CN103986137B - Novel self fault recovery system of multifunctional current limiter and control method of novel self fault recovery system - Google Patents
Novel self fault recovery system of multifunctional current limiter and control method of novel self fault recovery system Download PDFInfo
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Abstract
The invention discloses a novel self fault recovery system of a multifunctional current limiter and a control method of the novel self fault recovery system. The recovery system is mainly composed of a standby bridge arm 1, a standby bridge arm 2, self fault set selection switches K[w], self fault set selection switches K[n] and by-pass switches. The standby bridge arm 1 is connected with three bridge arms of a PWM rectifier through the self fault set selection switch K[w1], the self fault set selection switch K[w2] and the self fault set selection switch K[w3] of the self fault set selection switches K[w] and the standby arm 2 is connected with the three bridge arms of the PWM rectifier through the self fault set selection switch K[w4], the self fault set selection switch K[w5] and the self fault set selection switch K[w6] of the self fault set selection switches K[w] so that rapid recovery of faults of less than two bridge arms of the PWM rectifier can be achieved. The standby bridge arm 2 is connected with four bridge arms of a PWM inverter through the self fault set selection switch K[n1], the self fault set selection switch K[n2], the self fault set selection switch K[n3] and the self fault set selection switch K[n4] of the self fault set selection switches K[n] and the standby bridge arm 1 is connected with the four bridge arms of the PWM inverter through the self fault set selection switch K[n5], the self fault set selection switch K[n6], the self fault set selection switch K[n7] and the self fault set selection switch K[n8] of the self fault set selection switches K[n] so that rapid recovery of faults of less than two bridge arms of the PWM inverter can be achieved. The by-pass switch K[1], the by-pass switch K[2] and the by-pass switch K[3] are connected to one side of a series transformer T[1], one side of a series transformer T[2] and one side of a series transformer T[3] respectively. When the by-pass switches are switched on, the conditions that the system is usable without standby bridge arms and continuous power supply of the system is achieved when thyristor disconnection of a thyristor branch circuit occurs are guaranteed.
Description
Technical field
The invention belongs to applied power electronics technical field, is related to a kind of the new from fault recovery system of Multifunctional current limiter
System and its control method.
Background technology
The basic demand of Operation of Electric Systems is safe and reliable, the quality of power supply is high, good economy performance.But with light in recent years
The fast development of volt industry distributed power supply and power electronics type load device gradually increase, and cause the electricity in power system
Energy quality problems are more highlighted, while be limited to the periodic power characteristic of the power supplys such as photovoltaic generation, small power station affect, system
Voltage pulsation change also gradually increases.On the other hand with the great-leap-forward development of bulk power grid, the continuous increase of power system capacity, make
It is increasing into capacity of short circuit, once the harm that short trouble occurs thus to cause will diffuse into electrical network itself and load.It is many
Functional fault current limiter is that be taken seriously all the more in recent years a kind of possesses power quality compensation and failure current limit dual-use function
New electric energy quality controller, because its utilization ratio is high, powerful, current limitation effect starts to be paid attention to by industry well.But
It is that Multifunctional current limiter is series connection access system, the electric current for flowing through current limiter is identical with load current, once current limiter itself is sent out
Thus raw failure, it will force load power-off, continuous capability degradation of powering is necessary the event certainly for proposing Multifunctional current limiter
Barrier recovery system.
The content of the invention
The invention provides a kind of Multifunctional current limiter is new from fault recovery system and its control method, can be in many work(
Can realize from fault recovery in time in the case of current limiter itself fail, working condition is restored within the shortest time.
The present invention is achieved by the following technical solution.
A kind of Multifunctional current limiter it is new from fault recovery system, by standby bridge arm 1, standby bridge arm 2, from the choosing of failure group
Select switch Kw, from failure group selection switch KnWith by-pass switch composition；Wherein:By-pass switch is connected in parallel on series transformer primary side；
Standby bridge arm 1 from failure group selection by switching KwKw1、Kw2、Kw3Three bridge arms of PWM rectifier are connected to,
K is switched by group selectionnKn5、Kn6、Kn7、Kn8Four bridge arms of connection PWM inverter；
Standby bridge arm 2 switchs K by group selectionwKw4、Kw5And Kw6The three-phase bridge arm of connection PWM rectifier, by a group choosing
Select switch KnKn1、Kn2、Kn3、Kn4Four bridge arms of connection PWM inverter；Two groups of standby bridge arms are connected to respectively PWM rectifications
Between device and PWM inverter.
A kind of the new of described Multifunctional current limiter is that two groups of standby bridge arms are in work from fault recovery system control method
Access system can be switched by group selection when making bridge arm switching device failure, including PWM rectification modules bridge arm is from fault recovery control
System and the control of PWM inversion module bridge arm failures self- recoverage, its concrete control method is as follows：
1.PWM rectification modules bridge arm from failure when standby bridge arm input control：
The first step, detects the bridge arm working signal of PWM rectification modules, and according to working signal bridge arm event is judged whether
Barrier, and the sequence number of failure judgement bridge arm；
Second step, if bridge arm has failure, by all PWM inversion modules compensating instruction zero setting, maintains multi-functional current limliting
Device is each output as zero, keeps load to power normally；
3rd step, judges whether still there is available standby bridge arm, if not standby according to the working signal of standby bridge arm
Bridge arm, then send alarm from fault recovery system；If still there is available standby bridge arm, according to the sequence number of failure bridge arm,
Corresponding group selection switch is closed, physical replacement failure bridge arm is realized；
4th step, the control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes control
System substitutes failure bridge arm；
5th step, after standby bridge arm realizes that physical replacement and control are substituted, recovers the thermal compensation signal of PWM inversion modules, limit
Stream device recovers normal；
6th step, waits and changes failure bridge arm, uses as new standby bridge arm.
2.PWM inversion modules bridge arm from failure when standby bridge arm input control, with PWM rectification modules bridge arm from failure when it is standby
It is similar to the step of bridge arm input control：
The first step, the new bridge arm working signal that PWM inversion modules are detected from fault recovery system of Multifunctional current limiter,
Bridge arm failure, and the sequence number of failure judgement bridge arm are judged whether according to working signal；
Second step, if bridge arm has failure, by failure phase PWM inversion module compensating instruction zero setting, other phase PWM inversions
Module normal work；
3rd step, judges whether still there is available standby bridge arm, if not standby according to the working signal of standby bridge arm
Bridge arm, then send alarm from fault recovery system, then closes failure phase by-pass switch；If still there is available emergency bridge
Arm, then according to the sequence number of failure bridge arm, close corresponding group selection switch, realizes physical replacement failure bridge arm；
4th step, the control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes control
System substitutes failure bridge arm；
5th step, after standby bridge arm realizes that physical replacement and control are substituted, recovers the compensation letter of failure phase PWM inversion module
Number, current limiter recovers normal；
6th step, waits and changes failure bridge arm, uses as new standby bridge arm.
The system and its control method beneficial effect of the present invention is, by detection in PWM rectifier and PWM inverter bridge arm
Working signal carry out bridge arm breakdown judge, the corresponding group selection that control is connected with failure bridge arm switch close emergency bridge is quick
In putting into current limiter, realize that physical placement is recovered current limiter after replacing with control.Can reduce to the full extent
By impact of the failure of current limiter to electrical network and load itself, the continuous operation of current limiter is realized, reduction is made by current limiter failure
Into power supply continuation decline, the less economic loss for causing.
Description of the drawings
Fig. 1 is the new from fault recovery system topological structure of Multifunctional current limiter；
Fig. 2 is the new from fault recovery control flow chart of Multifunctional current limiter.
Specific embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the new from fault recovery system topological structure of Multifunctional current limiter proposed by the present invention.PWM rectifier,
PWM inverter, IGCT branch road, bypass branch constitute Multifunctional current limiter.A kind of Multifunctional current limiter it is new from failure
Recovery system mainly switchs K by standby bridge arm 1, standby bridge arm 2, from failure group selectionw, from failure group selection switch KnAnd bypass
Switch composition, wherein standby bridge arm 1 from failure group selection by switching KwKw1、Kw2、Kw3It is connected to three of PWM rectifier
Bridge arm, standby bridge arm 2 passes through KwKw4、Kw5And Kw6The three-phase bridge arm of connection PWM rectifier, can realize PWM rectifier two
The fast quick-recovery of following bridge arm failure, standby bridge arm 2 from failure group selection by switching KnKn1、Kn2、Kn3、Kn4PWM is inverse for connection
Become four bridge arms of device, standby bridge arm 1 passes through KnKn5、Kn6、Kn7、Kn8Four bridge arms of connection PWM inverter, can realize PWM
The fast quick-recovery of bridge arm failure, by-pass switch K below inverter two1、K2And K3It is connected to series transformer T1、T2And T3
Primary side.By-pass switch K1、K2And K3It is connected to series transformer T1、T2And T3Primary side, can there are currently no in fact standby
Continue to make system power supply with Multifunctional current limiter is cut off during bridge arm, improve the continued power ability of electrical network.
Fig. 2 is new from fault recovery system control process figure for Multifunctional current limiter, leads to after current limiter breaks down
Cross control standby bridge arm to be put in current limiter, realize that current limiter itself, from the recovery under failure, completes physical placement and control
System is replaced, and its concrete control process includes two aspects：
1PWM rectification modules bridge arm from failure when standby bridge arm input control：
1.1) the new bridge arm working signal that PWM rectification modules are detected from fault recovery system of Multifunctional current limiter, root
Bridge arm failure, and the sequence number of failure judgement bridge arm are judged whether according to working signal；
If 1.2) bridge arm has failure, by all PWM inversion modules compensating instruction zero setting, maintain Multifunctional current limiter each
From being output as zero, load is kept to power normally；
1.3) judge whether still there is available standby bridge arm according to the working signal of standby bridge arm, if without emergency bridge
Arm, then send alarm from fault recovery system；If still there is available standby bridge arm, according to the sequence number of failure bridge arm, close
Corresponding group selection switch is closed, physical replacement failure bridge arm is realized；
1.4) control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes that control is replaced
For failure bridge arm；
1.5) after standby bridge arm realizes that physical replacement and control are substituted, the thermal compensation signal of PWM inversion modules, current limiter are recovered
Recover normal；
1.6) wait and change failure bridge arm, use as new standby bridge arm.
2PWM inversion modules bridge arm from failure when standby bridge arm input control：
2.1) the new bridge arm working signal that PWM inversion modules are detected from fault recovery system of Multifunctional current limiter, root
Bridge arm failure, and the sequence number of failure judgement bridge arm are judged whether according to working signal；
If 2.2) bridge arm has failure, by failure phase PWM inversion module compensating instruction zero setting, other phase PWM inversion moulds
Block normal work；
2.3) judge whether still there is available standby bridge arm according to the working signal of standby bridge arm, if without emergency bridge
Arm, then send alarm from fault recovery system, then closes failure phase by-pass switch；If still there is available standby bridge arm,
Then according to the sequence number of failure bridge arm, corresponding group selection switch is closed, realize physical replacement failure bridge arm；
2.4) control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes that control is replaced
For failure bridge arm；
2.5) after standby bridge arm realizes that physical replacement and control are substituted, the thermal compensation signal of failure phase PWM inversion module is recovered,
Current limiter recovers normal；
2.6) wait and change failure bridge arm, use as new standby bridge arm.
Claims (1)
1. a kind of Multifunctional current limiter is new from fault recovery system, by standby bridge arm 1, standby bridge arm 2, from failure group selection
Switch Kw, from failure group selection switch KnWith by-pass switch composition；Wherein:
By-pass switch is connected in parallel on series transformer primary side；
Standby bridge arm 1 from failure group selection by switching KwKw1、Kw2、Kw3Three bridge arms of PWM rectifier are connected to, by certainly
Failure group selection switchs KnKn5、Kn6、Kn7、Kn8Four bridge arms of connection PWM inverter；
Standby bridge arm 2 from failure group selection by switching KwKw4、Kw5And Kw6The three-phase bridge arm of connection PWM rectifier, by certainly
Failure group selection switchs KnKn1、Kn2、Kn3、Kn4Four bridge arms of connection PWM inverter；
Two groups of standby bridge arms are connected to respectively between PWM rectifier and PWM inverter；
Using a kind of the new from fault recovery system of the above-mentioned Multifunctional current limiter for referring to：Two groups of standby bridge arms are in work bridge arm
Can be by switching access system from failure group selection during switching device failure, including PWM rectification modules bridge arm is from fault recovery control
System and the control of PWM inversion module bridge arm failures self- recoverage, above two is as follows respectively from the control method of fault recovery：
2.1PWM rectification modules bridge arm from failure when standby bridge arm input control：
2.1.1) the new bridge arm working signal that PWM rectification modules are detected from fault recovery system of Multifunctional current limiter, according to
Working signal judges whether bridge arm failure, and the sequence number of failure judgement bridge arm；
2.1.2) if bridge arm has failure, by all PWM inversion modules compensating instruction zero setting, Multifunctional current limiter is maintained each
Zero is output as, keeps load to power normally；
2.1.3) judge whether still there is available standby bridge arm according to the working signal of standby bridge arm, if without standby bridge arm,
Then send alarm from fault recovery system；If still there is available standby bridge arm, according to the sequence number of failure bridge arm, closed pair
That what is answered switchs from failure group selection, realizes physical replacement failure bridge arm；
2.1.4) control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes that control is substituted
Failure bridge arm；
2.1.5 after) standby bridge arm realizes that physical replacement and control are substituted, the thermal compensation signal of PWM inversion modules is recovered, current limiter is extensive
It is multiple normal；
2.1.6) wait and change failure bridge arm, use as new standby bridge arm；
2.2PWM inversion modules bridge arm from failure when standby bridge arm input control：
2.2.1) the new bridge arm working signal that PWM inversion modules are detected from fault recovery system of Multifunctional current limiter, according to
Working signal judges whether bridge arm failure, and the sequence number of failure judgement bridge arm；
2.2.2) if bridge arm has failure, by failure phase PWM inversion module compensating instruction zero setting, other phase PWM inversion modules
Normal work；
2.2.3) judge whether still there is available standby bridge arm according to the working signal of standby bridge arm, if without standby bridge arm,
Then alarm is sent from fault recovery system, then close failure phase by-pass switch；If still there is available standby bridge arm, according to
According to the sequence number of failure bridge arm, closure is corresponding from failure group selection switch, realizes physical replacement failure bridge arm；
2.2.4) control signal of failure bridge arm is assigned to the standby bridge arm of new input from fault recovery system, realizes that control is substituted
Failure bridge arm；
2.2.5 after) standby bridge arm realizes that physical replacement and control are substituted, the thermal compensation signal of failure phase PWM inversion module, limit are recovered
Stream device recovers normal；
2.2.6) wait and change failure bridge arm, use as new standby bridge arm.
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| JP6606012B2 (en) * | 2016-05-18 | 2019-11-13 | 株式会社日立製作所 | Power conversion device and elevator device using the same |
| CN107634661A (en) * | 2017-10-24 | 2018-01-26 | 北京精密机电控制设备研究所 | A kind of multi-channel DC out-put supply |
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| CN203434917U (en) * | 2013-07-17 | 2014-02-12 | 江苏大学 | Motor fault tolerance driving control system capable of automatic fault repairing |
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| 多功能固态限流器的现状及展望;涂春鸣等;《中国电工技术学会学术年会——新能源发电技术论坛论文集》;20131031;91-98 * |
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