CN110138015B - Fan high voltage ride through control method and device - Google Patents
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Abstract
The invention provides a fan high voltage ride through control method and a device, which detect the voltage of a power grid in real time, determine the reactive power target value regulated by a fan according to the voltage variation of the power grid before and after the power grid enters a high voltage state after confirming that the power grid enters the high voltage state, determine the reactive power boundary value of the fan according to the rated active power, the rated capacity and the like of the fan, and perform feedforward control on the fan according to the determined reactive power target value and boundary value to realize the accurate regulation of the fan, so that the fan can resist the voltage fluctuation of the power grid; meanwhile, the quick response of the reactive power can be ensured, the capacity of the converter is fully utilized, a power loop does not need to be switched out, a switching controller is avoided, and the high voltage ride through capability of the fan is improved.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a method and a device for controlling high voltage ride through of a fan.
Background
In recent years, with the application of High-Voltage direct-current transmission, the grid safety puts forward higher requirements on the High Voltage Ride Through (HVRT) of a wind turbine generator, a complete set of standards suitable for the condition of the power grid in China is gradually formed, and the standard of the High Voltage Ride Through is quickly changed into a mandatory requirement and is gradually popularized; the stator side of the doubly-fed wind generator is connected with a power grid, and because the doubly-fed wind generator is designed, the rotor voltage is generally far lower than the stator voltage in rated operation, so that the problem of overshoot of a frequency converter is caused by the rise of the power grid voltage; in the process of increasing the voltage of the power grid, capacitive reactive power is generated under the condition that a fan needs to keep active work so as to reduce the voltage of the power grid and improve the fault ride-through capability, different manufacturers are different in reactive power generation amount, but most of the reactive power generation amount is increased by a fixed reactive power amount, and the reactive power amount cannot be accurately given according to the voltage variation amount.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a method and an apparatus for controlling high voltage ride through of a wind turbine, so as to improve the above-mentioned problems.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a fan high voltage ride through control method, which comprises the following steps: when the power grid is confirmed to enter a high-voltage state, determining the power grid voltage variation delta U before and after the power grid enters the high-voltage state; determining a reactive power target value of the fan according to the voltage variation delta U; and adjusting and controlling the fan according to the reactive power boundary value of the fan stator and the determined reactive power target value.
Further, the voltage variation Δ U and the reactive power target value of the fan satisfy the following equation: qset ═ K × Δ U; the Qset refers to a reactive power target value of the fan stator, the delta U refers to a power grid voltage variation before and after the power grid enters a high-voltage state, and the K is a predetermined voltage-power parameter.
Further, before the regulation control is performed on the fan according to the determined target value of reactive power, the fan high voltage ride through control method includes: determining a reactive power boundary value of the fan stator according to the rated active power of the fan stator, wherein the boundary value refers to the maximum value of the reactive power, and the rated active power and the reactive power satisfy the following equation: (Q-Qmeg)2+Pn2＝Sn2And Q refers to the reactive power of the fan stator, Qmeg refers to the stator excitation reactive power of the fan, Pn is the rated active power of the fan, and Sn refers to the rated capacity of the fan stator.
Further, the step of adjusting and controlling the fan according to the reactive power boundary value of the fan stator and the determined reactive power target value comprises: inputting the reactive power target value and the reactive power boundary value into a power loop proportional integral controller to determine the rotor reactive current; inputting the determined rotor reactive current into a current loop proportional-integral controller to determine a rotor voltage; and adjusting the rotor of the fan according to the determined rotor voltage.
Further, the fan high voltage ride through control method comprises the following steps: detecting the voltage of a power grid in real time; and when the detected power grid voltage is greater than a preset voltage, determining that the power grid enters a high-voltage state.
Further, the preset voltage is 1.1 times of the reference voltage of the power grid.
The invention also provides a fan high voltage ride through control device, which is used for the fan high voltage ride through method, and comprises the following steps: the processing unit is used for determining a reactive power target value of the fan according to the variation delta U of the grid voltage before and after the grid voltage enters the high-voltage state when the grid is confirmed to enter the high-voltage state; and the control unit is used for adjusting and controlling the fan according to the reactive power boundary value of the fan stator and the determined reactive power target value.
Further, the fan high voltage ride through control device includes: the data acquisition unit is used for detecting and acquiring the voltage of the power grid in real time; the processing unit is further used for determining that the power grid enters a high-voltage state when the obtained power grid voltage is higher than a preset voltage.
Compared with the prior art, the invention has the following beneficial effects:
according to the method and the device for controlling the high voltage ride through of the fan, the voltage of the power grid is detected in real time, after the power grid is confirmed to enter a high voltage state, the reactive power target value of the fan is determined according to the voltage variation of the power grid before and after the power grid enters the high voltage state, meanwhile, the reactive power boundary value of the fan is determined according to the rated active power, the rated capacity and the like of the fan, the fan is subjected to feedforward control according to the determined reactive power target value and boundary value, the accurate adjustment of the fan is realized, and the fan can resist the voltage fluctuation of the power grid; meanwhile, the quick response of the reactive power can be ensured, the capacity of the converter is fully utilized, a power loop does not need to be switched out, a switching controller is avoided, and the high voltage ride through capability of the fan is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flow chart diagram illustrating a method for controlling high voltage ride through of a wind turbine according to the present invention.
Fig. 2 shows a schematic diagram of the active and reactive power of a wind turbine.
Fig. 3 shows a control block diagram for controlling the fan according to the present embodiment.
Fig. 4 shows a schematic diagram of a high voltage ride through control device of a wind turbine according to the present invention.
Icon: 200-a fan high voltage ride through control device; 210-a data acquisition unit; 220-a processing unit; 230-control unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
First embodiment
The embodiment provides a high voltage ride through control method for a fan, so as to ensure that the fan can normally operate in a high voltage ride through state. Referring to fig. 1, fig. 1 shows a flowchart of a fan high voltage ride through control method provided in this embodiment.
The fan high voltage ride through control method comprises the following steps: S1-S6.
And S1, detecting the power grid voltage in real time.
The stator winding of the doubly-fed wind generator is directly connected with a power grid, the rotor winding is connected with the power grid through a converter, the frequency, the voltage, the amplitude and the phase of a rotor winding power supply are automatically adjusted by a frequency converter according to the operation requirement, and the unit can realize constant-frequency power generation at different rotating speeds, so that the requirements of power utilization loads and grid connection are met. Because of the AC excitation, the generator and the power system form flexible connection, namely, the excitation current can be adjusted according to the voltage and the current of the power grid and the rotating speed of the generator, and the output current of the generator can be accurately adjusted to meet the requirements. The doubly-fed wind driven generator has the advantages that the stator and the rotor can exchange power with a power grid, the voltage of the rotor is generally far lower than that of the stator when the doubly-fed wind driven generator runs in a rated mode due to the design of the doubly-fed wind driven generator, and therefore the problem of overshoot of a frequency converter is caused by the rise of the voltage of the power grid.
And S2, determining whether the power grid enters a high voltage state.
And when the detected power grid voltage is greater than the preset voltage, determining that the power grid enters a high-voltage state, namely, high-voltage ride-through control is required to be performed on the fan. Generally, it is determined whether the power grid enters a high voltage state, that is, whether the power grid voltage is greater than a preset voltage, in this embodiment, the preset voltage is 1.1 times of the reference voltage of the power grid. If the power grid enters a high-voltage state, high-voltage ride through control is required to be performed on the fan, and S3 is executed; if the grid does not enter the high voltage state, S1 is executed to continue to detect the grid voltage.
And S3, when the power grid is confirmed to enter the high-voltage state, determining the power grid voltage variation delta U before and after the power grid enters the high-voltage state.
The method is also known by various fan manufacturers at present, but different manufacturers are different for reactive power generation amount, most of the reactive power generation amount corresponds to a certain fixed reactive amount according to the rising amplitude of voltage, the amplitude of voltage can be reduced after reactive power compensation, no foreknowledge is provided, and the capacity of a converter cannot be fully utilized. In this embodiment, the reactive power output is measured in advance according to the voltage variation before and after the grid enters the high voltage state. The voltage of the power grid after entering a high-voltage state is measured to be URear endThe voltage of the power grid before entering the high-voltage state is UFront sideIf the grid voltage variation Δ U satisfies the following equation: Δ U ═ URear end-UFront side。
And S4, determining the reactive power target value of the fan according to the voltage change delta U.
In this embodiment, the reactive power output is measured in advance according to the voltage variation Δ U before and after the grid enters the high voltage state. The voltage variation delta U and the reactive power target value of the fan meet the following formula: qsetK · Δ U. Wherein Q issetThe method is characterized in that a reactive power target value of a fan stator is indicated, delta U is the voltage variation of a power grid before and after the power grid enters a high-voltage state, and K is a predetermined voltage-power parameter.
Before the reactive power target value is measured and calculated, a voltage-power parameter K needs to be determined. For example, assuming that the voltage of the common grid-connected point of the wind farm remains unchanged, for the variation Δ U of the voltage of the grid-connected point of a single fan, under the same active power, the reactive variation Δ Q of the fan satisfies the following equation: Δ Q ═ U/X × Δ U. Wherein U is the voltage of the public grid-connected point, and X is the equivalent reactance from the public grid-connected point to the fan grid-connected point. Defining a voltage-power parameter K:
k is U/X is delta Q/delta U. A curve fitting method is utilized, a plurality of points are taken from the working parameters of the fan, corresponding delta U1, delta U2, delta U3 and delta U4 … delta Un are recorded under different delta Q1, delta Q2, delta Q3 and delta Q4 … delta Qn, and K1, K2, K3 and K4 … Kn are calculated by using a formula K-U/X-delta Q/delta U. Then averaging the obtained K1, K2, K3 and K4 … Kn to obtain: k ═ K (K1+ K2+ K3+ K4+ … Kn)/n.
When the power grid enters a high-voltage state, a reactive power target value Q can be determined according to the variation delta U of the power grid voltage before and after the power grid enters the high-voltage state and a predetermined voltage-power parameter Kset. According to the predetermined voltage-power parameter K, the reactive power target value of the fan is determined according to the voltage variation of the power grid before and after the power grid enters the high-voltage state, and the reactive compensation amount required by the voltage variation is accurately predicted, namely, the amplitude of the voltage which can be reduced after reactive compensation can be determined, so that compared with the fixed reactive compensation amount in the prior art, more accurate adjustment and control can be achieved.
And S5, determining a reactive power boundary value of the fan stator according to the rated active power of the fan stator.
In this embodiment, the boundary value of the reactive power of the stator refers to the maximum value of the reactive power of the stator, i.e. the maximum reactive power that the stator can emit. The active power and the reactive power satisfy the following equation: (Q-Q)meg)2+Pn2＝Sn2Referring to fig. 2, the shaded area in fig. 2 is the active and reactive power area, wherein Q denotes the (capacitive) reactive power of the wind turbine stator, QmegThe stator excitation reactive power of the fan is indicated, Pn is the active power of the fan, and Sn is the rated capacity of the fan stator. For the fan, the stator excitation reactive QmegThe rated capacity Sn and the rated active power of the stator of the fan are all fixed parameters, so that the active power Pn of the fan is constantIn the case (for example, Pn is the rated active power of the stator of the wind turbine), the maximum reactive power threshold Q corresponding to the active power, that is, the reactive power boundary value of the wind turbine, may be determined. The method comprises the steps of considering excitation reactive power of a doubly-fed generator, determining an active boundary range and a reactive boundary range of a stator side, obtaining maximum capacitive reactive power which can be correspondingly sent under certain active power according to the range, namely determining a boundary value of the stator side reactive power under rated active power, determining a reactive power target value of a fan and the determined reactive power boundary value of the stator through voltage variation, and accurately controlling the fan to effectively complete high voltage ride through.
It should be noted that in this embodiment, S4 and S5 have no logical precedence relationship, and they can be performed simultaneously.
And S6, adjusting and controlling the fan according to the reactive power boundary value of the fan stator and the determined reactive power target value.
In this embodiment, the control strategy is accomplished by a rotor-side converter through a feed-forward control of the reactive power loop plus reactive power given to the reactive current loop. Referring to fig. 3, fig. 3 shows a control block diagram of the regulation control of the wind turbine according to the determined reactive power target value and the reactive power boundary value.
First, the reactive power target value and the reactive power boundary value are input into a power loop proportional integral controller to determine the rotor reactive current. In the power proportional integral controller, the reactive feedforward coefficient is Un/(3 × E × Uo), where Un represents the rated voltage on the fan stator side, E represents the actual phase voltage on the stator side, and Uo represents the rotor opening voltage. E/Xm is rotor exciting current, wherein Xm represents generator (fan) mutual inductance. The feedback of the power loop proportional integral controller adopts net reactive feedback, and the net reactive can be measured in real time in the running engineering of the fan. The output result of the power loop proportional integral controller is rotor reactive current.
And inputting the determined rotor reactive current into a current loop proportional integral controller to determine the rotor voltage.
The output of the power conversion proportional-integral controller, namely the rotor current, is input to the current loop proportional-integral controller, and the current loop proportional-integral controller outputs the rotor voltage. In this embodiment, the feedback of the current loop proportional-integral controller adopts rotor reactive current feedback, and the rotor reactive current can be measured in real time in the running process of the fan. And after the rotor voltage is determined, adjusting the rotor of the fan according to the determined rotor voltage so that the fan outputs a specific voltage amplitude to the power grid to resist the fluctuation of the power grid voltage.
Second embodiment
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a high voltage ride through control apparatus 200 for a wind turbine according to a preferred embodiment of the present invention. It should be noted that the basic principle and the generated technical effect of the fan high voltage ride through control device 200 provided in the present embodiment are substantially the same as those of the fan high voltage ride through control method provided in the foregoing embodiment, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the foregoing embodiment.
Referring to fig. 4, the wind turbine high voltage ride through control apparatus 200 includes: a data acquisition unit 210, a processing unit 220 and a control unit 230.
The data obtaining unit 210 is configured to detect and obtain a grid voltage in real time. Due to the design of the doubly-fed wind generator, the rotor voltage is generally far lower than the stator voltage in rated operation, so that the problem of overshoot of a frequency converter is caused by the rise of the grid voltage.
It is to be appreciated that in a preferred embodiment, the data acquisition unit 210 may be configured to perform S1.
And the processing unit 220 is configured to determine that the power grid enters a high-voltage state when the acquired power grid voltage is higher than a preset voltage.
And when the detected power grid voltage is greater than the preset voltage, determining that the power grid enters a high-voltage state, namely, high-voltage ride-through control is required to be performed on the fan. Generally, it is determined whether the power grid enters a high voltage state, that is, whether the power grid voltage is greater than a preset voltage, in this embodiment, the preset voltage is 1.1 times of the reference voltage of the power grid. If the power grid enters a high-voltage state, high-voltage ride through control needs to be carried out on the fan, and if the power grid does not enter the high-voltage state, the voltage of the power grid is continuously detected.
It is to be appreciated that in a preferred embodiment, the processing unit 220 may be configured to perform S2.
And the processing unit 220 is further configured to, when it is determined that the grid enters the high-voltage state, determine a reactive power target value of the fan according to the variation Δ U of the grid voltage before and after entering the high-voltage state, and determine a reactive power boundary value of the fan stator according to the rated active power of the fan stator.
In this embodiment, the reactive power output is measured in advance according to the voltage variation before and after the grid enters the high voltage state. The voltage of the power grid after entering a high-voltage state is measured to be URear endThe voltage of the power grid before entering the high-voltage state is UFront sideIf the grid voltage variation Δ U satisfies the following equation: Δ U ═ URear end-UFront side。
And measuring and calculating the reactive power output in advance according to the voltage change delta U before and after the power grid enters a high-voltage state. The voltage variation delta U and the reactive power target value of the fan meet the following formula: qsetK · Δ U. Wherein Q issetThe method is characterized in that a reactive power target value of a fan stator is indicated, delta U is the voltage variation of a power grid before and after the power grid enters a high-voltage state, and K is a predetermined voltage-power parameter.
The boundary value of the reactive power of the stator is the maximum value of the reactive power of the stator, i.e. the maximum reactive power that can be emitted by the stator. Wherein, rated active power and reactive power satisfy the following formula: (Q-Q)meg)2+Pn2＝Sn2Wherein Q denotes the reactive power of the fan stator, QmegThe stator excitation reactive power of the fan is indicated, Pn is the active power of the fan, and Sn is the rated capacity of the fan stator. For the fan, the stator excitation reactive QmegThe rated capacity Sn and the rated active power of the fan stator are fixed parameters, so that when the active power Pn of the fan is certain (for example, P is the rated active power of the fan stator), the determination can be carried outAnd a maximum reactive power threshold Q corresponding to the active power, namely a reactive power boundary value of the fan. The method comprises the steps of considering excitation reactive power of a doubly-fed generator, determining a boundary range of active power and reactive power of a stator side, obtaining maximum capacitive reactive power which can be correspondingly sent under certain active power according to the boundary range, namely determining a boundary value of reactive power of the stator side, determining a reactive power target value of a fan and the determined boundary value of the reactive power of the stator through voltage variation, and accurately controlling the fan to effectively complete high voltage ride through.
It is to be appreciated that in a preferred embodiment, the processing unit 220 may be configured to perform S3-S5.
And the control unit 230 is configured to perform adjustment control on the wind turbine according to the reactive power boundary value of the wind turbine stator and the determined reactive power target value.
In this embodiment, the control strategy is accomplished by a rotor-side converter through a feed-forward control of the reactive power loop plus reactive power given to the reactive current loop. Referring to fig. 3, fig. 3 shows a control block diagram of the regulation control of the wind turbine according to the determined reactive power target value and the reactive power boundary value.
First, the reactive power target value and the reactive power boundary value are input into a power loop proportional integral controller to determine the rotor reactive current. In the power proportional integral controller, the reactive feedforward coefficient is Un/(3 × E × Uo), where Un represents the rated voltage on the fan stator side, E represents the actual phase voltage on the stator side, and Uo represents the rotor opening voltage. E/Xm is rotor exciting current, wherein Xm represents generator (fan) mutual inductance. The feedback of the power loop proportional integral controller adopts net reactive feedback, and the net reactive can be measured in real time in the running engineering of the fan. The output result of the power loop proportional integral controller is rotor reactive current.
And inputting the determined rotor reactive current into a current loop proportional integral controller to determine the rotor voltage. The output of the power conversion proportional-integral controller, namely the rotor current, is input to the current loop proportional-integral controller, and the current loop proportional-integral controller outputs the rotor voltage. In this embodiment, the feedback of the current loop proportional-integral controller adopts rotor reactive current feedback, and the rotor reactive current can be measured in real time in the running process of the fan. And after the rotor voltage is determined, adjusting the rotor of the fan according to the determined rotor voltage so that the fan outputs a specific voltage amplitude to the power grid to resist the fluctuation of the power grid voltage.
It is to be understood that in a preferred embodiment, the control unit 230 may be configured to perform S6.
In summary, the invention provides a method and a device for controlling high voltage ride through of a fan, which detect the voltage of a power grid in real time, determine a reactive power target value regulated by the fan according to the voltage variation of the power grid before and after the power grid enters a high voltage state after confirming that the power grid enters the high voltage state, determine a reactive power boundary value of the fan according to the rated active power, the rated capacity and the like of the fan, and perform feedforward control on the fan according to the determined reactive power target value and boundary value, so as to realize accurate regulation of the fan and enable the fan to resist the voltage fluctuation of the power grid; meanwhile, the quick response of the reactive power can be ensured, the capacity of the converter is fully utilized, a power loop does not need to be switched out, a switching controller is avoided, and the high voltage ride through capability of the fan is improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A fan high voltage ride through control method is characterized by comprising the following steps:
when the power grid is confirmed to enter a high-voltage state, determining the power grid voltage variation delta U before and after the power grid enters the high-voltage state;
determining a reactive power target value of the fan according to the voltage variation delta U; the voltage variation delta U and the reactive power target value of the fan meet the following formula:
Qset＝K*ΔU；
the Qset refers to a reactive power target value of the fan stator, the delta U refers to a power grid voltage variation before and after the power grid enters a high-voltage state, and the K is a predetermined voltage-power parameter;
determining a reactive power boundary value of the fan stator according to the rated active power of the fan stator, wherein the boundary value refers to the maximum value of the reactive power, and the rated active power and the reactive power satisfy the following equation:
(Q-Qmeg)2+Pn2＝Sn2，
q refers to the reactive power of the fan stator, Qmeg refers to the stator excitation reactive power of the fan, Pn refers to the rated active power of the fan, and Sn refers to the rated capacity of the fan stator;
and adjusting and controlling the fan according to the reactive power boundary value of the stator and the reactive power target value.
2. The wind turbine high voltage ride-through control method according to claim 1, wherein the step of regulating and controlling the wind turbine according to the reactive power boundary value of the wind turbine stator and the determined reactive power target value comprises:
inputting the reactive power target value and the reactive power boundary value into a power loop proportional integral controller to determine the rotor reactive current;
inputting the rotor reactive current into a current loop proportional-integral controller to determine rotor voltage;
and adjusting the rotor of the fan according to the rotor voltage.
3. The fan high voltage ride through control method of claim 1, comprising:
detecting the voltage of a power grid in real time;
and when the detected power grid voltage is greater than a preset voltage, determining that the power grid enters a high-voltage state.
4. The wind turbine high voltage ride through control method of claim 3, wherein the preset voltage is 1.1 times a reference voltage of the grid.
5. A fan high voltage ride through control device, characterized in that the fan high voltage ride through control device is used for executing the fan high voltage ride through method of any one of claims 1 to 4, and the fan high voltage ride through control device comprises:
the processing unit is used for determining a reactive power target value of the fan according to the variation delta U of the grid voltage before and after the grid voltage enters the high-voltage state when the grid is confirmed to enter the high-voltage state; the voltage variation delta U and the reactive power target value of the fan meet the following formula:
Qset＝K*ΔU；
the Qset refers to a reactive power target value of the fan stator, the delta U refers to a power grid voltage variation before and after the power grid enters a high-voltage state, and the K is a predetermined voltage-power parameter;
the processing unit is further configured to determine a boundary value of reactive power of the wind turbine stator according to a rated active power of the wind turbine stator, where the boundary value refers to a maximum value of the reactive power, and the rated active power and the reactive power satisfy the following equation:
(Q-Qmeg)2+Pn2＝Sn2，
q refers to the reactive power of the fan stator, Qmeg refers to the stator excitation reactive power of the fan, Pn refers to the rated active power of the fan, and Sn refers to the rated capacity of the fan stator;
and the control unit is used for adjusting and controlling the fan according to the reactive power boundary value of the fan stator and the determined reactive power target value.
6. The wind turbine high voltage ride through control device of claim 5, wherein the wind turbine high voltage ride through control device comprises:
the data acquisition unit is used for detecting and acquiring the voltage of the power grid in real time;
the processing unit is further used for determining that the power grid enters a high-voltage state when the obtained power grid voltage is higher than a preset voltage.
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| CN102355009A (en) * | 2011-10-11 | 2012-02-15 | 国电联合动力技术有限公司 | Method by utilizing doubly-fed generator to realize high-voltage ride through of wind power generating set and system thereof |
| CN104362667A (en) * | 2014-10-16 | 2015-02-18 | 中国人民解放军装甲兵工程学院 | Cooperative control method of high and low voltage ride-through for doubly-fed wind turbine set |
| CN107026472A (en) * | 2017-04-27 | 2017-08-08 | 天津瑞能电气有限公司 | A kind of double-fed frequency converter high voltage crossing pusher side control method |
| CN109066766A (en) * | 2018-07-06 | 2018-12-21 | 南京理工大学 | A kind of wind farm grid-connected high voltage crossing control method |
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| KR20140081057A (en) * | 2012-12-21 | 2014-07-01 | 대우조선해양 주식회사 | Method for controlling reactive power of offshore wind power generator in high voltage ride through of the power grid |
| CN104113077B (en) * | 2014-06-30 | 2016-01-20 | 浙江大学 | A kind of control method for coordinating of dual-feed asynchronous wind power generator high voltage crossing |
| CN109193819A (en) * | 2018-09-05 | 2019-01-11 | 中国电力科学研究院有限公司 | A kind of wind power plant reactive voltage hierarchical control method and system |
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| CN102355009A (en) * | 2011-10-11 | 2012-02-15 | 国电联合动力技术有限公司 | Method by utilizing doubly-fed generator to realize high-voltage ride through of wind power generating set and system thereof |
| CN104362667A (en) * | 2014-10-16 | 2015-02-18 | 中国人民解放军装甲兵工程学院 | Cooperative control method of high and low voltage ride-through for doubly-fed wind turbine set |
| CN107026472A (en) * | 2017-04-27 | 2017-08-08 | 天津瑞能电气有限公司 | A kind of double-fed frequency converter high voltage crossing pusher side control method |
| CN109066766A (en) * | 2018-07-06 | 2018-12-21 | 南京理工大学 | A kind of wind farm grid-connected high voltage crossing control method |
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