CN112217236A - Virtual impedance control method for double-fed wind power grid-connected system under asymmetric fault - Google Patents
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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
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a virtual impedance control method of a double-fed wind power grid-connected system under an asymmetric fault, which is characterized in that the damping level of the system is increased by introducing virtual impedance, which is equivalent to reducing the electrical distance between the double-fed wind power grid-connected system and a fault point and increasing the short-circuit ratio, so that the interaction between high line impedance and a phase-locked loop of the double-fed wind power grid-connected system during the asymmetric short-circuit fault of a power grid is weakened, and the small signal stability of the double-fed wind power grid-connected system during the asymmetric fault is improved. According to the invention, on the basis of not increasing equipment hardware and not changing parameters of an internal controller, the small signal stability of the doubly-fed wind power grid-connected system during the asymmetric fault can be obviously improved by introducing a control strategy based on the virtual impedance.
Description
Technical Field
The invention relates to a virtual impedance control method for a double-fed wind power grid-connected system, which is suitable for the double-fed wind power grid-connected system under the asymmetric short-circuit fault of an alternating current power grid.
Background
With the rapid development of renewable energy sources, the installed capacity of wind power is also increasing continuously, but wind power and load are often in a reverse distribution characteristic, and a large wind farm is usually located in a remote area and has weak grid-connected strength. When the weak grid has an asymmetric fault, under the influence of high impedance of a power transmission line, under a typical low voltage ride through control strategy of a wind turbine generator, a double-fed wind power grid-connected system may have small signal instability, and the safe and stable operation capability of the system is seriously influenced. Therefore, the key problem of the current wind power development is to improve the small signal stability of the doubly-fed wind power grid-connected system during the asymmetric fault of the power grid. At present, relevant research performed by scholars at home and abroad mainly aims at analyzing the stability of small interference under a symmetric fault, such as the published following documents:
[1] liu Ju, Yao Wei, Wen Jing Yu, double-fed fan small interference stability analysis and control considering the influence of PLL and access power grid strength [ J ] China Motor engineering reports, 2017,37(11): 3162-.
[2]H.Nian,and B.Pang,“Stability and Power Quality Enhancement Strategy for DFIG System Connected to Harmonic Grid with Parallel Compensation,”IEEE Trans.Energy Conversion,vol.34,no.2,pp.1010-1022,Jun.2019.
The document [1] analyzes that the phase-locked loop oscillation is the main reason causing the small signal instability of the wind power system incorporated into the weak grid from the perspective of the dynamic characteristic of the phase-locked loop by using a characteristic value analysis method. The wind turbine generator damping controller based on the phase compensation principle effectively improves the damping level of a phase-locked loop oscillation mode by improving the phase of the phase-locked loop in an oscillation frequency section of the phase-locked loop, so that the oscillation phenomenon is suppressed. Document [2] analyzes the cause of small-signal instability of the doubly-fed wind power from the perspective of electrical resonance by using an impedance method, and provides a doubly-fed wind power grid-connected system control strategy based on impedance remodeling. None of the above documents address the problem of small signals generated during an asymmetric fault due to the interaction of the controller with high line impedance, and therefore the phase compensated damping controller and impedance reshaping control strategy proposed by the above documents has a limitation in solving the problem of small signal instability during an asymmetric fault.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a virtual impedance control method of a double-fed wind power grid-connected system under an asymmetric fault, and the method can obviously improve the small signal stability margin of the double-fed wind power grid-connected system during the asymmetric fault.
The technical scheme of the invention is realized as follows:
a virtual impedance control method of a double-fed wind power grid-connected system under an asymmetric fault is characterized in that a system damping level is increased by introducing virtual impedance, which is equivalent to reducing the electrical distance between the double-fed wind power grid-connected system and a fault point and increasing a short-circuit ratio, so that the interaction between high line impedance and a phase-locked loop of the double-fed wind power grid-connected system during the asymmetric short-circuit fault of a power grid is weakened, and the small signal stability of the double-fed wind power grid-connected system during the asymmetric fault is improved.
The specific control steps are as follows;
A1) electric powerDuring the asymmetric short circuit fault of the grid, the double-fed wind power grid-connected system adopts a positive sequence phase-locked loop and a negative sequence phase-locked loop to acquire positive sequence components and negative sequence components of the voltage of the grid-connected point, and after virtual impedance is introduced, the positive sequence components and the negative sequence components U of the input voltage of the positive sequence phase-locked loop and the negative sequence phase-locked loop of the double-fed wind power grid-connected system are calculated accordingPv、UNv:
In the formula of UP、UNThe positive and negative sequence components of the grid-connected point voltage; i isPg、INgThe positive sequence component and the negative sequence component of the current output to the power grid by the double-fed wind power grid-connected system during the asymmetric fault period; zPv、ZNvAre virtual impedance positive and negative sequence components;
A2) calculating the positive and negative sequence components Z of the virtual impedance of the doubly-fed wind power grid-connected system according to the following formulaPv、ZNv:
Wherein R isPv=RNv=RL,RLThe line resistance value from the grid-connected point to the fault point; s is a laplace operator;ω0is the resonant frequency, LLThe line inductance value from the grid-connected point to the fault point;
A3) on the basis of the step A1) and the step A2), when the power grid has the asymmetric short-circuit fault, the U is connectedPv、UNvInputting the virtual impedance Z into a phase-locked loop of a doubly-fed wind power grid-connected systemPv、ZNvDouble-fed wind power grid-connected system is introduced, and positive and negative sequence remodeling impedance Z of double-fed wind power grid-connected systemDFIG_PNvThe following formula is satisfied:
the virtual impedance control of the doubly-fed wind power grid-connected system during the asymmetric fault is realized, so that the small interference stability of the system during the asymmetric fault is improved; the remodelling impedance satisfies the following equation:
wherein, each element of the remolding impedance matrix is respectively:
NP(s)=GNPLL(s)GNPLL(s±j4πf1);NN(s)=GPPLL(s)GPPLL(s±j4πf1);GPPLL、GNPLLRespectively the transfer functions between the positive and negative sequence phase-locked loop voltage and the output angle; i is1、I2Respectively are positive sequence fundamental frequency components and negative sequence fundamental frequency components of the output current of the doubly-fed wind power system; i1L is the corresponding fundamental frequency positive sequence current amplitude; i is* 1、I* 2Is I1、I2The conjugate component of (a); hi(s) is the transfer function of the current loop controller; f. of1=50Hz;Is the angle between the positive sequence fundamental frequency voltage and the fundamental frequency current; u shape1、U2Respectively corresponding positive and negative sequence components of the fundamental frequency voltage; i U1|、|U2L is respectively the corresponding fundamental frequency positive and negative sequence voltage amplitudes; u shape* 1、U* 2Is U1、U2The conjugate component of (a); u shapeP、UNRespectively positive and negative sequence components of the grid-connected point voltage; i isP、INIs the current positive and negative sequence harmonic components; l isa、Lb、LcThe filter inductor is a filter inductor of the network side converter; kdqIs a cross decoupling coefficient; a ═ ej2/3π(ii) a j is the imaginary unit.
Compared with the prior art, the invention has the following beneficial effects:
on the basis of not increasing equipment hardware and not changing parameters of an internal controller, the method is equivalent to reducing the electrical distance between the wind power system and a fault point, increasing the short-circuit ratio, equivalently enhancing the power grid strength, weakening the interaction of high line impedance and a phase-locked loop of the double-fed wind power grid-connected system during the asymmetric short-circuit fault of the power grid and remarkably improving the small-signal stability of the double-fed wind power grid-connected system during the asymmetric fault by introducing a control strategy based on virtual impedance.
Drawings
Fig. 1 is a schematic structural diagram of a doubly-fed wind power grid-connected system after impedance is reshaped.
FIG. 2 is a diagram of a decoupled double-synchronous positive and negative sequence phase-locked loop topology.
Fig. 3 is a simulation waveform diagram of a double-phase short circuit ground fault occurring in the power grid, the voltage of the power grid drops to 0.2pu, and the double-fed wind power grid-connected system respectively adopts a traditional control method and an impedance remodeling control method.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a 2MW doubly-fed wind power grid-connected system after impedance is reshaped. FIG. 2 is a diagram of a decoupled double-synchronous positive and negative sequence phase-locked loop topology.
According to the invention, the system damping level is increased by introducing the virtual impedance, which is equivalent to reducing the electrical distance between the double-fed wind power grid-connected system and a fault point, and increasing the short-circuit ratio, so that the interaction between the high line impedance of the double-fed wind power grid-connected system and a phase-locked loop during the asymmetric short-circuit fault of a power grid is weakened, and the small-signal stability of the double-fed wind power grid-connected system during the asymmetric fault is improved.
The specific implementation steps are as follows:
A1) during the asymmetric short circuit fault of the power grid, the double-fed wind power grid-connected system adopts a positive sequence phase-locked loop and a negative sequence phase-locked loop to acquire positive sequence components and negative sequence components of the voltage of a grid-connected point, and after virtual impedance is introduced, the positive sequence components and the negative sequence components U of the input voltage of the positive sequence phase-locked loop and the negative sequence phase-locked loop of the double-fed wind power grid-connected system are calculatedPv、UNv:
In the formula of UP、UNThe positive and negative sequence components of the grid-connected point voltage; i isPg、INgThe positive sequence component and the negative sequence component of the current output to the power grid by the double-fed wind power grid-connected system during the asymmetric fault period; zPv、ZNvAre virtual impedance positive and negative sequence components;
A2) push buttonVirtual impedance positive and negative sequence components Z of doubly-fed wind power grid-connected system are calculated through following formulaPv、ZNv:
Wherein R isPv=RNv=RL,RLThe line resistance value from the grid-connected point to the fault point; s is a laplace operator;ω0is the resonant frequency, LLThe line inductance value from the grid-connected point to the fault point;
A3) on the basis of the step A1) and the step A2), when the power grid has the asymmetric short-circuit fault, the U is connectedPv、UNvInputting the virtual impedance Z into a phase-locked loop of a doubly-fed wind power grid-connected systemPv、ZNvDouble-fed wind power grid-connected system is introduced, and positive and negative sequence remodeling impedance Z of double-fed wind power grid-connected systemDFIG_PNvThe following formula is satisfied:
the virtual impedance control of the double-fed wind power grid-connected system during the asymmetric fault can be realized, so that the small interference stability of the system during the asymmetric fault is improved. The remodelling impedance satisfies the following equation:
wherein, each element of the remolding impedance matrix is respectively:
NP(s)=GNPLL(s)GNPLL(s±j4πf1);NN(s)=GPPLL(s)GPPLL(s±j4πf1);GPPLL、GNPLLRespectively the transfer functions between the positive and negative sequence phase-locked loop voltage and the output angle; i is1、I2Respectively are positive sequence fundamental frequency components and negative sequence fundamental frequency components of the output current of the doubly-fed wind power system; i1L is the corresponding fundamental frequency positive sequence current amplitude; i is* 1、I* 2Is I1、I2The conjugate component of (a); hi(s) is the transfer function of the current loop controller; f. of1=50Hz;Is the angle between the positive sequence fundamental frequency voltage and the fundamental frequency current; u shape1、U2Respectively corresponding positive and negative sequence components of the fundamental frequency voltage; i U1|、|U2L is respectively the corresponding fundamental frequency positive and negative sequence voltage amplitudes; u shape* 1、U* 2Is U1、U2The conjugate component of (a); u shapeP、UNRespectively positive and negative sequence components of the grid-connected point voltage; i isP、INIs the current positive and negative sequence harmonic components; l isa、Lb、LcThe filter inductor is a filter inductor of the network side converter; kdqIs a cross decoupling coefficient; a ═ ej2/3π(ii) a j is the imaginary unit.
Description of the effects of the invention:
fig. 3 shows a simulation waveform diagram of A, B two-phase voltage dropping to 0.2pu, using the conventional control strategy and the virtual impedance control strategy proposed by the present invention, respectively. Wherein, two-phase asymmetric short circuit fault occurs in the power grid at the moment of 1s, 1 s-2 s are the fault duration, and U isabcIs a grid-connected point three-phase voltage. It can be known from fig. three (a) that when the doubly-fed wind power system adopts the conventional low-voltage control strategy, it can be seen that the system has a small-interference instability phenomenon at this time, the oscillation amplitudes of the positive and negative sequence components of the voltage and current of the grid-connected point are continuously increased, and meanwhile, it can be seen from the result of Fast Fourier Transform (FFT) analysis that the system has a frequency coupling phenomenon, the Harmonic Distortion rate (THD) of the voltage of the grid-connected point reaches 11.21%, and the voltage waveform Distortion is serious. As can be seen from the third (b) of the figure, after the virtual impedance control strategy provided by the invention is adopted by the doubly-fed wind power system, the small-interference stability of the doubly-fed system is remarkably improved, the oscillation amplitude of the system is remarkably reduced, corresponding harmonic components in the voltage are all suppressed, and the THD is only 2.31%.
Therefore, the virtual impedance control method of the double-fed wind power grid-connected system can improve the low-voltage ride through capability of the double-fed wind power system during the asymmetric fault period and enhance the safe and stable operation capability of a power grid. Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it will be apparent to those skilled in the art that other variations and modifications can be made based on the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (2)
1. A virtual impedance control method of a double-fed wind power grid-connected system under an asymmetric fault is characterized by comprising the following steps: the damping level of the system is increased by introducing the virtual impedance, which is equivalent to reducing the electrical distance between a double-fed wind power grid-connected system and a fault point, and increasing the short-circuit ratio, so that the interaction between the high line impedance of the double-fed wind power grid-connected system and a phase-locked loop during the asymmetric short-circuit fault of a power grid is weakened, and the small-signal stability of the double-fed wind power grid-connected system during the asymmetric fault is improved.
2. The method for controlling the virtual impedance of the doubly-fed wind power grid-connected system under the asymmetric fault according to claim 1, is characterized in that: the specific control steps are as follows;
A1) during the asymmetric short circuit fault of the power grid, the double-fed wind power grid-connected system adopts a positive sequence phase-locked loop and a negative sequence phase-locked loop to acquire positive sequence components and negative sequence components of the voltage of a grid-connected point, and after virtual impedance is introduced, the positive sequence components and the negative sequence components U of the input voltage of the positive sequence phase-locked loop and the negative sequence phase-locked loop of the double-fed wind power grid-connected system are calculatedPv、UNv:
In the formula of UP、UNThe positive and negative sequence components of the grid-connected point voltage; i isPg、INgThe positive sequence component and the negative sequence component of the current output to the power grid by the double-fed wind power grid-connected system during the asymmetric fault period; zPv、ZNvAre virtual impedance positive and negative sequence components;
A2) calculating virtual resistance of doubly-fed wind power grid-connected system according to formulaResistance to positive and negative sequence components ZPv、ZNv:
Wherein R isPv=RNv=RL,RLThe line resistance value from the grid-connected point to the fault point; s is a laplace operator;ω0is the resonant frequency, LLThe line inductance value from the grid-connected point to the fault point;
A3) on the basis of the step A1) and the step A2), when the power grid has the asymmetric short-circuit fault, the U is connectedPv、UNvInputting the virtual impedance Z into a phase-locked loop of a doubly-fed wind power grid-connected systemPv、ZNvDouble-fed wind power grid-connected system is introduced, and positive and negative sequence remodeling impedance Z of double-fed wind power grid-connected systemDFIG_PNvThe following formula is satisfied:
the virtual impedance control of the doubly-fed wind power grid-connected system during the asymmetric fault is realized, so that the small interference stability of the system during the asymmetric fault is improved; the remodelling impedance satisfies the following equation:
wherein, each element of the remolding impedance matrix is respectively:
NN(s)=GPPLL(s)GPPLL(s±j4πf1);GPPLL、GNPLLRespectively the transfer functions between the positive and negative sequence phase-locked loop voltage and the output angle; i is1、I2Respectively are positive sequence fundamental frequency components and negative sequence fundamental frequency components of the output current of the doubly-fed wind power system; i1L is the corresponding fundamental frequency positive sequence current amplitude; i is* 1、I* 2Is I1、I2The conjugate component of (a); hi(s) is the transfer function of the current loop controller; f. of1=50Hz;Is a positive sequence fundamental frequencyThe angle between the voltage and the fundamental current; u shape1、U2Respectively corresponding positive and negative sequence components of the fundamental frequency voltage; i U1|、|U2L is respectively the corresponding fundamental frequency positive and negative sequence voltage amplitudes; u shape* 1、U* 2Is U1、U2The conjugate component of (a); u shapeP、UNRespectively positive and negative sequence components of the grid-connected point voltage; i isP、INIs the current positive and negative sequence harmonic components; l isa、Lb、LcThe filter inductor is a filter inductor of the network side converter; kdqIs a cross decoupling coefficient; a ═ ej2/3π(ii) a j is the imaginary unit.
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CN115207912A (en) * | 2022-07-27 | 2022-10-18 | 重庆大学 | Small signal stability enhancement control strategy for grid-connected converter under weak grid asymmetric voltage drop fault |
CN115395569A (en) * | 2022-09-16 | 2022-11-25 | 山东大学 | Method and system for controlling asymmetric fault of double-fed fan based on equivalent negative sequence reactance |
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CN112671042A (en) * | 2021-01-14 | 2021-04-16 | 上海交通大学 | Virtual impedance access method and device based on short-circuit ratio and electronic equipment |
CN112671042B (en) * | 2021-01-14 | 2023-01-24 | 上海交通大学 | Virtual impedance access method and device based on short-circuit ratio and electronic equipment |
CN113162120A (en) * | 2021-05-31 | 2021-07-23 | 重庆大学 | Wind power grid-connected system transient stability control method based on automatic virtual resistance compensation |
CN113162120B (en) * | 2021-05-31 | 2022-11-01 | 重庆大学 | Wind power grid-connected system transient stability control method based on automatic virtual resistance compensation |
CN116191523A (en) * | 2021-11-26 | 2023-05-30 | 南京南瑞继保电气有限公司 | Control method and control system for converter adapting to power grid |
CN115173409A (en) * | 2022-07-27 | 2022-10-11 | 重庆大学 | Asymmetric low-voltage ride-through control strategy of double-fed wind generating set based on improved phase-locked loop |
CN115207912A (en) * | 2022-07-27 | 2022-10-18 | 重庆大学 | Small signal stability enhancement control strategy for grid-connected converter under weak grid asymmetric voltage drop fault |
CN115173409B (en) * | 2022-07-27 | 2024-03-26 | 重庆大学 | Asymmetric low-voltage ride-through control strategy of doubly-fed wind generator set based on improved phase-locked loop |
CN115207912B (en) * | 2022-07-27 | 2024-03-29 | 重庆大学 | Small signal stability enhancement control strategy for grid-connected converter under asymmetric voltage drop fault of weak power grid |
CN115395569A (en) * | 2022-09-16 | 2022-11-25 | 山东大学 | Method and system for controlling asymmetric fault of double-fed fan based on equivalent negative sequence reactance |
CN115954928A (en) * | 2022-09-23 | 2023-04-11 | 盛东如东海上风力发电有限责任公司 | Stability analysis method and system of phase-locked grid-connected converter |
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