CN204741280U - Reactive compensation controller based on developments phase separating compensation - Google Patents
Reactive compensation controller based on developments phase separating compensation Download PDFInfo
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- CN204741280U CN204741280U CN201520419987.0U CN201520419987U CN204741280U CN 204741280 U CN204741280 U CN 204741280U CN 201520419987 U CN201520419987 U CN 201520419987U CN 204741280 U CN204741280 U CN 204741280U
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- 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
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Abstract
The utility model discloses a reactive compensation controller based on developments phase separating compensation, its structure includes current transformer CT, voltage transformer PT, real time control module, intelligent condenser, the advantage: in order to carry out the phase separating switching to multistage capacitor bank, drop into the condenser in the moment that capacitor voltage and system voltage equal, eliminated transient totally, make quick, accurate, safe, the easily control of compensation effect. In addition, owing to adopt the phase separating compensation, drop into corresponding condenser respectively according to the reactive power of each mutually required compensation, when having avoided three phase loads uneven, the full remuneration can be carried out to unbalanced reactive power to some looks overcompensation or some mutually under -compensated circumstances. This installation cost is low, the reliability is high, the volume of needing the maintenance work is little relatively. A promote application prospect that when is used for distribution network reactive compensation, can improve the power factor who loads, make the electric energy quality of infield improve greatly, have well .
Description
Technical field
The utility model is a kind of idle compensating control based on dynamic phase splitting compensation, belongs to electric power quality control technology field.
Background technology
In current rural power grids power distribution cabinet, generally use switching Shunt Capacitor Unit to carry out local reactive power compensation, to reach the idle conveying reduced in transmission of electricity, reduce line loss, improve quality of voltage, increase the object of meritorious conveying.
In existing low voltage parallel capacitor group connection, reactive power compensation is static compensation, and when Capacitor banks drops into, impulse current is large, and produce overvoltage during excision, self contact rapid wear, noise is melting welding greatly even, and the switching time is long.Controlling unit can not be accomplished phase-splitting, classification, fast and the requirement of tracing compensation substantially.
Summary of the invention
The utility model proposes a kind of idle compensating control based on dynamic phase splitting compensation, its object is to overcome the deficiencies in the prior art and Problems existing, this controller compensation effect fast, accurately, safety, cleaning and be easy to control, in addition, owing to adopting phase splitting compensation, full remuneration can be carried out to unbalanced reactive power.
Technical solution of the present utility model: based on the idle compensating control of dynamic phase splitting compensation, its structure comprises Current Transmit, voltage transformer pt, real-time control module, Intelligent capacitor; Wherein the first signal input/output end of Current Transmit, the first signal input/output end corresponding first signal input/output terminal of connection bus, the secondary signal input/output terminal of bus of voltage transformer pt, the secondary signal input/output end correspondence of Current Transmit, voltage transformer pt connects first, second signal input/output terminal of real-time control module, and the signal input/output end correspondence of Intelligent capacitor connects the 3rd signal input/output terminal of real-time control module.
Based on the control method of the idle compensating control of dynamic phase splitting compensation, comprise the following steps:
(1) access voltage, current signal that the voltage transformer summation current transformer on distribution network system bus exports, be linked into friendship and adopt and count;
(2) according to the definition of reactive power, calculate three phase reactive power by single-chip microcomputer and be respectively compensatory control amount as each phase Capacitor banks;
(3) single-chip microcomputer according to compensatory control amount calculate each need mutually drop into capacitor capacity and can drop into condenser capacity as drop into or excision basis for estimation;
(4) drop into when Intelligent capacitor group receives or after excision order, determine that capacitor drops into or the excision moment by zero cross detection circuit, perform capacitor switching, drop into the Capacitor banks that capacity is applicable to, make the power factor of each phase more than 0.95;
(5) step (1) ~ (4) are repeated, can the change of follow load, realize reactive-load dynamic compensation.
The beneficial effects of the utility model are: to carry out phase-splitting switching to hierarchical capacitor group, drop into capacitor, completely eliminate transient process in condenser voltage moment equal with system voltage, make compensation effect fast, accurately, safely, be easy to control.In addition, owing to adopting phase splitting compensation, drop into corresponding capacitor respectively, when avoiding three-phase load unbalance according to each required reactive power compensated mutually, some phase overcompensation or some mutually under-compensated situation, can carry out full remuneration to unbalanced reactive power.And dynamic reactive power phase splitting compensation installation cost of the present invention is low, reliability is high, relatively need maintenance workload little.During for distribution network var compensation, the power factor of load can be improved, the quality of power supply of infield be improved greatly, there is good popularizing application prospect.
Accompanying drawing explanation
Fig. 1 is the idle compensating control of the dynamic phase splitting compensation of the utility model and the annexation schematic diagram of network system bus;
Fig. 2 is the control flow chart of the idle compensating control of the dynamic phase splitting compensation of the utility model.
Embodiment
Based on the idle compensating control of dynamic phase splitting compensation, its structure comprises Current Transmit, voltage transformer pt, real-time control module, Intelligent capacitor; Wherein the first signal input/output end of Current Transmit, the first signal input/output end corresponding first signal input/output terminal of connection bus, the secondary signal input/output terminal of bus of voltage transformer pt, the secondary signal input/output end correspondence of Current Transmit, voltage transformer pt connects first, second signal input/output terminal of real-time control module, and the signal input/output end correspondence of Intelligent capacitor connects the 3rd signal input/output terminal of real-time control module.
Described Intelligent capacitor group is made up of capacitor, zero cross detection circuit, owing to there being zero cross detection circuit, can not impact when capacitor drops into or excises to distribution network systems.In addition, every four groups mutually of capacitor, capacity distributes by 1: 2: 4: 8, phase-splitting, classification switching.
Described real-time control module comprises control relay, chip, power supply unit are adopted in single-chip microcomputer, friendship; The signal input/output end that wherein chip is adopted in control relay, single-chip microcomputer, friendship is connected in series successively.
Described single-chip microcomputer as host CPU, as the main control part of real-time control module, realizes the mutual of data processing and peripheral components by ATMEL ARM SAM4L.
Described special friendship is adopted chip and is used ATT7022E chip, realizes collection and exchanges the essential informations such as the voltage and current of inlet wire.
Described power subsystem realizes whole system function of supplying power.
The output signal being connected on the voltage transformer summation current transformer on network system bus is input to real-time control module.
Below in conjunction with accompanying drawing, the invention will be further described:
Describe example in detail as shown in Figure 1, low-voltage bus bar 1 is connected through voltage transformer (PT) 2 summation current transformer (CT) 3 with electric current with voltage by wire, voltage transformer (PT) 2 summation current transformer (CT) 3 is connected with real-time control module by wire, the output of described voltage transformer (PT) 2 summation current transformer (CT) 3 is connected with handing over the input adopting chip respectively, described friendship is adopted chip and is connected by spi bus with single-chip microcomputer, and the control pin of described single-chip microcomputer is connected with control relay.Described control relay output is with on impulse form access capacitor group switching switch.
Specific works mode is: adopt three-phase current and three-phase and four-line voltage as reactive power compensation signal source, three-phase current and three-phase four-wire system voltage are accessed friendship simultaneously and adopts chip, adopt chip by friendship and gather analog signal, calculation process is carried out by single-chip microcomputer, draw corresponding compensation way and compensation capacity, send control level by single-chip microcomputer output pin, control relay utilizes impulse form to send signal.After Intelligent capacitor receives pulse control signal, drop into, excise during current over-zero when zero cross detection circuit detects voltage zero-cross, control capacitor completes and drops into or excision in a cycle, and during input, no-flashy-flow produces, without overvoltage during excision.Ensure the safety of electrical network and custom power equipment.
The control method of the idle compensating control of dynamic phase splitting compensation, comprises the following steps:
(1) access voltage, current signal that the voltage transformer summation current transformer on distribution network system bus exports, be linked into friendship and adopt and count;
(2) according to the definition of reactive power, calculate three phase reactive power by single-chip microcomputer and be respectively compensatory control amount as each phase Capacitor banks;
(3) single-chip microcomputer according to compensatory control amount calculate each need mutually drop into capacitor capacity and can drop into condenser capacity as drop into or excision basis for estimation;
(4) after Intelligent capacitor group receives input or excision order; determine that capacitor drops into or the excision moment by zero cross detection circuit; perform capacitor switching; the Capacitor banks that input capacity is applicable to; make the power factor of each phase more than 0.95; when capacitor drops into excision, follow following Preservation tactics:
1) overvoltage protection: controller is provided with 2 grades of overvoltage protections, when voltage is greater than first order overvoltage action thresholding but is less than second level overvoltage action thresholding, controller does not send the instruction dropping into capacitor, only performs the instruction of excision capacitor; When voltage is greater than second level overvoltage action thresholding, controller excised all capacitors by platform in 1 minute,
2) under-voltage protection: controller has under-voltage protection function, when voltage is less than under voltage action thresholding, excises all capacitors immediately,
3) open-phase protection: controller has default-phase protection function, when there is open-phase protection, excises all capacitors immediately,
4) harmonic protection is crossed: controller has overvoltage and overcurrent harmonic protection function, and when voltage harmonic or current harmonics are greater than set action thresholding, controller excises all capacitors immediately,
5) step (1) ~ (4) are repeated, can the change of follow load, realize reactive-load dynamic compensation.
Claims (3)
1., based on the idle compensating control of dynamic phase splitting compensation, it is characterized in that comprising Current Transmit, voltage transformer pt, real-time control module, Intelligent capacitor; Wherein the first signal input/output end of Current Transmit, the first signal input/output end corresponding first signal input/output terminal of connection bus, the secondary signal input/output terminal of bus of voltage transformer pt, the secondary signal input/output end correspondence of Current Transmit, voltage transformer pt connects first, second signal input/output terminal of real-time control module, and the signal input/output end correspondence of Intelligent capacitor connects the 3rd signal input/output terminal of real-time control module.
2. the idle compensating control based on dynamic phase splitting compensation according to claim 1, is characterized in that described Intelligent capacitor is made up of capacitor, zero cross detection circuit, wherein every four groups mutually of capacitor, and capacity distributes by 1: 2: 4: 8, phase-splitting, classification switching.
3. the idle compensating control based on dynamic phase splitting compensation according to claim 1, is characterized in that described real-time control module comprises control relay, chip, power supply unit are adopted in single-chip microcomputer, friendship; The signal input/output end that wherein chip is adopted in control relay, single-chip microcomputer, friendship is connected in series successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520419987.0U CN204741280U (en) | 2015-06-18 | 2015-06-18 | Reactive compensation controller based on developments phase separating compensation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520419987.0U CN204741280U (en) | 2015-06-18 | 2015-06-18 | Reactive compensation controller based on developments phase separating compensation |
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| CN204741280U true CN204741280U (en) | 2015-11-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882894A (en) * | 2015-06-18 | 2015-09-02 | 南京新联能源技术有限责任公司 | Reactive compensation controller based on dynamic phase-splitting compensation and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882894A (en) * | 2015-06-18 | 2015-09-02 | 南京新联能源技术有限责任公司 | Reactive compensation controller based on dynamic phase-splitting compensation and control method thereof |
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