CN102508162A - Low-voltage ride through detection system and method of wind generating set - Google Patents
Low-voltage ride through detection system and method of wind generating set Download PDFInfo
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- CN102508162A CN102508162A CN2011103795153A CN201110379515A CN102508162A CN 102508162 A CN102508162 A CN 102508162A CN 2011103795153 A CN2011103795153 A CN 2011103795153A CN 201110379515 A CN201110379515 A CN 201110379515A CN 102508162 A CN102508162 A CN 102508162A
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Abstract
The invention provides a low-voltage ride through detection system of a wind generating set. The low-voltage ride through detection system comprises a power grid simulation device, a dummy load, a voltage sag control unit and a detection unit; the power grid simulation device is used for simulating voltage of a power grid; the dummy load is used for simulating a load of the power grid; the power grid simulation device and the tested wind generating set supply electricity to the dummy load together; the voltage sag control unit is connected between the power grid simulation device and the tested wind generating set for making the output voltage of the power grid simulation device undergo voltage sag; and the detection unit is respectively connected with the power grid simulation device and the tested wind generating set for detecting the low-voltage ride through performance of the tested wind generating set. The invention further provides a low-voltage ride through detection method of the wind generating set. According to the low-voltage ride through detection system of the wind generating set and the low-voltage ride through detection method of the wind generating set provided by the invention, the low-voltage ride through capability of a fan can be tested under the precondition that the power grid is not utilized.
Description
Technical field
The present invention relates to wind generating technology, relate in particular to the wind power generating set low-voltage and pass through detection system and method.
Background technology
Along with the continuous development of wind power technology, the blower fan installed capacity constantly increases, and progressively improve the status of wind-powered electricity generation in electric system.Meanwhile, various countries' grid company has all proposed stricter technical requirement to being incorporated into the power networks of wind-powered electricity generation unit in succession, this be because: when the wind-powered electricity generation installed capacity hour, the operation of wind energy turbine set can not consider the influence of stability of power system; But along with the wind-powered electricity generation installed capacity is increasing, wind-powered electricity generation is when proportion increases year by year in electric system, and the operation of wind energy turbine set becomes gradually to the influence of system stability and can not be ignored.Therefore, in order to keep the stable operation of electric system,, also require the wind-powered electricity generation unit to satisfy stricter interconnection technology requirement except that requiring to improve the technical merit of wind-powered electricity generation unit self.And interconnection technology requires wherein crucial one be low-voltage and pass through (low voltage ride-though, LVRT) ability.Low-voltage (LVRT) ability of passing through is meant that blower fan is incorporated into the power networks point voltage when falling, and blower fan can keep being incorporated into the power networks, even can the part reactive power be provided to electrical network, supports line voltage to recover, and is normal up to power system restoration, thus " passing through " this low-voltage time.
Satisfy the low voltage ride-through capability that is incorporated into the power networks and requires in order to ensure wind power generating set, before blower fan formally is incorporated into the power networks, all can the low voltage ride-through capability of blower fan be detected.At present common detection method is for passing through testing apparatus in the low-voltage of connect between electrical network and the blower fan, and making low-voltage through this equipment falls, thereby whether the detection aerogenerator possesses low voltage ride-through capability.Pass through test though this method can be carried out low-voltage, it must pass through checkout equipment with low-voltage and be connected between electrical network and the blower fan, thereby need obtain the permission of grid company.In addition, even obtain the grid company permission, because in practical application; The lifting of wind power generating set and power grid construction are also asynchronous; If power grid construction is slower, need wait until then whether power grid construction could carry out the low voltage ride-through capability experiment to wind power generating set after accomplishing, satisfy the low voltage ride-through capability that is incorporated into the power networks and requires to confirm wind power generating set; Thereby prolonged the time that the wind-powered electricity generation construction project is accomplished, reduced work efficiency.
Summary of the invention
The present invention is directed to the problems referred to above that exist in the prior art; Provide a kind of the wind power generating set low-voltage pass through detection system; It can carry out the test of blower fan low voltage ride-through capability under the prerequisite of not using electrical network; Thereby not only can pass through performance, also shorten the deadline of wind-powered electricity generation construction project in the low-voltage of the Pretesting blower fan that dispatches from the factory.
In addition; The present invention also provides a kind of wind power generating set low-voltage to pass through detection method; Adopt this method under the prerequisite of not using electrical network, to carry out the blower fan low-voltage and pass through test; Thereby not only can pass through performance, also shorten the deadline of wind-powered electricity generation construction project in the low-voltage of the Pretesting blower fan that dispatches from the factory.
For this reason; The invention provides a kind of wind power generating set low-voltage and pass through detection system; It comprises electrical network analogue means, fictitious load, electric voltage dropping control module and detecting unit; Said electrical network analogue means is used to simulate line voltage, and said fictitious load is used to simulate the electrical network load, and said electrical network analogue means and wind power generating set to be tested are supplied power to fictitious load jointly; Said electric voltage dropping control module is connected between electrical network analogue means and the wind power generating set to be tested; Be used to make electrical network analogue means output voltage to produce electric voltage dropping, said detecting unit is connected with wind power generating set to be tested with said electrical network analogue means respectively, and the low-voltage that is used to detect said wind power generating set to be tested is passed through performance.
Wherein, said electric voltage dropping control module comprises electric voltage dropping module and control module, and said control module is used to control the switch and the electric voltage dropping time of said electric voltage dropping module.
Wherein, the said electric voltage dropping module generation of said control module may command three-phase falls, two-phase is fallen falls with single-phase.
Wherein, Said electric voltage dropping module comprises current-limiting impedance device and short-circuit impedance device; Said current-limiting impedance device is connected between electrical network analogue means and the wind power generating set to be tested; Said short-circuit impedance device one end connection is between said current-limiting impedance device and the wind power generating set to be tested other end ground connection.
Wherein, said electrical network analogue means is a diesel generator set.
Wherein, said detecting unit also is used to detect the output power of said electrical network analogue means and wind power generating set.
In addition, the present invention also provides a kind of wind power generating set low-voltage to pass through detection method, and it comprises the steps: 1) simulate line voltage with the electrical network analogue means, and supply power to fictitious load; 2) wind power generating set and said electrical network analogue means are incorporated into the power networks, and supply power to fictitious load jointly with the electrical network analogue means; 3) control electric voltage dropping module produces electric voltage dropping, and whether the detection wind power generating set possesses low voltage ride-through capability.
Wherein, before said step 1), also comprise the steps: the bypass of said electric voltage dropping module.
Wherein, said electrical network analogue means is a diesel generator set.
The present invention has following beneficial effect:
Wind power generating set low-voltage provided by the invention is passed through detection system; Simulate true electrical network owing to use the electrical network analogue means; Therefore carrying out the blower fan low-voltage when passing through test; Needn't re-use the low-voltage that electrical network can detect blower fan and pass through performance, pass through test thereby before blower fan dispatches from the factory, can accomplish low-voltage.In addition, owing to before dispatching from the factory, accomplished dependence test, thereby, can no longer carry out dependence test at the wind-powered electricity generation construction project, shortened the deadline of wind-powered electricity generation construction project.
Wind power generating set low-voltage provided by the invention is passed through detection method; Simulate true electrical network owing to use the electrical network analogue means; Therefore, pass through when test carrying out the blower fan low-voltage, only need that low-voltage is passed through testing apparatus and be connected between electrical network analogue means and the blower fan and get final product; Thereby not only need not the grid company permission, and before blower fan dispatches from the factory, can accomplish low-voltage and pass through test.In addition, owing to before dispatching from the factory, accomplished dependence test, thereby in the wind-powered electricity generation project construction, can no longer carry out dependence test, shortened the deadline of wind-powered electricity generation construction project.
Description of drawings
Fig. 1 passes through the detection system structured flowchart for wind power generating set low-voltage provided by the invention;
Fig. 2 passes through detection system one concrete structure synoptic diagram for wind power generating set low-voltage provided by the invention;
Fig. 3 is a system shown in Figure 2 electric voltage dropping process synoptic diagram;
Fig. 4 passes through the detection method process flow diagram for low-voltage provided by the invention.
Embodiment
For making those skilled in the art person understand technical scheme of the present invention better, wind power generating set low-voltage provided by the invention is passed through detection system and method is elaborated below in conjunction with accompanying drawing.
See also Fig. 1, wind power generating set low-voltage provided by the invention is passed through detection system, comprises electrical network analogue means 1, fictitious load 2, electric voltage dropping control module 3 and detecting unit 4.Electrical network analogue means 1 is used to simulate line voltage; Fictitious load 2 is used to simulate the electrical network load; Electrical network analogue means 1 is supplied power to fictitious load 2 with wind power generating set to be tested jointly, and electric voltage dropping control module 3 is connected between electrical network analogue means 1 and the wind power generating set to be tested, more specifically; Be connected electrical network analogue means 1 and and site (stain among Fig. 1) between; Be used to make electrical network analogue means 1 output voltage to produce electric voltage dropping, detecting unit 4 is connected with wind power generating set to be tested with electrical network analogue means 1 respectively, is used to detect the blower fan low-voltage and passes through performance.
Wherein, electrical network analogue means 1 can be the power output device such as diesel generator set, gasoline engine generator group, device of solar generating or the two combination; Because the diesel generator set development is ripe, so in practical application, preferably adopt diesel generator set.Electric voltage dropping control module 3 comprises and falls module and control module, falls module and is used to produce electric voltage dropping, and control module is used to control switch and the electric voltage dropping time of falling module.Detecting unit 4 is used to detect the low-voltage of wind power generating set and passes through performance, specifically can detect: 1) whether wind power generating set has the ability that keeps off-grid not to move certain hour continuously when the point voltage that is incorporated into the power networks falls; 2) if the point voltage that is incorporated into the power networks can return to 90% of rated voltage falling in a period of time, whether not wind-powered electricity generation unit off-grid moves continuously.Certainly, also can according to actual needs or stipulate, detect other performances of wind power generating set, whether possess low voltage ride-through capability with the testing wind power generation unit.
In addition, owing to raising or the reduction along with wind speed, exerting oneself of wind power generating set also correspondingly increases or reduces, so the wind power generating set output power is a random variation; Can stablize output power to fictitious load 2, the also real-time output power P that detects wind power generating set of detecting unit 4 in order to guarantee electrical network analogue means 1 and wind power generating set to be tested
1And detected power signal sent to electrical network analogue means 1, electrical network analogue means 1 changes output power according to this power signal, keeps wind power generating set output power P
1With electrical network analogue means 1 output power P
2Sum and load consumption power P
3Balance.
Be that example explains that wind power generating set low-voltage of the present invention passes through detection system below with the diesel engine.
As shown in Figure 2, this system comprises diesel generator set 20, electric voltage dropping module 21 and fictitious load 25, and blower fan 24 to be tested is connected with this system with current transformer 23 through transformer 22.After K switch shown in Fig. 21, K2 and K3 and closure, diesel generator set 20 is supplied power to fictitious load 25 with wind power generating set 24 to be tested jointly.Current transformer 23 can be followed the tracks of the output voltage (stain position voltage among the figure) of surveying diesel generator set 20; And be benchmark with this voltage signal; Make the alternating current of wind power generating set 24 outputs meet the condition of being incorporated into the power networks; The alternating current that is wind power generating set 24 outputs is identical with the electric voltage frequency and the phase place of the alternating current of diesel generator set 20 outputs, thereby wind power generating set 24 and diesel generator set 20 can be incorporated into the power networks.
Wherein, Diesel generator set 20 through self excitation system and speed regulator control voltage and frequency to simulate line voltage; And regulate self power according to the output power of wind power generating set 24 to be tested, to keep wind power generating set output power and diesel generator set output power sum and balance of load.Transformer 22 is 400v/620v or 400v/690v transformer, that is, the transformer 22 side voltage that links to each other with diesel generator set 20 is 400v, and the side voltage that links to each other with wind power generating set 24 to be tested is 620v or 690v.
Please consult Fig. 2 once more, electric voltage dropping module 21 comprises current-limiting impedance device X1 and short-circuit reactance device X2 and isolating switch CB1 and CB2.Current-limiting impedance device X1 is connected between diesel generator set 20 and the wind power generating set 24 to be tested, and short-circuit impedance device X2 one end connects and is between current-limiting impedance device X1 and the wind power generating set 24 to be tested other end ground connection.Electric voltage dropping realizes that through disconnection and the closure of control isolating switch CB1 and CB2 concrete falling process is as shown in Figure 3.After isolating switch CB1 was opened, current-limiting impedance device X1 is place in circuit just, and close circuit breaker CB2 then because that the access of short-circuit reactance device X2 makes that current-limiting impedance device X1 goes up voltage drop is low, thereby makes and place, site voltage produces and falls.And site place voltage can drop on rated voltage each electric pressure to zero; Specifically change the impedance intrinsic standoff ratio through the resistance value of regulating current limiting reactor X1 and short-circuit reactance device X2; And then the electric voltage dropping degree of depth of change test point, only need realize that in the present embodiment 20%, 50% and 80% electric voltage dropping gets final product.
Need explain to such an extent that be, wind power generating set low voltage detection system shown in Figure 2 has detecting unit and control module equally.The low-voltage that detecting unit is used to detect wind power generating set is passed through the output power of performance and diesel generator set and wind power generating set; Control module is used to control switch and the electric voltage dropping time of falling module, promptly controls the trip time of CB1 and the closure time of CB2.In addition; Electric voltage dropping module 21 shown in Fig. 2 just is used to schematically show the principle that produces electric voltage dropping, and in practical situation, current-limiting impedance device X1 and short-circuit reactance device X2 and isolating switch CB1 and CB2 are three-phase impedor and switch among the figure; Promptly; Current-limiting impedance device X1 and short-circuit reactance device X2 include three resistance, and isolating switch CB1 and CB2 include three switches, are connected with three of electrical network analogue means 1 output voltage respectively.When three switches with CB1 all break off, three switches of CB2 are all closed, just can produce three symmetrical falling; When with wherein two switches disconnections of CB1, with these two corresponding switch closures of switch, just can produce two and fall mutually among the CB2; When one of them switch of CB1 is broken off, with the corresponding switch closure of this switch, just can produce single-phase falling among the CB2.
Also need to prove; The wind power generating set low-voltage that present embodiment provides is passed through detection system; The low-voltage that not only needn't use electrical network can detect blower fan is passed through performance; And owing to only test the performance of passing through of 20%, 50% and 80% electric voltage dropping, and the electric voltage dropping module is low-pressure side testing apparatus (transformer 22 both sides voltages is 400v and 690v, are equivalent to low-pressure side); The control system that makes control module in the present embodiment pass through in the testing apparatus than conventional low-voltage is simple in structure, and cost reduces.
In addition, the present invention also provides a kind of wind power generating set low-voltage to pass through detection method, sees also Fig. 4, and it passes through the detection method process flow diagram for wind power generating set low-voltage of the present invention.As shown in Figure 4, be among the S1 in step, start the electrical network analogue means; And be its prestowage, detailed process is following: start the electrical network analogue means, when treating that said electrical network analogue means reaches predetermined voltage and frequency; Said electrical network analogue means is connected with fictitious load, and manually is the prestowage of said electrical network analogue means, wherein; Said electrical network analogue means is used to simulate line voltage, and the frequency of its output voltage is identical with the frequency and the phase place of line voltage with phase place.
Then in step S2, make being incorporated into the power networks of blower fan genset, supply power to fictitious load jointly.Detailed process is following: the frequency and the phase place that save said wind power generating set output voltage according to said electrical network analogue means output voltage amplitude, frequency and phase place; So that the frequency of said wind power generating set and said power compensating device output voltage is consistent with phase place; The output voltage of treating said wind power generating set and said electrical network analogue means synchronously after; Make the access grid-connected point of said wind power generating set; To said fictitious load power supply, completion is incorporated into the power networks jointly for said wind power generating set and electrical network analogue means.
At last, treat electrical network analogue means and wind power generating set stable operation after, control electric voltage dropping module produces electric voltage dropping, and the low-voltage that detects wind power generating set is passed through performance.
Explain that below in conjunction with Fig. 2 the wind power generating set low-voltage passes through detection method, its detailed process is following:
1) makes K1, K2, K3 switch be in open position, confirm the correct and action message of all protective devices, setting value of test device therefor; And make isolating switch CB1 closed, isolating switch CB2 breaks off, so that the bypass of electric voltage dropping module;
2) close circuit breaker K1 and isolating switch K3 make electrical network analogue means 20 give fictitious load 25 power supplies separately;
3) treat electrical network analogue means 20 and fictitious load 25 stable operations after, detect the voltage magnitude and the frequency signal of transformer 22, if within normal range; Close circuit breaker K2 then; Blower fan net side converter 23 is followed the tracks of the voltage signal of electrical network analogue means output, synchronous fully back closed blower fan self isolating switch, and blower fan is accomplished and is incorporated into the power networks; This moment, the output power of blower fan approached zero, and is therefore also very little to the impact of electrical network analogue means; After the completion of being incorporated into the power networks, blower variable-pitch system control blade angle increases the wind energy of absorption gradually, and the output power of blower fan also will improve thereupon.Along with the raising or the reduction of wind speed, exerting oneself of aerogenerator also correspondingly increases or reduces.And when wind energy conversion system sent the active power variation, the electrical network analogue means changes to exert oneself kept the balance between both sums and the load all the time, realized the stable operation of this system.
4) treat the operation of system complete stability after, cut-off breaker CB1 inserts X1, X1 can set through control module turn-on time.Electric voltage dropping realizes through control isolating switch CB2 is closed, and place, site voltage can drop on rated voltage each electric pressure to zero.Behind the CB2 breaker closing, short-circuit reactance X2 is dropped into, and voltage begins to fall; After continuing a period of time behind the electric voltage dropping, promptly isolating switch CB2 begins recovery voltage after closed a period of time; Cut-off breaker CB2; Short-circuit reactance X2 is cut out, close circuit breaker CB1 after a period of time, and a low-voltage is passed through testing experiment and is finished.
5) in step 4) electric voltage dropping process; Detect the low-voltage of wind power generating set and pass through performance; Specifically can detect wind power generating set to be tested off-grid operation whether not in the electric voltage dropping process; That is, whether the output power of wind power generating set reduces to zero in the electric voltage dropping process, passes through requirement if low-voltage is not quite promptly satisfied in wind power generating set to be tested output power variation in the electric voltage dropping process.
It is understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For the one of ordinary skilled in the art, under the situation that does not break away from the present invention's spirit and essence, can make various modification and improvement, these modification also are regarded as protection scope of the present invention with improving.
Claims (9)
1. a wind power generating set low-voltage is passed through detection system; It is characterized in that; Comprise electrical network analogue means, fictitious load, electric voltage dropping control module and detecting unit; Said electrical network analogue means is used to simulate line voltage, and said fictitious load is used to simulate the electrical network load, and said electrical network analogue means and wind power generating set to be tested are supplied power to fictitious load jointly; Said electric voltage dropping control module is connected between electrical network analogue means and the wind power generating set to be tested; Be used to make electrical network analogue means output voltage to produce electric voltage dropping, said detecting unit is connected with wind power generating set to be tested with said electrical network analogue means respectively, and the low-voltage that is used to detect said wind power generating set to be tested is passed through performance.
2. wind power generating set low-voltage as claimed in claim 1 is passed through detection system; It is characterized in that; Said electric voltage dropping control module comprises electric voltage dropping module and control module, and said control module is used to control the switch and the electric voltage dropping time of said electric voltage dropping module.
3. wind power generating set low-voltage as claimed in claim 2 is passed through detection system, it is characterized in that, the said electric voltage dropping module generation of said control module may command three-phase falls, two-phase is fallen falls with single-phase.
4. pass through detection system like claim 2 or 3 described wind power generating set low-voltages; It is characterized in that; Said electric voltage dropping module comprises current-limiting impedance device and short-circuit impedance device; Said current-limiting impedance device is connected between electrical network analogue means and the wind power generating set to be tested, and said short-circuit impedance device one end is connected between said current-limiting impedance device and the wind power generating set to be tested, other end ground connection.
5. wind power generating set low-voltage as claimed in claim 1 is passed through detection system, it is characterized in that, said electrical network analogue means is a diesel generator set.
6. wind power generating set low-voltage as claimed in claim 1 is passed through detection system, it is characterized in that, said detecting unit also is used to detect the output power of said electrical network analogue means and wind power generating set.
7. a wind power generating set low-voltage is passed through detection method, it is characterized in that, comprises the steps:
1) supplies power with electrical network analogue means simulation line voltage, and to fictitious load;
2) wind power generating set and said electrical network analogue means are incorporated into the power networks, and supply power to fictitious load jointly with the electrical network analogue means;
3) control electric voltage dropping module produces electric voltage dropping, and whether the detection wind power generating set possesses low voltage ride-through capability.
8. wind power generating set low-voltage as claimed in claim 7 is passed through detection method, it is characterized in that, before said step 1), also comprises the steps: the bypass of said electric voltage dropping module.
9. pass through detection method like claim 7 or 8 described wind power generating set low-voltages, it is characterized in that said electrical network analogue means is a diesel generator set.
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| CN103576085A (en) * | 2012-08-07 | 2014-02-12 | 上海电气风能有限公司 | Simply-equipped trigger device for testing wind generating set low voltage ride through function |
| CN104124916A (en) * | 2014-06-30 | 2014-10-29 | 国网青海省电力公司电力科学研究院 | Power grid fault simulation test system movement detection device for high-altitude photovoltaic power station |
| CN104215904A (en) * | 2014-09-04 | 2014-12-17 | 同济大学 | System and method for low-voltage ride-through test of full-power converter wind generating set |
| CN104764965A (en) * | 2015-04-21 | 2015-07-08 | 安徽大学 | Voltage sag generating device based on magnetic controllable reactor (MCR) |
| CN105388378A (en) * | 2015-11-09 | 2016-03-09 | 哈尔滨工业大学 | Voltage support experiment testing platform and method with super-capacitor-based dynamic voltage restorer |
| CN105403776A (en) * | 2015-09-07 | 2016-03-16 | 国网安徽省电力公司电力科学研究院 | Test method of low voltage ride-through capability of frequency converter based on magnetic powder brake |
| EP3043063A1 (en) * | 2015-01-08 | 2016-07-13 | Siemens Aktiengesellschaft | Islanded testing of a wind turbine generators compliance with fault ride through requirements of a power grid |
| CN108152667A (en) * | 2017-11-29 | 2018-06-12 | 中国电力科学研究院有限公司 | A kind of virtual synchronous generator failure passes through detection device and method |
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| CN105388378A (en) * | 2015-11-09 | 2016-03-09 | 哈尔滨工业大学 | Voltage support experiment testing platform and method with super-capacitor-based dynamic voltage restorer |
| CN108152667A (en) * | 2017-11-29 | 2018-06-12 | 中国电力科学研究院有限公司 | A kind of virtual synchronous generator failure passes through detection device and method |
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Application publication date: 20120620 |