CN110365024A - A kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid - Google Patents
A kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid Download PDFInfo
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- CN110365024A CN110365024A CN201910560811.XA CN201910560811A CN110365024A CN 110365024 A CN110365024 A CN 110365024A CN 201910560811 A CN201910560811 A CN 201910560811A CN 110365024 A CN110365024 A CN 110365024A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000002401 inhibitory effect Effects 0.000 title claims description 12
- 230000009471 action Effects 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 abstract description 8
- 238000011217 control strategy Methods 0.000 abstract description 5
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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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
- H02J3/12—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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H02J3/386—
-
- 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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses the emergency control methods that a kind of inhibition direct-current commutation failure causes sending end blower off-grid, using direct-current commutation failure as emergent control entry condition, fall control zone as criterion using blower set end voltage, according to the control zone that blower generator terminal is fallen match it is different it is low wear active and reactive control strategy, the failure of blower low voltage crossing can be effectively prevent or transient overvoltage is excessively high leads to the unordered off-grid of blower to cause the risk of the extensive blower off-grid of sending end.
Description
Technical field
The invention belongs to electric system and fields of automation technology, specifically, the present invention relates to a kind of inhibition direct current commutations
Unsuccessfully cause the emergency control method of sending end blower off-grid.
Background technique
Using northwest Qi Shao direct current as the extra-high voltage direct-current wind-powered electricity generation delivery system of representative, sending end near region large-scale wind power is carried
Concentrate the demand sent out.On the one hand, the mating reinforcement rack of direct current seriously lags, direct current near region Net Frame of Electric Network weakness, voltage support
Scarce capacity, on the other hand, due to Wind turbines, wind power base dynamic reactive compensation device voltage adjustment characteristic is complicated, controls target
Dispersion lacks coordinated control, and wind power base is integrally presented in the opposite voltage adjustment characteristic of normal power supplies in actual electric network, and power grid adapts to
Property is not strong.It is easy to cause blower set end voltage transient state pressure near region to rise under DC high-power transport condition, after direct-current commutation failure
Greatly, lead to extensive blower off-grid, it is understood that there may be the risk of mains breakdown.Simulation analysis is also indicated that with practical operating experiences, special
That there are wind power outputs is bigger for the weak sending end of high voltage direct current, and Wind turbines transient overvoltage problem near region is tighter after direct-current commutation failure
Weight, is so limited, and wind power output is bigger to have " seesaw " relationship with direct current transportation ability, seriously constrain extra-high voltage direct-current across
The ability of area's consumption new energy.
Currently, being primarily upon the accident development process as caused by ac short circuit failure for the analysis of blower off-grid.With
Extra-high voltage direct-current wind power base delivery system quickly puts into operation, simulation calculation and actual motion discovery, the exchange of receiving end converter station near region
After short trouble causes direct current that commutation failure occurs, causes sending end voltage that " high after first low " characteristic is presented, can be made under serious conditions
At a large amount of blower off-grids of sending end power grid.Comparison analysis, which is emulated, based on physical fault recording curve finds that direct-current commutation failure causes
The main reason for wind power plant transient overvoltage by following two points, 1) the idle surplus of DC converter station filter；2) Wind turbines are low
Active reduction during wearing, out it is low wear it is rear it is idle have little time to retract, cause the idle a large amount of surpluses of major network.
Summary of the invention
The purpose of the present invention is to provide the emergent control sides that a kind of inhibition direct-current commutation failure causes sending end blower off-grid
Method matches different urgent controls according to the control zone that blower generator terminal is fallen using direct-current commutation failure as emergent control entry condition
System strategy can effectively prevent blower to wear failure because high and low and cause the unordered off-grid of blower to which to cause the extensive blower of sending end chain
The risk of off-grid.
In order to achieve the above objectives, realization that the present invention adopts the following technical solutions:
A kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid, comprising the following steps:
1) the Voltage Drop setting valve of wind farm grid-connected Voltage Drop triggering control action is determined；
2) it is required to mark control action area on curve in wind power plant low voltage crossing according to the Voltage Drop setting valve；
3) according to the control action area, formulate it is low wear idle control measure and it is low wear real power control measure, and determine every
The actuation time of one control measure；
4) according to the direct-current commutation failure information received, wind park control station starts emergent control measure；
5) more wind farm grid-connected voltage trace and wind power plant low voltage crossing require curve, when wind farm grid-connected point electricity
Pressure track is continuously fallen in control action area after a certain period of time, implements corresponding control measure according to the control action area at place.
The Voltage Drop setting valve of wind farm grid-connected Voltage Drop triggering control action of determination above-mentioned, comprising:
According to grid operation mode, electric network model, parameter and forecast failure collection, electricity net safety stable assessment is carried out, with electricity
Net that different racks are strong and weak, under the booting of direct current near region Wind turbines, after extra-high voltage direct-current commutation failure, blower will not because of it is low wear,
It is target that height, which wears unsuccessfully off-grid, determines Voltage Drop setting valve.
Control action Division above-mentioned are as follows:
Vref1≤Vpcc< 0.9 is control action area I, Vref2≤Vpcc< Vref1For control action area II, 0.2≤Vpcc<
Vref2For control action area III,
Wherein, VpccFor wind farm grid-connected voltage, Vref1And Vref2For Voltage Drop setting valve.
It is above-mentioned low to wear idle control measure are as follows:
It is described low to wear real power control measure are as follows:
It is described low to wear idle control measure and low wear real power control measure and must satisfy:
Wherein, IqReactive current during being worn for Wind turbines are low, IdWind turbines are low to wear period watt current, INFor wind-powered electricity generation
Field rated current, Id0Watt current value when for wind power plant steady-state operation, k1,k2,k3,k4,k5,k6For response coefficient, meet k4<
k5< k6, k1> k2> k3。
The actuation time of control measure above-mentioned is 20ms~30ms.
Direct-current commutation failure information above-mentioned is sent to direct-current commutation failure information substation by DC control and protection system, then
It is sent to wind park control station；Direct-current commutation failure information substation is using the substation in grid control system.
Wind farm grid-connected voltage trace above-mentioned monitors acquisition by the measure and control device for being mounted on wind power plant in real time.
In aforementioned step 5), certain time refers to the actuation time of control measure.
The beneficial effects obtained by the present invention are as follows are as follows:
Using the method for the present invention can effectively prevent blower low voltage crossing failure or transient overvoltage it is excessively high cause blower without
Sequence off-grid is to cause the risk of the extensive blower off-grid of sending end.
Detailed description of the invention
Fig. 1 is China's " wind power plant accesses power system technology regulation " about the requirement of wind power plant low voltage crossing；
Fig. 2, which is that wind power plant of the present invention is low, wears control program schematic diagram；
Fig. 3, which is that wind power plant of the present invention is low, wears control program flow chart.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
The present invention provides a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid, including following
Content:
1) according to grid operation mode, electric network model, parameter and forecast failure collection, electricity net safety stable assessment is carried out, really
The Voltage Drop setting valve V of fixed wind farm grid-connected Voltage Drop triggering control actionref1And Vref2.According to the setting valve in wind
Electric field low voltage crossing requires to mark control action area on curve, and determines the actuation time of each single item control measure.
In the present invention, grid operation mode mainly includes that Present Thermal Power unit is switched on, direct current near region Wind turbines are switched on, straight
Flow different operation power etc..
In the present invention, electric network model refers to grid generator model, DC Model, load model, new energy model, SVC
Dynamic passive compensation model etc..Parameter is the parameter itself and control parameter of the devices such as generator in power grid, route, transformer,
These parameters are all relatively-stationary.
Forecast failure includes any exchange N-1/N-2 failure, the DC Line Fault that power grid may occur, present invention is generally directed to
Be direct-current commutation failure failure.
Wind turbines set end voltage has itself low, high voltage protection definite value, low-voltage variation such as Fig. 1, if voltage during failure
Variation breaks through protection definite value blower will off-grid.In existing air-blower control strategy, wind power plant low voltage crossing require curve referring to
Fig. 1, no matter blower falls to any not off-grid region in Fig. 1, and watt current, the reactive current of blower hair are consistent, and the present invention is herein
On the basis of delimit 3 regions, blower voltage falls different zones, it is low wear during watt current, reactive current it is different, i.e. Fig. 2.
Voltage Drop setting valve is assessed by electricity net safety stable and is realized: different DC operation power, different direct currents near region
Under wind-powered electricity generation booting, different thermoelectricity bootings, the degree for causing blower set end voltage to fall after direct-current commutation failure failure is different, falls
Seriously meeting low-voltage off-grid, to slow down itself hair reactive power support after the present new energy enterprise mark regulation blower voltage of Voltage Drop falls
Network voltage.
How much the idle amount sent out during blower low-voltage will affect overvoltage after system voltage restores again, and hair will cause too much
Major network is idle, and surplus will cause blower transient overvoltage off-grid.
Control strategy proposed by the present invention is exactly to want by amount active and reactive during optimizing low wear, and makes blower direct current commutation
After failure will not because of hair idle during blower low pressure few low pressure off-grid, idle will not cause wind because of multiple during low wear
Machine high pressure off-grid.
Control action Division is as follows: calculating strong and weak, the direct current near region wind with power grid difference rack according to offline time-domain-simulation
Motor group booting under, after extra-high voltage direct-current commutation failure, blower will not because of it is low wear, height wear unsuccessfully off-grid be target, determine wind
Motor group Voltage Drop setting valve Vref1And Vref2, delimit corresponding control action area.
Control action Division are as follows: Vref1≤Vpcc< 0.9 is control action area I, Vref2≤Vpcc< Vref1For control action
Area II, 0.2≤Vpcc< Vref2For control action area III.
The blower will not because of it is low wear, height wear unsuccessfully off-grid be target, be by optimize direct-current commutation failure cause closely
Area's blower enters low active and reactive control strategy when wearing, and prevents the failure of blower low voltage crossing or transient overvoltage is excessively high leads
Cause the unordered off-grid of blower to cause the extensive blower off-grid of sending end.
Existing blower is low to wear control strategy, and active instantaneous reduction even drops to 0, reactive current Iq=k* (0.9-Vpcc)IN,
Direct-current commutation failure causes receiving end blower set end voltage to fall, and deeper injected system reactive current is bigger, and low wear terminates rear fan hair
It is more that idle rollback out will cause the idle surplus of major network not in time, after failure caused by blower transient overvoltage it is more serious.This
Invention carries out stepping into the active and reactive control measure after low wear group are entered to wind-powered electricity generation, Low Dropout caused by commutation failure
It is deeper, control watt current I during low weardBigger, it is idle to consume part, controls reactive current IqIt is smaller, it is low out to wear rear wind
Motor group is fewer because of the idle profit margin of idle rollback not in time.
Control measure are as follows:
Wherein, IqReactive current during being worn for Wind turbines are low, IdWind turbines are low to wear period watt current, INFor wind-powered electricity generation
Field rated current, VpccFor wind farm grid-connected voltage, Id0Watt current value when for wind power plant steady-state operation, k1,k2,k3,k4,
k5,k6For response coefficient, respective value, and k can be determined according to actual electric network4< k5< k6, k1> k2> k3。
2) by being mounted on the measure and control device of wind power plant, the rail that wind farm grid-connected voltage changes over time is monitored in real time
Mark.
3) using the substation in grid control system as direct-current commutation failure information substation, DC control protection system is received
The direct-current commutation failure information issued of uniting is changed direct current by direct-current commutation failure information substation when commutation failure occurs for direct current
Phase failure information is sent to wind park control station, and wind park control station starts emergent control measure.
4) wind park control station is by wind farm grid-connected voltage trace and the mentioned wind power plant low voltage crossing requirement of the present invention
Curve carries out analysis comparison.
5) reach after a certain period of time when wind farm grid-connected voltage trace is continuously fallen in control action area, according to corresponding wind
Machine control measure actively implement idle emergent control.The duration is usually 20ms~30ms.
Referring to fig. 2, in the present invention, when wind farm grid-connected voltage trace is fallen in control action area I and reaches a timing
Between after, actively implement emergent control by control measure 1；When wind farm grid-connected voltage trace is fallen in control action area II and is reached
To after a certain period of time, actively implement emergent control by control measure 2；When wind farm grid-connected voltage trace falls in control action area
In III and reach after a certain period of time, actively implements emergent control by control measure 3.
6) return step 2).
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid, which is characterized in that including following
Step:
1) the Voltage Drop setting valve of wind farm grid-connected Voltage Drop triggering control action is determined；
2) it is required to mark control action area on curve in wind power plant low voltage crossing according to the Voltage Drop setting valve；
3) according to the control action area, formulate it is low wear idle control measure and it is low wear real power control measure, and determine each single item
The actuation time of control measure；
4) according to the direct-current commutation failure information received, wind park control station starts emergent control measure；
5) more wind farm grid-connected voltage trace and wind power plant low voltage crossing require curve, when wind farm grid-connected Voltage rails
Mark is continuously fallen in control action area after a certain period of time, implements corresponding control measure according to the control action area at place.
2. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 1,
It is characterized in that, the Voltage Drop setting valve of wind farm grid-connected Voltage Drop triggering control action of the determination, comprising:
According to grid operation mode, electric network model, parameter and forecast failure collection, electricity net safety stable assessment is carried out, not with power grid
Under, Wind turbines booting in direct current near region strong and weak with rack, after extra-high voltage direct-current commutation failure, blower will not because of it is low wear, height is worn
Failure off-grid is target, determines Voltage Drop setting valve.
3. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 1,
It is characterized in that, the control action Division are as follows:
Vref1≤Vpcc< 0.9 is control action area I, Vref2≤Vpcc< Vref1For control action area II, 0.2≤Vpcc< Vref2For
Control action area III,
Wherein, VpccFor wind farm grid-connected voltage, Vref1And Vref2For Voltage Drop setting valve.
4. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 3,
Low idle control measure are worn it is characterized in that, described are as follows:
It is described low to wear real power control measure are as follows:
It is described low to wear idle control measure and low wear real power control measure and must satisfy:
Wherein, IqReactive current during being worn for Wind turbines are low, IdWind turbines are low to wear period watt current, INFor wind power plant volume
Constant current, Id0Watt current value when for wind power plant steady-state operation, k1,k2,k3,k4,k5,k6For response coefficient, meet k4< k5<
k6, k1> k2> k3。
5. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 4,
It is characterized in that, the actuation time of the control measure is 20ms~30ms.
6. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 1,
It is characterized in that, the direct-current commutation failure information is sent to direct-current commutation failure information substation by DC control and protection system,
It retransmits to wind park control station；Direct-current commutation failure information substation is using the substation in grid control system.
7. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 1,
It is characterized in that, the wind farm grid-connected voltage trace monitors acquisition by the measure and control device for being mounted on wind power plant in real time.
8. a kind of emergency control method for inhibiting direct-current commutation failure to cause sending end blower off-grid according to claim 1,
It is characterized in that, certain time refers to the actuation time of control measure in the step 5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910560811.XA CN110365024B (en) | 2019-06-26 | 2019-06-26 | Emergency control method for restraining sending-end fan off-line caused by direct-current commutation failure |
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| CN201910560811.XA CN110365024B (en) | 2019-06-26 | 2019-06-26 | Emergency control method for restraining sending-end fan off-line caused by direct-current commutation failure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039130A (en) * | 2020-08-05 | 2020-12-04 | 武汉大学 | Voltage constraint considered emergency control method for weak transmitting end power grid after direct current fault |
| CN112086971A (en) * | 2020-09-21 | 2020-12-15 | 国电南瑞南京控制系统有限公司 | Power grid emergency control method and system |
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| CN102035217A (en) * | 2010-12-21 | 2011-04-27 | 西北电网有限公司 | Control method for actively preventing simultaneous low-voltage tripping of sets in wind power field |
| CN109713668A (en) * | 2019-01-24 | 2019-05-03 | 国电南瑞科技股份有限公司 | A kind of new energy base direct current sends chain off-grid early warning and system of defense and method outside |
| CN109921399A (en) * | 2019-03-25 | 2019-06-21 | 中国电力科学研究院有限公司 | The control method and device of sending end power network overvoltage during a kind of inhibition commutation failure |
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2019
- 2019-06-26 CN CN201910560811.XA patent/CN110365024B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035217A (en) * | 2010-12-21 | 2011-04-27 | 西北电网有限公司 | Control method for actively preventing simultaneous low-voltage tripping of sets in wind power field |
| CN109713668A (en) * | 2019-01-24 | 2019-05-03 | 国电南瑞科技股份有限公司 | A kind of new energy base direct current sends chain off-grid early warning and system of defense and method outside |
| CN109921399A (en) * | 2019-03-25 | 2019-06-21 | 中国电力科学研究院有限公司 | The control method and device of sending end power network overvoltage during a kind of inhibition commutation failure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039130A (en) * | 2020-08-05 | 2020-12-04 | 武汉大学 | Voltage constraint considered emergency control method for weak transmitting end power grid after direct current fault |
| CN112086971A (en) * | 2020-09-21 | 2020-12-15 | 国电南瑞南京控制系统有限公司 | Power grid emergency control method and system |
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