CN110380441A - The locking of identification extra-high voltage direct-current, the steady control criterion method and apparatus for restarting state - Google Patents
The locking of identification extra-high voltage direct-current, the steady control criterion method and apparatus for restarting state Download PDFInfo
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- CN110380441A CN110380441A CN201910654517.5A CN201910654517A CN110380441A CN 110380441 A CN110380441 A CN 110380441A CN 201910654517 A CN201910654517 A CN 201910654517A CN 110380441 A CN110380441 A CN 110380441A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses the steady control criterion method and apparatus that a kind of identification extra-high voltage direct-current was latched, restarted state, belong to power system automatic field.By calculating the current time of the virtual value of three-phase current, the three-phase current for calculating default resolution ratio and the fundamental phase angle at previous interruption moment；It calculates the change of current and becomes active power and be compared the numerical value being calculated and pre-set value and determine that the corresponding converter valve of change of current change starts, is latched or restarts.Criterion is surely controlled in the standby that the identification extra-high voltage direct-current that the present invention does not depend on direct current control and protection system signal was latched, restarted state, can be accurately identified extra-high voltage direct-current locking and be restarted state, to make up the deficiency of existing stability contorting failure criterion.
Description
Technical field
The invention belongs to power system and automation technologies, are more precisely related to a kind of extra-high straightening of identification
Stream locking, the steady control criterion method and apparatus for restarting state.
Background technique
As large capacity extra-high voltage direct-current gradually puts into operation, power grid " tetanic weak friendship " characteristic is increasingly prominent, and AC-DC coupling is made
With increasingly close, especially high-capacity direct current locking, the malfunction restarted, cause the prompt drop and wave of direct current transmission power
It is dynamic, to sending receiving end AC network to cause extreme shock, threaten the safe and stable operation of extra-high voltage alternating current-direct current interconnected network.
Safety stabilization control system refers to solve the stable problem of a regional power grid and is mounted on two or two
The safety and stability control device of a above plant stand, links together through information channel and Communications Interface Unit and what is formed is
System.Area stability control system is usually by a main website, the safety and stability control device of several substations and several terminal stations
Composition.
Safety and stability control device, by judgement and integrated decision-making, is adopted after preset failure occurs for electric system
Fetch and deliver the strategy of end cutting machine, receiving end cutting load.The existing steady control criterion of direct current locking is sent improper by direct current control and protection system
Based on stoppage in transit signal (ESOF), power, the current status being aided with before and after accident go to judge whether direct current is in locking.
Engineering is being latched the signal that steady control criterion is based on direct current control and protection system with direct current at present, as control and protection system is originally die
Barrier, which does not issue coherent signal, leads to stabilized control system tripping, and in recent years, the defect due to control and protection system repeatedly occurs in extra-high voltage direct-current
Lead to the case of stability control device tripping.
Summary of the invention
Being latched steady control criterion for direct current in the prior art is all the improper stoppage in transit letter sent by direct current control and protection system
Based on number (ESOF), lead to the deficiency of stabilized control system tripping as control and protection system failure itself does not issue coherent signal, the present invention
It is proposed that criterion is surely controlled in a kind of standby that the identification extra-high voltage direct-current for not depending on direct current control and protection system signal was latched, restarted state,
The locking of extra-high voltage direct-current can be accurately identified and restart state, to make up the deficiency of existing stability contorting failure criterion.
The technical solution adopted by the present invention to solve the technical problems is as follows:
On the one hand, the present invention provides a kind of steady control criterion method for identifying extra-high voltage direct-current locking, restarting state, packet
It includes:
Detect three-phase voltage and three-phase current instantaneous value that DC converter becomes net side；
Calculate the virtual value of three-phase current；Calculate the current time and previous interruption moment of the three-phase current of default resolution ratio
Fundamental phase angle；It calculates the change of current and becomes active power；
When detect the change of current become any phase current instantaneous value Sudden Changing Rate Δ I of net side be greater than jump-value of current definite value Δ ISAnd it opens
The realtime power of specific time is greater than the power definite value PS1 that puts into operation before dynamic, or detects that the change of current becomes net side active power variation delta P
Greater than chugging amount definite value Δ PSAnd the realtime power of specific time is greater than the power definite value PS1 that puts into operation before starting, if continuing
Time is more than start-up study tqdThen determine that the change of current becomes corresponding converter valve starting；
After starting, if the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than function after locking
Rate definite value PS2, if detecting, the difference of the three-phase current fundamental phase angle of the specified resolution of continuous two interruptions is all larger than angle
Degree, which disconnects, sets big value DEF δmaxOr respectively less than angle disconnects the small value DEF δ of settingmin, and meet this condition duration and be more than
It is latched short delay definite value td1, then determine that the change of current becomes corresponding change of current valve blocking；
After starting, if detect the change of current become net side three-phase current be less than latching current definite value, and realtime power be less than close
Power definite value PS2 after lock, if detecting, the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions is all larger than
Angle disconnection sets the big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF δ of phase angle differencemin, meet with
The upper condition duration is more than locking long delay setting value td2, determine that the change of current becomes corresponding change of current valve blocking；
After starting, if detect the change of current become net side three-phase current be less than latching current definite value, and realtime power be less than close
Power definite value PS2 after lock, if detecting the current first harmonics phase angle of the specified resolution of continuous two interruptions of three-phase current later
Difference be all larger than angle disconnect setting the big value DEF δ of phase angle differencemaxOr respectively less than angle disconnection setting phase angle difference is small
Value DEF δmin, meeting this condition duration is more than to restart free delay confirmation definite value；Then in locking long delay definite value
td2Within to detect that three-phase current is greater than or equal to latching current definite value and duration be more than to restart free delay confirmation
Definite value then determines that the change of current becomes corresponding converter valve and restarts.
Further, after starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole with
Low side valve is sentenced to be latched out, that is, is judged to monopole locking；Within the starting period of the same setting, 2 poles of rectification side or inverter side
Sentence and be latched out, that is, is judged to extra-high voltage direct-current bipolar locking.
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are equal
Sentence and restart out, is then judged to monopole and restarts；Within the starting period of the same setting, extremely sentences for rectification side 2 and restarts out,
Then it is judged to that extra-high voltage direct-current is bipolar to be restarted.
On the other hand, the present invention provides a kind of steady control criterion device for identifying extra-high voltage direct-current locking, restarting state,
Including sampling module, computing module and determination module:
The sampling module becomes the three-phase voltage and three-phase current instantaneous value of net side for detecting DC converter；
The computing module, for calculate the virtual value of three-phase current, the three-phase current for calculating default resolution ratio it is current
Moment and the previous fundamental phase angle for interrupting the moment；It calculates the change of current and becomes active power；
The determination module, for determining:
When detect the change of current become any phase current instantaneous value Sudden Changing Rate Δ I of net side be greater than jump-value of current definite value Δ ISAnd it opens
The realtime power of specific time is greater than the power definite value PS1 that puts into operation before dynamic, or detects that the change of current becomes net side active power variation delta P
Greater than chugging amount definite value Δ PSAnd the realtime power of specific time is greater than the power definite value PS1 that puts into operation before starting, if continuing
Time is more than start-up study tqdThen determine that the change of current becomes corresponding converter valve starting；
After starting, if the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than function after locking
Rate definite value PS2, if detecting, the difference of the three-phase current fundamental phase angle of the specified resolution of continuous two interruptions is all larger than angle
Degree, which disconnects, sets big value DEF δmaxOr respectively less than angle disconnects the small value DEF δ of settingmin, and meet this condition duration and be more than
It is latched short delay definite value td1, then determine that the change of current becomes corresponding change of current valve blocking；
After starting, if detect the change of current become net side three-phase current be less than latching current definite value, and realtime power be less than close
Power definite value PS2 after lock, if detecting, the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions is all larger than
Angle disconnection sets the big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF δ of phase angle differencemin, meet with
The upper condition duration is more than locking long delay setting value td2, determine that the change of current becomes corresponding change of current valve blocking；
After starting, if detect the change of current become net side three-phase current be less than latching current definite value, and realtime power be less than close
Power definite value PS2 after lock, if detecting the current first harmonics phase angle of the specified resolution of continuous two interruptions of three-phase current later
Difference be all larger than angle disconnect setting the big value DEF δ of phase angle differencemaxOr respectively less than angle disconnection setting phase angle difference is small
Value DEF δmin, meeting this condition duration is more than to restart free delay confirmation definite value；Then in locking long delay definite value
td2Within to detect that three-phase current is greater than or equal to latching current definite value and duration be more than to restart free delay confirmation
Definite value then determines that the change of current becomes corresponding converter valve and restarts.
Compared with prior art, advantageous effects of the invention:
The standby that the identification extra-high voltage direct-current that the present invention does not depend on direct current control and protection system signal was latched, restarted state is surely controlled
Criterion accurately identifies extra-high voltage direct-current locking and restarts state, stability control strategy is correctly executed for stability control device and provides base strip
Part ensures the safe and stable operation of power grid.
Detailed description of the invention
Fig. 1 is the locking of specific embodiment of the invention direct current and restart failure and surely control criterion measurement point schematic diagram.
Fig. 2 is after the present invention does not depend on the identification extra-high voltage direct-current locking of direct current control and protection system signal, restarts state
Standby steady control decision logic block diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
Embodiment 1
It detects DC converter and becomes net side electrical quantity, i.e. measurement point three-phase voltage, three-phase current instantaneous value.It is changed with any
For rheology, device calculates the change of current and becomes net side electricity three-phase current virtual value IA、IB、IC；Three-phase current current time fundamental phase angle
δA、δB、δC, three-phase current previous interruption moment (interrupting sampling with 24 points of cycle to be fixed) fundamental phase angle δAT、δBT、δCT；Three
Phase current (reducing resolution ratio) current time fundamental phase angle S δA、SδB、SδC, when three-phase current (reduce resolution ratio) previous interruption
(sampling is interrupted carve with 24 points of cycle to be fixed) fundamental phase angle S δAT、SδBT、SδCT；It calculates the change of current and becomes active-power P.Specific inspection
The step of surveying failure sees below:
1, device detects that the change of current becomes net side active power variation delta P and is greater than chugging amount definite value Δ PSIt (is set as throwing
Transport power 15%) or the change of current become any phase current variation delta I of net side be greater than jump-value of current definite value Δ ISIt (is set as putting into operation
The 15% of electric current), and power P -0.2 (change of current becomes net side power before 200ms) is greater than the power definite value PS1 that puts into operation before accident, is more than
Start-up study tqd (is set as 5 milliseconds), then sentences device starting.
2, after starting, the change of current becomes rated current (2%I of the net side three-phase current less than 2%N), and realtime power be less than close
Power definite value PS2 after lock；Detect that three-phase current fundamental phase angle subtracts previous interruption moment fundamental phase angle difference later
Absolute value is all larger than DEF δmax(being set as 300) or respectively less than DEF δmin(being set as 80), meeting the conditions above duration is more than to close
Short delay setting value td1 (being set as 50 milliseconds) is locked, that is, determines that the change of current becomes corresponding change of current valve blocking.
3, after starting, the change of current becomes rated current (2%I of the net side three-phase current less than 2%N), and realtime power be less than close
Power definite value PS2 after lock；Detect that three-phase current (reducing resolution ratio) fundamental phase angle subtracts previous interruption moment three-phase later
The absolute value of electric current (reducing resolution ratio) fundamental phase angle difference is all larger than DEF δmax(being set as 300) or respectively less than DEF δminIt (sets
It is more than locking long delay setting value t 80), to meet the conditions above durationd2(being set as 300 milliseconds) determines that the change of current becomes
Corresponding change of current valve blocking.The three-phase current for reducing resolution ratio (is originally sentenced by three-phase current instantaneous sampling value divided by fixed integer
According to take the quotient 5) obtained multiplied by the fixed integer obtain.
4, after starting, the change of current becomes rated current (2%I of the net side three-phase current less than 2%N), and realtime power be less than close
Power definite value PS2 after lock；Detect that three-phase current (reducing resolution ratio) fundamental phase angle subtracts previous interruption moment three-phase later
The absolute value of electric current (reducing resolution ratio) fundamental phase angle difference is all larger than DEF δmax(being set as 300) or respectively less than DEF δminIt (sets
It is more than 5ms 80), to meet the conditions above duration, then in locking long delay setting value td2Within detect three-phase current
Rated current (2%I more than or equal to 2%N) duration is more than 5ms, that is, it is judged to the change of current and becomes corresponding converter valve to restart.
5, after starting, (5s is set as) within the same starting period, the corresponding high end valve of extra-high voltage direct-current monopole and low side
Valve is sentenced to be latched out, that is, is judged to monopole locking；(5s is set as) within the same starting period, and rectification side or inverter side 2 are extremely
Sentence and be latched out, that is, is judged to extra-high voltage direct-current bipolar locking.
6, after starting, (5s is set as) within the same starting period, the corresponding high end valve of extra-high voltage direct-current monopole and low side
Valve is sentenced to be restarted out, that is, is judged to monopole and is restarted；(5s is set as) within the same starting period, and rectification side 2 is extremely sentenced out
Restart, that is, is judged to that extra-high voltage direct-current is bipolar to be restarted.
Embodiment 2:
The steady control criterion device for providing the locking of identification extra-high voltage direct-current in the embodiment of the present invention, restarting state, including
Sampling module, computing module and determination module:
The sampling module becomes the three-phase voltage and three-phase current instantaneous value of net side for detecting DC converter；
The computing module, for calculate the virtual value of three-phase current, the three-phase current for calculating default resolution ratio it is current
Moment and the previous fundamental phase angle for interrupting the moment；It calculates the change of current and becomes active power；
The determination module, for determining:
When detect the change of current become any phase current instantaneous value Sudden Changing Rate Δ I of net side be greater than jump-value of current definite value Δ ISAnd it opens
The realtime power of specific time is greater than the power definite value PS1 that puts into operation before dynamic, or detects that the change of current becomes net side active power variation delta P
Greater than chugging amount definite value Δ PSAnd the realtime power of specific time is greater than the power definite value PS1 that puts into operation before starting, if continuing
Time is more than start-up study tqdThen determine that the change of current becomes corresponding converter valve starting；
After starting, if the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than function after locking
Rate definite value PS2, if detecting, the difference of the three-phase current fundamental phase angle of the specified resolution of continuous two interruptions is greater than angle
It disconnects and sets big value DEF δmaxOr it is less than angle and disconnects the small value DEF δ of settingmin, and meet this condition duration more than locking
Short delay definite value td1, then determine that the change of current becomes corresponding change of current valve blocking；
After starting, if detect the change of current become net side three-phase current be less than latching current definite value, and realtime power be less than close
Power definite value PS2 after lock, if detecting, the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions is greater than angle
Degree disconnects and sets the big value DEF δ of phase angle differencemaxOr it is less than angle and disconnects the setting small value DEF δ of phase angle differencemin, meet this condition
Duration is more than to restart free delay confirmation definite value；Then in locking long delay definite value td2Detect that three-phase current is greater than
Latching current definite value and duration are more than to restart free delay confirmation definite value, then determine that the change of current becomes corresponding converter valve again
Starting.
It further include resolution adjustment module on the basis of above embodiments, the resolution adjustment module is for passing through
Three-phase current instantaneous sampling value obtains the electric current for reducing resolution ratio divided by the quotient that fixed integer obtains multiplied by default fixed integer
Fundamental phase angle.
On the basis of above embodiments, specific embodiment further includes locking polarity and restarts polarity judging module, institute
It states locking polarity and restarts polarity judging module, for determining:
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are equal
Sentence and be latched out, that is, is judged to monopole locking；Within the starting period of the same setting, rectification side or inverter side 2 extremely sentence to be closed out
Lock, that is, be judged to extra-high voltage direct-current bipolar locking；
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are equal
Sentence and restart out, is then judged to monopole and restarts；Within the starting period of the same setting, extremely sentences for rectification side 2 and restarts out,
Then it is judged to that extra-high voltage direct-current is bipolar to be restarted.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. the locking of identification extra-high voltage direct-current, the steady control criterion method for restarting state characterized by comprising
Detect three-phase voltage and three-phase current instantaneous value that DC converter becomes net side；
Calculate the virtual value of three-phase current；Calculate the current time of the three-phase current of default resolution ratio and the base at previous interruption moment
Wave phase angle；It calculates the change of current and becomes active power；
When detect the change of current become any phase current instantaneous value Sudden Changing Rate Δ I of net side be greater than jump-value of current definite value Δ ISAnd before starting
The realtime power of specific time is greater than the power definite value PS1 that puts into operation, or detects that the change of current becomes net side active power variation delta P and is greater than
Chugging amount definite value Δ PSAnd the realtime power of specific time is greater than the power definite value PS1 that puts into operation before starting, if the duration
More than start-up study tqdThen determine that the change of current becomes corresponding converter valve starting；
After starting, if the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is fixed less than power after locking
Value PS2, if detecting later, the difference of the three-phase current fundamental phase angle of the specified resolution of continuous two interruptions is all larger than angle
Degree, which disconnects, sets big value DEF δmaxOr respectively less than angle disconnects the small value DEF δ of settingmin, and meet this condition duration and be more than
It is latched short delay definite value td1, then determine that the change of current becomes corresponding change of current valve blocking；
After starting, if after detecting that the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than locking
Power definite value PS2, if detecting the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions of three-phase current later
Value is all larger than angle and disconnects the setting big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF of phase angle difference
δmin, meeting the conditions above duration is more than locking long delay setting value td2, determine that the change of current becomes corresponding change of current valve blocking；
After starting, if after detecting that the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than locking
Power definite value PS2, if detecting the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions of three-phase current later
Value is all larger than angle and disconnects the setting big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF of phase angle difference
δmin, meeting this condition duration is more than to restart free delay confirmation definite value；Then in locking long delay definite value td2Within
Detect that three-phase current is greater than or equal to latching current definite value and the duration is more than to restart free delay confirmation definite value, then
Determine that the change of current becomes corresponding converter valve and restarts.
2. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In, comprising:
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are sentenced out
Locking is then judged to monopole locking；Within the starting period of the same setting, rectification side or inverter side 2 extremely sentence to be latched out, then
It is judged to extra-high voltage direct-current bipolar locking.
3. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In, comprising:
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are sentenced out
Restart, is then judged to monopole and restarts；Within the starting period of the same setting, extremely sentences for rectification side 2 and restart out, then sentence
Restart for extra-high voltage direct-current is bipolar.
4. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In the chugging amount definite value Δ PSIt is set as putting into operation the 15% of power.
5. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In the jump-value of current definite value Δ ISIt is set as putting into operation the 15% of electric current.
6. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In latching current definite value is set as the 2% of rated current.
7. identification extra-high voltage direct-current locking according to claim 1, the steady control criterion method for restarting state, feature exist
In the quotient obtained by three-phase current instantaneous sampling value divided by fixed integer obtains diminution resolution ratio multiplied by default fixed integer
Current first harmonics phase angle.
8. the locking of identification extra-high voltage direct-current, the steady control criterion device for restarting state, which is characterized in that including sampling module, meter
Calculate module and determination module:
The sampling module becomes the three-phase voltage and three-phase current instantaneous value of net side for detecting DC converter；
The computing module, for calculating the current time of the virtual value of three-phase current, the three-phase current for calculating default resolution ratio
With the previous fundamental phase angle for interrupting the moment；It calculates the change of current and becomes active power；
The determination module, for determining:
When detect the change of current become any phase current instantaneous value Sudden Changing Rate Δ I of net side be greater than jump-value of current definite value Δ ISAnd before starting
The realtime power of specific time is greater than the power definite value PS1 that puts into operation, or detects that the change of current becomes net side active power variation delta P and is greater than
Chugging amount definite value Δ PSAnd the realtime power of specific time is greater than the power definite value PS1 that puts into operation before starting, if the duration
More than start-up study tqdThen determine that the change of current becomes corresponding converter valve starting；
After starting, if the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is fixed less than power after locking
Value PS2, if it is disconnected to detect that the difference of the three-phase current fundamental phase angle of the specified resolution of continuous two interruptions is all larger than angle
Open up surely big value DEF δmaxOr respectively less than angle disconnects the small value DEF δ of settingmin, and meet this condition duration more than locking
Short delay definite value td1, then determine that the change of current becomes corresponding change of current valve blocking；
After starting, if after detecting that the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than locking
Power definite value PS2, if detecting, the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions is all larger than angle
Disconnection sets the big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF δ of phase angle differencemin, meet the above item
The part duration is more than locking long delay setting value td2, determine that the change of current becomes corresponding change of current valve blocking；
After starting, if after detecting that the change of current becomes net side three-phase current and is less than latching current definite value, and realtime power is less than locking
Power definite value PS2, if detecting the difference at the current first harmonics phase angle of the specified resolution of continuous two interruptions of three-phase current later
Value is all larger than angle and disconnects the setting big value DEF δ of phase angle differencemaxOr respectively less than angle disconnects the setting small value DEF of phase angle difference
δmin, meeting this condition duration is more than to restart free delay confirmation definite value；Then in locking long delay definite value td2Within
Detect that three-phase current is greater than or equal to latching current definite value and the duration is more than to restart free delay confirmation definite value, then
Determine that the change of current becomes corresponding converter valve and restarts.
9. identification extra-high voltage direct-current locking according to claim 8, the steady control criterion device for restarting state, feature exist
In, further include resolution adjustment module, the resolution adjustment module be used for by three-phase current instantaneous sampling value divided by fixation
The quotient that integer obtains obtains the current first harmonics phase angle for reducing resolution ratio multiplied by default fixed integer.
10. identification extra-high voltage direct-current locking according to claim 8, the steady control criterion device for restarting state, feature
It is, further includes locking polarity and restart polarity judging module, the locking polarity and restart polarity judging module, is used for
Determine:
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are sentenced out
Locking is judged to monopole locking；Within the starting period of the same setting, rectification side or inverter side 2 extremely sentence to be latched out, i.e.,
It is judged to extra-high voltage direct-current bipolar locking；
After starting, within the starting period of the same setting, the corresponding high end valve of extra-high voltage direct-current monopole and low side valve are sentenced out
Restart, is then judged to monopole and restarts；Within the starting period of the same setting, extremely sentences for rectification side 2 and restart out, then sentence
Restart for extra-high voltage direct-current is bipolar.
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