CN109428339A - It is a kind of suitable for the idle control of extra-high-voltage direct-current power transmission converter and the optimization method of harmonic wave - Google Patents
It is a kind of suitable for the idle control of extra-high-voltage direct-current power transmission converter and the optimization method of harmonic wave Download PDFInfo
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- CN109428339A CN109428339A CN201710747611.6A CN201710747611A CN109428339A CN 109428339 A CN109428339 A CN 109428339A CN 201710747611 A CN201710747611 A CN 201710747611A CN 109428339 A CN109428339 A CN 109428339A
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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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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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 a kind of idle control suitable for extra-high-voltage direct-current power transmission converter and harmonic wave optimization method, realize start-up and shut-down control, overvoltage control, the preferential selection control of filtering, automatic/hand switching control, under normal circumstances with Reactive power control when commutation failure.It is capable of the switching of On-line Control filter and capacitor group, the capacitor and filter group configured in converter station is utilized to greatest extent, so that reducing the reactive requirement to AC system when operating normally, reduce voltage fluctuation during direct-current commutation failure, and harmonic wave is pointedly reduced according to harmonic wave situation.
Description
Technical field
The present invention relates to electrical engineering extra-high voltage direct-current transmission control fields, specifically, being related to a kind of by converter station filter
The control of the switching of wave device and capacitor makes full use of equipment performance with configuration method, reaches stable DC power, inhibits voltage
Rapid fluctuations and specific aim filter out the effect of harmonic wave.
Background technique
Ac transmission of the extra-high voltage direct-current transmission compared to same voltage class, no Frequency Synchronization problem, (power) conveying
It is more stable；Because to only have positive and negative polarities transmission line of electricity to be not only lost small but also at low cost for it；DC control speed is fast, operability
Height, more suitable for long range and high-power power transmission.Extra-high voltage direct-current transmission uses thyristor transverter at present, and half control characteristic is determined
Having determined its normal commutation needs stronger alternating voltage to support, when normal operation needs to absorb a large amount of reactive powers, therefore the change of current
Station needs to configure a large amount of reactive power source, SVC, SVG Static Var Compensator that reactive compensation performance was relatively good at present have and same
Step camera, idle dynamic excellent, dynamic characteristic is good, can effectively support network voltage, but due to its rated capacity
Small, control complexity and cost limitation, only in part, converter station is mounted with some synchronous capacitors as dynamic reactive at present
It supports, and filter and capacitor are at low cost, power grade is high, controllability is high, easy to operate, to be widely used in extra-high voltage
In DC converter station.
Filter is that have the device for filtering out particular harmonic function made of capacitor and inductor combination, filter out harmonic wave it
It outside can also be provided for converter station and a part of idle to support alternating voltage.The combination of filter and capacitor is in current converter station
The characteristics of idle main source, filter and capacitor is modularization, and what is provided is idle one under specific frequency voltage
It is fixed.The reactive balance of power grid, it is desirable that change access component count to change the idle amount of offer, it is available it is idle be not to connect
Continuous variation, it is therefore desirable to control idle switching mode rationally to improve the performance of DC transmission system.
The valve control of traditional idle control section and DC control system and pole control are not in contact with, and only introduce the exchange of station control
Voltage, current signal, control target that converter station is idle is using the strategy for customizing curve, according to the active transmission function of practical alternating current-direct current
The corresponding power factor of rate value is idle to adjust, since operational objective strategy is single therefore its dynamic property is poor, in voltage and
During the vertiginous failure of power, the regulation performance of device cannot be given full play to.Present invention introduces what valve control and pole were controlled to change
Mutually unsuccessfully judge signal, actual conditions are run according to system and switch over control model automatically, has both met normal operation and reduced
Concussion also can better conform to various operating conditions during commutation failure occurs for direct current.
Summary of the invention
The purpose of the present invention is the configuring condition according to converter station filter and capacitor, by optimal control filter and
The switching of capacitor, Lai Gaishan UHVDC converter station reactive power exchange and a kind of control method for filtering out particular harmonic, with emphasis on
Meet minimum idle investment, under the premise of voltage is no more than certain value, reaches the idle minimum and commutation of ac and dc circuit transmission and lose
The smallest purpose of voltage fluctuation during losing.
A kind of idle control and harmonic wave optimization method suitable for extra-high-voltage direct-current power transmission converter, by converter station
It is idle to carry out reasonable disposition realization with filtering control unit.An AC network is accessed if it is single layer, then is configured a set of idle
With filtering control unit；If it is two AC networks of layer-specific access, then two sets of idle and filtering control units are configured.Control is single
Interference is not generated independently of each other between member, and control unit directly controls the switching of filter and capacitor.
To realize above-mentioned function, the present invention provides the switching control method of a kind of filter and capacitor, feature includes
Following steps:
(1) value volume and range of product of the filter and capacitor of the setting of statistics converter station, is divided into according to breaker connection
Big group is simultaneously numbered, and each big group (referred to as big group #) carries out each according to the connection of filter and capacitor group
Group's classification and number.
(2) it reads the change of current of alternating-current field mutual inductor and becomes exchange side voltage, current three-phase instantaneous value, calculate current alternating current-direct current transmission
Active power, reactive power value.Reading present filter and capacitor put into state, and calculating currently is what converter station provided
Without work value.The phase conversion failure judgment signal of valve control and pole control control is read to judge operating status.
(3) the minimum idle operation put into ensure direct current of setting.It is characterized in that the normal operation in order to guarantee converter station
The smallest idle and filter function provided in standing.Specifically, 1,2 group of filter of number can be set to minimum idle throwing
Enter, so that it is had basic filter function to guarantee that DC side is run, the no-power vacancy under the present situation is provided by exchange side.
(4) setting operation ceiling voltage.When detecting DC voltage more than 1.1 per unit value, the excision one of setting a period of time is small
Group filter or capacitor, until minimum idle investment or voltage are restored to normal operating voltage maximum value.When being resected to
When minimum idle investment voltage still is unsatisfactory for requiring, output voltage drop low signal is to transformer tapping control and valve control.
(5) setting harmonic wave preferentially filters out standard, calculates 12 subharmonic of voltage, 24 subharmonic, 3 times with fast fourier algorithm
The content of harmonic wave.Larger based on 12 subharmonic contents under normal condition, it is as follows that setting filters preferential selection criteria: under normal circumstances
Filtering out harmonic wave priority is 12 subharmonic >, 24 subharmonic >, 3 subharmonic；It is filtered when 24 subharmonic contents are more than the 75% of 12 times
Except 24 subharmonic be set to it is optimal, when 3 subharmonic be more than total harmonic distortion 14% when filter out 3 subharmonic be set to it is optimal；If 3 subharmonic
When meeting above-mentioned condition simultaneously with 24 subharmonic contents, it is set to 3 subharmonic >, 24 subharmonic >, 12 subharmonic.Furthermore priority is high
First throwing, priority is low first to cut.
(6) to reduce alternating current-direct current reactive power exchange and reduce two target strategies of voltage fluctuation.The commutation read according to step 2
The numerical value of failure judgment module, to being target and to reduce alternating current-direct current reactive power exchange as two of target fortune to reduce voltage fluctuation
Row mode switches over.
(7) when reducing under alternating current-direct current reactive power exchange mode, alternating current-direct current reactive power exchange threshold value is set.What once route passed through
It is idle be more than threshold value when (be positive with flowing into converter station direction, be consistent below), throw/cut one group of filter or capacitor.?
Startup stage updates reactive command value quickly quickly to keep up with the variation of power；The operation phase at relatively slow speeds more
New command value, to reduce unnecessary fluctuation.
(8) when in reducing under voltage fluctuation mode, voltage regeneration rate threshold value is set.In order to reduce DC voltage wave
It is dynamic, lacking for converter station reactive power is calculated according to the active power that current line transmits using current DC operating voltage as target
Volume, controlling filter and capacitor switching capacity makes poor therewith to reach minimum value.When detecting that it is fast that DC voltage restores (risings)
When degree is more than the voltage regeneration rate threshold value of setting, it is switched to and calculates lacking for converter station reactive power by target value of reference voltage
Volume, controlling filter and capacitor switching capacity makes poor therewith to reach minimum value.
(9) when needing to put into filter group and capacitor group, filter group is first put into and according to the priority of step (5)
Switching is carried out with small group #.The high first investment of priority, same priority put into from small to large according to small group #, finally put into
Capacitor.When needing surgical filtering device group and capacitor group, capacitor group is first cut off, is cut again after the excision of capacitor group
Except filter group, according to the reverse-order surgical filtering device group of above-mentioned investment filter group step.
(10) controlling unit is divided into and is manually and automatically controlled.Filter group under the idle investment of minimum of converter station not by
Outer with automatic control manually, other valve groups are all controlled by manual with automatic.In order to reduce alternating current-direct current reactive power exchange amount, direct current
Locking in a period of time of starting is unlocked to manually control.It automatically controls and switching is carried out according to the control strategy of (4-9 step).
(11) direct current locking backed off after random filter and capacitor group.When slave station control obtains block signal, ring is exited in starting
Section, operation switch to automatic control, continue (4-9 step).When detecting voltage to 0, the minimum idle investment of excision.
Grouping described in above-mentioned steps (1): big group grouping is grouped according to electrical wiring, organizes big group of breaker control sheet
The switching of filter and capacitor.Group is according to practical connection relationship and has the device cell point for filtering out particular harmonic function
Group.
Number described in above-mentioned steps (1): arranging according to big group #, first arranges this big group, according to type in this big group
One two three four arrangements, this big group device, which has arranged, rearranges next big group.Wherein the filter group for filtering out 11/13 subharmonic is determined
For type one；The filter group for filtering out 24/36 subharmonic is set to type two；The filter group for filtering out 3 subharmonic is set to class
Type three；Capacitor group is set to type four.
Reactive power value described in above-mentioned steps (2) calculates step are as follows: voltage, current signal are by filtering and Park Transformation
(ABC to dq0) obtains the voltage of DQ axis, current component Ud、UqAnd Id、Iq, active P=Ud·Id-Uq·Iq, idle Q=Ud·Iq
+Uq·Id.The sum of the rated power of the filter group and capacitor group of investment, which is denoted as, has currently put into reactive power.
If it is more than 1.1 per unit values that DC voltage occurs when in manually controlling, controller sounds an alarm above-mentioned steps (4)
Prompt operations staff's surgical filtering device group or capacitor group, stopping when voltage is met the requirements.
Valve control and pole control of above-mentioned steps (6) the phase conversion failure judgment module by signal from converter station.Converter station operates normally
When its value be in low potential, at this moment it is idle control in reduce alternating current-direct current reactive power exchange mode.Its value is in during commutation failure
High potential, idle control is in reduction voltage fluctuation mode.Two operational modes can mutually switch according to real value, and be in pair
Vertical relationship.
Above-mentioned steps (7) reduce reactive power exchange mode: once route pass through it is idle more than power reference value ± 0.1 when
(being positive with flowing into converter station direction, be consistent below), throws/cuts one group of filter or capacitor.Its renewal frequency can be set
It is set to: updates within every 0.2 second 10 seconds before activation primary；After starting 10 seconds, controls output signal every 4 seconds and update once.
Inverter consumes idle calculation formula in above-mentioned steps (8) are as follows:
In formula: PdcIt is also active power for dc power；QdcReactive power is consumed for inverter；XcFor commutating reactance, etc.
It imitates in transformer leakage reactance；μ is angle of overlap；φ is converter power factor；IdFor DC current；E11For the unloaded electricity of converter transformer valve side
It is pressed with valid value；α is rectification side Trigger Angle.
As shown in above formula, alternating voltage, the DC current substitution above formula during commutation failure can be calculated and need nothing
Function, each filter group and capacitor group provide idle during commutation failure are as follows: Q=(U/UN)2QN.Reactive requirement amount subtracts
The idle idle amount for as needing switching currently provided, switching filters and capacitor are minimized.
Judge that the threshold value of DC voltage resume speed is set to 0.5pu/0.1s.It will when detecting that DC voltage meets threshold value
DC voltage control target is changed to a reference value.Renewal frequency can be set to 0.04 second.
Above-mentioned steps (10) start the minimum idle amount of link investment, and 1 filter group of number was specifically put at 0.1 second,
2 filter group of number was put at 0.5 second, this two groups of filters are only put into direct current starting not by manual/auto control,
Backed off after random is latched in direct current.
Above-mentioned steps (10) automatically control output result and are not involved in control, be only output to control room during manually controlling
It is referred to for operations staff.
The present invention also provides the switching powder operation devices of a kind of filter and capacitor, which is characterized in that described device includes:
Voltage zero-cross detection and breaker cut-off control.Its control method is, when control switching teletype command to this actuating
It when device, is kept for the time of one cycle of signal, detects the zero crossing of three-phase alternating voltage respectively, when certain phase voltage zero passage, behaviour
Signal is transmitted to the phase breaker and executes switching movement by dynamic device.
The present invention is suitable for filter and the capacitor switching control of extra-high voltage direct-current transmission engineering converter station, can be in maximum
It is special using its reactive compensation performance and the optimal dynamic operation for filtering out promotion inverter while harmonic wave guarantees that system operates normally
Property.
Detailed description of the invention
Fig. 1 is idle and harmonic wave Optimal Control System main block diagram
Fig. 2 is the filter group of converter station and capacitor group is UHVDC converter station electrical wiring and number figure
Fig. 3 is the minimum idle amount investment logic chart of starting link
Fig. 4 is Reactive power control logic chart
Fig. 5 is the control logic figure of idle switching powder operation device
Specific embodiment
It is typical real below in conjunction with attached drawing and one to clearly show that application and implementation process of the present invention in above-mentioned steps
Example is described in further detail idle control and harmonic wave optimization method:
The main structure that the present invention realizes: Fig. 1 is the main block diagram of idle control and harmonic wave optimization method.Implementing this
It may include the whole of Fig. 1 when the idle and harmonic wave Optimal Control System of invention, can also only include certain part therein.Such as figure
It include: information acquisition module, control system, powder operation device shown in 1.Wherein: voltage, current information come from primary system；Starting
Signal, block signal, manual/auto switching signal are from control room；Phase conversion failure judgment module by signal from valve control and
Pole control.Powerless control system module is transmitted information to by communication port by handling after information acquisition module acquisition data,
It result is transported to actuating module by calculating is filtered the switching operation of device group and capacitor group and realize optimal control function
Energy.
Realize a Typical Disposition of example: filter and electricity in the extra-high voltage direct-current transmission engineering of rated power 8000MW
One Typical Disposition of container is as shown in table 1.Wherein type one uses BP11/BP13 filter (250MW), and type two uses
HP24/36 filter (250MW), type three use HP3 filter (360MW), and type four uses SC shunt capacitor
(360MW)。
1 Reactive Power Device Typical Disposition table of table
The component in table 1 is numbered as shown in Figure 2 according to above-mentioned numbering principle.Component is divided into according to electrical wiring
Four big groups, respectively correspond first big group, second largest group, the third-largest group, the fourth-largest group in Fig. 2.When component type has residue
Include four seed types per big group, is replaced when component type is without residue with type four.
The present invention be suitable for extra-high-voltage direct-current power transmission converter idle control and harmonic wave optimization method operation be divided into
Lower step is realized.
Step S101 reads converter transformer valve side ac bus voltage, current value, and control signal, calculates active and reactive function
Rate carries out priority arrangement to filter switching.
Specifically, the change of current is read from sensor and become exchange side voltage and current three-phase instantaneous value, calculate current alternating current-direct current transmission
Active power, reactive power value, calculate step are as follows: voltage, current signal by filtering and Park Transformation (ABC to dq0) must
To Ud、UqAnd Id、Iq, active P=UdId-UqIq, idle Q=UdIq+UqId.Read present filter and capacitor investment state simultaneously
Calculate current idle filter apparatus be converter station provide without work value, calculation formula are as follows: Q=(U/UN)2QN, QNFor rated power.
In addition it is also necessary to which the signal read includes: unlocking signal, block signal, manual/auto the control letter of control room
Number, the phase conversion failure judgment signal of the control of DC control system valve and pole control.
Further, 12 subharmonic of voltage, the content of 24 subharmonic, 3 subharmonic are read with fast fourier algorithm.Normally
In the case of filter out harmonic wave priority be 12 subharmonic >, 24 subharmonic >, 3 subharmonic；When 24 subharmonic contents are more than 12 times
Filtered out when 75% 24 subharmonic be set to it is optimal, when 3 subharmonic be more than total harmonic distortion 14% when filter out 3 subharmonic be set to it is optimal,
And 3 subharmonic and 24 subharmonic contents when meeting above-mentioned condition simultaneously, it is preferential with 3 subharmonic.The high first throwing of priority, priority
Low first cuts.Capacitor group is thrown after first throwing filter group, cuts filter group after first cutting capacitor group.
Step S102 is as shown in the starting of Fig. 3 direct current, the investment of minimum idle amount, is the filtering effect in order to guarantee to have most basic
Fruit.The idle amount of minimum of this example as shown in dashed box in Fig. 2 is set to type one and two each one groups of type.Specifically in starting 0.1
Second when put into one filter of a set type, two filter of a set type was put at 0.5 second, this two groups of filters not by manually/
It automatically controls, is only put into direct current starting, be latched backed off after random in direct current.
Step S103 guarantees that DC voltage is met the requirements.Specifically, when detecting that DC voltage is more than 1.1 per unit value,
According to switching sequential selection in step S101, a small group filter group put into or capacitor group are cut off within every 3 seconds until minimum
Until when idle investment or DC voltage are lower than 1.1 per unit value.
Step S104 judges the operating status of direct current according to the value of the phase conversion failure judgment module of control system.Sentence when being 0
Break as there is no commutation failures, at this moment to reduce alternating current-direct current reactive power exchange mode operation.Specifically, it is calculated according to step S101
Out alternating current-direct current exchange reactive power be reference, more than power per unit value absolute value 0.1 when just generate a switching signal.
Power is that timing puts into one group of filter group or capacitor group, and be negative one group of filter group of excision or capacitor group；Judge when being 1
Reduce DC voltage fluctuation mode to be at this moment switched to during commutation failure.Specifically, using current running voltage as target, root
The reactive power that converter station needs is calculated according to formula 1, controls filter group and capacitor group switching, by its value and puts into idle difference
Reach minimum.When detecting the super multi-threshold 0.5pu/0.1s of voltage recovery rate, it is switched to and is calculated by target of reference voltage
The reactive power that converter station needs, controlling filter group and capacitor group switching capacity makes poor therewith to reach minimum.In this example
α is set to 15 °.Exchange side voltage during commutation failure, DC current, the change of current are become to the active power generation of leakage reactance and direct current
Enter the reactive power that above formula calculates inverter consumption, further according to Q=(U/UN)2QN, calculate and currently put into filter and electricity
The reactive power that container provides, subtracts each other and obtains idle difference, will according to the minimum target value switching filters of difference and capacitor
Difference is offset to minimum value.In order to quickly inhibit the fluctuation of voltage, renewal frequency is improved, it is determined as 0.05 second.
The movement of above-mentioned investment/excision starts in preceding 10 seconds update in every 0.2 second once to start in direct current transportation
Stage quickly keeps up with the rising of power, is updated once after direct current transportation starts 10 seconds with every 4 seconds.Switching selection and step S101
It is identical.
The manual/auto switching of step S105.The present invention supports the automatic/hand handoff functionality of the idle control of converter station, tool
Body, it automatically controls and switching is carried out by above-mentioned control system automatically.It manually controls and switching is carried out by control room operator.Work as place
When manually controlling, automatic control at this moment is also at operating status, but does not have control authority, and control is only passed in control output
Room is for operation operator's reference.When in manually controlling, at first 10 seconds of direct current starting in by masked state, at this section
Phase is idle, and control can be only in automatic control mode.Under manual control when DC voltage occurs more than 1.1 per unit value, control
Device sounds an alarm the operation that prompt operations staff carries out surgical filtering device group or capacitor group, alarm when voltage is met the requirements
Stop.In when manually controlling, when it is 1 that the output of phase conversion failure judgment module, which occurs, manually controls and automatically switch to automatic control
System, and in step S104 to reduce voltage fluctuation mode operation.When the output of phase conversion failure judgment module reverts to 0, automatically
Switch back into MANUAL CONTROL mode.
Above-mentioned steps S103~S105 main body control logic is as shown in Figure 4.
Step S106 direct current is stopped transport.Specifically, slave station control obtains block signal, starting is exited link, is continued
(S101-S105 step).When detecting voltage to 0, the minimum idle investment of excision, filters and electricity of whole other investments of excision
Container.
The idle control of extra-high-voltage direct-current power transmission converter of the present invention and harmonic wave optimization method also provide idle switching actuating
The rate-determining steps of device.Specifically, as shown in figure 5, for protecting filter and capacitor and the overvoltage for reducing switching operation,
When controlling switching teletype command and arriving this powder operation device, kept for the time of signal one cycle, respectively detection three-phase alternating voltage
Zero crossing, when certain phase voltage zero passage, signal is transmitted to the phase breaker and executes switching by powder operation device to be acted.
Example discussed above, description, but can not be with these more in detail as of the invention one preferably example
And the invention patent range is restricted.It should be pointed out that the modification and improvement that it is made under the premise of the present invention, these
Belong to protection scope of the present invention.Therefore, the scope of protection of the patent of the present invention should be subject to appended claims.
Claims (9)
1. a kind of idle control and harmonic wave optimization method suitable for extra-high-voltage direct-current power transmission converter, which is characterized in that including
Step:
(1) filter group and capacitor group are classified and is numbered.Big group # is carried out according to breaker connection, according to filtering
The connection of device group and capacitor group is to each small group #.The filter group for filtering out 11/13 subharmonic is set to type one；
The filter group for filtering out 24/36 subharmonic is set to type two；The filter group for filtering out 3 subharmonic is set to type three；It will simultaneously
Connection capacitor group is set to type four.
(2) it the input of signal: reads the change of current and becomes exchange side voltage, current three-phase instantaneous value, calculate having for current alternating current-direct current transmission
Function power, reactive power value；Reading present filter group and capacitor group investment state and calculating are currently what converter station provided
Reactive power；Read the phase conversion failure judgment signal of valve control and pole control.
(3) the minimum idle investment of setting.One filter group of type and each one group of two filter group of type are at least set.
(4) setting operation ceiling voltage.When detecting DC voltage more than 1.1 per unit value, a small group filter is cut off at regular intervals
Wave device group or capacitor group are until minimum idle investment or DC voltage are restored to 1.1 per unit values or less.
(5) setting harmonic wave preferentially filters out standard.Read 12 subharmonic of alternating voltage, the content of 24 subharmonic, 3 subharmonic.Just
It is 12 subharmonic >, 24 subharmonic >, 3 subharmonic that harmonic wave priority is filtered out in normal situation；When 24 subharmonic contents are more than 12 times
To be filtered out when certain proportion 24 subharmonic be set to it is optimal, when 3 subharmonic be more than total harmonic distortion certain proportion when will filter out 3 times it is humorous
Wave is set to optimal；If 3 subharmonic and 24 subharmonic contents meet above-mentioned condition simultaneously, it is set to 3 subharmonic >, 24 subharmonic >
12 subharmonic.Furthermore the high first throwing of priority, priority is low first to cut.
(6) operation is divided into reduce alternating current-direct current reactive power exchange and reduce two target strategies of voltage fluctuation.It reads commutation and loses
The numerical value of judgment module is lost, and two operational modes are switched over according to its value.
(7) when reducing under alternating current-direct current reactive power exchange mode, alternating current-direct current reactive power exchange threshold value is set.Once route passes through idle
When more than threshold value, one group of filter group or capacitor group are thrown/cut.Reactive command value is quickly updated in startup stage；In operation rank
Section updates instruction value at relatively slow speeds.
(8) when in reducing under voltage fluctuation mode, a voltage regeneration rate is set as threshold value.It is with current running voltage
Target calculates the reactive power that converter station needs according to the active power of current line transmission.When detecting voltage recovery rate
When more than or equal to threshold value, being switched to reference voltage is to control target to calculate the reactive power that converter station needs, and controls filter
Group and capacitor group switching capacity make poor therewith to reach minimum value.
(9) when needing to put into filter group and capacitor group, according to the priority arrangement of step (5) according to small group # from small
To big investment filter group, capacitor group is finally put into.When needing surgical filtering device group and capacitor group, capacitor is first cut off
Group, according to the reverse-order surgical filtering device group of step (5) after the excision of capacitor group.
(10) controlling unit is divided into and is manually and automatically controlled.Filter group under the idle investment of minimum of converter station is not by manual
Outer with automatically controlling, other valve groups are all controlled by manual with automatic.Locking is manual in a period of time of direct current unlock starting
Control.It automatically controls and switching is carried out according to the control strategy of (4-9 step).
(11) direct current locking backed off after random filter group and capacitor group.When slave station control obtains block signal, link is exited in starting, after
It is continuous to carry out (4-9 step).When detecting voltage to 0, the minimum idle investment of excision.
2. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that access an AC network if it is single layer, then configure a set of idle and filtering control unit；If it is
Two AC networks of layer-specific access then configure two sets of idle and filtering control units.
3. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that active and reactive power value calculates step are as follows: (ABC is arrived by filtering and Park Transformation for voltage, current signal
Dq0 U) is obtainedd、UqAnd Id、Iq, active P=UdId-UqIq, idle Q=UdIq+UqId.It has currently put into idle for the filter of each investment
The sum of wave device group and the rated capacity of capacitor group.
4. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that when DC voltage occurs more than 1.1 per unit value when in manually controlling, controller sounds an alarm prompt
Operations staff carries out the operation of surgical filtering device group or capacitor group, stops when voltage is lower than 1.1 per unit value.
5. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that the minimum idle amount of starting link investment specifically put into one filter group of a set type at 0.1 second,
Two filter group of a set type is put at 0.5 second, this two groups of filter groups by manual/auto control, are not thrown in direct current starting
Enter, is latched backed off after random in direct current.
6. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that when the phase conversion failure judgment module by signal from Converter Station Valve control and pole control is 0, idle control switching
To reduce alternating current-direct current reactive power exchange mode；When being 1, idle control, which is switched to, reduces DC voltage fluctuation mode.Two modes can
It to switch in real time, and is in antagonistic relations.
7. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 6
Method, which is characterized in that reducing reactive power exchange mode: once the idle certain proportion more than power reference value that route passes through
When, throw/cut one group of filter group or capacitor group.Reduce under DC voltage fluctuation mode, sets a voltage regeneration rate threshold
Value.First using current running voltage as target, the reactive power that converter station needs is calculated according to the active power of current line transmission
And switching.When detecting that DC voltage restores voltage regeneration rate threshold value of (rising) speed more than setting, it is switched to base
Quasi- voltage is the reactive power that target calculates that converter station needs, and controlling filter group and capacitor group switching capacity makes poor therewith reach
To minimum value.
8. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 7
Method, which is characterized in that according to:
It obtains inverter and consumes reactive power, in formula: PdcIt is also active power for dc power；QdcIt is consumed for inverter idle
Power；XcFor commutating reactance, it is equivalent to transformer leakage reactance；μ is angle of overlap；φ is converter power factor；IdFor DC current；
E11For converter transformer valve side floating voltage virtual value；α is rectification side Trigger Angle.According to Q=(U/UN)2QNAcquisition has put into filter
Idle, the total reactive power being provided of summing that group and capacitor group provide.
9. a kind of idle control and harmonic wave optimization side suitable for extra-high-voltage direct-current power transmission converter according to claim 1
Method, which is characterized in that cut-off control comprising voltage zero-cross detection and breaker.Its control method is, when control switching biography refers to
It when enabling this powder operation device, is kept for the one cycle time of signal, detects the zero crossing of three-phase alternating voltage, certain phase voltage mistake respectively
When zero, signal is transmitted to the phase breaker and executes switching movement by powder operation device.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233490A (en) * | 2019-07-05 | 2019-09-13 | 重庆城市管理职业学院 | Avoid the direct current transportation fault recovery control method and system of continuous commutation failure |
| CN110336283A (en) * | 2019-07-15 | 2019-10-15 | 国网浙江省电力有限公司电力科学研究院 | The analysis method and system that converter station alternating current filter group influences mains by harmonics |
| CN114039376A (en) * | 2022-01-10 | 2022-02-11 | 国网江西省电力有限公司电力科学研究院 | Control method and device for alternating current bus-tie switch on extra-high voltage direct current transmission layered side |
-
2017
- 2017-08-28 CN CN201710747611.6A patent/CN109428339A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233490A (en) * | 2019-07-05 | 2019-09-13 | 重庆城市管理职业学院 | Avoid the direct current transportation fault recovery control method and system of continuous commutation failure |
| CN110233490B (en) * | 2019-07-05 | 2020-11-10 | 重庆城市管理职业学院 | Direct-current transmission fault recovery control method and system for avoiding continuous commutation failure |
| CN110336283A (en) * | 2019-07-15 | 2019-10-15 | 国网浙江省电力有限公司电力科学研究院 | The analysis method and system that converter station alternating current filter group influences mains by harmonics |
| CN110336283B (en) * | 2019-07-15 | 2020-12-18 | 国网浙江省电力有限公司电力科学研究院 | Method and system for analyzing influence of converter station alternating current filter group on power grid harmonic wave |
| CN114039376A (en) * | 2022-01-10 | 2022-02-11 | 国网江西省电力有限公司电力科学研究院 | Control method and device for alternating current bus-tie switch on extra-high voltage direct current transmission layered side |
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Application publication date: 20190305 |