CN104793091A - Site test and evaluation method of doubly-fed converter - Google Patents
Site test and evaluation method of doubly-fed converter Download PDFInfo
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Abstract
The invention relates to a site test and evaluation method of a doubly-fed converter, and belongs to the technical field of test and evaluation of wind power converters. The site test and evaluation method comprises the following steps: using an existing test instrument to achieve the following test items by using a one-time sensor installation manner: grid control, load, temperature rise, efficiency, rated output power, total harmonic distortion, power factor, protection function and stable operation; evaluation: after obtaining the test results of the items, comprehensively evaluating the doubly-fed converter to determine whether the doubly-fed converter meets the site operation demand. Compared with the present condition that only laboratory test can be carried out on the doubly-fed converter, the method provided by the invention is used for achieving site test and fulfilling the target of enabling the user to master the operation state of the doubly-fed converter in an actual application environment, meanwhile, the test sensor is accessed in one time in the method provided by the invention and measures all parameters after being electrified, which not only guarantees the synchronous test of some data, but also reduces danger coefficients in the operation process and improves the test efficiency at the same time.
Description
Technical field
The present invention relates to a kind of on-the-spot test and appraisal procedure of double-feed current transformer, belong to the test and evaluation technical field of wind electric converter.
Background technology
Along with domestic wind generating technology fast development, installed capacity, quantity are risen fast, and wind-power electricity generation proportion in mains supply improves constantly.For double-fed wind energy converter, as the critical component of wind power generating set, need the control command of real-time reception master controller and the operational factor of self is stably fed back to unit master controller in time, finally completing the control to whole current transformer by master control.
The principle of work of Wind turbines is: wind energy drives blade to rotate, the kinetic energy of blade is converted into electric energy by double-fed generator, the electric energy conversion that double-fed generator exports by current transformer is and grid voltage amplitude, frequency, electric energy that phase place is consistent, and is stablely transported to electrical network, realizes grid-connected.
From principle of work, double-fed current transformer is the critical component of wind field electrical energy system, is the key that can unit generate electricity by way of merging two or more grid systems, and the performance index of current transformer directly affects the quality of power supply of electrical network, if some index does not reach requirement, will threaten power grid security.
How to obtain these indexs to evaluate the operating performance of current transformer, be a puzzlement tester's difficult problem always.In order to confirm the performance of current transformer, " GB/T 25388.2-2010 wind power generating set double-fed type current transformer part 2: test method " defines the method that current transformer simulation test is carried out in laboratory, adopting dragging motor simulation blower fan, being carried out the performance test of current transformer by overload experiment, the experiment of line voltage adaptive faculty, electromagnetic compatibility experiment, low-temperature working experiment, hot operation experiment, steady damp heat experiment etc.
The test condition of these test main analog wind fields, current transformer, after the test in laboratory, just enters wind field and carries out uniting and adjustment.
But in complete machine producer, the test in laboratory is the test of dispatching from the factory of current transformer producer, can not reflect the onsite application performance of current transformer strictly according to the facts, can not illustrate that current transformer can adapt to the applied environment of wind field, mainly because following several aspect:
(1) wind regime is complicated
When simulation test is carried out in laboratory, be adopt dragging motor simulation blower fan, the rotating speed of blower fan is by dragging Frequency Converter Control, and the wind speed and direction change of simulation can not represent complicated wind field wind regime, can not full test current transformer performance.Current transformer is when wind field runs, and the continuous frequent variations of wind speed and direction, adds current transformer and control difficulty, can truly reflect its test performance.
(2) grid condition is complicated
The grid-connected of laboratory is the electric energy produced by generator, and by the internal electric network receiving laboratory after current transformer rectification, filtering, this electrical network is civil power, very stable.The grid-connected circumstance complication of wind field current transformer many, because a wind field has multiple stage blower fan, there is simultaneously grid-connected possibility, and there is the situation of brownout, therefore, the grid-connected environment of wind field not only requires that the amplitude of current transformer regulator generator output voltage, frequency, phase place are consistent with electrical network, also to tackle the test of low-voltage crossing at any time, because grid condition is ever-changing, after grid-connected, may interference sources be there is, require that current transformer can be tackled.
(3) external environment condition is severe
The high/low temperature experiment in laboratory can judge that, under a certain low temperature or high temperature, current transformer can run well, but wind field but likely exists temperature decrease or rises sharply.
Therefore, for same evaluate parameter, test under different environmental baselines, result has relatively big difference.Under the condition of wind field complexity, online grid-connected after, the reflection of its performance index be the fiting effect of current transformer and whole unit.
On-the-spot test is the key foundation that current transformer is selected by complete machine producer.
Therefore, on-the-spot test is essential.
But on-the-spot test, due to harsh environmental conditions, operational hazards, is in space state always.
Consider how to carry out that on-the-spot test will consider to test from laboratory will be different, this invention mainly proposes following scheme:
(1) optimal inspection project
In wind field test link, have many places different from laboratory, such as, current transformer will go through temperature from being up to minimum test at the stage back warp of online rear operation, therefore need not carry out high/low temperature experiment and steady damp heat experiment specially.And for example, after current transformer is online, various undesired signal can be subject to, therefore, also need not carry out electromagnetic interference (EMI) experiment specially.
In the test event that laboratory is carried out, as output rating, carry out under ideal conditions (dragging motor travels at the uniform speed, electromagnetic interference (EMI) is little, temperature variation is little, without impacts such as wind vectors), for wind field generating, on-the-spot test is subject to the impacts such as wind speed change, wind vector, temperature variation, electromagnetic interference (EMI), therefore test result has more authenticity and confidence level, is convenient to the grid-connected performance of wind-powered electricity generation complete system plant overall understanding current transformer.
(2) optimal inspection scheme
Because space in wind field test box is narrow, the test temperature difference is large, and relate to forceful electric power, in order to support personnel's safety, can not hot line job, therefore, need in testing scheme to simplify every test, accomplish, by disposable for testing sensor access, to complete the measurement of whole parameter after powering on, both ensured the synchronism detection of some data as far as possible, the danger coefficient in operating process can be reduced again, improve testing efficiency simultaneously.
This patent of invention, changes the present situation that current transformer only carries out laboratory test, does not emphasize the test result under ideal conditions, but focuses on the real running status of wind field severe complex condition unit.
Summary of the invention
The object of patent of the present invention is: the on-the-spot test and the appraisal procedure that provide a kind of double-feed current transformer, reaches the object reflecting on-the-spot current transformer running status.
The object of the invention is to be achieved through the following technical solutions:
The on-the-spot test method of double-feed current transformer and an assessment, comprise following content:
Test: utilize existing testing tool, adopts the disposable mounting means of sensor to realize the test of following project: cutting-in control test, loading test, temperature rise test, efficiency test, output rating test, total harmonic distortion test, power factor test, defencive function test and stable operation are tested;
Assessment: after the test result obtaining above-mentioned each test event, requires to carry out comprehensive assessment to double-feed current transformer according to test index, determines whether it meets on-the-spot service requirement.
Described existing testing tool comprises temperature measurer, wave tracer, power analysis instrument.
Beneficial effect:
Contrast the existing present situation can only carrying out laboratory test to feedback current transformer, the inventive method achieves the on-the-spot test of double-feed current transformer, reach the object making user understand the running status of double-feed current transformer under practical service environment, fill up the blank of current double-feed current transformer on-the-spot test technology, simultaneously the present invention propose by testing sensor, disposable access, the measurement of whole parameter is completed after powering on, namely ensure some data synchronism detection, the danger coefficient in operating process can be reduced again, improve testing efficiency simultaneously.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention on-the-spot test network design schematic diagram.
Fig. 2 be the embodiment of the present invention in three-phase four-wire system, measure three-phase general power circuit connection diagram with genuine standard.
Fig. 3 be the embodiment of the present invention in three-phase three-line system, measure three-phase general power circuit connection diagram with two meter technique.
Embodiment
For making the object of invention, technical scheme, advantage more clear, below in conjunction with accompanying drawing, the present invention will be further described.The present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Below for existing testing tool: wave tracer DL850, power analysis instrument WT3000 and infrared thermometer, be described in further details the present invention.
Be illustrated in figure 1 the present embodiment on-the-spot test network design schematic diagram, after double-feed current transformer to be measured presses access network shown in figure, carry out test and evaluation according to following step:
(1) the disposable access of sensor:
Determine that test point is respectively test point 1---output transformer output terminal; Test point 2---current transformer output terminal; Test point 3---current transformer motor side; Test point 4---generator unit stator output terminal;
Suitable voltage clamp, current clamp is selected respectively according to the voltage of test point 1,2,3 and 4, current range, to often accessing current clamp, voltage clamp respectively mutually on the threephase cable of all test points, current clamp is installed according to the flow direction of electric current, voltage clamp by red cramp joint voltage detection end, black cramp joint Voltage Reference end.
Because infrared thermometer is non-contact temperature measuring, so can test at any time by hand-held infrared thermometer, be that direct infrared thermometer is tested after connecting above-mentioned current clamp, voltage clamp in the present embodiment.
(2) collection of sensor signal:
According to the test point 1,2,3 and 4 that test event is determined, the electrical signal of the voltage clamp that it connects, current clamp is linked into WT3000 or DL850.
(3) specifically test:
By testing tool with after network connects as shown in Figure 1, adopt following process implementation test event: cutting-in control test, load the test that test, temperature rise test, efficiency test, output power test, total harmonic distortion test, power factor test, defencive function test and stable operation tests:
1) cutting-in control test: by being arranged on the current clamp of test point 4 generator unit stator output terminal, being linked into the test lead of wave tracer DL850, reading grid-connected dash current from wave tracer DL850;
2) test is loaded: by being arranged on test point 1 output transformer output terminal, test point 2 current transformer output terminal, the voltage clamp of test point 4 generator unit stator output terminal, current clamp access power analytical instrument WT3000, carry out the synchronism detection of voltage, electric current, power.
3) temperature rise test: use contactless temperature measurer to carry out the temperature rise test of current transformer power component and reactor, as infrared thermometer.
4) efficiency test: when unit operation is in rated condition, by voltage clamp, the current clamp access power analytical instrument WT3000 of test point 2 current transformer output terminal and test point 3 current transformer motor side, carry out the synchronism detection of voltage, electric current, power, the power ratio calculating current transformer output terminal and current transformer motor side obtains conversion efficiency.
Genuine standard or two meter technique can be used to carry out according to field condition during measured power.
Be illustrated in figure 2 in three-phase four-wire system, measure three-phase general power circuit connection diagram with genuine standard, for being total to N connection shown in figure, its wiring feature is the voltage of each power is all with center line N for reference point, and each phase power is respectively p
aN, p
bN, p
cN.Three-phase general power is:
be respectively phase voltage u
aNwith phase current i
a, phase voltage u
bNwith phase current i
b, phase voltage u
cNwith phase current i
cphase differential.
Be illustrated in figure 3 in three-phase three-line system, measure three-phase general power circuit connection diagram with two meter technique, have three kinds of measuring methods: A wiring altogether, altogether B wiring and C wiring altogether.Illustrate for common C wiring in figure, one group of voltage cramp joint voltage u
aC, current sensor flows through current i
a, another group voltage cramp joint voltage u
bC, current sensor flows through current i
b.Three-phase general power is:
p＝u
ACi
A+u
BCi
B
5) output rating test: when unit operation is in rated condition, by the voltage of test point 1 output transformer output terminal, current clamp access power analytical instrument WT3000, obtain output rating.
6) total harmonic distortion test: when unit operation is in rated condition, by the voltage of test point 1 output transformer output terminal, current clamp access power analytical instrument WT3000, calculate total harmonic distortion factor.
7) power factor test: by the voltage of test point 1 output transformer output terminal, current clamp access power analytical instrument WT3000, calculate power factor value.
8) defencive function test: current transformer, as run into abnormal running condition, by automatic starting protection function, is shut down and reports fault.
9) stable operation test: whole unit is in continuous operating time during specified running status.
Can find out that method of testing of the present invention adopts the disposable installation of sensor from embodiment above, by wave tracer or power analysis instrument, carry out the test of projects.In test process, operating personnel do not contact the high voltage of current transformer, high current element, a touch-safe test lead.
Assessment:
After the test result obtaining above-mentioned each test event, can assess double-feed current transformer, determine whether it meets on-the-spot service requirement.
Assessment embodiment
Grid-connected dash current should be less than rated current;
When loading test, the power of test point 1 output transformer output terminal equals the power sum of test point 2 current transformer output terminal and test point 4 generator unit stator output terminal;
Temperature rise test result should meet the regulation of 6.4.6 in GB/T 3859.1-1993;
Efficiency test value should be greater than 96%;
Total harmonic distortion test value should meet the regulation of in GB/T 20320-2006 8.4;
Power factor should between capacitive and perception controllable adjustment, its value is larger, shows that active power accounts for general power ratio higher;
Defencive function is tested, and current transformer, as run into abnormal running condition, by automatic starting protection function, is shut down and reports fault;
Parallel-adder settle-out time should more than 72 hours.
If test result meets above-mentioned all conditions, can assert that described double-feed current transformer meets on-the-spot service requirement.
Above-described specific descriptions; the object of inventing, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the on-the-spot test of double-feed current transformer and an appraisal procedure, is characterized in that, comprise test and evaluation; Described test utilizes existing testing tool, adopts the disposable mounting means of sensor to realize the test of following project: cutting-in control test, loading test, temperature rise test, efficiency test, output rating test, total harmonic distortion test, power factor test, defencive function test and stable operation are tested; Described assessment is after the test result obtaining above-mentioned each test event, requires to carry out comprehensive assessment to double-feed current transformer, determine whether it meets on-the-spot service requirement according to test index.
2. the on-the-spot test of a kind of double-feed current transformer according to claim 1 and appraisal procedure, it is characterized in that, described existing testing tool comprises temperature measurer, wave tracer, power analysis instrument.
3. the on-the-spot test of a kind of double-feed current transformer according to claim 1 and appraisal procedure, it is characterized in that, described sensor is disposable is installed as voltage according to selected test point, current range selects suitable voltage clamp, current clamp respectively, to often accessing current clamp, voltage clamp respectively mutually on the threephase cable of all test points, current clamp is installed according to the flow direction of electric current, voltage clamp by red cramp joint voltage detection end, black cramp joint Voltage Reference end; Described selected test point is output transformer output terminal; Current transformer output terminal; Current transformer motor side; Generator unit stator output terminal.
4. the on-the-spot test of a kind of double-feed current transformer according to claim 3 and appraisal procedure, it is characterized in that, described cutting-in control test is the current clamp by being arranged on generator unit stator output terminal, is linked into the test lead of wave tracer, reads grid-connected dash current from wave tracer;
Described loading test, by the voltage clamp of output transformer output terminal, current transformer output terminal, generator unit stator output terminal, current clamp access power analytical instrument, carries out the synchronism detection of voltage, electric current, power;
Described temperature rise test uses contactless temperature measurer to carry out the temperature rise test of current transformer power component and reactor;
Described efficiency test is when unit operation is in rated condition, by voltage clamp, the current clamp access power analytical instrument of current transformer output terminal and current transformer motor side, carry out the synchronism detection of voltage, electric current, power, the power ratio calculating current transformer output terminal and current transformer motor side obtains conversion efficiency;
Described output rating test is when unit operation is in rated condition, and the voltage of output transformer output terminal, current clamp access power analytical instrument are obtained output rating;
Described total harmonic distortion test is when unit operation is in rated condition, by the voltage of output transformer output terminal, current clamp access power analytical instrument, according to IEC61400-21 standard, calculates total harmonic distortion factor;
Described power factor test is by the voltage of output transformer output terminal, current clamp access power analytical instrument, according to IEC61400-21 standard, calculates power factor value;
The test of described defencive function be described double-feed current transformer as run into abnormal running condition, by automatic starting protection function, shut down and report fault;
Described stable operation test is the continuous operating time of whole unit when being in specified running status.
5. the on-the-spot test of a kind of double-feed current transformer according to claim 4 and appraisal procedure, it is characterized in that, when described use power analysis instrument carries out efficiency test, genuine standard (see remarks 1) or two meter technique (see remarks 2) can be adopted.
6. according to on-the-spot test and the appraisal procedure of the arbitrary described a kind of double-feed current transformer of claim 1-5, it is characterized in that, described to require to carry out comprehensive assessment content to double-feed current transformer according to test index as follows:
Grid-connected dash current should be less than rated current;
When loading test, the power of output transformer output terminal should equal the power sum of current transformer output terminal and generator unit stator output terminal;
Temperature rise test result should meet the regulation of 6.4.6 in GB/T 3859.1-1993;
Efficiency test value should be greater than 96%;
Total harmonic distortion test value should meet the regulation of in GB/T 20320-2006 8.4;
Power factor should between capacitive and perception controllable adjustment, its value is larger, shows that active power accounts for general power ratio higher;
Defencive function is tested, and current transformer, as run into abnormal running condition, by automatic starting protection function, is shut down and reports fault;
Parallel-adder settle-out time should more than 72 hours;
If test result meets above-mentioned all conditions, can assert that described double-feed current transformer meets on-the-spot service requirement.
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Application publication date: 20150722 |