CN109888831B - Control parameter identification method based on virtual synchronous generator - Google Patents
Control parameter identification method based on virtual synchronous generator Download PDFInfo
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Abstract
The invention provides a control parameter identification method based on a virtual synchronous generator, which comprises the following steps: detecting the wind speed of a controlled fan in the current environment, wherein the fan outputs the relation between active power and the current wind speed; identifying parameters aiming at the fan system; calculating u sd ,u sq (ii) a Performing voltage correction u 'according to different wind speeds' sd ,u' sq Identifying and calculating; use of Voltage correction u 'under different wind speed conditions' sd ,u' sq And controlling the output voltage of the converter according to the parameters. According to the method, voltage quality related parameters are identified according to different current wind speeds, different formulas are adopted to identify different output conditions of the wind turbine generator set under different wind speeds, after the identified parameters are subjected to corresponding PI control, the pulse signals generated by SVPWM are used for controlling the converter, and the generated voltage is more stable.
Description
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a control parameter identification method based on a virtual synchronous generator.
Background
With the development and the development of the virtual synchronous generator technology, the wind turbine converter controls the virtual synchronous generator, automatically adjusts the power output of the wind turbine converter according to the load fluctuation condition, and ensures the voltage stability of the power system. According to the method, on the basis of a mathematical model of the double-fed asynchronous wind driven generator, relevant parameters of a converter of the wind turbine grid connection are identified, and corresponding variables are adjusted through analysis of the obtained parameters, so that the wind turbine generator provides safer and more stable electric energy when the wind turbine generator is connected to the grid. Because the output of the fan is different under different weather conditions, the method for automatically adjusting the parameter identification enables the identified parameter result to be optimal and the control to be safer and more reliable according to the size of the wind speed.
Disclosure of Invention
The invention provides a control parameter identification method based on a virtual synchronous generator, which comprises the following specific processes:
wherein,
rated output power of wind power;v ci for cutting into the wind speed, v r Rated wind speed, v co Cutting out the wind speed;
and different online identification methods are adopted according to different wind speeds. And according to the difference of the output power of the fan at different wind speeds, performing compensation methods in different modes, and identifying corresponding parameters.
Step 2: carrying out parameter u for following fan system sd ,u sq Identification of u sd ,u sq The d-axis component and the q-axis component of the stator voltage of the wind driven generator in a d-q coordinate system respectively, and the fan system comprises: the wind wheel, the gear box, the wind driven generator, the rotor side converter, the grid side converter and the grid-connected switch are arranged on the wind wheel; the wind wheel is connected with a gear box, the gear box is connected with a wind driven generator, a rotor of the wind driven generator is connected with a rotor-side converter, the rotor-side converter is connected with a grid-side converter through a direct current bus, the grid-side converter is connected with a power grid through a grid-connected switch, and a stator of the wind driven generator is connected with the power grid through the grid-connected switch;
step 3. calculate u sd ,u sq : setting stator winding resistance R s (ii) a Stator voltage frequency omega s F 50Hz, the dq-axis component ψ of the stator flux linkage sd ＝L s i sd +L m i rd ，ψ sq ＝L s i sq +L m i rq ，L s ，L m For rotor winding inductance and inter-winding mutual inductance, i sd ,i rd Component of stator and rotor currents on d-axis, i sq ,i rq The components of the stator current and the rotor current on the q axis respectively are shown as follows:
calculating to obtain u through different wind speeds sd ,u sq Respectively representing the q-axis components of the stator voltage in a d-q coordinate system; wherein R is s Resistance of the stator winding; omega s For stator voltage frequency, psi sd ,ψ sq Dq/abc, respectively, of the dq-axis component of the stator flux linkageAnd the three-phase voltage of the converter.
Step 4, performing voltage correction u 'according to different wind speeds' sd ,u' sq And (3) identification calculation:
when v is more than or equal to 0 h ≤v ci Or v h ≥v co When the utility model is used, the water is discharged,
when v is ci ≤v h ≤v r When the temperature of the water is higher than the set temperature,
when v is r ≤v h ≤v co When the temperature of the water is higher than the set temperature,
u 'is corrected by voltage under different wind speed conditions' sd ,u' sq And controlling the output voltage of the converter according to the parameters.
The beneficial technical effects are as follows:
according to the method, voltage quality related parameters are identified according to different current wind speeds, different formulas are adopted to identify different output conditions of the wind turbine generator set under different wind speeds, after the identified parameters are subjected to corresponding PI control, the pulse signals generated by SVPWM are used for controlling the converter, and the generated voltage is more stable.
Drawings
Fig. 1 is a flowchart of a control parameter identification method based on a virtual synchronous generator according to an embodiment of the present invention;
FIG. 2 is a control diagram of a wind turbine rotor side converter of an embodiment of the present invention;
fig. 3 is a comparison graph of the results before and after using a control parameter identification method based on a virtual synchronous generator according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments, and the invention provides a control parameter identification method based on a virtual synchronous generator, as shown in fig. 1, the specific flow is as follows:
wherein,
rated output power of wind power; v. of ci For cutting into the wind speed, v r At rated wind speed, v co Cutting out the wind speed;
and different online identification methods are adopted according to different wind speeds. And according to the difference of the output power of the fan at different wind speeds, performing compensation methods in different modes and identifying corresponding parameters.
In a wind farm, the cut-in wind speed v of a fan is set ci Rated wind speed v of 3m/s r Cut-out wind speed v of 8m/s co The rated power of a single fan is 1.5MW at 30m/s, and the wind speed in the current environment is 16 m/s.
According to the conditions, the active power P output by the fan is carried out WTG The calculation of (2) can be obtained by the formula (1), and the output power of a single fan is 1.5 MW;
step 2: carrying out parameter u for following fan system sd ,u sq Identification of u sd ,u sq The d-axis component and the q-axis component of the stator voltage of the wind driven generator in a d-q coordinate system respectively, and the fan system comprises: the wind wheel, the gear box, the wind driven generator, the rotor side converter, the grid side converter and the grid-connected switch are arranged on the wind wheel; the wind wheel is connected with a gear box, the gear box is connected with a wind driven generator, a rotor of the wind driven generator is connected with a rotor side converter, and the rotorThe side converter is connected with the grid-side converter through a direct-current bus, the grid-side converter is connected with a power grid through a grid-connected switch, and the wind driven generator stator is connected with the power grid through the grid-connected switch; FIG. 2 is a control diagram of a wind turbine rotor side converter with a parameter u for stability control rd ,u rq The identification of (2) obtains control parameters which enable the system to be more stable.
FIG. 2 is a control diagram of a wind turbine rotor side converter with a parameter u for stability control sd ,u sq The identification of (2) obtains control parameters which enable the system to be more stable.
Step 3. calculate u sd ,u sq : setting stator winding resistance R s (ii) a Stator voltage frequency omega s F 50Hz, the dq-axis component ψ of the stator flux linkage sd ＝L s i sd +L m i rd ，ψ sq ＝L s i sq +L m i rq ，L s ，L m The inductance of the rotor winding and the mutual inductance between the windings are obtained. i.e. i sd ,i rd Component of stator and rotor currents on d-axis, i sq ,i rq The components of the stator current and the rotor current on the q axis respectively are shown as follows:
u is obtained by calculating different wind speeds sd ,u sq Respectively representing the q-axis components of the stator voltage in a d-q coordinate system; wherein R is s Resistance of the stator winding; omega s For stator voltage frequency, # sd ,ψ sq And dq axis components of the stator flux linkage are respectively converted into three-phase voltage of the converter by dq/abc.
Setting stator winding resistance R s 0.05 Ω; stator voltage frequency omega s 2 pi f, f 50Hz, dq component ψ of the stator flux linkage sd ＝L s i sd +L m i rd ，ψ sq ＝L s i sq +L m i rq ，L s ＝0.1H，L m 0.1H isRotor winding inductance and mutual inductance between the windings. i all right angle sd ,i rd ，i sq ,i rq The components of the stator and rotor currents on the dq axis, respectively.
And d, dq/abc conversion is carried out to obtain the three-phase voltage of the converter, and the voltage is corrected through a corresponding formula to obtain a control variable which is more in line with the actual adjustment voltage. u. u sd ,u sq The parameter identification is performed on the premise of the following formula.
The above formula can be simplified by substituting known data into the above formula
Step 4, performing voltage correction u 'according to different wind speeds' sd ,u' sq And (3) identification calculation: the wind speed under the current environment is 16m/s, and is calculated by the formula (4)
Can obtain the product
Identifying u under different wind speed conditions through the above calculation sd ,u sq And comparing the obtained identification parameters with the original parameters, and obtaining a voltage simulation result, wherein the control effect after parameter identification enables the output voltage of the converter to be more stable. The simulation diagram is shown in fig. 3.
Claims (1)
1. A control parameter identification method based on a virtual synchronous generator is characterized by comprising the following specific steps:
step 1: detecting the wind speed of the controlled fan in the current environment, and outputting active power P by the fan WTG With the current wind speed v h The relationship between them is disclosedFormula (1);
wherein,
rated output power of wind power; v. of ci For cutting into the wind speed, v r Rated wind speed, v co Cutting out the wind speed;
step 2: carrying out parameter u for following fan system sd ,u sq Identification of u sd ,u sq The d-axis component and the q-axis component of the stator voltage of the wind driven generator in a d-q coordinate system respectively, and the fan system comprises: the wind wheel, the gear box, the wind driven generator, the rotor side converter, the grid side converter and the grid-connected switch are arranged on the wind wheel; the wind wheel is connected with a gear box, the gear box is connected with a wind driven generator, a rotor of the wind driven generator is connected with a rotor-side converter, the rotor-side converter is connected with a grid-side converter through a direct current bus, the grid-side converter is connected with a power grid through a grid-connected switch, and a stator of the wind driven generator is connected with the power grid through the grid-connected switch;
and step 3: calculating u sd ,u sq : setting stator winding resistance R s (ii) a Stator voltage frequency omega s F 50Hz, the dq-axis component ψ of the stator flux linkage sd ＝L s i sd +L m i rd ，ψ sq ＝L s i sq +L m i rq ，L s ，L m For rotor winding inductance and inter-winding mutual inductance, i sd ,i rd Component of stator and rotor currents on d-axis, i sq ,i rq The components of the stator and rotor currents on the q axis are respectively represented by the following formula:
calculating to obtain u through different wind speeds sd ,u sq Respectively representing d-axis components and q-axis components of the stator voltage in a d-q coordinate system; wherein R is s Resistance of the stator winding; omega s For stator voltage frequency, # sd ,ψ sq The dq-axis components of the stator flux linkage, respectively;
and 4, step 4: performing voltage correction u 'according to different wind speeds' sd ,u' sq And (3) identification calculation:
when v is more than or equal to 0 h <v ci Or v h >v co When the temperature of the water is higher than the set temperature,
when v is ci ≤v h ≤v r When the temperature of the water is higher than the set temperature,
when v is r <v h ≤v co When the temperature of the water is higher than the set temperature,
use of Voltage correction u 'under different wind speed conditions' sd ,u' sq And controlling the output voltage of the converter according to the parameters.
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Citations (2)
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|---|---|---|---|---|
| CN102082543A (en) * | 2010-10-28 | 2011-06-01 | 天津大学 | Method for controlling double-feed wind driven generator under imbalanced power grid voltage |
| US20120056602A1 (en) * | 2010-08-25 | 2012-03-08 | Shuhui Li | Control of a permanent magnet synchronous generator wind turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120056602A1 (en) * | 2010-08-25 | 2012-03-08 | Shuhui Li | Control of a permanent magnet synchronous generator wind turbine |
| CN102082543A (en) * | 2010-10-28 | 2011-06-01 | 天津大学 | Method for controlling double-feed wind driven generator under imbalanced power grid voltage |
Non-Patent Citations (3)
| Title |
|---|
| Test-Bed of Doubly Fed Induction Generator for Variable-Speed Constant-Frequency Wind Power Generation;S.Y.Yang,et al;《2006 CES/IEEE 5th International Power Electronics and Motion Control Conference》;20090210;第1-5页 * |
| 双馈风力发电机的虚拟惯量控制及稳定性分析;赵勇;《可再生能源》;20181031;第36卷(第10期);第1523-1528页 * |
| 基于MAS的多时间尺度微电网电压无功控制方法研究;奚媛媛;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20170315;第22-23页 * |
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