CN112217237B - Active damping control method for direct-driven wind power grid-connected system under asymmetric fault - Google Patents
Active damping control method for direct-driven wind power grid-connected system under asymmetric fault Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses an active damping control method of a direct-driven wind power grid-connected system under an asymmetric fault, which is used for improving the dynamic stability of the direct-driven wind power grid-connected system during the asymmetric short-circuit fault of a power grid; according to the method, the interaction between the positive and negative sequence current loops of the grid-side converter of the direct-driven wind power grid-connected system and the power grid impedance under the asymmetric fault of the power grid is considered, active damping is introduced through a high-pass filter and a virtual resistor to inhibit the positive and negative sequence harmonic current of the power grid, and the dynamic stability of the system is improved. According to the invention, on the basis of not changing the parameters and the structure of the internal controller, the dynamic stability of the direct-drive wind power grid-connected system under the asymmetric fault of the power grid can be obviously improved only by introducing virtual impedance based on the addition of the high-pass filter.
Description
Technical Field
The invention relates to an improved active damping control method of a direct-drive wind power grid-connected system, which is applicable to a grid-side converter of the direct-drive wind power grid-connected system under the asymmetric fault of an alternating-current power grid.
Background
With the gradual increase of the permeability of the new energy power generation in the electric power system, the electric network has the characteristics of low inertia, weak synchronization and the like. In addition, the large-scale wind power generation field is generally connected to a power grid through a longer transmission line and high impedance, when the power grid has short-circuit fault, the interaction between the output current of the direct-drive wind power grid-connected system and the impedance of the line is aggravated, the dynamic stability of the system during low-voltage ride-through can be deteriorated, and even the system is caused to greatly interfere with instability, so that the low-voltage ride-through can not be successfully realized. Considering that the asymmetric faults are most common in grid faults, the dynamic stability problem of the direct-drive wind power grid-connected system under the asymmetric grid fault condition is more serious. Therefore, the dynamic stability of the direct-driven wind power grid-connected system under the asymmetric short circuit fault is improved, and the safe and stable operation capacity of the power grid can be effectively improved. At present, the students at home and abroad have developed related researches, such as the following published documents:
[1]Yipeng Song,Xiongfei Wang,Frede Blaabjerg.High Frequency Resonance Damping of DFIG based Wind Power System under Weak Network[J].IEEE Trans.Power Electron.2017,32(3):1927–1940.
[2]Jintao Guo,Tao Jin,Mengqi Wang.A coordinated controlling strategy in current and power quality for grid-connected inverter under unbalanced grid voltage[C].2019IEEE Sustainable Power and Energy Conference(iSPEC).IEEE,2019:1183-1188.
document [1] proposes a damping control based on a virtual positive capacitor or virtual negative inductor, which is added to a current control loop to suppress harmonic current, thereby improving dynamic stability of a new energy grid-connected inverter, but the active damping control method relies on accurate resonance frequency detection, and does not consider a control strategy of a negative sequence current control loop in an asymmetric fault scenario, and cannot be applied in the asymmetric fault scenario. The literature [2] proposes a flexible control strategy to suppress power oscillation and current harmonics of the grid-connected inverter under asymmetric grid faults, but the literature ignores the influence of PLL dynamics on system stability under asymmetric grid fault conditions, in fact, as the grid impedance increases, the interaction of PLL and current control loop increases, further deteriorating the small signal stability of the grid-connected inverter under grid faults.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an active damping control method for a direct-driven wind power grid-connected system under an asymmetric short circuit fault, and the method can remarkably improve the dynamic stability of the direct-driven wind power grid-connected system under the asymmetric fault of a power grid.
The technical scheme of the invention is realized as follows:
an active damping control method of a direct-driven wind power grid-connected system under an asymmetric fault is used for improving dynamic stability of the direct-driven wind power grid-connected system during an asymmetric short-circuit fault of a power grid; according to the method, the interaction between the positive and negative sequence current loops of the grid-side converter of the direct-driven wind power grid-connected system and the power grid impedance under the asymmetric fault of the power grid is considered, active damping is introduced through a high-pass filter and a virtual resistor to inhibit the positive and negative sequence harmonic current of the power grid, and the dynamic stability of the system is improved.
The method comprises the following specific steps of;
a1 Grid-side converter of direct-driven wind power grid-connected system in asymmetric fault period of power grid adopts a positive-negative sequence current control loop, and positive-negative sequence control voltage V is calculated according to the following formula dq+ And V dq- ：
In the method, in the process of the invention,is that the direct-driven wind power grid-connected system is connected to a power grid during an asymmetric fault periodPositive sequence current reference value +.>Is a negative sequence current reference value under a synchronous rotation coordinate system input to a power grid by a direct-driven wind power grid-connected system during an asymmetric fault period, I dq+ And I dq- Inputting positive and negative sequence currents, k of three-phase currents subjected to coordinate transformation for the collected direct-drive wind power grid-connected system p1 And k i1 The proportional coefficient and the integral coefficient, K, of the current loop PI controller are respectively dq Is a coupling coefficient, s is a differential operator;
a2 Based on step A1), the positive sequence current I dq+ And negative sequence current I dq- The positive and negative sequence harmonic currents are obtained through a high-pass filter, and are respectively fed forward to positive and negative sequence control voltages of the grid-side converter after being amplified through a virtual resistor, so that output current harmonic waves of the direct-drive wind power grid-connected system are restrained, and positive and negative sequence control voltages V after feedforward compensation are carried out dq+_re And V dq-_re The following formula is satisfied:
wherein Z is v Is a virtual impedance that achieves active damping;
a3 Virtual impedance Z v The virtual resistor is composed of a virtual resistor and a high-pass filter, and is calculated according to the following formula:
Z v (s)＝R v ·H filter (s)
wherein R is v Is a virtual resistor; h filter (s) is a high pass filter transfer function, H filter (s)＝s/(s+2πf cut ) The method comprises the steps of carrying out a first treatment on the surface of the s is a differential operator, f cut Is the cut-off frequency of the high pass filter;
a4 Step A2) and step A3) combining the virtual impedance Z v After the direct-drive wind power grid-connected system is introduced, positive and negative sequence of a grid-side converter of the direct-drive wind power grid-connected system is remodeled into impedance Z vsc_re The following formula is satisfied:
active damping control of the direct-driven wind power grid-connected system during the asymmetric fault period can be realized, so that dynamic stability of the system during the asymmetric fault period is improved; v in vsc_re,pn The grid-connected point positive and negative sequence voltage of the direct-drive wind power grid-connected system is I vsc_re,pn Outputting positive and negative sequence currents for the direct-drive wind power grid-connected system; the remodeling impedance satisfies the following equation:
wherein each element of the remodelling impedance matrix is respectively as follows:
wherein,
N(s)＝H PLL (s)H PLL (s±j4πf 1 )；L a 、L b 、L c ABC three-phase line inductance respectively, alpha is operator alpha=e j2/3π ，I 1 、I 2 Respectively a positive sequence fundamental frequency current component and a negative sequence fundamental frequency current component of a power grid, I 1 '、I 2 ' positive sequence fundamental frequency current conjugation and negative sequence fundamental frequency current conjugation respectively, V 1 、V 2 Respectively a positive sequence fundamental frequency voltage component and a negative sequence fundamental frequency voltage component of a grid connection point, V 1 ' and V 2 ' positive sequence fundamental frequency voltage conjugation and negative sequence fundamental frequency voltage conjugation respectively, f 1 For the fundamental frequency of the network, < >>And->The primary phase angles of positive and negative sequence fundamental frequency currents of the power grid are respectively; h i (s)＝k p1 +k i1 /s，k p1 And k i1 The proportional coefficient and the integral coefficient of the current loop PI controller are respectively; />k pp And k pi Proportional and integral coefficients, ω, respectively, of the phase-locked loop 1 Is fundamental frequency angular frequency, ζ is damping ratio, ω n Is the natural oscillation angular frequency; s is the differential operator and j is the imaginary unit.
According to the active damping control method for the direct-driven wind power grid-connected system under the asymmetric short circuit fault, on the basis of not changing the parameters and the structure of the internal controller, the dynamic stability of the direct-driven wind power grid-connected system under the asymmetric fault of the power grid can be remarkably improved only by introducing virtual impedance based on the high-pass filter. The method can inhibit the current harmonic wave of the direct-drive grid-connected system in the period of asymmetric short circuit fault of the power grid, thereby improving the stability of the small signal of the system.
Drawings
FIG. 1 is a schematic diagram of a direct-drive wind power grid-connected system.
Fig. 2 is a schematic diagram of an active damping control method according to the present invention.
Fig. 3 is a simulation waveform diagram before and after the active damping control strategy provided by the invention is adopted when the two-phase short circuit ground fault occurs in the power grid, the positive sequence voltage of the power grid drops to 52% and 62% respectively, and the voltage unbalance coefficient is 61% and 45%.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The method is used for improving the stability of the small signal of the direct-driven wind power grid-connected system under the asymmetric short circuit fault of the power grid. Fig. 1 is a schematic structural diagram of a direct-drive wind power grid-connected system, and fig. 2 is a schematic diagram of an active damping control method provided by the invention. During the asymmetric short-circuit fault of the power grid, the active damping control strategy is adopted, so that the suppression of positive and negative sequence harmonic waves of the output current of the direct-drive wind power grid-connected system can be realized, and the stability of small signals of the direct-drive wind power grid-connected system is further improved.
The specific implementation steps of the invention are as follows:
a1 Grid-side converter of direct-driven wind power grid-connected system in asymmetric fault period of power grid adopts a positive-negative sequence current control loop, and positive-negative sequence control voltage V is calculated according to the following formula dq+ And V dq- ：
In the method, in the process of the invention,is a positive sequence current reference value in a synchronous rotation coordinate system input to a power grid by a direct-driven wind power grid-connected system during an asymmetric fault period, and is +.>Is a negative sequence current reference value under a synchronous rotation coordinate system input to a power grid by a direct-driven wind power grid-connected system during an asymmetric fault period, I dq+ And I dq- Inputting positive and negative sequence currents, k of three-phase currents subjected to coordinate transformation for the collected direct-drive wind power grid-connected system p1 And k i1 The proportional coefficient and the integral coefficient, K, of the current loop PI controller are respectively dq Is a coupling coefficient, s is a differential operator;
a2 Based on step A1), the positive sequence current I dq+ And negative sequence current I dq- The positive and negative sequence harmonic currents are obtained through a high-pass filter, and are respectively fed forward to positive and negative sequence control voltages of the grid-side converter after being amplified through a virtual resistor, so that output current harmonic waves of the direct-drive wind power grid-connected system are restrained, and positive and negative sequence control voltages V after feedforward compensation are carried out dq+_re And V dq-_re The following formula is satisfied:
wherein Z is v Is a virtual impedance that achieves active damping;
a3 Virtual impedance Z v The virtual resistor is composed of a virtual resistor and a high-pass filter, and is calculated according to the following formula:
Z v (s)＝R v ·H filter (s)
wherein R is v Is a virtual resistor; h filter (s) is a high pass filter transfer function, H filter (s)＝s/(s+2πf cut ) The method comprises the steps of carrying out a first treatment on the surface of the s is a differential operator, f cut Is the cut-off frequency of the high pass filter;
a4 Step A2) and step A3) combining the virtual impedance Z v After the direct-drive wind power grid-connected system is introduced, positive and negative sequence of a grid-side converter of the direct-drive wind power grid-connected system is remodeled into impedance Z vsc_re The following formula is satisfied:
active damping control of the direct-driven wind power grid-connected system during the asymmetric fault period can be realized, so that dynamic stability of the system during the asymmetric fault period is improved; v in vsc_re,pn The grid-connected point positive and negative sequence voltage of the direct-drive wind power grid-connected system is I vsc_re,pn Outputting positive and negative sequence currents for the direct-drive wind power grid-connected system; the remodeling impedance satisfies the following equation:
wherein each element of the remodelling impedance matrix is respectively as follows:
wherein,
N(s)＝H PLL (s)H PLL (s±j4πf 1 )；L a 、L b 、L c ABC three-phase line inductance respectively, alpha is operator alpha=e j2/3π ，I 1 、I 2 Respectively a positive sequence fundamental frequency current component and a negative sequence fundamental frequency current component of a power grid, I 1 '、I 2 ' positive sequence fundamental frequency current conjugation and negative sequence fundamental frequency current conjugation respectively, V 1 、V 2 Respectively a positive sequence fundamental frequency voltage component and a negative sequence fundamental frequency voltage component of a grid connection point, V 1 ' and V 2 ' positive sequence fundamental frequency voltage conjugation and negative sequence fundamental frequency voltage conjugation respectively, f 1 For the fundamental frequency of the network, < >>And->The primary phase angles of positive and negative sequence fundamental frequency currents of the power grid are respectively; h i (s)＝k p1 +k i1 /s，k p1 And k i1 The proportional coefficient and the integral coefficient of the current loop PI controller are respectively; />k pp And k pi Proportional and integral coefficients, ω, respectively, of the phase-locked loop 1 Is fundamental frequency angular frequency, ζ is damping ratio, ω n Is the natural oscillation angular frequency; s is the differential operator and j is the imaginary unit.
The invention has the following effects:
fig. 3 shows simulated waveforms before and after the active damping control strategy provided by the invention when the positive sequence voltage of the power grid drops to 52% and 62% respectively and the unbalance coefficient of the voltage is 61% and 45%. Wherein the short-circuit ratio of the power grid is 2.3, the two-phase short-circuit ground fault occurs in the power grid at the moment of 1.5s, the positive sequence voltage of the power grid drops to 52% of rated voltage, the unbalanced voltage coefficient is 61%, and t 1 The grid-side converter of the (1.5 s-1.8 s) stage direct-driven wind power grid-connected system only adopts basic positive and negative sequence current loop control, and the voltage V of the public connection point of the power grid can be seen without adopting the active damping control provided by the invention PCC The positive and negative sequence currents of the power grid contain a large number of harmonic waves and have obvious oscillation; t is t 2 The active damping control provided by the invention is put into the (1.8 s-2.1 s) stage to output positive and negative sequence current and common connection point voltage V pcc Is significantly suppressed; t is t 3 In the (2.1 s-2.4 s) stage, the positive sequence voltage of the power grid rises to 62%, the voltage unbalance coefficient becomes 45%, and the active damping control strategy provided by the invention can clearly see that the active damping control strategy provided by the invention can very effectively inhibit the oscillation problem caused by the asymmetric short circuit fault of the power grid, and has good adaptability when the voltage shock and the voltage unbalance degree are changed。
Therefore, the active damping control strategy of the direct-drive wind power grid-connected system can remarkably improve the dynamic stability of the direct-drive wind power grid-connected system under the asymmetric fault of the power grid, and improves the safe and stable operation capacity of the power grid.
Finally, it should be noted that the above examples of the present invention are merely illustrative of the present invention and are not limiting of the embodiments of the present invention. While the invention has been described in detail with reference to the preferred embodiments, it will be apparent to one skilled in the art that various other changes and modifications can be made therein. Not all embodiments are exhaustive. Obvious changes and modifications which are extended by the technical proposal of the invention are still within the protection scope of the invention.
Claims (1)
1. An active damping control method of a direct-driven wind power grid-connected system under an asymmetric fault is used for improving dynamic stability of the direct-driven wind power grid-connected system during an asymmetric short-circuit fault of a power grid; the method is characterized in that: according to the method, the interaction between the positive and negative sequence current loops of the grid-side converter of the direct-driven wind power grid-connected system and the impedance of the power grid under the asymmetric fault of the power grid is considered, active damping is introduced through a high-pass filter and a virtual resistor to inhibit the positive and negative sequence harmonic current of the power grid, and the dynamic stability of the system is improved; the method comprises the following specific steps of;
a1 Grid-side converter of direct-driven wind power grid-connected system in asymmetric fault period of power grid adopts a positive-negative sequence current control loop, and positive-negative sequence control voltage V is calculated according to the following formula dq+ And V dq- ：
In the method, in the process of the invention,is synchronous rotation input to a power grid by a direct-driven wind power grid-connected system during asymmetric faultsPositive sequence current reference value in the rotating coordinate system, < >>Is a negative sequence current reference value under a synchronous rotation coordinate system input to a power grid by a direct-driven wind power grid-connected system during an asymmetric fault period, I dq+ And I dq- Inputting positive and negative sequence currents, k of three-phase currents subjected to coordinate transformation for the collected direct-drive wind power grid-connected system p1 And k i1 The proportional coefficient and the integral coefficient, K, of the current loop PI controller are respectively dq Is a coupling coefficient, s is a differential operator;
a2 Based on step A1), I) dq+ And I dq- The positive and negative sequence harmonic currents are obtained through a high-pass filter, and are respectively fed forward to positive and negative sequence control voltages of the grid-side converter after being amplified through a virtual resistor, so that output current harmonic waves of the direct-drive wind power grid-connected system are restrained, and positive and negative sequence control voltages V after feedforward compensation are carried out dq+_re And V dq-_re The following formula is satisfied:
wherein Z is v Is a virtual impedance that achieves active damping;
a3 Virtual impedance Z v The virtual resistor is composed of a virtual resistor and a high-pass filter, and is calculated according to the following formula:
Z v (s)＝R v ·H filter (s)
wherein R is v Is a virtual resistor; h filter (s) is a high pass filter transfer function, H filter (s)＝s/(s+2πf cut ) The method comprises the steps of carrying out a first treatment on the surface of the s is a differential operator, f cut Is the cut-off frequency of the high pass filter;
a4 Step A2) and step A3) combining the virtual impedance Z v After the direct-drive wind power grid-connected system is introduced, positive and negative sequence of a grid-side converter of the direct-drive wind power grid-connected system is remodeled into impedance Z vsc_re The following formula is satisfied:
active damping control of the direct-driven wind power grid-connected system during the asymmetric fault period can be realized, so that dynamic stability of the system during the asymmetric fault period is improved; v in vsc_re,pn The grid-connected point positive and negative sequence voltage of the direct-drive wind power grid-connected system is I vsc_re,pn Outputting positive and negative sequence currents for the direct-drive wind power grid-connected system; the remodeling impedance satisfies the following equation:
wherein each element of the remodelling impedance matrix is respectively as follows:
wherein,
N(s)＝H PLL (s)H PLL (s±j4πf 1 )；L a 、L b 、L c ABC three-phase line inductance respectively, alpha is operator alpha=e j2/3π ，I 1 、I 2 Respectively a positive sequence fundamental frequency current component and a negative sequence fundamental frequency current component of the power grid, I' 1 、I′ 2 Respectively positive sequence fundamental frequency current conjugation and negative sequence fundamental frequency current conjugation, V 1 、V 2 Respectively a positive sequence fundamental frequency voltage component and a negative sequence fundamental frequency voltage component of a grid connection point, V' 1 And V' 2 Respectively positive sequence fundamental frequency voltage conjugation and negative sequence fundamental frequency voltage conjugation, f 1 For the fundamental frequency of the network, < >>And->The primary phase angles of positive and negative sequence fundamental frequency currents of the power grid are respectively; h i (s)＝k p1 +k i1 /s，k p1 And k i1 The proportional coefficient and the integral coefficient of the current loop PI controller are respectively; />k pp And k pi Proportional and integral coefficients, ω, respectively, of the phase-locked loop 1 Is fundamental frequency angular frequency, ζ is damping ratio, ω n Is the natural oscillation angular frequency; s is the differential operator and j is the imaginary unit.
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