CN204304439U - A kind of three-phase imbalance reactive power compensator based on DSP - Google Patents
A kind of three-phase imbalance reactive power compensator based on DSP Download PDFInfo
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- CN204304439U CN204304439U CN201420673112.9U CN201420673112U CN204304439U CN 204304439 U CN204304439 U CN 204304439U CN 201420673112 U CN201420673112 U CN 201420673112U CN 204304439 U CN204304439 U CN 204304439U
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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
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- 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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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
Based on a three-phase imbalance reactive power compensator of DSP, comprise current transformer, exchange plug-in unit, A/D converter, also comprise idle compensating control, actuator, electron recombination switch and compensating element.Described idle compensating control is made up of CPU, AC module, power module, outlet module, human-computer dialogue plate.Described electron recombination switch is formed by thyristor is in parallel with A.C. contactor, described electron recombination switch in moment of capacitor group switching based on thyristor switch, then thyristor switch is exited, with the contact of A.C. contactor by capacitive load electric current during capacitor puts into operation.Idle compensating control is the DSP design based on 16, and fast response time, control simple, dependable performance, man-machine interface is friendly, easy to operate.Controller can carry out dynamic tracing compensation to low-voltage network is idle, and can also alleviate the degree of unbalance of low-voltage load, thus reaches the object reducing network loss.The utility model is applicable to the low-pressure reactive compensation of electrical network.
Description
Technical field
The utility model relates to a kind of three-phase imbalance reactive power compensator based on DSP, belongs to electric reactive compensating technical field.
Background technology
At present in China, for low voltage electric network, generally all adopt three-phase four-wire system distribution system, distribution transformer is Y/yn0 wiring.Due to a large amount of single-phase loads and electricity consumption asynchronism, therefore the three-phase imbalance of distribution transformer runs is inevitable.
Three-phase voltage or the asymmetric meeting of electric current cause a series of harm to the generating in electric power system, transmission of electricity, controller switching equipment and power consumption equipment: add line loss; Add the active loss of distribution transformer; Reduce distribution transformer to exert oneself; Affect output power of motor, and winding temperature is raised; Affect proper communication quality; Can have an impact to the precision of some measuring instruments.
At present in Distribution network, the Capacitor banks of switching manually or automatically is extensively adopted to compensate.Even but state-of-the-art thyristor phase-splitting opening-closing capacitor bank, also can only solve the compensation problem of power factor, and effectively can not balance three-phase load.
In current electrical network, the reactive power compensator of use is generally synchronous compensator, static passive compensation device, shunt capacitor etc.
Synchronous compensator can regulate idle size by adjustment excitation independently, has larger capability of overload.Shortcoming is: equipment investment is high; Start, run, keep in repair complexity; Dynamic adjustments low-response; Inadaptable too large or too little compensation; By the voltage fluctuation of heavy system during generation loss of excitation fault.
Static passive compensation device has the ability absorbing or send reactive current, has the power factor of raising system, systems stabilisation voltage, suppresses the functions such as system oscillation.Current this rest switch is mainly divided into two kinds, i.e. circuit breaker and electronic power switch.Due to slower as the switching speed of contactor with circuit breaker, be about 10s ~ 30s, the change of load reactive power can not be followed the tracks of fast, and serious impulse current and switching overvoltage may be caused during switched capacitor, contact point is so not only easily caused to freeze, and compensation condenser internal breakdown may be made, suffered stress is large, and maintenance capacity is large.
Parallel capacitive compensation forever can connect or is connected on some node of system with circuit breaker.Compare with compensator, its advantage is: reduced investment, economical operation, structure are simple, easy to maintenance, capacity can be selected arbitrarily, practical.Shortcoming is: idle output is non-adjustable, and has amplification to the high order harmonic component in system, when harmonic current is excessive, may set off an explosion.
And these devices above all can not reduce tri-phase unbalance factor effectively, easily cause network loss bigger than normal.
Summary of the invention
The purpose of this utility model is, according to existing reactive power compensator Problems existing, the utility model proposes a kind of three-phase imbalance reactive power compensator based on DSP, carries out switching carry out compensating reactive power with electron recombination Switch Controller Capacitor banks.
Realizing the technical solution of the utility model is:
A kind of three-phase imbalance reactive power compensator based on DSP of the utility model, comprises current transformer, voltage transformer, A/D converter, also comprises idle compensating control, AC sampling module, electron recombination switch, actuator and compensating element.Current transformer and secondary windings of PT leading-out terminal are connected AC sampling module respective input mouth respectively; The output of AC sampling module connects A/D converter input; The output of A/D converter connects the input of idle compensating control; Idle compensating control connects actuator, and actuator connects electron recombination switch, and electron recombination switch connects compensating element.
The idle compensating control of the utility model device is made up of CPU, AC module, power module, outlet module, human-computer dialogue plate, and CPU, AC module, power module etc. are integrated on one block of main circuit board MAIN plate; Outlet module and human-computer dialogue plate are independently one piece of circuit board respectively, drive by DSP.
The CPU of the idle compensating control of the utility model device adopts DSP56F807 chip, described chip has multiple I/O mouth and multiple ancillary equipment, has the data RAM memory of the program FLASH memory of 60K × 16, the program RAM memory of 2K × 16, the data FLASH memory of 8K × 16,4K × 16 simultaneously.
The electron recombination switch of the utility model device is formed by thyristor is in parallel with A.C. contactor.Described electron recombination switch makes full use of thuristor throw-in and throw-off time controling advantage accurately, in moment of capacitor group switching based on thyristor switch, then thyristor switch is exited, with the contact of A.C. contactor by capacitive load electric current during capacitor puts into operation.
The actuator of the utility model device is one block of digital output circuit plate, this block plate has 30 relays, can control 30 single phase ac contactors, also has 24 optocouplers in addition, can control 24 controllable silicons, complete the switching of capacitor.
The compensating element, of the utility model device is furnished with 4 groups of Y shape capacitors altogether, 4 groups of △ shape capacitors; In order to realize phase splitting compensation and three-phase equilibrium process, realizing single capacitor can independent switching, point volume controlled.
The beneficial effects of the utility model are: the utility model Setup Controller is the DSP design based on 16, and fast response time, can carry out dynamic tracing compensation to low-voltage network is idle.And controlling simple, dependable performance, man-machine interface is friendly, easy to operate.The hardware of the utility model Setup Controller have employed modularized design, be, according to the function of specific implementation, Setup Controller is divided into CPU module, AC module, power module, outlet module and human-computer dialogue plate, reached the object of device global design by the design completing modules.And adopt modularized design can the versatility of intensifier, such as by change modules compound mode or by changing certain module, realize new function, the development cost of relevant apparatus can be reduced like this, shorten the development time.It is compensating element, that the utility model device have employed Capacitor banks that is star-like, angle-style mixing connection, the control mode of AB, BC, CA, A, B, C capacitor inequality switching is adopted in switching process, can ensure under the prerequisite that three-phase burden with power total amount is constant, three-phase imbalance load is changed into balanced load, and the power factor of each phase can be improved.The electron recombination switch that the utility model device adopts makes full use of thuristor throw-in and throw-off time controling advantage accurately, in moment of capacitor group switching based on thyristor switch, then thyristor switch is exited, with the contact of A.C. contactor by capacitive load electric current during capacitor puts into operation.So electron recombination switch fully can ensure the operational reliability of ac contactor contact under frequent operation, again reduce the power consumption of switch element.
Accompanying drawing explanation
Fig. 1 is low-voltage reactive compensator capable controller hardware structure chart;
Fig. 2 is the structure diagram of electron recombination switch;
Fig. 3 is that Δ shape connection mends Capacitor banks altogether;
Fig. 4 is Δ shape connection phase-splitting controllable capacitor group;
Fig. 5 is star connection Capacitor banks;
Fig. 6 is the star connection Capacitor banks that adjacent two-phase shares.
Embodiment
A kind of three-phase imbalance reactive power compensator based on DSP of the present embodiment assembles with the form of a screen cabinet.Except idle compensating control is installed, further provided with the parts such as electric capacity, current transformer, air switch, electron recombination switch in reactive compensation cabinet.Its controller with digital signal processor DSP 56F807 for core; integrate power network monitoring and the control of reactive power compensating, capacitor protection; not only can reactive requirement in compensation network; improve power factor; reduce degree of unbalance, reduce line loss, thus improve load capacity and the power supply quality of electrical network; simultaneously can also the service data such as three-phase voltage, electric current, power factor of Real-Time Monitoring electrical network, complete the integrated managements such as the monitoring to whole low-voltage distributing line, analyzing and processing.Idle compensating control hardware configuration as shown in Figure 1.
As can be seen from Figure 1, the power current that amplitude is larger, voltage signal become the less AC signal of amplitude through exchanging plug-in unit (AC plug-in unit), then AC sampling is carried out by DSP, and calculate every electrical network parameter, then export control signal to actuator according to control law by serial ports.Actuator is actually one block of digital output circuit plate, this block plate has 30 relays, can control 30 single phase ac contactors, also has 24 optocouplers in addition, can control 24 controllable silicons, complete the switching of capacitor.
The DSP56F807 chip that the hardware of the present embodiment device is produced with motorola inc is for core.It has abundant I/O mouth and multiple ancillary equipment, has the data RAM memory of the program FLASH memory of 60K × 16, the program RAM memory of 2K × 16, the data FLASH memory of 8K × 16,4K × 16 simultaneously.The controller of reactive power compensator adopts the design philosophy of function modoularization, and be conducive to the versatility improving device hardware like this, namely the part of difference in functionality can combine configuration on demand by identical each functional unit, achieves the standardization of functional module.This controller is made up of CPU, AC module, power module, outlet module, human-computer dialogue plate, and CPU, AC module, power module etc. are integrated on one block of main circuit board MAIN plate.Outlet module and human-computer dialogue plate are independently one piece of circuit board respectively, drive by DSP.After employing the present embodiment the control of reactive power compensating technology, secondary capacitor group will increase a large amount of fling-cut switch.As the operation executive component of capacitor switching process, its power consumption size, performance quality plays important effect to the reliability of low-voltage reactive compensator capable and power consumption.
The electron recombination switch of the present embodiment is the product that thyristor combines with A.C. contactor, as shown in Figure 2.It makes full use of thuristor throw-in and throw-off time controling advantage accurately, in moment of capacitor group switching based on thyristor switch, then exits thyristor switch, with the contact of A.C. contactor by capacitive load electric current in capacitor period of putting into operation.
The concrete compensation process of the present embodiment low-voltage reactive compensator capable is:
The present embodiment low-voltage reactive power control device needs the low voltage voltage gathered through air switch 3ZK introducing device PT, as the voltage signal of device.And current signal accesses by the empty 1ZK that opens the current transformer BH-0.66CT that no-load voltage ratio is 50/5A, the then inner CT of introducing device, as the current signal of device.The power supply of controller itself opens 2ZK through sky to introduce 220V electric main.Compensating cabinet is furnished with 4 groups of Y shape capacitors altogether, 4 groups of △ shape capacitors.In order to realize phase splitting compensation and three-phase equilibrium process, realizing single capacitor can independent switching, point volume controlled.Wherein 25JK ~ 30JK is the reversing phase switch of star-like phase-splitting part, employing be single phase ac contactor, and KP is electron recombination switch, is used for connecting or excision electric capacity.
The present embodiment is idle, and extending controller has 30 optocoupler output signals, can control the output of 30 controllable silicons (i.e. thyristor); 30 relay output signals, can control the output of 30 single phase ac contactors.Wherein A.C. contactor is the single-phase contactor of KMC series of Kai Si KACOM company of Korea S, and the specification that we select is rated current is the KMC-30S type of 30A and the KMC-50S type single phase ac contactor of 50A.
The present embodiment low-voltage reactive compensator capable is to increase the flexibility that each phase Capacitor banks drops into Capacity Selection to the maximum difference that Capacitor banks configures with conventional reactive power compensator.The compensation configuration mode of secondary capacitor group is as follows:
(1) the common benefit Capacitor banks connection of original Δ shape connection as shown in Figure 3, change Δ shape connection phase-splitting controllable capacitor group into, the Δ shape Capacitor banks connection that namely AB, BC, CA are controlled respectively as shown in Figure 4.
The Δ shape connection of Fig. 5 can throw the capacitor of AB, BC or CA phase by electron recombination switch unrestricted choice such as KP1, KP2, KP3, realize the capacitor switching of the alternate inequality of three-phase.The Δ shape connection phase-splitting controllable capacitor pool-size of different capabilities can according to the Capacity Selection of distribution transformer, and what this device configured has 3Kvar, 4Kvar, 8Kvar, 12Kvar equal-specification.
In actual the control of reactive power compensating, in order to three-phase imbalance load is converted into three-phase balancing load, the alternate input capacitance of the Capacitor banks that device algorithm provides does not wait.Device drops into Cab, Cbc, Cca Capacitor banks respectively by according to the close capacity of Capacity Selection of actual Δ shape wiring capacitance device group.
(2) point mend Capacitor banks as shown in Figure 5 star connection, change Capacitor banks connection that adjacent two-phase can share into as shown in Figure 6.
(KA, KB are reversing phase switch to the star Capacitor banks of Fig. 6 for a change connection, are made up of A.C. contactor; KP1, KP2, KP3 are then electron recombination switch), be A phase compensation capacitor group when KA closes (KB divides); If when changing KB conjunction (KA divides) into, then can be B phase compensation capacitor group.Its objective is the flexibility of the configuration mode that Capacitor banks drops into when being embodied as phase-splitting inequality capacitance compensation.
In actual the control of reactive power compensating, in order to three-phase imbalance load is converted into three-phase balancing load, it is also do not wait that the three-phase condenser bank phase-splitting that device algorithm provides drops into capacitance.Device drops into each phase capacitor of Ca, Cb, Cc respectively by according to the close capacity of the Capacity Selection of star connection Capacitor banks.
(3) what deserves to be explained is, capacity due to Capacitor banks manufacture is classification, in working control, we cannot compensate accurately according to Ca, Cb, Cc, Cab, Cbc, Cca capacitance compensation value of theory calculate, and therefore this control has differential control.We can only find a kind of immediate switching control program under capacity of capacitor bank configures limited condition.
Claims (6)
1. the three-phase imbalance reactive power compensator based on DSP, comprise current transformer, voltage transformer, A/D converter, it is characterized in that, described device also comprises idle compensating control, AC sampling module, electron recombination switch, actuator and compensating element;
Current transformer and secondary windings of PT leading-out terminal are connected AC sampling module respective input mouth respectively; The output of AC sampling module connects A/D converter input; The output of A/D converter connects the input of idle compensating control; Idle compensating control connects actuator, and actuator connects electron recombination switch, and electron recombination switch connects compensating element.
2. according to claim 1 based on the three-phase imbalance reactive power compensator of DSP, it is characterized in that, described idle compensating control is made up of CPU, AC module, power module, outlet module, human-computer dialogue plate; CPU, AC module, power module are integrated on one block of main circuit board MAIN plate; Outlet module and human-computer dialogue plate are independently one piece of circuit board respectively, drive by DSP.
3. according to claim 1 based on the three-phase imbalance reactive power compensator of DSP, it is characterized in that, described electron recombination switch is formed by thyristor is in parallel with A.C. contactor.
4. according to claim 1 based on the three-phase imbalance reactive power compensator of DSP, it is characterized in that, described actuator is one block of digital output circuit plate, this block plate has 30 relays, 30 single phase ac contactors can be controlled, also have 24 optocouplers in addition, 24 controllable silicons can be controlled, complete the switching of capacitor.
5. according to claim 1 based on the three-phase imbalance reactive power compensator of DSP, it is characterized in that, described compensating element, is furnished with 4 groups of Y shape capacitors altogether, 4 groups of △ shape capacitors; In order to realize phase splitting compensation and three-phase equilibrium process, realizing single capacitor can independent switching, point volume controlled.
6. according to claim 3 based on the three-phase imbalance reactive power compensator of DSP, it is characterized in that, described idle compensating control adopts DSP56F807 chip, described chip has multiple I/O mouth and multiple ancillary equipment, has the data RAM memory of the program FLASH memory of 60K × 16, the program RAM memory of 2K × 16, the data FLASH memory of 8K × 16,4K × 16 simultaneously.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262110A (en) * | 2015-11-02 | 2016-01-20 | 国网河南方城县供电公司 | Dynamic reactive compensation system |
| CN105337296A (en) * | 2015-10-14 | 2016-02-17 | 国家电网公司 | Balance compensation device of low-voltage power grid |
| CN105958510A (en) * | 2016-06-18 | 2016-09-21 | 南京采薇且歌信息科技有限公司 | SOC chip for power grid monitoring and control equipment |
| CN106208107A (en) * | 2016-08-30 | 2016-12-07 | 泉州维盾电气有限公司 | A kind of novel low-voltage reactive compensation control device |
| CN109213046A (en) * | 2018-10-22 | 2019-01-15 | 国网江西省电力有限公司电力科学研究院 | A kind of power quality general controls platform based on ARM+FPGA |
| CN109946493A (en) * | 2019-04-15 | 2019-06-28 | 福建省水利水电勘测设计研究院 | A kind of metering CT and PT load compensation monitor |
| CN113922387A (en) * | 2021-10-14 | 2022-01-11 | 贵州电网有限责任公司 | Based on portable reactive power compensator in modularization low-voltage transformer district |
-
2014
- 2014-11-13 CN CN201420673112.9U patent/CN204304439U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337296A (en) * | 2015-10-14 | 2016-02-17 | 国家电网公司 | Balance compensation device of low-voltage power grid |
| CN105262110A (en) * | 2015-11-02 | 2016-01-20 | 国网河南方城县供电公司 | Dynamic reactive compensation system |
| CN105958510A (en) * | 2016-06-18 | 2016-09-21 | 南京采薇且歌信息科技有限公司 | SOC chip for power grid monitoring and control equipment |
| CN106208107A (en) * | 2016-08-30 | 2016-12-07 | 泉州维盾电气有限公司 | A kind of novel low-voltage reactive compensation control device |
| CN109213046A (en) * | 2018-10-22 | 2019-01-15 | 国网江西省电力有限公司电力科学研究院 | A kind of power quality general controls platform based on ARM+FPGA |
| CN109946493A (en) * | 2019-04-15 | 2019-06-28 | 福建省水利水电勘测设计研究院 | A kind of metering CT and PT load compensation monitor |
| CN113922387A (en) * | 2021-10-14 | 2022-01-11 | 贵州电网有限责任公司 | Based on portable reactive power compensator in modularization low-voltage transformer district |
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