CN108075671A - A kind of flickering isolating device - Google Patents
A kind of flickering isolating device Download PDFInfo
- Publication number
- CN108075671A CN108075671A CN201610989965.7A CN201610989965A CN108075671A CN 108075671 A CN108075671 A CN 108075671A CN 201610989965 A CN201610989965 A CN 201610989965A CN 108075671 A CN108075671 A CN 108075671A
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- China
- Prior art keywords
- flickering
- voltage
- igbt
- isolating device
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of flickering isolating device, including：Sequentially connected by-pass switch module, rectification module, inverter module and LCL filter module.Technical solution provided by the invention solves the flickering caused by shock isolation load, makes influence of the lighting load from flickering, improves electric consumption on lighting environment.When AC system has a power failure, discharge current is controlled, by the residual capacity of storage capacitor, extends lighting hours, realizes emergency lighting.
Description
Technical field
The invention belongs to field of power, in particular to a kind of flickering isolating device.
Background technology
The concept of voltage flicker is visual sense caused by lamp illuminance is unstable.The impacts such as electric arc furnaces, rolling mill, electric welding machine
Load, the amplitude and frequency of the voltage fluctuation and flicker, wherein flickering and voltage fluctuation that in production power supply buses can be caused larger
Rate is related, the caused flickering in the range of 5HZ-10HZ of voltage fluctuation frequency, most sensitive on the visual sense influence of people, works as electric power system
Weaker, the phenomenon that impact load is larger, and the lighting load powered under busbar is often present with light flash, to the vision of people
Impression impacts.
Flickering main inducing is voltage fluctuation caused by impact load, and voltage fluctuation is mainly made by reactive power impact power
Into, it generally all takes and the dynamic passive compensations equipment such as SVC or SVG is installed on impact load power supply buses to be controlled
Reason, after SVC and SVG compensation, voltage fluctuation substantially reduces in amplitude, however very limited to the improvement of flickering.Mainly
The reason is that since SVC and SVG carries out tracing compensation to load reactive power impact, there are the response times, it is impossible to which no time difference tracking is mended
It repays；Except it is idle can cause larger voltage fluctuation in addition to, active power can also cause certain voltage fluctuation；Except voltage fluctuation width
Value is outer, and vibration frequency is also the major reason that flickering generates, therefore, although SVC and SVG in terms of voltage fluctuation amplitude is administered very
Success, but, along with voltage fluctuation caused by the response time difference and active power, caused jointly without improvement for vibration frequency
It is limited to the improvement of flickering.
The content of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of flickering isolating device, and change was moved in the past by parallel connection type
State reactive power compensator administers the limitation of flickering, and the electric energy of AC system is sent into flickering isolating device, is become through isolating device
After changing, then electric energy is sent to lighting system.
A kind of flickering isolating device, which is characterized in that described device includes：Sequentially connected by-pass switch module, rectification
Module, inverter module and LCL filter module.
Further, the by-pass switch module includes：Switch and charging resistor, the quantity of the switch in parallel be
Three, the quantity of the charging resistor is three.
Further,
The rectification module includes three-phase commutation bridge；
The three-phase commutation bridge includes three bridge arms being made of respectively the IGBT of two series connection；
The emitter of an IGBT in same bridge arm is connected with the collector of another IGBT；
A parasitic diode is connected between the emitter and collector of each IGBT；
The collector of three IGBT of wherein one end in three-phase commutation bridge is connected with each other, the hair of three IGBT of the other end
Emitter-base bandgap grading is connected with each other.
Further, the midpoint of three bridge arms of the three-phase commutation bridge respectively with three inductance connections, three electricity
The other end of sense is connected with by-pass switch module.
Further, the inverter module includes three-phase inverter；
The three-phase inverter includes three bridge arms, and each bridge arm is composed in series by two IGBT；
The emitter of an IGBT is connected with the collector of another IGBT in same bridge arm；
A parasitic diode is connected between the emitter and collector of each IGBT；
The collector of three IGBT in three-phase inverter is connected with each other, and the emitter of the other three IGBT is connected with each other.
Further, the midpoint of three bridge arms of the three-phase inverter connects respectively with an inductance of LCL filter module
It connects.
Further, it is parallel with storage capacitor between the rectification module and inverter module.
Further, the LCL filter module includes three-phase LCL filter；
The three-phase LCL filter includes three bridge arms, and each bridge arm is composed in series by two inductance；
Respectively with three capacitance connections, the other ends of three capacitances is connected with each other at the midpoint of three bridge arms.
Further, described device includes the control of energy-storage capacitor voltage and the control of output voltage to the control of voltage
System；
The control of the energy-storage capacitor voltage includes：When condenser voltage is less than 90% rated capacitor voltage,
IGBT controls pulsewidth；
The control of the output voltage includes：The amplitude of output voltage and frequency are adjusted according to prescribed voltage.
Further, described device includes：The identification of normal operation, the system failure, the three kinds of operational modes that have a power failure；
The identification of the system failure includes：
Step 1 judges whether supply voltage falls to 20% supply voltage；
Step 2 judges whether condenser voltage is normal.
Compared with the latest prior art, technical solution provided by the invention has the advantages that：
1st, technical solution provided by the invention makes output voltage controllable, when the system load effect that is hit causes voltage fluctuation
During with flickering, the output voltage of flickering isolating device is unaffected, so as to thoroughly improve due to illumination caused by impact load
System flicker problem.
2nd, the flickering that technical solution provided by the invention can thoroughly caused by shock isolation load, makes lighting load
From the influence of flickering, electric consumption on lighting environment is improved, when AC system has a power failure, discharge current is controlled, by storage
The residual capacity of energy capacitance, extends lighting hours, plays the role of emergency lighting.
Description of the drawings
Fig. 1 is the overall structure topological circuit figure of the present invention；
Fig. 2 is condenser voltage control block diagram；
Fig. 3 is output voltage control block diagram；
Wherein, Rg1-Rg6 and g1-g6 is IGBT device；Vdc be capacitor reference voltage, the voltage that VC is exported in order to control,
Pc is the charge power of capacitor, and PI is the discharge power of capacitor；VI is load voltage reference value, and device output is electric in order to control by Vf
Pressure value, If are load current.
Specific embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
As shown in Figure 1, Fig. 1 is the overall structure topological circuit figure of the present invention, a kind of flickering isolating device includes：Connect successively
By-pass switch module, rectification module, inverter module and the LCL filter module connect.
Be divided into two parts to the control of voltage, one be energy-storage capacitor voltage control, the other is output voltage
Control, energy-storage capacitor voltage control set reference voltage, and provide voltage permission lower limit threshold (90% capacitor volume
Constant voltage), when condenser voltage is less than lower limit threshold value, voltage deviation is adjusted generation target voltage by controller through PI, right
Rg1-Rg6 is controlled, and capacitor is made to charge, and voltage rises, will be by balancing control strategy with energy-storage capacitor input current
Or power and output current or the difference of power are feedback quantity, using condenser voltage as target, by carrying out arteries and veins to IGBT components
Wide modulation control to carry out the control of the balance of condenser voltage, refers to Fig. 2.
Vdc is capacitor reference voltage, and VC is sent to trigger circuit formation trigger signal by the voltage that VC is exported in order to control
It is the charge power of capacitor to control Rg1-Rg6 (see Fig. 3), Pc, and PI is the discharge power of capacitor, to realize condenser voltage
Balance control.
With the lighting voltage of output target in order to control, the amplitude of voltage and the stability contorting of frequency are realized, functional block diagram is detailed
See Fig. 3.
Two voltage independent controls during normal operation only when system appearance exception, carry out interrelated control.When exchange is
After system has a power failure, the energy that energy-storage capacitor provides can be relied on to carry out emergency lighting.
The device includes：The identification of normal operation, the system failure, the three kinds of operational modes that have a power failure；
When system jam, the formulation of control strategy, output voltage and energy-storage capacitor voltage association control and
Pattern-recognition when the system failure, the pattern-recognition of fault type is carried out according to system voltage, (clarification：Identifying system voltage is
No failure, mainly sees whether the system voltage that flickering isolating device measures falls to 20% nominal voltage, if being less than this value,
System failure mode is just identified as, then capacitor voltage is whether within the scope of qualification, if condenser voltage exists
In acceptability limit, then output voltage is carried out by the control strategy under fault condition, if condenser voltage deviates normal range (NR)
Adjust automatically output target voltage controls output current to meet emergency lighting simultaneously) if too low after system voltage failure, storage
The energy target voltage of capacitor and the output current of flickering isolating device need to carry out big adjustment, with the failure feelings of adaptive system
Condition.When system blackout, extension lighting hours, the effect of emergency lighting can reach.
According to systematic parameter and lighting load requirement, determine flickering isolating device parameter, according to the power of lighting load with
And the capacity of the power requirement selection energy-storage capacitor of emergency power supply, according to the voltage of output voltage selection energy-storage capacitor, and
According to more than capacity and voltage selection IGBT components, energy-storage capacitor parameter is checked according to charging and discharging currents intensity and speed.
Controller passes through Hall sensor acquisition system voltage and energy-storage capacitor voltage, charging current, discharge current, photograph
Bright load current；Controller is according to system voltage, energy-storage capacitor voltage, charging current and discharge current, to condenser voltage
Control is balanced, when impact load causes voltage fluctuation, makes energy-storage capacitor voltage stabilization；Using pulse modulation technology pair
The amplitude and frequency of output voltage are controlled, and when band lighting load, make output voltage and frequency stabilization.Using PSCAD pairs
System carries out harmonic wave emulation, determines the capacitance and inductance parameters of the LCL filter of output terminal；PSCAD emulation meters are carried out to system
It calculates, determines the resistance value of charging resistor and power value parameter.
When system jam, the formulation of control strategy and the association of output voltage and energy-storage capacitor voltage control
And during pattern-recognition, especially system blackout, extension lighting hours, the effect of emergency lighting can be reached；
Insulation Coordination sets Zinc-Oxide Arrester according to the over-voltage condition being likely to occur, and protects flickering isolating device, main
Determine rated voltage, reference voltage, residual voltage and the discharge capacity of Zinc-Oxide Arrester.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described in detail the present invention with reference to above-described embodiment, those of ordinary skills in the art should understand that：Still
The specific embodiment of the present invention can be modified or replaced equivalently, and without departing from any of spirit and scope of the invention
Modification or equivalent substitution, should be covered by the scope of the claims of the present invention.
Claims (10)
1. a kind of flickering isolating device, which is characterized in that described device includes：Sequentially connected by-pass switch module, rectification mould
Block, inverter module and LCL filter module.
2. a kind of flickering isolating device as described in claim 1, which is characterized in that the by-pass switch module includes：It is in parallel
Switch and charging resistor, the quantity of the switch be three, the quantity of the charging resistor is three.
3. a kind of flickering isolating device as described in claim 1, which is characterized in that the rectification module includes three phase rectifier
Bridge；
The three-phase commutation bridge includes three bridge arms being made of respectively the IGBT of two series connection；
The emitter of an IGBT in same bridge arm is connected with the collector of another IGBT；
A parasitic diode is connected between the emitter and collector of each IGBT；
The collector of three IGBT of wherein one end in three-phase commutation bridge is connected with each other, the emitter of three IGBT of the other end
It is connected with each other.
4. a kind of flickering isolating device as claimed in claim 3, which is characterized in that three bridge arms of the three-phase commutation bridge
Respectively with three inductance connections, the other end of three inductance is connected with by-pass switch module at midpoint.
5. a kind of flickering isolating device as described in claim 1, which is characterized in that the inverter module includes three-phase inversion
Device；
The three-phase inverter includes three bridge arms, and each bridge arm is composed in series by two IGBT；
The emitter of an IGBT is connected with the collector of another IGBT in same bridge arm；
A parasitic diode is connected between the emitter and collector of each IGBT；
The collector of three IGBT in three-phase inverter is connected with each other, and the emitter of the other three IGBT is connected with each other.
6. a kind of flickering isolating device as claimed in claim 5, which is characterized in that three bridge arms of the three-phase inverter
The midpoint inductance connection with LCL filter module respectively.
7. a kind of flickering isolating device as described in claim 1, which is characterized in that between the rectification module and inverter module simultaneously
It is associated with storage capacitor.
8. a kind of flickering isolating device as described in claim 1, which is characterized in that the LCL filter module includes three-phase
LCL filter；
The three-phase LCL filter includes three bridge arms, and each bridge arm is composed in series by two inductance；
Respectively with three capacitance connections, the other ends of three capacitances is connected with each other at the midpoint of three bridge arms.
9. a kind of flickering isolating device as described in claim 1, which is characterized in that described device includes storage to the control of voltage
It can the control of condenser voltage and the control of output voltage；
The control of the energy-storage capacitor voltage includes：When condenser voltage is less than 90% rated capacitor voltage, IGBT controls
Pulsewidth processed；
The control of the output voltage includes：The amplitude of output voltage and frequency are adjusted according to prescribed voltage.
10. a kind of flickering isolating device as described in claim 1, which is characterized in that described device includes：Normal operation is
The identification for the failure, the three kinds of operational modes that have a power failure of uniting；
The identification of the system failure includes：
Step 1 judges whether supply voltage falls to 20% supply voltage；
Step 2 judges whether condenser voltage is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989965.7A CN108075671A (en) | 2016-11-10 | 2016-11-10 | A kind of flickering isolating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989965.7A CN108075671A (en) | 2016-11-10 | 2016-11-10 | A kind of flickering isolating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108075671A true CN108075671A (en) | 2018-05-25 |
Family
ID=62154328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610989965.7A Pending CN108075671A (en) | 2016-11-10 | 2016-11-10 | A kind of flickering isolating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108075671A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862906A (en) * | 2006-06-01 | 2006-11-15 | 西安交通大学 | Series active AC voltage quality regulator and controlling method |
| CN202797941U (en) * | 2012-08-28 | 2013-03-13 | 西安布伦帕电力无功补偿技术有限公司 | Voltage fluctuation and flickering suppressor for power supply system |
| CN203942283U (en) * | 2014-06-13 | 2014-11-12 | 华南理工大学 | A kind of three-phase steady state voltage quality control apparatus |
-
2016
- 2016-11-10 CN CN201610989965.7A patent/CN108075671A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862906A (en) * | 2006-06-01 | 2006-11-15 | 西安交通大学 | Series active AC voltage quality regulator and controlling method |
| CN202797941U (en) * | 2012-08-28 | 2013-03-13 | 西安布伦帕电力无功补偿技术有限公司 | Voltage fluctuation and flickering suppressor for power supply system |
| CN203942283U (en) * | 2014-06-13 | 2014-11-12 | 华南理工大学 | A kind of three-phase steady state voltage quality control apparatus |
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| PB01 | Publication | ||
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Application publication date: 20180525 |