CN108400613A - Generator opens machine process recognition methods with phase modifier during electric system is grid-connected - Google Patents
Generator opens machine process recognition methods with phase modifier during electric system is grid-connected Download PDFInfo
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- CN108400613A CN108400613A CN201810109217.4A CN201810109217A CN108400613A CN 108400613 A CN108400613 A CN 108400613A CN 201810109217 A CN201810109217 A CN 201810109217A CN 108400613 A CN108400613 A CN 108400613A
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- circuit breaker
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a kind of grid-connected generators in the process of electric system to open machine process recognition methods with phase modifier, the normal and abnormal two states of the grid-connected circuit breaker position contact of machine process are opened in comprehensive utilization, when grid-connected circuit breaker position state is normal, using the position of breaker as the main criterion of grid-connected conditions, when circuit breaker position abnormal state, with voltage, frequency, the main criterion of current electrical amount and other auxiliary contact information as grid-connected conditions, using a variety of nodal informations condition is identified as the machine that opens, it is high to open machine recognition accuracy, significantly reduce protection misoperation, the incidence of failure tripping；Support unit sets to be accessed with the grid-connected circuit-breaker status of two-position two ways, and the position for being suitable for a variety of grid-connected breakers is accessed, applied widely, highly practical.
Description
Technical field
The present invention relates to a kind of grid-connected generators in the process of electric system to open machine process recognition methods with phase modifier, belongs to electricity
Force system technical field.
Background technology
Generator/phase modifier, which opens machine mode, diversity, has and realizes what the frequency for opening machine process rose by prime mover, has
Pass through static frequency changer（Static frequency converter, abridge SFC）Machine mistake is opened in injection different frequency electric current realization
What the frequency of journey rose.By static frequency changer open machine mode for, the machine process of opening is divided into the start-up course for sleep mode, same
The pressure reduction of phase failure, quick restarting process etc. again.
Generator/phase modifier start-up course need to develop specific protection, as exploitation open machine differential protection, open machine overcurrent protect
It protects, open the protections such as machine zero sequence overvoltage protection, wrongly energized protection, the protections such as the protection of locking low pressure off-the-line, frequency protection, therefore generate electricity
The recognition methods that machine/phase modifier opens machine process is critically important for the safe operation of generator/phase modifier, power grid.
Current common way is only to open machine process and simultaneously network process by the differentiation of grid-connected circuit-breaker status, and the method is to disconnected
Road device position contact is depended on unduly, when circuit-breaker status contact occurs broken string and bonds, may be caused false protection or be refused
It is dynamic, such as：Point position is mistaken for closing position, opens machine process low pressure off-the-line protection misoperation, opens machine protection and exit entirely, such as meeting of really breaking down
Tripping.
Invention content
It is an object of the invention to overcome deficiency in the prior art, provide a kind of electric system grid-connected generator in the process
Machine process recognition methods is opened with phase modifier, generator in the prior art is solved and phase modifier opens the judgement of machine process and leads to False Rate
Height there is technical issues that protection misoperation, failure.
In order to solve the above technical problems, the technical solution adopted in the present invention is：Generator during electric system is grid-connected
Machine process recognition methods is opened with phase modifier, the recognition methods includes the following steps：
In the case of grid-connected circuit breaker position is normal, when belonging to any one of following three kinds of situations, then generator is judged
It is to open machine process with phase modifier：
When grid-connected breaker only divides the access of position, it is unsatisfactory for that " grid-connected breaker point position is abnormal ", " it is different that grid-connected breaker closes position
Often ", the either condition of " grid-connected circuit breaker position abnormal ", and grid-connected breaker point position position is opened into being 1；
When grid-connected breaker only closes the access of position position, it is unsatisfactory for that " grid-connected breaker point position abnormal ", " it is different that grid-connected breaker closes position
Often ", the either condition of " grid-connected circuit breaker position abnormal ", and grid-connected breaker closes position position and opens into being 0；
When point position position is accessed simultaneously with conjunction position position, it is unsatisfactory for " grid-connected breaker point position is abnormal ", " grid-connected breaker conjunction position
It is abnormal ", the either condition of " grid-connected circuit breaker position is abnormal ", and grid-connected breaker point position position is opened into being 1, close position position open into
It is 0；
The case where for grid-connected circuit breaker position abnormal obliteration, then judges to send out when belonging to any one of following four kinds of situations
Motor is to open machine process with phase modifier：
Generator terminal practical frequency is less than the setpoint frequency value for opening machine process, while meeting the volume that generator terminal maximum phase current is less than 0.5 times
Constant current；
Broken string does not occur for machine potential transformer and generator terminal measurement voltage is less than the setting voltage value for opening machine process, while also full
Sufficient generator terminal maximum phase current is less than 0.5 times of rated current；
When excited work mode is in separate excitation and switches from shunt excitation two ways, the exciting transformer breaker position of separate excitation mode
It sets and is in every knife and close position position；
The generator and phase modifier of machine are opened for being realized using static frequency changer, static frequency changer circuit breaker position and is located every knife
In conjunction position position.
Grid-connected breaker divides the method for discrimination of position exception specific as follows：
When grid-connected breaker only divides a position to access, if grid-connected breaker point position position is opened into being 1, grid-connected circuit breaker current is mutual
Sensor satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal；
When grid-connected breaker only closes the access of position position, opened if grid-connected breaker closes position position into being 0, grid-connected circuit breaker current is mutual
Sensor satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal；
When grid-connected breaker point position position with close position position access simultaneously when, if grid-connected breaker point position position open into for 1 and close
Position position is opened into being 0, and grid-connected circuit breaker electric current transformer satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal.
The method of discrimination that grid-connected breaker closes position exception is specific as follows：
When grid-connected breaker only divides a position to access, if grid-connected breaker point position position is opened into being 0, machine potential transformer is full
It is abnormal to judge that grid-connected breaker closes position for sufficient lower pressure；
When grid-connected breaker only closes the access of position position, opened if grid-connected breaker closes position position into being 1, machine potential transformer is full
It is abnormal to judge that grid-connected breaker closes position for sufficient lower pressure；
When grid-connected breaker point position position with close position position access simultaneously when, if grid-connected breaker point position position open into for 0 and close
Position position is opened into being 1, and machine potential transformer meets lower pressure, that is, it is abnormal to judge that grid-connected breaker closes position.
The method of discrimination of grid-connected circuit breaker position exception is specific as follows：
When grid-connected breaker point position position is accessed simultaneously with conjunction position position, opened if position position is opened into and closed in breaker point position position
When entering while being 0 or being 1 simultaneously, then judge that grid-connected circuit breaker position is abnormal.
Judge that the method for grid-connected circuit breaker position abnormal obliteration is specially：
Meet appointing in " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position is abnormal "
One condition then judges grid-connected circuit breaker position abnormal obliteration.
Judge that the specific method is as follows for set end voltage transformer disconnection：
Residual voltage value or negative sequence voltage are set more than setting residual voltage value when residual voltage is more than, that is, are judged as occurring single
Phase or two-phase voltage circuit breaking；
When three-phase current has been satisfied by stream condition and three-phase voltage is satisfied by no press strip part, that is, it is judged as that three-phase voltage circuit occurs
Broken string.
Compared with prior art, the advantageous effect of the invention reached is：
1, support unit sets accesses with the grid-connected circuit-breaker status of two-position two ways, is suitable for the position of a variety of grid-connected breakers
Access is set, it is applied widely, it is highly practical；
2, the normal and abnormal two states of the grid-connected circuit breaker position contact of machine process, grid-connected circuit breaker position state are opened in comprehensive utilization
When normal, using the position of breaker as the main criterion of condition for opening machine process, when circuit breaker position abnormal state, with voltage,
The main criterion of frequency, current electrical amount and other auxiliary contact information as grid-connected conditions is used as using much information and opens machine
Identification condition, opens that machine recognition accuracy is high, significantly reduces protection misoperation, the incidence of failure tripping.
Description of the drawings
Fig. 1 is that grid-connected breaker divides position anomalous discrimination logic chart；
Fig. 2 is that grid-connected breaker closes position anomalous discrimination logic chart；
Fig. 3 is that grid-connected breaker closes position or jumps position anomalous discrimination logic chart；
Fig. 4 is that grid-connected circuit breaker position abnormal obliteration differentiates logic chart；
Fig. 5 is that generator/phase modifier opens machine process differentiation logic chart when circuit breaker position is normal；
Fig. 6 is that generator terminal frequency differentiates that generator/phase modifier opens machine process logic chart；
Fig. 7 is that set end voltage differentiates that generator/phase modifier opens machine process logic chart；
Fig. 8 is that the exciting transformer position of separate excitation mode differentiates that generator/phase modifier opens machine process logic chart；
Fig. 9 is that static frequency changer position differentiates that generator/phase modifier opens machine process logic chart；
Figure 10 is that generator/phase modifier opens machine process differentiation logic chart.
Specific implementation mode
The present invention provides a kind of grid-connected generator in the process of electric system and opens machine process recognition methods with phase modifier, grid-connected disconnected
When road device location status is normal, using the position of grid-connected breaker as the main criterion of condition for opening machine process, when circuit breaker position shape
When state exception, sentenced using the master of voltage, frequency, current electrical amount and other auxiliary contact information as the conditions for opening machine process
According to, including：Generator terminal frequency is less than setpoint frequency value through delay and generator terminal electric current is less than 0.5 times of rated current, is determined as not grid-connected
Open machine process；Set end voltage is less than setting voltage value through delay and generator terminal electric current is less than 0.5 times of rated current, is determined as not simultaneously
Net opens machine process；The exciting transformer breaker of separate excitation mode is in every knife and closes position state, is judged to not grid-connected opening machine
Process；Static frequency changer (SFC), which opens the SFC breakers of machine mode or is in every knife, closes position state, is judged to not grid-connected opening machine
Process.
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
1) it is based on grid-connected circuit breaker position abnormal state method of discrimination
Grid-connected circuit breaker position can be accessed or be closed position position or point position by point position position and be accessed together with conjunction position position.
Grid-connected breaker point position abnormal logic is as shown in Figure 1, grid-connected breaker divides the logic anomalous discrimination logic of position exception
As described below, grid-connected breaker divides position abnormal logic as shown in Figure 1.When a position only being divided to access, divide the logic discrimination of position exception
It is that a point position position is opened into being 1, grid-connected circuit breaker electric current transformer, which continues for some time t satisfactions, stream condition, that is, is determined as grid-connected
Breaker divides position anomalous discrimination；When only closing the access of position position, the logic discrimination of point position exception is that conjunction position position is opened into being 0, grid-connected
Circuit breaker electric current transformer, which continues for some time t satisfactions, stream condition, that is, is determined as grid-connected breaker point position anomalous discrimination；Divide position
Position with when closing position position and accessing simultaneously, the logic discrimination of point position exception be a point position position open into for 1 and conjunction position position open into for
0, grid-connected circuit breaker electric current transformer, which continues for some time t satisfactions, stream condition, that is, is determined as grid-connected breaker point position and sentences extremely
Not.
The logic anomalous discrimination logic that grid-connected breaker closes position exception is as described below, and grid-connected breaker closes position abnormal logic such as
Shown in Fig. 2.When a position only being divided to access, the logic discrimination for closing position exception is that a point position position is opened into being 0, and it is full to continue for some time t
Sufficient machine potential transformer meets lower pressure, that is, is determined as grid-connected breaker and closes position anomalous discrimination；When only closing the access of position position,
The logic discrimination for closing position exception is that conjunction position position is opened into being 1, continues for some time t and meets machine potential transformer and meets low-pressure section
Part is determined as grid-connected breaker and closes position anomalous discrimination；The logic of position exception is divided in point position position with when closing position position and accessing simultaneously
Differentiation be a point position position open into for 0 and close position position open into being 1, continue for some time t meet machine potential transformer meet it is low
Press strip part is determined as grid-connected breaker and closes position anomalous discrimination.
The logic anomalous discrimination logic of the grid-connected circuit breaker position exception of two-position access is as described below, grid-connected breaker position
It is as shown in Figure 3 to set abnormal logic.Grid-connected breaker point position position with close position position access simultaneously when, when divide position and close position position it is same
When be 0 or be 1 simultaneously, that is, it is 0 to divide position, and it is 0 to be judged as that grid-connected circuit breaker position is abnormal to close position, and when dividing position to be 1, it is 1 to close position
It is judged as that grid-connected circuit breaker position is abnormal.
As shown in figure 4, grid-connected circuit breaker position abnormal obliteration logic is：It is " grid-connected breaker divides position abnormal " or " grid-connected disconnected
It is abnormal that road device closes position " or " grid-connected circuit breaker position is abnormal ".
2) machine process method of discrimination is opened based on generator/phase modifier of grid-connected circuit breaker position state when normal
Grid-connected circuit breaker position state is normal, i.e., the state that grid-connected circuit breaker position abnormal obliteration logic is 0 passes through grid-connected open circuit
Differentiate that generator/phase modifier is in when device point position position is 1 and opens machine process.
As shown in figure 5, generator/phase modifier opens machine process and differentiates that logic is as described below when grid-connected circuit breaker position is normal.
When grid-connected breaker only divides the access of position, be unsatisfactory for " grid-connected breaker point position is abnormal ", " it is abnormal that grid-connected breaker closes position ",
The either condition of " grid-connected circuit breaker position abnormal ", and grid-connected breaker point position position is opened into being 1；Grid-connected breaker only closes position position
When setting access, it is unsatisfactory for that " grid-connected breaker point position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position is different
Either condition often ", and grid-connected breaker closes position position and opens into being 0；Point position position is unsatisfactory for when closing position position and accessing simultaneously
The either condition of " grid-connected breaker divides position abnormal ", " grid-connected breaker conjunction position is abnormal ", " grid-connected circuit breaker position is abnormal ", and
Grid-connected breaker point position position is opened into being 1, is closed position and is opened into being 0.
3) generator/phase modifier when based on grid-connected circuit breaker position abnormal state opens machine process method of discrimination
Grid-connected circuit breaker position abnormal state, i.e., the state that grid-connected circuit breaker position abnormal obliteration logic is 1 pass through generator terminal frequency
Rate, set end voltage, the grid-connected breaker of his exciting transformer and sentence every cutter position, the grid-connected breaker of static frequency changer and every cutter position
Other generator/phase modifier is in and opens machine process.
As shown in fig. 6, when grid-connected circuit breaker position exception generator/phase modifier open machine process differentiate logic it is as described below.
When grid-connected breaker only divides the access of position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " simultaneously
The either condition of net circuit breaker position exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Grid-connected breaker is only
When closing the access of position position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position
The either condition of exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Point position position connects simultaneously with position position is closed
It is fashionable, meet " grid-connected breaker divides position abnormal ", " grid-connected breaker conjunction position exception ", any of " grid-connected circuit breaker position is abnormal "
Condition is to meet " grid-connected circuit breaker position abnormal obliteration " condition.When satisfaction " grid-connected circuit breaker position abnormal obliteration " condition
Meanwhile generator terminal practical frequency is less than the setpoint frequency value for opening machine process, while also meeting generator terminal maximum phase current and being less than 0.5 times
Generator/phase modifier rated current, that is, be judged as generator/phase modifier opens machine process.
As shown in fig. 7, when grid-connected circuit breaker position exception generator/phase modifier open machine process differentiate logic it is as described below.
When grid-connected breaker only divides the access of position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " simultaneously
The either condition of net circuit breaker position exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Grid-connected breaker is only
When closing the access of position position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position
The either condition of exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Point position position connects simultaneously with position position is closed
It is fashionable, meet " grid-connected breaker divides position abnormal ", " grid-connected breaker conjunction position exception ", any of " grid-connected circuit breaker position is abnormal "
Condition is to meet " grid-connected circuit breaker position abnormal obliteration " condition.When satisfaction " grid-connected circuit breaker position abnormal obliteration " condition
Meanwhile broken string and generator terminal measurement voltage do not occur for machine potential transformer（Phase voltage may be selected, line voltage also may be selected）It is small
In opening the setting voltage value of machine process, while also meeting the specified electricity of generator/phase modifier that generator terminal maximum phase current is less than 0.5 times
Stream, that is, be judged as generator/phase modifier opens machine process.The criterion of machine potential transformer broken string, when residual voltage is big
It is more than setting residual voltage value in setting residual voltage value or negative sequence voltage, that is, is judged as that single-phase or two-phase voltage circuit occurs
Broken string is judged as that three-phase electricity, which occurs, to be pushed back when three-phase current has been satisfied by stream condition and three-phase voltage is satisfied by no press strip part
Break on road.
As shown in figure 8, when grid-connected circuit breaker position exception generator/phase modifier open machine process differentiate logic it is as described below.
When grid-connected breaker only divides the access of position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " simultaneously
The either condition of net circuit breaker position exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Grid-connected breaker is only
When closing the access of position position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position
The either condition of exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Point position position connects simultaneously with position position is closed
It is fashionable, meet " grid-connected breaker divides position abnormal ", " grid-connected breaker conjunction position exception ", any of " grid-connected circuit breaker position is abnormal "
Condition is to meet " grid-connected circuit breaker position abnormal obliteration " condition.When excited work mode is in separate excitation and from two kinds of sides of shunt excitation
When formula switches, opens machine process and be in separate excitation working method certainly, therefore can be by judging that current state is in encouraging for separate excitation mode
Magnetic transformer also can determine whether out whether be in generator/phase modifier still from the working method of the exciting transformer of shunt excitation mode
Open machine process.Therefore when meet " grid-connected circuit breaker position abnormal obliteration " condition while, excited work mode be in separate excitation with
Separate excitation working method from two kinds of excitation presentation modes of shunt excitation, i.e. the grid-connected circuit breaker position of exciting transformer of separate excitation mode and
When knife is in and closes position position, be judged as generator/phase modifier opens machine process.
As shown in figure 9, when grid-connected circuit breaker position exception generator/phase modifier open machine process differentiate logic it is as described below.
When grid-connected breaker only divides the access of position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " simultaneously
The either condition of net circuit breaker position exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Grid-connected breaker is only
When closing the access of position position, meet " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position
The either condition of exception " is to meet " grid-connected circuit breaker position abnormal obliteration " condition；Point position position connects simultaneously with position position is closed
It is fashionable, meet " grid-connected breaker divides position abnormal ", " grid-connected breaker conjunction position exception ", any of " grid-connected circuit breaker position is abnormal "
Condition is to meet " grid-connected circuit breaker position abnormal obliteration " condition.When passing through static frequency changer（SFC）Realize the power generation for the machine that opens
Machine/phase modifier can discriminate whether the Qi Jifang in generator/phase modifier by the way that whether static frequency changer is in running order
Formula.Therefore while " the grid-connected circuit breaker position abnormal obliteration " condition of satisfaction, static frequency changer is in input state, i.e., static
The grid-connected circuit breaker position of frequency converter and every knife be in close position position when, be judged as generator/phase modifier opens machine process.
As shown in Figure 10, generator/phase modifier open machine process differentiate logic be meet Fig. 6 generator terminal frequencies differentiate generator/
Phase modifier opens machine process logic, Fig. 7 set end voltages differentiate that generator/phase modifier opens machine process logic, the excitation of Fig. 8 separate excitation modes
Position resolver differentiates that generator/phase modifier opens machine process logic, Fig. 9 static frequency changers position differentiates that generator/phase modifier opens
The either condition of machine process logic.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. generator opens machine process recognition methods with phase modifier during electric system is grid-connected, which is characterized in that the identification side
Method includes the following steps：
In the case of grid-connected circuit breaker position is normal, when belonging to any one of following three kinds of situations, then generator is judged
It is to open machine process with phase modifier：
When grid-connected breaker only divides the access of position, it is unsatisfactory for that " grid-connected breaker point position is abnormal ", " it is different that grid-connected breaker closes position
Often ", the either condition of " grid-connected circuit breaker position abnormal ", and grid-connected breaker point position position is opened into being 1；
When grid-connected breaker only closes the access of position position, it is unsatisfactory for that " grid-connected breaker point position abnormal ", " it is different that grid-connected breaker closes position
Often ", the either condition of " grid-connected circuit breaker position abnormal ", and grid-connected breaker closes position position and opens into being 0；
When point position position is accessed simultaneously with conjunction position position, it is unsatisfactory for " grid-connected breaker point position is abnormal ", " grid-connected breaker conjunction position
It is abnormal ", the either condition of " grid-connected circuit breaker position is abnormal ", and grid-connected breaker point position position is opened into being 1, close position position open into
It is 0；
The case where for grid-connected circuit breaker position abnormal obliteration, then judges to send out when belonging to any one of following four kinds of situations
Motor is to open machine process with phase modifier：
Generator terminal practical frequency is less than the setpoint frequency value for opening machine process, while meeting the volume that generator terminal maximum phase current is less than 0.5 times
Constant current；
Broken string does not occur for machine potential transformer and generator terminal measurement voltage is less than the setting voltage value for opening machine process, while also full
Sufficient generator terminal maximum phase current is less than 0.5 times of rated current；
When excited work mode is in separate excitation and switches from shunt excitation two ways, the exciting transformer breaker position of separate excitation mode
It sets and is in every knife and close position position；
The generator and phase modifier of machine are opened for being realized using static frequency changer, static frequency changer circuit breaker position and is located every knife
In conjunction position position.
Generator opens machine process recognition methods with phase modifier during 2. electric system according to claim 1 is grid-connected,
It is characterized in that, grid-connected breaker divides the method for discrimination of position exception specific as follows：
When grid-connected breaker only divides a position to access, if grid-connected breaker point position position is opened into being 1, grid-connected circuit breaker current is mutual
Sensor satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal；
When grid-connected breaker only closes the access of position position, opened if grid-connected breaker closes position position into being 0, grid-connected circuit breaker current is mutual
Sensor satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal；
When grid-connected breaker point position position with close position position access simultaneously when, if grid-connected breaker point position position open into for 1 and close
Position position is opened into being 0, and grid-connected circuit breaker electric current transformer satisfaction has stream condition, that is, judges that grid-connected breaker point position is abnormal.
Generator opens machine process recognition methods with phase modifier during 3. electric system according to claim 1 is grid-connected,
It is characterized in that, the method for discrimination that grid-connected breaker closes position exception is specific as follows：
When grid-connected breaker only divides a position to access, if grid-connected breaker point position position is opened into being 0, machine potential transformer is full
It is abnormal to judge that grid-connected breaker closes position for sufficient lower pressure；
When grid-connected breaker only closes the access of position position, opened if grid-connected breaker closes position position into being 1, machine potential transformer is full
It is abnormal to judge that grid-connected breaker closes position for sufficient lower pressure；
When grid-connected breaker point position position with close position position access simultaneously when, if grid-connected breaker point position position open into for 0 and close
Position position is opened into being 1, and machine potential transformer meets lower pressure, that is, it is abnormal to judge that grid-connected breaker closes position.
Generator opens machine process recognition methods with phase modifier during 4. electric system according to claim 1 is grid-connected,
It is characterized in that, the method for discrimination of grid-connected circuit breaker position exception is specific as follows：
When grid-connected breaker point position position is accessed simultaneously with conjunction position position, opened if position position is opened into and closed in breaker point position position
When entering while being 0 or being 1 simultaneously, then judge that grid-connected circuit breaker position is abnormal.
5. generator opens machine process with phase modifier during electric system according to any one of claim 1 to 4 is grid-connected
Recognition methods, which is characterized in that judge that the method for grid-connected circuit breaker position abnormal obliteration is specially：
Meet appointing in " grid-connected breaker divides position abnormal ", " it is abnormal that grid-connected breaker closes position ", " grid-connected circuit breaker position is abnormal "
One condition then judges grid-connected circuit breaker position abnormal obliteration.
Generator opens machine process recognition methods with phase modifier during 6. electric system according to claim 1 is grid-connected,
It is characterized in that, the specific method is as follows for judgement set end voltage transformer disconnection：
Residual voltage value or negative sequence voltage are set more than setting residual voltage value when residual voltage is more than, that is, are judged as occurring single
Phase or two-phase voltage circuit breaking；
When three-phase current has been satisfied by stream condition and three-phase voltage is satisfied by no press strip part, that is, it is judged as that three-phase voltage circuit occurs
Broken string.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109038684A (en) * | 2018-08-15 | 2018-12-18 | 国电南瑞科技股份有限公司 | A kind of large synchronous compensator group running down simultaneous interconnecting method |
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| CN109038684B (en) * | 2018-08-15 | 2021-10-01 | 国电南瑞科技股份有限公司 | Lazy-run synchronous grid-connection method for large synchronous phase modulation unit |
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| CN108400613B (en) | 2021-07-02 |
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