unit, the state signals of the capacitance switching contactors in each group of compensation capacitance circuit units are collected through an input signal module (DI) of the PLC, the PLC performs program judgment according to the number of motors input by the touch screen, a driving signal is sent through an output signal module (DQ) of the PLC, and driving and disconnection of each capacitance switching contactor are completed through a relay, so that a proper compensation capacitance is put into a loop.
In the technical scheme, the man-machine interaction unit adopts a touch screen, and the model is Kunlun Tongtai Tpc7062 Ti.
In the technical scheme, the operation records are uploaded to the human-computer interaction unit for recording every time the capacitor switching contactor finishes acting.
In the technical scheme, the PLC is S7-1200PLC, the PLC serves as a slave station end PLC, the slave station end PLC is connected with a relay used for driving the capacitance switching contactor and is connected with the man-machine interaction unit in a PROFINET communication mode, the slave station end PLC is connected with a master station end PLC in the control cabinet, and the master station end PLC is S7-1500 PLC.
In the above technical scheme, according to the formula
Calculating the compensation capacitance capacity of the single load motor, wherein,
cosφ1is a load natural power factor, cos phi is a compensated power factor, and P is the active power of a single load motor; u is the supply voltage, ω 2 pi f, f is the nominal frequency of the motor.
The invention has the advantages and beneficial effects that:
the invention can be applied to a power supply system aiming at motor loads in a certain quantity range, provides a convenient and touch operation mode for field operation, realizes the automatic matching and switching functions of reactive compensation capacity, and maintains the power factor (lambda) between 0.6 and 0.8, thereby improving the output efficiency and stability of the power supply system.
Drawings
FIG. 1 is a schematic diagram of a power supply system;
FIG. 2 is a schematic diagram of a reactive power compensation apparatus;
FIG. 3 is a schematic diagram of a reactive power compensation device communication;
FIG. 4.1 is a schematic circuit diagram of a compensating capacitor connected to a load power supply system;
FIG. 4.2 is a circuit vector diagram of a compensating capacitor access load power supply system;
FIG. 5 is a flowchart of a PLC control process;
fig. 6 is a main interface of the touch reactive power compensation device;
FIG. 7 is a 1# operating converter capacitance compensation interface;
FIG. 8 is a diagram of a No. 1 operating converter disable capacitance compensation interface;
FIG. 9 nominal frequency input motor number interface;
FIG. 10 alarm recording interface;
FIG. 11 operates a record interface.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
As shown in fig. 1-3, the touch reactive power compensation device includes 6 compensation capacitor circuit units, a control unit for controlling and switching the 6 compensation capacitor circuit units, and a human-computer interaction unit, wherein the number of load motors is set by the human-computer interaction unit, different compensation capacitor circuit units are selected by the control unit to be connected to the load power supply system to adapt to the number change of the load motors, so as to complete reactive power compensation adjustment of the load power supply system, and maintain a power factor (λ) between 0.6 and 0.8, thereby improving the output efficiency and stability of the load power supply system.
Each group of compensation capacitor circuit units comprises a capacitor switching contactor and a compensation capacitor, and when the capacitor switching contactor is switched on, the compensation capacitors of the group of compensation capacitor circuit units are connected into a load power supply system.
The control unit adopts a PLC (programmable logic controller) as a control core, the PLC is connected with the human-computer interaction unit, and the human-computer interaction unit adopts a touch screen (the model is Kunlun Tongtai Tpc7062 Ti); inputting the number of the starting motors through a touch screen, and communicating with a PLC; the state signals of the capacitance switching contactors in each group of compensation capacitor circuit units are collected through an input signal module (DI) of the PLC, the PLC performs program judgment according to the number of motors input by the touch screen, a driving signal is sent through an output signal module (DQ) of the PLC, and driving and disconnection of each capacitance switching contactor are completed through the relay, so that proper compensation capacitors are put into a loop. And after the capacitance switching contactor finishes the action, the operation record is uploaded to the touch screen for recording.
Further, referring to fig. 3, the PLC employs S7-1200PLC as a slave station-side PLC, which is connected with a relay for driving a capacitance switching contactor and is connected with the touch screen by means of PROFINET communication. The slave station end PLC is connected with a master station end PLC in the control cabinet, and the master station end PLC adopts S7-1500 PLC.
4.1-4.2 are schematic diagrams and vector diagrams of the circuit of the power supply system with the compensation capacitor connected to the load, wherein the output voltage of the system is used as the reference phasor, and the current output by the frequency converter before the compensation capacitor is connected in parallel
Equal to load current
After the incorporation of the compensation capacitor, the load current
Reduced simultaneous generation of capacitive current
At this time
And
the sum of the two is equal to the output current of the frequency converter
And a power supply voltage
A phase difference therebetween of
From FIG. 4, it can be seen
φ1Is that
And a power supply voltage
The phase difference between them, from which the power factor is known
Is improved to
According to the circuit phasor diagram, the following results are obtained:
and is
IC＝UωC
Thus compensating the capacitance capacity:
the active power P of a single motor is 30W;
load natural power factor (before compensation)
Predicted attainment of compensated power factor
Namely, it is
Or
The voltage U is 380V;
under a rated operation state, omega is 2 pi f 2 pi multiplied by 2000 4000 pi;
thus, it is possible to provide
According to the formula
And calculating the capacity of the compensation capacitor, wherein the theoretical capacity of the load compensation capacitor of a single motor is calculated to be more than or equal to 0.014 muF and less than or equal to 0.025 muF under the condition of 2000Hz rated frequency.
According to the calculation derivation and the motor load test, 50 motors with the compensation capacitance capacity of 1 muF/phase (star connection mode) meet the requirement when the rated frequency operates
Namely, the compensation capacitor capacity of a single motor is 0.02 mu F/phase.
As shown in table 1, for motor devices in different number ranges, the PLC performs automatic capacitance compensation, and as required, the PLC needs to satisfy five conditions, namely 100, 200, 300, 400, and 500, and the number of motors is all a multiple of 50, so that 50 motors are used as a base number and are sequentially increased. Under the frequency state of rated 2000Hz, compensation mode distribution is carried out according to the required capacitance capacity, a single motor needs 0.02 muF and is divided into 11 sections, overcompensation phenomenon can be caused if overcompensation is carried out, circuit voltage is directly increased, the rated voltage withstanding range of components is exceeded, damage of breakdown lines of the components is caused, test failure is indirectly caused, compensation capacitance calculation is carried out according to the minimum motor number of each range in order to avoid overcompensation phenomenon, a theoretical compensation capacitance capacity value is obtained, and partial capacitance value fine adjustment is carried out according to the existing capacitors to obtain the compensation capacitance capacity of each range.
TABLE 1
As shown in table 2, the capacitance and the number of the matching capacitors in the touch reactive power compensation device are correspondingly arranged and combined to complete the reactive power compensation for different numbers of motors.
TABLE 2
Fig. 5 is a flowchart of a control procedure of a PLC (slave PLC) of the touch reactive power compensation device, wherein the procedure is as follows:
(I) initialization
The main program entry, start initialization, S1.
(II) receiving the frequency state of the frequency converter sent by the PLC at the master station end
After initialization, the program first waits for receiving the frequency value of the frequency converter, so as to determine whether to allow the subsequent operation to put into the compensation capacitor, S2.
(III) frequency State judgment
The program determines whether the received frequency value is the rated frequency of 2000Hz, if so, executes the next operation, otherwise, returns to continue waiting, S3.
(IV) entering the Compensation procedure
At the nominal frequency of 2000Hz, the PLC enters a compensation program loop, S4.
(V) receiving the number of touch screen motors
And receiving the number of the starting motors manually input by the touch screen, S5.
(VI) quantitative Range determination
And after the PLC program receives the number of the motors sent by the touch screen, sequentially judging the 11 sections of ranges, and performing the next operation according to the range section program in which the number of the motors is consistent, S6.
(VII) confirmation Key operation of touch Screen
And after the judgment of the starting motor number range program is completed, waiting for a confirmation key instruction of manual operation of the touch screen, and receiving a capacitance input instruction sent by the PLC (programmable logic controller), S7.
(VIII) input compensation capacitance
And the PLC sends a driving signal, and drives the corresponding capacitor switching contactor through the corresponding relay to complete the compensation capacitor switching, S8.
(IX) touchscreen display capacitance Capacity
After the compensation capacitor is put into operation, the PLC feeds back the capacitance to the touch screen for display, S9.
(X) end
The routine ends, S10.
As shown in fig. 6, the main interface of the touch reactive power compensation device may select a frequency converter to be started in the current test, and enter a corresponding frequency converter compensation capacitor operation interface.
As shown in fig. 7, the interface of the 1# working frequency converter for capacitance compensation is shown, and if the PLC determines that the frequency is in the state of 2000Hz, the "nominal frequency compensation start" button is operable, and a click can enter the next interface.
Fig. 8 shows an interface for prohibiting capacitance compensation of the # 1 operating frequency converter, and if the PLC determines that the frequency does not reach 2000Hz, the "nominal frequency compensation start" button is in a gray state and is inoperable.
Fig. 9 is a rated frequency input motor number interface, in which the number of motors can be manually input, the compensation capacitor can be put in by clicking the "confirm" key, and after the compensation capacitor is put in, the "confirm" key is in a gray state and is inoperable, so as to prevent manual misoperation, and when the test is finished, the "stop" key is clicked, and the compensation capacitor is cut out. After the compensation capacitors are put in, the interface can display the number of the motors and the capacity of the added compensation capacitors.
Fig. 10 is an alarm log interface, and when a system fails, a fault log can be queried on the interface.
As shown in fig. 11, the operation record interface is an interface where the operation record of the touch reactive power compensation device can be queried.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (9)
1. A touch reactive power compensation device is characterized in that: the system comprises a plurality of groups of compensation capacitor circuit units, a control unit and a man-machine interaction unit, wherein the control unit is used for controlling and switching each group of compensation capacitor circuit units, the number of load motors is set through the man-machine interaction unit, different compensation capacitor circuit units are selected to be connected into a load power supply system through the control unit to adapt to the number change of the load motors, and reactive power compensation adjustment of the load power supply system is completed.
2. The touch reactive power compensation device of claim 1, wherein: the compensated power factor is maintained between 0.6 and 0.8.
3. The touch reactive power compensation device of claim 1, wherein: each group of compensation capacitor circuit units comprises a capacitor switching contactor and a compensation capacitor, and when the capacitor switching contactor is switched on, the compensation capacitors of the group of compensation capacitor circuit units are connected into a load power supply system.
4. The touch reactive power compensation device of claim 3, wherein: the control unit adopts a PLC (programmable logic controller) as a control core, the PLC is connected with the human-computer interaction unit, the state signals of the capacitance switching contactors in each group of compensation capacitance circuit units are collected through an input signal module (DI) of the PLC, the PLC performs program judgment according to the number of motors input by the touch screen, a driving signal is sent through an output signal module (DQ) of the PLC, and the driving and the disconnection of each capacitance switching contactor are completed through a relay, so that a proper compensation capacitor is put into a loop.
5. The touch reactive power compensation device of claim 4, wherein: the human-computer interaction unit adopts a touch screen.
6. The touch reactive power compensation device of claim 5, wherein: the touch screen is of the type Kunlun Tu Tpc7062 Ti.
7. The touch reactive power compensation device of claim 5, wherein: and after the capacitor switching contactor finishes the action, the operation record is uploaded to the man-machine interaction unit for recording.
8. The touch reactive power compensation device of claim 4, wherein: the PLC adopts S7-1200PLC as a slave station end PLC, the slave station end PLC is connected with a relay for driving a capacitance switching contactor and is connected with the man-machine interaction unit in a PROFINET communication mode, the slave station end PLC is connected with a master station end PLC in the control cabinet, and the master station end PLC adopts S7-1500 PLC.
9. The touch reactive power compensation device of claim 1, wherein: according to the formula
Calculating the compensation capacitance capacity of the single load motor, wherein,
cosφ1is a load natural power factor, cos phi is a compensated power factor, and P is the active power of a single load motor; u is the supply voltage, ω 2 pi f, f is the nominal frequency of the motor.
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|---|---|---|---|
| CN202110567734.8A CN113410848A (en) | 2021-05-24 | 2021-05-24 | Touch reactive power compensation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110567734.8A CN113410848A (en) | 2021-05-24 | 2021-05-24 | Touch reactive power compensation device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2235171Y (en) * | 1995-08-09 | 1996-09-11 | 云南省建筑材料科学研究设计院 | Safety energy-saving comprehensive control cabinet for low-voltage AC electric machine |
| CN103501014A (en) * | 2013-10-21 | 2014-01-08 | 安徽天沃电气技术有限公司 | Intelligent reactive compensation controller device with master and slave functions |
| CN103825287A (en) * | 2014-03-14 | 2014-05-28 | 武汉理工大学 | Quick dynamic reactive-power compensating method of combined electrical load |
| CN108418227A (en) * | 2018-05-18 | 2018-08-17 | 核工业理化工程研究院 | A kind of autocompensation installation and its compensation method based on PLC controls |
| CN110868056A (en) * | 2019-12-25 | 2020-03-06 | 核工业理化工程研究院 | Dynamic switching device for remote control frequency converter |
-
2021
- 2021-05-24 CN CN202110567734.8A patent/CN113410848A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2235171Y (en) * | 1995-08-09 | 1996-09-11 | 云南省建筑材料科学研究设计院 | Safety energy-saving comprehensive control cabinet for low-voltage AC electric machine |
| CN103501014A (en) * | 2013-10-21 | 2014-01-08 | 安徽天沃电气技术有限公司 | Intelligent reactive compensation controller device with master and slave functions |
| CN103825287A (en) * | 2014-03-14 | 2014-05-28 | 武汉理工大学 | Quick dynamic reactive-power compensating method of combined electrical load |
| CN108418227A (en) * | 2018-05-18 | 2018-08-17 | 核工业理化工程研究院 | A kind of autocompensation installation and its compensation method based on PLC controls |
| CN110868056A (en) * | 2019-12-25 | 2020-03-06 | 核工业理化工程研究院 | Dynamic switching device for remote control frequency converter |
Non-Patent Citations (1)
| Title |
|---|
| 张国伟 等: "6kV配电线路无功补偿技术的探讨", 《胜利油田职工大学学报》 * |
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Application publication date: 20210917 |