CN110247415A - A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation - Google Patents
A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation Download PDFInfo
- Publication number
- CN110247415A CN110247415A CN201910382313.0A CN201910382313A CN110247415A CN 110247415 A CN110247415 A CN 110247415A CN 201910382313 A CN201910382313 A CN 201910382313A CN 110247415 A CN110247415 A CN 110247415A
- Authority
- CN
- China
- Prior art keywords
- lcc
- voltage
- control
- wind
- mmc
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 15
- 230000005611 electricity Effects 0.000 title claims abstract description 11
- 101150013204 MPS2 gene Proteins 0.000 claims abstract description 12
- 238000007665 sagging Methods 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000035800 maturation Effects 0.000 abstract description 2
- 230000010354 integration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
-
- H02J3/386—
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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 Eletrric Generators (AREA)
Abstract
The present invention proposes that a kind of MMC-LCC type DC transmission system sent out suitable for wind-powered electricity generation is topological and its control method, this mixed type DC transmission system can provide reactive power and voltage support relative to LCC-HVDC system for sending end AC system；Have many advantages, such as that low switching loss, small investment, technology maturation, control are simple relative to VSC-HVDC system.When receiving end power grid is stronger, this mixed type DC transmission system has apparent advantage and competitiveness when remote wind power plant is sent outside, has broad application prospect.As wind power plant access MMC1 and MMC2, it is sent out to guarantee that wind power is stablized, and guarantee that the controlled variables such as system dc voltage, electric current, power are maintained in stability limit, it realizes the maximal power tracing control of blower, needs stable alternating voltage as support.Therefore for MMC1 and MMC2 using sagging control is improved, LCC, which is switched to, determines hold-off angle control.
Description
Technical field
The invention belongs to Hybrid HVDC technical fields, and in particular to a kind of Large Scale Wind Farm Integration is straight through MMC-LCC mixing
Flow the typical system topology and its control method that transmission system is sent out.
Background technique
Traditional power grid commutation inverter D.C. high voltage transmission (LCC-HVDC) system is big with transmission line capability, active power is quick
Controllably, route low cost, not the capacitive earth current of alternating current circuit the features such as have been widely recognized and apply.With new
Type full-control type semiconductor devices---- insulated gate bipolar transistor (IGBT) development and application, modularization multi-level converter
D.C. high voltage transmission (MMC-HVDC) system has obtained quick development.MMC-HVDC system can simultaneously and mutual independence is controlled
Active power processed, reactive power, can work, receiving-end system can be passive network, exist at present under the mode of passive inverter
There is advantage in new-energy grid-connected access scheme.Existing Hybrid HVDC system topological rectification side mostly uses LCC, therefore in wind
Additional commutation voltage is needed under electric field access scene, does not have competition under the grid-connected submitting scene of remote multiterminal Large Scale Wind Farm Integration
Power and advantage.
And in use rectification side MMC, the Polynuclear complex system of inverter side LCC, MMC can control wind power plant
Side alternating voltage, the shortcomings that needing additional commutation voltage when overcoming LCC connection wind power plant.Although inverter side uses LCC, when inverse
Becoming may cause commutation failure when top-cross streaming system breaks down, but can reduce its probability occurred by effectively controlling.
This mixed type DC transmission system can provide reactive power and voltage branch relative to LCC-HVDC for sending end AC system
Support；Have many advantages, such as that low switching loss, small investment, technology maturation, control are simple relative to VSC-HVDC system.In receiving end power grid
When stronger, this mixed type DC transmission system has apparent advantage and competitiveness when remote wind power plant is sent outside,
Has broad application prospect.
Summary of the invention
In consideration of it, the present invention proposes a kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation, in wind-powered electricity generation
Using sagging control is improved after field access MMC, to reduce the influence that new energy fluctuation is contributed to system, the specific steps are as follows:
1) when starting, MMC1 and MMC2 use constant DC voltage control, and LCC is started using constant DC current control；
2) as wind power plant access MMC1 and when MMC2, sent out to guarantee that wind power is stablized, and guarantee system dc voltage,
The controlled variables such as electric current, power are maintained in stability limit, are realized the maximal power tracing control of blower, are needed stable friendship
Galvanic electricity pressure is as support, therefore MMC1 and MMC2, using sagging control is improved, LCC, which is switched to, determines hold-off angle control.
LCC constant DC current control introduces current limiting low-voltage link (VDCOL) under normal circumstances in start-up course, not
It can play a role, its main function is to instruct when DC voltage or alternating voltage drop into some designated value to DC current
It is limited, a possibility that commutation failure occurs can be reduced, help direct current system fast quick-recovery after AC or DC failure,
Avoid valve stress caused by continuous commutation failure.
Detailed description of the invention
Fig. 1 is a kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation proposed by the present invention.
Fig. 2 is that sagging control figure is improved in the side MMC.
Fig. 3 is the value function f (u of direct-current voltage proportion coefficientd)。
Specific embodiment
Invention is further described with reference to the accompanying drawing.
MMC1 and the side MMC2 are incorporated to wind power plant after system normally starts, and control mode has constant voltage control to be converted at this time
It is as shown in Figure 2 to improve sagging control.K in figureuFor the proportionality coefficient of DC voltage, it is converter station DC voltage udFunction, be
Resist the interference of static fluctuation in controller, kuValue function f (ud) use hysteresis loop comparator.
The value function f (u of direct-current voltage proportion coefficientd) as shown in Figure 3.In figure: Udh1And Udh2Respectively voltage is sagging
The upper limit operation voltage and recovery voltage U of controllerdl1And Udl2Respectively droop control device lower limit operation voltage and recovery electricity
Pressure；KurefFor direct-current voltage proportion coefficient instruction value.The instruction value U of the controller DC voltagedrefValue function g (f
(ud)):
For LCC converter station as a DC voltage main control converter station, it is steady in steady-state operation to play DC voltage
Determine the effect of node.The station MMC1 and MMC2 has improvement droop control device, in steady-state operation, the direct current of MMC1 and the station MMC2
Pressure does not exceed range of operation (Udl1, Udh1), therefore k in improvement droop control device shown in Fig. 2u=0, in LCC converter station function
Rate is out-of-limit or wind power plant is incorporated in the case of system generation voltage fluctuation, and the station LCC loses the ability of stable DC voltage at this time,
The station MMC1 and MMC2 will improve sagging control model by determining dc power pattern switching.
Claims (2)
1. a kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation, using improvement after wind power plant accesses MMC
Sagging control, to reduce influence of the new energy fluctuation power output to system, the specific steps are as follows:
1) when starting, MMC1 and MMC2 use constant DC voltage control, and LCC is started using constant DC current control；
2) it as wind power plant access MMC1 and MMC2, is sent out to guarantee that wind power is stablized, and guarantee system dc voltage, electricity
The controlled variables such as stream, power are maintained in stability limit, are realized the maximal power tracing control of blower, are needed stable exchange
Voltage is as support, therefore MMC1 and MMC2, using sagging control is improved, LCC, which is switched to, determines hold-off angle control.
2. a kind of according to claim 1, MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation, feature
It is, LCC constant DC current control introduces current limiting low-voltage link (VDCOL) under normal circumstances in start-up course, can't
Play a role, its main function be when DC voltage or alternating voltage drop into some designated value to DC current instruct into
Row limitation, can reduce a possibility that commutation failure occurs, and help direct current system fast quick-recovery after AC or DC failure, keep away
Exempt from valve stress caused by continuous commutation failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910382313.0A CN110247415A (en) | 2019-05-09 | 2019-05-09 | A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910382313.0A CN110247415A (en) | 2019-05-09 | 2019-05-09 | A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110247415A true CN110247415A (en) | 2019-09-17 |
Family
ID=67883954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910382313.0A Pending CN110247415A (en) | 2019-05-09 | 2019-05-09 | A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110247415A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178539A (en) * | 2013-03-21 | 2013-06-26 | 浙江省电力公司电力科学研究院 | Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system |
| WO2015131602A1 (en) * | 2014-03-04 | 2015-09-11 | 国家电网公司 | Method for coordinating and controlling multi-terminal flexible direct current transmission system |
| CN104967141A (en) * | 2015-06-26 | 2015-10-07 | 许继电气股份有限公司 | Hybrid direct current transmission system |
| CN107565590A (en) * | 2017-09-06 | 2018-01-09 | 合肥工业大学 | The mixed high-voltage DC transmission system sent outside suitable for wind-powered electricity generation |
| CN109510231A (en) * | 2019-01-07 | 2019-03-22 | 兰州理工大学 | A kind of adaptive sagging control strategy of novel DC voltage |
-
2019
- 2019-05-09 CN CN201910382313.0A patent/CN110247415A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178539A (en) * | 2013-03-21 | 2013-06-26 | 浙江省电力公司电力科学研究院 | Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system |
| WO2015131602A1 (en) * | 2014-03-04 | 2015-09-11 | 国家电网公司 | Method for coordinating and controlling multi-terminal flexible direct current transmission system |
| CN104967141A (en) * | 2015-06-26 | 2015-10-07 | 许继电气股份有限公司 | Hybrid direct current transmission system |
| CN107565590A (en) * | 2017-09-06 | 2018-01-09 | 合肥工业大学 | The mixed high-voltage DC transmission system sent outside suitable for wind-powered electricity generation |
| CN109510231A (en) * | 2019-01-07 | 2019-03-22 | 兰州理工大学 | A kind of adaptive sagging control strategy of novel DC voltage |
Non-Patent Citations (1)
| Title |
|---|
| 于洋 等: "永磁直驱式风机采用混合直流并网的控制策略", 《中国电机工程学报》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108039726B (en) | Energy local area network distributed cooperative control method based on multi-agent system | |
| US11289905B2 (en) | Voltage and current control method and device for direct-current power transmission system | |
| CN104022522B (en) | A kind of coordination control method of multiterminal flexible direct current power transmission system | |
| CN108847680B (en) | Alternating current-direct current hybrid power distribution network layered control method based on flexible ring network device | |
| CN106786737B (en) | A kind of low voltage traversing control method for collecting and distributing type photovoltaic generating system | |
| CN112086995A (en) | Control strategy suitable for LCC-MMC hybrid cascade converter station parallel MMC unit | |
| WO2019075955A1 (en) | Coordination control method for input-parallel output-series direct current boost-based photovoltaic collection access system | |
| CN113452061A (en) | Offshore wind power direct current transmission system and control method thereof | |
| CN104079007A (en) | Distributed grid-connected photovoltaic power generation control method for inhibiting overvoltage of low-voltage feeder line | |
| CN104104101A (en) | Rapid power flow reversal control method for hybrid direct-current transmission | |
| CN105790300B (en) | A kind of wind turbine grid-connected system based on Hybrid HVDC | |
| CN106961113B (en) | Unified power flow controller system and converter reactive power control method | |
| CN111697612A (en) | Coordinated starting method of three-terminal hybrid direct-current power transmission system | |
| CN109713711B (en) | Voltage drop distributed photovoltaic inverter reactive power coordination control strategy | |
| US20210126462A1 (en) | Coordinated control method and device for series voltage source converter valve group | |
| CN110460083A (en) | LCC-VSC DC transmission system power coordination control method and device | |
| CN108110807B (en) | Multi-terminal flexible direct-current power grid converter station locking fault emergency control method | |
| CN117543690A (en) | Full-direct-current wind power grid-connected system based on energy cooperative control and alternating-current fault ride-through method | |
| CN108123467A (en) | A kind of adaptive droop control method of Multi-end flexible direct current transmission system DC voltage | |
| Tu et al. | Study on an novel multi-port energy router for AC-DC hybrid microgrid | |
| CN110247415A (en) | A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation | |
| CN114696373B (en) | Reactive power dispersion cooperative control method | |
| CN109301855A (en) | A kind of starting method and system of mixed high-voltage flexible direct current power grid | |
| CN107612013B (en) | Direct-current power grid voltage range control method | |
| CN105281369B (en) | Topological structure of wind power plant, and boost control method, device and system |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190917 |
|
| WD01 | Invention patent application deemed withdrawn after publication |