CN106712068A - Parallel hybrid DC power transmission system and reactive power regulation optimization method thereof - Google Patents
Parallel hybrid DC power transmission system and reactive power regulation optimization method thereof Download PDFInfo
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- CN106712068A CN106712068A CN201611262294.0A CN201611262294A CN106712068A CN 106712068 A CN106712068 A CN 106712068A CN 201611262294 A CN201611262294 A CN 201611262294A CN 106712068 A CN106712068 A CN 106712068A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000033228 biological regulation Effects 0.000 title abstract description 7
- 238000005457 optimization Methods 0.000 title abstract description 5
- 238000009499 grossing Methods 0.000 claims description 11
- 238000013459 approach Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 6
- 238000011217 control strategy Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
-
- 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
-
- 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]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a parallel hybrid DC power transmission system and a reactive power regulation optimization method thereof. The system is formed by a conventional DC power transmission system and a flexible DC power transmission system, which are connected in parallel. The flexible DC power transmission system comprises a flexible DC control system. The flexible DC control system comprises an additional regulation reactive power controller. The reactive power regulation optimization method comprises a reactive power regulation method for a switch-in state of an AC filter of the conventional DC power transmission system and a reactive power regulation method for a switch-out state of the AC filter of the conventional DC power transmission system. The technical scheme optimizes reactive power control strategy of the hybrid DC power transmission system, reduces reactive fluctuations caused by switching operation of the AC filter of the conventional DC power transmission system, prevents reactive power impact to an AC system due to reactive power shortage or surplus of the system, and suppresses change of dynamic AC voltage.
Description
Technical field
The present invention relates to DC transmission system, and in particular to a kind of Hybrid HVDC system in parallel and its Reactive-power control are excellent
Change method.
Background technology
As the development of large power all-controlled type electronic power switch device technology, the research of Novel Control, direct current are defeated
Electric cost gradually reduce and operation of power networks reliability requirement raising, based on the HVDC transmission system line commutation change of current
Device (line commutated converter based high voltage direct current, LCC-HVDC) and base
In HVDC transmission system voltage source converter (voltage source converter based HVDC, VSC-HVDC)
Hybrid HVDC technology be expected to give full play to two kinds of advantages of technology of transmission of electricity, make up respective defect, be that large regional grid is carried
It is extensive for many drop points of big city direct current supply, load center are provided new approaches by electricity for more new interconnection modes
New energy accesses power network and submitting and dissolves offer new method.
With gradually increasing and successful Applications of the VSC-HVDC in different field for LCC-HVDC engineerings, LCC-HVDC and
The electrical distance of the same ac bus of the very possible feed-ins of VSC-HVDC, or both is close, and many feed-ins of mixing of the type are straight
Stream transmission system will gradually increase.Current China East China Power Grid possesses abundant land and offshore wind energy resource, existing a plurality of
Coastal region of the LCC-HVDC circuit drop points near Shanghai, Donghai Bridge in Shanghai Nanhui wind power plant is networked work by VSC-HVDC
Journey has put into operation, and with continually developing for marine wind electric field and increasing for the West-to-East Electricity Transmission Project, East China Power Grid will form a plurality of
VSC-HVDC and the situation of a plurality of LCC-HVDC mixing feed-in.Equally, with the end VSC-HVDC DC engineerings of Zhoushan Of Zhejiang Province five
Put into operation, mixing double-fed in the parallel connection that Shengsi island also form a LCC-HVDC circuit with a VSC-HVDC circuit is constituted enters directly
Stream transmission system.In recent years, in order to ensure the safe and stable operation of bulk power grid, south electric network has taken the lead in realization VSC-HVDC will
Yunnan Power System and southern major network subnetting operation, realize Yunnan Asynchronous Interconnection.State Grid Corporation of China is also straight back-to-back in planning Chongqing Hubei Province
Stream Project Realization southwest power network and the asynchronous interconnection of Central China Power Grid, form LCC-HVDC and mix double with VSC-HVDC parallel connections in dragon's fountain
Infeed HVDC Systems.Additionally, worldwide, formed between Norway's power network and Denmark's power network four LCC-HVDC with
VSC-HVDC mixing Multi-infeed HVDC transmission systems in parallel, Canadian Manny Ba Tuo hydroelectric boards are also planning at original two
On the basis of LCC-HVDC bipolar direct current transmission lines, Article 3 Hybrid HVDC circuit is built.No matter in China or generation
Boundary, continuous planning with VSC-HVDC with build, in following power network, will be formed it is increasing by VSC-HVDC and
The mixing double-fed that LCC-HVDC is constituted enters or Multi-infeed HVDC transmission system, and this will bring to the security and stability control of following power network
New challenge.
Reactive balance is the key of system stable operation, and customary DC needs consumption substantial amounts of delayed idle in operation
Power.The idle superfluous or not enough fluctuation that can all directly contribute alternating voltage again, jeopardizes the peace of whole AC and DC system when serious
Entirely.Therefore customary DC typically all configures the reactive power compensators such as alternating current filter of certain capacity.Customary DC presses idle benefit
Device switching table is repaid, according to active change and system running state, switching is carried out to reactive power compensator, to ensure ac bus
The reactive power of voltage and current conversion station and systems exchange is within the limits prescribed.However, the idle control of customary DC transmission of electricity is in
It is existing stepped, the situation of power surplus or underpower is likely to occur during Reactive-power control.Technology of HVDC based Voltage Source Converter profit
With IGBT elements can turn-off characteristic, the power adjusting characteristic of its dynamic reactive enabling capabilities and fast and flexible, it is possible to increase be
System power supply reliability, so as to realize two kinds of effective cooperations of direct current transportation form reactive power.
Existing Hybrid HVDC System Reactive Power control measure are general from the reactive power compensator control of improvement customary DC
Strategy, flexible direct current is idle or voltage controller parameter is started with so that control system is in AC and DC line fault or changes
Mutually unsuccessfully etc. after operating mode, Voltage Drop or idle missing are quickly detected, or system electricity is caused using specific control measure
Fast quick-recovery is pressed, but not by two kinds of idle cooperations of transmission system.With flexible direct current engineering voltage, the lifting of capacity,
Parallel connection mixing Multi-infeed HVDC transmission system form will more and more extensively, and System Reactive Power fluctuation will increasingly dash forward with Voltage-stabilizing Problems
Go out, but have no the idle fitting method of system.
Accordingly, it is desirable to provide a kind of Reactive-power control optimization method of Hybrid HVDC system in parallel contains mixing to improve
The ability of the ac and dc systemses voltage stabilization of straight-flow system, reduces system voltage fluctuation.
The content of the invention
The present invention provides a kind of Hybrid HVDC system in parallel, and the system is straight by customary DC transmission system and flexibility
Stream transmission system is composed in parallel, and the flexible direct current power transmission system includes flexible direct current control system, the flexible direct current control
System includes additional coordination reactive controller.
The customary DC transmission system includes converter power transformer (1), converter valve (2), alternating current filter (3), flat ripple electricity
Anti- device (4), DC filter (5) and DC line；
The converter power transformer (1) is connected with converter valve (2), and converter valve (2) one end ground connection other end and flat ripple are electric
The connection of anti-device (4) one end, smoothing reactor (4) other end respectively with DC line and be connected DC filter (5) connection.
The flexible direct current power transmission system includes the converter power transformer (6), bridge arm reactor (9), the converter valve that are sequentially connected
(7), smoothing reactor (8) and DC line.
The idle coordination optimizing method of the Hybrid HVDC system in parallel, including：Customary DC transmission system is exchanged
The idle coordination approach and customary DC transmission system alternating current filter of wave filter input state cut off the idle coordination side of state
Method.
The Reactive-power control method of the customary DC transmission system alternating current filter input state includes：
Step 1-1：The input signal of flexible direct current control system automatic identification customary DC transmission system alternating current filter；
Step 1-2：The reactive power that the additional coordination reactive controller of the flexible direct current control system is dynamically generated
The reactive power generated when not adding and coordinate reactive controller with flexible direct current control system instruction is instructed to be superimposed, generation is actual idle
Power instruction；
Step 1-3：The actual reactive power instruction increases flexible DC power transmission system according to system acceptable speed
Unite the reactive power of output, be used to compensate customary DC transmission system before alternating current filter input system reactive power it is scarce
Volume；
Step 1-4：When the customary DC transmission system alternating current filter puts into, flexible direct current power transmission system is exported
Reactive power recovers to 0 the instruction of actual reactive power after being reduced to setting value.
The idle coordination approach of the customary DC transmission system alternating current filter excision state includes：
Step 2-1：The excision signal of flexible direct current control system automatic identification customary DC wave filter；
Step 2-2：The reactive power that the additional coordination reactive controller of the flexible direct current control system is dynamically generated
The reactive power generated when not adding and coordinate reactive controller with flexible direct current control system instruction is instructed to be superimposed, generation is actual idle
Power instruction；
Step 2-3：The actual reactive power instruction reduces flexible DC power transmission system according to system acceptable speed
The reactive power of system output, the surplus of system reactive power before being cut off with the alternating current filter for compensating customary DC transmission system；
Step 2-4：During the alternating current filter switching of customary DC transmission system, the nothing that flexible direct current power transmission system is exported
Work(power reduction recovers to 0 the instruction of actual reactive power to after setting value.
With immediate prior art ratio, the present invention provide technical scheme there is following excellent effect：
The present invention provide technical scheme, optimize the idle control strategy of Hybrid HVDC system, reduce due to
Customary DC transmission system switching alternating current filter operation caused reactive power fluctuation, it is to avoid the vacancy or surplus of System Reactive Power
To the reactive power impact of AC system, it is suppressed that dynamic communication voltage change.
Brief description of the drawings
Fig. 1 is Hybrid HVDC system in parallel；
The Hybrid HVDC System Reactive Power coordination optimizing method schematic diagram in parallel that Fig. 2 is provided for the present invention；
Fig. 3 is reactive power bang path schematic diagram when flexible direct current control system is using fixed idle control；
Reactive power transmission during the idle coordination optimizing method that Fig. 4 is provided for flexible direct current control system using the present invention
Path schematic diagram；
Fig. 5 is flexible direct current control system using the reactive power bang path schematic diagram determined when alternating voltage is controlled.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings：
The present invention provides a kind of Hybrid HVDC system in parallel as shown in Figure 1, and the system is transmitted electricity by customary DC
System and flexible direct current power transmission system are composed in parallel, and the flexible direct current power transmission system includes flexible direct current control system, described
Flexible direct current control system includes additional coordination reactive controller.
The customary DC transmission system include converter power transformer 1, converter valve 2, alternating current filter 3, smoothing reactor 4,
DC filter 5 and DC line；
The converter power transformer 1 is connected with converter valve 2, and the one end of the converter valve 2 is grounded the other end and smoothing reactor 4 one
End connection, the other end of the smoothing reactor 4 respectively with DC line and be connected DC filter 5 and connect.
The flexible direct current power transmission system includes that converter power transformer 6, converter valve 7, smoothing reactor 8, bridge arm reactor 9 are straight
Flow Line；
The converter power transformer 6, bridge arm reactor 9, converter valve 7, smoothing reactor 8, DC line are sequentially connected.
The idle coordination optimizing method of the Hybrid HVDC system in parallel, including：Customary DC transmission system is exchanged
The idle coordination approach and customary DC transmission system alternating current filter of wave filter input state cut off the idle coordination side of state
Method.
The Reactive-power control method of the customary DC transmission system alternating current filter input state includes：
Step 1-1：The input signal of flexible direct current control system automatic identification customary DC transmission system alternating current filter；
Step 1-2：The additional coordination reactive controller of flexible direct current control system dynamically generation reactive power instruction, by institute
State it is idle instruction be superimposed upon flexible direct current control system do not add coordinate reactive controller when generate reactive power instruction on, generation
Actual reactive power instruction, as shown in Figure 2；
Step 1-3：The actual reactive power instruction increases flexible DC power transmission system according to system acceptable speed
Unite the reactive power of output, be used to compensate customary DC transmission system before alternating current filter input system reactive power it is scarce
Volume；
Step 1-4：When the customary DC transmission system alternating current filter puts into, flexible direct current power transmission system is exported
Reactive power is rapidly reduced to setting value, afterwards by the slow recovery of actual reactive power instruction to 0.
The idle coordination approach of the customary DC transmission system alternating current filter excision state includes：
Step 2-1：The excision signal of flexible direct current control system automatic identification customary DC wave filter；
Step 2-2：The additional coordination reactive controller of flexible direct current control system dynamically generation reactive power instruction, by institute
State it is idle instruction be superimposed upon flexible direct current control system do not add coordinate reactive controller when generate reactive power instruction on, generation
Actual reactive power instruction, as shown in Figure 2；
Step 2-3：The actual reactive power instruction reduces flexible DC power transmission system according to system acceptable speed
The reactive power of system output, the surplus of system reactive power before being cut off with the alternating current filter for compensating customary DC transmission system；
Step 2-4：During the alternating current filter switching of customary DC transmission system, the nothing that flexible direct current power transmission system is exported
Work(power is rapidly reduced to setting value, afterwards by the slow recovery of actual reactive power instruction to 0.
In the Hybrid HVDC system in parallel, when the alternating current filter of customary DC carries out switching operation, can be right
System produces reactive power impact to cause AC voltage fluctuations.When flexible direct current uses different idle control strategies, customary DC
Alternating current filter carries out the propagation path for causing System Reactive Power to fluctuate during switching operation.
When flexible direct current control system is using fixed idle control, it is 0 to determine idle, then because customary DC transmission system is exchanged
The reactive power fluctuation that wave filter carries out caused by switching operation is undertaken by AC system, and customary DC transmission system is defeated with flexible direct current
There is no idle transmission between electric system, its is idle bang path, as shown in Figure 3.
During the idle coordination optimizing method that Hybrid HVDC system is provided using the present invention, flexible direct current control system can
Exerted oneself with according to customary DC transmission system running status quick regulation is idle, reduce customary DC transmission system alternating current filter
Reactive power fluctuation caused by switching operation, the reactive power fluctuation is no longer undertaken by AC system, can reduce the impact to AC system,
Its is idle bang path, as shown in Figure 4.
In Hybrid HVDC system, when flexible direct current control system is using alternating voltage control determine, its is idle transmission road
Footpath is as shown in Figure 5.According to the alternating voltage change for detecting, adjust idle to reduce AC voltage fluctuations, the part is idle to be
Q1.Reactive power fluctuation caused by customary DC transmission system alternating current filter switching operation, by AC system Q3And flexible direct current Q2
It is common to provide.
Finally it should be noted that：Above example is merely to illustrate technical scheme rather than to its protection domain
Limitation, although being described in detail to the application with reference to above-described embodiment, those of ordinary skill in the art should
Understand：Those skilled in the art read still can be to applying after the application specific embodiment carry out a variety of changes, modification or
Person's equivalent, but these changes, modification or equivalent, are applying within pending claims.
Claims (6)
1. a kind of Hybrid HVDC system in parallel, it is characterised in that the system is straight by customary DC transmission system and flexibility
Stream transmission system is composed in parallel, and the flexible direct current power transmission system includes flexible direct current control system, the flexible direct current control
System includes additional coordination reactive controller.
2. parallel connection Hybrid HVDC system as claimed in claim 1, it is characterised in that the customary DC transmission system bag
Include converter power transformer (1), converter valve (2), alternating current filter (3), smoothing reactor (4), DC filter (5) and AC line
Road；
The converter power transformer (1) is connected with converter valve (2), and described converter valve (2) one end is grounded the other end and smoothing reactor
(4) one end connection, smoothing reactor (4) other end respectively with DC line and be connected DC filter (5) connection.
3. parallel connection Hybrid HVDC system as claimed in claim 1, it is characterised in that the flexible direct current power transmission system bag
Include converter power transformer (6), bridge arm reactor (9), converter valve (7), smoothing reactor (8) and the DC line being sequentially connected.
4. the idle coordination optimizing method of any Hybrid HVDC systems in parallel of claim 1-3, it is characterised in that institute
Stating idle coordination optimizing method includes：The idle coordination approach and routine of customary DC transmission system alternating current filter input state
DC transmission system alternating current filter cuts off the idle coordination approach of state.
5. idle coordination optimizing method as claimed in claim 4, it is characterised in that the customary DC transmission system exchange filter
The Reactive-power control method of ripple device input state includes：
Step 1-1：The input signal of flexible direct current control system automatic identification customary DC transmission system alternating current filter；
Step 1-2：The reactive power instruction that the additional coordination reactive controller of the flexible direct current control system is dynamically generated
The reactive power instruction generated when not adding and coordinate reactive controller with flexible direct current control system is superimposed, and generates actual reactive power
Instruction；
Step 1-3：It is defeated that the actual reactive power instruction increases flexible direct current power transmission system according to system acceptable speed
The reactive power for going out, is used to compensate the vacancy of customary DC transmission system system reactive power before alternating current filter input；
Step 1-4：When the customary DC transmission system alternating current filter puts into, by the idle of flexible direct current power transmission system output
Power reduction recovers to 0 the instruction of actual reactive power to after setting value.
6. idle coordination optimizing method as claimed in claim 4, it is characterised in that the customary DC transmission system exchange filter
The idle coordination approach of ripple device excision state includes：
Step 2-1：The excision signal of flexible direct current control system automatic identification customary DC wave filter；
Step 2-2：The additional coordination reactive controller of flexible direct current control system is dynamically generated reactive power instruction and flexibility
DC control system does not add the reactive power instruction superposition for coordinating to be generated during reactive controller, generates actual reactive power instruction；
Step 2-3：It is defeated that the actual reactive power instruction reduces flexible direct current power transmission system according to system acceptable speed
The reactive power for going out, is used to compensate the surplus of the preceding system reactive power of customary DC transmission system alternating current filter excision；
Step 2-4：During the alternating current filter switching of customary DC transmission system, the idle work(that flexible direct current power transmission system is exported
Rate recovers to 0 the instruction of actual reactive power after being reduced to setting value.
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Cited By (4)
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| CN110391667A (en) * | 2019-07-11 | 2019-10-29 | 广东电网有限责任公司 | A kind of control method reducing filter continual on-off in Hybrid HVDC system |
| CN110808604A (en) * | 2019-11-18 | 2020-02-18 | 广东电网有限责任公司 | Three-port energy control device based on MMC structure |
| CN111864762A (en) * | 2020-07-22 | 2020-10-30 | 华中科技大学 | Reactive power coordination control method for hybrid multi-feed-in direct current system for reducing switching of filter |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391667A (en) * | 2019-07-11 | 2019-10-29 | 广东电网有限责任公司 | A kind of control method reducing filter continual on-off in Hybrid HVDC system |
| CN110391667B (en) * | 2019-07-11 | 2020-07-14 | 广东电网有限责任公司 | Control method for reducing frequent switching of filter in hybrid direct-current power transmission system |
| CN110808604A (en) * | 2019-11-18 | 2020-02-18 | 广东电网有限责任公司 | Three-port energy control device based on MMC structure |
| CN111864762A (en) * | 2020-07-22 | 2020-10-30 | 华中科技大学 | Reactive power coordination control method for hybrid multi-feed-in direct current system for reducing switching of filter |
| CN111864762B (en) * | 2020-07-22 | 2021-10-08 | 华中科技大学 | Reactive power coordination control method for hybrid multi-feed-in direct current system for reducing switching of filter |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN112600224B (en) * | 2020-12-08 | 2022-09-30 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
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