CN109149920A - The starting charging method of flexible island direct current transmission system island converter station - Google Patents
The starting charging method of flexible island direct current transmission system island converter station Download PDFInfo
- Publication number
- CN109149920A CN109149920A CN201811185220.0A CN201811185220A CN109149920A CN 109149920 A CN109149920 A CN 109149920A CN 201811185220 A CN201811185220 A CN 201811185220A CN 109149920 A CN109149920 A CN 109149920A
- Authority
- CN
- China
- Prior art keywords
- converter station
- submodule
- bridge arm
- island
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of starting charging methods of flexible island direct current transmission system island converter station, including converter station to be in starting charging preparation state；Converter station starting charging enters uncontrollable charged state；The charge parameter that converter station detects each bridge arm terminates the uncontrollable charged state of converter station in due course；Converter station starts the active charge strategy with damping control and enters active charged state；Converter station detects the charge parameter of each bridge arm and terminates the active charge state of converter station in due course, to complete the starting charging of converter station.The present invention passes through the calculating and addition of compensating module, realize the starting charging process of flexible island direct current transmission system island converter station it is smooth, without impact and dead-beat, and start-up course does not need the cooperation of other converter stations, suitable for isolated island converter station, and start-up course is safe and reliable, on other converter stations without influence；In addition, the method for the present invention is simple and reliable, it is easy to Project Realization.
Description
Technical field
Present invention relates particularly to a kind of starting charging methods of flexible island direct current transmission system island converter station.
Background technique
Flexible direct current based on modularization multi-level converter (modular multilevel converter, MMC) is defeated
Power technology (high voltage direct current, HVDC) is using the insulated gate bipolar with self-switching-off capability
Transistor (Insulate-Gate Bipolar Transistor, IGBT) is used as semiconductor power switch device.Due to IGBT
Full control performance, flexible direct current converter station can be provided for passive network alternating voltage support, especially suitable for marine wind electric field
Access.The normal operation of flexible direct current converter station needs submodule capacitor as support, and the foundation of submodule capacitor voltage is then
It is the premise that converter station operates normally.The low pressure of the devices such as the driving plate of semiconductor supply device and control board in soft straight converter station
DC power supply takes as submodule capacitor voltage, and only submodule capacitor, which establishes sufficiently large voltage and could effectively drive, partly leads
Body device is switched on or off, therefore the starting charging of soft straight converter station is then that engineering operation primarily solves the problems, such as.
Under charging situation of encouraging oneself, the AC network property that the starting charging modes of soft straight converter station are connect with it has very
Big relationship, if converter station connection is active power grid, which by the charging of exchange side or can both pass through
DC side charging；If converter station connection is passive network, which can only be charged by DC side.It is connected with
The converter station of source power grid can not influence the converter station to put into operation, not need other in the case where being charged using exchange side
The cooperation of converter station can also complete charging process, be relatively specific for the flexible HVDC transmission system of any end number.In view of soft straight
The starting charging process of converter station cannot influence other converter stations to have put into operation and cannot trigger any protection of whole system
Therefore movement is relatively specific for both ends flexible HVDC transmission system by the converter station that DC side charges, but for multiterminal and
It needs to take certain measure that could be applicable in for DC grid.
Being matched based on modularization multi-level converter and its starter for currently used soft straight converter station as shown in Figure 1
Set the schematic diagram of structure: in figure, breaker SbreAlso known as start switch, it is used to start or disconnect the power supply letter of whole device
Number；Resistance RstFor start-up resistor；Switch SstAlso known as by-pass switch, it is used for start-up resistor RstBypass operation is carried out, thus will
Start-up resistor is cut off from charging circuit；SM in figure is submodule, includes what several were concatenated on each bridge arm
Submodule.The circuit diagram of each submodule is then as shown in Figure 2, wherein the side a and b in figure is that submodule is positive/negative
Extremely.
The starting charging of existing flexible island direct current transmission system island converter station is as follows: additional DC voltage source is used,
It charges to single submodule, detects whether the submodule capacitor voltage being electrically charged reaches rated value after powering on successfully.
Although each submodule can be charged to rated value by this charging method, operating process is complex, and when charging
Between it is longer, and need additional independent current source, economy is poor.In addition MMC is using sub-module cascade structure, for balance electricity
Hold voltage, generally capacitor is ranked up using sort algorithm, if submodule is to be electrically charged, puts into the low son of capacitance voltage
Module puts into the high submodule of capacitance voltage if submodule is to be discharged.
The starting charging process of existing flexible island direct current transmission system island converter station, often the starting time is relatively slow,
It cannot faster put into operation and convey electric energy, seriously affect the economy and quickly operation of converter station.
Summary of the invention
The purpose of the present invention is to provide it is a kind of can be quick, safe and reliable and without impact and dead-beat to flexible straight
Stream transmission system isolated island converter station carries out the starting charging method of the flexible island direct current transmission system island converter station of starting charging.
The starting charging method of this flexible island direct current transmission system island converter station provided by the invention, including walk as follows
It is rapid:
S1. converter station is in starting charging preparation state；
S2. converter station starting charging, converter station enter uncontrollable charged state；
S3. converter station detects the charge parameter of each bridge arm, and terminates converter station in due course according to the charge parameter that detection obtains
Uncontrollable charged state；
S4. converter station starts the active charge strategy with damping control, and converter station enters active charge state；
S5. converter station detects the charge parameter of each bridge arm, and terminates the change of current in due course according to the charge parameter that detection obtains
The active charge state stood, to complete the starting charging of converter station.
The starting charging method of the flexible island direct current transmission system island converter station further includes following steps:
S6. submodule puts into initial value after calculating maintenance；
S7. after maintenance, submodule investment initial value puts into submodule after the maintenance obtained according to step S6, to guarantee
Non-impact current when putting into submodule after maintenance.
Submodule puts into initial value after the calculating maintenance, and submodule is thrown after specially calculating maintenance using following formula
Enter initial value nst0:
N in formulast0Initial value is put into for submodule after maintenance, round () is to take nearest integer function, UdcNFor nominal DC
Voltage, Uc_ave0For bridge arm capacitance voltage average value.
The maximum power of start-up resistor is calculated using following formula:
P in formulaRst_maxFor the maximum power of start-up resistor；RstFor start-up resistor value；Udc0_maxFor the access of isolated island converter station
The possible maximum steady state DC voltage value of point；CstFor the equivalent capacitance value during the uncontrollable charging of isolated island converter station；L changes for isolated island
The equivalent reactance of access point is arrived at stream station.
The resistance value of start-up resistor is to be calculated using following formula:
R in formulastFor the resistance value of start-up resistor；UdcNFor rated direct voltage；M is modulation degree；For power-factor angle；
Iarm_limFor bridge arm maximum allowed current value；PNFor rated active power；Cmmc=6CT/N2, changed for isolated island in controllable charging process
Stream station equivalent capacity；AndWherein kpdcAnd kidc
For constant DC voltage control device parameter, RΣFor the equivalent resistance of isolated island converter station to constant DC voltage control station.
Converter station described in step S1 is in starting charging preparation state, specially by the by-pass switch of converter station and starting
Switch disconnects.
The starting charging of converter station described in step S2, converter station enters uncontrollable charged state, specially by converter station
Closure is started switch, and by-pass switch is disconnected.
Terminate the uncontrollable charged state of converter station described in step S3 in due course according to the charge parameter that detection obtains, specifically
To use following steps to terminate the uncontrollable charged state of converter station:
Whether A. detection all submodule draw-out power supplies of converter station power on succeeds:
If draw-out power supply powers on unsuccessful, converter station continues to uncontrollable charged state；
If draw-out power supply powers on success, converter station continues subsequent step；
B. the capacitance voltage of submodule and the charging current on each bridge arm on each bridge arm of converter station are detected, and right
Each bridge arm is detected as follows:
If the sum of the capacitance voltage of each submodule reaches the first voltage threshold value of setting on bridge arm, and the charging electricity on bridge arm
Stream is less than the first current threshold of setting, then the bridge arm is regarded as meeting testing conditions, otherwise assert that the bridge arm is unsatisfactory for detecting
Condition；
If C. each bridge arm is all satisfied the testing conditions of step B, terminate the uncontrollable charged state of converter station, otherwise then
Continue the uncontrollable charged state of converter station until each bridge arm is all satisfied the testing conditions of step B.
Active charge strategy of the starting described in step S4 with damping control, specially using following steps starting band damping
The active charge strategy of control:
A. it is closed by-pass switch, start-up resistor is cut off from circuit；
B. calculate each bridge arm by the submodule number of investment from the submodule number currently put into set first
Rate gradually decreases down the decline curve of target investment submodule number, and it is each according to decline curve to obtain each control moment
The submodule number reference value of bridge arm investment；
C. it controls each bridge arm and obtains the submodule number of investment according to step b from the submodule number currently put into
The submodule number reference value of each bridge arm investment of each control moment put into or cut off；
D. during the submodule of step c investment or excision, the straight of each bridge arm is obtained at each control moment
Galvanic electricity stream, and calculated to obtain the compensation submodule number of each bridge arm according to the DC current of acquisition；
E. the submodule number for each bridge arm investment that the compensation submodule number and step b obtained according to step d obtains
Reference value, submodule end value should be put by obtaining each bridge arm at the currently control moment；
F. each bridge arm obtained according to step e should put into submodule end value the currently control moment, realize each
Submodule switching of the bridge arm at the currently control moment.
The first rate of setting described in step b specially calculates first rate k using following formular:
P in formulaN_udcFor the rated active power of constant DC voltage control station, N is every mutually specified investment submodule number,
Idc_limFor the DC current maximum value that constant DC voltage control station allows, T is the total number of modules of each bridge arm, and C is submodule capacitor
Value, UdcNFor rated direct voltage；The first rate krFor the slope of decline.
It is referred to described in step b according to the submodule number that decline curve obtains each bridge arm investment of each control moment
Value obtains the submodule number theoretical value of each bridge arm investment at each control moment specially according to obtained decline curve,
And the submodule number theoretical value of each bridge arm investment at each control moment that will acquire round up obtaining often
The submodule number reference value of a control moment each bridge arm investment.
DC current described in step d according to acquisition calculates to obtain the compensation submodule number of each bridge arm, specially
Calculate using following formula the compensation submodule number Num of each bridge arm:
N is every mutually specified investment submodule number, U in formuladcNFor rated direct voltage, s is Laplace operator, khpfFor height
Pass filter gain, ωhpfFor the bandwidth of high-pass filter, idcIt (t) is DC current instantaneous value, L-1() is anti-Laplce change
Conversion.
Each bridge arm is obtained described in step e should put into submodule end value at the currently control moment, specially incite somebody to action
The compensation submodule number arrived is added with the submodule number reference value that each bridge arm is put into, and will be apart from nearest whole of additive value
Number should put into submodule end value at the currently control moment as each bridge arm.
The each bridge arm obtained described in step f according to step e should put into submodule end value the currently control moment
Realize that each bridge arm in the submodule switching at currently control moment, is specially controlled according to each bridge arm that step e is obtained currently
Moment processed should put into submodule end value, calculate each bridge arm in the son at currently control moment using capacitance voltage sort algorithm
Module switching strategy, and realize each bridge arm in the submodule switching at currently control moment according to submodule switching strategy.
Terminate the active charge state of converter station described in step S5 in due course according to the charge parameter that detection obtains, specially
Terminate the active charge state of converter station using following steps:
The capacitance voltage of submodule and the DC current on each bridge arm on each bridge arm of converter station are detected, and to every
One bridge arm is detected as follows:
If the capacitance voltage of each submodule reaches the second voltage threshold value being previously set, and DC current is less than setting
Second current threshold then assert that active charge state terminates；
If the capacitance voltage of each submodule is not up to the second voltage threshold value being previously set or DC current is not less than
Second current threshold of setting, then assert that active charge state is not finished.
The starting charging method of this flexible island direct current transmission system island converter station provided by the invention, passes through compensating module
Calculating and addition, realize the starting charging process of flexible island direct current transmission system island converter station it is smooth, without impact and nothing
Oscillation, and start-up course does not need the cooperation of other converter stations, is suitable for isolated island converter station, and start-up course safely may be used
It leans on, on other converter stations without influence；In addition, the method for the present invention is simple and reliable, it is easy to Project Realization.
Detailed description of the invention
Fig. 1 is the showing based on modularization multi-level converter and its starter configuration structure of existing soft straight converter station
It is intended to
Fig. 2 is the circuit theory schematic diagram of existing submodule.
Fig. 3 is the method flow diagram of the method for the present invention.
Fig. 4 is that the bridge arm submodule of the method for the present invention puts into the transformation schematic diagram of number.
Fig. 5 is the wave simulation schematic diagram of the starting charging process of the method for the present invention.
Specific embodiment
Be illustrated in figure 3 the method flow diagram of the method for the present invention: this flexible HVDC transmission system provided by the invention is lonely
Starting charging method of the island converter station without impact and oscillation, includes the following steps:
S1. the by-pass switch of converter station and starting switch is disconnected, converter station is in starting charging preparation state；
S2. converter station is started switch into closure, and by-pass switch is disconnected, converter station starting charging, converter station into
Enter uncontrollable charged state；
S3. converter station detects the charge parameter of each bridge arm, and terminates converter station in due course according to the charge parameter that detection obtains
Uncontrollable charged state；Specially terminate the uncontrollable charged state of converter station using following steps:
Whether A. detection all submodule draw-out power supplies of converter station power on succeeds:
If draw-out power supply powers on unsuccessful, converter station continues to uncontrollable charged state；
If draw-out power supply powers on success, converter station continues subsequent step；
B. the capacitance voltage of submodule and the charging current on each bridge arm on each bridge arm of converter station are detected, and right
Each bridge arm is detected as follows:
If the sum of the capacitance voltage of each submodule reaches the first voltage threshold value of setting on bridge arm, and the charging electricity on bridge arm
Stream is less than the first current threshold of setting, then the bridge arm is regarded as meeting testing conditions, otherwise assert that the bridge arm is unsatisfactory for detecting
Condition；
If C. each bridge arm is all satisfied the testing conditions of step B, terminate the uncontrollable charged state of converter station, otherwise then
Continue the uncontrollable charged state of converter station until each bridge arm is all satisfied the testing conditions of step B；
S4. converter station starts the active charge strategy with damping control, and converter station enters active charge state；Specially adopt
Start the active charge strategy (detailed process is as shown in Figure 4) with damping control with following steps:
A. it is closed by-pass switch, start-up resistor is cut off from circuit；
B. calculate each bridge arm by the submodule number of investment from the submodule number currently put into set first
Rate gradually decreases down the decline curve of target investment submodule number, and it is each according to decline curve to obtain each control moment
The submodule number reference value of bridge arm investment；
In the specific implementation, first rate k is calculated using following formular:
P in formulaN_udcFor the rated active power of constant DC voltage control station, N is every mutually specified investment submodule number,
Idc_limFor the DC current maximum value that constant DC voltage control station allows, T is the total number of modules of each bridge arm, and C is submodule capacitor
Value, UdcNFor rated direct voltage；The first rate krFor the slope of decline；
Meanwhile according to obtained decline curve, the submodule mathematics of each bridge arm investment at each control moment is obtained
By value, and the submodule number theoretical value of each bridge arm investment at each control moment that will acquire round up obtaining
To the submodule number reference value of each bridge arm investment of each control moment；
C. it controls each bridge arm and obtains the submodule number of investment according to step b from the submodule number currently put into
The submodule number reference value of each bridge arm investment of each control moment put into or cut off；
D. during the submodule of step c investment or excision, the straight of each bridge arm is obtained at each control moment
Galvanic electricity stream, and calculated to obtain the compensation submodule number of each bridge arm according to the DC current of acquisition；Specially calculated using following
Formula calculate the compensation submodule number Num of each bridge arm:
N is every mutually specified investment submodule number, U in formuladcNFor rated direct voltage, s is Laplace operator, khpfFor height
Pass filter gain, ωhpfFor the bandwidth of high-pass filter, idcIt (t) is DC current instantaneous value, L-1() is anti-Laplce change
Conversion.
E. the submodule number for each bridge arm investment that the compensation submodule number and step b obtained according to step d obtains
Reference value, submodule end value should be put by obtaining each bridge arm at the currently control moment；The compensation submodule that will specially obtain
Block number is added with the submodule number reference value that each bridge arm is put into, and using the integer nearest apart from additive value as each bridge
Arm should put into submodule end value the currently control moment；
F. each bridge arm obtained according to step e should put into submodule end value the currently control moment, realize each
Submodule switching of the bridge arm at the currently control moment；The each bridge arm specially obtained according to step e is at the currently control moment
Submodule end value should be put into, each bridge arm is calculated in the submodule switching at currently control moment using capacitance voltage sort algorithm
Strategy, and realize each bridge arm in the submodule switching at currently control moment according to submodule switching strategy；
S5. converter station detects the charge parameter of each bridge arm, and terminates the change of current in due course according to the charge parameter that detection obtains
The active charge state stood, to complete the starting charging of converter station；Specially terminate the active of converter station using following steps
Charged state:
The capacitance voltage of submodule and the DC current on each bridge arm on each bridge arm of converter station are detected, and to every
One bridge arm is detected as follows:
If the capacitance voltage of each submodule reaches the second voltage threshold value being previously set, and DC current is less than setting
Second current threshold then assert that active charge state terminates；
If the capacitance voltage of each submodule is not up to the second voltage threshold value being previously set or DC current is not less than
Second current threshold of setting, then assert that active charge state is not finished；
S6. submodule puts into initial value after calculating maintenance；Submodule is put into after specially calculating maintenance using following formula
Initial value nst0:
N in formulast0Initial value is put into for submodule after maintenance, round () is to take nearest integer function, UdcNFor nominal DC
Voltage, Uc_ave0For bridge arm capacitance voltage average value；
S7. after maintenance, submodule investment initial value puts into submodule after the maintenance obtained according to step S6, to guarantee
Non-impact current when putting into submodule after maintenance.
In the specific implementation, the maximum power of start-up resistor is calculated using following formula:
P in formulaRst_maxFor the maximum power of start-up resistor；RstFor start-up resistor value；Udc0_maxFor the access of isolated island converter station
The possible maximum steady state DC voltage value of point；CstFor the equivalent capacitance value during the uncontrollable charging of isolated island converter station；L changes for isolated island
The equivalent reactance of access point is arrived at stream station.
Meanwhile the resistance value of start-up resistor is to be calculated and chosen using following formula:
R in formulastFor the resistance value of start-up resistor；UdcNFor rated direct voltage；M is modulation degree；For power-factor angle；
Iarm_limFor bridge arm maximum allowed current value；PNFor rated active power；Cmmc=6CT/N2, changed for isolated island in controllable charging process
Stream station equivalent capacity；AndWherein kpdcAnd kidc
For constant DC voltage control device parameter, RΣFor the equivalent resistance of isolated island converter station to constant DC voltage control station.
In addition, the energy of start-up resistor consumption is also relatively small in the method for the present invention: the energy of start-up resistor consumption
Are as follows:C is submodule capacitor voltage in formula；Udc0_maxFor isolated island converter station tie point maximum steady state electricity
Pressure；T is each bridge arm submodule sum.
Be illustrated in figure 5 the wave simulation schematic diagram of the starting charging process of the method for the present invention: Time_0 is that starting can not
The charging time is controlled, Time_1 is the starting controllable active charge time, and Time_3 is the starting charging process end time.From Fig. 5's
Wave simulation schematic diagram can see, and using starting method of the invention, voltage and current does not have converter station during startup
Have oscillation, submodule capacitor voltage during controllable active charge rapid increase, constant DC voltage control station bridge arm current
Within the allowable range with DC current, will not trigger protection movement, start-up resistor only disappears in uncontrollable charging process
Energy consumption, controllable active charge do not consume energy after being removed in the process, can reduce the Fabrication parameter of start-up resistor, reduction is opened
Energy consumption, increases economic efficiency.
Claims (13)
1. a kind of starting charging method of flexible island direct current transmission system island converter station, includes the following steps:
S1. converter station is in starting charging preparation state；
S2. converter station starting charging, converter station enter uncontrollable charged state；
S3. converter station detects the charge parameter of each bridge arm, and terminates converter station in due course not according to the charge parameter that detection obtains
Controllable charged state；
S4. converter station starts the active charge strategy with damping control, and converter station enters active charge state；
S5. converter station detects the charge parameter of each bridge arm, and terminates converter station in due course according to the charge parameter that detection obtains
Active charge state, to complete the starting charging of converter station.
2. the starting charging method of flexible island direct current transmission system island converter station according to claim 1, it is characterised in that
Further include following steps:
S6. submodule puts into initial value after calculating maintenance；
S7. after maintenance, submodule investment initial value puts into submodule after the maintenance obtained according to step S6, to guarantee to overhaul
Non-impact current when putting into submodule afterwards.
3. the starting charging method of flexible island direct current transmission system island converter station according to claim 2, it is characterised in that
Submodule puts into initial value after the calculating maintenance, and submodule puts into initial value after specially calculating maintenance using following formula
nst0:
N in formulast0Initial value is put into for submodule after maintenance, round () is to take nearest integer function, UdcNFor rated DC current
Pressure, Uc_ave0For bridge arm capacitance voltage average value.
4. the starting charging method of flexible island direct current transmission system island converter station according to claim 1, it is characterised in that
The maximum power of start-up resistor is calculated using following formula:
P in formulaRst_maxFor the maximum power of start-up resistor；RstFor start-up resistor value；Udc0_maxIt may for isolated island converter station access point
Maximum steady state DC voltage value；CstFor the equivalent capacitance value during the uncontrollable charging of isolated island converter station；L is that isolated island converter station arrives
The equivalent reactance of access point.
5. the starting charging method of flexible island direct current transmission system island converter station according to claim 1, it is characterised in that
The resistance value of start-up resistor is to be calculated using following formula:
R in formulastFor the resistance value of start-up resistor；UdcNFor rated direct voltage；M is modulation degree；For power-factor angle；Iarm_lim
For bridge arm maximum allowed current value；PNFor rated active power；Cmmc=6CT/N2, it is isolated island converter station etc. in controllable charging process
Imitate capacitor；AndWherein kpdcAnd kidcIt is surely straight
Galvanic electricity pressure controller parameter, RΣFor the equivalent resistance of isolated island converter station to constant DC voltage control station.
6. the starting charging method of flexible island direct current transmission system island converter station described according to claim 1~one of 5, special
The uncontrollable charged state for being to terminate converter station described in step S3 in due course according to the charge parameter that detection obtains is levied, specially
Terminate the uncontrollable charged state of converter station using following steps:
Whether A. detection all submodule draw-out power supplies of converter station power on succeeds:
If draw-out power supply powers on unsuccessful, converter station continues to uncontrollable charged state；
If draw-out power supply powers on success, converter station continues subsequent step；
B. the capacitance voltage of submodule and the charging current on each bridge arm on each bridge arm of converter station are detected, and to each
A bridge arm is detected as follows:
If the sum of the capacitance voltage of each submodule reaches the first voltage threshold value of setting on bridge arm, and the charging current on bridge arm is small
In the first current threshold of setting, then the bridge arm is regarded as meeting testing conditions, otherwise assert that the bridge arm is unsatisfactory for testing conditions；
If C. each bridge arm is all satisfied the testing conditions of step B, terminates the uncontrollable charged state of converter station, otherwise then continue
The uncontrollable charged state of converter station is until each bridge arm is all satisfied the testing conditions of step B.
7. the starting charging method of flexible island direct current transmission system island converter station described according to claim 1~one of 5, special
Sign is active charge strategy of the starting described in step S4 with damping control, specially using following steps starting band damping control
The active charge strategy of system:
A. it is closed by-pass switch, start-up resistor is cut off from circuit；
B. first rate of each bridge arm by the submodule number of investment from the submodule number currently put into to set is calculated
The decline curve of target investment submodule number is gradually decreased down, and each control moment each bridge arm is obtained according to decline curve
The submodule number reference value of investment；
C. control each bridge arm the submodule number of investment is obtained from the submodule number currently put into according to step b it is every
The submodule number reference value of a control moment each bridge arm investment is put into or is cut off；
D. during the submodule of step c investment or excision, the direct current of each bridge arm is obtained at each control moment
Stream, and calculated to obtain the compensation submodule number of each bridge arm according to the DC current of acquisition；
E. the submodule number for each bridge arm investment that the compensation submodule number and step b obtained according to step d obtains refers to
Value, submodule end value should be put by obtaining each bridge arm at the currently control moment；
F. each bridge arm obtained according to step e should put into submodule end value the currently control moment, realize each bridge arm
In the submodule switching at currently control moment.
8. the starting charging method of flexible island direct current transmission system island converter station according to claim 7, it is characterised in that
The first rate of setting described in step b specially calculates first rate k using following formular:
P in formulaN_udcFor the rated active power of constant DC voltage control station, N is every mutually specified investment submodule number, Idc_limFor
The DC current maximum value that constant DC voltage control station allows, T are each bridge arm submodule sum, and C is submodule capacitance,
UdcNFor rated direct voltage；The first rate krFor the slope of decline.
9. the starting charging method of flexible island direct current transmission system island converter station according to claim 8, it is characterised in that
The submodule number reference value of each bridge arm investment of each control moment is obtained according to decline curve described in step b, specially
According to obtained decline curve, the submodule number theoretical value of each bridge arm investment at each control moment is obtained, and will acquire
Each control moment each bridge arm investment submodule number theoretical value round up to obtain each control when
Carve the submodule number reference value of each bridge arm investment.
10. the starting charging method of flexible island direct current transmission system island converter station according to claim 9, it is characterised in that
DC current described in step d according to acquisition calculates to obtain the compensation submodule number of each bridge arm, specially using as follows
Formula calculate the compensation submodule number Num of each bridge arm:
N is every mutually specified investment submodule number, U in formuladcNFor rated direct voltage, s is Laplace operator, khpfFor high pass filter
Wave device gain, ωhpfFor the bandwidth of high-pass filter, idcIt (t) is DC current instantaneous value, L-1() is reverse drawing Laplace transform calculation
Son.
11. the starting charging method of flexible island direct current transmission system island converter station according to claim 10, feature exist
Each bridge arm is obtained described in the step e should put into submodule end value, the benefit that will specially obtain at the currently control moment
Repay submodule number and be added with the submodule number reference value that each bridge arm is put into, and using the integer nearest apart from additive value as
Each bridge arm should put into submodule end value the currently control moment.
12. the starting charging method of flexible island direct current transmission system island converter station according to claim 11, feature exist
The each bridge arm obtained according to step e described in the step f the currently control moment should put into submodule end value realize it is every
Submodule switching of a bridge arm at the currently control moment, each bridge arm specially obtained according to step e is at the currently control moment
Should put into submodule end value, using capacitance voltage sort algorithm calculate each bridge arm currently control the moment submodule throw
Strategy is cut, and realizes each bridge arm in the submodule switching at currently control moment according to submodule switching strategy.
13. the starting charging method of flexible island direct current transmission system island converter station described according to claim 1~one of 5,
It is characterized in that terminating the active charge state of converter station described in step S5 in due course according to the charge parameter that detection obtains, specially
Terminate the active charge state of converter station using following steps:
The capacitance voltage of submodule and the DC current on each bridge arm on each bridge arm of converter station are detected, and to each
Bridge arm is detected as follows:
If the capacitance voltage of each submodule reaches the second voltage threshold value being previously set, and DC current is less than the second of setting
Current threshold then assert that active charge state terminates；
If the capacitance voltage of each submodule is not up to the second voltage threshold value being previously set or DC current not less than setting
The second current threshold, then assert that active charge state is not finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811185220.0A CN109149920B (en) | 2018-10-11 | 2018-10-11 | Starting charging method for flexible direct current transmission system island converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811185220.0A CN109149920B (en) | 2018-10-11 | 2018-10-11 | Starting charging method for flexible direct current transmission system island converter station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109149920A true CN109149920A (en) | 2019-01-04 |
| CN109149920B CN109149920B (en) | 2021-02-19 |
Family
ID=64811155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811185220.0A Active CN109149920B (en) | 2018-10-11 | 2018-10-11 | Starting charging method for flexible direct current transmission system island converter station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109149920B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165245A (en) * | 2020-07-31 | 2021-01-01 | 国电南瑞科技股份有限公司 | MMC converter starting method and system |
| CN112636388A (en) * | 2020-12-04 | 2021-04-09 | 全球能源互联网研究院有限公司 | Offshore full-direct-current wind power plant based on field-side port starting resistor and starting method |
| CN112653120A (en) * | 2020-11-30 | 2021-04-13 | 全球能源互联网研究院有限公司 | Offshore full-direct-current wind power plant based on machine-end starting resistor and starting method thereof |
| CN117155105A (en) * | 2023-11-01 | 2023-12-01 | 国网浙江省电力有限公司电力科学研究院 | Method and system for controlling starting of direct-current transformer of full direct-current system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080238394A1 (en) * | 2007-03-29 | 2008-10-02 | Fujitsu Limited | Dc-dc converter, power supply voltage supplying method, and power supply voltage supplying system |
| CN102857086A (en) * | 2012-09-12 | 2013-01-02 | 中国能源建设集团广东省电力设计研究院 | Device and method for starting three-terminal flexible direct-current power transmission system |
| CN105680681A (en) * | 2016-02-16 | 2016-06-15 | 南方电网科学研究院有限责任公司 | Clamping type single sub-module-based starting method for modular multilevel converter |
| US9653990B1 (en) * | 2015-11-20 | 2017-05-16 | STMicroelectronics (Shenzhen) R&D Co. Ltd | Negative charge pump with soft start |
| CN107947618A (en) * | 2017-12-12 | 2018-04-20 | 荣信汇科电气技术有限责任公司 | The controllable charging method of converter valve exchange side based on h-bridge mixed connection topology |
| CN108471246A (en) * | 2018-04-10 | 2018-08-31 | 国家电网公司 | A kind of control method for reducing modularization multi-level converter switching device pressure-bearing |
| CN109412187A (en) * | 2018-09-26 | 2019-03-01 | 国家电网有限公司 | A kind of flexible island direct current transmission system island converter station starting charging unit and method |
-
2018
- 2018-10-11 CN CN201811185220.0A patent/CN109149920B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080238394A1 (en) * | 2007-03-29 | 2008-10-02 | Fujitsu Limited | Dc-dc converter, power supply voltage supplying method, and power supply voltage supplying system |
| CN102857086A (en) * | 2012-09-12 | 2013-01-02 | 中国能源建设集团广东省电力设计研究院 | Device and method for starting three-terminal flexible direct-current power transmission system |
| US9653990B1 (en) * | 2015-11-20 | 2017-05-16 | STMicroelectronics (Shenzhen) R&D Co. Ltd | Negative charge pump with soft start |
| CN105680681A (en) * | 2016-02-16 | 2016-06-15 | 南方电网科学研究院有限责任公司 | Clamping type single sub-module-based starting method for modular multilevel converter |
| CN107947618A (en) * | 2017-12-12 | 2018-04-20 | 荣信汇科电气技术有限责任公司 | The controllable charging method of converter valve exchange side based on h-bridge mixed connection topology |
| CN108471246A (en) * | 2018-04-10 | 2018-08-31 | 国家电网公司 | A kind of control method for reducing modularization multi-level converter switching device pressure-bearing |
| CN109412187A (en) * | 2018-09-26 | 2019-03-01 | 国家电网有限公司 | A kind of flexible island direct current transmission system island converter station starting charging unit and method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165245A (en) * | 2020-07-31 | 2021-01-01 | 国电南瑞科技股份有限公司 | MMC converter starting method and system |
| CN112653120A (en) * | 2020-11-30 | 2021-04-13 | 全球能源互联网研究院有限公司 | Offshore full-direct-current wind power plant based on machine-end starting resistor and starting method thereof |
| CN112653120B (en) * | 2020-11-30 | 2022-10-21 | 国网智能电网研究院有限公司 | Offshore full-direct-current wind power plant based on machine-end starting resistor and starting method thereof |
| CN112636388A (en) * | 2020-12-04 | 2021-04-09 | 全球能源互联网研究院有限公司 | Offshore full-direct-current wind power plant based on field-side port starting resistor and starting method |
| CN112636388B (en) * | 2020-12-04 | 2022-12-02 | 全球能源互联网研究院有限公司 | Offshore full-direct-current wind power plant based on field-side port starting resistor and starting method |
| CN117155105A (en) * | 2023-11-01 | 2023-12-01 | 国网浙江省电力有限公司电力科学研究院 | Method and system for controlling starting of direct-current transformer of full direct-current system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109149920B (en) | 2021-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109149920A (en) | The starting charging method of flexible island direct current transmission system island converter station | |
| CN109347136B (en) | Online withdrawing device and method for current converter of hybrid direct-current power transmission system | |
| CN110492519B (en) | VSC alternating current fault ride-through method and device for extra-high voltage hybrid multi-terminal direct current system | |
| CN102983568A (en) | Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start | |
| CN105720612B (en) | Method for inhibiting commutation failure of high-voltage direct-current transmission based on power bypass | |
| CN106711943A (en) | Protection device and method for distributed series-coupled power flow controller | |
| CN104242333A (en) | Self-excited starting method for modular multilevel inverter flexible direct current transmission system | |
| CN104821710A (en) | MMC-MTDC system starting control method | |
| CN104821711A (en) | Modularized multilevel flexible DC power transmission current converter starting method | |
| CN116317661B (en) | Alternating current starting control method and alternating current starting control system for AM-MMC (amplitude modulation-Modular multilevel converter) | |
| CN108155657A (en) | Energy accumulation current converter and its main circuit topological structure and balance control method | |
| CN104283235A (en) | Converter of wind generating set and control method and device of converter | |
| CN104821712A (en) | MMC-MTDC system coordination starting control method | |
| CN104009497A (en) | Low voltage ride through and active power filter compensation device of wind turbine generator and switching method | |
| WO2023202001A1 (en) | Wind farm grid-connection system with diode-rectified output transmission, and control and protection system | |
| CN105391293B (en) | Method for starting modularized multi-level flexible direct-current transmission converter | |
| CN114884112B (en) | Receiving end alternating current fault ride-through control method of hybrid cascade direct current transmission system | |
| CN108616135B (en) | Device and method for preventing three-phase imbalance countercurrent of user side of distributed photovoltaic power station | |
| CN111769583B (en) | Coordination control method for improving stability of cascade hybrid direct-current transmission system | |
| CN113612377A (en) | Starting method of offshore wind power direct current sending-out system | |
| CN110048593B (en) | Mixed MMC starting charging method | |
| CN115102217B (en) | Method for determining stable operation domain of MMC at receiving end of LCC-MMC hybrid cascaded direct-current power grid | |
| CN108666995A (en) | Dynamic is let out can device, equipment and DC transmission system | |
| CN108667038A (en) | A kind of high pressure SVG of low dash current and the startup method of deicing device | |
| CN108988269B (en) | Voltage source type ice melting device, control method and control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |