CN110556865B - Method, device and medium for correcting low voltage ride through characteristic model parameters of wind turbine generator - Google Patents

Method, device and medium for correcting low voltage ride through characteristic model parameters of wind turbine generator Download PDF

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CN110556865B
CN110556865B CN201910886635.9A CN201910886635A CN110556865B CN 110556865 B CN110556865 B CN 110556865B CN 201910886635 A CN201910886635 A CN 201910886635A CN 110556865 B CN110556865 B CN 110556865B
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control parameter
wind turbine
reactive power
turbine generator
active
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CN110556865A (en
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陈刚
蔡东阳
洪潮
赵利刚
江出阳
刘蔚
陈雁
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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Abstract

The invention relates to the technical field of wind turbine generators, and discloses a method, a device and a storage medium for correcting low voltage ride through characteristic model parameters of a wind turbine generator, wherein the method comprises the following steps: determining a first control parameter of the wind turbine generator set after a voltage drop fault occurs and a first control mode of the first control parameter; establishing an initial model of the low voltage ride through characteristic of the wind turbine generator according to the first control parameter and the first control mode; acquiring working parameters of the wind turbine generator during a voltage drop fault, and determining corresponding second control parameters and a second control mode for the second control parameters according to the working parameters; correcting the first control parameter and the first control mode according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator; and carrying out simulation verification on the final model so as to monitor the electromechanical transient process of the power system by applying the verified final model, thereby improving the electromechanical transient simulation precision of the power system and ensuring the safe and stable operation of the power grid.

Description

Method, device and medium for correcting low voltage ride through characteristic model parameters of wind turbine generator
Technical Field
The invention relates to the technical field of wind turbines, in particular to a method and a device for correcting low voltage ride through characteristic model parameters of a wind turbine and a computer readable storage medium.
Background
The direct-drive wind turbine generator is an energy conversion device for converting wind energy into electric energy, adopts a driving mode of directly connecting a multi-pole motor and an impeller, removes a traditional part of a gear box, and has the advantages of high efficiency, low noise, long service life, simple structure, easy maintenance and the like, thereby receiving wide attention.
At present, the direct-drive wind turbine generator occupies more than half of the capacity of the grid-connected wind turbine generator, and as a large number of direct-drive wind turbine generators are connected to a power grid, the transient stability and the voltage stability of a power system can be directly influenced by the low-voltage ride-through characteristic of the direct-drive wind turbine generators, so that the low-voltage ride-through characteristic of the direct-drive wind turbine generators is extremely important for maintaining the stability of the power grid. However, in the existing electromechanical transient simulation of the power system, low voltage ride through characteristic model parameters of the direct-drive wind turbine generator set which are consistent with the actual condition are lacked, so that the accuracy of the electromechanical transient simulation of the power system is low, and the safe and stable operation of a power grid cannot be ensured.
Disclosure of Invention
The invention aims to provide a method and a device for correcting low voltage ride through characteristic model parameters of a wind turbine generator and a computer readable storage medium, which can effectively correct the low voltage ride through characteristic model parameters of the wind turbine generator so as to improve the accuracy of electromechanical transient simulation of a power system and ensure the safe and stable operation of a power grid.
In order to solve the technical problem, the invention provides a method for correcting a low voltage ride through characteristic model parameter of a wind turbine generator, which comprises the following steps:
determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter; wherein the voltage sag faults include symmetric faults and asymmetric faults; the first control parameters comprise a first active control parameter of the wind turbine generator during a symmetric fault, a first passive control parameter of the wind turbine generator during the symmetric fault, a second active control parameter of the wind turbine generator during an asymmetric fault and a second reactive control parameter of the wind turbine generator during the asymmetric fault;
establishing an initial model of the low voltage ride through characteristic of the wind turbine generator according to the first control parameter and the first control mode;
acquiring working parameters of the wind turbine generator during the voltage drop fault, and determining corresponding second control parameters and a second control mode of the second control parameters according to the working parameters; the second control parameters comprise a third active control parameter of the wind turbine during a symmetric fault, a third reactive control parameter of the wind turbine during a symmetric fault, a fourth active control parameter of the wind turbine during an asymmetric fault and a fourth reactive control parameter of the wind turbine during an asymmetric fault;
correcting the first control parameter and the first control mode in the initial model according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator;
performing simulation verification on the final model to monitor an electromechanical transient process of the power system by applying the final model passing the simulation verification;
the method for determining the first control parameter of the wind turbine generator after the voltage drop fault and the first control mode of the first control parameter specifically comprises the following steps:
determining a first active control parameter of the wind turbine generator and a first active control mode of the first active control parameter during the symmetric fault, and determining a second active control mode of the first active control parameter after the symmetric fault of the wind turbine generator is eliminated; wherein the first active control parameter is a first active current or a first active power;
determining a first reactive power control mode of the wind turbine generator and a first reactive power control parameter of the wind turbine generator during the symmetric fault, and determining a second reactive power control mode of the wind turbine generator for the first reactive power control parameter after the symmetric fault is eliminated; wherein, the first reactive control parameter is a first reactive current or a first reactive power;
determining a second active control parameter of the wind turbine generator and a third active control mode of the second active control parameter during the asymmetric fault period, and determining a fourth active control mode of the wind turbine generator on the second active control parameter after the asymmetric fault is eliminated; wherein the second active control parameter is a second active current or a second active power;
determining a second reactive power control parameter of the wind turbine generator during the asymmetric fault and a third reactive power control mode of the second reactive power control parameter, and determining a fourth reactive power control mode of the wind turbine generator for the second reactive power control parameter after the asymmetric fault is eliminated; wherein the second reactive control parameter is a second reactive current or a second reactive power;
when the operating parameters include voltage, active power, and reactive power of the wind turbine during the voltage sag fault;
the determining a corresponding second control parameter and a second control mode for the second control parameter according to the working parameter specifically includes:
according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, determining a third active control parameter of the wind turbine generator during the symmetric fault and a fifth active control mode of the third active control parameter, and determining a sixth active control mode of the wind turbine generator on the third active control parameter after the symmetric fault is eliminated; wherein the third active control parameter comprises a third active current or a third active power;
according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, determining a third reactive power control parameter of the wind turbine generator during the symmetric fault and a fifth reactive power control mode of the third reactive power control parameter, and determining a sixth reactive power control mode of the wind turbine generator on the third reactive power control parameter after the symmetric fault is eliminated; wherein the third reactive control parameter comprises a third reactive current or a third reactive power;
determining a fourth active control parameter and a seventh active control mode of the fourth active control parameter of the wind turbine generator during the asymmetric fault according to the voltage, the active power and the reactive power of the wind turbine generator during the asymmetric fault, and determining an eighth active control mode of the fourth active control parameter of the wind turbine generator after the asymmetric fault is eliminated; wherein the fourth active control parameter comprises a fourth active current or a fourth active power;
according to the voltage, the active power and the reactive power of the wind turbine generator in the asymmetric fault, determining a fourth reactive power control parameter of the wind turbine generator in the asymmetric fault period and a seventh reactive power control mode of the fourth reactive power control parameter, and determining an eighth reactive power control mode of the wind turbine generator on the fourth reactive power control parameter after the asymmetric fault is eliminated; wherein the fourth reactive control parameter comprises a fourth reactive current or a fourth reactive power.
Preferably, the first active control mode is as follows: controlling the first active control parameter to be a preset first numerical value;
the second active control mode is as follows: controlling the first active control parameter to immediately recover to a first active control parameter initial value, controlling the first active control parameter to rise to the first active control parameter initial value with a preset first slope, or controlling the first active control parameter to rise to the first active control parameter initial value with a preset first parabola; the initial value of the first active control parameter is the value of the first active control parameter before the symmetric fault occurs in the wind turbine generator set;
the first reactive power control mode is as follows: controlling the first reactive control parameter according to a first drop voltage, controlling the first reactive control parameter according to a preset first curve or controlling the first reactive control parameter to be a preset second numerical value; wherein the first droop voltage is a voltage of the wind turbine generator during the symmetric fault;
the second reactive power control mode is as follows: controlling the first reactive control parameter to immediately recover to a first reactive control parameter initial value, keeping the first reactive control parameter unchanged within a preset first time, controlling the first reactive control parameter to descend according to a preset first exponential curve or controlling the first reactive control parameter to descend according to a preset second slope; the initial value of the first reactive control parameter is a value of the first reactive control parameter before the symmetric fault occurs in the wind turbine generator.
Preferably, the third active control mode is as follows: controlling the second active control parameter to be a preset third numerical value or controlling the second active control parameter according to the positive sequence voltage of the wind turbine generator;
the fourth active control mode is as follows: controlling the second active control parameter to immediately recover to a second active control parameter initial value, controlling the second active control parameter to rise to the second active control parameter initial value with a preset third slope, or controlling the second active control parameter to rise to the second active control parameter initial value with a preset second parabola; the initial value of the second active control parameter is the value of the second active control parameter before the asymmetric fault occurs in the wind turbine generator;
the third reactive power control mode is as follows: controlling the second reactive power control parameter to be zero, controlling the second reactive power control parameter to be a preset fourth numerical value, controlling the second reactive power control parameter according to a second drop voltage, controlling the second reactive power control parameter according to a preset second curve, controlling the second reactive power control parameter according to a negative sequence voltage of the wind turbine generator or controlling the second reactive power control parameter according to a positive sequence voltage and a negative sequence voltage of the wind turbine generator; wherein the second droop voltage is a voltage of the wind turbine generator during the asymmetric fault;
the fourth reactive power control mode is as follows: controlling the second reactive power control parameter to immediately recover to a second reactive power control parameter initial value, keeping the second reactive power control parameter unchanged within a preset second time, controlling the second reactive power control parameter to descend according to a preset second index curve or controlling the second reactive power control parameter to descend according to a preset fourth slope; and the initial value of the second reactive power control parameter is the value of the second reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
Preferably, the fifth active control mode is as follows: controlling the third active control parameter to be a preset fifth numerical value;
the sixth active control mode is as follows: controlling the third active control parameter to immediately recover to a third active control parameter initial value, controlling the third active control parameter to rise to the third active control parameter initial value with a preset fifth slope, or controlling the third active control parameter to rise to the third active control parameter initial value with a preset third parabola; the initial value of the third active control parameter is the value of the third active control parameter before the symmetric fault occurs in the wind turbine generator set;
the fifth reactive power control mode is as follows: controlling the third reactive power control parameter according to the minimum voltage value in the positive sequence voltage and the phase voltage of the wind turbine generator, controlling the third reactive power control parameter according to a preset first relation curve or controlling the third reactive power control parameter to be a preset sixth numerical value; the preset first relation curve is a relation curve of the voltage of the wind turbine generator and the third reactive power control parameter;
the sixth reactive power control mode is as follows: controlling the third reactive power control parameter to immediately recover to a third reactive power control parameter initial value, keeping the third reactive power control parameter unchanged within a preset third time, controlling the third reactive power control parameter to descend according to a preset third exponential curve or controlling the third reactive power control parameter to descend according to a preset sixth slope; and the initial value of the third reactive power control parameter is the value of the third reactive power control parameter before the symmetric fault occurs in the wind turbine generator.
Preferably, the seventh active control mode is: controlling the fourth active control parameter to be a preset seventh numerical value or controlling the fourth active control parameter according to the positive sequence voltage of the wind turbine generator;
the eighth active control mode is as follows: controlling the fourth active control parameter to immediately recover to a fourth active control parameter initial value, controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset seventh slope, or controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset fourth parabola; the initial value of the fourth active control parameter is a value of the fourth active control parameter before the asymmetric fault occurs in the wind turbine generator;
the seventh reactive power control mode is as follows: controlling the fourth reactive power control parameter to be zero, controlling the fourth reactive power control parameter to be a preset eighth numerical value, controlling the fourth reactive power control parameter according to a minimum voltage value in a positive sequence voltage and a phase voltage of the wind turbine generator, controlling the fourth reactive power control parameter according to a preset second relation curve or controlling the fourth reactive power control parameter according to a negative sequence voltage of the wind turbine generator; the preset second relation curve is a relation curve of the voltage of the wind turbine generator and the four reactive power control parameters;
the eighth reactive power control mode is as follows: controlling the fourth reactive power control parameter to immediately recover to a fourth reactive power control parameter initial value, keeping the fourth reactive power control parameter unchanged within a preset fourth time, controlling the fourth reactive power control parameter to descend by a preset fifth parabola or controlling the fourth reactive power control parameter to descend by a preset eighth slope; the initial value of the fourth reactive power control parameter is the value of the third reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
As a preferred scheme, the performing simulation verification on the final model specifically includes:
simulating the working parameters based on the final model to obtain an active power simulation value and a reactive power simulation value;
comparing the active power simulation value and the reactive power simulation value with a preset active power standard value and a preset reactive power standard value respectively;
and when the difference value between the active power simulation value and the active power standard value is smaller than a preset first difference value threshold value, and the difference value between the reactive power simulation value and the reactive power standard value is smaller than a preset second difference value threshold value, determining that the simulation verification is passed.
In order to solve the same technical problem, an embodiment of the present invention further provides a device for correcting a low voltage ride through characteristic model parameter of a wind turbine generator, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the method for correcting the low voltage ride through characteristic model parameter of the wind turbine generator when executing the computer program.
In order to solve the same technical problem, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for correcting the low voltage ride through characteristic model parameter of the wind turbine generator.
Compared with the prior art, the invention provides a method, a device and a computer readable storage medium for correcting low voltage ride through characteristic model parameters of a wind turbine generator, wherein an initial model of the low voltage ride through characteristic of the wind turbine generator is established by determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter, then a corresponding second control parameter and a second control mode of the second control parameter are determined according to working parameters of the wind turbine generator during the voltage drop fault, the initial model parameters are corrected according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator, and finally the final model is subjected to simulation verification, so that the low voltage ride through characteristic model parameters of the wind turbine generator are effectively corrected, the corrected final model can be applied to monitor the electromechanical transient process of the power system, and the electromechanical transient simulation precision of the power system is improved, so that the safe and stable operation of a power grid is ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for correcting a low voltage ride through characteristic model parameter of a wind turbine generator in an embodiment of the invention;
fig. 2 is a detailed flowchart of step S11 in fig. 1;
fig. 3 is a detailed flowchart of step S13 in fig. 1;
FIG. 4 is an active power simulation curve and an active power standard curve in an embodiment of the present invention;
FIG. 5 is a reactive power simulation curve and a reactive power standard curve in an embodiment of the present invention;
fig. 6 is a device for correcting the low voltage ride through characteristic model parameter of the wind turbine generator in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a method for correcting a low voltage ride through characteristic model parameter of a wind turbine generator according to an embodiment of the present invention is shown;
the method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator provided by the embodiment comprises the following steps of S11-S15:
s11, determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter; wherein the voltage sag faults include symmetric faults and asymmetric faults; the first control parameters comprise a first active control parameter of the wind turbine generator during a symmetric fault, a first passive control parameter of the wind turbine generator during the symmetric fault, a second active control parameter of the wind turbine generator during an asymmetric fault and a second reactive control parameter of the wind turbine generator during the asymmetric fault;
in specific implementation, according to a preset wind turbine generator low voltage ride through control design strategy, selecting a first control parameter of the corresponding wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter; for example, the selection may be made according to a factory-provided low voltage ride through control design strategy.
S12, establishing an initial model of the low voltage ride through characteristic of the wind turbine generator according to the first control parameter and the first control mode;
it should be noted that an initial model of the low voltage ride through characteristic of the wind turbine generator can be established by using an existing method for establishing a model of the low voltage ride through characteristic of the wind turbine generator according to the first control parameter and the first control mode.
S13, obtaining working parameters of the wind turbine generator during the voltage drop fault, and determining corresponding second control parameters and a second control mode of the second control parameters according to the working parameters; the second control parameters comprise a third active control parameter of the wind turbine during a symmetric fault, a third reactive control parameter of the wind turbine during a symmetric fault, a fourth active control parameter of the wind turbine during an asymmetric fault and a fourth reactive control parameter of the wind turbine during an asymmetric fault;
s14, correcting the first control parameter and the first control mode in the initial model according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator;
in specific implementation, the first control parameter and the first control mode are correspondingly corrected according to the second control parameter and the second control mode, so that the corrected first control parameter corresponds to the second control parameter, and the corrected first control mode corresponds to the second control mode, so that a final model of the low-voltage ride-through characteristic of the wind turbine generator is obtained.
And S15, performing simulation verification on the final model so as to monitor the electromechanical transient process of the power system by applying the final model passing the simulation verification.
In specific implementation, the final model is subjected to simulation verification, so that the final model subjected to simulation verification is applied to monitor the electromechanical transient process of the power system, and therefore the running state of the power grid is monitored.
In the embodiment of the invention, an initial model of the low voltage ride through characteristic of the wind turbine generator is established by determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter, then a corresponding second control parameter and a second control mode of the second control parameter are determined according to working parameters of the wind turbine generator during the low voltage drop fault, the initial model parameter is corrected according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator, and finally the final model is subjected to simulation verification, so that the low voltage ride through characteristic model parameter of the wind turbine generator is effectively corrected, the electromechanical transient process of an electric power system can be applied, and the accuracy of the electromechanical transient simulation of the electric power system is improved, therefore, safe and stable operation of the power grid is guaranteed.
As shown in fig. 2, in a preferred embodiment, in step S11, the determining a first control parameter of the wind turbine generator after the voltage drop fault occurs and a first control manner of the first control parameter specifically include the following steps S111 to S114:
s111, determining a first active control parameter of the wind turbine generator during the symmetric fault and a first active control mode of the first active control parameter, and determining a second active control mode of the wind turbine generator for the first active control parameter after the symmetric fault is eliminated; wherein the first active control parameter is a first active current or a first active power;
s112, determining a first reactive power control parameter of the wind turbine generator during the symmetric fault and a first reactive power control mode of the first reactive power control parameter, and determining a second reactive power control mode of the wind turbine generator for the first reactive power control parameter after the symmetric fault is eliminated; wherein, the first reactive control parameter is a first reactive current or a first reactive power;
s113, determining a second active control parameter of the wind turbine generator and a third active control mode of the second active control parameter during the asymmetric fault period, and determining a fourth active control mode of the wind turbine generator on the second active control parameter after the asymmetric fault is eliminated; wherein the second active control parameter is a second active current or a second active power;
s114, determining a second reactive power control parameter of the wind turbine generator during the asymmetric fault and a third reactive power control mode of the second reactive power control parameter, and determining a fourth reactive power control mode of the wind turbine generator for the second reactive power control parameter after the asymmetric fault is eliminated; and the second reactive control parameter is a second reactive current or a second reactive power.
Specifically, in step S111, the first active control mode is: controlling the first active control parameter to be a preset first numerical value;
the second active control mode is as follows: controlling the first active control parameter to immediately recover to a first active control parameter initial value, controlling the first active control parameter to rise to the first active control parameter initial value with a preset first slope, or controlling the first active control parameter to rise to the first active control parameter initial value with a preset first parabola; the initial value of the first active control parameter is the value of the first active control parameter before the symmetric fault occurs in the wind turbine generator.
It should be noted that the first value may be set according to an actual use condition, for example, when the first active control parameter is the first active current, the first value may be a preset active current value or a preset active current percentage value; when the first active power control parameter is the first active power, the first value may be set to a preset active power value or a preset active power percentage value, which is not described herein again.
In step S112, the first reactive power control method is any one of the following three methods: controlling the first reactive control parameter according to a first drop voltage, controlling the first reactive control parameter according to a preset first curve or controlling the first reactive control parameter to be a preset second numerical value; wherein the first droop voltage is a voltage of the wind turbine generator during the symmetric fault;
the second reactive power control mode is any one of the following four modes: controlling the first reactive control parameter to immediately recover to a first reactive control parameter initial value, keeping the first reactive control parameter unchanged within a preset first time, controlling the first reactive control parameter to descend according to a preset first exponential curve or controlling the first reactive control parameter to descend according to a preset second slope; the initial value of the first reactive control parameter is a value of the first reactive control parameter before the symmetric fault occurs in the wind turbine generator.
It should be noted that, when the first reactive control parameter is a first reactive current, the controlling the first reactive control parameter according to the first droop voltage specifically includes: according to the first droop voltage, by the following formula: i isq1＝1.5*(0.9-U1) Controlling the first idle current, Iq1Is the first reactive current, U1Is the first droop voltage. When the first reactive control parameter is a first reactive current, controlling the first reactive control parameter according to a preset first curve, specifically: appointing a reactive current value according to the preset first curve and setting a reactive current value in the symmetrical fault period of the wind turbine generatorControlling the first reactive current to be a designated reactive current value; similarly, when the first rrc parameter is the first rrc power, the above method may be referred to, and is not described herein again.
In step S113, the third active control mode is: controlling the second active control parameter to be a preset third numerical value or controlling the second active control parameter according to the positive sequence voltage of the wind turbine generator;
the fourth active control mode is as follows: controlling the second active control parameter to immediately recover to a second active control parameter initial value, controlling the second active control parameter to rise to the second active control parameter initial value with a preset third slope, or controlling the second active control parameter to rise to the second active control parameter initial value with a preset second parabola; and the initial value of the second active control parameter is the value of the second active control parameter before the asymmetric fault occurs in the wind turbine generator.
In step S114, the third reactive power control method is any one of the following six methods: controlling the second reactive power control parameter to be zero, controlling the second reactive power control parameter to be a preset fourth numerical value, controlling the second reactive power control parameter according to a second drop voltage, controlling the second reactive power control parameter according to a preset second curve, controlling the second reactive power control parameter according to a negative sequence voltage of the wind turbine generator or controlling the second reactive power control parameter according to a positive sequence voltage and a negative sequence voltage of the wind turbine generator; wherein the second droop voltage is a voltage of the wind turbine generator during the asymmetric fault;
the fourth reactive power control mode is as follows: controlling the second reactive power control parameter to immediately recover to a second reactive power control parameter initial value, keeping the second reactive power control parameter unchanged within a preset second time, controlling the second reactive power control parameter to descend according to a preset second index curve or controlling the second reactive power control parameter to descend according to a preset fourth slope; and the initial value of the second reactive power control parameter is the value of the second reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
It should be noted that, in the specific implementation, reference may be made to step S112 above, and details are not repeated here, where the second reactive power control parameter is controlled according to the droop voltage, and the second reactive power control parameter is controlled according to the preset second curve. It should be noted that, when the second reactive power control parameter is a second reactive current, the controlling the second reactive power control parameter according to the second droop voltage specifically includes: according to the second dropping voltage, through the following formula: i isq2＝1.5*(0.9-U2) Controlling said second reactive current, Iq2For said second reactive current, U2Is the second droop voltage. When the second reactive power control parameter is a second reactive current, controlling the second reactive power control parameter according to a preset second curve, specifically: appointing a reactive current value according to the preset second curve, and controlling the second reactive current to be the appointed reactive current value during the asymmetric fault period of the wind turbine generator; similarly, when the second reactive power control parameter is the second reactive power, the above method may be referred to, and details are not repeated herein. In addition, when the second reactive power control parameter is the second reactive current, the second reactive power control parameter is controlled according to the negative sequence voltage of the wind turbine generator, specifically: according to the negative sequence voltage of the wind turbine generator set, the following formula I is adoptedq3＝kq*(0.9-U3) Controlling the second reactive current; wherein, Iq3The second reactive current is the first reactive current; k is a radical ofqIs a control coefficient; u shape3Is the negative sequence voltage.
In addition, the execution sequence between steps S111-S114 is not limited in the embodiment of the present invention; for example, step S114 may be performed first, and then steps S111-S113 may be performed, which is not described herein again.
In a preferred embodiment, as shown in fig. 3, in step S13, the operating parameters include voltage, active power and reactive power of the wind turbine during the voltage sag fault; specifically, the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault are included; and voltage, active power and reactive power of the wind turbine during the asymmetric fault;
therefore, when the voltage drop fault occurs in the wind turbine generator, the voltage, the active power and the reactive power of the wind turbine generator are obtained.
In step S13, the determining a corresponding second control parameter and a second control manner for the second control parameter according to the working parameter specifically includes the following steps S131 to S134:
s131, determining a third active control parameter of the wind turbine generator and a fifth active control mode of the third active control parameter according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, and determining a sixth active control mode of the third active control parameter after the symmetric fault of the wind turbine generator is eliminated; wherein the third active control parameter comprises a third active current or a third active power;
s132, determining a third reactive power control parameter of the wind turbine generator and a fifth reactive power control mode of the third reactive power control parameter according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, and determining a sixth reactive power control mode of the third reactive power control parameter after the symmetric fault of the wind turbine generator is eliminated; wherein the third reactive control parameter comprises a third reactive current or a third reactive power;
s133, determining a fourth active control parameter and a seventh active control mode of the fourth active control parameter of the wind turbine generator during the asymmetric fault according to the voltage, the active power and the reactive power of the wind turbine generator during the asymmetric fault, and determining an eighth active control mode of the fourth active control parameter of the wind turbine generator after the asymmetric fault is eliminated; wherein the fourth active control parameter comprises a fourth active current or a fourth active power;
s134, according to the voltage, the active power and the reactive power of the wind turbine generator in the asymmetric fault, determining a fourth reactive power control parameter of the wind turbine generator in the asymmetric fault period and a seventh reactive power control mode of the fourth reactive power control parameter, and determining an eighth reactive power control mode of the fourth reactive power control parameter after the asymmetric fault of the wind turbine generator is eliminated; wherein the fourth reactive control parameter comprises a fourth reactive current or a fourth reactive power.
Specifically, in step S131, the fifth active control manner is: controlling the third active control parameter to be a preset fifth numerical value;
the sixth active control mode is as follows: controlling the third active control parameter to immediately recover to a third active control parameter initial value, controlling the third active control parameter to rise to the third active control parameter initial value with a preset fifth slope, or controlling the third active control parameter to rise to the third active control parameter initial value with a preset third parabola; and the initial value of the third active control parameter is the value of the third active control parameter before the symmetric fault occurs in the wind turbine generator.
In step S132, the fifth reactive control method is: controlling the third reactive power control parameter according to the minimum voltage value in the positive sequence voltage and the phase voltage of the wind turbine generator, controlling the third reactive power control parameter according to a preset first relation curve or controlling the third reactive power control parameter to be a preset sixth numerical value; the preset first relation curve is a relation curve of the voltage of the wind turbine generator and the third reactive power control parameter;
the sixth reactive power control mode is as follows: controlling the third reactive power control parameter to immediately recover to a third reactive power control parameter initial value, keeping the third reactive power control parameter unchanged within a preset third time, controlling the third reactive power control parameter to descend according to a preset third exponential curve or controlling the third reactive power control parameter to descend according to a preset sixth slope; and the initial value of the third reactive power control parameter is the value of the third reactive power control parameter before the symmetric fault occurs in the wind turbine generator.
It should be noted that, the third reactive power control parameter is controlled according to the minimum voltage value in the positive sequence voltage and the phase voltage of the wind turbine generator, which is specifically represented as: in the positive sequence voltage and the phase voltage of the wind turbine generator, when the positive sequence voltage of the wind turbine generator is smaller than the phase voltage of the wind turbine generator, controlling the third reactive power control parameter according to the positive sequence voltage of the wind turbine generator; and when the positive sequence voltage of the wind turbine generator is greater than the phase voltage of the wind turbine generator, controlling the third reactive power control parameter according to the phase voltage of the wind turbine generator.
In step S133, the seventh active control manner is: controlling the fourth active control parameter to be a preset seventh numerical value or controlling the fourth active control parameter according to the positive sequence voltage of the wind turbine generator;
the eighth active control mode is as follows: controlling the fourth active control parameter to immediately recover to a fourth active control parameter initial value, controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset seventh slope, or controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset fourth parabola; the initial value of the fourth active control parameter is a value of the fourth active control parameter before the asymmetric fault occurs in the wind turbine generator.
In step S134, the seventh reactive control method is: controlling the fourth reactive power control parameter to be zero, controlling the fourth reactive power control parameter to be a preset eighth numerical value, controlling the fourth reactive power control parameter according to a minimum voltage value in a positive sequence voltage and a phase voltage of the wind turbine generator, controlling the fourth reactive power control parameter according to a preset second relation curve or controlling the fourth reactive power control parameter according to a negative sequence voltage of the wind turbine generator; the preset second relation curve is a relation curve of the voltage of the wind turbine generator and the four reactive power control parameters;
the eighth reactive power control mode is as follows: controlling the fourth reactive power control parameter to immediately recover to a fourth reactive power control parameter initial value, keeping the fourth reactive power control parameter unchanged within a preset fourth time, controlling the fourth reactive power control parameter to descend by a preset fifth parabola or controlling the fourth reactive power control parameter to descend by a preset eighth slope; the initial value of the fourth reactive power control parameter is the value of the third reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
In addition, it should be noted that, the execution sequence between steps S131 to S134 is not limited in the embodiment of the present invention; for example, step S134 may be performed first, and then steps S131 to S133 may be performed, which are not described herein again.
In a preferred embodiment, in step S15, the performing simulation verification on the final model specifically includes:
simulating the working parameters based on the final model to obtain an active power simulation value and a reactive power simulation value;
comparing the active power simulation value and the non-active power simulation value with a preset active power standard value and a preset reactive power standard value respectively;
and when the difference value between the active power simulation value and the active power standard value is smaller than a preset first difference value threshold value, and the difference value between the reactive power simulation value and the reactive power standard value is smaller than a preset second difference value threshold value, determining that the simulation verification is passed.
It should be noted that, as shown in fig. 4, a curve 1 is a power simulation curve, a curve 2 is a power standard curve, and the curve 1 is close to the curve 2, which indicates that the power simulation value tends to the power standard value; as shown in fig. 5, curve 3 is a reactive power simulation curve, curve 4 is a reactive power standard curve, and the curve 3 is close to the curve 4, which indicates that the reactive power simulation value tends to the reactive power standard value.
The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator further comprises the following steps:
and when the difference between the active power simulation value and the active power standard value is greater than or equal to a preset first difference threshold, or the difference between the reactive power simulation value and the reactive power standard value is greater than or equal to a preset second difference threshold, returning to execute the step S13.
Referring to fig. 6, another embodiment of the present invention correspondingly provides a device for correcting parameters of a low voltage ride through characteristic model of a wind turbine generator.
The device 1 for correcting the low voltage ride through characteristic model parameters of the wind turbine generator provided by the embodiment of the invention comprises a processor 11, a memory 12 and a computer program which is stored in the memory 12 and configured to be executed by the processor 11, wherein the processor 11 realizes the method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator when executing the computer program.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 12 and executed by the processor 11 to accomplish the present invention. The one or more modules/units may be a series of instruction segments of a computer program capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program in the device 1 for modifying the low voltage ride through characteristic model parameters of the wind turbine generator.
The Processor 11 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 12 may be used to store the computer program and/or the computer module, and the processor 11 implements various functions of the device 1 for modifying the low voltage ride through characteristic model parameter of the wind turbine generator by running or executing the computer program and/or the computer module stored in the memory 12 and calling the data stored in the memory 12. The memory 12 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The module/unit integrated with the correction device 1 for the low voltage ride through characteristic model parameter of the wind turbine generator set can be stored in a computer readable storage medium if the module/unit is implemented in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
To sum up, the embodiment of the present invention provides a method, an apparatus, and a computer-readable storage medium for correcting a model parameter of a low voltage ride through characteristic of a wind turbine generator, wherein an initial model of the low voltage ride through characteristic of the wind turbine generator is established by determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control manner of the first control parameter, then a corresponding second control parameter and a second control manner of the second control parameter are determined according to a working parameter of the wind turbine generator during the voltage drop fault, the initial model parameter is corrected according to the second control parameter and the second control manner to obtain a final model of the low voltage ride through characteristic of the wind turbine generator, and finally the final model is subjected to simulation verification, so as to effectively correct the model parameter of the low voltage ride through characteristic of the wind turbine generator, the final model which is verified through simulation can be applied to monitor the electromechanical transient process of the power system, the electromechanical transient simulation precision of the power system is improved, and therefore safe and stable operation of a power grid is guaranteed.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (8)

1. A method for correcting low voltage ride through characteristic model parameters of a wind turbine generator is characterized by comprising the following steps:
determining a first control parameter of the wind turbine generator after a voltage drop fault occurs and a first control mode of the first control parameter; wherein the voltage sag faults include symmetric faults and asymmetric faults; the first control parameters comprise a first active control parameter of the wind turbine generator during a symmetric fault, a first passive control parameter of the wind turbine generator during the symmetric fault, a second active control parameter of the wind turbine generator during an asymmetric fault and a second reactive control parameter of the wind turbine generator during the asymmetric fault;
establishing an initial model of the low voltage ride through characteristic of the wind turbine generator according to the first control parameter and the first control mode;
acquiring working parameters of the wind turbine generator during the voltage drop fault, and determining corresponding second control parameters and a second control mode of the second control parameters according to the working parameters; the second control parameters comprise a third active control parameter of the wind turbine during a symmetric fault, a third reactive control parameter of the wind turbine during a symmetric fault, a fourth active control parameter of the wind turbine during an asymmetric fault and a fourth reactive control parameter of the wind turbine during an asymmetric fault;
correcting the first control parameter and the first control mode in the initial model according to the second control parameter and the second control mode to obtain a final model of the low voltage ride through characteristic of the wind turbine generator;
performing simulation verification on the final model to monitor an electromechanical transient process of the power system by applying the final model passing the simulation verification;
the method for determining the first control parameter of the wind turbine generator after the voltage drop fault and the first control mode of the first control parameter specifically comprises the following steps:
determining a first active control parameter of the wind turbine generator and a first active control mode of the first active control parameter during the symmetric fault, and determining a second active control mode of the first active control parameter after the symmetric fault of the wind turbine generator is eliminated; wherein the first active control parameter is a first active current or a first active power;
determining a first reactive power control mode of the wind turbine generator and a first reactive power control parameter of the wind turbine generator during the symmetric fault, and determining a second reactive power control mode of the wind turbine generator for the first reactive power control parameter after the symmetric fault is eliminated; wherein, the first reactive control parameter is a first reactive current or a first reactive power;
determining a second active control parameter of the wind turbine generator and a third active control mode of the second active control parameter during the asymmetric fault period, and determining a fourth active control mode of the wind turbine generator on the second active control parameter after the asymmetric fault is eliminated; wherein the second active control parameter is a second active current or a second active power;
determining a second reactive power control parameter of the wind turbine generator during the asymmetric fault and a third reactive power control mode of the second reactive power control parameter, and determining a fourth reactive power control mode of the wind turbine generator for the second reactive power control parameter after the asymmetric fault is eliminated; wherein the second reactive control parameter is a second reactive current or a second reactive power;
when the operating parameters include voltage, active power, and reactive power of the wind turbine during the voltage sag fault;
the determining a corresponding second control parameter and a second control mode for the second control parameter according to the working parameter specifically includes:
according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, determining a third active control parameter of the wind turbine generator during the symmetric fault and a fifth active control mode of the third active control parameter, and determining a sixth active control mode of the wind turbine generator on the third active control parameter after the symmetric fault is eliminated; wherein the third active control parameter comprises a third active current or a third active power;
according to the voltage, the active power and the reactive power of the wind turbine generator during the symmetric fault, determining a third reactive power control parameter of the wind turbine generator during the symmetric fault and a fifth reactive power control mode of the third reactive power control parameter, and determining a sixth reactive power control mode of the wind turbine generator on the third reactive power control parameter after the symmetric fault is eliminated; wherein the third reactive control parameter comprises a third reactive current or a third reactive power;
determining a fourth active control parameter and a seventh active control mode of the fourth active control parameter of the wind turbine generator during the asymmetric fault according to the voltage, the active power and the reactive power of the wind turbine generator during the asymmetric fault, and determining an eighth active control mode of the fourth active control parameter of the wind turbine generator after the asymmetric fault is eliminated; wherein the fourth active control parameter comprises a fourth active current or a fourth active power;
according to the voltage, the active power and the reactive power of the wind turbine generator in the asymmetric fault, determining a fourth reactive power control parameter of the wind turbine generator in the asymmetric fault period and a seventh reactive power control mode of the fourth reactive power control parameter, and determining an eighth reactive power control mode of the wind turbine generator on the fourth reactive power control parameter after the asymmetric fault is eliminated; wherein the fourth reactive control parameter comprises a fourth reactive current or a fourth reactive power.
2. The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator set according to claim 1, wherein the first active control mode is as follows: controlling the first active control parameter to be a preset first numerical value;
the second active control mode is as follows: controlling the first active control parameter to immediately recover to a first active control parameter initial value, controlling the first active control parameter to rise to the first active control parameter initial value with a preset first slope, or controlling the first active control parameter to rise to the first active control parameter initial value with a preset first parabola; the initial value of the first active control parameter is the value of the first active control parameter before the symmetric fault occurs in the wind turbine generator set;
the first reactive power control mode is as follows: controlling the first reactive control parameter according to a first drop voltage, controlling the first reactive control parameter according to a preset first curve or controlling the first reactive control parameter to be a preset second numerical value; wherein the first droop voltage is a voltage of the wind turbine generator during the symmetric fault;
the second reactive power control mode is as follows: controlling the first reactive control parameter to immediately recover to a first reactive control parameter initial value, keeping the first reactive control parameter unchanged within a preset first time, controlling the first reactive control parameter to descend according to a preset first exponential curve or controlling the first reactive control parameter to descend according to a preset second slope; the initial value of the first reactive control parameter is a value of the first reactive control parameter before the symmetric fault occurs in the wind turbine generator.
3. The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator set according to claim 1, wherein the third active control mode is as follows: controlling the second active control parameter to be a preset third numerical value or controlling the second active control parameter according to the positive sequence voltage of the wind turbine generator;
the fourth active control mode is as follows: controlling the second active control parameter to immediately recover to a second active control parameter initial value, controlling the second active control parameter to rise to the second active control parameter initial value with a preset third slope, or controlling the second active control parameter to rise to the second active control parameter initial value with a preset second parabola; the initial value of the second active control parameter is the value of the second active control parameter before the asymmetric fault occurs in the wind turbine generator;
the third reactive power control mode is as follows: controlling the second reactive power control parameter to be zero, controlling the second reactive power control parameter to be a preset fourth numerical value, controlling the second reactive power control parameter according to a second drop voltage, controlling the second reactive power control parameter according to a preset second curve, controlling the second reactive power control parameter according to a negative sequence voltage of the wind turbine generator or controlling the second reactive power control parameter according to a positive sequence voltage and a negative sequence voltage of the wind turbine generator; wherein the second droop voltage is a voltage of the wind turbine generator during the asymmetric fault;
the fourth reactive power control mode is as follows: controlling the second reactive power control parameter to immediately recover to a second reactive power control parameter initial value, keeping the second reactive power control parameter unchanged within a preset second time, controlling the second reactive power control parameter to descend according to a preset second index curve or controlling the second reactive power control parameter to descend according to a preset fourth slope; and the initial value of the second reactive power control parameter is the value of the second reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
4. The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator set according to claim 1, wherein the fifth active control mode is as follows: controlling the third active control parameter to be a preset fifth numerical value;
the sixth active control mode is as follows: controlling the third active control parameter to immediately recover to a third active control parameter initial value, controlling the third active control parameter to rise to the third active control parameter initial value with a preset fifth slope, or controlling the third active control parameter to rise to the third active control parameter initial value with a preset third parabola; the initial value of the third active control parameter is the value of the third active control parameter before the symmetric fault occurs in the wind turbine generator set;
the fifth reactive power control mode is as follows: controlling the third reactive power control parameter according to the minimum voltage value in the positive sequence voltage and the phase voltage of the wind turbine generator, controlling the third reactive power control parameter according to a preset first relation curve or controlling the third reactive power control parameter to be a preset sixth numerical value; the preset first relation curve is a relation curve of the voltage of the wind turbine generator and the third reactive power control parameter;
the sixth reactive power control mode is as follows: controlling the third reactive power control parameter to immediately recover to a third reactive power control parameter initial value, keeping the third reactive power control parameter unchanged within a preset third time, controlling the third reactive power control parameter to descend according to a preset third exponential curve or controlling the third reactive power control parameter to descend according to a preset sixth slope; and the initial value of the third reactive power control parameter is the value of the third reactive power control parameter before the symmetric fault occurs in the wind turbine generator.
5. The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator set according to claim 1, wherein the seventh active control mode is as follows: controlling the fourth active control parameter to be a preset seventh numerical value or controlling the fourth active control parameter according to the positive sequence voltage of the wind turbine generator;
the eighth active control mode is as follows: controlling the fourth active control parameter to immediately recover to a fourth active control parameter initial value, controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset seventh slope, or controlling the fourth active control parameter to increase to the fourth active control parameter initial value with a preset fourth parabola; the initial value of the fourth active control parameter is a value of the fourth active control parameter before the asymmetric fault occurs in the wind turbine generator;
the seventh reactive power control mode is as follows: controlling the fourth reactive power control parameter to be zero, controlling the fourth reactive power control parameter to be a preset eighth numerical value, controlling the fourth reactive power control parameter according to a minimum voltage value in a positive sequence voltage and a phase voltage of the wind turbine generator, controlling the fourth reactive power control parameter according to a preset second relation curve or controlling the fourth reactive power control parameter according to a negative sequence voltage of the wind turbine generator; the preset second relation curve is a relation curve of the voltage of the wind turbine generator and the four reactive power control parameters;
the eighth reactive power control mode is as follows: controlling the fourth reactive power control parameter to immediately recover to a fourth reactive power control parameter initial value, keeping the fourth reactive power control parameter unchanged within a preset fourth time, controlling the fourth reactive power control parameter to descend by a preset fifth parabola or controlling the fourth reactive power control parameter to descend by a preset eighth slope; the initial value of the fourth reactive power control parameter is the value of the third reactive power control parameter before the asymmetric fault occurs in the wind turbine generator.
6. The method for correcting the low voltage ride through characteristic model parameters of the wind turbine generator set according to any one of claims 1 to 3, wherein the simulation verification of the final model specifically comprises:
simulating the working parameters based on the final model to obtain an active power simulation value and a reactive power simulation value;
comparing the active power simulation value and the reactive power simulation value with a preset active power standard value and a preset reactive power standard value respectively;
and when the difference value between the active power simulation value and the active power standard value is smaller than a preset first difference value threshold value, and the difference value between the reactive power simulation value and the reactive power standard value is smaller than a preset second difference value threshold value, determining that the simulation verification is passed.
7. A wind turbine generator low voltage ride through characteristic model parameter correction device, characterized by comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the wind turbine generator low voltage ride through characteristic model parameter correction method according to any one of claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored computer program, wherein when the computer program runs, the computer-readable storage medium is controlled to execute the method for modifying the low voltage ride through characteristic model parameters of the wind turbine generator according to any one of claims 1 to 6.
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