CN104300570B - All-station reactive power control method of bipolar flexible direct current transmission system - Google Patents
All-station reactive power control method of bipolar flexible direct current transmission system Download PDFInfo
- Publication number
- CN104300570B CN104300570B CN201410604310.4A CN201410604310A CN104300570B CN 104300570 B CN104300570 B CN 104300570B CN 201410604310 A CN201410604310 A CN 201410604310A CN 104300570 B CN104300570 B CN 104300570B
- Authority
- CN
- China
- Prior art keywords
- reactive power
- power control
- unit
- convertor
- bipolar
- 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
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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses an all-station reactive power control method of a bipolar flexible direct current transmission system. At the same moment, no more than one convertor unit is in the alternating voltage control mode, and reactive power control over two convertor units is achieved based on the capacitive reactance interlocking principle. According to the reactive distribution strategy of the two convertor units, when both the two convertor units are in the bipolar power control mode, the bipolar output reactive power is in direct proportion to the absolute value of bipolar direct current voltage; when one convertor unit is in the bipolar power control mode, and the other convertor unit is in the unipolar power control mode, a unipolar power control unit independently controls the corresponding convertor unit to output reactive power, and all-station reactive power is maintained by a bipolar power control unit; when both the two convertor units are in the unipolar power control mode, the two convertor units are independently controlled to output reactive power. By the adoption of the all-station reactive power control method of the bipolar flexible direct current transmission system, coordinated control and optimal operation of the two convertor units of the bipolar flexible direct current transmission system are achieved.
Description
Technical field
The invention belongs to technical field of direct current power transmission, and in particular to a kind of whole station of bipolar flexible direct current transmission system is idle
Poewr control method.
Background technology
Flexible DC power transmission adopts voltage source converter, can exchange system with idle output, raising so that independent regulation is active
The ability to transmit electricity of system, it is easy to constitute multi-terminal direct current transmission system, electricity generation grid-connecting, isolated island urban electricity supply in regenerative resource and
The applications such as AC system interconnection, with obvious competitiveness.It is with the progress of power electronic devices and control technology, flexible
D.C. capacity and electric pressure more and more higher.
In order to realize the requirement of high-capacity power conveying, need to increase submodule quantity to improve its electric pressure, but mistake
The cascade of multi-tool block increases valve control equipment control difficulty, therefore adopts dipolar configuration form, reduces single convertor unit submodule
Same through-put power is reached while cascade number becomes a kind of feasible selection.
, relative to monopolar DC system, its reliability is higher for bipolar flexible direct current transmission system, but its control is also more complicated, special
It is not the idle how optimal control of two flexible converter units, correlational study is less.Open up to give full play to bipolar flexible direct current
Structural advantage is flutterred, a kind of whole station reactive power control method of effective bipolar flexible direct current transmission system is needed.
The content of the invention
Not enough for prior art, the present invention proposes a kind of whole station Reactive Power Control of bipolar flexible direct current transmission system
Method, solves two convertor units while controlling the system disturbance that alternating voltage brings, solves two convertor units idle
Power distribution problems, avoid two convertor units one and produce the loss increase that one generation inductive reactive power of capacitive reactive power is brought
And the out-of-limit problem of capacity, realize the coordination control of two convertor units of bipolar flexible direct current transmission system and optimize operation.
In order to reach above-mentioned purpose, the present invention is realized using following technical proposals：A kind of bipolar flexible direct current transmission system
Whole station reactive power control method, bipolar flexible direct current transmission system current conversion station is in series by two convertor units, respectively
For positive pole unit and negative pole unit, correspondence the two poles of the earth DC voltage is respectively positive electrode bus voltage-to-ground and negative electrode bus are electric over the ground
Pressure, it is characterised in that：
At most one convertor unit is in alternating voltage control model in the same time, and two convertor unit Reactive Power Controls are pressed
Reactance interlocking principle is controlled, and the idle allocation strategy of two convertor units is：
When (1) two convertor unit is in bipolar power control model, the two poles of the earth output reactive power and the two poles of the earth unidirectional current
The absolute value of pressure is directly proportional；
In (2) two convertor units, a unit is controlled in bipolar power, when a unit is in one pole Power Control,
One pole power control unit individually controls its output reactive power, and whole station reactive power is maintained by bipolar power control unit；
When (3) two convertor units are in one pole Power Control, two convertor units individually control each to export idle
Power.
In such scheme：Described two convertor unit Reactive Power Controls refer to by reactance interlocking principle, positive pole unit with it is negative
Pole unit exports capacitive reactive power or exports inductive reactive power.
In such scheme：When described two convertor units are in bipolar power control model, the two poles of the earth output reactive power
Be directly proportional to the absolute value of the two poles of the earth DC voltage, the deviation range of two convertor unit output reactive powers rated capacity 10% with
It is interior.
In such scheme：When described two convertor units are in bipolar power control model, the two poles of the earth output reactive power
It is directly proportional to the absolute value of the two poles of the earth DC voltage, concrete grammar is：When two convertor units are in reactive power operation, according to
The two poles of the earth direct current voltage absolute value distribution reactive power instruction；Two convertor units one are in Reactive Power Control, and one is in
When alternating voltage is controlled, calculating predicts whole station reactive power, adjusts the instruction of Reactive Power Control unit, makes reactive power control
The reactive power of unit processed is equal to whole station reactive power * (the extremely corresponding direct current voltage absolute value/(alternating current of Reactive Power Control
The extremely corresponding direct current voltage absolute value of the corresponding direct current voltage absolute value+Reactive Power Control of pressure control pole)).
In such scheme：The one pole power control unit individually controls its output reactive power, whole station reactive power by
Maintaining, concrete grammar is bipolar power control unit：In bipolar power control reactive power output valve be equal to whole station without
Work(performance number deducts one pole Power Control pole output reactive power value.
In such scheme：It is described in the same time at most one be in alternating voltage control model, concrete methods of realizing is, two
By interpolar communication, convertor unit realizes that the two poles of the earth control model is mutually verified, if will to be switched to alternating current voltage-controlled for a wherein pole unit
Molding formula, and detect another pole unit in alternating voltage control model when, must etc. another pole unit release alternating current it is voltage-controlled
After system power, the pole unit can just be switched to alternating voltage control model.
After such scheme, beneficial effects of the present invention are：
(1) the whole station reactive power control method of a kind of bipolar flexible direct current transmission system that the present invention is provided, it is to avoid
Two convertor units control alternating voltage simultaneously, cause System Reactive Power to fluctuate；
(2) the whole station reactive power control method of a kind of bipolar flexible direct current transmission system that the present invention is provided, it is to avoid
One convertor unit exports capacitive reactive power, and a convertor unit exports convertor unit loss increase and the capacity that inductive reactive power is caused
Out-of-limit problem；
(3) a kind of whole station reactive power control method of bipolar flexible direct current transmission system that the present invention is provided, realizes
The coordination control and optimization operation of two convertor units of bipolar flexible direct current transmission system.
Description of the drawings
Fig. 1 is the structural representation of bipolar flexible direct current transmission system current conversion station；
Fig. 2 is a kind of whole station reactive power control method operation stream of bipolar flexible direct current transmission system that the present invention is provided
Cheng Tu.
Specific embodiment
Below with reference to the drawings and the specific embodiments, technical scheme is described in detail.
Bipolar flexible direct current transmission system current conversion station is illustrated in figure 1, including：Multiple converter power transformers, inverter.The change of current
Device is made up of two convertor units；Wherein, anode of the one end of positive pole unit for inverter, the other end and negative pole of positive pole unit
One end of unit is connected and is grounded by neutral bus, and the other end of negative pole unit is the negative terminal of inverter.In figure, Q is just criticized
Pole unit output reactive power, Q is negative to refer to negative pole unit output reactive power, and Udc is just referring to positive bus voltage, and Udc is negative to refer to negative pole
Busbar voltage, S are the specified apparent capacities of whole station, and the two poles of the earth communicate transmission state amount and analog signalses by interpolar.
Fig. 2 show the whole station Reactive Power Control flow chart of bipolar flexible direct current transmission system.
Positive pole unit and negative pole unit are in running status.
At most one convertor unit is in alternating voltage control model implementation method, positive pole unit and negative pole unit in the same time
Realize that the two poles of the earth mutually verify by interpolar communication, if wherein a pole unit will be switched to alternating voltage control model, and detect
When another pole unit is in alternating voltage control model, after another pole unit release alternating voltage control such as palpus, the pole unit
Alternating voltage control model can be just switched to.Finally realize that the idle class control model in the two poles of the earth is as follows：1) two convertor units one
Convertor unit is controlled in alternating voltage, and a convertor unit is in Reactive Power Control；2) two convertor units are in nothing
Work(Power Control.
Meanwhile, in order to avoid two convertor units, one sends reactive power (capacitive reactive power), an absorbing reactive power
(inductive reactive power), causes single current conversion station capacity out-of-limit and loss increase, and two convertor unit Reactive Power Controls are interlocked by capacitive reactance
Principle is controlled, and capacitive reactance is interlocked two convertor units and communicated by interpolar, and mutually transmission receives the reactive power to pole output, by adjusting
The whole current conversion station output reactive power for instructing value attribute different idle from whole station, so as to ensure that positive pole unit is defeated with negative pole unit
Go out capacitive reactive power or inductive reactive power.So as to avoid an output capacitive reactive power in two convertor units, a convertor unit output
Inductive reactive power.
Under the conditions of meeting above-mentioned two, the whole station reactive power method of salary distribution is as follows：
(1) if two convertor units are in bipolar power control model, two the two poles of the earth output reactive powers and the two poles of the earth
The absolute value of DC voltage is directly proportional, i.e., shown in Fig. 1 Q just/Q is negative=| Udc just |/| Udc bears |.
(2) if a unit is controlled in bipolar power in two convertor units, one pole Power Control at a unit
(pole power independent control), one pole Power Control (pole power independent control) unit individually control its output reactive power, whole station
Reactive power is maintained by bipolar power control unit, and the reactive power output valve in bipolar power control is equal to whole station
Reactive power value deducts one pole Power Control (pole power independent control) output reactive power value.
(3) if two convertor units are in one pole Power Control (pole power independent control), two convertor unit lists
Respective reactive power is controlled solely.
When two convertor units are in bipolar power control model, the two poles of the earth output reactive power and the two poles of the earth DC voltage
Absolute value is directly proportional, and concrete grammar is：It is when two convertor units are in reactive power operation, absolute according to the two poles of the earth DC voltage
Value distribution reactive power instruction；Two convertor units one are in Reactive Power Control, one in alternating voltage control when, meter
Calculation predicts whole station reactive power, adjusts the instruction of Reactive Power Control unit so as to equal to whole station reactive power * (idle work(
The corresponding direct current voltage absolute value of the rate control pole/(corresponding direct current voltage absolute value+Reactive Power Control of alternating voltage control pole
Extremely corresponding direct current voltage absolute value)).
In order to further optimize operation characteristic when two convertor units are in bipolar power control model, it is considered to different limits
Condition processed and measurement error, it is allowed to which when the two poles of the earth voltage symmetry is run, the difference of the two poles of the earth output reactive power is in whole station rated capacity
Within 10%, i.e., | the n- Q of Q bear |<10%*S, it is believed that two station output reactive powers are in same range.| the n- Q of Q bear |>
Corresponding convertor unit reactive power is adjusted after 10%*S, adjustable strategies are two changes of current to be adjusted to (Q just+Q bear)/2 directions, most
The difference of two convertor unit output reactive powers is made eventually within the 10% of whole station rated capacity.
When in two convertor units, a unit is controlled in bipolar power, a unit is in one pole Power Control (pole
Power independent control), one pole power control unit individually controls its output reactive power, and whole station reactive power is by bipolar work(
Maintaining, its implementation is rate control unit：Reactive power output valve in bipolar power control is equal to the idle work(of whole station
Rate value deducts the reactive power value of one pole power control unit output.
Finally it should be noted that：Above example only illustrates technical scheme rather than a limitation, it is impossible to
Protection scope of the present invention is limited with this, it is every according to technological thought proposed by the present invention, done on the basis of technical scheme
Any change, which is encompassed by within scope of the presently claimed invention.
Claims (6)
1. the whole station reactive power control method of a kind of bipolar flexible direct current transmission system, the bipolar flexible direct current transmission system change of current
Stand in series by two convertor units, respectively positive pole unit and negative pole unit, correspondence the two poles of the earth DC voltage is respectively positive pole
Bus Voltage and negative electrode bus voltage-to-ground, it is characterised in that：
At most one convertor unit is in alternating voltage control model in the same time, and two convertor unit Reactive Power Controls press capacitive reactance
Interlocking principle is controlled, and the idle allocation strategy of two convertor units is：
When (1) two convertor unit is in bipolar power control model, the two poles of the earth output reactive power and the two poles of the earth DC voltage
Absolute value is directly proportional；
In (2) two convertor units, a unit is controlled in bipolar power, when a unit is in one pole Power Control, one pole
Power control unit individually controls its output reactive power, and whole station reactive power is maintained by bipolar power control unit；
When (3) two convertor units are in one pole Power Control, two convertor units individually control respective output reactive power.
2. the whole station reactive power control method of bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：
Described two convertor unit Reactive Power Controls are referred to that by reactance interlocking principle positive pole unit exports capacitive reactive power with negative pole unit
Or export inductive reactive power.
3. the whole station reactive power control method of bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：
When described two convertor units are in bipolar power control model, the two poles of the earth output reactive power is absolute with the two poles of the earth DC voltage
Value is directly proportional, and the deviation range of two convertor unit output reactive powers is within rated capacity 10%.
4. the whole station reactive power control method of bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：
When described two convertor units are in bipolar power control model, the two poles of the earth output reactive power is absolute with the two poles of the earth DC voltage
Value is directly proportional, and concrete grammar is：When two convertor units are in reactive power operation, according to the two poles of the earth direct current voltage absolute value point
Instruct with reactive power；Two convertor units one are in Reactive Power Control, one in alternating voltage control when, calculate pre-
Whole station reactive power is measured, the instruction of Reactive Power Control unit is adjusted, is equal to the reactive power of Reactive Power Control unit
Whole station reactive power * (the extremely corresponding direct current voltage absolute value of Reactive Power Control/(the corresponding unidirectional current of alternating voltage control pole
The extremely corresponding direct current voltage absolute value of pressure absolute value+Reactive Power Control)).
5. the whole station reactive power control method of bipolar flexible direct current transmission system as claimed in claim 1, it is characterised in that：
The one pole power control unit individually controls its output reactive power, and whole station reactive power is tieed up by bipolar power control unit
Hold, concrete grammar is：Reactive power output valve in bipolar power control deducts one pole power equal to whole station reactive power value
The reactive power value of control pole output.
6. the whole station reactive power control method of a kind of bipolar flexible direct current transmission system as claimed in claim 1, its feature
It is：It is described in the same time at most one be in alternating voltage control model, concrete methods of realizing is, two convertor units pass through pole
Between communication realize that the two poles of the earth control model is mutually verified, if wherein a pole unit will be switched to alternating voltage control model, and detect
When being in alternating voltage control model to another pole unit, after another pole unit release alternating voltage control such as palpus, this is extremely single
Unit can just be switched to alternating voltage control model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410604310.4A CN104300570B (en) | 2014-10-31 | 2014-10-31 | All-station reactive power control method of bipolar flexible direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410604310.4A CN104300570B (en) | 2014-10-31 | 2014-10-31 | All-station reactive power control method of bipolar flexible direct current transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104300570A CN104300570A (en) | 2015-01-21 |
| CN104300570B true CN104300570B (en) | 2017-04-19 |
Family
ID=52320200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410604310.4A Active CN104300570B (en) | 2014-10-31 | 2014-10-31 | All-station reactive power control method of bipolar flexible direct current transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104300570B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993499B (en) * | 2015-07-28 | 2017-07-04 | 南方电网科学研究院有限责任公司 | Reactive output power control method and system for combined back-to-back direct current transmission system |
| CN105207245B (en) * | 2015-10-31 | 2017-05-17 | 南京南瑞继保电气有限公司 | Active power type control method for running mode of bipolar flexible direct current power transmission system |
| CN105515034B (en) * | 2015-12-01 | 2018-05-04 | 许继电气股份有限公司 | A kind of Poewr control method of the bipolar MMC-HVDC systems in both ends |
| CN105823945B (en) * | 2016-04-13 | 2018-10-23 | 国网福建省电力有限公司 | A kind of true bipolar flexible direct current passive inverter experimental rig and test method |
| CN105811449B (en) * | 2016-05-22 | 2018-07-06 | 辽宁省电力有限公司大连供电公司 | A kind of flexible direct current power transmission system reactive power distribution method |
| CN107147140B (en) * | 2017-05-05 | 2019-09-27 | 南京南瑞继保电气有限公司 | A kind of DC transmission system power instruction deviation monitoring device and deviation monitoring method |
| CN108199401B (en) * | 2017-09-07 | 2019-06-07 | 东南大学 | A kind of station level control method of true bipolar flexible direct current transmission system |
| CN108521136B (en) * | 2018-04-24 | 2019-06-28 | 东南大学 | A kind of multiple target cooperative control method based on true bipolar flexible direct current transmission system |
| CN112202195B (en) * | 2020-09-10 | 2023-01-24 | 深圳供电局有限公司 | Converter station control method, converter station control device, computer equipment and readable storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202445B (en) * | 2007-12-21 | 2010-06-02 | 华北电力大学 | Method for double feed-in DC power transmission |
| JP5832162B2 (en) * | 2011-06-29 | 2015-12-16 | 株式会社豊田中央研究所 | Power system |
| CN103840473B (en) * | 2014-02-27 | 2016-08-31 | 国家电网公司 | A kind of double set SVC cooperative control device |
-
2014
- 2014-10-31 CN CN201410604310.4A patent/CN104300570B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104300570A (en) | 2015-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104300570B (en) | All-station reactive power control method of bipolar flexible direct current transmission system | |
| CN108039719B (en) | Turn the bipolar Multi-end flexible direct current transmission system Corrective control method of band based on power | |
| EP3681006B1 (en) | Voltage and current control method and device for direct-current power transmission system | |
| US20160336751A1 (en) | Tripolar vsc-hvdc transmission system and method | |
| CN104325894B (en) | A kind of many feeder lines combination type is for power transformation structure | |
| CN104953625B (en) | Secondary voltage control based reactive power distribution method for distributed power supplies in micro-grid | |
| CN103944182A (en) | Method for controlling energy storage inverter PQ in grid-connected state | |
| CN104129788B (en) | A kind of start up system of polycrystalline silicon reducing furnace | |
| CN106655291A (en) | Micro-grid group architecture and autonomous coordination control method thereof | |
| CN105429165A (en) | Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology | |
| CN106911260A (en) | A kind of control method of multi-electrical level inverter, device and inverter | |
| CN106026154A (en) | Modeling method for extra-high-voltage direct-current layered access power transmission system | |
| CN103532126A (en) | Method for controlling main circuit parameters in two-end flexible direct current transmission system | |
| CN103441676A (en) | Modularized device for conversion between high-voltage direct current and direct current | |
| CN103078287A (en) | Direct-current high-current ice-melting device with STATCOM function | |
| CN106329557A (en) | Control apparatus, system and method for multi-pole flexible direct current power transmission system | |
| CN204279138U (en) | A kind of many feeder lines compound type is for power transformation structure | |
| CN107332290B (en) | Regional load transfer method based on direct current circuit | |
| CN102983586B (en) | A kind of HVDC based on three-level voltage source converter holds concurrently UPFC system | |
| CN203103884U (en) | DC high-current ice melting apparatus with STSTCOM function | |
| CN104767218A (en) | Direct-current power flow controller | |
| CN105141159B (en) | A kind of three-phase modular multilevel inverter parallel system and its control method | |
| CN107612011A (en) | Cooperating type DC power flow controller circuitry topological structure and progress control method | |
| CN103762583A (en) | Tandem type multi-terminal direct-current power transmission system and power control method thereof | |
| CN106885961A (en) | MMC HVDC black starting-ups simulation experiment systems and test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |