CN110137999A - A kind of the dc power control method for coordinating and system of the participation of receiving end wind power plant - Google Patents
A kind of the dc power control method for coordinating and system of the participation of receiving end wind power plant Download PDFInfo
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- CN110137999A CN110137999A CN201910449166.4A CN201910449166A CN110137999A CN 110137999 A CN110137999 A CN 110137999A CN 201910449166 A CN201910449166 A CN 201910449166A CN 110137999 A CN110137999 A CN 110137999A
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Classifications
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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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- H02J3/386—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- 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 dc power control method for coordinating and system participated in the invention discloses a kind of receiving end wind power plant, belongs to field of power system control.The present invention is in active power controller strategy, when direct current system transmitting active power changes, can carry out reasonable distribution to the active power of each inverter transmission according to the state of AC system connected to it in inverter side；In Reactive Power Control strategy, in order to reduce voltage fluctuation caused by reactive disturbance, it proposes and adds idle control strategy, by controlling DC transmission system inverter blow-out angle, control the reactive power of its consumption, simultaneously by introducing DC voltage deviation in the control of blower fan control system outer ring d axis constant voltage, the additional control that alternating voltage deviation is introduced in Reactive Power Control is determined in q axis, control each fan rotor d in wind power plant, q shaft current, to control the reactive power of each blower inverter consumption of wind power plant, maintain DC voltage stability, reduce the probability that commutation failure occurs.
Description
Technical field
The invention belongs to field of power system control, the dc power participated in more particularly, to a kind of receiving end wind power plant
Control method for coordinating and system.
Background technique
In recent years, with the continuous development of new energy power generation technology, extra-high voltage direct-current transmission, which becomes, economical to realize electricity
Can large capacity, more mature, the reliable technology transmitted at a distance, help to realize Chinese large-sized Energy Base and photovoltaic, wind
Efficiently utilize to the clean energy resourcies such as electricity.As the extra-high voltage direct-current transmission engineering of more and more drop point east midland power grids builds up throwing
Fortune, east midland receiving end AC system evolve as multi-infeed HVDC access system.It is asked to solve multi-infeed HVDC bring
Topic, domestic scholars propose the access way of extra-high voltage direct-current layer-specific access receiving end power grid from electric network composition.
It is by pole that conventional extra-high voltage direct-current system inverter side generallyd use, which determines gamma kick and constant voltage control,
Control, each inverter of homopolarity use unified triggering command.Under layer-specific access mode, although this press pole control mode
Still it can use, but each inverter transmission power of inverter side can not achieve independent control in this fashion, it also cannot be preferable
Play the advantage that layer-specific access mode guides receiving end AC network trend reasonable layout.
To solve this problem, it needs accordingly to improve extra-high voltage direct-current system convention control strategy.It is domestic at present
Research about ± 1100kV extra-high voltage direct-current control strategy outside, be concentrated mainly on give, receiving end fault in ac transmission system is to alternating current-direct current
Influence of system operating characteristics, and control, protection system deployment scenario and the difference of conventional extra-high voltage direct-current system etc..
Guo Long etc. proposes secondary power-voltage control strategy, and rectification side uses constant dc power control, and inverter side uses secondary power-electricity
Voltage-controlled system, the system two sides of being likely to result in operate in constant dc power control mode, cause not stablizing when system longtime running quiet
State operating point.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to solve need to direct current system transmitting active power into
During row emergent control, blow-out angle nargin is smaller, and the probability that commutation failure occurs increases, and influences AC and DC system and stablizes fortune
Capable and system works as the technical issues of reactive power disturbance causes direct current system voltage disturbance.
To achieve the above object, in a first aspect, the embodiment of the invention provides the direct current function that a kind of receiving end wind power plant participates in
Rate control method for coordinating, method includes the following steps:
S1. judge whether direct current transmission active power changes, if so, obtaining each inverter of inverter side in real time transmits wattful power
Rate, each inverter DC voltage and each inverter blow-out angle, when the active power of transmission needs to change, by inverter side general power
Desired signal passes to rectification side inverter, enters step S2, otherwise, enters step S5；
S2. rectification side converter station changes the active of a step values according to staged after determining target active power
Power；Each inverter of inverter side determines the transmission power instruction of each inverter according to power partition coefficient, and changes according to staged
Become the active power of a step values；
S3. judge that whether at least one inverter blow-out angle is less than or equal to threshold value to inverter side, is down to if so, power is returned
A upper ladder, active power promotion terminate, and enter step S5；Otherwise, it is directly entered S4；
S4. judge whether inverter side converter station reaches target active power, if so, active power promotion terminates, into step
Otherwise rapid S5 enters step S2；
S5. judge whether the DC voltage of at least one inverter disturbs inverter side, if so, by changing simultaneously
Each fan rotor electric current of adjustment is participated in the blow-out angle of the inverter disturbed and wind power plant, so that DC voltage and active
Power keeps stablizing, and after DC voltage restores original value, additional Reactive Power Control terminates, and completes power coordination control,
Otherwise, it is done directly power coordination control；
The extra-high voltage DC transmission system that this method is directed to need to meet simultaneously the following conditions:
1) rectification side AC system is connected with DC converter station by converter power transformer；
2) inverter side accesses AC system in a manner of layer-specific access；
3) inverter side AC system has wind power plant access.
Specifically, the value range of threshold value is [7 °, 12 °].
Specifically, the inverter side inverter blow-out angle disturbed refers to d. c. voltage signal and is given by dispatcher
Reference value it is inconsistent when inverter side inverter blow-out angle.
Specifically, when DC voltage is higher than reference value, increase inverter side inverter blow-out angle；When direct current forces down
When reference value, inverter side inverter blow-out angle is reduced；By the way that it to be compared with direct voltage reference value, pass through ratio product
Sub-controller obtains each inverter and adds each inverter blow-out angle in reactive power/voltage control by proportional integration link
Reference value.
Specifically, receiving end wind electric field blower net side converter Control strategy is divided into outer loop control and inner loop control two parts,
The outer loop control includes: that d axis constant DC voltage control and q axis determine Reactive Power Control and additional control；Wherein,
The control mode that DC voltage is determined using d axis, by the reference value U of DC voltagedc_refWith dc voltage measurements Udc
Make difference and input PI controller more afterwards, obtains the reference value of inner loop control d axis rotor current
To q axis by the way of fixed idle control and additional control, first by the reference of the inverter reactive power of blower
Value Qs_refThe practical reactive power Q of the blower obtained with measurementsMake difference relatively, the company, blower institute in obtained value and additional control
Inverter side ac bus reference value UAC_refWith actual value UACDifference be added after input PI controller, obtain inner loop control q
The reference value of axis rotor currentEnter inner loop control later.
Specifically, in inner loop control, the reference value of d axis rotor currentWith the actual value i of d axis rotor currentdrIt makes the difference
Afterwards, the value obtained enters PI controller, obtains the reference value u ' of inner loop control d axis rotor voltagedr, in addition voltage deviation value Δ
udrAfterwards by clipping controlling unit, the instruction value u of actual d axis rotor voltage is obtaineddr；The reference value of q axis rotor currentWith
The actual value i of q axis rotor currentqrAfter making the difference, obtained value enters PI controller, obtains the ginseng of inner loop control q axis rotor voltage
Examine value u 'qr, in addition voltage deviation value Δ uqrAfterwards by clipping controlling unit, the instruction value of actual q axis rotor voltage is obtained
uqr；
udrAnd uqrAfter being converted by dq-abc, transmit fan inverter, to inverter transmitting reactive power and
Inverter voltage is controlled, the idle power output of the inverter of receiving end wind power plant in the case where reactive disturbance, it is made to participate in balance
System power disturbance.
Second aspect, the embodiment of the invention provides a kind of receiving end wind power plant participate in dc power coordinated control system,
The system comprises:
Power signal acquiring unit, the transmission power for obtaining each inverter of inverter side instruct；
The power transmission instruction that inverter side obtains is transmitted to rectification side by time delay process by delay unit；
Staged power adjustment unit changes according to staged regulative mode in inverter transimission power instruction value
When each inverter actual transmissions active power；
Power partition coefficient determination unit, for determining the power partition coefficient of each inverter of inverter side in real time, in power
Reasonable distribution power regulation in adjustment process；
Secondary power-tuning controller is respectively changed in inverter side using secondary power-voltage control by receiving inverter side
The instruction value and actual value for flowing device transimission power are adjusted by proportional integration and determine voltage in each inverter constant voltage control
Reference value.
Additional reactive power/voltage control device, after collecting inverter side inverter d. c. voltage signal, by by itself and direct current
Pressure reference value is compared, and is adjusted by proportional integration and is determined that each inverter adds each inverter in reactive power/voltage control
The reference value at blow-out angle.
The third aspect, the embodiment of the invention provides a kind of computer readable storage medium, the computer-readable storage mediums
Computer program is stored in matter, which realizes receiving end wind-powered electricity generation described in above-mentioned first aspect when being executed by processor
The dc power control method for coordinating that field participates in.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
Dc power control method for coordinating is divided into two aspects of active and reactive control strategy in the present invention.In active power
In control strategy, when direct current system transmitting active power changes, can be according to exchange connected to it in inverter side
The state of system carries out reasonable distribution to the active power of each inverter transmission.In Reactive Power Control strategy, in order to reduce by
The voltage fluctuation caused by reactive disturbance proposes and adds idle control strategy, is put out by controlling DC transmission system inverter
Arc angle controls the reactive power of its consumption, while by introducing direct current in the control of blower fan control system outer ring d axis constant voltage
Deviation is pressed, the additional control for introducing alternating voltage deviation in Reactive Power Control is determined in q axis, each blower in wind power plant is controlled and turns
Sub- d, q shaft current maintains DC voltage stability to control the reactive power of each blower inverter consumption of wind power plant.To guarantee
Each connected inverter of AC system is able to maintain that biggish blow-out angle nargin, reduces the probability that commutation failure occurs.
Detailed description of the invention
Fig. 1 is the dc power control method for coordinating process that a kind of receiving end wind power plant provided in an embodiment of the present invention participates in
Figure；
Fig. 2 is the extra-high voltage DC transmission system topological structure of inverter side layer-specific access receiving end provided in an embodiment of the present invention
Figure；
Fig. 3 is receiving end wind electric field blower net side converter Control strategy schematic diagram provided in an embodiment of the present invention；
Fig. 4 (a) is the U provided in an embodiment of the present invention using three kinds of different control methodsdc1The curve changed over time
Figure；
Fig. 4 (b) is the U provided in an embodiment of the present invention using three kinds of different control methodsdc2The curve changed over time
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the dc power control method for coordinating that a kind of receiving end wind power plant participates in, this method includes following step
It is rapid:
S1. judge whether direct current transmission active power changes, if so, obtaining each inverter of inverter side in real time transmits wattful power
Rate, each inverter DC voltage and each inverter blow-out angle, when the active power of transmission needs to change, by inverter side general power
Desired signal passes to rectification side inverter, enters step S2, otherwise, enters step S5；
S2. rectification side converter station changes the active of a step values according to staged after determining target active power
Power；Each inverter of inverter side determines the transmission power instruction of each inverter according to power partition coefficient, and changes according to staged
Become the active power of a step values；
S3. judge that whether at least one inverter blow-out angle is less than or equal to threshold value to inverter side, is down to if so, power is returned
A upper ladder, active power promotion terminate, and enter step S5；Otherwise, it is directly entered S4；
S4. judge whether inverter side converter station reaches target active power, if so, active power promotion terminates, into step
Otherwise rapid S5 enters step S2；
S5. judge whether the DC voltage of at least one inverter disturbs inverter side, if so, by changing simultaneously
Each fan rotor electric current of adjustment is participated in the blow-out angle of the inverter disturbed and wind power plant, so that DC voltage and active
Power keeps stablizing, and after DC voltage restores original value, additional Reactive Power Control terminates, and completes power coordination control,
Otherwise, it is done directly power coordination control；
Targeted system need to meet simultaneously the following conditions:
1) rectification side AC system is connected with DC converter station by converter power transformer；
2) inverter side accesses AC system in a manner of layer-specific access；
3) inverter side AC system has wind power plant access.
As shown in Fig. 2, the extra-high voltage DC transmission system of inverter side layer-specific access receiving end includes: rectification side, direct current transmission
Route and inverter side.Wherein, UdcIt indicates the positive DC voltage obtained in inverter side measurement, is equal to positive two inverter direct currents
The sum of voltage, i.e. Udc=Udc1+Udc2.Wind power plant is connected with inverter side AC system 1, and blower inverter is contained in wind power plant.
Rectification side includes: rectification side AC system, alternating current filter, rectification side converter station (comprising four inverters, difference
Be positive high end inverter, positive low side inverter, the high-end inverter of cathode, positive low side inverter).Wherein, ac filter
Device is directly connected with rectification side AC system bus, and rectification side AC system is connected by rectification side converter station and DC power transmission line
It connects.
Direct current transmission route includes: line equivalent resistance RdAnd DC filter.Wherein, DC line directly with it is whole
Stream side is connected with inverter side converter station.
Inverter includes: inverter side AC system 1,2；Inverter side converter station (it include four inverters, it is respectively just high
Hold inverter, positive low side inverter, the high-end inverter of cathode, positive low side inverter), alternating current filter, receiving end wind power plant.
Wherein, wind power plant is connected with inverter side AC system 1 by blower inverter, and wind power plant is made of dozens to hundreds of blower.
Step S1. judges whether direct current transmission active power changes, if so, obtaining each inverter transmission of inverter side in real time has
Function power, each inverter DC voltage and each inverter blow-out angle, it is when the active power of transmission needs to change, inverter side is total
Power demand signal passes to rectification side inverter, enters step S2, otherwise, enters step S5.
The change reason of direct current transmission active power have it is following it is several may: the connect AC system of inverter side change or
Person pseudoinstruction requires to change.Which kind of, regardless of reason direct current transmission active power to be caused to change for, coordinated by dc power
Control, which allows, changes transitions smooth, prevents from being mutated or vibrate.
The inverter transmission power signal of acquisition is after single order time delay process is transferred to rectification side inverter, after entering back into
Continuous step.That is the target active power value of inverter side, which is transmitted to rectification side, certain time-delay.Inverter side general power is equal to each change of current
The sum of device transmitting active power.Inverter side overall power requirement signal is the target active power of rectification side converter station.
Step S2. rectification side converter station changes a step values after determining target active power, according to staged
Active power；Each inverter of inverter side determines the transmission power instruction of each inverter according to power partition coefficient, and according to ladder
Formula changes the active power of a step values.
When inverter transimission power instruction value changes, change the wattful power of each inverter actual transmissions with staged
Rate.
Specifically, change ladder amplitude Δ P in inverter side power ascension or decline order persistence time Δ t is being received,
Transmission power instruction is the sum of direct current basis transmission power and ladder amplitude Δ P, and Δ P value is 0.02 per unit value.
According to the connected AC system equivalent voltage amplitude of each inverter of inverter side and blow-out angle sine value, function is calculated in real time
Rate distribution coefficient.Each inverter of inverter side carries out ladder promotion to power instruction using secondary power-voltage control.Additional function
Rate-voltage control refers to the difference of transmission power signal and the transmission power instruction according to each inverter of inverter side, by ratio
Integral adjustment forms the voltage reference value of the constant voltage control of the inverter.
Step S3. judges whether at least one inverter blow-out angle is less than or equal to threshold value to inverter side, if so, power is returned
It is down to a ladder, active power promotion terminates, and enters step S5；Otherwise, it is directly entered S4.
Engineering thinks that when blow-out angle is lower than 7 °, commutation failure will occur for direct current system in practice.In order to guarantee each change of current
There are certain nargin, the present invention proposes to be lower than threshold alpha with blow-out angle number minimum value in each inverter of inverter side device, as
The converter power stops the criterion being promoted, and α value range is [7 °, 12 °].
If criterion is set up, illustrates that homopolarity series connection a certain converter valve blow-out angle decline is lower, stop power ascension process, and
Power is returned into one ladder of drop.Guarantee that it is biggish abundant that each inverter blow-out angle during power emergency lifting has with this
Degree reduces the probability that commutation failure occurs.
Step S4. judges whether inverter side converter station reaches target active power, if so, active power promotion terminates, into
Enter step S5, otherwise, enters step S2.
Step S5. judges whether the DC voltage of at least one inverter disturbs inverter side, if so, by simultaneously
Each fan rotor electric current of adjustment is participated in the blow-out angle of the inverter disturbed and wind power plant, so that DC voltage and active
Power keeps stablizing, and after DC voltage restores original value, additional Reactive Power Control terminates, and completes power coordination control,
Otherwise, it is done directly power coordination control.
By the inverter side inverter blow-out angle disturbed, thus the reactive power of inverter consumption.Pass through wind power plant
The interior each fan rotor electric current for participating in adjustment, thus the reactive power that wind power plant absorbs.
The inverter side inverter blow-out angle disturbed refers to: if d. c. voltage signal and the ginseng given by dispatcher
It is inconsistent to examine value, inverter side inverter blow-out angle.Specifically, when DC voltage is higher than reference value, increase inverter side and change
Flow device blow-out angle；When DC voltage is lower than reference value, inverter side inverter blow-out angle is reduced.By the way that it is joined with DC voltage
It examines value to be compared, obtains each inverter by proportional integration link by pi controller and add reactive voltage
The reference value at each inverter blow-out angle in control.
As shown in figure 3, receiving end wind electric field blower net side converter Control strategy, is divided into outer loop control and inner loop control two
Point, outer loop control includes: that d axis constant DC voltage control and q axis determine Reactive Power Control and additional control.
In outer loop control, the control mode of DC voltage is determined using d axis, by the reference value U of DC voltagedc_refWith it is straight
Flow voltage measuring value UdcMake difference and input PI controller more afterwards, obtains the reference value of inner loop control d axis rotor currentTo q axis
By the way of surely idle control and additional control, first by the reference value Q of the inverter reactive power of blowers_refWith measure
The practical reactive power Q of the blower arrivedsMake difference relatively, the connected inverter side ac bus of the obtained blower in value and additional control
Reference value UAC_refWith actual value UACDifference be added after input PI controller, obtain the ginseng of inner loop control q axis rotor current
Examine valueEnter inner loop control later.
In inner loop control, the reference value of d axis rotor currentWith the actual value i of d axis rotor currentdrAfter making the difference, obtain
Value enter PI controller, obtain the reference value u ' of inner loop control d axis rotor voltagedr, in addition voltage deviation value Δ udrAfterwards by
Clipping controlling unit obtains the instruction value u of actual d axis rotor voltagedr；The reference value of q axis rotor currentWith q axis rotor
The actual value i of electric currentqrAfter making the difference, obtained value enters PI controller, obtains the reference value u of inner loop control q axis rotor voltage
′qr, in addition voltage deviation value Δ uqrAfterwards by clipping controlling unit, the instruction value u of actual q axis rotor voltage is obtainedqr。
udrAnd uqrAfter being converted by dq-abc, transmit fan inverter, to inverter transmitting reactive power and
Inverter voltage is controlled, the idle power output of the inverter of receiving end wind power plant in the case where reactive disturbance, it is made to participate in balance
System power disturbance.
A kind of dc power coordinated control system that receiving end wind power plant participates in, the system comprises:
Power signal acquiring unit, the transmission power for obtaining each inverter of inverter side instruct；
The power transmission instruction that inverter side obtains is transmitted to rectification side by time delay process by delay unit；
Staged power adjustment unit changes according to staged regulative mode in inverter transimission power instruction value
When each inverter actual transmissions active power；
Power partition coefficient determination unit, for determining the power partition coefficient of each inverter of inverter side in real time, in power
Reasonable distribution power regulation in adjustment process；
Secondary power-tuning controller is respectively changed in inverter side using secondary power-voltage control by receiving inverter side
The instruction value and actual value for flowing device transimission power are adjusted by proportional integration and determine voltage in each inverter constant voltage control
Reference value.
Additional reactive power/voltage control device, after collecting inverter side inverter d. c. voltage signal, by by itself and direct current
Pressure reference value is compared, and is adjusted by proportional integration and is determined that each inverter adds each inverter in reactive power/voltage control
The reference value at blow-out angle.
As shown in Fig. 4 (a), using the U of three kinds of different control methodsdc1Time history plot.Such as Fig. 4 (b) institute
Show, using the U of three kinds of different control methodsdc2Time history plot.As can be seen that joining using receiving end wind single game
With control method after, after whole system is by reactive power disturbance, inverter side anode two inverters DC voltage
Udc1、Udc2The control method that can be soon restored to original value, and be participated in only with inverter side inverter, DC voltage it is extensive
Complex velocity is slower, if not using idle control strategy, after system receives reactive power disturbance, and DC voltage Udc、Udc2No
Method is restored to initial value, thus the validity for the control method that the receiving end wind power plant for demonstrating proposition participates in.It needs to illustrate
It is that specific control effect is directly related with the size that receiving end wind power plant is capable of providing reactive power, receiving end wind power plant can mention
Higher for reactive power, control effect is better.
More than, the only preferable specific embodiment of the application, but the protection scope of the application is not limited thereto, and it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be subject to the protection scope in claims.
Claims (8)
1. the dc power control method for coordinating that a kind of receiving end wind power plant participates in, which is characterized in that method includes the following steps:
S1. judge whether direct current transmission active power changes, if so, each inverter transmitting active power of real-time acquisition inverter side,
Each inverter DC voltage and each inverter blow-out angle need inverter side general power when the active power of transmission needs to change
It asks signal to pass to rectification side inverter, enters step S2, otherwise, enter step S5；
S2. rectification side converter station changes the active power of a step values according to staged after determining target active power；
Each inverter of inverter side determines the transmission power instruction of each inverter according to power partition coefficient, and changes one according to staged
The active power of a step values；
S3. judge that whether at least one inverter blow-out angle is less than or equal to threshold value to inverter side, is down to upper one if so, power is returned
A ladder, active power promotion terminate, and enter step S5；Otherwise, it is directly entered S4；
S4. judge whether inverter side converter station reaches target active power, if so, active power promotion terminates, enter step S5,
Otherwise, S2 is entered step；
S5. judge whether the DC voltage of at least one inverter disturbs inverter side, if so, by changing simultaneously generation
Each fan rotor electric current that adjustment is participated in the blow-out angle of the inverter of disturbance and wind power plant, so that DC voltage and active power
It keeping stablizing, after DC voltage restores original value, additional Reactive Power Control terminates, power coordination control is completed, otherwise,
It is done directly power coordination control；
The extra-high voltage DC transmission system that this method is directed to need to meet simultaneously the following conditions:
1) rectification side AC system is connected with DC converter station by converter power transformer；
2) inverter side accesses AC system in a manner of layer-specific access；
3) inverter side AC system has wind power plant access.
2. the method as described in claim 1, which is characterized in that the value range of threshold value is [7 °, 12 °].
3. the method as described in claim 1, which is characterized in that the inverter side inverter blow-out angle disturbed refers to directly
Inverter side inverter blow-out angle when stream voltage signal and the inconsistent reference value given by dispatcher.
4. method as described in any one of claims 1 to 3, which is characterized in that when DC voltage is higher than reference value, increase
Big inverter side inverter blow-out angle；When DC voltage is lower than reference value, inverter side inverter blow-out angle is reduced；By by its with
Direct voltage reference value is compared, and it is attached to obtain each inverter by proportional integration link by pi controller
Add the reference value at each inverter blow-out angle in reactive power/voltage control.
5. method as described in any one of claims 1 to 3, which is characterized in that receiving end wind electric field blower net side converter Control
Strategy, is divided into outer loop control and inner loop control two parts, and the outer loop control includes: that d axis constant DC voltage control and q axis determine nothing
Function power control and additional control；Wherein,
The control mode that DC voltage is determined using d axis, by the reference value U of DC voltagedc_refWith dc voltage measurements UdcIt is poor to make
PI controller is inputted more afterwards, obtains the reference value of inner loop control d axis rotor current
To q axis by the way of fixed idle control and additional control, first by the reference value of the inverter reactive power of blower
Qs_refThe practical reactive power Q of the blower obtained with measurementsMake difference relatively, the company, blower institute in obtained value and additional control is inverse
Become side ac bus reference value UAC_refWith actual value UACDifference be added after input PI controller, obtain inner loop control q axis
The reference value of rotor currentEnter inner loop control later.
6. method as claimed in claim 5, which is characterized in that in inner loop control, the reference value of d axis rotor currentAnd d
The actual value i of axis rotor currentdrAfter making the difference, obtained value enters PI controller, obtains the reference of inner loop control d axis rotor voltage
Value u 'dr, in addition voltage deviation value Δ udrAfterwards by clipping controlling unit, the instruction value u of actual d axis rotor voltage is obtaineddr；q
The reference value of axis rotor currentWith the actual value i of q axis rotor currentqrAfter making the difference, obtained value enters PI controller, obtains
The reference value u ' of inner loop control q axis rotor voltageqr, in addition voltage deviation value Δ uqrAfterwards by clipping controlling unit, reality is obtained
Q axis rotor voltage instruction value uqr；
udrAnd uqrAfter converting by dq-abc, fan inverter is transmitted, to the reactive power and the change of current of inverter transmitting
Device voltage is controlled, the idle power output of the inverter of receiving end wind power plant in the case where reactive disturbance, it is made to participate in balance system
Power disturbance.
7. the dc power coordinated control system that a kind of receiving end wind power plant participates in, which is characterized in that the system comprises:
Power signal acquiring unit, the transmission power for obtaining each inverter of inverter side instruct；
The power transmission instruction that inverter side obtains is transmitted to rectification side by time delay process by delay unit；
Staged power adjustment unit, it is each when inverter transimission power instruction value changes according to staged regulative mode
The active power of inverter actual transmissions；
Power partition coefficient determination unit, for determining the power partition coefficient of each inverter of inverter side in real time, in power regulation
Reasonable distribution power regulation in the process；
Secondary power-tuning controller, in inverter side using secondary power-voltage control, by receiving each inverter of inverter side
The instruction value and actual value of transimission power adjust the ginseng for determining voltage in each inverter constant voltage control by proportional integration
Examine value.
Additional reactive power/voltage control device, after collecting inverter side inverter d. c. voltage signal, by joining it with DC voltage
It examines value to be compared, is adjusted by proportional integration and determine that each inverter adds each inverter blow-out in reactive power/voltage control
The reference value at angle.
8. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program realizes that receiving end wind power plant as claimed in any one of claims 1 to 6 such as participates in when the computer program is executed by processor
Dc power control method for coordinating.
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