CN104701855A - Emergency control method for reactive voltages of wind power plant - Google Patents
Emergency control method for reactive voltages of wind power plant Download PDFInfo
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- CN104701855A CN104701855A CN201510114541.1A CN201510114541A CN104701855A CN 104701855 A CN104701855 A CN 104701855A CN 201510114541 A CN201510114541 A CN 201510114541A CN 104701855 A CN104701855 A CN 104701855A
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- voltage
- energy turbine
- turbine set
- wind energy
- access point
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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
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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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- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to an emergency control method for reactive voltages of a wind power plant; the method comprises the following steps: (1) setting allowable operational ranges of voltages at a grid connection point and an access point of the wind power plant; (2) monitoring to real-timely acquire the voltages at the grid connection point and the access point of the wind power plant; (3) judging the voltage changes of the grid connection point and the access point of the wind power plant satisfy emergency control conditions; if so, carrying out the step (4); if not, returning to the step (3); (4) judging whether the voltage at the grid connection point of the wind power plant exceeds the allowable operational range; if so, emergently controlling the reactive voltage at the grid connection point of the wind power plant; if not, judging that the voltage at the access point of the wind power plant exceeds the allowable operational range, and emergently controlling the reactive voltage of the access point of the wind power plant; and (5) enabling the voltages at the grid connection point and the access point of the wind power plant to run in the allowable operational ranges by virtue of the emergency control of the reactive voltages of the grid connection point and the access point. Compared with the prior art, the method has the advantages of being good in control effect, advanced in technology and high in real-timeliness and the like.
Description
Technical field
The present invention relates to Electric control field, especially relate to a kind of wind power plant reactive voltage emergency control method.
Background technology
Due to the characteristic of wind-resources distribution, enrich region power load less for wind-resources, general wind energy turbine set is sent to load center by superhigh pressure, remote conveying electric channel electricity of keeping watch.One of supergrid very outstanding feature be exactly that there is very high charge power, a large amount of charge powers not only makes extra high voltage system voltage higher, and be connected in series to wind farm grid-connected point by the superhigh pressure main transformer of wind power base, the voltage of wind farm grid-connected point is caused to having a strong impact on.Due to fluctuation and the uncertainty of wind power output, the fluctuation that goes out of Large Scale Wind Farm Integration directly affects the trend of EHV transmission passage and the change of reactive loss, cause the charge power of extra high voltage network to fluctuate widely, cause the big rise and big fall of regional power grid and wind farm group access point voltage.When Large Scale Wind Farm Integration group entirety go out force level higher time, wind-powered electricity generation passway for transmitting electricity voltage reduces because reactive loss rolls up, when Large Scale Wind Farm Integration group entirety go out force level lower time, wind-powered electricity generation output channel reactive loss is smaller, and a large amount of charge powers makes system voltage higher.In order to ensure Network Voltage Stability, according to relevant regulations, supertension line must install a large amount of high resistances in parallel and low resisting compensates supertension line charge power.
When wind farm grid-connected point, wind energy turbine set access point reactive voltage regulate and exceed its normal control ability, need the emergency control of carrying out reactive voltage.
1) under extreme wind weather condition, meritorious the exerting oneself of wind energy turbine set may be very high even close to rated output, in this case, the trend heavy duty that wind-powered electricity generation sends passage makes System Reactive Power loss obviously increase, cause system voltage because of idle deficiency degradation, even far below rated voltage.If when now Reactive-power control exceeds its means, needing takes urgent measure controls system voltage, causes system voltage to collapse to prevent brownout.
2) when there is large disturbances in regional power grid, wind energy turbine set access point and regional power grid voltage will sharply reduce or raise, if take effective control measure not in time, the serious consequences such as the extensive off-grid of wind farm group, system unstability, area power grid voltage collapse may be caused.
3) when operation of power networks is under rich little mode, wind farm grid-connected point, wind energy turbine set access point and regional power grid voltage may be seriously higher, even likely exceed voltage and run the permission upper limit, if now do not take emergency control measure, the insulation of system will be jeopardized, have a strong impact on system stability.
Above-mentioned wind farm grid-connected point and wind energy turbine set access point because of various special circumstances voltage seriously higher or on the low side time, emergency control measure should be taked to control voltage.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and the wind power plant reactive voltage emergency control method that a kind of control effects is good, advanced technology, real-time are high is provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of wind power plant reactive voltage emergency control method, comprises the following steps:
1) the permission range of operation of also site and the access point voltage of wind energy turbine set is set;
2) by the voltage of also site and the access point of monitoring Real-time Obtaining wind energy turbine set;
3) judge whether the change in voltage of also site and the access point of wind energy turbine set meets the condition of emergency control, if so, then carry out step 4), if not, then return step 2);
4) when determining whether that the grid-connected point voltage of wind energy turbine set exceeds permission range of operation, if so, the also site reactive voltage emergency control of wind energy turbine set is then carried out, if not, then for the access point voltage of wind energy turbine set exceeds permission range of operation, carry out the access reactive voltage emergency control of wind energy turbine set;
5) by and the reactive voltage emergency control of site and access point make wind energy turbine set and site and access point voltage run in permission range of operation.
The permission range of operation of the grid-connected point voltage of described wind energy turbine set is 0.97U
n~ 1.07U
n, the permission range of operation of the access point voltage of described wind energy turbine set is 1.0U
n~ 1.067U
n.
Described step 3) in the condition meeting emergency control be wind energy turbine set and site and access point voltage exceed and allow range of operation to run certain hour, and all Reactive-power control equipment puts into operation.
Described step 4) in wind energy turbine set and site reactive voltage emergency control specifically comprise the following steps:
41) when the grid-connected point voltage of wind energy turbine set is less than 0.97U
ntime, the secondary load of cut-out, and the Wind turbines on the feeder line that the idle characteristic of preferential excision is poor and electrical distance is far away;
42) when the grid-connected point voltage when wind energy turbine set is greater than 1.07U
ntime, by the concentrated access point of wind energy turbine set and electric brake off-the-line.
Described step 4) in the access point reactive voltage emergency control of wind energy turbine set specifically comprise the following steps:
43) when wind energy turbine set access point voltage is less than 1.0U
ntime, the secondary load of cut-out, sends cutting machine signal by wind energy turbine set main website, excises the Wind turbines on idle characteristic difference and electrical distance feeder line far away;
44) when wind energy turbine set access point voltage is greater than 1.067U
ntime, access point excises a 220kV wind-powered electricity generation and sends circuit.
Described Reactive-power control equipment comprises secondary capacitor, voltage reactor and SVG.
Compared with prior art, the present invention has the following advantages:
One, control effects is good: this method can tackle wind energy turbine set access electricity and grid-connected point voltage is in urgent state, the mode of circuit is sent by wind cutting group of motors, cutting load and excision 220kV wind-powered electricity generation, by wind energy turbine set access point and and the voltage stabilization of site in permission range of operation, and then meet the safety standard of national grid.
Two, advanced technology, real-time are high: this method by Real-Time Monitoring obtain wind energy turbine set access electricity and and the voltage of site, judge whether windfarm system is in a state of emergency in conjunction with to the monitoring of idle control device.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is that large-scale wind power access electric network reactive-load voltage integrated controls schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
As shown in Figure 1, a 1. wind power plant reactive voltage emergency control method, comprises the following steps:
1) set the permission range of operation of also site and the access point voltage of wind energy turbine set, the permission range of operation of the grid-connected point voltage of wind energy turbine set is 0.97U
n~ 1.07U
n, the permission range of operation of the access point voltage of described wind energy turbine set is 1.0U
n~ 1.067U
n;
2) by the voltage of also site and the access point of monitoring Real-time Obtaining wind energy turbine set;
3) judge whether the change in voltage of also site and the access point of wind energy turbine set meets the condition of emergency control, this condition is that also site and the access point voltage of wind energy turbine set exceeds permission range of operation operation certain hour, and all Reactive-power control equipment, comprise secondary capacitor, voltage reactor and SVG all to put into operation, if, then carry out step 4), if not, then return step 2);
4) when determining whether that the grid-connected point voltage of wind energy turbine set exceeds permission range of operation, if so, the also site reactive voltage emergency control of wind energy turbine set is then carried out, if not, then for the access point voltage of wind energy turbine set exceeds permission range of operation, carry out the access reactive voltage emergency control of wind energy turbine set;
The also site reactive voltage emergency control of wind energy turbine set specifically comprises the following steps:
41) when the grid-connected point voltage of wind energy turbine set is less than 0.97U
ntime, the secondary load of cut-out, and the Wind turbines on the feeder line that the idle characteristic of preferential excision is poor and electrical distance is far away;
42) when the grid-connected point voltage when wind energy turbine set is greater than 1.07U
ntime, by the concentrated access point of wind energy turbine set and electric brake off-the-line;
The access point reactive voltage emergency control of wind energy turbine set specifically comprises the following steps:
43) when wind energy turbine set access point voltage is less than 1.0U
ntime, the secondary load of cut-out, sends cutting machine signal by wind energy turbine set main website, excises the Wind turbines on idle characteristic difference and electrical distance feeder line far away;
44) when wind energy turbine set access point voltage is greater than 1.067U
ntime, access point excises a 220kV wind-powered electricity generation and sends circuit;
5) by and the reactive voltage emergency control of site and access point make wind energy turbine set and site and access point voltage run in permission range of operation.
The wind farm group determined according to one-level reactive power/voltage control and secondary reactive power/voltage control the voltage of site and wind energy turbine set access point run allowed band: wind farm grid-connected some 0.97U
n~ 1.07U
n, wind energy turbine set access point 1.0U
n~ 1.067U
n, when voltage exceeds above-mentioned voltage operation allowed band, and when Reactive-power control equipment all puts into operation, take measures to carry out urgent reactive power/voltage control.
The measure of reactive voltage emergency control generally comprises: cut-out Wind turbines or power load.Excision Wind turbines mode is taked to carry out cutting machine in units of feeder line, the Wind turbines that preferential excision distance booster stations electrical distance is far away; Cut-away area grid parts load mainly relies on low-voltage load sheding device, first excises inessential load in voltage minimum point; When output of wind electric field level is extremely low, a large amount of charge power crossfire of supertension line makes overtension to wind farm group access point, when wind farm group access point voltage is higher than 1.07U
ntime, be protection wind energy turbine set, at wind farm group access point wind energy turbine set and grid disconnection.When wind farm group access point voltage is higher than 1.067U
ntime, when confirming that Reactive-power control equipment is used up, excise a 220kV wind-powered electricity generation and send circuit.
As shown in Figure 2, when system is normally run, adopt secondary reactive voltage cooperation control, control program is as follows:
One-level controls to be completed by transformer station's supervisory system of closed of wind farm grid-connected point, controls on the spot primarily of the SVG of wind farm grid-connected point or capacity reactance device, and a distant place controls group of motors of giving a dinner for a visitor from afar and carries out reactive power/voltage control.
Two-stage control is completed by regional power grid main website, adopts decision-premaking and the mode controlling in real time to combine in advance, is controlled on the spot to complete with coordination between the two by the reactive voltage of wind farm grid-connected point and regional power grid.
Under extreme case: the urgent reactive power/voltage control of electrical network
Wind-powered electricity generation concentrates the reactive voltage emergency control of access electrical network, mainly takes to set up automatic safety device to realize, and major measure comprises wind cutting group of motors, cutting load and an excision 220kV wind-powered electricity generation and sends circuit.
Claims (6)
1. a wind power plant reactive voltage emergency control method, is characterized in that, comprises the following steps:
1) the permission range of operation of also site and the access point voltage of wind energy turbine set is set;
2) by the voltage of also site and the access point of monitoring Real-time Obtaining wind energy turbine set;
3) judge whether the change in voltage of also site and the access point of wind energy turbine set meets the condition of emergency control, if so, then carry out step 4), if not, then return step 2);
4) when determining whether that the grid-connected point voltage of wind energy turbine set exceeds permission range of operation, if so, the also site reactive voltage emergency control of wind energy turbine set is then carried out, if not, then for the access point voltage of wind energy turbine set exceeds permission range of operation, carry out the access reactive voltage emergency control of wind energy turbine set;
5) by and the reactive voltage emergency control of site and access point make wind energy turbine set and site and access point voltage run in permission range of operation.
2. a kind of wind power plant reactive voltage emergency control method according to claim 1, is characterized in that, the permission range of operation of the grid-connected point voltage of described wind energy turbine set is 0.97U
n~ 1.07U
n, the permission range of operation of the access point voltage of described wind energy turbine set is 1.0U
n~ 1.067U
n.
3. a kind of wind power plant reactive voltage emergency control method according to claim 1, it is characterized in that, described step 3) in the condition meeting emergency control be wind energy turbine set and site and access point voltage exceed and allow range of operation to run certain hour, and all Reactive-power control equipment puts into operation.
4. a kind of wind power plant reactive voltage emergency control method according to claim 2, is characterized in that, described step 4) in wind energy turbine set and site reactive voltage emergency control specifically comprise the following steps:
41) when the grid-connected point voltage of wind energy turbine set is less than 0.97U
ntime, the secondary load of cut-out, and the Wind turbines on the feeder line that the idle characteristic of preferential excision is poor and electrical distance is far away;
42) when the grid-connected point voltage when wind energy turbine set is greater than 1.07U
ntime, by the concentrated access point of wind energy turbine set and electric brake off-the-line.
5. a kind of wind power plant reactive voltage emergency control method according to claim 2, is characterized in that, described step 4) in the access point reactive voltage emergency control of wind energy turbine set specifically comprise the following steps:
43) when wind energy turbine set access point voltage is less than 1.0U
ntime, the secondary load of cut-out, sends cutting machine signal by wind energy turbine set main website, excises the Wind turbines on idle characteristic difference and electrical distance feeder line far away;
44) when wind energy turbine set access point voltage is greater than 1.067U
ntime, access point excises a 220kV wind-powered electricity generation and sends circuit.
6. a kind of wind power plant reactive voltage emergency control method according to claim 3, is characterized in that, described Reactive-power control equipment comprises secondary capacitor, voltage reactor and SVG.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510114541.1A CN104701855A (en) | 2015-03-16 | 2015-03-16 | Emergency control method for reactive voltages of wind power plant |
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|---|---|---|---|
| CN201510114541.1A CN104701855A (en) | 2015-03-16 | 2015-03-16 | Emergency control method for reactive voltages of wind power plant |
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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 |
| CN102842920A (en) * | 2012-08-21 | 2012-12-26 | 中国电力科学研究院 | AC (alternating current) /DC (direct current) coordinating and control method for restraining large-scale wind turbine tripping |
| CN104362666A (en) * | 2014-10-09 | 2015-02-18 | 清华大学 | Low-voltage generator tripping emergency control method for wind power plant |
-
2015
- 2015-03-16 CN CN201510114541.1A patent/CN104701855A/en active Pending
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 |
| CN102842920A (en) * | 2012-08-21 | 2012-12-26 | 中国电力科学研究院 | AC (alternating current) /DC (direct current) coordinating and control method for restraining large-scale wind turbine tripping |
| CN104362666A (en) * | 2014-10-09 | 2015-02-18 | 清华大学 | Low-voltage generator tripping emergency control method for wind power plant |
Non-Patent Citations (1)
| Title |
|---|
| 梁纪峰: "基于大规模风电集中接入电网的无功电压特性及控制研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20150610 |