CN110460096A - A kind of fault traversing control method and device of the soft straight transmitting system of new energy isolated island - Google Patents
A kind of fault traversing control method and device of the soft straight transmitting system of new energy isolated island Download PDFInfo
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- CN110460096A CN110460096A CN201910727173.6A CN201910727173A CN110460096A CN 110460096 A CN110460096 A CN 110460096A CN 201910727173 A CN201910727173 A CN 201910727173A CN 110460096 A CN110460096 A CN 110460096A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
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- 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]
Abstract
The invention proposes a kind of energy storage devices and flexible direct current converter station to control mutually coordinated lower realization new energy fault traversing control method and device.For the soft straight power grid of the access new energy containing isolated island, cause transimission power limited when DC grid breaks down, signal (the voltage change on ac bus is controlled by previously given DC converter station, frequency variation etc.), energy storage device carries out quick real power control reduction to the impact of isolated island access new energy power station to ensure DC converter station nonoverload, then ability is sent out according to the given power of the DC grid after fault recovery, the power control system and energy storage device for starting new energy power station carry out power control together and reach balance with converter station capacity, realize fault traversing.The impact that new energy power station is accessed to isolated island can be reduced by quickly active adjust, while the control system of the converter station of DC grid is also very flexible, the two carries out cooperation and adjusts the effect that can effectively weaken failure.
Description
Technical field
The present invention relates to technical field of electric power system control, more particularly, to one kind based on flexible direct current converter station with
The fault traversing control method of the soft straight transmitting system of the new energy isolated island that energy storage device is mutually coordinated.
Background technique
Chinese energy resource and energy-consuming are very unbalanced, and energy abundance area is far from developed area, non-renewable energy
The few pattern of Xi Duodong is presented in Regional Distribution, China's overwhelming majority new energy concentrates on three backlands of northeast, North China, northwest
Area, and load center, in the southeastern coast in Zhejiang, Jiangsu, the new energy of enrichment largely needs to send outside.With Jiuquan 10,000,000 thousand
For watt wind power base, base is objectively required through UHV transmission apart from more than 800~3000 kilometers of Middle Eastern come real
Existing large capacity long distance power transmission, but as the ratio of synchronous Power Support gradually declines, or even stop exploitation, it studies flexible straight
Technology of transmission of electricity is flowed, and propose that power grid application flexible DC transmission technology solution large-scale wind power is sent outside to become following trend.
New energy does not need synchro source support, and isolated island accesses soft straight power grid, and control mode and fault traversing will face
Huge challenge, the grid-connected new energy unit of isolated island collects by exchange, accesses soft straight power grid after DC converting, so that new energy
Unit and flexible direct current power grid are asynchronous to the perception and response of failure, and after soft straight grid collapses, thousands of new
Energy unit is difficult to accurately the generation of perception failure in time and is quickly controlled accordingly, but still according to normal condition
Lower operation, issues power as usual, and at this time DC grid due to failure cause submitting ability reduce so that injection DC grid in
Power surplus, so as to cause DC converter station overload, DC grid collapse.
The extensive new energy development region in China is often in the end of power grid, and synchro source support is weak, it is difficult to realize big
The remote submitting of scale, and decoupled active and reactive is not needed the support of synchro source by flexible DC transmission when sending power outside,
One of the major way that future will be sent outside as extensive new energy.Especially due to the operation characteristic of DC grid and AC network
It is that fault response characteristics difference is very big, therefore no longer connects with AC network and be directly accessed its event of the new energy unit of soft straight power grid
Hinder the requirement passed through for fault traversing different with the fault traversing demand that is directly incorporated into AC network, under DC grid, closes
The problem of key is whether new energy unit can experience failure and limit power output in time, is rushed to reduce to DC converter station
It hits, saves DC grid from damage.
Extensive new energy accesses flexible direct current power grid using isolated island mode, and new energy unit is difficult to perceive soft straight electricity in time
The generation of net failure still issues power according to normal condition, will lead to DC converter station overload locking.In addition, current soft straight electricity
The protection of net is ms grades, and new energy unit is difficult to realize the emergent control to power within ms grades of time.
Summary of the invention
After the soft straight system jam of the access new energy power station containing isolated island, causes grid power superfluous, compel to be essential
The reactive power consumption that new energy injects is fallen, the invention proposes a kind of wind power plants in the case where isolated island accesses soft straight operation of power networks, storage
It can equipment and the mutually coordinated lower realization new energy fault traversing control method and device of flexible direct current converter station control.I.e. in the change of current
The exchange side stood configures certain energy storage device, after DC grid breaks down, issues signal, energy storage dress by DC converter station
It sets and quickly stores remaining power, and control the active of entire new energy power station simultaneously, then according to straight after fault recovery
The given power of galvanic electricity net sends out ability, together with new energy power station, active, the realization fault traversing of slow release storage.
Specifically, the present invention proposes that a kind of new energy isolated island mutually coordinated based on flexible direct current converter station and energy storage device is soft
The fault traversing control method of straight transmitting system is adjusted by DC converter station and energy storage device cooperation to realize new energy power station
The fault traversing of access, the described method comprises the following steps:
S1: the power that energy storage device needs to absorb is adjusted according to Parameters variation；
S2: failure occurs, and DC grid issues control signal；
S3: energy storage device carries out power control according to control signal during failure；
S4: after fault recovery, DC grid issues control target, and new energy power station carries out the Precise control of power, complete
At passing through.
Further,
In the step S1, adjusting the power that energy storage device needs absorb according to Parameters variation includes,
Frequency variation, the voltage change of exchange side are adjusted to determine the power for needing to absorb by direct current, provide letter
Number-Policy Table of power control.
Further,
The step S2 includes:
After direct current breaks down, DC converter station changes to start storage by voltage change, the frequency of control exchange side
It can device realization control.
Further,
In step S3,
Energy storage device is grid-connected under normal circumstances, but does not absorb power, after receiving the signal of DC converter station sending,
Startup power controls energy storage device immediately.
Further,
The power control is that power absorption value is determined according to the control scheme list pre-established.
Further,
In the step S3,
If line failure needs to cut off in DC grid, then the power of DC converter station is reduced, at this time DC converter
The voltage change stood through control ac bus, energy storage device then absorb power as requested.
Further,
The step S4 includes:
After DC grid fault recovery, DC grid passes through having to new energy power station according to itself concrete condition
Function control system issues instruction, and the Precise control of power is realized by the real power control system of new energy power station, reaches new energy
The matching of power and DC grid converter station capacity is issued, realizes that the failure of the new energy unit of isolated island access DC grid is worn
More.
The step S4 further comprises:
The real power control system of energy storage device and new energy power station is cooperated, and in time discharges the power of storage,
Energy storage is in light condition in time, is ready for next fault traversing.
The present invention also proposes a kind of soft direct sending of new energy isolated island mutually coordinated based on flexible direct current converter station with energy storage device
The fault traversing control device of system out characterized by comprising fault detection module, power adjusting module, control module and
Energy-storage module；
Fault detection module, for when DC grid breaks down, issuing control signal；
Power adjusts module, for adjusting the power that energy-storage module needs to absorb according to Parameters variation；
Control module receives the control signal when an error occurs, and according to the control signal, whole according to power
The setting valve that cover half block provides carries out power control to energy-storage module；After fault recovery, sent according to the power that DC grid gives
Output capacity, control energy-storage module complete fault traversing together with new energy power station；
Energy-storage module, configuration cooperate with DC converter station and adjust to realize that new energy power station connects in the exchange side of converter station
The fault traversing entered.
Further,
The power adjusts module and adjusts frequency variation, the voltage change of exchange side by direct current to determine the energy storage mould
Block needs the power absorbed, and provides signal-power control Policy Table.
Further,
After direct current breaks down, fault detection module issues control by the voltage change of control exchange side, frequency variation
Signal processed, and then start energy-storage module and realize control.
Further,
The energy-storage module is grid-connected under normal circumstances, but does not absorb power, former when being received by the control module
After hindering the signal that detection module issues, energy-storage module startup power is controlled immediately.
Further,
The power control is to adjust the control scheme list that module pre-establishes according to power to determine power absorption value.
Further,
If line failure needs to cut off in DC grid, then the power of DC converter station is reduced, at this time DC converter
The voltage change stood through control ac bus, energy storage device then absorb power as requested.
Further,
After DC grid fault recovery, DC grid passes through having to new energy power station according to itself concrete condition
Function control system issues instruction, and the Precise control of power is realized by the real power control system of new energy power station, reaches new energy
The matching of power and DC grid converter station capacity is issued, realizes that the failure of the new energy unit of isolated island access DC grid is worn
More.
Further,
The real power control system of the control device and new energy power station is cooperated, the function in time storing energy-storage module
Rate discharges, and energy-storage module is made to be in light condition, is ready for next fault traversing.
Method of the present invention is directed to the soft straight power grid of the access new energy containing isolated island, causes when DC grid breaks down
Transimission power is limited, and controlling the signal on ac bus by previously given DC converter station, (voltage change, frequency change
Deng), energy storage device carries out quick real power control reduction to the impact of isolated island access new energy power station to ensure DC converter station
Then nonoverload sends out ability according to the given power of the DC grid after fault recovery, starts the power control of new energy power station
System processed and energy storage device carry out power control together and reach balance with converter station capacity, realize fault traversing.
When DC Line Fault occurs for DC grid, energy storage device can be reduced by quickly active adjusting and access new energy to isolated island
The impact in source power station, while the control system of the converter station of DC grid is also very flexible, the two carries out cooperation adjusting can be effective
Weaken the effect of failure, realizes the fault traversing of new energy power station access.
Detailed description of the invention
Fig. 1 is fault ride-through method control flow chart of the present invention.
Fig. 2 is fault traversing schematic device of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
Personnel's every other embodiment obtained, shall fall within the protection scope of the present invention.
To achieve the above object, concrete scheme of the invention is as follows:
A kind of soft direct sending of new energy isolated island mutually coordinated based on flexible direct current converter station with energy storage device proposed by the present invention
The fault traversing control method of system, process are as shown in Figure 1 out.
It the described method comprises the following steps:
I, the power for needing to absorb according to control signal adjusting energy storage；
II, failure occur, and DC grid issues control signal；
Energy storage carries out power control according to control signal during III, failure；
After IV, fault recovery, direct current issues control target, and new energy power station carries out the Precise control of power, completes to wear
More.
Further, in the step I, the power that energy storage needs to absorb is adjusted according to control signal.
It needs energy storage device to make to timely feedback in view of DC grid breaks down, the interval of time may need to reach
Ms grades, thus the frequency variation of exchange side can be adjusted by direct current, voltage change determines the power to be absorbed, provide letter
Number-Policy Table of power control.
By taking voltage change as an example, draft the value of voltage change, after energy storage device experiences voltage change, directly initiate by
Power is absorbed according to corresponding Policy Table.It should be noted that the variation of associated voltage, cannot influence the normal fortune of new energy unit
Row.
Further, in the step II, failure occurs, and DC grid issues control signal.
After direct current breaks down, converter station can be changed by voltage change, the frequency of control exchange side come real at this time
Now achieve the purpose that starting energy storage device realizes control.
Further, in the step III, energy storage carries out power control according to control signal during failure.
Energy storage device is grid-connected under normal circumstances, but does not absorb power, after receiving the signal of DC converter station sending,
Startup power controls energy storage device immediately, and corresponding control is the absorption value according to the control scheme list and power pre-established.
If line failure needs to cut off in DC grid, then need to reduce the power of converter station, converter station is logical at this time
The voltage change of control ac bus is crossed, energy storage device then absorbs power as requested.
Further, in the step IV, after fault recovery, direct current issues control target, and new energy power station carries out power
Precise control, complete to pass through.
After DC grid fault recovery, DC grid is by according to the concrete condition of itself at this time, by giving new energy electricity
The real power control system stood issues instruction, and the Precise control of power is realized by the real power control system requirements of new energy power station,
Reach the matching that new energy issues power and DC grid converter station capacity, realizes the new energy unit of isolated island access DC grid
Fault traversing.
The real power control system of subsequent energy storage needs and new energy power station is cooperated, and in time releases the power of storage
It goes, energy storage is in light condition in time, is ready for fault traversing.
As shown in Fig. 2, a kind of fault traversing control device for realizing the above method that the present invention also proposes.Include:
Fault detection module, power adjusting module, control module and energy-storage module.
Fault detection module, for when DC grid breaks down, issuing control signal.
Power adjusts module, for adjusting the power that energy-storage module needs to absorb according to Parameters variation.
Control module receives the control signal when an error occurs, and according to the control signal, whole according to power
The setting valve that cover half block provides carries out power control to energy-storage module；After fault recovery, sent according to the power that DC grid gives
Output capacity, control energy-storage module complete fault traversing together with new energy power station.
Energy-storage module, configuration cooperate with DC converter station and adjust to realize that new energy power station connects in the exchange side of converter station
The fault traversing entered.
The power adjusts module and adjusts frequency variation, the voltage change of exchange side by direct current to determine the energy storage mould
Block needs the power absorbed, and provides signal-power control Policy Table.
After direct current breaks down, fault detection module issues control by the voltage change of control exchange side, frequency variation
Signal processed, and then start energy-storage module and realize control.
The energy-storage module is grid-connected under normal circumstances, but does not absorb power, former when being received by the control module
After hindering the signal that detection module issues, energy-storage module startup power is controlled immediately.
The power control is to adjust the control scheme list that module pre-establishes according to power to determine power absorption value.
If line failure needs to cut off in DC grid, then the power of DC converter station is reduced, at this time DC converter
The voltage change stood through control ac bus, energy storage device then absorb power as requested.
After DC grid fault recovery, DC grid passes through having to new energy power station according to itself concrete condition
Function control system issues instruction, and the Precise control of power is realized by the real power control system of new energy power station, reaches new energy
The matching of power and DC grid converter station capacity is issued, realizes that the failure of the new energy unit of isolated island access DC grid is worn
More.
The real power control system of the control device and new energy power station is cooperated, the function in time storing energy-storage module
Rate discharges, and energy-storage module is made to be in light condition, is ready for next fault traversing.
Applicant combines Figure of description to be described in detail and describe the embodiment of the present invention, but this field skill
Art personnel are it should be understood that above embodiments are only the preferred embodiments of the invention, and explanation is intended merely to help reader in detail
More fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on invention essence of the invention
Any improvement or modification made by mind should all be fallen within the scope and spirit of the invention.
Claims (16)
1. a kind of failure for the soft straight transmitting system of new energy isolated island mutually coordinated based on flexible direct current converter station with energy storage device is worn
More control method, which is characterized in that DC converter station and energy storage device cooperation adjust the failure to realize new energy power station access
It passes through, the described method comprises the following steps:
S1: the power that energy storage device needs to absorb is adjusted according to Parameters variation；
S2: failure occurs, and DC grid issues control signal；
S3: energy storage device carries out power control according to control signal during failure；
S4: after fault recovery, DC grid issues control target, and new energy power station carries out the Precise control of power, completes to wear
More.
2. the method as described in claim 1, which is characterized in that
In the step S1, adjusting the power that energy storage device needs absorb according to Parameters variation includes,
Frequency variation, the voltage change of exchange side are adjusted to determine the power for needing to absorb by direct current, provide signal-function
The Policy Table of rate control.
3. the method as described in claim 1, which is characterized in that
The step S2 includes:
After direct current breaks down, DC converter station changes to start energy storage and fill by voltage change, the frequency of control exchange side
Set realization control.
4. the method as described in claim 1, which is characterized in that
In step S3,
Energy storage device is grid-connected under normal circumstances, but does not absorb power, after receiving the signal of DC converter station sending, energy storage
Startup power controls device immediately.
5. method as claimed in claim 4, which is characterized in that
The power control is that power absorption value is determined according to the control scheme list pre-established.
6. method as claimed in claim 5, which is characterized in that
In the step S3,
If line failure needs to cut off in DC grid, then the power of DC converter station is reduced, DC converter station is logical at this time
The voltage change of control ac bus is crossed, energy storage device then absorbs power as requested.
7. method as claimed in claim 6, which is characterized in that
The step S4 includes:
After DC grid fault recovery, DC grid is according to itself concrete condition, by having power control to new energy power station
System processed issues instruction, and the Precise control of power is realized by the real power control system of new energy power station, reaches new energy sending
The fault traversing of the new energy unit of isolated island access DC grid is realized in the matching of power and DC grid converter station capacity.
8. the method for claim 7, which is characterized in that
The step S4 further comprises:
The real power control system of energy storage device and new energy power station is cooperated, and is in time discharged the power of storage, in time
Energy storage is in light condition, is ready for next fault traversing.
9. a kind of failure for the soft straight transmitting system of new energy isolated island mutually coordinated based on flexible direct current converter station with energy storage device is worn
More control device characterized by comprising fault detection module, power adjusting module, control module and energy-storage module；
Fault detection module, for when DC grid breaks down, issuing control signal；
Power adjusts module, for adjusting the power that energy-storage module needs to absorb according to Parameters variation；
Control module receives the control signal, and adjust mould according to the control signal, according to power when an error occurs
The setting valve that block provides carries out power control to energy-storage module；After fault recovery, energy is sent out according to the power that DC grid gives
Power, control energy-storage module complete fault traversing together with new energy power station；
Energy-storage module, configuration cooperate with DC converter station and adjust to realize new energy power station access in the exchange side of converter station
Fault traversing.
10. device as claimed in claim 9, which is characterized in that
The power adjusts module and adjusts frequency variation, the voltage change of exchange side by direct current to determine that the energy-storage module needs
The power to be absorbed, and provide signal-power control Policy Table.
11. device as claimed in claim 10, which is characterized in that
After direct current breaks down, fault detection module issues control letter by the voltage change of control exchange side, frequency variation
Number, and then start energy-storage module and realize control.
12. device as claimed in claim 11, which is characterized in that
The energy-storage module is grid-connected under normal circumstances, but does not absorb power, examines when receiving failure by the control module
After surveying the signal that module issues, energy-storage module startup power is controlled immediately.
13. device as claimed in claim 12, which is characterized in that
The power control is to adjust the control scheme list that module pre-establishes according to power to determine power absorption value.
14. device as claimed in claim 13, which is characterized in that
If line failure needs to cut off in DC grid, then the power of DC converter station is reduced, DC converter station is logical at this time
The voltage change of control ac bus is crossed, energy storage device then absorbs power as requested.
15. device as claimed in claim 14, which is characterized in that
After DC grid fault recovery, DC grid is according to itself concrete condition, by having power control to new energy power station
System processed issues instruction, and the Precise control of power is realized by the real power control system of new energy power station, reaches new energy sending
The fault traversing of the new energy unit of isolated island access DC grid is realized in the matching of power and DC grid converter station capacity.
16. device as claimed in claim 15, which is characterized in that
The real power control system of the control device and new energy power station is cooperated, and in time releases the power that energy-storage module stores
It runs out, energy-storage module is made to be in light condition, be ready for next fault traversing.
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| CN113394780A (en) * | 2021-07-21 | 2021-09-14 | 国网江苏省电力有限公司南通供电分公司 | Power control method and system for automatic port fault ride-through |
| CN113394780B (en) * | 2021-07-21 | 2022-08-19 | 国网江苏省电力有限公司南通供电分公司 | Power control method and system for automatic port fault ride-through |
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