CN106374505A - STATCOM (Static Synchronous Compensator) chain element unit bypass device and control system - Google Patents
STATCOM (Static Synchronous Compensator) chain element unit bypass device and control system Download PDFInfo
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- CN106374505A CN106374505A CN201510444766.3A CN201510444766A CN106374505A CN 106374505 A CN106374505 A CN 106374505A CN 201510444766 A CN201510444766 A CN 201510444766A CN 106374505 A CN106374505 A CN 106374505A
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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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Abstract
The invention provides a STATCOM (Static Synchronous Compensator) chain element unit bypass device and a control system. The bypass device is arranged in a chain element unit and comprises a circuit breaker with an electric operating mechanism. The input end and the output end of the circuit breaker are respectively connected with two AC ends of an H-bridge circuit of the chain element unit. When the circuit breaker is closed, the chain element unit can be bypassed from the STATCOM. The bypass device is simple in structure, few in components, low in cost, and convenient in mounting, operation and maintenance; the volume of the STATCOM can be reduced; and the power density and the reliability of the chain element unit are improved.
Description
Technical field
The present invention relates to electrical power system dynamic reactive power compensation technique field is and in particular to one kind
Statcom link units shunting device and control system.
Background technology
(stat ic synchronous compensator, Static Synchronous compensate statcom
Device) it is flexible flexible AC transmitting system (facts) in Technology of Dynamic Reactive Power Compensation field
Important component part.Statcom is parallel in electrical network, be equivalent to one controlled idle
Power supply, its reactive current can rapidly be followed the change of reactive load electric current and be changed,
Automatically reactive power needed for compensation network system, realizes dynamic reactive to power system reactive power
Compensate.
Statcom adopts the chain structure of h bridge cascade, that is, include the chain link of multiple cascades
Unit, each link units adopt h bridge topological structure.By the link units breaking down
Bypass can realize the protection to whole statcom chain link, at present, statcom chain link list
First bypass scheme mainly has bypass based on mechanical switch, is based on IGCT inverse parallel adjunction
The bypass of tentaculum, differential concatenation igbt (insulated gate bipolar transistor,
Insulated gate bipolar transistor) bypass several.
Based on the bypass scheme of mechanical switch, it is mainly used in chain link electric pressure at present relatively
In high product, need the mechanical switch of specific customization, be designed as exchange, indoor, single
The structure mutually operating, main inclusion turnover line end (electric conductor), vacuum switch tube, insulation
Support, insulated tension pole, magnetic actuator and controller etc., components selection is difficult,
Device design is complicated, switchs high cost.
Based on the scheme of anti-parallel thyristor adjunction tentaculum, when compensating reactive power exports, chain link
During unit h bridge switch, the altofrequency producing, the pulse voltage of high dv/dt are easily led
IGCT is caused to mislead, poor reliability, also cannot be solved using common rc absorbing circuit
Problem.
Based on the bypass scheme of differential concatenation igbt, when breaking down inside link units,
Block h bridge circuit, opens bypass igbt simultaneously, dash current occurs in the process
And voltage, and ability that igbt withstands shocks weaker it is easy to damage.
Additionally, in above-mentioned statcom link units bypass scheme, link units are other
Lu Hou, once statcom occurs overload or short trouble, shunting device cannot protect chain
Each components and parts in section unit, easily burn components and parts, poor reliability.
Therefore, need a kind of statcom link units bypass scheme badly, to solve above-mentioned skill
Art problem.
Content of the invention
The present invention is directed to above-mentioned deficiency present in prior art, provides a kind of statcom
Link units shunting device and control system, in order to solve existing statcom chain link list
The complex structure of first bypass scheme presence, poor reliability, the problem of high cost.
The present invention is to solve above-mentioned technical problem, adopts the following technical scheme that
The present invention provides a kind of statcom link units shunting device, described shunting device
Be arranged in link units, including the chopper with motor-operating mechanism, chopper defeated
Enter end and outfan exchange end respectively with two of the h bridge circuit of this link units connected；
When breaker closing, can be by this link units from STATCOM
Bypass in statcom.
Preferably, described chopper is multipole circuit breaker.
Preferably, each pole input terminal shortcircuit connection formation one pole of described multipole circuit breaker is defeated
Enter end, each pole output terminal shortcircuit of described multipole circuit breaker connects formation one pole outfan.
The present invention passes through to arrange the chopper with electrically operated institution in statcom link units,
By the input of chopper and outfan two with the h bridge circuit of this link units respectively
Exchange end is connected, by controlling breaker closing, can be by this link units from statcom
Middle bypass, this shunting device structure is simple, and component number is few, accordingly, low cost,
Installation operation and easy to maintenance, and the volume of statcom can be reduced, improve chain link list
The power density of unit；And, chopper has overcurrent protection function, even if in chain link list
Transship after unit's bypass, the fault such as short-circuit or under-voltage, chopper can also disjunction automatically,
The components and parts in link units are avoided to burn, thus improving the reliability of system.
The present invention provides a kind of statcom link units Bypass Control System, including master control
Device processed and three facies units, each facies unit includes the link units of multiple cascade Connections,
Each link units include: control veneer, h bridge circuit and foregoing statcom chain link
Unit bypass device, motor-operating mechanism electrically connects with controlling veneer；
Veneer is controlled to be used for, when judging this link units fault, on master controller
H bridge circuit in report fault type, and this link units of locking；And, receiving
During the bypass instruction that master controller sends, electronic by the chopper in this link units
Operating mechanism, controls this breaker closing；
Master controller is used for, when receiving the fault type that control veneer reports, according to
Described fault type judges whether this fault belongs to and can bypass fault, if belong to bypass event
Barrier, then by the quantity of the link units of bypass current in this facies unit and default threshold value
Compare, if the quantity of the current link units of bypass is less than described threshold in this facies unit
Value, then send bypass instruction to the control veneer reporting fault type.
Preferably, each link units also include the switch electricity that can power for described chopper
Source, Switching Power Supply is electrically connected with the motor-operating mechanism of described chopper.
Further, described chopper is additionally operable to, disconnected to controlling veneer to feed back after combined floodgate
Road device "on" position signal；
Described control veneer is additionally operable to, when the breaker closing shape receiving chopper feedback
During state signal, described breaker closing status signal is sent to master controller；
Described master controller is additionally operable to, when the breaker closing receiving control veneer transmission
During status signal, non-fault link units in the adjustment affiliated facies unit of fault link units
Direct current side unit busbar voltage set-point.
Specifically, described master controller is specifically for by fault link units institute symbolic animal of the birth year list
In unit, the direct current side unit busbar voltage set-point of the link units of each non-fault is adjusted to:
uref=usum/(n-k)；Wherein, n is fault link units affiliated facies unit inner link list
The sum of unit, k is the quantity of the link units of bypass in this facies unit, usumFor direct current
Side unit bus total voltage, urefFor direct current side unit busbar voltage set-point.
Further, described master controller is additionally operable to, and controls veneer to send when receiving
During breaker closing status signal, non-fault in the adjustment affiliated facies unit of fault link units
The phase-shifting carrier wave phase angle of link units.
Specifically, described master controller is specifically for according to following phase-shifting carrier wave phase angle
Sequentially, each non-fault link units in the affiliated facies unit of fault link units are adjusted respectively
Phase-shifting carrier wave phase angle: 0,1 π/(n-k), 2 π/(n-k) ..., (n-k-1)
π/(n-k)；Wherein, n is the total of fault link units affiliated facies unit inner link unit
Number, k is the quantity of the link units of bypass in this facies unit.
Further, described master controller is additionally operable to, and is being judged according to described fault type
Before whether this fault belongs to and can bypass fault, the control of each link units into each facies unit
Veneer processed sends blocking order；And, in the adjustment affiliated facies unit of fault link units
The phase-shifting carrier wave phase angle of non-fault link units and direct current side unit busbar voltage set-point it
Afterwards, send unlock instruction to the control veneer of each link units in each facies unit；
Described control veneer is additionally operable to, and receives the blocking order that master controller sends, and root
According to the h bridge circuit in described blocking order this link units of locking；And, receive master control
The unlock instruction that device processed sends, and h in this link units is unlocked according to described unlock instruction
Bridge circuit.
The present invention passes through fault link units reporting fault type, and master controller is being judged
This fault belongs to can bypass in fault and the affiliated facies unit of fault link units and currently bypasses
Link units when being less than redundancy quantity, send other to the control veneer of fault link units
Road instructs, with the motor-operating mechanism by controlling the chopper in fault link units,
Control this breaker closing, thus realizing the bypass to fault link units.This bypass control
System processed only bypasses and the link units of fault occurs to bypass, can avoid statcom due to
What non-machine halt trouble led to frequently exits, and improves system reliability；Additionally, using a chain
Switching Power Supply in section unit is that the motor-operating mechanism of chopper is powered, and need not additionally connect
Connect external power supply, simplify the cabling layout of power supply, reduces cost.
Brief description
Fig. 1 is the knot of statcom link units shunting device provided in an embodiment of the present invention
Composition；
Fig. 2 is the structural representation of multipole circuit breaker provided in an embodiment of the present invention；
Fig. 3 is the structure of the chopper with motor-operating mechanism provided in an embodiment of the present invention
Schematic diagram；
Fig. 4 is the circuit diagram of motor-operating mechanism provided in an embodiment of the present invention；
Fig. 5 is statcom link units Bypass Control System provided in an embodiment of the present invention
Structural representation；
Fig. 6 is the structural representation of statcom link units provided in an embodiment of the present invention；
Fig. 7 is statcom link units Bypass Control flow process provided in an embodiment of the present invention
Figure.
Specific embodiment
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is carried out clearly
Chu, complete description are it is clear that described embodiment is the part enforcement of the present invention
Example, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other enforcement that technical staff is obtained on the premise of not making creative work
Example, broadly falls into the scope of protection of the invention.
In statcom system, it is limited to the problem of technology it will usually select 3300v
Igbt or 4500v igbt switching device, the quantity of chain link inner link unit is relatively
Few, busbar voltage Balance route is relatively easily realized, but the AC port voltage of chain link will
Ask higher it is impossible to realize bypass using common chopper, so needing using port electricity
Pressure ratio higher, the by-pass switch of customization to be realizing bypass functionality.Using advanced bus
The igbt of 1700v after voltage control technology, can be selected, the quantity of link units has increased
Plus so that the AC port voltage request of chain link reduces, as such, it is possible to from common
Low-voltage circuit breaker is as by-pass switch.
Below in conjunction with Fig. 1-4, to the statcom link units shunting device of the present invention
Structure is described in detail.
As shown in figure 1, statcom link units shunting device includes carrying electric operating machine
The chopper 23 of structure, this shunting device is arranged in link units, the input of chopper 23
End with outfan exchange with two of the h bridge circuit 22 of this link units respectively end ac1 and
Ac2 is connected, when chopper 23 closes a floodgate, can be by this link units from statcom system
Bypass in system.
Chopper 23 includes main contact, can connect open circuit by controlling main contact to close a floodgate
Device circuit, or, cut off breaker circuit by controlling main contact separating brake.Chopper
After 23 close a floodgate, chopper 23 is by h bridge circuit 22 short circuit, thus realizing to this h bridge electricity
Link units bypass belonging to road 22.
This statcom link units shunting device structure is simple, and component number is few, phase
Answer, low cost, installation operation and easy to maintenance, and the body of statcom can be reduced
Long-pending, improve the power density of link units.And, chopper has overcurrent protection function,
Even if after link units bypass, there is overload or short trouble, chopper in statcom
Can disjunction automatically, it is to avoid the components and parts in link units burn, thus improving system
Reliability.
Preferably, chopper 23 can be selected for multipole circuit breaker.
When chopper 23 is multipole circuit breaker it is preferred that can be each by multipole circuit breaker
Pole input terminal shortcircuit connects formation one pole input, and each pole by described multipole circuit breaker
Output terminal shortcircuit connects formation one pole outfan.
Referring to Fig. 2, chopper 23 can be 3 pole choppers, 3 poles of chopper 23
Input q1, q2, q3 pass through the first connecting copper bar short circuit and connect, and form one pole input
Q11,3 pole outfan q4, q5, q6 of chopper pass through the second connecting copper bar short circuit even
Connect, form one pole outfan q12, one pole input q11 and one pole outfan q12 respectively
Exchange end ac1 and ac2 to be connected with two of h bridge circuit 22.
By multipole circuit breaker short circuit being formed the h accessing link units after single-pole circuit breaker
Bridge circuit, can reduce the capacity of chopper, reduces cost.For example, by capacity per electrode
After each pole input of 3 pole choppers for 400a and each pole outfan difference short circuit, can
To form the single-pole circuit breaker of 1200a capacity.
It should be noted that the chopper 23 accessing link units is band motor-operating mechanism
Regular circuit breakers, by control motor-operating mechanism realize electric switch-on, i.e. electronic behaviour
Making mechanism controls main contact to close a floodgate according to control signal.
In the present invention, it is possible to use the control veneer control of master controller and each link units
Make the breaker closing in each link units.
Below in conjunction with Fig. 2, Fig. 3 and Fig. 4, the structure of motor-operted switch is carried out specifically
Bright.
Chopper 23 is the chopper with motor-operating mechanism 232, motor-operating mechanism
232 are mechanically connected with chopper 23.Chopper 23 includes main contact 231 and auxiliary contact
233, auxiliary contact 233 and main contact 231 mechanical linkage.Auxiliary contact 233 action
It is the dry contact signal closing or dividing, can be to control veneer after main contact 231 closes a floodgate
Feedback breaker closing status signal.
Motor-operating mechanism 232 includes power supply and control circuit, and power supply is as stored energy mechanism
Can power for control circuit, control circuit can receive energization control signal and (bypass
Instruction), and control main contact 231 to close a floodgate according to this energization control signal.
The present invention also provides a kind of statcom link units Bypass Control System, below ties
Close Fig. 5, the structure composition of this statcom link units Bypass Control System is carried out in detail
Explanation.
As shown in figure 5, statcom link units Bypass Control System includes: main control
Device 1 and tri- facies units of a, b, c, each facies unit includes multiple link units 2,
Each link units 2 cascade Connection, and be connected by optical fiber with master controller 1.In order to be able to
Enough structures that statcom link units Bypass Control System is clearly described, Fig. 5 is only with a
As a example facies unit, show the company of each link units 2 and master controller 1 in a facies unit
Connect relation, between the link units 2 in b facies unit and c facies unit and master controller 1
Annexation identical with the annexation of master controller 1 with a facies unit, here is no longer
Repeat.
It is preset with threshold value, this threshold value is for each facies unit inner link unit in master controller 1
Big redundancy quantity.It should be noted that the number of a, b, c three phase units inner link unit
Amount is identical, and each facies unit inner link unit maximum redundancy quantity is also identical, only need to be in master control
A threshold value is preset in device 1 processed.Generally, threshold value could be arranged in each facies unit
The 10% about of the total quantity of link units, it may for example comprise the mutually list of 42 link units
Unit, the link units maximum redundancy quantity that it is allowed is 4 that is to say, that this phase
Unit allows up to 4 of the link units of bypass.
In conjunction with shown in Fig. 6, each link units 2 include: control veneer 21, h bridge circuit
22 and statcom link units shunting devices, this statcom link units shunting device
It is chopper 23, the structure of chopper 23 is as it was previously stated, will not be described here.Open circuit
The motor-operating mechanism 232 of device 23 electrically connects with controlling veneer 21.
Veneer 21 is controlled to be used for, when judging this link units 2 fault, to main control
Device 1 reporting fault type, and the h bridge circuit 22 in this link units of locking 2；And,
When receiving the bypass instruction of master controller 1 transmission, by this link units 2
The motor-operating mechanism 232 of chopper 23, controls this chopper 23 to close a floodgate.
Master controller 1 is used for, when receiving the fault type that control veneer 21 reports,
Judge whether this fault belongs to according to described fault type and can bypass fault, if belong to can be other
Road fault, then by the quantity of the link units of bypass current in this facies unit with default
Threshold value compares, if the quantity of the current link units of bypass is less than institute in this facies unit
State threshold value, then send bypass instruction to the control veneer 21 reporting fault type.
Fault can be bypassed include: igbt fault, chain link over-voltage fault, chain link under-voltage fault,
Chain link excess temperature fault.
It should be noted that controlling veneer 21 to judge the judgement of this link units whether fault
Condition belongs to prior art, will not be described here.
As shown in fig. 6, chain link control unit 2 also includes Switching Power Supply 24, Switching Power Supply
24 electrically connect with controlling veneer 21 and h bridge circuit 22 respectively, the mother in h bridge circuit 22
Line capacitance c provides electric energy for Switching Power Supply 24, so that Switching Power Supply 24 is to control veneer
21 power supplies.The input of Switching Power Supply 24 be bus capacitor c positive and negative between high voltage power supply,
Switching Power Supply 24 is output as the low-tension supply of two-way isolation, and a road 15v is to control veneer
21 power supplies, a road 24v powers for motor-operating mechanism 232.
Veneer 21 is controlled to include: bus sampling module 211, control process circuit 212 and
Bypass circuit 213, the direct current that bus sampling module 211 can gather h bridge circuit 22 is female
As control process circuit 212, line voltage, in order to judge whether link units 2 owe
Pressure fault or the basis for estimation of over-voltage fault.Control process circuit 212 can be with main control
Device 1 interacts, and drives h bridge circuit 22 by chain link drive circuit 214.Bypass
Circuit 213 connects mechanical switch, can turn under the control of control process circuit 212,
Thus the bypass instruction (i.e. energization control signal) that master controller 1 is sent be sent to disconnected
The motor-operating mechanism 232 of road device 23.
Preferably, Switching Power Supply 24 and the motor-operating mechanism 232 of chopper 23 are electrically connected
Connect, can power for motor-operating mechanism 232.
Powered using the motor-operating mechanism that the Switching Power Supply in each link units is chopper,
External power supply need not additionally be connected, the cabling layout of power supply, reduces cost can be simplified.
Further, control veneer 21 be additionally operable to, when receive chopper 23 feedback
During breaker closing status signal, described breaker closing status signal is sent to master control
Device 1 processed.
Master controller 1 is additionally operable to, when the breaker closing receiving control veneer 21 transmission
During status signal, non-fault link units in the adjustment affiliated facies unit of fault link units
Direct current side unit busbar voltage set-point.
Specifically, master controller is by non-fault each in affiliated for fault link units facies unit
The direct current side unit busbar voltage set-point of link units is adjusted to: uref=usum/(n-k)；
Wherein, n is the sum of fault link units affiliated facies unit inner link unit, and k is this phase
The quantity of link units of bypass, u in unitsumFor direct current side unit bus total voltage,
urefFor direct current side unit busbar voltage set-point.
Further, master controller 1 is additionally operable to, and controls veneer 21 to send when receiving
During breaker closing status signal, non-fault in the adjustment affiliated facies unit of fault link units
The phase-shifting carrier wave phase angle of link units.
Specifically, master controller 1, according to the order of following phase-shifting carrier wave phase angle, is adjusted respectively
The phase-shifting carrier wave phase angle of each non-fault link units in the affiliated facies unit of whole fault link units:
0,1 π/(n-k), 2 π/(n-k) ..., (n-k-1) π/(n-k)；Its
In, n is the sum of fault link units affiliated facies unit inner link unit, and k is that this is mutually single
The quantity of link units of bypass in unit.
Preferably, master controller 1 is additionally operable to, and is judging this event according to described fault type
Before whether barrier belongs to and can bypass fault, the control list of each link units into each facies unit
Plate sends blocking order；And, not event in the adjustment affiliated facies unit of fault link units
After the phase-shifting carrier wave phase angle of barrier link units and direct current side unit busbar voltage set-point,
Into each facies unit, the control veneer of each link units sends unlock instruction；
Control veneer 21 to be additionally operable to, receive the blocking order that master controller 1 sends, and root
According to the h bridge circuit in described blocking order this link units of locking；And, receive master control
The unlock instruction that device 1 processed sends, and unlocked in this link units according to described unlock instruction
H bridge circuit.
Further, described statcom link units Bypass Control System also includes system
Main circuit breaker (in figure does not illustrate).
Master controller 1 is additionally operable to, when judging that chain link fault does not belong to according to described fault type
In fault can be bypassed, and/or, when the number of the link units of bypass current in this facies unit
When amount is more than or equal to described threshold value, control system main circuit breaker separating brake, to cut off
Statcom and the connection of electrical network.
For clear explanation technical scheme, below in conjunction with Fig. 7, to the present invention
The bypass flow process of the preferred embodiment of statcom link units Bypass Control System carry out
Describe in detail.As shown in fig. 7, this flow process comprises the following steps:
Step 701, when controlling veneer to judge this link units fault, to main control
Device reporting fault type, and h bridge circuit in this link units of locking.
Specifically, when controlling veneer 21 to judge this link units 2 fault, on the one hand
To master controller 1 reporting fault type, so that master controller 1 judges whether to need to bypass
This link units 2.On the other hand, control veneer 21 to the h bridge in this link units 2
The switching tube (igbt) of circuit 22 carries out sealing ripple process, to ensure in h bridge circuit 22
Four igbt stop completely, prevent fault from expanding further.
The fault type of link units includes: igbt fault, chain link over-voltage fault, chain link
Under-voltage fault, chain link excess temperature fault, Switching Power Supply fault and chain link communication failure etc..Control
Veneer 21 processed judges whether this link units occurs the implementation of above-mentioned fault to belong to existing
Technology, will not be described here.
Step 702, master controller sends to the control veneer of each facies unit inner link unit
Blocking order, thus the whole statcom of locking.
Specifically, when master controller 1 receives the control veneer 21 of certain link units 2
During the fault type reporting, into each facies unit, the control veneer of each link units sends and closes
Lock instruction, in order to by the whole link units lockings in a, b, c three phase units.
The locking that veneer 21 receives master controller 1 transmission that controls of each link units 2 refers to
After order, according to the igbt in h bridge circuit in described blocking order this link units of locking.
Step 703, according to described fault type, master controller judges whether this fault belongs to
Fault can be bypassed, if belong to bypass fault, execution step 704, otherwise, execute step
Rapid 711.
Specifically, whether master controller 1 judges to control the fault type that veneer 21 reports to belong to
In fault can be bypassed, if belonging to fault can be bypassed, bypass this fault link units 2, that is,
Execution step 704 and subsequent step；If being not belonging to bypass fault, control system master
Breaker open operation, to cut off the connection of statcom and electrical network, i.e. execution step 711.
Step 704, master controller judges the link units of current bypass in this facies unit
Quantity whether be less than default threshold value, if so, execution step 705, otherwise, execute step
Rapid 710.
If the quantity of the current link units of bypass is more than or equal to threshold in this facies unit
Value, illustrates that each link units in this facies unit current are just being unable to maintain that statcom
Often run, then need to cut off the connection of statcom and electrical network, i.e. execution step 711.As
Really in this facies unit, the quantity of the current link units of bypass is less than this threshold value, and explanation is
After making to bypass this fault link units, remaining link units still can maintain facies unit
Normal run, then allow this fault link units to bypass, i.e. execution step 705 and follow-up
Step.
Step 705, master controller sends bypass to the control veneer reporting fault type and refers to
Order, so that this control veneer controls this breaker closing.
Specifically, if the chain link of current bypass in this facies unit judged by master controller 1
The quantity of unit is less than described threshold value, then send to the control veneer 21 reporting fault type
Bypass instruction.The control process circuit 212 controlling veneer 21 is receiving master controller 1
During the bypass instruction sending, bypass circuit 213 is controlled to turn on, thus passing through bypass circuit
213 send bypass instruction (i.e. energization control signal) to motor-operating mechanism 232, electronic
Operating mechanism 232 controls main contact 231 to close a floodgate according to this energization control signal.
Step 706, controls veneer to receive the breaker closing status signal of chopper feedback,
And described breaker closing status signal is sent to master controller.
Specifically, after the main contact 231 of chopper 23 closes a floodgate, auxiliary contact 233 is to control
Veneer 21 processed feeds back breaker closing status signal, controls veneer 21 disconnected by receive
Road device "on" position signal is sent to master controller 1.
Step 707, non-fault in the master controller adjustment affiliated facies unit of fault link units
The direct current side unit busbar voltage set-point of link units.
If master controller 1 receives the breaker closing status signal controlling veneer 21 to send,
Then illustrate that now this fault link units 2 bypasses, equal in order to realize busbar voltage in phase
Weighing apparatus controls, each non-fault chain in the master controller 1 adjustment affiliated facies unit of fault link units
The direct current side unit busbar voltage set-point of section unit.
Specifically, master controller 1 is by non-fault each in affiliated for fault link units facies unit
The direct current side unit busbar voltage set-point of link units be adjusted to:
uref=usum/(n-k)；Wherein, n is fault link units affiliated facies unit inner link list
The sum of unit, k is the quantity of the link units of bypass in this facies unit, usumFor direct current
Side unit bus total voltage, urefFor direct current side unit busbar voltage set-point.
Step 708, non-fault in the master controller adjustment affiliated facies unit of fault link units
The phase-shifting carrier wave phase angle of link units.
In order to improve busbar voltage control accuracy in a balanced way in phase, master controller 1 further
Non- fault link units in the affiliated facies unit of fault link units can also be adjusted further
Phase-shifting carrier wave phase angle.
Specifically, master controller 1, according to the order of following phase-shifting carrier wave phase angle, is adjusted respectively
The phase-shifting carrier wave phase angle of each non-fault link units in the affiliated facies unit of whole fault link units:
0,1 π/(n-k), 2 π/(n-k) ..., (n-k-1) π/(n-k)；Its
In, n is the sum of fault link units affiliated facies unit inner link unit, and k is that this is mutually single
The quantity of link units of bypass in unit.
It should be noted that the execution sequence of step 9 and step 8 do not limit it is also possible to
Step execution.
Step 709, master controller is sent out to the control veneer of each link units in each facies unit
Send unlock instruction, to unlock whole statcom.
Specifically, in the affiliated facies unit of fault link units in addition to fault link units
The direct current side unit busbar voltage set-point of each link units and phase-shifting carrier wave phase angle have adjusted
After one-tenth, master controller can unlock the link units not bypassed in each facies unit and (solve
Lock whole statcom) so that statcom normally runs.
Step 710, main controller controls system main circuit breaker separating brake, to cut off statcom
Connection with electrical network.
Specifically, if the chain link list of current bypass in this facies unit judged by master controller
The quantity of unit is more than or equal to default threshold value, or, master controller is judged to control list
The fault type that plate reports is not belonging to bypass fault, then control system main circuit breaker separating brake,
To cut off the connection of statcom and electrical network.
The operation principle of system main circuit breaker is the open circuit in work process and each link units
The operation principle of device is identical with work process, will not be described here.
It can thus be seen that the present invention passes through fault link units reporting fault type, main
Controller can bypass fault and fault link units institute symbolic animal of the birth year list judging that this fault belongs to
When in unit, the link units of current bypass are less than redundancy quantity, to fault link units
Veneer is controlled to send bypass instruction, with by controlling the electric operating in fault link units
Mechanism, controls this breaker closing, thus realizing the bypass to fault link units.Should
Bypass Control System only bypasses the link units occurring to bypass fault, can avoid statcom
Because what non-machine halt trouble led to frequently exits, improve system reliability.
It should be noted that fault link units be bypassed after cannot self- recoverage, need handss
The dynamic link units bypass condition information removed in master controller, specifically, can lead
Link units bypass is removed on the foregrounding interface of the backstage of controller or master controller
Status information.
Statcom system goes up electricity again, if fault link units self-inspection is normal, artificial handss
Move after removing link units bypass condition information and reconfiguring link units, statcom
System just can normal operation.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present
And the illustrative embodiments adopting, but the invention is not limited in this.For ability
For those of ordinary skill in domain, in the situation without departing from spirit and substance of the present invention
Under, various modifications and improvement can be made, these modifications and improvement are also considered as the present invention's
Protection domain.
Claims (10)
1. a kind of statcom link units shunting device is it is characterised in that described bypass
Device is arranged in link units, including the chopper with motor-operating mechanism, chopper
Input exchange end phase with two of the h bridge circuit of this link units respectively with outfan
Even；
When breaker closing, can be by this link units from STATCOM
Bypass in statcom.
2. statcom link units shunting device as claimed in claim 1, its feature
It is, described chopper is multipole circuit breaker.
3. statcom link units shunting device as claimed in claim 2, its feature
It is, each pole input terminal shortcircuit of described multipole circuit breaker connects formation one pole input,
Each pole output terminal shortcircuit of described multipole circuit breaker connects formation one pole outfan.
4. a kind of statcom link units Bypass Control System, including master controller and three
Individual facies unit, each facies unit includes the link units of multiple cascade Connections, and its feature exists
In each link units include: control veneer, h bridge circuit and as arbitrary in claim 1-3
Statcom link units shunting device described in, motor-operating mechanism and control veneer
Electrical connection；
Veneer is controlled to be used for, when judging this link units fault, on master controller
H bridge circuit in report fault type, and this link units of locking；And, receiving
During the bypass instruction that master controller sends, electronic by the chopper in this link units
Operating mechanism, controls this breaker closing；
Master controller is used for, when receiving the fault type that control veneer reports, according to
Described fault type judges whether this fault belongs to and can bypass fault, if belong to bypass event
Barrier, then by the quantity of the link units of bypass current in this facies unit and default threshold value
Compare, if the quantity of the current link units of bypass is less than described threshold in this facies unit
Value, then send bypass instruction to the control veneer reporting fault type.
5. statcom link units Bypass Control System as claimed in claim 4, its
It is characterised by, each link units also include the Switching Power Supply that can power for described chopper,
Switching Power Supply is electrically connected with the motor-operating mechanism of described chopper.
6. statcom link units Bypass Control System as claimed in claim 4, its
It is characterised by, described chopper is additionally operable to, to control veneer feedback chopper after combined floodgate
"on" position signal；
Described control veneer is additionally operable to, when the breaker closing shape receiving chopper feedback
During state signal, described breaker closing status signal is sent to master controller；
Described master controller is additionally operable to, when the breaker closing receiving control veneer transmission
During status signal, non-fault link units in the adjustment affiliated facies unit of fault link units
Direct current side unit busbar voltage set-point.
7. statcom link units Bypass Control System as claimed in claim 6, its
It is characterised by, described master controller is specifically for by affiliated for fault link units facies unit
The direct current side unit busbar voltage set-point of the link units of interior each non-fault is adjusted to:
uref=usum/(n-k)；Wherein, n is fault link units affiliated facies unit inner link list
The sum of unit, k is the quantity of the link units of bypass in this facies unit, usumFor direct current
Side unit bus total voltage, urefFor direct current side unit busbar voltage set-point.
8. statcom link units Bypass Control System as claimed in claim 6, its
It is characterised by, described master controller is additionally operable to, when the open circuit receiving control veneer transmission
During device "on" position signal, non-fault chain link in the adjustment affiliated facies unit of fault link units
The phase-shifting carrier wave phase angle of unit.
9. statcom link units Bypass Control System as claimed in claim 8, its
It is characterised by, described master controller is specifically for suitable according to following phase-shifting carrier wave phase angle
Sequence, adjusts the load of each non-fault link units in the affiliated facies unit of fault link units respectively
Ripple phase shift phase angle: 0,1 π/(n-k), 2 π/(n-k) ..., (n-k-1) π/
(n-k)；Wherein, n is the sum of fault link units affiliated facies unit inner link unit,
K is the quantity of the link units of bypass in this facies unit.
10. statcom link units Bypass Control System as claimed in claim 8,
It is characterized in that, described master controller is additionally operable to, and is judging to be somebody's turn to do according to described fault type
Before whether fault belongs to and can bypass fault, the control of each link units into each facies unit
Veneer sends blocking order；And, in the adjustment affiliated facies unit of fault link units not
After the phase-shifting carrier wave phase angle of fault link units and direct current side unit busbar voltage set-point,
Into each facies unit, the control veneer of each link units sends unlock instruction；
Described control veneer is additionally operable to, and receives the blocking order that master controller sends, and root
According to the h bridge circuit in described blocking order this link units of locking；And, receive master control
The unlock instruction that device processed sends, and h in this link units is unlocked according to described unlock instruction
Bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510444766.3A CN106374505A (en) | 2015-07-24 | 2015-07-24 | STATCOM (Static Synchronous Compensator) chain element unit bypass device and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510444766.3A CN106374505A (en) | 2015-07-24 | 2015-07-24 | STATCOM (Static Synchronous Compensator) chain element unit bypass device and control system |
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| Publication Number | Publication Date |
|---|---|
| CN106374505A true CN106374505A (en) | 2017-02-01 |
Family
ID=57881033
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510444766.3A Pending CN106374505A (en) | 2015-07-24 | 2015-07-24 | STATCOM (Static Synchronous Compensator) chain element unit bypass device and control system |
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| CN (1) | CN106374505A (en) |
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| CN106208648A (en) * | 2016-07-19 | 2016-12-07 | 许继集团有限公司 | A kind of STATCOM power model abnormality eliminating method |
| CN107154632A (en) * | 2017-06-22 | 2017-09-12 | 特变电工西安电气科技有限公司 | A kind of recognition methods of power unit by-pass state |
| CN112531708A (en) * | 2020-12-25 | 2021-03-19 | 山东泰开电力电子有限公司 | Bypass system for improving reliability of SVG |
| CN114243725A (en) * | 2021-12-31 | 2022-03-25 | 安徽佑赛科技股份有限公司 | Fault removal system and method for alternating current contactor and SVG |
| CN114336661A (en) * | 2021-12-30 | 2022-04-12 | 安徽佑赛科技股份有限公司 | H-bridge mechanical bypass control circuit, control method and system |
| CN115360725A (en) * | 2022-08-17 | 2022-11-18 | 江苏天合清特电气有限公司 | Method and system for balancing link voltage during locking of SVG device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106208648A (en) * | 2016-07-19 | 2016-12-07 | 许继集团有限公司 | A kind of STATCOM power model abnormality eliminating method |
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| CN112531708A (en) * | 2020-12-25 | 2021-03-19 | 山东泰开电力电子有限公司 | Bypass system for improving reliability of SVG |
| CN114336661A (en) * | 2021-12-30 | 2022-04-12 | 安徽佑赛科技股份有限公司 | H-bridge mechanical bypass control circuit, control method and system |
| CN114243725A (en) * | 2021-12-31 | 2022-03-25 | 安徽佑赛科技股份有限公司 | Fault removal system and method for alternating current contactor and SVG |
| CN115360725A (en) * | 2022-08-17 | 2022-11-18 | 江苏天合清特电气有限公司 | Method and system for balancing link voltage during locking of SVG device |
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