CN107565591B - Control method and control device for preventing direct current power from reversing - Google Patents
Control method and control device for preventing direct current power from reversing Download PDFInfo
- Publication number
- CN107565591B CN107565591B CN201710874867.3A CN201710874867A CN107565591B CN 107565591 B CN107565591 B CN 107565591B CN 201710874867 A CN201710874867 A CN 201710874867A CN 107565591 B CN107565591 B CN 107565591B
- Authority
- CN
- China
- Prior art keywords
- voltage
- value
- converter station
- side converter
- control system
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000002159 abnormal effect Effects 0.000 claims abstract description 40
- 230000006835 compression Effects 0.000 claims description 36
- 238000007906 compression Methods 0.000 claims description 36
- 238000005259 measurement Methods 0.000 claims description 14
- 238000013481 data capture Methods 0.000 claims description 7
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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]
Landscapes
- Inverter Devices (AREA)
Abstract
The invention provides a control method and a control device for preventing direct current power inversion, relates to the technical field of power transmission and distribution, and can solve the problem of direct current power inversion caused by abnormal high direct current voltage measured values. The control method comprises the following steps: judging whether the measured value of the direct-current voltage of the converter station at the rectifying side is abnormally high relative to the actual value in real time, and switching a direct-current control system if the measured value of the direct-current voltage of the converter station at the rectifying side is abnormally high relative to the actual value; and judging whether the measured value of the direct-current voltage of the rectifying side converter station after the direct-current control system is switched is abnormally high relative to the actual value, if so, acquiring an auxiliary direct-current voltage loop parameter of the inverting side converter station, starting the inverting side auxiliary direct-current voltage control, and outputting and limiting the direct-current voltage of the inverting side converter station according to the acquired auxiliary direct-current voltage loop parameter. The control method is applied to the flexible direct-current power transmission system based on the voltage source converter.
Description
Technical field
The present invention relates to transmission & distribution electro-technical field more particularly to a kind of control methods and control for preventing dc power from inverting
Device.
Background technique
With the quick hair of voltage source converter (full name in English: Voltage Source Converter, abbreviation VSC)
Exhibition, the flexible HVDC transmission system (full name in English: Voltage Source Converter based based on voltage source converter
High Voltage Direct Current, abbreviation VSC-HVDC) become HVDC Transmission Technology main trend.VSC-HVDC
Can independent control active power and reactive power, realize energy in bidirectional flow, have be not necessarily to commutation voltage, adjust node electricity
The advantages that pressure, electric power grid frequency stabilization, control system trend is isolated electric network fault, improves power grid quality.
In the control system of VSC-HVDC, basic control mode is determined by outer ring controller, and outer ring controller includes straight
The voltage-controlled system of galvanic electricity, power closed-loop control etc. are control target with DC voltage, DC side active power.Wherein DC voltage
Control can realize the adjusting for the active power that each converter station flows through by adjusting the size of DC voltage.The control of DC voltage
Strategy mainly has: master & slave control, voltage margin control and the sagging control of voltage.Voltage margin control does not depend on top level control system
System does not need to communicate between high speed is stood and coordinate, and when the rectification side converter station for controlling DC voltage exits, inverter side converter station can
Automatic smoothing is switched to auxiliary vertical compression control.
However when the measured value that DC voltage occurs in rectification side converter station is extremely higher, the measured value of the station DC voltage
The rated value of DC voltage is maintained always, and the actual value of DC voltage is consistently less than rated value.Inverter side is changed simultaneously
The actual value of stream station DC voltage is also below rated value, when the actual value of inverter side converter station DC voltage reaches lower than 0.9 times
When the threshold of rated value, inverter side converter station will start auxiliary vertical compression control, export positive adjustment amount, and adjustment increases inverter side and changes
The DC voltage at station is flowed, this actual value that will lead to the DC voltage of inverter side converter station auxiliary vertical compression control is higher than rectification side
The actual value of converter station DC voltage, so as to cause dc power reversion.
In the prior art, the control method of the control system of VSC-HVDC can not prevent the measured value of DC voltage extremely inclined
The problem of dc power caused by height inverts.
Summary of the invention
For above-mentioned the problems of the prior art, the present invention provides a kind of control method and control for preventing dc power from inverting
Device processed, with solve the measured value of DC voltage it is extremely higher caused by the auxiliary vertical compression control of inverter side converter station it is straight
Galvanic electricity is compacted the problem of actual value is higher than rectification side converter station DC voltage actual value, and dc power caused by effectivelying prevent thus is anti-
Turn phenomenon.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
The first aspect of the present invention provides a kind of control method for preventing dc power from inverting, and the control method includes
Following steps:
S1: whether the measured value of real-time judge rectification side converter station DC voltage is abnormal higher relative to actual value, if it is not,
Then terminate this process；If so, switching DC control system, and enter step S2；
S2: judge switch DC control system after rectification side converter station DC voltage measured value relative to actual value whether
Still abnormal higher, if it is not, then terminating this process；If so, entering step S3；
S3: the auxiliary vertical compression ring parameter of inverter side converter station, starting inverter side auxiliary vertical compression control, according to acquired are obtained
Auxiliary vertical compression ring parameter output violent change is carried out to the DC voltage of inverter side converter station.
In the control method provided by the present invention for preventing dc power from inverting, real-time judge rectification side converter station direct current
Whether the measured value of voltage is abnormal higher relative to actual value, once determine that the measured value of rectification side converter station DC voltage is opposite
It is extremely higher in actual value, illustrate that currently running DC control system has DC voltage measurement input exception, then
Switch DC control system, i.e., currently running DC control system is switched to DC control system on duty, by current value
The DC control system of class is switched to the DC control system of operation.After switching DC control system, rectification side is changed again
The measured value of stream station DC voltage relative to actual value it is whether abnormal it is higher judged, if rectification side converter station DC voltage
Measured value is still abnormal higher relative to actual value, and it is defeated that the DC control system after illustrating switching still has DC voltage measurement
Enter abnormal problem, then obtains the auxiliary vertical compression ring parameter of inverter side converter station, starting inverter side auxiliary vertical compression control, according to institute
The auxiliary vertical compression ring parameter of acquisition carries out output violent change to the DC voltage of inverter side converter station, controls inverter side converter station direct current
The actual value of voltage is not higher than the actual value of rectification side converter station DC voltage, stands erectly to effectively prevent the inverter side change of current
The actual value of galvanic electricity pressure is higher than the problem of reversion of dc power caused by the actual value of rectification side converter station DC voltage, improves
The operational reliability of VSC-HVDC.
The second aspect of the present invention provides a kind of control device for preventing dc power from inverting, the control device packet
Include: judgment module, the judgment module are used for the measured value of real-time judge rectification side converter station DC voltage relative to actual value
It is whether abnormal higher.The control module being connected with the judgment module, the control module are used in rectification side converter station direct current
When the measured value of voltage is extremely higher relative to actual value, DC control system is switched over.The judgment module is also used to
After DC control system switching, judge whether the measured value of rectification side converter station DC voltage is still abnormal relative to actual value
It is higher.The control module is also used to after DC control system switches, and the measured value of rectification side converter station DC voltage is opposite
When actual value is still abnormal higher, the auxiliary vertical compression ring parameter of inverter side converter station is obtained, starting inverter side assists vertical compression control
System carries out output violent change according to DC voltage of the acquired auxiliary vertical compression ring parameter to inverter side converter station.
The beneficial effect and the present invention for the control device for preventing dc power from inverting provided by the second aspect of the present invention
First aspect provided by prevent dc power invert control method beneficial effect it is identical, details are not described herein again.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow chart one for the control method for preventing dc power from inverting provided by the embodiment of the present invention；
Fig. 2 is the flowchart 2 for the control method for preventing dc power from inverting provided by the embodiment of the present invention；
Fig. 3 is the structural schematic diagram for the control device for preventing dc power from inverting provided by the embodiment of the present invention.
Description of symbols:
1- judgment module；11- data capture unit；
12- data processing unit；13- compares to determine unit；
2- control module；3- parameter calculating module.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel all other embodiment obtained without creative labor belongs to the model that the present invention protects
It encloses.
Embodiment one
The present embodiment is by taking back-to-back flexible HVDC transmission system as an example, to the provided control for preventing dc power from inverting
Method is illustrated, and in back-to-back flexible HVDC transmission system, sending end (i.e. rectification side) is control direct current pressure side, receiving end
(i.e. inverter side) is control power end, and DC voltage control strategy is controlled using voltage margin.
As depicted in figs. 1 and 2, the control method for preventing dc power from inverting provided by the present embodiment includes following step
It is rapid:
S1: whether the measured value of real-time judge rectification side converter station DC voltage is abnormal higher relative to actual value, if it is not,
Then terminate this process；If so, switching DC control system, and enter step S2.
In above-mentioned steps S1, it can be surveyed by comparing two stations (i.e. rectification side converter station and inverter side converter station) DC voltage
The difference of magnitude and the size of certain limit, come judge the measured value of rectification side converter station DC voltage relative to actual value whether
It is abnormal higher.Specifically, step S1 the following steps are included:
S11: the measured value and inverter side converter station anode and negative of rectification side converter station positive electrode and negative electrode DC voltage are obtained
The measured value of pole DC voltage.
It should be noted that if rectification side measurement input is normal, the measured value of rectification side converter station DC voltage
It is consistent with actual value；If rectification side measurement inputs abnormal higher, the measured value of rectification side converter station DC voltage
It is less than actual value.And since inverter side measurement input is normal, the measured value of inverter side converter station DC voltage with
Actual value is consistent.
S12: the deviation U of rectification side converter station anode and inverter side converter station positive DC voltage measuring value is calculated+, and
The deviation U of rectification side converter station cathode and inverter side converter station negative DC voltage measuring value-。
S13: compare U+Absolute value | U+| with setting valve U0Size, U-Absolute value | U-| with setting valve U0Size,
U+Size and U with 0-With 0 size.
It should be noted that setting valve U0It is determined according to the rated value of direct current system DC voltage, the present embodiment is simultaneously unlimited
Its fixed specific value.Setting valve U can preferably be made0Equal to 0.1 times of the rated value of direct current system DC voltage, such as: for
Voltage class is the direct current system of 300kV, can be by setting valveIt is set as 30kV.In addition, for long range DC transmission system,
In setting setting valve U0When need to consider the influence of line drop.
S14: note condition one are as follows: | U+|>U0And U+> 0, condition two are as follows: | U-|>U0And U-< 0, if in condition one and condition two
At least meet a condition, then determine that the measured value of rectification side converter station DC voltage is extremely higher relative to actual value, switches
DC control system, and enter step S2.Otherwise, it is determined that the measured value of rectification side converter station DC voltage relative to actual value not
It is abnormal higher, terminate this process.
It should be noted that under normal circumstances, due to the measured value and actual value of rectification side and inverter side DC voltage
It is consistent, therefore | U+| and | U-| (it should be less than or equal to U within a certain range0).When measurement input exception occurs in rectification side
Higher problem, and measured value is still shown when being consistent with rated value, illustrate the actual value of rectification side DC voltage already below
Rated value, and what the measured value of inverter side DC voltage then reacted is actual value, therefore the measured value of inverter side DC voltage is low
In rated value, at this moment | U+| and | U-| (it will be greater than U beyond the range0), and U+It should be a positive value, U-It should be negative for one
Value, therefore by comparing | U+|、|U-| with U0Size, and compare U+、U-Size with 0, can judge that the rectification side change of current is stood erectly
Whether the measured value of galvanic electricity pressure is abnormal higher relative to actual value.
By analysis above it is found that the measured value when rectification side converter station DC voltage is extremely higher relative to actual value
When, illustrate the actual value of rectification side converter station DC voltage lower than rated value, currently running DC control system has measurement
Input abnormal problem.Since DC control system is redundancy, there are two sets of DC control systems, under normal conditions a set of direct current
Control system operation, another set of DC control system is on duty, therefore in step S14, by switching DC control system, will work as
The DC control system of preceding operation is switched to DC control system on duty, and current DC control system on duty is switched to fortune
Capable DC control system can eliminate the inverter side change of current if the DC control system measurement input switched is normal
The problem of dc power caused by actual value of the actual value higher than rectification side converter station DC voltage of DC voltage of standing inverts.
In the present embodiment, so-called " terminating this process " refer to complete once prevent dc power invert control into
Journey.It relative to the whether abnormal higher judgement of actual value is in real time, therefore to the measured value of rectification side converter station DC voltage
After " terminating this process ", the judgement of subsequent time, the control for being prevented dc power from inverting next time can be carried out automatically
Process.
S2: judge switch DC control system after rectification side converter station DC voltage measured value relative to actual value whether
Still abnormal higher, if it is not, then terminating this process；If so, entering step S3；
In above-mentioned steps S2, " the measured value phase of rectification side converter station DC voltage after judgement switching DC control system
It is whether still abnormal higher for actual value " method can refer to above-mentioned steps S11~S14.Specifically, step S2 includes following
Step:
S21: the measured value of rectification side converter station positive electrode and negative electrode DC voltage and inverse is obtained after switching DC control system
Become the measured value of side converter station positive electrode and negative electrode DC voltage.
S22: rectification side converter station anode and inverter side converter station positive DC voltage after switching DC control system are calculated
The deviation U of measured value+And the deviation U of rectification side converter station cathode and inverter side converter station negative DC voltage measuring value-。
S23: compare U+Absolute value | U+| with setting valve U0Size, U-Absolute value | U-| with setting valve U0Size,
U+Size and U with 0-With 0 size.
S24: note condition one are as follows: | U+|>U0And U+> 0, condition two are as follows: | U-|>U0And U-< 0, if in condition one and condition two
At least meet a condition, then determine switch DC control system after rectification side converter station DC voltage measured value relative to reality
Actual value is still abnormal higher, enters step S3.Otherwise, it is determined that the measured value of rectification side converter station DC voltage is relative to actual value
It is not abnormal higher, terminate this process.
If S21~S24 through the above steps, rectification side converter station DC voltage after switching DC control system is determined
Measured value is still abnormal higher relative to actual value, then illustrates the actual value of rectification side converter station DC voltage still above specified
The measurement input of value, currently running DC control system is also exception, needs to carry out step S3, to prevent inverter side from assisting
After vertical compression control starting, the actual value of inverter side converter station DC voltage is higher than the actual value of rectification side converter station DC voltage.
S3: the auxiliary vertical compression ring parameter of inverter side converter station, starting inverter side auxiliary vertical compression control, according to acquired are obtained
Auxiliary vertical compression ring parameter output violent change is carried out to the DC voltage of inverter side converter station.
In above-mentioned steps S3, the auxiliary vertical compression ring parameter of acquired inverter side converter station can obtain by the following method
It arrives.Specifically, in step s 2, if it is determined that the measured value of rectification side converter station DC voltage is still abnormal inclined relative to actual value
Height, further comprising the steps of before entering step S3:
(1) calculates boost voltage ring and exports maximum parameter I according to the following formulaPmax:
IPmax=Pmin÷Ub (1)
Wherein, PminThe counter of converter valve, which is allowed flow into, for inverter side send active power minimum value, PminTake positive value, PminIt is exhausted
Preferably it is equal to 0.1 times of direct current system power-handling capability to value.UbFor the rated value of converter valve side DC voltage.
(2) calculate boost voltage ring and export minimum parameter I according to the following formulaPmin:
IPmin=Pmax÷Ub (2)
Wherein, PmaxAllow to flow out AC system for inverter side and just send active power maximum value, PmaxTake negative value, Pmax's
Absolute value is preferably equal to 1.1 times of direct current system power-handling capability.UbFor the rated value of converter valve side DC voltage.
Boost voltage ring is obtained through the above steps exports maximum parameter and minimum parameter to get boost voltage ring ginseng has been arrived
Several value ranges carries out output limit to the DC voltage of inverter side converter station so as to the reasonable value in the value range
Width, the actual value of the DC voltage of control inverter side auxiliary vertical compression control, makes the actual value of inverter side converter station DC voltage not
Higher than the actual value of rectification side converter station DC voltage.
In the control method for preventing provided by the present embodiment dc power from inverting, the real-time judge rectification side change of current is stood erectly
Whether the measured value of galvanic electricity pressure is abnormal higher relative to actual value, once determine the measured value phase of rectification side converter station DC voltage
It is extremely higher for actual value, illustrate that currently running DC control system has DC voltage measurement input exception,
Then switch DC control system.After switching DC control system, again to the measured value phase of rectification side converter station DC voltage
It is whether abnormal for actual value it is higher judge, if the measured value of rectification side converter station DC voltage relative to actual value still
Abnormal higher, the DC control system after illustrating switching still has the abnormal problem of DC voltage measurement input, then obtains inverse
Become the auxiliary vertical compression ring parameter of side converter station, starting inverter side auxiliary vertical compression control, according to acquired auxiliary vertical compression ring parameter
Output violent change is carried out to the DC voltage of inverter side converter station, the actual value of control inverter side converter station DC voltage is not higher than whole
The actual value of side converter station DC voltage is flowed, to effectively prevent the actual value of inverter side converter station DC voltage higher than whole
The problem of flowing the reversion of dc power caused by the actual value of side converter station DC voltage, improves the reliable for operation of VSC-HVDC
Property.
Embodiment two
A kind of control device for preventing dc power from inverting is present embodiments provided, as shown in figure 3, the control device includes
The judgment module 1 and control module 2 being connected.Wherein, judgment module 1 is for real-time judge rectification side converter station DC voltage
Whether measured value is abnormal higher relative to actual value.Control module 2 is used for the measured value phase in rectification side converter station DC voltage
When extremely higher for actual value, DC control system is switched over.Moreover, it is judged that module 1 is also used in DC control system
After system switching, judge whether the measured value of rectification side converter station DC voltage is still abnormal higher relative to actual value.Control mould
Block 2 is also used to after DC control system switches, and the measured value of rectification side converter station DC voltage is still different relative to actual value
When often higher, the auxiliary vertical compression ring parameter of inverter side converter station, starting inverter side auxiliary vertical compression control, according to acquired are obtained
Vertical compression ring parameter is assisted to carry out output violent change to the DC voltage of inverter side converter station.
The control device for preventing dc power from inverting in the present embodiment is applied to prevent dc power in embodiment one
In the control method of reversion, the actual value that can be effectively prevented inverter side converter station DC voltage is higher than the rectification side change of current and stands erectly
The problem of dc power caused by the actual value of galvanic electricity pressure inverts, improves the operational reliability of VSC-HVDC.
As a preferred option, judgment module 1 specifically includes data capture unit 11, the data processing unit being sequentially connected
12 and compare to determine unit 13.Wherein, data capture unit 11 is for obtaining rectification side converter station positive electrode and negative electrode DC voltage
Measured value and inverter side converter station positive electrode and negative electrode DC voltage measured value.Data processing unit 12 is for calculating rectification
The deviation U of side converter station anode and inverter side converter station positive DC voltage measuring value+And rectification side converter station cathode with it is inverse
Become the deviation U of side converter station negative DC voltage measuring value-.Unit 13 is compared to determine for comparing U+Absolute value | U+| with
Setting valve U0Size, U-Absolute value | U-| with setting valve U0Size, U+Size and U with 0-With 0 size: note condition
One are as follows: | U+|>U0And U+> 0, condition two are as follows: | U-|>U0And U-< 0, if at least meeting a condition in condition one and condition two,
Determine that the measured value of rectification side converter station DC voltage is extremely higher relative to actual value；Otherwise, it is determined that the rectification side change of current is stood erectly
The measured value of galvanic electricity pressure is not abnormal higher relative to actual value.Wherein, the setting valve U0According to direct current system DC voltage
Rated value determines.
Using data capture unit 11, data processing unit 12 and compares to determine unit 13 and can be realized rectification side is changed
The measured value of stream station DC voltage is relative to the whether abnormal higher judgement of actual value, so that it is determined that the reality of rectification side DC voltage
Whether actual value is lower than rated value, and whether the measurement input of currently running DC control system is abnormal.
As a preferred option, the control device for preventing dc power from inverting in the present embodiment further includes and control module
2 connected parameter calculating modules 3, the parameter calculating module 3 are used for according to formula (1): IPmax=Pmin÷Ub, calculate boost voltage
Ring exports maximum parameter IPmax, and according to formula (2): IPmin=Pmax÷Ub, calculate boost voltage ring and export minimum parameter IPmin。
Wherein, PminThe counter of converter valve, which is allowed flow into, for inverter side send active power minimum value, PminTake positive value；PmaxFor inverter side permission
Outflow AC system just send active power maximum value, PmaxTake negative value；UbFor the rated value of converter valve side DC voltage.
The maximum parameter of boost voltage ring output and minimum parameter can be calculated by parameter calculating module 3 to get arriving
The value range of boost voltage ring parameter, so that control module 2 can reasonable value, the acquisition inverter side change of current in the value range
The auxiliary vertical compression ring parameter stood realizes the output violent change to the DC voltage of inverter side converter station.
The foregoing is merely a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
It is quasi-.
Claims (8)
1. it is a kind of prevent dc power invert control method, which is characterized in that the control method the following steps are included:
S1: whether the measured value of real-time judge rectification side converter station DC voltage is abnormal higher relative to actual value, if it is not, then tying
Shu Benci process；If so, switching DC control system, and S2 is entered step, the switching DC control system refers to will be current
The DC control system of operation is switched to DC control system on duty, and current DC control system on duty is switched to operation
DC control system；
S2: judge switch DC control system after rectification side converter station DC voltage measured value relative to actual value whether still
It is abnormal higher, if it is not, then terminating this process；If so, entering step S3；
S3: the auxiliary vertical compression ring parameter of inverter side converter station, starting inverter side auxiliary vertical compression control, according to acquired auxiliary are obtained
Vertical compression ring parameter is helped to carry out output violent change to the DC voltage of inverter side converter station.
2. the control method of dc power reversion according to claim 1, which is characterized in that in step S1 and step S2
In, judge the measured value of rectification side converter station DC voltage it is whether abnormal higher relative to actual value the following steps are included:
Obtain the measured value and inverter side converter station positive electrode and negative electrode direct current of rectification side converter station positive electrode and negative electrode DC voltage
The measured value of pressure；
Calculate the deviation U of rectification side converter station anode and inverter side converter station positive DC voltage measuring value+And rectification side is changed
The deviation U of stream station cathode and inverter side converter station negative DC voltage measuring value-；
Compare U+Absolute value | U+| with setting valve U0Size, U-Absolute value | U-| with setting valve U0Size, U+With 0 it is big
Small and U-With 0 size；Wherein, the setting valve U0It is determined according to the rated value of direct current system DC voltage；
Note condition one are as follows: | U+|>U0And U+> 0, condition two are as follows: | U-|>U0And U-< 0, if at least meeting in condition one and condition two
One condition then determines that the measured value of rectification side converter station DC voltage is extremely higher relative to actual value；Otherwise, it is determined that rectification
The measured value of side converter station DC voltage is not abnormal higher relative to actual value.
3. the control method according to claim 2 for preventing dc power from inverting, which is characterized in that the setting valve U0Deng
In 0.1 times of the rated value of direct current system DC voltage.
4. the control method according to claim 1 for preventing dc power from inverting, which is characterized in that in step s 2, if
Determine that the measured value of rectification side converter station DC voltage is extremely higher relative to actual value, before entering step S3, further includes
Following steps:
(1) calculates auxiliary vertical compression ring and exports maximum parameter I according to the following formulaPmax:
IPmax=Pmin÷Ub (1)
Wherein, PminThe counter of converter valve, which is allowed flow into, for inverter side send active power minimum value, PminTake positive value；UbFor converter valve
The rated value of side DC voltage；
(2) calculate auxiliary vertical compression ring and export minimum parameter I according to the following formulaPmin:
IPmin=Pmax÷Ub (2)
Wherein, PmaxAllow to flow out AC system for inverter side and just send active power maximum value, PmaxTake negative value；UbFor converter valve
The rated value of valve side DC voltage.
5. the control method according to claim 4 for preventing dc power from inverting, which is characterized in that PminAbsolute value etc.
In 0.1 times of direct current system power-handling capability；PmaxAbsolute value be equal to 1.1 times of direct current system power-handling capability.
6. a kind of control device for preventing dc power from inverting, which is characterized in that the control device includes:
Judgment module, the judgment module are used for the measured value of real-time judge rectification side converter station DC voltage relative to actual value
It is whether abnormal higher；
The control module being connected with the judgment module, the control module are used for the measurement in rectification side converter station DC voltage
When being worth extremely higher relative to actual value, DC control system is switched over, it is described that finger is switched over to DC control system
Currently running DC control system is switched to DC control system on duty, current DC control system on duty is switched
For the DC control system of operation；
The judgment module is also used to after DC control system switches, and judges the measured value phase of rectification side converter station DC voltage
It is whether still abnormal higher for actual value；
The control module is also used to after DC control system switches, the measured value of rectification side converter station DC voltage relative to
When actual value is still abnormal higher, the auxiliary vertical compression ring parameter of inverter side converter station is obtained, starting inverter side auxiliary vertical compression controls,
Output violent change is carried out according to DC voltage of the acquired auxiliary vertical compression ring parameter to inverter side converter station.
7. the control device according to claim 6 for preventing dc power from inverting, which is characterized in that the judgment module packet
It includes:
Data capture unit, the data capture unit are used to obtain the measurement of rectification side converter station positive electrode and negative electrode DC voltage
The measured value of value and inverter side converter station positive electrode and negative electrode DC voltage；
The data processing unit being connected with the data capture unit, the data processing unit is for calculating rectification side converter station
The deviation U of anode and inverter side converter station positive DC voltage measuring value+And rectification side converter station cathode and the inverter side change of current
Stand the deviation U of negative DC voltage measuring value-；
What is be connected with the data processing unit compares to determine unit, and the unit that compares to determine is for comparing U+Absolute value | U+
| with setting valve U0Size, U-Absolute value | U-| with setting valve U0Size, U+Size and U with 0-With 0 size；Remember item
Part one are as follows: | U+|>U0And U+> 0, condition two are as follows: | U-|>U0And U-< 0, if at least meeting a condition in condition one and condition two,
Then determine that the measured value of rectification side converter station DC voltage is extremely higher relative to actual value；Otherwise, it is determined that rectification side converter station
The measured value of DC voltage is not abnormal higher relative to actual value；Wherein, the setting valve U0According to direct current system DC voltage
Rated value determine.
8. the control device according to claim 6 for preventing dc power from inverting, which is characterized in that the control device is also
It include: the parameter calculating module being connected with the control module, the parameter calculating module is calculated for (1) according to the following formula
Vertical compression ring is assisted to export maximum parameter IPmax:
IPmax=Pmin÷Ub (1)
Wherein, PminThe counter of converter valve, which is allowed flow into, for inverter side send active power minimum value, PminTake positive value；UbFor converter valve
The rated value of side DC voltage；
The parameter calculating module is also used to calculate auxiliary vertical compression ring output minimum parameter I according to the following formula (2)Pmin:
IPmin=Pmax÷Ub (2)
Wherein, PmaxAllow to flow out AC system for inverter side and just send active power maximum value, PmaxTake negative value；UbFor converter valve
The rated value of valve side DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710874867.3A CN107565591B (en) | 2017-09-25 | 2017-09-25 | Control method and control device for preventing direct current power from reversing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710874867.3A CN107565591B (en) | 2017-09-25 | 2017-09-25 | Control method and control device for preventing direct current power from reversing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107565591A CN107565591A (en) | 2018-01-09 |
| CN107565591B true CN107565591B (en) | 2019-11-29 |
Family
ID=60981597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710874867.3A Active CN107565591B (en) | 2017-09-25 | 2017-09-25 | Control method and control device for preventing direct current power from reversing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107565591B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418239B (en) * | 2018-04-26 | 2021-02-02 | 南方电网科学研究院有限责任公司 | Power control method and device for flexible direct current transmission system |
| CN110456131B (en) * | 2019-07-25 | 2021-06-22 | 南方电网科学研究院有限责任公司 | Method, device and equipment for positioning direct-current voltage measurement abnormity |
| CN114200196B (en) * | 2021-12-13 | 2024-07-12 | 南方电网科学研究院有限责任公司 | DC voltage measurement abnormality detection method for flexible DC back-to-back system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471566A (en) * | 2007-12-24 | 2009-07-01 | 国网直流工程建设有限公司 | Method for calculating major loop parameter of back-to-back DC system |
| CN103296672A (en) * | 2013-02-20 | 2013-09-11 | 中国电力科学研究院 | Method for restraining high direct current voltage after direct current line fault in voltage-reduction restarting mode |
| KR20150118621A (en) * | 2014-04-14 | 2015-10-23 | 엘에스산전 주식회사 | Hvdc system and operating method thereof |
-
2017
- 2017-09-25 CN CN201710874867.3A patent/CN107565591B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471566A (en) * | 2007-12-24 | 2009-07-01 | 国网直流工程建设有限公司 | Method for calculating major loop parameter of back-to-back DC system |
| CN103296672A (en) * | 2013-02-20 | 2013-09-11 | 中国电力科学研究院 | Method for restraining high direct current voltage after direct current line fault in voltage-reduction restarting mode |
| KR20150118621A (en) * | 2014-04-14 | 2015-10-23 | 엘에스산전 주식회사 | Hvdc system and operating method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 逆变侧送极控主***直流电压测量结_省略_测量值异常时提高***可靠性的建议;朱韬析等;《南方电网技术》;20080831;第2卷(第4期);第63-67页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107565591A (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107769241B (en) | Voltage and current control method and device for direct current transmission system | |
| CN105826943B (en) | A kind of collecting and distributing type inversion system and its starting method | |
| CN107565591B (en) | Control method and control device for preventing direct current power from reversing | |
| EP3211743A1 (en) | Island-to-network switching method | |
| CN106026195B (en) | Control method for synchronous closing and grid connection of micro-grid group | |
| CN106471695A (en) | The method of black starting-up blower fan, wind energy turbine set and recovery wind energy turbine set and blower fan, and the blower fan using the method, wind energy turbine set | |
| CN110061529B (en) | Smooth switching control method of flexible multi-state switch | |
| CN105406719A (en) | Device applied to paralleled current sharing of programmable DC power module and paralleled current sharing method thereof | |
| CN104362665A (en) | Microgrid on-grid to off-grid switching control system and control method thereof | |
| CN103066615A (en) | Starting method for flexible direct current transmission system | |
| CN103244397A (en) | Optimal operation control method for variable-frequency circulating water pump | |
| CN104467016B (en) | A kind of five level photovoltaic inverter precharge control methods and system | |
| CN109755953A (en) | A kind of AC/DC Power System steady state voltage cooperative control method that phase modifier participates in | |
| CN109888827A (en) | Photovoltaic combining inverter power limitation method, device, controller and inverter | |
| CN103618308A (en) | Alternating current line power flow automatic control method of alternating current and flexible direct current parallel power transmission system | |
| JP2017184607A (en) | Power distribution system and power combination circuit | |
| CN108321832A (en) | Control method and control device for reducing equipment overcurrent operation risk | |
| CN107482667B (en) | Control method and control device for preventing equipment from being over-pressurized | |
| CN112731014A (en) | Island detection method and device for direct-current interconnected power distribution system | |
| CN105703402A (en) | Micro-grid system and operation control method of micro-grid system | |
| CN103633659A (en) | Energy storage converter charging and discharging control system without direct current sensor | |
| CN106300440A (en) | Microgrid inverter system based on droop control and smooth-switching method thereof | |
| CN108054724B (en) | A kind of power-supply system and its control method | |
| CN111313387B (en) | Flexible direct-current power grid layered architecture control protection system and protection method | |
| CN107612013B (en) | Direct-current power grid voltage range control method |
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 |