CN102508055B - Device and method for detecting wind power generation grid-connected system - Google Patents

Device and method for detecting wind power generation grid-connected system Download PDF

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CN102508055B
CN102508055B CN201110295112.0A CN201110295112A CN102508055B CN 102508055 B CN102508055 B CN 102508055B CN 201110295112 A CN201110295112 A CN 201110295112A CN 102508055 B CN102508055 B CN 102508055B
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voltage
inverter
blower fan
grid
output
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CN201110295112.0A
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CN102508055A (en
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孙秋野
张化光
滕菲
何志强
郭靖
刘振伟
马大中
杨珺
刘鑫蕊
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东北大学
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Abstract

The invention provides a device for detecting a wind power generation grid-connected system. The device comprises a power generation unit, a storage battery unit, an inversion unit, a load simulation and simulated power grid unit control unit, a control unit and a detection unit, wherein the power generation unit comprises a wind driven generator and a fan switching-in controller; the inversion unit comprises an inverter and an inverter switching-in controller; the load simulation and simulated power grid unit comprises a load selector, a simulated load, a grid-connected switching-in controller and a simulated power grid; the control unit comprises a DSP (Digital Signal Processor), storage equipment and a communication module; the detection unit comprises a fan state detection mechanism and an electric performance detection mechanism; and the storage battery unit comprises a storage battery, a storage battery controller and a Boost circuit. A method provided by the invention is used for respectively detecting the island operation of a fan to be detected, the grid-connected operation of the fan to be detected and the working state of the inverter to be detected when a standard fan is in a grid-connected state, thereby realizing the detection of the fan or the inverter under a plurality of loads, meeting the requirements of switching among multiple fans or the inverters, and improving the detection efficiency and accuracy.

Description

A kind of wind power generation grid-connected system pick-up unit and method

Technical field

The invention belongs to wind power generation and technical field of electricity, be specifically related to a kind of wind power generation grid-connected system pick-up unit and method.

Background technology

The blower detecting system existing is at present in the process of fan operation, realize collection, analysis, calculating fan performance parameter the rendering performance curve of performance basic parameter, and pass through the process of the variable frequency regulating speed control that gathers the transmission of pretreated signal to blower fan.Fan performance test is all most important for designing and developing of the check of finished product and new product, particularly for large-scale, and characteristic blower fan and single-piece, short run and stream condition have the situation of specific (special) requirements, and performance test is particularly important.At present, China fan performance detect greatly mainly with manual be main, exist research technique to fall behind, the shortcoming such as the large and experimental result of labor capacity is inaccurate.In addition the up-to-date scientific and technological wind-powered electricity generation of development generating testing agency can not select electricity generation system, can only in breaking down, carry out fault judgement to electricity generation system.Testing tool can only detect respectively aerogenerator and inverter under single loading condition simultaneously, has no idea to detect aerogenerator and the match condition of inverter under various loaded work piece condition.

Summary of the invention

For the deficiencies in the prior art, the invention provides a kind of wind power generation grid-connected system pick-up unit and method.

Wind power generation grid-connected system pick-up unit of the present invention, comprises generator unit, secondary battery unit, inversion unit, load simulation and simulating grid unit controls unit, control module and detecting unit;

Generator unit comprises aerogenerator and blower fan access controller;

Inversion unit comprises inverter and inverter access controller;

Load simulation and simulating grid unit comprise load selector and fictitious load, grid integration controller and simulating grid;

Control module comprises DSP, storage facilities and communication module;

Detecting unit comprises fan condition testing agency and electric property testing agency;

Secondary battery unit comprises accumulator, battery controller and Boost circuit;

The concrete connection of device is: aerogenerator is connected to the secondary battery unit with battery controller by aerogenerator access controller, aerogenerator connects the inverter with inverter access controller by aerogenerator access controller, the output of inversion unit is connected to fictitious load through load selector, simulate the load under different detecting patterns, aerogenerator is connected to fan condition testing agency, the output of fan condition testing agency is connected to electric property testing agency, electric property testing agency is connected with simulating grid, simulating grid is connected to the output terminal of inversion unit through grid integration controller, aerogenerator access controller, inverter access controller, load selector, electric property testing agency and grid integration controller are all connected to the IO port of DSP, communication module and memory device are external in DSP.

The blower fan access controller of described generator unit adopts multiple single-pole single-throw switch (SPST)s, each switch output terminal that wherein one end couples together as generator unit, and the other end connects respectively different aerogenerators.

The inverter access controller of described inversion unit adopts multiple single-pole single-throw switch (SPST)s, lay respectively at input end and the output terminal of inverter, the access of control inverter, the input end of inverter is connected with the output terminal of the output terminal of generator unit and secondary battery unit, and the output terminal of inverter access controller is connected with simulating grid unit with load simulation.

The load selector of described load simulation and simulating grid unit comprises single-pole single-throw switch (SPST) and control circuit, adopts multiple single-pole single-throw switch (SPST) parallel connections, and control circuit is connected to DSP output terminal, and control circuit output terminal is connected to single-pole single-throw switch (SPST);

Described fictitious load comprises three kinds of connected modes: the fictitious load that when islet operation, blower fan detects comprises the isolating switch of series connection and the electric capacity of fuse and three-phase Y-connection, inductance, Resistor Array Projector; The fictitious load that when grid-connected, blower fan detects comprises electric capacity, inductance and the Resistor Array Projector that the isolating switch of series connection is connected with fuse, three-phase hexagon; The fictitious load that when grid-connected, inverter detects comprises fuse, electric capacity, inductance and the resistance of isolating switch and three-phase Y-connection, corner connection parallel connection.

Described simulating grid comprises holding circuit; mu balanced circuit and tunable capacitor; adjustable resistance; controlled alternating-current voltage source; grid integration controller adopts multiple single-pole single-throw switch (SPST) parallel connections; the input end of grid integration controller is connected with the output of inverter access controller; grid integration controller output end connects holding circuit and mu balanced circuit successively; the three-phase output end of mu balanced circuit connects tunable capacitor and the adjustable resistance after parallel connection; controlled alternating-current voltage source is connected to tunable capacitor after parallel connection and the output terminal of adjustable resistance, forms Y-connection.

The fan condition testing agency of described detecting unit adopts anemoscope; Electric property testing agency comprises power quality analyzer and oscillograph.

The accumulator of described secondary battery unit adopts lead-acid accumulator, in parallel between each accumulator; Battery controller comprises voltage stabilizing chip, power supply control chip and output pressure regulation chip, accumulator connects voltage stabilizing chip input end, the output of voltage stabilizing chip connects the input of power supply control chip, and output pressure regulation chip input end is connected to the output of power supply control chip; The input of Boost circuit is as the input of secondary battery unit, and the output of Boost circuit is connected with the output of battery controller, as the output of secondary battery unit.

Detection method of the present invention comprises: when islet operation, the duty of aerogenerator to be measured detects, the duty of aerogenerator to be measured detects and the detection of inverter duty to be measured when grid-connected when grid-connected.

When aerogenerator islet operation to be measured, wind-power electricity generation machine testing carries out under standard inverter and stable simulation loading condition, the quality of the electric energy that main detection aerogenerator sends, judge in the duty of the pattern apparatus for lower wind generator of islet operation, select corresponding fictitious load by DSP control load selector switch.Now, electrical network does not affect electricity generation system.

When islet operation, aerogenerator duty detecting step to be measured is as follows:

Step 1: aerogenerator testing conditions determine: the secondary battery unit of aerogenerator detection system, inverter, transformer, the rated power of load selector and fictitious load is more than or equal to the applied power of aerogenerator;

Step 2: carry out aerogenerator and detect from net power-performance;

Step 2.1: regulate wind speed by DSP, and start aerogenerator, blower fan testing agency is by anemoscope, and power quality analyzer and oscillograph image data, comprising: line voltage, line current and wind speed, set sampling period and sample frequency.

Step 2.2: oscillograph is drawn blower voltage family curve according to the blower fan line voltage gathering, and similarity between calculating and plotting the blower voltage family curve and the blower voltage family curve of standard that go out.

S = ( Σ i = 1 n ( A i + B i ) Σ i = 1 n ( A i × B i ) U ‾ + Σ i = 1 n ln ( A i 2 + B i 2 ) P ‾ ) × Σ i = 1 n ( A i - B i ) - - - ( 1 )

Wherein,

S, blower voltage family curve similarity;

A i, be the magnitude of voltage on standard time point on the blower voltage family curve obtaining of sampling,

B i, be the magnitude of voltage on standard time point on the blower voltage family curve of standard,

for the mean value of voltage,

for the mean value of power,

N, sampled data number.

Step 2.2.1: the data stochastic sampling that oscillograph collection is come, the volt-ampere characteristic typical curve of the data and system storage of sampling is contrasted, calculated the similarity of two curves by formula (1).Wherein, system is to gathering 500 points in each clock period;

Step 2.2.2: the overall similarity S that calculates all sampling periods p, the similarity in each sampling period is averaged:

S p = 1 n Σ i = 1 n S i - - - ( 2 )

Step 2.2.3: the mean wind speed that calculates all sampling periods and average power

v ‾ = 1 n Σ i = 1 n v i P ‾ = 1 n Σ i = 1 n P i

Step 2.3:DSP regulates wind speed again, and repeating step 2.2 wherein, regulates wind speed than the wind speed that increased 1m/s last time at every turn, is limited to 12m/s on wind speed.

Step 3: under different wind friction velocities, detect blower fan duty.

Step 3.1: calculate the overall wind energy efficiency eta of blower fan con.

η con = 2 P n ρπ R 2 v n 3 - - - ( 3 )

Wherein:

P nfor the whole efficiency of blower fan output

ρ is atmospheric density now

R is flabellum radius

V nfor the wind speed under now measuring wind speed measurement

Step 3.2: the conversion efficiency of every bit in the calculating sampling cycle, draw overall dynamic translation efficiency curve.Conversion efficiency adopts following formula to calculate:

η n *=0.8η n+0.1η n-1+0.05η n-2+0.025×η n-3+0.00625×η n-4+0.00625×η n-5+0.00625×η n-6+0.00625×η n-7

Wherein η n *by memory stores, be to be calculated by the value of front 7 sampled points of this sampled point, be mainly the data of storage are carried out to buffer memory and filtering processing, make the powertrace that obtains more level and smooth, maximum reduce the unstable impact that experiment is processed of blower fan physical construction.

Step 3.3, calculates under isolated island condition the job evaluation index D of blower fan vi:

D vi = η vi × ρ v i 10 + 2 ln Σ i = 1 n Δ f i + ln Σ i = 1 n ( | P ni - P Bni ‾ ) | + S - - - ( 4 )

Wherein:

D vifor the evaluation index of wind speed blower fan in vi situation,

η vifor the conversion efficiency of wind speed blower fan in vi situation,

for within the sampling period, get frequency and the rated frequency of n point difference with,

for within the sampling period, get power and the rated frequency of n point difference with, wherein, P nirepresent the real power of i sampled point in n sampling period, P bnirepresent the calibration power of i sampled point in n sampling period.

Step 3.4, to the job evaluation index D of the blower fan under different vi vid averages.

D = D v 1 + D v 2 + D v 3 · · · D vn - 1 + D vn n - - - ( 5 )

Step 4, checks blower fan current detection environment;

Step 4.1, checks whether electricity generation system meets blower fan testing conditions, enters next step if met, if do not met, the data of gained is considered as to misdata.

Step 4.2, checks whether the curve of drawing out exists data catastrophe point, if existed, checks reason, the data of gained is kept in storer, in order to checking.

Step 5, if D > 1, if detected blower fan access electricity generation system is described, cannot normally work the in the situation that of islet operation; If D < 1, illustrates that this aerogenerator is applicable to access electricity generation system, can normally work the in the situation that of islet operation.

When aerogenerator to be measured is incorporated into the power networks, wind-power electricity generation machine testing carries out under standard inverter and stable simulation loading condition, aerogenerator is under being incorporated into the power networks, select corresponding fictitious load by DSP, carry out the duty of wind-driven generator simulation in the time being incorporated to simulating grid by building simulating grid and grid integration controller, analyze the impact of blower fan on electrical network under special circumstances, the main quality of power supply that detects aerogenerator output, judge the duty at the pattern apparatus for lower wind generator being incorporated into the power networks, now, electrical network exerts an influence to electricity generation system.

Before aerogenerator access simulating grid to be measured, need to determine testing conditions, specific as follows:

1. the Boost circuit that aerogenerator passes through, accumulator, inverter, transformer, grid integration controller, simulating grid, the rated power of load selector and fictitious load is more than or equal to the applied power of aerogenerator.

2. the short-circuit power of simulating grid is 50 times of aerogenerator short-circuit power; Voltage resultant distortion rate in 50 subharmonic must be lower than 5% of 10min mean value.

The measured value of simulating grid in any 0.2s specified definite value ± 1%, and guarantee that mains frequency can not change between detection period, if find that after detection finishes mains frequency does not meet the demands, the measured value between detection period and conclusion are all considered as to false data.

When grid-connected, the detecting step of aerogenerator duty to be measured is as follows:

Step 1: determine grid-connected testing conditions.

Step 2: gather wind power generation set grid-connection power-performance parameter, set sampling period and sample frequency.

By DSP, wind speed is adjusted to the wind rating of aerogenerator, blower fan testing agency is by anemoscope, and power quality analyzer and oscillograph acquisition parameter data, comprising: line voltage, line current and wind speed.

Step 3: calculate the data of each sampled point in each sampling period, comprise blower fan output voltage, inverter output voltage, blower fan output electric energy frequency, draw out respectively performance graph, be calculated as follows data:

Q n *=0.8Q n+0.1Q n-1+0.05Q n-2+0.025×Q n-3+0.00625×Q n-4+0.00625×Q n-5+0.00625×Q n-6+0.00625×Q n-7

Wherein Q n *by memory stores, be jointly to be calculated by the value in front 7 sampling periods in this moment, object is that the data of storage are carried out to buffer memory, filtering processing makes the powertrace that obtains more level and smooth, maximum has reduced the unstable impact that experiment is processed of blower fan physical construction.

Step 4: calculate blower fan output power and blower fan conversion efficiency according to the line current value of the blower fan output voltage calculating, inverter output voltage, blower fan output electric energy frequency and now blower fan output, and draw corresponding performance graph.

Step 5: blower fan output voltage curve, inverter output voltage curve, blower fan output electric energy frequency curve, blower fan output power curve and the blower fan conversion efficiency curve that calculating and plotting goes out and the similarity S of corresponding typical curve:

S = ( &Sigma; i = 1 n ( &alpha; i + &beta; i ) &times; &Sigma; i = 1 n ( &alpha; i &times; &beta; i ) + &Sigma; i = 1 n ln ( &alpha; i 2 + &beta; i 2 ) ) &times; &Sigma; i = 1 n ( &alpha; i - &beta; i ) - - - ( 6 )

Wherein,

α i, represent that measured actual curve is to the distance between initial point;

β i, represent that typical curve is to corresponding point to the distance between initial point.

Step 5.1: the data stochastic sampling that oscillograph is gathered, the typical curve of the data and system storage of sampling is contrasted, use above-mentioned formula to calculate the similarity of two curves.Wherein, system, to gathering 500 points in each clock period, is calculated the overall similarity S in all sampling periods p, the similarity in each sampling period is averaged:

The similarity in each cycle is made even and is overall similarity S:

S = &Sigma; i n ( S p ) n - - - ( 7 )

Step 5.2: blower fan output voltage curve similarity substitution above formula is obtained to overall blower fan output voltage similarity S uO; Inverter output voltage curve similarity substitution above formula is obtained to overall inverter output voltage similarity S uO'; Blower fan is exported to electric energy frequency curve similarity substitution above formula and obtain overall blower fan output electric energy frequency similarity S f; Powertrace similarity substitution above formula is obtained to overall blower fan output power similarity S p, conversion efficiency curve similarity substitution above formula is obtained to overall blower fan conversion efficiency similarity S η.

Step 6: calculate under grid-connected condition the job evaluation index D of blower fan g:

D G = S UO + S UO &prime; 2 + S F + S &eta; 3 - - - ( 8 )

Wherein:

D gfor the grid-connected job evaluation index of blower fan;

S uOfor blower fan output voltage similarity;

S uO' be inverter output voltage similarity;

S ffor blower fan output electric energy frequency similarity;

S ηfor conversion efficiency similarity.

Step 7: evaluation index judgement, if D g> 1, illustrates that this blower fan, cannot normally work when electricity generation system in access grid-connected in the situation that; If D g< 1 this aerogenerator of explanation is applicable to access electricity generation system, under grid-connected condition, can normally work.

While detecting inverter, access inverter to be measured and standard aerogenerator, and by grid integration controller access simulating grid, now select corresponding fictitious load by DSP control load selector switch.

When grid-connected, the detecting step of inverter duty to be measured is as follows:

The 1st step: the ratings that wind-power generation unit output voltage is adjusted to inverter input voltage; It is rated power that fine setting load makes the output power of inverter, slowly adjusts the output voltage of aerogenerator, inverter output voltage when making it in 80%~120% interior variation of ratings and measuring output voltage difference.

The 2nd step: aerogenerator output voltage is adjusted to inverter input voltage load voltage value 80%; Oscillograph is connected to inverter output end to be tested; Draw inverter output voltage and the curve of time, calculate voltage under standard 80% rated voltage in itself and storer and the similarity of time curve:

S ( U ) 80 % = &Sigma; i = 1 N ( &alpha; i 80 % + &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % &times; &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % - &beta; i 80 % ) - - - ( 9 )

Wherein,

α i, represent that measured actual curve is to the distance between initial point;

β i, represent that typical curve is to corresponding point to the distance between initial point.

The 3rd step: the output voltage of aerogenerator is changed to 90% rated voltage, calculates 90% rated voltage similarity S (U) 90%; The output voltage of aerogenerator is changed to 100% rated voltage, calculates 100% rated voltage voltage similarity S (U) 100%; The output voltage of aerogenerator is changed to 110% rated voltage, calculates 110% rated voltage voltage similarity S (U) 110%; The output voltage of aerogenerator is changed to 120% rated voltage, calculates 120% rated voltage voltage similarity S (U) 120%.

The 4th step: draw 80%~120% time in rated voltage of blower fan generating, the curve of line current and time, adopts the same operation in step 2~3 to obtain 80% rated voltage electric current similarity S (I) 80%, 90% rated voltage electric current similarity S (I) 90%; 100% rated voltage electric current similarity S (I) 100%; 110% rated voltage electric current similarity S (I) 110%; 120% rated voltage electric current similarity S (I) 120%.

S ( I ) 80 % = &Sigma; i = 1 n ( &epsiv; i 80 % + &mu; i 80 % ) &times; &Sigma; i = 1 n ( &epsiv; i 80 % &times; &mu; i 80 % ) &times; &Sigma; i = 1 n ( &epsiv; i 80 % - &mu; i 80 % ) - - - ( 10 )

The 5th step: by oscilloscope measurement inverter input line electric current I dC, line voltage U dCline current I with output aC, line voltage U aC, and calculate inverter efficiency eta:

&eta; = U AC &times; I AC U DC &times; I DC - - - ( 11 )

The 6th step: inverter input voltage is transferred to load voltage value, and regulation output electric current is ratings, reliably working is no less than 8h continuously; Regulation output electric current is 125% ratings, and reliably working is no less than 1min continuously; Input voltage is transferred to 125% ratings, and regulation output electric current is ratings, and reliably working is no less than continuous reliably working and is no less than 10s continuously.Judge in three kinds of situations, whether inverter work normally works.If all can normally work in three kinds of situations, to carry index be D to inverter band p=3; In two kinds of situations, can normally work, band carries index D p=1.5; If all cisco unity malfunction band carries index D in three kinds of situations p=0.

The 7th step: calculate inverter evaluation index:

Inverter overall similarity evaluation index D s:

D S = S ( I ) 80 % + S ( U ) 80 % 2 + S ( I ) 90 % + S ( U ) 90 % 2 + S ( I ) 100 % + S ( U ) 100 % 2 + S ( I ) 110 % + S ( U ) 110 % 2 + S ( I ) 120 % + S ( U ) 120 % 2 5

Inverter conversion efficiency evaluation index D η:

D &eta; = &eta; - &eta; B &eta; B - - - ( 12 )

Continuous duty Performance Evaluating Indexes D pthe 6th step draws as shown.

The 8th step: calculate inverter overall assessment index:

D N=D η+D S+LnD P

The 9th step: if D n≤ 1, illustrate that inverter is adapted at generating electricity by way of merging two or more grid systems in accessed electricity generation system.Otherwise inverter is not suitable for accessing this electricity generation system, can not be directly connected in inversion unit and generates electricity by way of merging two or more grid systems.

Beneficial effect:

(1) the present invention adopts the mode of separate detection, first by aerogenerator place in circuit, aerogenerator to be measured is accessed to electricity generation system, and by standard inverter access electricity generation system, judge the ruuning situation of aerogenerator to be measured by inverter place in circuit by the data that gather; Then, by inverter place in circuit, inverter to be measured is accessed to electricity generation system, aerogenerator place in circuit, by standard aerogenerator access electricity generation system, judges the ruuning situation of inverter to be measured by the data that gather, by judging respectively the concrete reason of the fault that can draw electricity generation system;

(2) realize the detection of aerogenerator under various loaded work piece condition, and detect time can meet the switching between multiple aerogenerators to be measured, realize comparison and the detection of multiple wind turbine power generation states; Efficiency and the accuracy of wind-power electricity generation machine testing are improved greatly;

(3) realize the detection of inverter under various loaded work piece condition, when detection, can meet the switching between multiple inverters to be measured, realize comparison and the detection of multiple inverter inversion duties, improved greatly efficiency and accuracy that inverter detects.

Accompanying drawing explanation

Fig. 1 embodiment of the present invention pick-up unit general structure block diagram;

Fig. 2 embodiment of the present invention blower fan islet operation detects schematic diagram;

Fig. 3 embodiment of the present invention fan performance testing agency schematic diagram;

Load schematic diagram when Fig. 4 embodiment of the present invention islet operation;

Fig. 5 embodiment of the present invention blower fan detects schematic diagram when grid-connected;

Fig. 6 embodiment of the present invention simulating grid structure principle chart;

Load schematic diagram under Fig. 7 embodiment of the present invention blower fan net state;

The catenation principle figure of Fig. 8 embodiment of the present invention accumulator;

Fig. 9 embodiment of the present invention inverter detects the catenation principle figure of load;

Figure 10 embodiment of the present invention load selector control circuit schematic diagram;

Figure 11 embodiment of the present invention aerogenerator access controller catenation principle figure;

Figure 12 embodiment of the present invention battery controller circuit theory diagrams wherein, are (a) that power supply control chip schematic diagram (b) is that voltage stabilizing chip schematic diagram (c) is output pressure regulation chip schematic diagram;

Figure 13 embodiment of the present invention communication module circuit catenation principle figure.

Embodiment

Below in conjunction with drawings and Examples, wind power generation grid-connected system pick-up unit of the present invention is described further.

Detection system of the present invention comprises generator unit, secondary battery unit, and inversion unit, load simulation and simulating grid unit controls unit, control module and detecting unit, as shown in Figure 1;

Generator unit comprises aerogenerator and blower fan access controller, and the initial loading machine model of standard aerogenerator is SKYWING 1000W, and the initial loading machine model of aerogenerator to be measured is FD2.8-1.0KW76.

Inversion unit comprises inverter to be measured and inverter access controller, and the initial loading machine model of standard inverter is KorkieK-1000W; The initial loading machine model of inverter to be measured is FD3.0-1000.The inverter access controller that this inverter is made up of KCD7-11 single-pole single-throw (SPST) rocker type switch and DKB0 protection switch is connected into inversion unit.

Control module comprises DSP, memory device and communication module, and DSP adopts TMS320F2407A, and communication module model MAX232 is connected with computing machine.Communication module circuit catenation principle figure as shown in figure 13.Memory device is made up of the SPI Flash of the SRAM of 12 IS61LV256-15J in parallel and the 8Mbit of 12 SST25VF080B-50-4C-QAF in parallel.Function is the intermediate quantity of storage standard information and storage detection system.

Detecting unit comprises fan condition testing agency and electric property testing agency, fan performance testing agency schematic diagram as shown in Figure 3, fan condition testing agency comprises anemoscope, mainly carries out wind-power electricity generation machine testing, the air velocity transducer of select+E of anemoscope EE65-VB5; Electric property testing agency is by three A, B, the oscillograph composition of the power quality analyzer that C is alternate and the output of three single channel input single channel.The signal of power quality analyzer output passes to the power quality analysis unit in DSP, mainly judges the stable case of three-phase electric energy.The signal of oscillograph output compares with the standard signal of storing in FLASH, analyzes by the waveform comparing unit in DSP, judges the current intelligence of three-phase electric energy, specifically builds as shown in Figure 3.

Described accumulator and battery controller, accumulator adopts lead-acid accumulator, and accumulator adopts 6-GFM-200Ah, in parallel between each accumulator.Accumulator is mainly that the unnecessary electric energy that solar electrical energy generation unit is sent stores, and serves as supplementary power supply, the difference power of balance inverter and genset when electric energy is in short supply.Battery controller is that battery condition is controlled.Wherein TPS787D318 is power supply control chip, and LM7812CT is voltage stabilizing chip, and IMB17 is output pressure regulation chip, and as shown in Figure 8, battery controller circuit theory diagrams as shown in figure 12 for the catenation principle figure of accumulator.

Access controller during wind-power electricity generation machine testing and inverter detect is made up of 4 die mould DNLAS4501DFT2G general purpose single monopole single throw switch.Blower fan access controller couples together one end using each piece to be wherein connected on accumulator as output, the end interface of every is connected respectively on 4 different aerogenerators in addition, wherein 1,2,3,4 respectively with DSP in ADCIN10, ADCIN11, ADCIN12, ADCIN13 is connected, connect as shown in figure 11, inverter access controller in like manner.

Load simulation and simulating grid unit comprise load selector and fictitious load, grid integration controller and simulating grid, load selector comprises single-pole single-throw switch (SPST) and control circuit, adopt ADG1334+12V four-way single-pole single-throw switch (SPST) array, control circuit is connected to DSP output terminal, control circuit output terminal is connected to single-pole single-throw switch (SPST), and fictitious load comprises three-phase breaker, three-phase fuse and three-phase simulation load; Simulating grid structure principle chart as shown in Figure 6; comprise holding circuit; mu balanced circuit and tunable capacitor; adjustable resistance; controlled alternating-current voltage source; grid integration controller adopts multiple single-pole single-throw switch (SPST) parallel connections; the input end of grid integration controller is connected with the output of inverter access controller; grid integration controller output end connects holding circuit and mu balanced circuit successively; the three-phase output end of mu balanced circuit connects tunable capacitor and the adjustable resistance after parallel connection; controlled alternating-current voltage source is connected to tunable capacitor after parallel connection and the output terminal of adjustable resistance, forms Y-connection.Wherein adjustable alternating-current voltage source, adjustable resistance, electric capacity has effectively been simulated the multiple situation of electrical network under different power factors, has increased the accuracy of simulating grid.Fictitious load comprises three-phase breaker, three-phase fuse and three-phase simulation load.

For optimizational function, to the load selector control circuit that outward in addition TI/SN74HCT574N is control chip, its hardware connects as shown in figure 10.K mbe within 1 o'clock, to be aerogenerator detecting pattern, now, K mbe within 0 o'clock, to be isolated island detecting pattern, K mbe within 1 o'clock, to be the grid-connected detecting pattern of aerogenerator; K mbe within 0 o'clock, to be inverter detecting pattern.A0, A1, B0, B1 accesses respectively the ADCIN06 in DSP, ADCIN07, ADCIN08, ADCIN09 pin is controlled access module.

The concrete connection of apparatus of the present invention is: aerogenerator is connected to the secondary battery unit with battery controller by aerogenerator access controller, aerogenerator connects the inverter with inverter access controller by aerogenerator access controller, the output of inversion unit is connected to fictitious load through load selector, simulate the load under different detecting patterns, aerogenerator is connected to fan condition testing agency, the output of fan condition testing agency is connected to electric property testing agency, electric property testing agency is connected with simulating grid, simulating grid is connected to the output terminal of inversion unit through grid integration controller, aerogenerator access controller, inverter access controller, load selector, electric property testing agency and grid integration controller are all connected to the IO port of DSP, communication module and memory device are external in DSP.

Three kinds of load connected modes are adjusted by load selector in load simulation and simulating grid unit controls unit: the load that when islet operation, blower fan detects is built, and the load that while being incorporated into the power networks, blower fan detects is built the load that inverter detects when grid-connected and built situation.

(1) fictitious load that blower fan detects when islet operation comprises the electric capacity that the isolating switch of series connection and fuse and three-phase star connect, inductance, and Resistor Array Projector, is specially by variable resistor R 1~R 2, constant resistance R 3~R 6; Variable capacitance C 1~C 3constant capacitance C 4~C 6; Variable inductance X 1~X 3constant inductance X 4~X 6common composition, connected mode as shown in Figure 4.

(2) fictitious load that while being incorporated into the power networks, blower fan detects comprises the isolating switch and electric capacity, inductance and Resistor Array Projector that fuse, three-phase hexagon are connected of series connection, is specially by variable resistor R 1, constant resistance R 2~R 6; Variable capacitance C 1~C 3constant capacitance C 4~C 6; Variable inductance X 1~X 2constant inductance X 3~X 6common composition, connected mode as shown in Figure 7.

(3) fictitious load that when grid-connected, inverter detects comprises fuse, and isolating switch composition and three-phase star connect, the electric capacity of corner connection parallel connection, inductance and resistance, R 1, X 1, C 1corner connection, R 2, X 2, C 2star connects, and specifically connects as Fig. 9.

Detection method of the present invention comprises: when islet operation, the duty of aerogenerator to be measured detects, the duty of aerogenerator to be measured detects and the detection of inverter duty to be measured when grid-connected when grid-connected.

In the present embodiment, blower fan islet operation detects schematic diagram as shown in Figure 2, and described aerogenerator islanded system detection method, comprises the following steps:

Step 1: determine aerogenerator testing conditions, by blower fan to be measured and standard inverter access electricity generation system.

Step 2: aerogenerator detects from net power-performance;

Step 2.1: regulate wind speed to 5m/s by DSP, and start aerogenerator, blower fan testing agency is by anemoscope, power quality analyzer and oscillograph image data.

Step 2.2: oscillograph is drawn blower voltage family curve according to the blower fan line voltage gathering, and similarity between calculating and plotting the blower voltage family curve and the blower voltage family curve of standard that go out.

S = ( &Sigma; i = 1 n ( A i + B i ) &Sigma; i = 1 n ( A i &times; B i ) U &OverBar; + &Sigma; i = 1 n ln ( A i 2 + B i 2 ) P &OverBar; ) &times; &Sigma; i = 1 n ( A i - B i ) &ap; 0.2715 - - - ( 1 )

Wherein,

S, blower voltage family curve similarity;

A i, be the magnitude of voltage on standard time point on the blower voltage family curve obtaining of sampling,

B i, be the magnitude of voltage on standard time point on the blower voltage family curve of standard,

for the mean value of voltage,

for the mean value of power,

N, sampled data number.

Step 2.2.1: the data stochastic sampling that oscillograph collection is come, the volt-ampere characteristic typical curve of the data and system storage of sampling is contrasted, calculated the similarity of two curves by formula (1).Wherein, system is to gathering 500 points in each clock period;

Step 2.2.2: the overall similarity S that calculates all sampling periods p, the similarity in each sampling period is averaged:

S p = 1 n &Sigma; i = 1 n S i &ap; 0.2634 - - - ( 2 )

Step 2.2.3: the mean wind speed that calculates all sampling periods and average power

v &OverBar; = 1 n &Sigma; i = 1 n v i &ap; 5.013 m / s P &OverBar; = 1 n &Sigma; i = 1 n P i &ap; 1031.54 W

Step 2.3:DSP regulates wind speed again, and repeating step 2.2 wherein, regulates wind speed than the wind speed that increased 1m/s last time at every turn, is limited to 12m/s on wind speed.

Step 3: under 5m/s wind friction velocity, detect blower fan duty.

Step 3.1: calculate the overall wind energy efficiency eta of blower fan con.

&eta; con = 2 P n &rho;&pi; R 2 v n 3 &ap; 82.65 % - - - ( 3 )

Wherein:

P nfor the whole efficiency of blower fan output

ρ is atmospheric density now

R is flabellum radius

V nfor the wind speed under now measuring wind speed measurement, i.e. 5m/s

Step 3.2: the conversion efficiency of every bit in the calculating sampling cycle, draw overall dynamic translation efficiency curve.Conversion efficiency adopts following formula to calculate:

η n *=0.8η n+0.1η n-1+0.05η n-2+0.025×η n-3+0.00625×η n-4+0.00625×η n-5+0.00625×η n-6+0.00625×η n-7≈83.24%

Wherein η n *by memory stores, be to be calculated by the value of front 7 sampled points of this sampled point, be mainly the data of storage are carried out to buffer memory and filtering processing, make the powertrace that obtains more level and smooth, maximum reduce the unstable impact that experiment is processed of blower fan physical construction.

Step 3.3, calculates under isolated island condition the job evaluation index D of blower fan vi:

D vi = &eta; vi &times; &rho; v i 10 + 2 ln &Sigma; i = 1 n &Delta; f i + ln &Sigma; i = 1 n ( | P ni - P Bni &OverBar; ) | + S &ap; 0.8527 - - - ( 4 )

Wherein:

D vifor the evaluation index of wind speed blower fan in vi situation,

η vifor the conversion efficiency of wind speed blower fan in vi situation,

for within the sampling period, get frequency and the rated frequency of n point difference with,

for within the sampling period, get power and the rated frequency of n point difference with, wherein, P nirepresent the real power of i sampled point in n sampling period, P bnirepresent the calibration power of i sampled point in n sampling period.

Step 3.4, to the job evaluation index D of the blower fan under different vi vid averages.

D = D v 1 + D v 2 + D v 3 &CenterDot; &CenterDot; &CenterDot; D vn - 1 + D vn n &ap; 0.8324 - - - ( 5 )

Step 4, checks blower fan current detection environment, whether meets the requirement that enters next step.

Step 5, D < 1, illustrates that this aerogenerator is applicable to access electricity generation system, can normally work the in the situation that of islet operation.

When blower fan is grid-connected, detect schematic diagram as shown in Figure 5, and under net state, the detection of the grid-connected duty of aerogenerator to be measured is carried out as follows:

Step 1: determine grid-connected testing conditions, by blower fan to be measured and standard inverter access electricity generation system.

Step 2: gather wind power generation set grid-connection power-performance parameter, setting the sampling period is 1 μ s and sample frequency 500HZ.

By DSP, wind speed is adjusted to the wind rating of aerogenerator, blower fan testing agency is by anemoscope, power quality analyzer and oscillograph acquisition parameter data.

Step 3: calculate the data of each sampled point in each sampling period, comprise blower fan output voltage, inverter output voltage, blower fan output electric energy frequency, draw out respectively performance graph, be calculated as follows data: Q n *=0.8Q n+ 0.1Q n-1+ 0.05Q n-2+ 0.025 × Q n-3+ 0.00625 × Q n-4+ 0.00625 × Q n-5+ 0.00625 × Q n-6+ 0.00625 × Q n-7wherein Q n *by memory stores, be jointly to be calculated by the value in front 7 sampling periods in this moment, object is that the data of storage are carried out to buffer memory, filtering processing makes the powertrace that obtains more level and smooth, maximum has reduced the unstable impact that experiment is processed of blower fan physical construction.

Step 4: calculate blower fan output power and blower fan conversion efficiency according to the line current value of the blower fan output voltage calculating, inverter output voltage, blower fan output electric energy frequency and now blower fan output, and draw corresponding performance graph.

Step 5: blower fan output voltage curve, inverter output voltage curve, blower fan output electric energy frequency curve, blower fan output power curve and the blower fan conversion efficiency curve that calculating and plotting goes out and the similarity S of corresponding typical curve:

S = ( &Sigma; i = 1 n ( &alpha; i + &beta; i ) &times; &Sigma; i = 1 n ( &alpha; i &times; &beta; i ) + &Sigma; i = 1 n ln ( &alpha; i 2 + &beta; i 2 ) ) &times; &Sigma; i = 1 n ( &alpha; i - &beta; i ) - - - ( 6 )

Wherein,

α i, represent that measured actual curve is to the distance between initial point;

β i, represent that typical curve is to corresponding point to the distance between initial point.

Step 5.1: the data stochastic sampling that oscillograph is gathered, the typical curve of the data and system storage of sampling is contrasted, use above-mentioned formula to calculate the similarity of two curves.Wherein, system, to gathering 500 points in each clock period, is calculated the overall similarity S in all sampling periods p, the similarity in each sampling period is averaged:

The similarity in each cycle is made even and is overall similarity S:

S = &Sigma; i n ( S p ) n - - - ( 7 )

Step 5.2: blower fan output voltage curve similarity substitution above formula is obtained to overall blower fan output voltage similarity S uO≈ 0.8725; Inverter output voltage curve similarity substitution above formula is obtained to overall inverter output voltage similarity S uO' ≈ 0.8636; Blower fan is exported to electric energy frequency curve similarity substitution above formula and obtain overall blower fan output electric energy frequency similarity S f≈ 0.6714; Powertrace similarity substitution above formula is obtained to overall blower fan output power similarity S p≈ 1.0371, obtains overall blower fan conversion efficiency similarity S by conversion efficiency curve similarity substitution above formula η≈ 0.5638.

Step 6: calculate under grid-connected condition the job evaluation index D of blower fan g:

D G = S UO + S UO &prime; 2 + S F + S &eta; 3 &ap; 0.8017 - - - ( 8 )

Wherein:

D gfor the grid-connected job evaluation index of blower fan;

S uOfor blower fan output voltage similarity;

S uO' be inverter output voltage similarity;

S ffor blower fan output electric energy frequency similarity;

S ηfor conversion efficiency similarity.

Step 7:D g< 1 this aerogenerator of explanation is applicable to access electricity generation system, under grid-connected condition, can normally work.

While detecting inverter, access inverter to be measured and standard aerogenerator, and by grid integration controller access simulating grid, now select corresponding fictitious load by DSP control load selector switch.

When grid-connected, the detecting step of inverter duty to be measured is as follows:

The 1st step: the about 12V of ratings that wind-power generation unit output voltage is adjusted to inverter input voltage; It is the about 1000W of rated power that fine setting load makes the output power of inverter, slowly adjusts the about 380V of output voltage of aerogenerator, inverter output voltage when making it in 80%~120% interior variation of ratings and measuring output voltage difference.

The 2nd step: aerogenerator output voltage is adjusted to inverter input voltage load voltage value 80%; Oscillograph is connected to inverter output end to be tested; Draw inverter output voltage and the curve of time, calculate voltage under standard 80% rated voltage in itself and storer and the similarity of time curve:

S ( U ) 80 % = &Sigma; i = 1 N ( &alpha; i 80 % + &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % &times; &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % - &beta; i 80 % ) &ap; 0.8359 - - - ( 9 )

Wherein,

α i, represent that measured actual curve is to the distance between initial point;

β i, represent that typical curve is to corresponding point to the distance between initial point.

The 3rd step: the output voltage of aerogenerator is changed to 90% rated voltage, calculates 90% rated voltage similarity S (U) 90%≈ 0.8721; The output voltage of aerogenerator is changed to 100% rated voltage, calculates 100% rated voltage voltage similarity S (U) 100%≈ 0.7935; The output voltage of aerogenerator is changed to 110% rated voltage, calculates 110% rated voltage voltage similarity S (U) 110%≈ 0.8036; The output voltage of aerogenerator is changed to 120% rated voltage, calculates 120% rated voltage voltage similarity S (U) 120%≈ 0.8148.

The 4th step: draw 80%~120% time in rated voltage of blower fan generating, the curve of line current and time, adopts the same operation in step 2~3 to obtain 80% rated voltage electric current similarity S (I) 80%≈ 0.6398,90% rated voltage electric current similarity S (I) 90%≈ 0.7025; 100% rated voltage electric current similarity S (I) 100%≈ 0.7135; 110% rated voltage electric current similarity S (I) 110%≈ 0.6991; 120% rated voltage electric current similarity S (I) 120%≈ 0.7183.

S ( I ) 80 % = &Sigma; i = 1 n ( &epsiv; i 80 % + &mu; i 80 % ) &times; &Sigma; i = 1 n ( &epsiv; i 80 % &times; &mu; i 80 % ) &times; &Sigma; i = 1 n ( &epsiv; i 80 % - &mu; i 80 % ) - - - ( 10 )

The 5th step: by oscilloscope measurement inverter input line electric current I dC, line voltage U dCline current I with output aC, line voltage U aC, and calculate inverter efficiency eta:

&eta; = U AC &times; I AC U DC &times; I DC &ap; 83.12 % - - - ( 11 )

The 6th step: inverter input voltage is transferred to load voltage value, and regulation output electric current is ratings, reliably working is no less than 8h continuously; Regulation output electric current is 125% ratings, and reliably working is no less than 1min continuously; Input voltage is transferred to 125% ratings, and regulation output electric current is ratings, and reliably working is no less than continuous reliably working and is no less than 10s continuously.Judge in three kinds of situations, whether inverter work normally works.If all can normally work in three kinds of situations, to carry index be D to inverter band p=3;

The 7th step: calculate inverter evaluation index:

Inverter overall similarity evaluation index D s:

D S = S ( I ) 80 % + S ( U ) 80 % 2 + S ( I ) 90 % + S ( U ) 90 % 2 + S ( I ) 100 % + S ( U ) 100 % 2 + S ( I ) 110 % + S ( U ) 110 % 2 + S ( I ) 120 % + S ( U ) 120 % 2 5 &ap; 0.7593

Inverter conversion efficiency evaluation index D η:

D &eta; = &eta; - &eta; B &eta; B &ap; 0.2154 - - - ( 12 )

Continuous duty Performance Evaluating Indexes D pthe 6th step draws as shown.

The 8th step: calculate inverter overall assessment index:

D N=D η+D S+LnD P=2.0733

The 9th step: if D n>=1 explanation inverter is not suitable for accessing this electricity generation system, can not directly be connected in inversion unit and generate electricity by way of merging two or more grid systems.

Claims (7)

1. a wind power generation grid-connected system pick-up unit, is characterized in that: comprise generator unit, secondary battery unit, inversion unit, load simulation and simulating grid unit, control module and detecting unit;
Generator unit comprises aerogenerator and blower fan access controller;
Inversion unit comprises inverter and inverter access controller;
Load simulation and simulating grid unit comprise load selector and fictitious load, grid integration controller and simulating grid;
Control module comprises DSP, memory device and communication module;
Detecting unit comprises fan condition testing agency and electric property testing agency;
Secondary battery unit comprises accumulator, battery controller and Boost circuit;
The concrete connection of device is: aerogenerator is connected to the secondary battery unit with battery controller by aerogenerator access controller, aerogenerator connects the inverter with inverter access controller by aerogenerator access controller, the output of inversion unit is connected to fictitious load through load selector, simulate the load under different detecting patterns, aerogenerator is connected to fan condition testing agency, the output of fan condition testing agency is connected to electric property testing agency, electric property testing agency is connected with simulating grid, simulating grid is connected to the output terminal of inversion unit through grid integration controller, aerogenerator access controller, inverter access controller, load selector, electric property testing agency and grid integration controller are all connected to the IO port of DSP, communication module and memory device are external in DSP.
2. wind power generation grid-connected system pick-up unit as claimed in claim 1, it is characterized in that: the blower fan access controller of described generator unit adopts multiple single-pole single-throw switch (SPST)s, each switch output terminal that wherein one end couples together as generator unit, the other end connects respectively different aerogenerators.
3. wind power generation grid-connected system pick-up unit as claimed in claim 1, it is characterized in that: the inverter access controller of described inversion unit adopts multiple single-pole single-throw switch (SPST)s, lay respectively at input end and the output terminal of inverter, the access of control inverter, the input end of inverter is connected with the output terminal of the output terminal of generator unit and secondary battery unit, and the output terminal of inverter access controller is connected with simulating grid unit with load simulation.
4. wind power generation grid-connected system pick-up unit as claimed in claim 1, it is characterized in that: the load selector of described load simulation and simulating grid unit comprises single-pole single-throw switch (SPST) and control circuit, adopt multiple single-pole single-throw switch (SPST) parallel connections, control circuit is connected to DSP output terminal, control circuit output terminal is connected to single-pole single-throw switch (SPST), fictitious load comprises three kinds: the fictitious load that when islet operation, blower fan detects comprises the isolating switch of series connection and the electric capacity of fuse and three-phase Y-connection, inductance, Resistor Array Projector; The fictitious load that when grid-connected, blower fan detects comprises electric capacity, inductance and the Resistor Array Projector that the isolating switch of series connection is connected with fuse, three-phase hexagon; The fictitious load that when grid-connected, inverter detects comprises fuse, the electric capacity of isolating switch and three-phase Y-connection, corner connection parallel connection, inductance and resistance; Simulating grid comprises holding circuit; mu balanced circuit and tunable capacitor; adjustable resistance; controlled alternating-current voltage source; grid integration controller adopts multiple single-pole single-throw switch (SPST) parallel connections; the input end of grid integration controller is connected with the output of inverter access controller; grid integration controller output end connects holding circuit and mu balanced circuit successively; the three-phase output end of mu balanced circuit connects tunable capacitor and the adjustable resistance after parallel connection; controlled alternating-current voltage source is connected to tunable capacitor after parallel connection and the output terminal of adjustable resistance, forms Y-connection.
5. wind power generation grid-connected system pick-up unit as claimed in claim 1, is characterized in that: the fan condition testing agency of described detecting unit adopts anemoscope; Electric property testing agency comprises power quality analyzer and oscillograph.
6. wind power generation grid-connected system pick-up unit as claimed in claim 1, is characterized in that: the accumulator of described secondary battery unit adopts lead-acid accumulator, in parallel between each accumulator; Battery controller comprises voltage stabilizing chip, power supply control chip and output pressure regulation chip, accumulator connects voltage stabilizing chip input end, the output of voltage stabilizing chip connects the input of power supply control chip, and output pressure regulation chip input end is connected to the output of power supply control chip; The input of Boost circuit is as the input of secondary battery unit, and the output of Boost circuit is connected with the output of battery controller, as the output of secondary battery unit.
7. adopt the detection method of wind power generation grid-connected system pick-up unit claimed in claim 1, it is characterized in that: comprising: when islet operation, the duty of aerogenerator to be measured detects, the duty of aerogenerator to be measured detects and the detection of inverter duty to be measured when grid-connected when grid-connected;
When described islet operation, aerogenerator duty detecting step to be measured is as follows:
Step 1: aerogenerator testing conditions determine: the secondary battery unit of aerogenerator detection system, inverter, transformer, the rated power of load selector and fictitious load is more than or equal to the applied power of aerogenerator;
Step 2: carry out aerogenerator and detect from net power-performance;
Step 2.1: regulate wind speed by DSP, and start aerogenerator, fan condition testing agency is by anemoscope, and power quality analyzer and oscillograph image data, comprising: line voltage, line current and wind speed, set sampling period and sample frequency;
Step 2.2: oscillograph is drawn blower voltage family curve according to the blower fan line voltage gathering, and similarity between calculating and plotting the blower voltage family curve and the blower voltage family curve of standard that go out;
S 1 = ( &Sigma; i = 1 n ( A i + B i ) &Sigma; i = 1 n ( A i &times; B i ) U &OverBar; + &Sigma; i = 1 n ln ( A i 2 + B i 2 ) P &OverBar; ) &times; &Sigma; i = 1 n ( A i - B i ) - - - ( 1 )
Wherein,
S 1, blower voltage family curve similarity;
A i, be the magnitude of voltage on standard time point on the blower voltage family curve obtaining of sampling,
B i, be the magnitude of voltage on standard time point on the blower voltage family curve of standard,
for the mean value of voltage,
for the mean value of power,
N, the number in sampling period;
Step 2.2.1: the data stochastic sampling that oscillograph collection is come, the volt-ampere characteristic typical curve of the data and system storage of sampling is contrasted, calculated the similarity of two curves by formula (1), wherein, system is to gathering 500 points in each clock period;
Step 2.2.2: the overall similarity S that calculates all sampling periods p, the similarity summation in each sampling period is averaged again:
S p = 1 n &Sigma; i = 1 n S 1 i - - - ( 2 )
Step 2.2.3: the mean wind speed that calculates all sampling periods and average power
v &OverBar; = 1 n &Sigma; i = 1 n v i P &OverBar; = 1 n &Sigma; i = 1 n P i
Step 2.3:DSP regulates wind speed again, and repeating step 2.2 wherein, regulates wind speed than the wind speed that increased 1m/s last time at every turn, is limited to 12m/s on wind speed;
Step 3: under different wind friction velocities, detect blower fan duty;
Step 3.1: calculate the overall wind energy efficiency eta of blower fan con;
&eta; con = 2 P n &rho;&pi; R 2 v n 3 - - - ( 3 )
Wherein:
P nfor the whole efficiency of blower fan output
ρ is atmospheric density now
R is flabellum radius
V nfor the wind speed under measuring wind speed now
Step 3.2: the conversion efficiency of every bit in the calculating sampling cycle, draw overall dynamic translation efficiency curve, conversion efficiency adopts following formula to calculate:
η n *=0.8η n+0.1η n-1+0.05η n-2+0.025×η n-3+0.00625×η n-4+0.00625×η n-5+0.00625×η n-6+0.00625×η n-7
Wherein η n *by memory stores, be to be calculated by the value of front 7 sampled points of this sampled point, be mainly the data of storage are carried out to buffer memory and filtering processing, make the powertrace that obtains more level and smooth, maximum reduce the unstable impact that experiment is processed of blower fan physical construction;
Step 3.3, calculates under isolated island condition the job evaluation index D of blower fan vi:
D vi = &eta; vi &times; &rho; v i 10 + 2 ln &Sigma; i = 1 n &Delta; f i + ln &Sigma; i = 1 n ( | P ni - P Bni &OverBar; ) | + S 1 - - - ( 4 )
Wherein:
D vifor the evaluation index of wind speed blower fan in vi situation,
η vifor the conversion efficiency of wind speed blower fan in vi situation,
for within the sampling period, get frequency and the rated frequency of n point difference with,
for within the sampling period, get power and the rated frequency of n point difference with, wherein, P nirepresent the real power of i sampled point in n sampling period, P bnirepresent the calibration power of i sampled point in n sampling period;
Step 3.4, to the job evaluation index D of the blower fan under different vi vid averages;
D = D v 1 + D v 2 + D v 3 &CenterDot; &CenterDot; &CenterDot; D vn - 1 + D vn n - - - ( 5 )
Step 4, checks blower fan current detection environment;
Step 4.1, checks whether electricity generation system meets blower fan testing conditions, enters next step if met, if do not met, the data of gained is considered as to misdata;
Step 4.2, checks whether the curve of drawing out exists data catastrophe point, if existed, checks reason, the data of gained is kept in storer, in order to checking;
Step 5, if D>1, if detected blower fan access electricity generation system is described, cannot normally work the in the situation that of islet operation; If D<1, illustrates that this aerogenerator is applicable to access electricity generation system, can normally work the in the situation that of islet operation;
Described when grid-connected the detecting step of aerogenerator duty to be measured as follows:
Step 1: determine grid-connected testing conditions;
Step 2: gather wind power generation set grid-connection power-performance parameter, set sampling period and sample frequency;
By DSP, wind speed is adjusted to the wind rating of aerogenerator, fan condition testing agency is by anemoscope, and power quality analyzer and oscillograph acquisition parameter data, comprising: line voltage, line current and wind speed;
Step 3: calculate the data of each sampled point in each sampling period, comprise blower fan output voltage, inverter output voltage, blower fan output electric energy frequency, draw out respectively performance graph;
Step 4: calculate blower fan output power and blower fan conversion efficiency according to the line current value of the blower fan output voltage calculating, inverter output voltage, blower fan output electric energy frequency and now blower fan output, and draw corresponding performance graph;
Step 5: blower fan output voltage curve, inverter output voltage curve, blower fan output electric energy frequency curve, blower fan output power curve and the blower fan conversion efficiency curve that calculating and plotting goes out and the similarity S of corresponding typical curve 2:
S 2 = ( &Sigma; i = 1 n ( &alpha; i + &beta; i ) &times; &Sigma; i = 1 n ( &alpha; i &times; &beta; i ) + &Sigma; i = 1 n ln ( &alpha; i 2 + &beta; i 2 ) ) &times; &Sigma; i = 1 n ( &alpha; i - &beta; i ) - - - ( 6 )
Wherein,
α i, represent that measured actual curve is to the distance between initial point;
β i, represent that the corresponding point of typical curve is to the distance between initial point;
Step 5.1: the data stochastic sampling that oscillograph is gathered, the typical curve of the data and system storage of sampling is contrasted, calculate the similarity of two curves, wherein, system, to gathering 500 points in each clock period, is calculated the similarity S in each cycle p, the similarity of data in each sampling period being tried to achieve:
The similarity summation in each sampling period of trying to achieve is made even and is overall similarity S 3:
S 3 = &Sigma; i n ( S p ) n - - - ( 7 )
Step 5.2: blower fan output voltage curve similarity substitution formula (7) is obtained to overall blower fan output voltage similarity S uO; Inverter output voltage curve similarity substitution above formula is obtained to overall inverter output voltage similarity S uO'; Blower fan is exported to electric energy frequency curve similarity substitution above formula and obtain overall blower fan output electric energy frequency similarity S f; Powertrace similarity substitution above formula is obtained to overall blower fan output power similarity S ' p, conversion efficiency curve similarity substitution above formula is obtained to overall blower fan conversion efficiency similarity S η;
Step 6: calculate under grid-connected condition the job evaluation index D of blower fan g:
D G = S UO + S UO &prime; 2 + S F + S &eta; 3 - - - ( 8 )
Wherein:
D gfor the grid-connected job evaluation index of blower fan;
S uOfor blower fan output voltage similarity;
S uO' be inverter output voltage similarity;
S ffor blower fan output electric energy frequency similarity;
S ηfor conversion efficiency similarity;
Step 7: evaluation index judgement, if D g>1, illustrates that this blower fan, cannot normally work when electricity generation system in access grid-connected in the situation that; If D g<1 illustrates that this aerogenerator is applicable to access electricity generation system, can normally work under grid-connected condition;
Described when grid-connected the detecting step of inverter duty to be measured as follows:
The 1st step: the ratings that wind-power generation unit output voltage is adjusted to inverter input voltage; It is rated power that fine setting load makes the output power of inverter, slowly adjusts the output voltage of aerogenerator, inverter output voltage when making it in 80%~120% interior variation of ratings and measuring output voltage difference;
The 2nd step: aerogenerator output voltage is adjusted to inverter input voltage load voltage value 80%; Oscillograph is connected to inverter output end to be tested; Draw inverter output voltage and the curve of time, calculate voltage under standard 80% rated voltage in itself and storer and the similarity of time curve:
S ( U ) 80 % = &Sigma; i = 1 n ( &alpha; i 80 % + &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % &times; &beta; i 80 % ) &times; &Sigma; i = 1 n ( &alpha; i 80 % - &beta; i 80 % ) - - - ( 9 )
The 3rd step: the output voltage of aerogenerator is changed to 90% rated voltage, calculates 90% rated voltage similarity S (U) 90%; The output voltage of aerogenerator is changed to 100% rated voltage, calculates 100% rated voltage voltage similarity S (U) 100%; The output voltage of aerogenerator is changed to 110% rated voltage, calculates 110% rated voltage voltage similarity S (U) 110%; The output voltage of aerogenerator is changed to 120% rated voltage, calculates 120% rated voltage voltage similarity S (U) 120%;
The 4th step: draw 80%~120% time in rated voltage of blower fan generating, the curve of line current and time, adopts the same operation in step 2~3 to obtain 80% rated voltage electric current similarity S (I) 80%, 90% rated voltage electric current similarity S (I) 90%; 100% rated voltage electric current similarity S (I) 100%; 110% rated voltage electric current similarity S (I) 110%; 120% rated voltage electric current similarity S (I) 120%;
The 5th step: by oscilloscope measurement inverter input line electric current I dC, line voltage U dCline current I with output aC, line voltage U aC, and calculate inverter efficiency eta:
&eta; = U AC &times; I AC U DC &times; I DC - - - ( 11 )
The 6th step: inverter input voltage is transferred to load voltage value, and regulation output electric current is ratings, reliably working is no less than 8h continuously; Regulation output electric current is 125% ratings, and reliably working is no less than 1min continuously; Input voltage is transferred to 125% ratings, and regulation output electric current is ratings, and reliably working is no less than continuous reliably working and is no less than 10s continuously; Judge in three kinds of situations, whether inverter work normally works: if all can normally work in three kinds of situations, to carry index be D to inverter band p=3; In two kinds of situations, can normally work, band carries index D p=1.5; If all cisco unity malfunction band carries index D in three kinds of situations p=0;
The 7th step: calculate inverter evaluation index:
Inverter overall similarity evaluation index D s:
D S = S ( I ) 80 % + S ( U ) 80 % 2 + S ( I ) 90 % + S ( U ) 90 % 2 + S ( I ) 100 % + S ( U ) 100 % 2 + S ( I ) 110 % + S ( U ) 110 % 2 + S ( I ) 120 % + S ( U ) 120 % 2 5
Inverter conversion efficiency evaluation index D η:
D &eta; = &eta; - &eta; B &eta; B - - - ( 12 )
Continuous duty Performance Evaluating Indexes D pthe 6th step draws as shown;
The 8th step: calculate inverter overall assessment index:
D N=D η+D S+LnD P
The 9th step: if D n≤ 1 explanation inverter is adapted at generating electricity by way of merging two or more grid systems in accessed electricity generation system; Otherwise inverter, is not suitable for accessing this electricity generation system, can not directly be connected in inversion unit and generate electricity by way of merging two or more grid systems.
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