CN109245147A - Accumulation energy type static synchronous compensating device and direct current transportation commutation failure suppressing method - Google Patents
Accumulation energy type static synchronous compensating device and direct current transportation commutation failure suppressing method Download PDFInfo
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- CN109245147A CN109245147A CN201811080063.7A CN201811080063A CN109245147A CN 109245147 A CN109245147 A CN 109245147A CN 201811080063 A CN201811080063 A CN 201811080063A CN 109245147 A CN109245147 A CN 109245147A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- 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 discloses a kind of accumulation energy type static synchronous compensating device and extra-high voltage direct-current transmission commutation failure suppressing methods, the large capacity accumulation energy type static synchronous compensating device is composed in parallel by more accumulation energy type static synchronous compensator, and the accumulation energy type static synchronous compensator (1) includes energy-storage units, DC/DC converter, capacitor and voltage source converter.Ac bus of the accumulation energy type static synchronous compensator through transformer access extra-high voltage DC transmission system receiving end converter station.Inductance is connected on the ac bus of the accumulation energy type static synchronous compensating device and receiving end converter station; the large capacity accumulation energy type static synchronous compensating device is run with voltage source mode; enough receiving end ac bus voltage supports can be provided for receiving end converter station; guarantee normal commutation; commutation failure caused by inhibit because of receiving end AC network failure, prevents commutation failure cascading failure caused by extra-high voltage DC transmission system.
Description
Technical field
The present invention relates to extra-high direct current transportation field, especially a kind of accumulation energy type static synchronous compensating device and extra-high straightening
Stream transmission of electricity commutation failure suppressing method.
Background technique
Commutation failure becomes extra-high voltage DC transmission system development as the DC transmission system system failure the most typical
One of great difficult problem faced.In transmission system inverter side, ac bus voltage declines, and voltage waveform caused by harmonic wave is abnormal
Become, DC current is uprushed, and the offset of commutation voltage zero crossing caused by asymmetrical three-phase failure may all cause commutation failure.Commutation
Unsuccessfully will lead to DC voltage decline, DC current increases in short-term, the unfavorable factors such as wave distortion, influence stablizing for system and transport
Row.Continuous commutation failure easily causes the drop volume operation of direct current system, D.C. magnetic biasing, protective relaying device malfunction, overvoltage,
Even cause valve group locking or pole locking, leads to dc power Transmission, seriously threaten the safe and stable operation of power grid, simultaneously
Also carry out lot of challenges to the control and protection band of alternating current-direct current mixing power grid.
In leading to HVDC commutation failure factors, AC network failure cause voltage decline be the most common factor it
One.Currently, being to improve voltage stability, inhibition HVDC system commutation failure most in receiving end converter station installation reactive power compensator
Effective means.Increase reactive power compensator, be equivalent to the effective short-circuit ratio for increasing receiving end AC system, reduces the equivalence electricity of system
It is anti-, thus reduce the commutation time, increase shutdown ampleness angle, avoids the generation of commutation failure.Currently, being suitable for the commutation of HVDC system
The common reactive power compensator that failure inhibits mainly includes synchronous capacitor (SC), shunt capacitor, Static Var Compensator
(SVC) and several forms such as static synchronous compensator (STATCOM).Synchronous capacitor is solution reactive power support ability in HVDC
Insufficient main means, SC are equivalent to the reactive power source of system in overexcited operation, idle to system output, make grid entry point
Busbar voltage increases；In underexcited operation, it is equivalent to inductive load, it is idle from system absorption, grid entry point busbar voltage drops
It is low.The short-time overload capacity of synchronous capacitor is strong, and the output reactive response time is most fast up to 20ms, but since it belongs to whirler
Tool, operation and maintenance are complicated, while HVDC system a possibility that there are still commutation failures.Static synchronous compensator SVC output is idle
It is adjustable, be lost that small, maintenance is simple, high reliablity, widely applied in power grid, but its that there are dynamic responding speed is opposite
It is big by grid voltage fluctuation influence compared with slow, output is idle, easily lead to the deficiencies of a large amount of harmonic pollution, cause SVC in HVDC system
Commutation failure of uniting inhibits field using less.
The fast response time of static synchronous compensator (STATCOM), range of operation is wide, device volume is small, easy to maintain, can
Fast and effeciently improve the quality of voltage of access point, thus it is more significant to the inhibitory effect of commutation failure.STATCOM is being applied
Biggish idle power output is usually required when HVDC system commutation failure inhibits, needs its DC bus capacitor value larger, and compared with
Big DC bus capacitor value will affect the performance of dynamic tracking of STATCOM；If STATCOM DC bus capacitor value is smaller, excessive
Idle power output will lead to DC voltage fluctuation amplitude it is excessive so that in idle output contain a large amount of harmonic wave, shadow
Output current quality is rung, furthermore the increase of harmonic wave inevitably results in the increase of STATCOM active loss, and then it is idle to weaken its
Compensation ability.Therefore there are output voltage current qualities to be influenced by DC bus capacitor value, idle output capacity is by electricity by STATCOM
Net voltage fluctuation influence is big, compensates only for the deficiencies of reactive power causes Network Voltage Stability effect undesirable, significantly limits
It inhibits the application in field in HVDC system commutation failure.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of accumulation energy type Static Synchronous benefit
Device and extra-high voltage direct-current transmission commutation failure suppressing method are repaid, can be provided for extra-high voltage direct-current transmission receiving end converter station enough
Busbar voltage support, to guarantee normal commutation, to inhibit the generation of commutation failure caused by receiving end electric network fault, prevents commutation
Failure cascading failure caused by system.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: it is a kind of for inhibiting the storage of commutation failure
Energy type static synchronous compensating device, including accumulation energy type static synchronous compensator and inductance；The accumulation energy type static synchronous compensator
Including energy-storage units, DC/DC converter, direct current capacitors, three-phase bridge voltage source type converter and AC transformer；The storage
Energy unit both ends are connected with DC/DC converter, and DC/DC converter both ends are connected with direct current capacitors, the DC capacitor
Device both ends are in parallel with three-phase bridge voltage source type converter, and the three-phase bridge voltage source type converter boosts through AC transformer
Afterwards in access receiving end ac bus in parallel, the inductance is connected on the accumulation energy type static synchronous compensating device and receiving end converter station
Ac bus on.
When receiving end power grid operates normally, the energy-storage units carry out energy storage and provide voltage support to receiving end power grid, and join
It is dispatched with the peak regulation of power grid；When receiving end electric network fault, the inductance receiving large capacity accumulation energy type for being connected on receiving end ac bus is quiet
The only voltage difference of synchronous compensator plant output voltage and receiving end network voltage, the large capacity accumulation energy type static synchronous compensating device
Voltage source mode is run on, and provides enough receiving end ac bus voltage for receiving end converter station, to guarantee normal commutation.
The three-phase bridge voltage source type converter is controlled using virtual synchronous machine；The stabilization of the DC capacitor voltage
It is controlled by the energy-storage units, by controlling the output power of three-phase bridge voltage source type converter, is realized to the energy storage list
The charge and discharge control of member.
The specific control process of the three-phase bridge voltage source type converter are as follows: the output electricity of acquisition virtual synchronous machine VSG
Pressure and electric current vabc、iabc, instantaneous power active-power P is calculated after the transformation of two-phase static coordinateeAnd reactive power Qe, gained wink
When active-power PeInput real power control module, gained instantaneous reactive power QeInput idle control module；Wherein, real power control
The control method of module are as follows: according to gained instantaneous active power PeCalculate real-time electromagnetic torque Te, with setting electromagnetic torque TsetMake
Difference simultaneously obtains torque error adjustment signal along with angular frequency adjusts component, further calculates out angular frequency signal ωv, by product
Point link (1/s) obtains real-time phase control signal θ；The control method of idle control module are as follows: according to real-time output voltage and
Voltage rating calculates reactive power reference instruction Qset, with instantaneous reactive power QeReactive power error adjustment signal is obtained as difference, is passed through
Integral element obtains real-time output voltage instruction Em；E is instructed according to real-time output voltagemIt is provided with real power control module real-time
Phase signal instructs θ, obtains the three-phase modulations wave signal of virtual synchronous machine, and then control in three-phase bridge voltage source type converter
Switching device switches off and on.
Compared with prior art, the advantageous effect of present invention is that: large capacity accumulation energy type of the present invention is quiet
Only synchronous compensator plant provides maximum support to network voltage in receiving end AC network failure, prevents extra-high voltage direct-current defeated
The commutation failure of electric system.When AC network operates normally, system is mainly used for peak load shifting, load balancing, the frequency modulation of power grid
Pressure regulation etc. promotes the security reliability of power grid.Energy storage technology is combined with virtual synchronous machine technology, for inhibiting commutation failure
It is of great significance with the safe and reliable operation for improving alternating current-direct current mixing power grid.
Detailed description of the invention
Fig. 1 is the system construction drawing of one embodiment of the invention；
Fig. 2 is the structure chart of the voltage source type converter of one embodiment of the invention；
Fig. 3 is the DC/DC transformer configuration figure of one embodiment of the invention；
Fig. 4 is the control strategy block diagram of the voltage source type converter of one embodiment of the invention；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Figure 1, large capacity accumulation energy type static synchronous compensating device includes accumulation energy type static synchronous compensator and inductance.
The accumulation energy type static synchronous compensator includes energy-storage units, DC/DC converter, direct current capacitors, three-phase bridge voltage-source type
Converter and AC transformer.
As shown in Figure 1, the energy-storage units both ends are connected with DC/DC converter, DC/DC converter both ends and direct current
Capacitor is connected, and the direct current capacitors both ends are in parallel with three-phase bridge voltage source type converter, the three-phase bridge voltage source
Code converter is boosted through transformer in access receiving end ac bus in parallel, and the inductance is connected on the accumulation energy type Static Synchronous and mends
Repay the ac bus of device Yu receiving end converter station.
Referring to fig. 2, using IGBT as the three-phase voltage type bridge inverter main circuit of switching device as shown in Fig. 2, its export
End is connected after LC filter with step-up transformer, and the high-pressure side of step-up transformer is in parallel with receiving end power grid.
Referring to Fig. 3, the topological structure of the DC/DC converter is buck/boost type circuit, according to detection three-phase voltage
The operating mode of the high low switching converter of source code converter DC capacitor voltage.When DC capacitor voltage is higher than rated capacity
When voltage, the topological structure of the DC/DC converter is buck mode, is charged to energy-storage units；Work as DC capacitor voltage
When lower than rated capacity voltage, the topological structure of the DC/DC converter is boost mode, energy-storage units electric discharge, by direct current
Container CdcVoltage is raised to rated value.
Referring to fig. 4, the three-phase bridge voltage source converter is controlled using virtual synchronous machine (VSG), by under tradition
Hang down control on the basis of introduce an inertial element, when so that outlet side disturbing, system can continue to original state after
For a moment, frequency, voltage responsive are more smooth for reforwarding row, largely increase the inertia of inverter.Secondly as VSG has
There is self synchronous function, the phase and amplitude for the adjust automatically output voltage that can contribute according to device is filled without additional phaselocked loop
Set, and when receiving end power grid disturbs, VSG by after the transient state motor synchronizing process of certain time, can in receiving end power grid
Synchronous generator output phase is consistent, and is avoided due to VSG and the inconsistent caused overcurrent tripping of receiving end grid phase.
As shown in figure 4, the output voltage and electric current v of acquisition VSGabc、iabc, calculated after the transformation of two-phase static coordinate instantaneous
Power active-power PeAnd reactive power Qe, gained instantaneous active power PeInput real power control module, gained instantaneous reactive power
QeInput idle control module.
Wherein, the control method of real power control module are as follows: according to gained instantaneous active power PeCalculate real-time electromagnetic torque
Te, with setting electromagnetic torque TsetMake difference and obtain torque error adjustment signal along with angular frequency adjusts component, further calculates
Angular frequency signal ω outv, real-time phase control signal θ is obtained by integral element (1/s).The control method of idle control module
Are as follows: reactive power is calculated according to real-time output voltage and voltage rating and refers to reference instruction Qset, with reactive power power QeIt is poor to make
Reactive power error adjustment signal is obtained, real-time output voltage is obtained by integral element and instructs Em.It is provided according to reactive controller
Real-time output voltage instructs EmThe real-time phase signal instruction θ provided with real power control module, obtains the three-phase of virtual synchronous machine
Modulation wave signal, and then control switching device in inverter and switch off and on.
When receiving end power grid operates normally, the large capacity accumulation energy type static synchronous compensating device stores up energy-storage units
Can and voltage support be provided to receiving end power grid, and participates in the peak regulation scheduling of power grid；When receiving end electric network fault, it is connected on receiving end friendship
The inductance for flowing bus bears the voltage difference of large capacity accumulation energy type static synchronous compensating device output voltage and receiving end network voltage, institute
It states large capacity accumulation energy type static synchronous compensating device and runs on voltage source mode, and provide enough receiving ends for receiving end converter station and hand over
Busbar voltage is flowed to guarantee normal commutation.
Claims (4)
1. a kind of accumulation energy type static synchronous compensating device, which is characterized in that including accumulation energy type static synchronous compensator and inductance；Institute
Stating accumulation energy type static synchronous compensator includes energy-storage units, and DC/DC converter, direct current capacitors, three-phase bridge voltage-source type become
Parallel operation and AC transformer；The energy-storage units both ends are connected with DC/DC converter, DC/DC converter both ends and direct current
Capacitor is connected, and the direct current capacitors both ends are in parallel with three-phase bridge voltage source type converter, the three-phase bridge voltage source
Code converter is in parallel after AC transformer boosts to be accessed in receiving end ac bus, and it is static that the inductance is connected on the accumulation energy type
On the ac bus of synchronous compensator plant and receiving end converter station.
2. a kind of direct current transportation commutation failure suppressing method of accumulation energy type static synchronous compensating device described in claim 1, special
Sign is, when receiving end power grid operates normally, the energy-storage units carry out energy storage and provide voltage support to receiving end power grid, and participate in
The peak regulation of power grid is dispatched；When receiving end electric network fault, the inductance receiving large capacity accumulation energy type for being connected on receiving end ac bus is static
The voltage difference of synchronous compensator plant output voltage and receiving end network voltage, the large capacity accumulation energy type static synchronous compensating device fortune
Row provides enough receiving end ac bus voltage in voltage source mode, and for receiving end converter station, to guarantee normal commutation.
3. according to the method described in claim 2, it is characterized in that, the three-phase bridge voltage source type converter is using virtual same
The control of step machine；The stabilization of the DC capacitor voltage is controlled by the energy-storage units, by controlling three-phase bridge voltage-source type
The output power of converter realizes the charge and discharge control to the energy-storage units.
4. according to the method described in claim 3, it is characterized in that, the specific control of the three-phase bridge voltage source type converter
Process are as follows: the output voltage and electric current v of acquisition virtual synchronous machine VSGabc、iabc, calculated after the transformation of two-phase static coordinate instantaneous
Power active-power PeAnd reactive power Qe, gained instantaneous active power PeInput real power control module, gained instantaneous reactive power
QeInput idle control module；Wherein, the control method of real power control module are as follows: according to gained instantaneous active power PeIt calculates real
When electromagnetic torque Te, with setting electromagnetic torque TsetMake difference and obtain torque error adjustment signal along with angular frequency adjusts component,
Further calculate out angular frequency signal ωv, real-time phase control signal θ is obtained by integral element (1/s)；Idle control module
Control method are as follows: reactive power reference instruction Q is calculated according to real-time output voltage and voltage ratingset, with instantaneous reactive power
QeReactive power error adjustment signal is obtained as difference, real-time output voltage is obtained by integral element and instructs Em；According to real-time output voltage
Instruct EmThe real-time phase signal instruction θ provided with real power control module, obtains the three-phase modulations wave signal of virtual synchronous machine, into
And control switching off and on for switching device in three-phase bridge voltage source type converter.
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| CN110556842A (en) * | 2019-09-16 | 2019-12-10 | 湖南大学 | Control method of direct-drive wind power plant inductive weak grid-connected subsynchronous oscillation suppression device |
| CN110661274A (en) * | 2019-09-29 | 2020-01-07 | 国网山东省电力公司电力科学研究院 | Composite dynamic power support system and coordination control method thereof |
| CN110676867A (en) * | 2019-10-15 | 2020-01-10 | 湖南大学 | Direct-current power transmission continuous commutation failure suppression method considering phase angle jump |
| CN111009916A (en) * | 2019-12-04 | 2020-04-14 | 深圳供电局有限公司 | Method for inhibiting direct current continuous commutation failure |
| CN111786396A (en) * | 2020-07-10 | 2020-10-16 | 国网湖南省电力有限公司 | High-voltage direct-current power transmission system commutation failure suppression method based on energy storage type chain STATCOM |
| CN111987732A (en) * | 2019-05-22 | 2020-11-24 | 中国电力科学研究院有限公司 | Electric energy exchanger and method suitable for flexible interconnection of feeder lines of power distribution network |
| CN112825429A (en) * | 2019-11-20 | 2021-05-21 | 江苏方天电力技术有限公司 | Direct-current continuous commutation failure suppression method based on phase modulation operation capability of inverter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987732A (en) * | 2019-05-22 | 2020-11-24 | 中国电力科学研究院有限公司 | Electric energy exchanger and method suitable for flexible interconnection of feeder lines of power distribution network |
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| CN110661274A (en) * | 2019-09-29 | 2020-01-07 | 国网山东省电力公司电力科学研究院 | Composite dynamic power support system and coordination control method thereof |
| CN110661274B (en) * | 2019-09-29 | 2021-06-15 | 国网山东省电力公司电力科学研究院 | Composite dynamic power support system and coordination control method thereof |
| CN110676867A (en) * | 2019-10-15 | 2020-01-10 | 湖南大学 | Direct-current power transmission continuous commutation failure suppression method considering phase angle jump |
| CN110676867B (en) * | 2019-10-15 | 2023-04-18 | 湖南大学 | Direct-current power transmission continuous commutation failure suppression method considering phase angle jump |
| CN112825429A (en) * | 2019-11-20 | 2021-05-21 | 江苏方天电力技术有限公司 | Direct-current continuous commutation failure suppression method based on phase modulation operation capability of inverter |
| CN111009916A (en) * | 2019-12-04 | 2020-04-14 | 深圳供电局有限公司 | Method for inhibiting direct current continuous commutation failure |
| CN111009916B (en) * | 2019-12-04 | 2023-10-24 | 深圳供电局有限公司 | Method for inhibiting direct current continuous commutation failure |
| CN111786396A (en) * | 2020-07-10 | 2020-10-16 | 国网湖南省电力有限公司 | High-voltage direct-current power transmission system commutation failure suppression method based on energy storage type chain STATCOM |
| CN111786396B (en) * | 2020-07-10 | 2023-12-12 | 国网湖南省电力有限公司 | Phase-change failure suppression method for high-voltage direct-current transmission system based on energy storage type chained STATCOM |
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