CN102142685B - Software design method for inductor-capacitor-inductor (LCL) filter on network side of directly-driven wind power generation converter - Google Patents

Software design method for inductor-capacitor-inductor (LCL) filter on network side of directly-driven wind power generation converter Download PDF

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CN102142685B
CN102142685B CN2011100646477A CN201110064647A CN102142685B CN 102142685 B CN102142685 B CN 102142685B CN 2011100646477 A CN2011100646477 A CN 2011100646477A CN 201110064647 A CN201110064647 A CN 201110064647A CN 102142685 B CN102142685 B CN 102142685B
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张波涛
武美娜
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Jiangsu Daqo Kfine Electric Co Ltd
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Abstract

The invention relates to a software design method for an inductor-capacitor-inductor (LCL) filter on a network side of a directly-driven wind power generation converter. The parameter combination of an inductor L1 which is connected with an inverter part of the converter directly in the LCL filter, an inductor L2 which is connected with a grid part directly, and a filter capacitor C which is connected to a node between the L1 and the L2 is determined by the following steps of: 1, selecting an initial parameter; 2, converting the L1 to carry out simulation analysis on the basis of the initial parameter, so as to determine an L1 value; 3, converting the L2 repeatedly to carry out the simulation analysis on the basis of the step 2, so as to determine an L2 value; 4, converting a value of the capacitor C repeatedly to carry out the simulation analysis on the basis of the step 3, so as to determine a C value; and 5, executing the steps 2 to 4 repeatedly for given times, so as to obtain the final L1 value, the final L2 value and the final C value. By the method, design efficiency and accuracy are improved, and the harmonic content of the network side of the wind power generation converter is reduced.

Description

The software design approach of direct-driving type wind power generation current transformer net side LCL filter
Technical field
The present invention relates to the product design method in the wind power equipment manufacturing technology, specifically a kind of software design approach of direct-driving type wind power generation current transformer net side LCL filter.
Background technology
In direct-drive wind-force generating converter, in order to reduce the electric current higher harmonic content of grid side current transformer, need to make it pass through L or the LCL filter connects with electrical network.Because the LCL filter can reduce the value of inductance, reduce the cost of filter, improve dynamic performance, therefore the LCL filter more is applicable to powerful wind generator system.But it is improper that the LCL filter parameter is selected, and filter does not reach the effect of effective filtering.Therefore the designing and calculating of LCL filter parameter is particularly important.Be designed into about LCL and all do not form so far standard both at home and abroad, because all do not select preferably up to now the method for optimized parameter.
The symmetrical configuration of the three-phase LCL line filter in the wind-force generating converter, the structure of its each phase as shown in Figure 1, comprise directly being connected inductance L 2 with being connected with electrical network part with the direct-connected inductance L 1 of current transformer inverter section, and be connected to filter capacitor C on the node between L1, the L2.
Write S territory electric current and voltage equation according to Fig. 1 row:
（1）
Figure 2011100646477100002DEST_PATH_IMAGE002
（2）
Figure 906623DEST_PATH_IMAGE003
（3）
Figure 2011100646477100002DEST_PATH_IMAGE004
（4）
Can get thus LCL filter to output current I 2With input voltage U InBetween transfer function G LCL(s) be:
（5）
Because R 1And R 2Be the spurious impedance of inductance, impedance is very little, therefore can ignore R 1And R 2Then circuit diagram such as Fig. 2.
According to the circuit of Fig. 2, transfer function G LCL(s) be:
Figure 2011100646477100002DEST_PATH_IMAGE006
（6）
One of them limit is zero, and two other limit is plural number.If replace s with jw, also therefore obtained resonance frequency.Formula is as follows:
Figure 35302DEST_PATH_IMAGE007
（7）。
Summary of the invention
Technical problem to be solved by this invention is that providing a kind of can be in optimized selection inductance and the capacitance parameter of said structure LCL filter, reduces the software design approach of the direct-driving type wind power generation current transformer net side LCL filter of power network current harmonic wave.
Method of the present invention is determined in the LCL filter with the direct-connected inductance L 1 of current transformer inverter section, partly directly is connected inductance L 2 with electrical network through following steps, and the parameter combinations that is connected to the filter capacitor C on the node between L1, the L2:
Step 1, the selection of initial parameter, comprising
A. select the method for L1 value, according to following formula
Figure 2011100646477100002DEST_PATH_IMAGE008
（8）
Figure 805681DEST_PATH_IMAGE009
（9）
Figure 2011100646477100002DEST_PATH_IMAGE010
（10）
In the formula, inverter output rated power is P, and specified output phase voltage is U 0, output-current rating is i Rated, grid line voltage U, inductive current ripple i Rip, the current transformer DC input voitage is U Dc, fundamental frequency is f s, switching frequency is f Sw, the span of m is 10% ~ 25%;
B. select the method for L2 value, according to following formula
（11）
The span of coefficient k is between 0～1 in the formula;
C. select the method for capacitor C, according to following formula
Figure 2011100646477100002DEST_PATH_IMAGE012
（12）
Figure 168234DEST_PATH_IMAGE013
（13）
Figure 2011100646477100002DEST_PATH_IMAGE014
（14）
Choose the initial parameter of one group of L1, L2 and C by above-mentioned steps a, b, c, initial parameter is carried out simulation analysis, obtain corresponding with it current harmonic content data, enter next step; The constraints of step 1 is: the scope of the resonance frequency that filter is intrinsic should be between 10 times fundamental frequency and 1/2 switching frequency; The simulation analysis result of initial parameter must meet the restriction of constraints, otherwise should adjust.
Step 2, on the basis of initial parameter, value according to the step a in the above-mentioned steps one, many conversion m of b, do not change the value of coefficient k and the value of capacitor C, many groups L1, the L2 of acquisition and the value of C are carried out simulation analysis, relatively the simulation analysis result determines a L1 value that harmonic content is less, enters a step;
Step 3 is on the basis of step 2, according to the step b in the above-mentioned steps one, the value of conversion coefficient k repeatedly, and the value of L1 and C is constant is carried out simulation analysis with the many groups L1, the L2 that obtain and the value of C, relatively the simulation analysis result determines a L2 value that harmonic content is less, enters a step;
Step 4 is on the basis of step 3, according to the step c in the above-mentioned steps one, the value of repeatedly conversion capacitor C, and the value of L1 and L2 is constant, and many groups L1, the L2 of acquisition and the value of C are carried out simulation analysis, and relatively the simulation analysis result determines a C value that harmonic content is less;
Step 5, repeatedly repeating step two is to step 4, and the initial parameter in a group of L1, the L2 that at every turn repeats to determine with last step 2 to step 4 and the parameter value replacement step two of C until finish the number of repetition of setting, obtains the value of final L1, L2 and C.
In the above-mentioned steps, described simulation analysis is the matlab simulation analysis.
Above-mentioned steps two to the number of repetition of step 4 is 10～20 times.
The present invention can carry out software simulation to wind-powered electricity generation with the net side filter component parameters of current transformer by computer and select, efficient and the accuracy of design have been improved, through verification experimental verification, the parameter that this method for designing obtains can be controlled the harmonic content of the current on line side of wind electric converter effectively.
Description of drawings
Fig. 1 is the circuit theory diagrams of common LCL line filter;
Fig. 2 is the simplification circuit theory diagrams of Fig. 1;
Fig. 3 is the flow chart of the inventive method embodiment.
Embodiment
The embodiment of the inventive method is as follows:
1. step 1, the design of LCL initial parameter
1.1 choosing of inductance L 1
The minimum value of output inductor is determined by the inductive current ripple of setting.If inverter output rated power is P, specified output phase voltage is U0, and output-current rating is irated, the grid line voltage U, and inductive current ripple irip, the current transformer DC input voitage is Udc, and fundamental frequency is fs, and switching frequency is fsw
Rated current:
Figure 415675DEST_PATH_IMAGE008
（8）
Relation for the 3-phase power converter output current ripple of SPWM modulation and filter inductance is as follows:
Figure 486399DEST_PATH_IMAGE009
（9）
Figure 726757DEST_PATH_IMAGE010
（10）
Wherein, in the formula (9), the span of m is 10% ~ 25%.
1.2 choosing of inductance L 2
If inductance L value too senior general makes the dynamic response of system slack-off, the too little pulsation that then can increase output of L value increases loss.Different according to different systems to the selection principle of inductance L 2, general power taking sense L2=k*L1, k is that a coefficient is between 0 ~ 1,
Be that inductance L 2 is:
Figure 566537DEST_PATH_IMAGE011
（11）
1.3 choosing of electric capacity
For electrical network, our used load all is inductive load mostly, so shunt capacitance has very great help to the raising of power factor.Choose electric capacity and will consider the reactive power of current transformer generation and the size of inductance L 1.The larger output voltage THD of capacitor C value can be less, but the idle of generation also can be more, and is just larger by the electric current of L1 and switch, also can increase system bulk simultaneously; Capacitance can not be too little, otherwise the larger inductance of need satisfies the needs of current attenuation, so that the pressure drop on the inductance becomes large.The theory of electric capacity all is from reactive power absorption and these two angles of resonance frequency among this design LCL, and the appearance of power taking here reactive power that C produces is 15% rated power.
（12）
Figure 277321DEST_PATH_IMAGE013
（13）
Electric capacity:
Figure 321369DEST_PATH_IMAGE014
（14）
1.4 constraints
The scope of the resonance frequency that filter is intrinsic should between 10 times fundamental frequency and 1/2 switching frequency, mainly be for fear of hanging down and higher frequency spectrum resonance problems partly.Three filtering parameter L1, L2, C choose the restriction that must meet constraints.
Constraints:
Figure 15656DEST_PATH_IMAGE015
（15）
2. step 2～step 6 at initial parameter basis cocycle simulation analysis, obtains and verifies final value
2.1 step 2 changes the value of L1 and carries out simulation analysis, the comparative analysis result selects the value of L1;
2.2 step 3 is calculated the scope of L2 and is got median; Change the value of L2 and carry out simulation analysis, the comparative analysis result selects the value of L2;
2.3 step 4 changes the value of C and carries out simulation analysis, comparative effectiveness figure selects the value of C;
2.4 step 5, repeating step two～step 4, number of repetition 20 obtains final value.
Can carry out verification experimental verification and correction to L1, the L2 of acquisition and the final value of C at last.
Selection for the LCL parameter, because some parameter is a value range rather than a definite value in the design formula, therefore be a process of constantly calculating and repeatedly verifying to the design of filter parameter, in the flow chart of the utility model embodiment shown in Figure 3, N is for carrying out one group of L1, L2, the cycle-index of C simulation analysis can be got the number between 10 to 20.

Claims (3)

1. the software design approach of a direct-driving type wind power generation current transformer net side LCL filter is characterized in that: the parameter combinations that it is determined in the LCL filter directly to be connected inductance L 2 with the direct-connected inductance L 1 of current transformer inverter section, with the electrical network part with following step and is connected to the filter capacitor C on the node between L1, the L2:
Step 1, the selection of initial parameter, comprising
A. select the method for L1 value, according to following formula
Figure FDA00002118823600012
Figure FDA00002118823600013
In the formula, inverter output rated power is P, and specified output phase voltage is U 0, output-current rating is i Rated, inductive current ripple i Rap, the current transformer DC input voitage is U Dc, fundamental frequency is f s, switching frequency is f Sw, the span of m is 10%～25%;
B. select the method for L2 value, according to following formula
L 2＝k×L 1 （11）
The span of coefficient k is between 0～1 in the formula;
C. select the method for capacitor C, according to following formula
Figure FDA00002118823600014
Figure FDA00002118823600015
C≤15%C b （14）
Choose the initial parameter of one group of L1, L2 and C by above-mentioned steps a, b, c, initial parameter is carried out simulation analysis, obtain corresponding with it current harmonic content data, enter next step; The constraints of step 1 is: the scope of the resonance frequency that filter is intrinsic should be between 10 times fundamental frequency and 1/2 switching frequency; The simulation analysis result of initial parameter must meet the restriction of constraints, otherwise should adjust,
Step 2, on the basis of initial parameter, value according to the step a in the above-mentioned steps one, many conversion m of b, do not change the value of coefficient k and the value of capacitor C, many groups L1, the L2 of acquisition and the value of C are carried out simulation analysis, relatively the simulation analysis result determines a L1 value that harmonic content is less, enters a step;
Step 3 is on the basis of step 2, according to the step b in the above-mentioned steps one, the value of conversion coefficient k repeatedly, and the value of L1 and C is constant is carried out simulation analysis with the many groups L1, the L2 that obtain and the value of C, relatively the simulation analysis result determines a L2 value that harmonic content is less, enters a step;
Step 4 is on the basis of step 3, according to the step c in the above-mentioned steps one, the value of repeatedly conversion capacitor C, and the value of L1 and L2 is constant, and many groups L1, the L2 of acquisition and the value of C are carried out simulation analysis, and relatively the simulation analysis result determines a C value that harmonic content is less;
Step 5, repeatedly repeating step two is to step 4, and the initial parameter in a group of L1, the L2 that at every turn repeats to determine with last step 2 to step 4 and the parameter value replacement step two of C until finish the number of repetition of setting, obtains the value of final L1, L2 and C.
2. the software design approach method of direct-driving type wind power generation current transformer net side LCL filter according to claim 1, it is characterized in that: described simulation analysis is the matlab simulation analysis.
3. the software design approach method of direct-driving type wind power generation current transformer net side LCL filter according to claim 1 and 2, it is characterized in that: described step 2 to the number of repetition of step 4 is 10～20 times.
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CN101494385A (en) * 2009-02-18 2009-07-29 常州瑞闪新能源有限公司 Solar photovoltaic parallel inverter control system based on LCL filtering
CN101847877A (en) * 2010-06-02 2010-09-29 四川吉风电源科技有限公司 Frequency conversion control system of double-fed asynchronous wind power generator
CN101950983A (en) * 2010-10-08 2011-01-19 天津理工大学 Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control

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CN101494385A (en) * 2009-02-18 2009-07-29 常州瑞闪新能源有限公司 Solar photovoltaic parallel inverter control system based on LCL filtering
CN101847877A (en) * 2010-06-02 2010-09-29 四川吉风电源科技有限公司 Frequency conversion control system of double-fed asynchronous wind power generator
CN101950983A (en) * 2010-10-08 2011-01-19 天津理工大学 Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control

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Address after: 212200 Jiangsu Daquan Kaifan Electric Appliance Co., Ltd., Yihe Road, Yangzhong Development Zone, Zhenjiang City, Jiangsu Province

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