CN107154632A - A kind of recognition methods of power unit by-pass state - Google Patents
A kind of recognition methods of power unit by-pass state Download PDFInfo
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- CN107154632A CN107154632A CN201710479516.2A CN201710479516A CN107154632A CN 107154632 A CN107154632 A CN 107154632A CN 201710479516 A CN201710479516 A CN 201710479516A CN 107154632 A CN107154632 A CN 107154632A
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- power cell
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- 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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of recognition methods of power unit by-pass state, when this method makes full use of the SVG to start, detected by the voltage of the dc-link capacitance in parallel to each power cell, the capacitance voltage of each power cell and reference voltage are contrasted, judge the bypass condition of each power cell；This method is the bypass condition that power cell is automatically confirmed that in dc-link capacitance charging process, without increasing hardware detecting circuit, the reliability and safety before SVG operations is effectively guaranteed, while reducing product cost.
Description
Technical field
The present invention relates to power in electric and electronic technical field, more particularly to a kind of cascaded H-bridges static reacance generator SVG
The recognition methods of unit bypass state.
Background technology
Many level topological structures are typically used for the SVG main circuits of high-voltage large-capacity, relative to other many level topologys
Structure, the H cascade connection type topological structures advantage such as have modularization, easy to maintenance, required component few.And the SVG of cascaded topology is set
It is standby, because complete machine internal power number of unit is more, machine failure rate is doubled after the fault rate accumulation of single power cell, significantly
Mean time between failures are reduced, equipment downtime caused by the damage to avoid any power cell, generally using power
The method of unit bypass, reduces the fault rate of complete machine.
In order to ensure the safe and reliable of equipment operation, for possessing the equipment of bypass functionality, before equipment investment work,
It is necessary to confirm its power unit by-pass state, so that it is guaranteed that equipment normal boot-strap.If the bypass of power cell in controller
State and its virtual condition are inconsistent, and device power runs the loss for being likely to result in personnel and property, manually operate to examine
Look into whether the two corresponds to, there is intricate operation, error-prone.
The content of the invention
For the deficiencies in the prior art, the present invention provides a kind of recognition methods of power unit by-pass state, should
When method makes full use of the SVG to start, dc-link capacitance charging process automatically confirms that the bypass condition of power cell, effective to protect
The reliability and safety before SVG operations is demonstrate,proved.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of recognition methods of power unit by-pass state, it is adaptable to cascaded H-bridges static reacance generator SVG, the SVG
It is connected by killer switch QS with power network, the SVG is made up of three-phase circuit, it is every to be sequentially connected in series by multiple power cells
Connection, the output end of three-phase series is connected to neutral point N, and the input being often in series is connected by circuit breaker Q S with power network；
Power cell in the every phases of the SVG is by DC/DC conversion modules, IGBT module, bypass module and control unit
Composition, the AC of the IGBT module is parallel with bypass module, and the DC side parallel of IGBT module has stream bus capacitor C, directly
Stream bus capacitor C rear class is parallel with DC/DC converter units, the output end of the DC/DC converter units and the electricity of control unit
Source is connected, for providing operating voltage to control unit；The signal output part of described control unit respectively with IGBT module
Switch drive input, the switch drive end of bypass module be connected, for controlling respectively to open in IGBT module and bypass module
The working condition of pipe is closed, while PORT COM, the communication terminal of bypass module of the communication terminal of control unit respectively with IGBT module
Mouth is connected, for receiving voltage and current parameters in IGBT module and bypass module；The exchange input of the IGBT module
End is connected with the ac output end of upper level power cell IGBT module, the ac output end and next stage of the IGBT module
The ac input end of power cell IGBT module is connected；
The recognition methods of the power unit by-pass state, specific method step is as follows：
The first step：The killer switch QS that closure SVG is connected with power network first, power network is accessed by SVG；
Second step：Dc-link capacitance C in SVG in each power cell enters the charging stage, detects in each power cell
The voltage U at dc-link capacitance C two endsn；
3rd step：By the magnitude of voltage U detectednWith the standard voltage value U set in systemref(dc-link capacitance is full of
Magnitude of voltage after electricity) it is compared, if Un≥Uref, by corresponding power cell labeled as " 0 " is not bypassed, conversely, will be corresponding
Power cell is labeled as bypass " 1 "；
4th step：For the power cell labeled as non-bypass mark " 0 ", being further continued for operation T, (T compares dc-link capacitance
Charging interval it is bigger) after the moment, detect the voltage U of the dc-link capacitance of power cellnIf, Un≥Uref, then correspondence is judged
Power cell is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to power list
The voltage U of the dc-link capacitance of membernDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if
Un<Uref, then into disorderly closedown processing routine；
5th step：For the power cell labeled as bypass mark " 1 ", being further continued for operation T, (T is than dc-link capacitance
Charging interval is bigger) after the moment, detect the voltage U of the dc-link capacitance of power cellnIf, Un≥Uref, then correspondence work(is judged
Rate unit is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to power cell
Dc-link capacitance voltage UnDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if Un
<Uref, then judge that correspondence power cell is in bypass condition；
6th step：The bypass identification record of system is changed according to the result of determination of each power cell；
7th step：Power unit by-pass state recognition terminates.
Beneficial effects of the present invention are as follows：
1. the detection recognition method is the operation principle using circuit itself, it is identified, can be lifted in system operation
Efficiency, it is to avoid manually-operated poorly efficient.
2. the bypass condition of power cell is judged by the operating relevant information of detecting system, it is not necessary to extra increase
Hardware circuit, cost is low.
Brief description of the drawings
Fig. 1 SVG system block diagrams.
Each power cell internal circuit diagrams of Fig. 2.
Fig. 3 power unit by-pass state identification method flow charts.
Embodiment
To make those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings and specific embodiment party
Recognition methods of the formula to power unit by-pass state is described in further detail.
Fig. 1 is SVG system block diagrams, as illustrated, SVG is connected by killer switch QS with power network, the SVG is by three
Circuitry phase is constituted, and per being sequentially connected in series by multiple power cells, the output end of three-phase series is connected to neutral point N, per phase
The input of series connection is connected by circuit breaker Q S with power network.
Fig. 2 is each power cell internal circuit diagram, as illustrated, the power cell in the every phases of the SVG is become by DC/DC
Block, IGBT module, bypass module and control unit composition are changed the mold, the AC of the IGBT module is parallel with bypass module,
The DC side parallel of IGBT module has stream bus capacitor C, and dc-link capacitance C rear class is parallel with DC/DC converter units, described
The output end of DC/DC converter units is connected with the power end of control unit, for providing operating voltage to control unit.It is described
The signal output part of control unit switch drive input respectively with IGBT module, the switch drive end of bypass module are connected
Connect, the working condition for controlling each switching tube in IGBT module and bypass module, at the same the communication terminal of control unit respectively with
The PORT COM of IGBT module, the PORT COM of bypass module are connected, for receiving the electricity in IGBT module and bypass module
Pressure and current parameters；The ac input end of the IGBT module is connected with the ac output end of upper level power cell IGBT module
Connect, the ac output end of the IGBT module is connected with the ac input end of next stage power cell IGBT module.
Fig. 3 is power unit by-pass state identification method flow chart, as illustrated, a kind of knowledge of power unit by-pass state
Other method, specific method step is as follows：
The first step：The killer switch QS that closure SVG is connected with power network first, power network is accessed by SVG；
Second step：Dc-link capacitance C in SVG in each power cell enters the charging stage, detects in each power cell
The voltage U at dc-link capacitance C two endsn；
3rd step：By the magnitude of voltage U detectednWith the standard voltage value U set in systemref(dc-link capacitance is full of
Magnitude of voltage after electricity) it is compared, if Un≥Uref, by corresponding power cell labeled as " 0 " is not bypassed, conversely, will be corresponding
Power cell is labeled as bypass " 1 "；
4th step：For the power cell labeled as non-bypass mark " 0 ", being further continued for operation T, (T compares dc-link capacitance
Charging interval it is bigger) after the moment, detect the voltage U of the dc-link capacitance of power cellnIf, Un≥Uref, then correspondence is judged
Power cell is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to power list
The voltage U of the dc-link capacitance of membernDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if
Un<Uref, then into disorderly closedown processing routine；
5th step：For the power cell labeled as bypass mark " 1 ", being further continued for operation T, (T is than dc-link capacitance
Charging interval is bigger) after the moment, detect the voltage U of the dc-link capacitance of power cellnIf, Un≥Uref, then correspondence work(is judged
Rate unit is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to power cell
Dc-link capacitance voltage UnDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if Un
<Uref, then judge that correspondence power cell is in bypass condition；
6th step：The bypass identification record of system is changed according to the result of determination of each power cell；
7th step：Power unit by-pass state recognition terminates.
Claims (1)
1. a kind of recognition methods of power unit by-pass state, it is adaptable to which cascaded H-bridges static reacance generator SVG, the SVG are logical
Cross killer switch QS with power network to be connected, the SVG is made up of three-phase circuit, it is every to be sequentially connected in series company by multiple power cells
Connect, the output end of three-phase series is connected to neutral point N, and the input being often in series is connected by circuit breaker Q S with power network；
Power cell in the every phases of the SVG is made up of DC/DC conversion modules, IGBT module, bypass module and control unit,
The AC of the IGBT module is parallel with bypass module, and the DC side parallel of IGBT module has dc-link capacitance C, and direct current is female
Line capacitance C rear class is parallel with DC/DC converter units, the output end of the DC/DC converter units and the power end of control unit
It is connected, for providing operating voltage to control unit；The signal output part of described control unit is opened with IGBT module respectively
Close driving input, the switch drive end of bypass module to be connected, for controlling each switching tube in IGBT module and bypass module
Working condition, while the communication terminal of control unit PORT COM respectively with IGBT module, the PORT COM phase of bypass module
Connection, for receiving voltage and current parameters in IGBT module and bypass module；The ac input end of the IGBT module with
The ac output end of upper level power cell IGBT module is connected, ac output end and the next stage power of the IGBT module
The ac input end of unit IGBT module is connected；
It is characterized in that：The recognition methods of the power unit by-pass state, specific method step is as follows：
The first step：The killer switch QS that closure SVG is connected with power network first, power network is accessed by SVG；
Second step：Dc-link capacitance C in SVG in each power cell enters the charging stage, detects direct current in each power cell
The voltage U at bus capacitor C two endsn；
3rd step：By the magnitude of voltage U detectednWith the standard voltage value U set in systemrefI.e. dc-link capacitance it is fully charged after
Magnitude of voltage be compared, if Un≥Uref, by corresponding power cell labeled as not bypassing " 0 ", conversely, by corresponding power
Unit is labeled as bypass " 1 "；
4th step：For the power cell labeled as non-bypass mark " 0 ", it is further continued for after the operation T moment, detection power cell
The voltage U of dc-link capacitancen, wherein T is longer than the charging interval of dc-link capacitance, if Un≥Uref, then correspondence power is judged
Unit is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to power cell
The voltage U of dc-link capacitancenDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if Un<
Uref, then into disorderly closedown processing routine；
5th step：For the power cell labeled as bypass mark " 1 ", it is further continued for after the operation T moment, detects the straight of power cell
Flow the voltage U of bus capacitorn, wherein T is longer than the charging interval of dc-link capacitance, if Un≥Uref, then correspondence power list is judged
Member is in non-bypass condition, if Un<Uref, then corresponding power cell was continued to run with after the T moment, then to the straight of power cell
Flow the voltage U of bus capacitornDetected, if Un≥Uref, then judge that correspondence power cell is in non-bypass condition, if Un<
Uref, then judge that correspondence power cell is in bypass condition；
6th step：The bypass identification record of system is changed according to the result of determination of each power cell；
7th step：Power unit by-pass state recognition terminates.
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| CN201710479516.2A CN107154632B (en) | 2017-06-22 | 2017-06-22 | A kind of recognition methods of power unit by-pass state |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109039041A (en) * | 2018-07-27 | 2018-12-18 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109787232A (en) * | 2019-03-14 | 2019-05-21 | 山东大学 | The hybrid scattered control system and method based on Model Predictive Control of chain type SVG |
| CN112994431A (en) * | 2021-03-05 | 2021-06-18 | 烟台东方科技环保节能有限公司 | Pre-charging balance control method for power unit of cascade multilevel converter |
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| CN104426346A (en) * | 2013-09-09 | 2015-03-18 | 南京南瑞继保电气有限公司 | Self-excitation soft start method for chain-type converter valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109039041A (en) * | 2018-07-27 | 2018-12-18 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109787232A (en) * | 2019-03-14 | 2019-05-21 | 山东大学 | The hybrid scattered control system and method based on Model Predictive Control of chain type SVG |
| CN112994431A (en) * | 2021-03-05 | 2021-06-18 | 烟台东方科技环保节能有限公司 | Pre-charging balance control method for power unit of cascade multilevel converter |
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| CN107154632B (en) | 2019-11-22 |
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